diff --git a/Laptop/lidar/Lidar.py b/Laptop/lidar/Lidar.py
new file mode 100644
index 0000000000000000000000000000000000000000..42a434010cc385ed0ac8168dd130b6ef68a727c4
--- /dev/null
+++ b/Laptop/lidar/Lidar.py
@@ -0,0 +1,34 @@
+import socket
+import time
+#import matplotlib.pyplot as plt
+
+TCP_IP = '169.254.13.125'
+TCP_PORT = 2111
+BUFFER_SIZE = 10240
+
+#start
+#MESSAGE = "\x02sMN\x20LMCstartmeas\x03"
+
+MESSAGE = "\x02sRN\x20LMDscandata\x03"
+
+s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+s.connect((TCP_IP, TCP_PORT))
+
+for x in range(1,500):
+ s.send(MESSAGE)
+ #print "4"
+ data = s.recv(BUFFER_SIZE)
+ #print data.split(' 21D ')[1].split(' ')
+ try:
+ decdata = map(lambda x: int(x,16), data.split(' 21D ')[1].split(' ')[0:-1])
+ except :
+ print ('some error\n')
+ if len(decdata) == 546 :
+ print x, "recvd:", decdata[0:545:30]
+ else:
+ print x, 'len: ', len(decdata)
+ #plt.plot(data)
+ #plt.show()
+ time.sleep(0.05)
+s.close()
+
diff --git a/Laptop/lidar/aniPlot.py b/Laptop/lidar/aniPlot.py
new file mode 100644
index 0000000000000000000000000000000000000000..90da7c45817cd874305c179a7ae8a563f6605cad
--- /dev/null
+++ b/Laptop/lidar/aniPlot.py
@@ -0,0 +1,24 @@
+import matplotlib.pyplot as plt
+import numpy as np
+import matplotlib.animation as animation
+
+def main():
+ numframes = 100
+ numpoints = 3
+ color_data = np.random.random((numframes, numpoints))
+ x, y, c = np.random.random((3, numpoints))
+
+ fig = plt.figure()
+ scat = plt.scatter(x, y, c=c, s=100)
+
+ ani = animation.FuncAnimation(fig, update_plot, frames=xrange(numframes),
+ fargs=(color_data, scat))
+ plt.show()
+
+def update_plot(i, data, scat):
+ print 'i:', i, ', data:', data[i]
+ scat.set_offsets((data[i]))
+ print data[i].shape
+ return scat,
+
+main()
\ No newline at end of file
diff --git a/Laptop/lidar/lidarPlot_simple.py b/Laptop/lidar/lidarPlot_simple.py
new file mode 100644
index 0000000000000000000000000000000000000000..28b757e3ed8262446d4dd6d0041bacd421bb8cd7
--- /dev/null
+++ b/Laptop/lidar/lidarPlot_simple.py
@@ -0,0 +1,84 @@
+import matplotlib.pyplot as plt
+import numpy as np
+import matplotlib.animation as animation
+import math
+
+
+def update_plot(k, scat, degsPerP):
+ #scat.set_array(data[i])
+ #print 'K: ', k
+ myDistances = [20,21,2,3,4,5,6,7,8,9,2, 2,3]
+ xData = [0 for i in range(len(myDistances))]
+ yData = [0 for i in range(len(myDistances))]
+ # generate x and y coordinates from distances
+ for i in range(0,len(myDistances)):
+ xData[i] = myDistances[i] * math.cos(math.radians(180+45-i*degsPerP))
+ yData[i] = myDistances[i] * math.sin(math.radians(180+45-i*degsPerP))
+ print np.swapaxes(np.asarray((xData,yData)),0,1).shape
+ scat.set_offsets(np.swapaxes(np.asarray((xData,yData)),0,1))
+
+ return scat
+
+
+def main():
+ myDistances = [10,11,12,13,14,15,16,17,18,19,20, 22, 23]
+
+ degsPerP = 270.0/(len(myDistances)-1)
+ print 'degs per P: ', degsPerP
+
+ scannerPosx = 0
+ scannerPosy = 0
+
+ xData = [0 for i in range(len(myDistances))]
+ yData = [0 for i in range(len(myDistances))]
+ # generate x and y coordinates from distances
+ for i in range(0,len(myDistances)):
+ xData[i] = myDistances[i] * math.cos(math.radians(-45+i*degsPerP))
+ yData[i] = myDistances[i] * math.sin(math.radians(-45+i*degsPerP))
+ #print 'i:',i, 'd:',myDistances[i], ', x:', xData[i], ', y:', yData[i]
+
+ xData = [0]+xData # add cross in origin
+ yData = [0]+yData
+ fig = plt.figure()
+ scat = plt.scatter(xData,yData, s=20, marker='x')
+ plt.xlim(-25, 25)
+ plt.ylim(-25, 25)
+ #print len(yData)
+
+ ani = animation.FuncAnimation(fig, update_plot, frames=xrange(5), fargs=(scat, degsPerP))
+ plt.show()
+
+main()
+
+'''
+xDatap1 = [1,2,3,4,5]
+yDatap1 = [0.1,0.1,0.1,0.1,0.1]
+
+xDatap2 = [9,9,9,9,9]
+yDatap2 = [9,8,7,6,5]
+
+xDatap3 = [0.1,0.2,0.3,0.4,0.5]
+yDatap3 = [0.9,0.7,0.6,0.4,0.5]
+
+pos_data = np.random.random((5, 3, 2))
+
+for i in range(0, 5):
+ #pos_data[i] = [[xDatap1[i], xDatap2[i], xDatap3[i]], [yDatap1[i],yDatap2[i],yDatap3[i]]]
+ pos_data[i] = [[xDatap1[i],yDatap1[i]],[xDatap2[i],yDatap2[i]],[xDatap3[i],yDatap3[i]]]
+
+numframes = 5
+numpoints = 3
+#pos_data = np.random.random((numframes, numpoints, 2))
+#pos_data = (numframes,2,2)
+x, y, c = np.random.random((3, numpoints))
+
+fig = plt.figure()
+scat = plt.scatter([xDatap1[0],xDatap2[0], xDatap3[0]],
+ [yDatap1[0],yDatap2[0], yDatap3[0]], c=c, s=100, marker='x')
+plt.xlim(0, 15)
+plt.ylim(0, 10)
+
+ani = animation.FuncAnimation(fig, update_plot, frames=xrange(5),
+ fargs=(pos_data, scat))
+plt.show()
+'''
\ No newline at end of file
diff --git a/Laptop/lidar/plotLidar.py b/Laptop/lidar/plotLidar.py
new file mode 100644
index 0000000000000000000000000000000000000000..38620e66db2e62b6f8fd8e959a7c817f8d8a31c4
--- /dev/null
+++ b/Laptop/lidar/plotLidar.py
@@ -0,0 +1,101 @@
+import matplotlib.pyplot as plt
+import numpy as np
+import matplotlib.animation as animation
+import math
+import socket
+import time
+
+TCP_IP = '10.180.65.30' #'169.254.13.125'
+TCP_PORT = 2111
+BUFFER_SIZE = 10240
+MESSAGE = "\x02sRN LMDscandata\x03"
+
+xData = [0 for i in range(0,541)]
+yData = [0 for i in range(0,541)]
+degsPerP = 270.0/(541-1)
+
+def update_plot(k, scat, s):
+
+ s.send(MESSAGE)
+ data = s.recv(BUFFER_SIZE)
+ try:
+ decdata = map(lambda x: int(x,16), data.split(' 21D ')[1].split(' ')[0:-1])[0:-5]
+ if len(decdata) != 541 :
+ print 'len: ', len(decdata)
+ degsPerP = 270.0/(len(myDistances)-1)
+ # generate x and y coordinates from distances
+ for i in range(0,len(myDistances)):
+ xData[i] = myDistances[i] * math.cos(math.radians(-45+i*degsPerP))
+ yData[i] = myDistances[i] * math.sin(math.radians(-45+i*degsPerP))
+ #print np.swapaxes(np.asarray((xData,yData)),0,1).shape
+ scat.set_offsets(np.swapaxes(np.asarray((xData,yData)),1,0))
+
+ return scat
+
+ else:
+ #print 'OK!'
+ myDistances = decdata
+ degsPerP = 0.5 #
+
+ # generate x and y coordinates from distances
+ for i in range(0,len(myDistances)):
+ xData[i] = myDistances[i] * math.cos(math.radians(-45+i*degsPerP))
+ yData[i] = myDistances[i] * math.sin(math.radians(-45+i*degsPerP))
+ #print np.swapaxes(np.asarray((xData,yData)),0,1).shape
+ scat.set_offsets(np.swapaxes(np.asarray((xData,yData)),1,0))
+
+ return scat
+ except :
+ print ('some error\n')
+ return scat
+
+
+
+
+def main():
+
+
+ plot_type = "blit"
+
+ s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+ s.connect((TCP_IP, TCP_PORT))
+
+ myDistances = [10,11,12,13,14,15,16,17,18,19,20, 22, 23]
+
+ #degsPerP = 270.0/(len(myDistances)-1)
+ print 'degs per P: ', degsPerP
+
+ scannerPosx = 0
+ scannerPosy = 0
+
+ xData = [0 for i in range(len(myDistances))]
+ yData = [0 for i in range(len(myDistances))]
+ # generate x and y coordinates from distances
+ for i in range(0,len(myDistances)):
+ xData[i] = myDistances[i] * math.cos(math.radians(180+45-i*degsPerP))
+ yData[i] = myDistances[i] * math.sin(math.radians(180+45-i*degsPerP))
+ #print 'i:',i, 'd:',myDistances[i], ', x:', xData[i], ', y:', yData[i]
+
+ xData = [0]+xData # add cross in origin
+ yData = [0]+yData
+ fig = plt.figure()
+ scat = plt.scatter(xData,yData, s=0.5, marker='x')
+ plt.xlim(-20000, 20000)
+ plt.ylim(-10000, 20000)
+ fig.gca().set_aspect('equal', adjustable='box')
+ #print len(yData)
+
+ ani = animation.FuncAnimation(fig, update_plot, interval=20, frames=xrange(2), fargs=(scat, s))
+ plt.show()
+ s.close()
+
+main()
+
+
+
+#import matplotlib.pyplot as plt
+
+
+
+#start
+#MES
diff --git a/Laptop/lidar/plotterFRRelayer.py b/Laptop/lidar/plotterFRRelayer.py
new file mode 100644
index 0000000000000000000000000000000000000000..ebaef1d44a63ad24f8e069b825b5375d7de54bde
--- /dev/null
+++ b/Laptop/lidar/plotterFRRelayer.py
@@ -0,0 +1,134 @@
+import matplotlib.pyplot as plt
+import numpy as np
+import matplotlib.animation as animation
+import math
+import socket
+import time
+
+TCP_IP = '10.9.0.3' #'169.254.13.125'
+TCP_PORT = 2110
+BUFFER_SIZE = 10240
+
+xData = [0 for i in range(0,541+5)]
+yData = [0 for i in range(0,541+5)]
+degsPerP = 270.0/(541-1)
+
+def update_plot(k, scat, s):
+
+
+ s.send("go");
+ #time.sleep(0.1)
+ data = s.recv(BUFFER_SIZE)
+ try:
+ decdata = map(lambda x: int(x,16), data.split(' 21D ')[1].split(' ')[0:-1])[0:-5]
+ if len(decdata) != 541 :
+ print 'len: ', len(decdata)
+ degsPerP = 270.0/(len(myDistances)-1)
+ # generate x and y coordinates from distances
+ for i in range(0,len(myDistances)):
+ xData[i] = myDistances[i] * math.cos(math.radians(-45+i*degsPerP))
+ yData[i] = myDistances[i] * math.sin(math.radians(-45+i*degsPerP))
+ #print np.swapaxes(np.asarray((xData,yData)),0,1).shape
+
+ #xData = [0]+xData # add cross in origin
+ #yData = [0]+yData
+
+ scat.set_offsets(np.swapaxes(np.asarray((xData,yData)),1,0))
+
+ return scat
+
+ else:
+ print 'OK! 1'
+ myDistances = decdata
+ print 'OK! 2'
+ print len(myDistances)
+ degsPerP = 0.5 #
+
+ # generate x and y coordinates from distances
+ for i in range(0,len(myDistances)):
+ #print i
+ xData[i] = myDistances[i] * math.cos(math.radians(-45+i*degsPerP))
+ yData[i] = myDistances[i] * math.sin(math.radians(-45+i*degsPerP))
+
+ xData[len(myDistances)] = 0
+ yData[len(myDistances)] = 0
+ yData[len(myDistances)+1] = 200
+ xData[len(myDistances)+1] = 300
+
+ yData[len(myDistances)+2] = 200
+ xData[len(myDistances)+2] = -300
+
+ yData[len(myDistances)+3] = -650
+ xData[len(myDistances)+3] = 300
+
+ yData[len(myDistances)+4] = -650
+ xData[len(myDistances)+4] = -300
+ #print np.swapaxes(np.asarray((xData,yData)),0,1).shape
+ print 'OK! 3'
+ #print xData[0]
+ #print 'OK! 4'
+ #print xData
+ #print 'OK! 5'
+ #xData = [0]+xData # add cross in origin
+ #yData = [0]+yData
+
+ #print xData
+
+ scat.set_offsets(np.swapaxes(np.asarray((xData,yData)),1,0))
+
+ return scat
+ except :
+ print ('some error\n')
+ return scat
+
+
+
+
+def main():
+
+
+ plot_type = "blit"
+
+ s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+ s.connect((TCP_IP, TCP_PORT))
+
+ myDistances = [10,11,12,13,14,15,16,17,18,19,20, 22, 23]
+
+ #degsPerP = 270.0/(len(myDistances)-1)
+ print 'degs per P: ', degsPerP
+
+ scannerPosx = 0
+ scannerPosy = 0
+
+ xData = [0 for i in range(len(myDistances))]
+ yData = [0 for i in range(len(myDistances))]
+ # generate x and y coordinates from distances
+ for i in range(0,len(myDistances)):
+ xData[i] = myDistances[i] * math.cos(math.radians(180+45-i*degsPerP))
+ yData[i] = myDistances[i] * math.sin(math.radians(180+45-i*degsPerP))
+ #print 'i:',i, 'd:',myDistances[i], ', x:', xData[i], ', y:', yData[i]
+
+ xData = [0]+xData # add cross in origin
+ yData = [0]+yData
+ fig = plt.figure()
+ scat = plt.scatter(xData,yData, s=0.5, marker='x')
+ plt.xlim(-5000, 5000)
+ plt.ylim(-3000, 7000)
+ fig.gca().set_aspect('equal', adjustable='box')
+ #print len(yData)
+
+ print "Starting animation"
+ ani = animation.FuncAnimation(fig, update_plot, interval=500, frames=xrange(2), fargs=(scat, s))
+ plt.show()
+ s.close()
+
+main()
+
+
+
+#import matplotlib.pyplot as plt
+
+
+
+#start
+#MES
diff --git a/Laptop/lidar/relayer.py b/Laptop/lidar/relayer.py
new file mode 100644
index 0000000000000000000000000000000000000000..28c553ec150e8c53b4f7b66386c3825718834aca
--- /dev/null
+++ b/Laptop/lidar/relayer.py
@@ -0,0 +1,54 @@
+import matplotlib.pyplot as plt
+import numpy as np
+import matplotlib.animation as animation
+import math
+import socket
+import time
+
+LIDAR_IP = '10.180.65.30' #'169.254.13.125'
+PLOTTER_IP = '10.9.0.2' #'169.254.13.125'
+LIDAR_PORT = 2111
+PLOTTER_PORT = 2110
+BUFFER_SIZE = 10240
+MESSAGE = "\x02sRN LMDscandata\x03"
+
+
+
+
+def main():
+
+
+ plot_type = "blit"
+
+ sp = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+ sp.bind(('', PLOTTER_PORT))
+ print 'listening for sender...'
+ sp.listen(1)
+ conn, addr = sp.accept()
+ print 'Connected by', addr
+ #conn.send("Hello")
+
+ s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+ s.connect((LIDAR_IP, LIDAR_PORT))
+
+ while True:
+ # check if update needed
+ state = conn.recv(2)
+ print(state)
+ if state == "go":
+ print("state was go")
+ # request lidar data
+ s.sendall(MESSAGE)
+ data = s.recv(BUFFER_SIZE)
+ print data
+ #print data
+
+ #time.sleep(0.1)
+
+ # send lidar data
+ conn.sendall(data)
+
+ s.close()
+ conn.close()
+
+main()
diff --git a/Laptop/permoController.sh b/Laptop/permoController.sh
new file mode 100755
index 0000000000000000000000000000000000000000..8a8c7c611e33ae1f8c36dbdea8054014a1a15890
--- /dev/null
+++ b/Laptop/permoController.sh
@@ -0,0 +1,29 @@
+#!/bin/bash
+
+
+echo "starting controller"
+( python Robot/python/permobil/sender_udp_v2.py &> /dev/null ) &
+P0=$!
+
+echo "starting camera receivers"
+
+( ./Downloads/panasonic-ip-cam/scream_receiver/bin/scream_receiver 10.9.0.3 31110 ) &
+P1=$!
+
+
+( gst-launch-1.0 udpsrc port=30130 ! "application/x-rtp,payload=98,encoding-name=H264" ! rtpjitterbuffer latency=10 ! rtph264depay ! avdec_h264 ! videoconvert ! xvimagesink sync=false ) &
+P2=$!
+
+( gst-launch-1.0 udpsrc port=30132 ! "application/x-rtp,payload=98,encoding-name=H264" ! rtpjitterbuffer latency=10 ! rtph264depay ! avdec_h264 ! videoconvert ! xvimagesink sync=false ) &
+P3=$!
+
+( gst-launch-1.0 udpsrc port=30134 ! "application/x-rtp,payload=98,encoding-name=H264" ! rtpjitterbuffer latency=10 ! rtph264depay ! avdec_h264 ! videoconvert ! xvimagesink sync=false ) &
+P4=$!
+
+( gst-launch-1.0 udpsrc port=30136 ! "application/x-rtp,payload=98,encoding-name=H264" ! rtpjitterbuffer latency=10 ! rtph264depay ! avdec_h264 ! videoconvert ! xvimagesink sync=false ) &
+P5=$!
+
+
+echo "Receiver and camera pipes up!"
+wait $P0 $P1 $P2 $P3 $P4 $P5
+
diff --git a/Laptop/permoController_new.sh b/Laptop/permoController_new.sh
new file mode 100755
index 0000000000000000000000000000000000000000..f0cc90a2d7340d67a55f6fa838e49df1865e0f84
--- /dev/null
+++ b/Laptop/permoController_new.sh
@@ -0,0 +1,29 @@
+#!/bin/bash
+
+
+echo "starting controller"
+( python Robot/python/permobil/sender_udp_v2.py &> /dev/null ) &
+P0=$!
+
+echo "starting camera receivers"
+
+( ./scream/scream_receiver/bin/scream_receiver 10.9.0.3 31110 |& tee reciever.log ) &
+P1=$!
+
+
+( gst-launch-1.0 udpsrc port=30130 ! "application/x-rtp,payload=98,encoding-name=H264" ! rtpjitterbuffer latency=10 ! rtph264depay ! avdec_h264 ! videoconvert ! xvimagesink sync=false ) &
+P2=$!
+
+( gst-launch-1.0 udpsrc port=30132 ! "application/x-rtp,payload=98,encoding-name=H264" ! rtpjitterbuffer latency=10 ! rtph264depay ! avdec_h264 ! videoconvert ! xvimagesink sync=false ) &
+P3=$!
+
+( gst-launch-1.0 udpsrc port=30134 ! "application/x-rtp,payload=98,encoding-name=H264" ! rtpjitterbuffer latency=10 ! rtph264depay ! avdec_h264 ! videoconvert ! xvimagesink sync=false ) &
+P4=$!
+
+( gst-launch-1.0 udpsrc port=30136 ! "application/x-rtp,payload=98,encoding-name=H264" ! rtpjitterbuffer latency=10 ! rtph264depay ! avdec_h264 ! videoconvert ! xvimagesink sync=false ) &
+P5=$!
+
+
+echo "Receiver and camera pipes up!"
+wait $P0 $P1 $P2 $P3 $P4 $P5
+
diff --git a/Laptop/permoController_rust.sh b/Laptop/permoController_rust.sh
new file mode 100755
index 0000000000000000000000000000000000000000..ed98f0fb4de04fcd0bfc11266d8691fbb0ebb551
--- /dev/null
+++ b/Laptop/permoController_rust.sh
@@ -0,0 +1,29 @@
+#!/bin/bash
+
+
+#echo "starting controller"
+#( python Robot/python/permobil/sender_udp_v2.py &> /dev/null ) &
+#P0=$!
+
+echo "starting camera receivers"
+
+( ./scream/scream_receiver/bin/scream_receiver 10.9.0.3 31110 |& tee reciever.log ) &
+P1=$!
+
+
+( gst-launch-1.0 udpsrc port=30130 ! "application/x-rtp,payload=98,encoding-name=H264" ! rtpjitterbuffer latency=10 ! rtph264depay ! avdec_h264 ! videoconvert ! xvimagesink sync=false ) &
+P2=$!
+
+( gst-launch-1.0 udpsrc port=30132 ! "application/x-rtp,payload=98,encoding-name=H264" ! rtpjitterbuffer latency=10 ! rtph264depay ! avdec_h264 ! videoconvert ! xvimagesink sync=false ) &
+P3=$!
+
+( gst-launch-1.0 udpsrc port=30134 ! "application/x-rtp,payload=98,encoding-name=H264" ! rtpjitterbuffer latency=10 ! rtph264depay ! avdec_h264 ! videoconvert ! xvimagesink sync=false ) &
+P4=$!
+
+( gst-launch-1.0 udpsrc port=30136 ! "application/x-rtp,payload=98,encoding-name=H264" ! rtpjitterbuffer latency=10 ! rtph264depay ! avdec_h264 ! videoconvert ! xvimagesink sync=false ) &
+P5=$!
+
+
+echo "Receiver and camera pipes up!"
+wait $P1 $P2 $P3 $P4 $P5
+
diff --git a/Laptop/scream/rtsp/CMakeCache.txt b/Laptop/scream/rtsp/CMakeCache.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f9d0c37c7542417a2574495cd8358120c6954f44
--- /dev/null
+++ b/Laptop/scream/rtsp/CMakeCache.txt
@@ -0,0 +1,304 @@
+# This is the CMakeCache file.
+# For build in directory: /home/user/scream_panasonic/rtsp
+# It was generated by CMake: /usr/bin/cmake
+# You can edit this file to change values found and used by cmake.
+# If you do not want to change any of the values, simply exit the editor.
+# If you do want to change a value, simply edit, save, and exit the editor.
+# The syntax for the file is as follows:
+# KEY:TYPE=VALUE
+# KEY is the name of a variable in the cache.
+# TYPE is a hint to GUIs for the type of VALUE, DO NOT EDIT TYPE!.
+# VALUE is the current value for the KEY.
+
+########################
+# EXTERNAL cache entries
+########################
+
+//Path to a program.
+CMAKE_AR:FILEPATH=/usr/bin/ar
+
+//Choose the type of build, options are: None(CMAKE_CXX_FLAGS or
+// CMAKE_C_FLAGS used) Debug Release RelWithDebInfo MinSizeRel.
+CMAKE_BUILD_TYPE:STRING=
+
+//Enable/Disable color output during build.
+CMAKE_COLOR_MAKEFILE:BOOL=ON
+
+//CXX compiler
+CMAKE_CXX_COMPILER:FILEPATH=/usr/bin/c++
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+ ('0' + (((n) / 10000)%10)), \
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+ ('0' + (((n) / 100)%10)), \
+ ('0' + (((n) / 10)%10)), \
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+ ('0' + ((n)>>24 & 0xF)), \
+ ('0' + ((n)>>20 & 0xF)), \
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+ ('0' + ((n) & 0xF))
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+ 'c','o','m','p','i','l','e','r','_','v','e','r','s','i','o','n','[',
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+ 's','i','m','u','l','a','t','e','_','v','e','r','s','i','o','n','[',
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+# ifdef SIMULATE_VERSION_PATCH
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+# ifdef SIMULATE_VERSION_TWEAK
+ '.', SIMULATE_VERSION_TWEAK,
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+/* Construct the string literal in pieces to prevent the source from
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+char const* info_arch = "INFO" ":" "arch[" ARCHITECTURE_ID "]";
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+
+
+
+#if !defined(__STDC__)
+# if defined(_MSC_VER) && !defined(__clang__)
+# define C_DIALECT "90"
+# else
+# define C_DIALECT
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+ "INFO" ":" "dialect_default[" C_DIALECT "]";
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+void main() {}
+#else
+# if defined(__CLASSIC_C__)
+int main(argc, argv) int argc; char *argv[];
+# else
+int main(int argc, char* argv[])
+# endif
+{
+ int require = 0;
+ require += info_compiler[argc];
+ require += info_platform[argc];
+ require += info_arch[argc];
+#ifdef COMPILER_VERSION_MAJOR
+ require += info_version[argc];
+#endif
+#ifdef SIMULATE_ID
+ require += info_simulate[argc];
+#endif
+#ifdef SIMULATE_VERSION_MAJOR
+ require += info_simulate_version[argc];
+#endif
+#if defined(__CRAYXE) || defined(__CRAYXC)
+ require += info_cray[argc];
+#endif
+ require += info_language_dialect_default[argc];
+ (void)argv;
+ return require;
+}
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--- /dev/null
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+cmake_minimum_required(VERSION 2.6)
+
+PROJECT( scream )
+
+message("Source Dir:" ${scream_SOURCE_DIR})
+
+SET(EXECUTABLE_OUTPUT_PATH ${scream_SOURCE_DIR}/bin)
+SET(LIBRARY_OUTPUT_PATH ${scream_SOURCE_DIR}/lib)
+SET(RUNTIME_OUTPUT_DIRECTORY ${scream_SOURCE_DIR}/bin)
+
+SET(scream_BIN ${scream_SOURCE_DIR}/bin)
+
+message("scream_SOURCE_DIR directories:" ${scream_SOURCE_DIR})
+
+IF(UNIX)
+add_definitions(-std=c++0x)
+ENDIF(UNIX)
+
+IF(WIN32)
+IF(MSVC12)
+message("Detected MSVC12 compiler")
+set(MSVC_VER VC12)
+ELSEIF(MSVC11)
+message("Detected MSVC11 compiler")
+set(MSVC_VER VC11)
+ELSEIF(MSVC10)
+message("Detected MSVC10 compiler")
+set(MSVC_VER VC10)
+ELSEIF(MSVC14)
+message("Detected MSVC14 compiler")
+set(MSVC_VER VC14)
+ELSE(MSVC12)
+message("WARNING: Unknown/unsupported MSVC version")
+ENDIF(MSVC12)
+ENDIF(WIN32)
+
+if( CMAKE_SIZEOF_VOID_P EQUAL 8 )
+# 64bit
+ message("Detected 64-bit build - compiling with -fPIC")
+ SET(CMAKE_CXX_FLAGS "-fPIC -fpermissive -pthread")
+else( CMAKE_SIZEOF_VOID_P EQUAL 8 )
+# 32 bit
+message("Detected 32-bit build")
+SET(CMAKE_CXX_FLAGS "-fpermissive -pthread")
+endif( CMAKE_SIZEOF_VOID_P EQUAL 8 )
+
+#SET(LDFLAGS "-lrt -pthread -lpthread -lncurses")
+
+SET(screamIncludes
+${scream_SOURCE_DIR}
+${scream_SOURCE_DIR}/code
+)
+
+message("screamIncludes directories:" ${screamIncludes})
+
+# lib directories
+IF(WIN32)
+SET(screamLink
+${scream_SOURCE_DIR}/../lib
+)
+ELSEIF(UNIX)
+SET(screamLink
+${scream_SOURCE_DIR}/../lib
+/usr/local/lib
+/usr/lib
+)
+ENDIF(WIN32)
+
+SET(LibDir
+${scream_SOURCE_DIR}/../lib
+)
+
+
+set(LIBS ${LIBS} -lncurses)
+
+message("LibDir directories:" ${LibDir})
+
+# Include directories
+INCLUDE_DIRECTORIES(
+${scream_SOURCE_DIR}/../include
+)
+
+ADD_SUBDIRECTORY( code)
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+# CMAKE generated file: DO NOT EDIT!
+# Generated by "Unix Makefiles" Generator, CMake Version 3.7
+
+# Default target executed when no arguments are given to make.
+default_target: all
+
+.PHONY : default_target
+
+# Allow only one "make -f Makefile2" at a time, but pass parallelism.
+.NOTPARALLEL:
+
+
+#=============================================================================
+# Special targets provided by cmake.
+
+# Disable implicit rules so canonical targets will work.
+.SUFFIXES:
+
+
+# Remove some rules from gmake that .SUFFIXES does not remove.
+SUFFIXES =
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+.SUFFIXES: .hpux_make_needs_suffix_list
+
+
+# Suppress display of executed commands.
+$(VERBOSE).SILENT:
+
+
+# A target that is always out of date.
+cmake_force:
+
+.PHONY : cmake_force
+
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+
+# The shell in which to execute make rules.
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+# The command to remove a file.
+RM = /usr/bin/cmake -E remove -f
+
+# Escaping for special characters.
+EQUALS = =
+
+# The top-level source directory on which CMake was run.
+CMAKE_SOURCE_DIR = /home/user/scream_panasonic/rtsp
+
+# The top-level build directory on which CMake was run.
+CMAKE_BINARY_DIR = /home/user/scream_panasonic/rtsp
+
+#=============================================================================
+# Targets provided globally by CMake.
+
+# Special rule for the target rebuild_cache
+rebuild_cache:
+ @$(CMAKE_COMMAND) -E cmake_echo_color --switch=$(COLOR) --cyan "Running CMake to regenerate build system..."
+ /usr/bin/cmake -H$(CMAKE_SOURCE_DIR) -B$(CMAKE_BINARY_DIR)
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+# Special rule for the target rebuild_cache
+rebuild_cache/fast: rebuild_cache
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+ /usr/bin/cmake -E echo No\ interactive\ CMake\ dialog\ available.
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+# Special rule for the target edit_cache
+edit_cache/fast: edit_cache
+
+.PHONY : edit_cache/fast
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+# The main all target
+all: cmake_check_build_system
+ $(CMAKE_COMMAND) -E cmake_progress_start /home/user/scream_panasonic/rtsp/CMakeFiles /home/user/scream_panasonic/rtsp/CMakeFiles/progress.marks
+ $(MAKE) -f CMakeFiles/Makefile2 all
+ $(CMAKE_COMMAND) -E cmake_progress_start /home/user/scream_panasonic/rtsp/CMakeFiles 0
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+ $(MAKE) -f CMakeFiles/Makefile2 preinstall
+.PHONY : preinstall/fast
+
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+ $(CMAKE_COMMAND) -H$(CMAKE_SOURCE_DIR) -B$(CMAKE_BINARY_DIR) --check-build-system CMakeFiles/Makefile.cmake 1
+.PHONY : depend
+
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+# Target rules for targets named rtsp
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+ $(MAKE) -f CMakeFiles/Makefile2 rtsp
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+
+# fast build rule for target.
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+ $(MAKE) -f code/CMakeFiles/rtsp.dir/build.make code/CMakeFiles/rtsp.dir/build
+.PHONY : rtsp/fast
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+ @echo "... all (the default if no target is provided)"
+ @echo "... clean"
+ @echo "... depend"
+ @echo "... rebuild_cache"
+ @echo "... edit_cache"
+ @echo "... rtsp"
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+
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@@ -0,0 +1,50 @@
+# Install script for directory: /home/user/scream_panasonic/rtsp
+
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+ set(CMAKE_INSTALL_PREFIX "/usr/local")
+endif()
+string(REGEX REPLACE "/$" "" CMAKE_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}")
+
+# Set the install configuration name.
+if(NOT DEFINED CMAKE_INSTALL_CONFIG_NAME)
+ if(BUILD_TYPE)
+ string(REGEX REPLACE "^[^A-Za-z0-9_]+" ""
+ CMAKE_INSTALL_CONFIG_NAME "${BUILD_TYPE}")
+ else()
+ set(CMAKE_INSTALL_CONFIG_NAME "")
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+ message(STATUS "Install configuration: \"${CMAKE_INSTALL_CONFIG_NAME}\"")
+endif()
+
+# Set the component getting installed.
+if(NOT CMAKE_INSTALL_COMPONENT)
+ if(COMPONENT)
+ message(STATUS "Install component: \"${COMPONENT}\"")
+ set(CMAKE_INSTALL_COMPONENT "${COMPONENT}")
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+ set(CMAKE_INSTALL_COMPONENT)
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+
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+ set(CMAKE_INSTALL_SO_NO_EXE "1")
+endif()
+
+if(NOT CMAKE_INSTALL_LOCAL_ONLY)
+ # Include the install script for each subdirectory.
+ include("/home/user/scream_panasonic/rtsp/code/cmake_install.cmake")
+
+endif()
+
+if(CMAKE_INSTALL_COMPONENT)
+ set(CMAKE_INSTALL_MANIFEST "install_manifest_${CMAKE_INSTALL_COMPONENT}.txt")
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+ set(CMAKE_INSTALL_MANIFEST "install_manifest.txt")
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+string(REPLACE ";" "\n" CMAKE_INSTALL_MANIFEST_CONTENT
+ "${CMAKE_INSTALL_MANIFEST_FILES}")
+file(WRITE "/home/user/scream_panasonic/rtsp/${CMAKE_INSTALL_MANIFEST}"
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+
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+"CMakeFiles/rtsp.dir/rtsp.cpp.o"
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+
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+SET(SRCS
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+
+SET(HEADERS
+)
+
+SET(SRC_1
+${SRCS}
+rtsp.cpp
+)
+
+INCLUDE_DIRECTORIES(
+${screamIncludes}
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+LINK_DIRECTORIES(
+${screamLink}
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+${screamLibs}
+)
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+
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+
+# Disable implicit rules so canonical targets will work.
+.SUFFIXES:
+
+
+# Remove some rules from gmake that .SUFFIXES does not remove.
+SUFFIXES =
+
+.SUFFIXES: .hpux_make_needs_suffix_list
+
+
+# Suppress display of executed commands.
+$(VERBOSE).SILENT:
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+
+# A target that is always out of date.
+cmake_force:
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+.PHONY : cmake_force
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+#=============================================================================
+# Set environment variables for the build.
+
+# The shell in which to execute make rules.
+SHELL = /bin/sh
+
+# The CMake executable.
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+
+# The command to remove a file.
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+
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+
+# The top-level source directory on which CMake was run.
+CMAKE_SOURCE_DIR = /home/user/scream_panasonic/rtsp
+
+# The top-level build directory on which CMake was run.
+CMAKE_BINARY_DIR = /home/user/scream_panasonic/rtsp
+
+#=============================================================================
+# Targets provided globally by CMake.
+
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+ /usr/bin/cmake -E echo No\ interactive\ CMake\ dialog\ available.
+.PHONY : edit_cache
+
+# Special rule for the target edit_cache
+edit_cache/fast: edit_cache
+
+.PHONY : edit_cache/fast
+
+# Special rule for the target rebuild_cache
+rebuild_cache:
+ @$(CMAKE_COMMAND) -E cmake_echo_color --switch=$(COLOR) --cyan "Running CMake to regenerate build system..."
+ /usr/bin/cmake -H$(CMAKE_SOURCE_DIR) -B$(CMAKE_BINARY_DIR)
+.PHONY : rebuild_cache
+
+# Special rule for the target rebuild_cache
+rebuild_cache/fast: rebuild_cache
+
+.PHONY : rebuild_cache/fast
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+# The main all target
+all: cmake_check_build_system
+ cd /home/user/scream_panasonic/rtsp && $(CMAKE_COMMAND) -E cmake_progress_start /home/user/scream_panasonic/rtsp/CMakeFiles /home/user/scream_panasonic/rtsp/code/CMakeFiles/progress.marks
+ cd /home/user/scream_panasonic/rtsp && $(MAKE) -f CMakeFiles/Makefile2 code/all
+ $(CMAKE_COMMAND) -E cmake_progress_start /home/user/scream_panasonic/rtsp/CMakeFiles 0
+.PHONY : all
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+# The main clean target
+clean:
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+.PHONY : clean
+
+# The main clean target
+clean/fast: clean
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+
+# Prepare targets for installation.
+preinstall: all
+ cd /home/user/scream_panasonic/rtsp && $(MAKE) -f CMakeFiles/Makefile2 code/preinstall
+.PHONY : preinstall
+
+# Prepare targets for installation.
+preinstall/fast:
+ cd /home/user/scream_panasonic/rtsp && $(MAKE) -f CMakeFiles/Makefile2 code/preinstall
+.PHONY : preinstall/fast
+
+# clear depends
+depend:
+ cd /home/user/scream_panasonic/rtsp && $(CMAKE_COMMAND) -H$(CMAKE_SOURCE_DIR) -B$(CMAKE_BINARY_DIR) --check-build-system CMakeFiles/Makefile.cmake 1
+.PHONY : depend
+
+# Convenience name for target.
+code/CMakeFiles/rtsp.dir/rule:
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+.PHONY : code/CMakeFiles/rtsp.dir/rule
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+# Convenience name for target.
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+rtsp.o: rtsp.cpp.o
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+
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+ cd /home/user/scream_panasonic/rtsp && $(MAKE) -f code/CMakeFiles/rtsp.dir/build.make code/CMakeFiles/rtsp.dir/rtsp.cpp.s
+.PHONY : rtsp.cpp.s
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+# Help Target
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+ @echo "... clean"
+ @echo "... depend"
+ @echo "... edit_cache"
+ @echo "... rebuild_cache"
+ @echo "... rtsp"
+ @echo "... rtsp.o"
+ @echo "... rtsp.i"
+ @echo "... rtsp.s"
+.PHONY : help
+
+
+
+#=============================================================================
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+
+# Special rule to run CMake to check the build system integrity.
+# No rule that depends on this can have commands that come from listfiles
+# because they might be regenerated.
+cmake_check_build_system:
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@@ -0,0 +1,34 @@
+# Install script for directory: /home/user/scream_panasonic/rtsp/code
+
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+if(NOT DEFINED CMAKE_INSTALL_PREFIX)
+ set(CMAKE_INSTALL_PREFIX "/usr/local")
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+string(REGEX REPLACE "/$" "" CMAKE_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}")
+
+# Set the install configuration name.
+if(NOT DEFINED CMAKE_INSTALL_CONFIG_NAME)
+ if(BUILD_TYPE)
+ string(REGEX REPLACE "^[^A-Za-z0-9_]+" ""
+ CMAKE_INSTALL_CONFIG_NAME "${BUILD_TYPE}")
+ else()
+ set(CMAKE_INSTALL_CONFIG_NAME "")
+ endif()
+ message(STATUS "Install configuration: \"${CMAKE_INSTALL_CONFIG_NAME}\"")
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+# Set the component getting installed.
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+ if(COMPONENT)
+ message(STATUS "Install component: \"${COMPONENT}\"")
+ set(CMAKE_INSTALL_COMPONENT "${COMPONENT}")
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+ endif()
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diff --git a/Laptop/scream/rtsp/code/rtsp.cpp b/Laptop/scream/rtsp/code/rtsp.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..0f4dbccc03449447f9345cbc535600b3feab5b58
--- /dev/null
+++ b/Laptop/scream/rtsp/code/rtsp.cpp
@@ -0,0 +1 @@
+// Scream sender side wrapper
#include "sys/socket.h"
#include "sys/types.h"
#include "netinet/in.h"
#include <string.h> /* needed for memset */
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/time.h>
#include <iostream>
#include <pthread.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/time.h>
#include <signal.h>
struct itimerval timer;
struct sigaction sa;
using namespace std;
#define BUF_SIZE 10000
char buf[BUF_SIZE];
uint32_t ssrc = 0;
// We don't bother about ssrc in this implementation, it is only one stream
char *ENCODER_IP = "192.168.0.10";
struct sockaddr_in http_addr;
int http_sock = 0;
/*
* Create socket to Video encoder
* for rate commands etc.
*/
int create_tcp_socket() {
int sock;
if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0){
cerr << "Can't create TCP socket" << endl;
exit(1);
}
return sock;
}
int setup_rtsp() {
http_addr.sin_family = AF_INET;
http_addr.sin_addr.s_addr = htonl(INADDR_ANY);
inet_aton(ENCODER_IP, (in_addr*)&http_addr.sin_addr.s_addr);
http_addr.sin_port = htons(554);
if (connect(http_sock, (struct sockaddr *)&http_addr, sizeof(struct sockaddr)) < 0){
cerr << "Could not connect to Video coder HTTP server" << endl;
exit(1);
}
}
bool verbose = true;
const void sendRtspCommand() {
int sent = 0;
int tmpres = 0;
if (verbose) {
cerr << "--------------------------------------------" << endl;
cerr << "Send RTSP : " << endl << buf << endl;
}
bool errSend = false;
/*
* Send HTTP GET
*/
while (sent < strlen(buf)) {
tmpres = send(http_sock, buf + sent, strlen(buf) - sent, 0);
if (tmpres == -1){
cerr << "Can't send RTSP" << endl;
errSend = true;
}
sent += tmpres;
}
if (true && !errSend) {
memset(buf, 0, sizeof(buf));
tmpres = recv(http_sock, buf, BUF_SIZE, 0);
if (verbose) {
cerr << "response: " << endl << buf << endl;
}
}
if (strstr(buf,"Bad Request")) {
close(http_sock);
cerr << "Dishonorable discharge due to malformed request" << endl;
exit(0);
}
}
long getTimeInUs(){
struct timeval tp;
gettimeofday(&tp, NULL);
long us = tp.tv_sec * 1000000 + tp.tv_usec;
return us;
}
bool terminateRtsp = false;
const void *keyboardThread(void *arg) {
cin.ignore();
terminateRtsp = true;
}
//#include <curses.h>
char session[100];
int iter = 0;
int INCOMING_RTP_PORT = 30120;
int main(int argc, char* argv[]) {
int ix = 1;
int cSeq = 1;
uint64_t t0 = getTimeInUs();
/*
* Parse command line
*/
if (argc <= 1) {
cerr << "Usage : " << endl << " rtsp encoder_ip client_rtp_port" << endl;
exit(-1);
}
ENCODER_IP = argv[ix];ix++;
INCOMING_RTP_PORT = atoi(argv[ix]);ix++;
http_sock = create_tcp_socket();
setup_rtsp();
sprintf(buf, "OPTIONS rtsp://%s/MediaInput/h264 RTSP/1.0\r\nCSeq: %d\r\nUser-Agent: Dummy SCReAM RTSP client\r\n\r\n",ENCODER_IP,cSeq++);
sendRtspCommand();
sprintf(buf, "DESCRIBE rtsp://%s/MediaInput/h264 RTSP/1.0\r\nCSeq: %d\r\nUser-Agent: Dummy SCReAM RTSP client\r\nAccept: application/sdp\r\n\r\n",ENCODER_IP,cSeq++);
sendRtspCommand();
sprintf(buf, "SETUP rtsp://%s/MediaInput/h264/trackID=1 RTSP/1.0\r\nCSeq: %d\r\nUser-Agent: Dummy SCReAM RTSP client\r\nTransport: RTP/AVP;unicast;client_port=%d-%d\r\n\r\n",ENCODER_IP,cSeq++,INCOMING_RTP_PORT,INCOMING_RTP_PORT+1);
sendRtspCommand();
char ssrc[100];
if (strlen(buf) > 0) {
char *sp = strstr(buf,"ssrc=");
if (sp) {
strcpy(ssrc,sp+5);
}
sp = strstr(buf,"Session:");
sp = strtok(sp," ;\r\n");
sp = strtok(0," ;\r\n");
strcpy(session,sp);
}
sprintf(buf, "PLAY rtsp://%s/MediaInput/h264 RTSP/1.0\r\nCSeq: %d\r\nUser-Agent: Dummy SCReAM RTSP client\r\nSession: %s\r\nRange: npt=0.000-\r\n\r\n",ENCODER_IP,cSeq++,session);
sendRtspCommand();
sprintf(buf, "GET_PARAMETER rtsp://%s/MediaInput/h264 RTSP/1.0\r\nCSeq: %d\r\nUser-Agent: Dummy SCReAM RTSP client\r\nSession: %s\r\n\r\n",ENCODER_IP,cSeq++,session);
sendRtspCommand();
cerr << "Streaming started. IP:" << ENCODER_IP << " port:" << INCOMING_RTP_PORT << " SSRC:" << ssrc << endl;
cerr << "RTSP streaming started, press ENTER to stop" << endl;
pthread_t keyboard_thread;
/* Create keyboard thread */
pthread_create(&keyboard_thread,NULL,keyboardThread,"Keyboard thread...");
verbose = false;
while (!terminateRtsp) {
//if (getch() != 0) {
// exit = true;
//}
sleep(1);
if (getTimeInUs()-t0 > 1000000) {
iter++;
if (iter % 30 == 0) {
cerr << "Send GET_PARAMETER keep-alive message to keep RTSP session running.\n Press ENTER to stop RTSP" << endl;
sprintf(buf, "GET_PARAMETER rtsp://%s/MediaInput/h264 RTSP/1.0\r\nCSeq: %d\r\nUser-Agent: Dummy SCReAM RTSP client\r\nSession: %s\r\n\r\n",ENCODER_IP,cSeq++,session);
sendRtspCommand();
}
t0 = getTimeInUs();
}
}
verbose = true;
sprintf(buf, "TEARDOWN rtsp://%s/MediaInput/h264 RTSP/1.0\r\nCSeq: %d\r\nUser-Agent: Dummy SCReAM RTSP client\r\nSession: %s\r\n\r\n",ENCODER_IP,cSeq++,session);
sendRtspCommand();
close(http_sock);
}
\ No newline at end of file
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new file mode 100644
index 0000000000000000000000000000000000000000..f47b7e962df4246a6637936511d821c04debfd48
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+
+//Flags used by the linker during Release with Debug Info builds.
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+
+//Flags used by the linker during release builds.
+CMAKE_MODULE_LINKER_FLAGS_RELEASE:STRING=
+
+//Flags used by the linker during Release with Debug Info builds.
+CMAKE_MODULE_LINKER_FLAGS_RELWITHDEBINFO:STRING=
+
+//Value Computed by CMake
+CMAKE_PROJECT_NAME:STATIC=scream
+
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+
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+# endif
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+# define COMPILER_VERSION_MINOR HEX(__SUNPRO_C>>4 & 0xFF)
+# define COMPILER_VERSION_PATCH HEX(__SUNPRO_C & 0xF)
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+# define COMPILER_VERSION_PATCH DEC(__TI_COMPILER_VERSION__ % 1000)
+
+#elif defined(__FUJITSU) || defined(__FCC_VERSION) || defined(__fcc_version)
+# define COMPILER_ID "Fujitsu"
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+#elif defined(__TINYC__)
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+#elif defined(__BCC__)
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+# define SIMULATE_VERSION_MINOR DEC(_MSC_VER % 100)
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+# endif
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+# define COMPILER_VERSION_MAJOR HEX(__VISUALDSPVERSION__>>24)
+# define COMPILER_VERSION_MINOR HEX(__VISUALDSPVERSION__>>16 & 0xFF)
+# define COMPILER_VERSION_PATCH HEX(__VISUALDSPVERSION__>>8 & 0xFF)
+#endif
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+#elif defined(__IAR_SYSTEMS_ICC__ ) || defined(__IAR_SYSTEMS_ICC)
+# define COMPILER_ID "IAR"
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+#elif defined(__ARMCC_VERSION)
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+ /* __ARMCC_VERSION = VRRPPPP */
+ # define COMPILER_VERSION_MAJOR DEC(__ARMCC_VERSION/1000000)
+ # define COMPILER_VERSION_MINOR DEC(__ARMCC_VERSION/10000 % 100)
+ # define COMPILER_VERSION_PATCH DEC(__ARMCC_VERSION % 10000)
+#else
+ /* __ARMCC_VERSION = VRPPPP */
+ # define COMPILER_VERSION_MAJOR DEC(__ARMCC_VERSION/100000)
+ # define COMPILER_VERSION_MINOR DEC(__ARMCC_VERSION/10000 % 10)
+ # define COMPILER_VERSION_PATCH DEC(__ARMCC_VERSION % 10000)
+#endif
+
+
+#elif defined(SDCC)
+# define COMPILER_ID "SDCC"
+ /* SDCC = VRP */
+# define COMPILER_VERSION_MAJOR DEC(SDCC/100)
+# define COMPILER_VERSION_MINOR DEC(SDCC/10 % 10)
+# define COMPILER_VERSION_PATCH DEC(SDCC % 10)
+
+#elif defined(_SGI_COMPILER_VERSION) || defined(_COMPILER_VERSION)
+# define COMPILER_ID "MIPSpro"
+# if defined(_SGI_COMPILER_VERSION)
+ /* _SGI_COMPILER_VERSION = VRP */
+# define COMPILER_VERSION_MAJOR DEC(_SGI_COMPILER_VERSION/100)
+# define COMPILER_VERSION_MINOR DEC(_SGI_COMPILER_VERSION/10 % 10)
+# define COMPILER_VERSION_PATCH DEC(_SGI_COMPILER_VERSION % 10)
+# else
+ /* _COMPILER_VERSION = VRP */
+# define COMPILER_VERSION_MAJOR DEC(_COMPILER_VERSION/100)
+# define COMPILER_VERSION_MINOR DEC(_COMPILER_VERSION/10 % 10)
+# define COMPILER_VERSION_PATCH DEC(_COMPILER_VERSION % 10)
+# endif
+
+
+/* These compilers are either not known or too old to define an
+ identification macro. Try to identify the platform and guess that
+ it is the native compiler. */
+#elif defined(__sgi)
+# define COMPILER_ID "MIPSpro"
+
+#elif defined(__hpux) || defined(__hpua)
+# define COMPILER_ID "HP"
+
+#else /* unknown compiler */
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+#endif
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+ getting matched. Store it in a pointer rather than an array
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+char const* info_simulate = "INFO" ":" "simulate[" SIMULATE_ID "]";
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+char const* qnxnto = "INFO" ":" "qnxnto[]";
+#endif
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+#if defined(__CRAYXE) || defined(__CRAYXC)
+char const *info_cray = "INFO" ":" "compiler_wrapper[CrayPrgEnv]";
+#endif
+
+#define STRINGIFY_HELPER(X) #X
+#define STRINGIFY(X) STRINGIFY_HELPER(X)
+
+/* Identify known platforms by name. */
+#if defined(__linux) || defined(__linux__) || defined(linux)
+# define PLATFORM_ID "Linux"
+
+#elif defined(__CYGWIN__)
+# define PLATFORM_ID "Cygwin"
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+#elif defined(__sun) || defined(sun)
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+#elif defined(__WATCOMC__)
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+# elif defined(__WINDOWS__)
+# define PLATFORM_ID "Windows3x"
+
+# else /* unknown platform */
+# define PLATFORM_ID
+# endif
+
+#else /* unknown platform */
+# define PLATFORM_ID
+
+#endif
+
+/* For windows compilers MSVC and Intel we can determine
+ the architecture of the compiler being used. This is because
+ the compilers do not have flags that can change the architecture,
+ but rather depend on which compiler is being used
+*/
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+# if defined(_M_IA64)
+# define ARCHITECTURE_ID "IA64"
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+# define ARCHITECTURE_ID "X86"
+
+# elif defined(_M_ARM)
+# if _M_ARM == 4
+# define ARCHITECTURE_ID "ARMV4I"
+# elif _M_ARM == 5
+# define ARCHITECTURE_ID "ARMV5I"
+# else
+# define ARCHITECTURE_ID "ARMV" STRINGIFY(_M_ARM)
+# endif
+
+# elif defined(_M_MIPS)
+# define ARCHITECTURE_ID "MIPS"
+
+# elif defined(_M_SH)
+# define ARCHITECTURE_ID "SHx"
+
+# else /* unknown architecture */
+# define ARCHITECTURE_ID ""
+# endif
+
+#elif defined(__WATCOMC__)
+# if defined(_M_I86)
+# define ARCHITECTURE_ID "I86"
+
+# elif defined(_M_IX86)
+# define ARCHITECTURE_ID "X86"
+
+# else /* unknown architecture */
+# define ARCHITECTURE_ID ""
+# endif
+
+#else
+# define ARCHITECTURE_ID
+#endif
+
+/* Convert integer to decimal digit literals. */
+#define DEC(n) \
+ ('0' + (((n) / 10000000)%10)), \
+ ('0' + (((n) / 1000000)%10)), \
+ ('0' + (((n) / 100000)%10)), \
+ ('0' + (((n) / 10000)%10)), \
+ ('0' + (((n) / 1000)%10)), \
+ ('0' + (((n) / 100)%10)), \
+ ('0' + (((n) / 10)%10)), \
+ ('0' + ((n) % 10))
+
+/* Convert integer to hex digit literals. */
+#define HEX(n) \
+ ('0' + ((n)>>28 & 0xF)), \
+ ('0' + ((n)>>24 & 0xF)), \
+ ('0' + ((n)>>20 & 0xF)), \
+ ('0' + ((n)>>16 & 0xF)), \
+ ('0' + ((n)>>12 & 0xF)), \
+ ('0' + ((n)>>8 & 0xF)), \
+ ('0' + ((n)>>4 & 0xF)), \
+ ('0' + ((n) & 0xF))
+
+/* Construct a string literal encoding the version number components. */
+#ifdef COMPILER_VERSION_MAJOR
+char const info_version[] = {
+ 'I', 'N', 'F', 'O', ':',
+ 'c','o','m','p','i','l','e','r','_','v','e','r','s','i','o','n','[',
+ COMPILER_VERSION_MAJOR,
+# ifdef COMPILER_VERSION_MINOR
+ '.', COMPILER_VERSION_MINOR,
+# ifdef COMPILER_VERSION_PATCH
+ '.', COMPILER_VERSION_PATCH,
+# ifdef COMPILER_VERSION_TWEAK
+ '.', COMPILER_VERSION_TWEAK,
+# endif
+# endif
+# endif
+ ']','\0'};
+#endif
+
+/* Construct a string literal encoding the version number components. */
+#ifdef SIMULATE_VERSION_MAJOR
+char const info_simulate_version[] = {
+ 'I', 'N', 'F', 'O', ':',
+ 's','i','m','u','l','a','t','e','_','v','e','r','s','i','o','n','[',
+ SIMULATE_VERSION_MAJOR,
+# ifdef SIMULATE_VERSION_MINOR
+ '.', SIMULATE_VERSION_MINOR,
+# ifdef SIMULATE_VERSION_PATCH
+ '.', SIMULATE_VERSION_PATCH,
+# ifdef SIMULATE_VERSION_TWEAK
+ '.', SIMULATE_VERSION_TWEAK,
+# endif
+# endif
+# endif
+ ']','\0'};
+#endif
+
+/* Construct the string literal in pieces to prevent the source from
+ getting matched. Store it in a pointer rather than an array
+ because some compilers will just produce instructions to fill the
+ array rather than assigning a pointer to a static array. */
+char const* info_platform = "INFO" ":" "platform[" PLATFORM_ID "]";
+char const* info_arch = "INFO" ":" "arch[" ARCHITECTURE_ID "]";
+
+
+
+
+#if !defined(__STDC__)
+# if defined(_MSC_VER) && !defined(__clang__)
+# define C_DIALECT "90"
+# else
+# define C_DIALECT
+# endif
+#elif __STDC_VERSION__ >= 201000L
+# define C_DIALECT "11"
+#elif __STDC_VERSION__ >= 199901L
+# define C_DIALECT "99"
+#else
+# define C_DIALECT "90"
+#endif
+const char* info_language_dialect_default =
+ "INFO" ":" "dialect_default[" C_DIALECT "]";
+
+/*--------------------------------------------------------------------------*/
+
+#ifdef ID_VOID_MAIN
+void main() {}
+#else
+# if defined(__CLASSIC_C__)
+int main(argc, argv) int argc; char *argv[];
+# else
+int main(int argc, char* argv[])
+# endif
+{
+ int require = 0;
+ require += info_compiler[argc];
+ require += info_platform[argc];
+ require += info_arch[argc];
+#ifdef COMPILER_VERSION_MAJOR
+ require += info_version[argc];
+#endif
+#ifdef SIMULATE_ID
+ require += info_simulate[argc];
+#endif
+#ifdef SIMULATE_VERSION_MAJOR
+ require += info_simulate_version[argc];
+#endif
+#if defined(__CRAYXE) || defined(__CRAYXC)
+ require += info_cray[argc];
+#endif
+ require += info_language_dialect_default[argc];
+ (void)argv;
+ return require;
+}
+#endif
diff --git a/Laptop/scream/scream_receiver/CMakeFiles/3.7.2/CompilerIdC/a.out b/Laptop/scream/scream_receiver/CMakeFiles/3.7.2/CompilerIdC/a.out
new file mode 100755
index 0000000000000000000000000000000000000000..2c9d824bf34e6384541157ce258ad086b4372b81
Binary files /dev/null and b/Laptop/scream/scream_receiver/CMakeFiles/3.7.2/CompilerIdC/a.out differ
diff --git a/Laptop/scream/scream_receiver/CMakeFiles/3.7.2/CompilerIdCXX/CMakeCXXCompilerId.cpp b/Laptop/scream/scream_receiver/CMakeFiles/3.7.2/CompilerIdCXX/CMakeCXXCompilerId.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..a6e6bedec4f7adf424f8ebaf03d7dba4adbaa432
--- /dev/null
+++ b/Laptop/scream/scream_receiver/CMakeFiles/3.7.2/CompilerIdCXX/CMakeCXXCompilerId.cpp
@@ -0,0 +1,533 @@
+/* This source file must have a .cpp extension so that all C++ compilers
+ recognize the extension without flags. Borland does not know .cxx for
+ example. */
+#ifndef __cplusplus
+# error "A C compiler has been selected for C++."
+#endif
+
+
+/* Version number components: V=Version, R=Revision, P=Patch
+ Version date components: YYYY=Year, MM=Month, DD=Day */
+
+#if defined(__COMO__)
+# define COMPILER_ID "Comeau"
+ /* __COMO_VERSION__ = VRR */
+# define COMPILER_VERSION_MAJOR DEC(__COMO_VERSION__ / 100)
+# define COMPILER_VERSION_MINOR DEC(__COMO_VERSION__ % 100)
+
+#elif defined(__INTEL_COMPILER) || defined(__ICC)
+# define COMPILER_ID "Intel"
+# if defined(_MSC_VER)
+# define SIMULATE_ID "MSVC"
+# endif
+ /* __INTEL_COMPILER = VRP */
+# define COMPILER_VERSION_MAJOR DEC(__INTEL_COMPILER/100)
+# define COMPILER_VERSION_MINOR DEC(__INTEL_COMPILER/10 % 10)
+# if defined(__INTEL_COMPILER_UPDATE)
+# define COMPILER_VERSION_PATCH DEC(__INTEL_COMPILER_UPDATE)
+# else
+# define COMPILER_VERSION_PATCH DEC(__INTEL_COMPILER % 10)
+# endif
+# if defined(__INTEL_COMPILER_BUILD_DATE)
+ /* __INTEL_COMPILER_BUILD_DATE = YYYYMMDD */
+# define COMPILER_VERSION_TWEAK DEC(__INTEL_COMPILER_BUILD_DATE)
+# endif
+# if defined(_MSC_VER)
+ /* _MSC_VER = VVRR */
+# define SIMULATE_VERSION_MAJOR DEC(_MSC_VER / 100)
+# define SIMULATE_VERSION_MINOR DEC(_MSC_VER % 100)
+# endif
+
+#elif defined(__PATHCC__)
+# define COMPILER_ID "PathScale"
+# define COMPILER_VERSION_MAJOR DEC(__PATHCC__)
+# define COMPILER_VERSION_MINOR DEC(__PATHCC_MINOR__)
+# if defined(__PATHCC_PATCHLEVEL__)
+# define COMPILER_VERSION_PATCH DEC(__PATHCC_PATCHLEVEL__)
+# endif
+
+#elif defined(__BORLANDC__) && defined(__CODEGEARC_VERSION__)
+# define COMPILER_ID "Embarcadero"
+# define COMPILER_VERSION_MAJOR HEX(__CODEGEARC_VERSION__>>24 & 0x00FF)
+# define COMPILER_VERSION_MINOR HEX(__CODEGEARC_VERSION__>>16 & 0x00FF)
+# define COMPILER_VERSION_PATCH DEC(__CODEGEARC_VERSION__ & 0xFFFF)
+
+#elif defined(__BORLANDC__)
+# define COMPILER_ID "Borland"
+ /* __BORLANDC__ = 0xVRR */
+# define COMPILER_VERSION_MAJOR HEX(__BORLANDC__>>8)
+# define COMPILER_VERSION_MINOR HEX(__BORLANDC__ & 0xFF)
+
+#elif defined(__WATCOMC__) && __WATCOMC__ < 1200
+# define COMPILER_ID "Watcom"
+ /* __WATCOMC__ = VVRR */
+# define COMPILER_VERSION_MAJOR DEC(__WATCOMC__ / 100)
+# define COMPILER_VERSION_MINOR DEC((__WATCOMC__ / 10) % 10)
+# if (__WATCOMC__ % 10) > 0
+# define COMPILER_VERSION_PATCH DEC(__WATCOMC__ % 10)
+# endif
+
+#elif defined(__WATCOMC__)
+# define COMPILER_ID "OpenWatcom"
+ /* __WATCOMC__ = VVRP + 1100 */
+# define COMPILER_VERSION_MAJOR DEC((__WATCOMC__ - 1100) / 100)
+# define COMPILER_VERSION_MINOR DEC((__WATCOMC__ / 10) % 10)
+# if (__WATCOMC__ % 10) > 0
+# define COMPILER_VERSION_PATCH DEC(__WATCOMC__ % 10)
+# endif
+
+#elif defined(__SUNPRO_CC)
+# define COMPILER_ID "SunPro"
+# if __SUNPRO_CC >= 0x5100
+ /* __SUNPRO_CC = 0xVRRP */
+# define COMPILER_VERSION_MAJOR HEX(__SUNPRO_CC>>12)
+# define COMPILER_VERSION_MINOR HEX(__SUNPRO_CC>>4 & 0xFF)
+# define COMPILER_VERSION_PATCH HEX(__SUNPRO_CC & 0xF)
+# else
+ /* __SUNPRO_CC = 0xVRP */
+# define COMPILER_VERSION_MAJOR HEX(__SUNPRO_CC>>8)
+# define COMPILER_VERSION_MINOR HEX(__SUNPRO_CC>>4 & 0xF)
+# define COMPILER_VERSION_PATCH HEX(__SUNPRO_CC & 0xF)
+# endif
+
+#elif defined(__HP_aCC)
+# define COMPILER_ID "HP"
+ /* __HP_aCC = VVRRPP */
+# define COMPILER_VERSION_MAJOR DEC(__HP_aCC/10000)
+# define COMPILER_VERSION_MINOR DEC(__HP_aCC/100 % 100)
+# define COMPILER_VERSION_PATCH DEC(__HP_aCC % 100)
+
+#elif defined(__DECCXX)
+# define COMPILER_ID "Compaq"
+ /* __DECCXX_VER = VVRRTPPPP */
+# define COMPILER_VERSION_MAJOR DEC(__DECCXX_VER/10000000)
+# define COMPILER_VERSION_MINOR DEC(__DECCXX_VER/100000 % 100)
+# define COMPILER_VERSION_PATCH DEC(__DECCXX_VER % 10000)
+
+#elif defined(__IBMCPP__) && defined(__COMPILER_VER__)
+# define COMPILER_ID "zOS"
+ /* __IBMCPP__ = VRP */
+# define COMPILER_VERSION_MAJOR DEC(__IBMCPP__/100)
+# define COMPILER_VERSION_MINOR DEC(__IBMCPP__/10 % 10)
+# define COMPILER_VERSION_PATCH DEC(__IBMCPP__ % 10)
+
+#elif defined(__IBMCPP__) && !defined(__COMPILER_VER__) && __IBMCPP__ >= 800
+# define COMPILER_ID "XL"
+ /* __IBMCPP__ = VRP */
+# define COMPILER_VERSION_MAJOR DEC(__IBMCPP__/100)
+# define COMPILER_VERSION_MINOR DEC(__IBMCPP__/10 % 10)
+# define COMPILER_VERSION_PATCH DEC(__IBMCPP__ % 10)
+
+#elif defined(__IBMCPP__) && !defined(__COMPILER_VER__) && __IBMCPP__ < 800
+# define COMPILER_ID "VisualAge"
+ /* __IBMCPP__ = VRP */
+# define COMPILER_VERSION_MAJOR DEC(__IBMCPP__/100)
+# define COMPILER_VERSION_MINOR DEC(__IBMCPP__/10 % 10)
+# define COMPILER_VERSION_PATCH DEC(__IBMCPP__ % 10)
+
+#elif defined(__PGI)
+# define COMPILER_ID "PGI"
+# define COMPILER_VERSION_MAJOR DEC(__PGIC__)
+# define COMPILER_VERSION_MINOR DEC(__PGIC_MINOR__)
+# if defined(__PGIC_PATCHLEVEL__)
+# define COMPILER_VERSION_PATCH DEC(__PGIC_PATCHLEVEL__)
+# endif
+
+#elif defined(_CRAYC)
+# define COMPILER_ID "Cray"
+# define COMPILER_VERSION_MAJOR DEC(_RELEASE_MAJOR)
+# define COMPILER_VERSION_MINOR DEC(_RELEASE_MINOR)
+
+#elif defined(__TI_COMPILER_VERSION__)
+# define COMPILER_ID "TI"
+ /* __TI_COMPILER_VERSION__ = VVVRRRPPP */
+# define COMPILER_VERSION_MAJOR DEC(__TI_COMPILER_VERSION__/1000000)
+# define COMPILER_VERSION_MINOR DEC(__TI_COMPILER_VERSION__/1000 % 1000)
+# define COMPILER_VERSION_PATCH DEC(__TI_COMPILER_VERSION__ % 1000)
+
+#elif defined(__FUJITSU) || defined(__FCC_VERSION) || defined(__fcc_version)
+# define COMPILER_ID "Fujitsu"
+
+#elif defined(__SCO_VERSION__)
+# define COMPILER_ID "SCO"
+
+#elif defined(__clang__) && defined(__apple_build_version__)
+# define COMPILER_ID "AppleClang"
+# if defined(_MSC_VER)
+# define SIMULATE_ID "MSVC"
+# endif
+# define COMPILER_VERSION_MAJOR DEC(__clang_major__)
+# define COMPILER_VERSION_MINOR DEC(__clang_minor__)
+# define COMPILER_VERSION_PATCH DEC(__clang_patchlevel__)
+# if defined(_MSC_VER)
+ /* _MSC_VER = VVRR */
+# define SIMULATE_VERSION_MAJOR DEC(_MSC_VER / 100)
+# define SIMULATE_VERSION_MINOR DEC(_MSC_VER % 100)
+# endif
+# define COMPILER_VERSION_TWEAK DEC(__apple_build_version__)
+
+#elif defined(__clang__)
+# define COMPILER_ID "Clang"
+# if defined(_MSC_VER)
+# define SIMULATE_ID "MSVC"
+# endif
+# define COMPILER_VERSION_MAJOR DEC(__clang_major__)
+# define COMPILER_VERSION_MINOR DEC(__clang_minor__)
+# define COMPILER_VERSION_PATCH DEC(__clang_patchlevel__)
+# if defined(_MSC_VER)
+ /* _MSC_VER = VVRR */
+# define SIMULATE_VERSION_MAJOR DEC(_MSC_VER / 100)
+# define SIMULATE_VERSION_MINOR DEC(_MSC_VER % 100)
+# endif
+
+#elif defined(__GNUC__)
+# define COMPILER_ID "GNU"
+# define COMPILER_VERSION_MAJOR DEC(__GNUC__)
+# if defined(__GNUC_MINOR__)
+# define COMPILER_VERSION_MINOR DEC(__GNUC_MINOR__)
+# endif
+# if defined(__GNUC_PATCHLEVEL__)
+# define COMPILER_VERSION_PATCH DEC(__GNUC_PATCHLEVEL__)
+# endif
+
+#elif defined(_MSC_VER)
+# define COMPILER_ID "MSVC"
+ /* _MSC_VER = VVRR */
+# define COMPILER_VERSION_MAJOR DEC(_MSC_VER / 100)
+# define COMPILER_VERSION_MINOR DEC(_MSC_VER % 100)
+# if defined(_MSC_FULL_VER)
+# if _MSC_VER >= 1400
+ /* _MSC_FULL_VER = VVRRPPPPP */
+# define COMPILER_VERSION_PATCH DEC(_MSC_FULL_VER % 100000)
+# else
+ /* _MSC_FULL_VER = VVRRPPPP */
+# define COMPILER_VERSION_PATCH DEC(_MSC_FULL_VER % 10000)
+# endif
+# endif
+# if defined(_MSC_BUILD)
+# define COMPILER_VERSION_TWEAK DEC(_MSC_BUILD)
+# endif
+
+#elif defined(__VISUALDSPVERSION__) || defined(__ADSPBLACKFIN__) || defined(__ADSPTS__) || defined(__ADSP21000__)
+# define COMPILER_ID "ADSP"
+#if defined(__VISUALDSPVERSION__)
+ /* __VISUALDSPVERSION__ = 0xVVRRPP00 */
+# define COMPILER_VERSION_MAJOR HEX(__VISUALDSPVERSION__>>24)
+# define COMPILER_VERSION_MINOR HEX(__VISUALDSPVERSION__>>16 & 0xFF)
+# define COMPILER_VERSION_PATCH HEX(__VISUALDSPVERSION__>>8 & 0xFF)
+#endif
+
+#elif defined(__IAR_SYSTEMS_ICC__ ) || defined(__IAR_SYSTEMS_ICC)
+# define COMPILER_ID "IAR"
+
+#elif defined(__ARMCC_VERSION)
+# define COMPILER_ID "ARMCC"
+#if __ARMCC_VERSION >= 1000000
+ /* __ARMCC_VERSION = VRRPPPP */
+ # define COMPILER_VERSION_MAJOR DEC(__ARMCC_VERSION/1000000)
+ # define COMPILER_VERSION_MINOR DEC(__ARMCC_VERSION/10000 % 100)
+ # define COMPILER_VERSION_PATCH DEC(__ARMCC_VERSION % 10000)
+#else
+ /* __ARMCC_VERSION = VRPPPP */
+ # define COMPILER_VERSION_MAJOR DEC(__ARMCC_VERSION/100000)
+ # define COMPILER_VERSION_MINOR DEC(__ARMCC_VERSION/10000 % 10)
+ # define COMPILER_VERSION_PATCH DEC(__ARMCC_VERSION % 10000)
+#endif
+
+
+#elif defined(_SGI_COMPILER_VERSION) || defined(_COMPILER_VERSION)
+# define COMPILER_ID "MIPSpro"
+# if defined(_SGI_COMPILER_VERSION)
+ /* _SGI_COMPILER_VERSION = VRP */
+# define COMPILER_VERSION_MAJOR DEC(_SGI_COMPILER_VERSION/100)
+# define COMPILER_VERSION_MINOR DEC(_SGI_COMPILER_VERSION/10 % 10)
+# define COMPILER_VERSION_PATCH DEC(_SGI_COMPILER_VERSION % 10)
+# else
+ /* _COMPILER_VERSION = VRP */
+# define COMPILER_VERSION_MAJOR DEC(_COMPILER_VERSION/100)
+# define COMPILER_VERSION_MINOR DEC(_COMPILER_VERSION/10 % 10)
+# define COMPILER_VERSION_PATCH DEC(_COMPILER_VERSION % 10)
+# endif
+
+
+/* These compilers are either not known or too old to define an
+ identification macro. Try to identify the platform and guess that
+ it is the native compiler. */
+#elif defined(__sgi)
+# define COMPILER_ID "MIPSpro"
+
+#elif defined(__hpux) || defined(__hpua)
+# define COMPILER_ID "HP"
+
+#else /* unknown compiler */
+# define COMPILER_ID ""
+#endif
+
+/* Construct the string literal in pieces to prevent the source from
+ getting matched. Store it in a pointer rather than an array
+ because some compilers will just produce instructions to fill the
+ array rather than assigning a pointer to a static array. */
+char const* info_compiler = "INFO" ":" "compiler[" COMPILER_ID "]";
+#ifdef SIMULATE_ID
+char const* info_simulate = "INFO" ":" "simulate[" SIMULATE_ID "]";
+#endif
+
+#ifdef __QNXNTO__
+char const* qnxnto = "INFO" ":" "qnxnto[]";
+#endif
+
+#if defined(__CRAYXE) || defined(__CRAYXC)
+char const *info_cray = "INFO" ":" "compiler_wrapper[CrayPrgEnv]";
+#endif
+
+#define STRINGIFY_HELPER(X) #X
+#define STRINGIFY(X) STRINGIFY_HELPER(X)
+
+/* Identify known platforms by name. */
+#if defined(__linux) || defined(__linux__) || defined(linux)
+# define PLATFORM_ID "Linux"
+
+#elif defined(__CYGWIN__)
+# define PLATFORM_ID "Cygwin"
+
+#elif defined(__MINGW32__)
+# define PLATFORM_ID "MinGW"
+
+#elif defined(__APPLE__)
+# define PLATFORM_ID "Darwin"
+
+#elif defined(_WIN32) || defined(__WIN32__) || defined(WIN32)
+# define PLATFORM_ID "Windows"
+
+#elif defined(__FreeBSD__) || defined(__FreeBSD)
+# define PLATFORM_ID "FreeBSD"
+
+#elif defined(__NetBSD__) || defined(__NetBSD)
+# define PLATFORM_ID "NetBSD"
+
+#elif defined(__OpenBSD__) || defined(__OPENBSD)
+# define PLATFORM_ID "OpenBSD"
+
+#elif defined(__sun) || defined(sun)
+# define PLATFORM_ID "SunOS"
+
+#elif defined(_AIX) || defined(__AIX) || defined(__AIX__) || defined(__aix) || defined(__aix__)
+# define PLATFORM_ID "AIX"
+
+#elif defined(__sgi) || defined(__sgi__) || defined(_SGI)
+# define PLATFORM_ID "IRIX"
+
+#elif defined(__hpux) || defined(__hpux__)
+# define PLATFORM_ID "HP-UX"
+
+#elif defined(__HAIKU__)
+# define PLATFORM_ID "Haiku"
+
+#elif defined(__BeOS) || defined(__BEOS__) || defined(_BEOS)
+# define PLATFORM_ID "BeOS"
+
+#elif defined(__QNX__) || defined(__QNXNTO__)
+# define PLATFORM_ID "QNX"
+
+#elif defined(__tru64) || defined(_tru64) || defined(__TRU64__)
+# define PLATFORM_ID "Tru64"
+
+#elif defined(__riscos) || defined(__riscos__)
+# define PLATFORM_ID "RISCos"
+
+#elif defined(__sinix) || defined(__sinix__) || defined(__SINIX__)
+# define PLATFORM_ID "SINIX"
+
+#elif defined(__UNIX_SV__)
+# define PLATFORM_ID "UNIX_SV"
+
+#elif defined(__bsdos__)
+# define PLATFORM_ID "BSDOS"
+
+#elif defined(_MPRAS) || defined(MPRAS)
+# define PLATFORM_ID "MP-RAS"
+
+#elif defined(__osf) || defined(__osf__)
+# define PLATFORM_ID "OSF1"
+
+#elif defined(_SCO_SV) || defined(SCO_SV) || defined(sco_sv)
+# define PLATFORM_ID "SCO_SV"
+
+#elif defined(__ultrix) || defined(__ultrix__) || defined(_ULTRIX)
+# define PLATFORM_ID "ULTRIX"
+
+#elif defined(__XENIX__) || defined(_XENIX) || defined(XENIX)
+# define PLATFORM_ID "Xenix"
+
+#elif defined(__WATCOMC__)
+# if defined(__LINUX__)
+# define PLATFORM_ID "Linux"
+
+# elif defined(__DOS__)
+# define PLATFORM_ID "DOS"
+
+# elif defined(__OS2__)
+# define PLATFORM_ID "OS2"
+
+# elif defined(__WINDOWS__)
+# define PLATFORM_ID "Windows3x"
+
+# else /* unknown platform */
+# define PLATFORM_ID
+# endif
+
+#else /* unknown platform */
+# define PLATFORM_ID
+
+#endif
+
+/* For windows compilers MSVC and Intel we can determine
+ the architecture of the compiler being used. This is because
+ the compilers do not have flags that can change the architecture,
+ but rather depend on which compiler is being used
+*/
+#if defined(_WIN32) && defined(_MSC_VER)
+# if defined(_M_IA64)
+# define ARCHITECTURE_ID "IA64"
+
+# elif defined(_M_X64) || defined(_M_AMD64)
+# define ARCHITECTURE_ID "x64"
+
+# elif defined(_M_IX86)
+# define ARCHITECTURE_ID "X86"
+
+# elif defined(_M_ARM)
+# if _M_ARM == 4
+# define ARCHITECTURE_ID "ARMV4I"
+# elif _M_ARM == 5
+# define ARCHITECTURE_ID "ARMV5I"
+# else
+# define ARCHITECTURE_ID "ARMV" STRINGIFY(_M_ARM)
+# endif
+
+# elif defined(_M_MIPS)
+# define ARCHITECTURE_ID "MIPS"
+
+# elif defined(_M_SH)
+# define ARCHITECTURE_ID "SHx"
+
+# else /* unknown architecture */
+# define ARCHITECTURE_ID ""
+# endif
+
+#elif defined(__WATCOMC__)
+# if defined(_M_I86)
+# define ARCHITECTURE_ID "I86"
+
+# elif defined(_M_IX86)
+# define ARCHITECTURE_ID "X86"
+
+# else /* unknown architecture */
+# define ARCHITECTURE_ID ""
+# endif
+
+#else
+# define ARCHITECTURE_ID
+#endif
+
+/* Convert integer to decimal digit literals. */
+#define DEC(n) \
+ ('0' + (((n) / 10000000)%10)), \
+ ('0' + (((n) / 1000000)%10)), \
+ ('0' + (((n) / 100000)%10)), \
+ ('0' + (((n) / 10000)%10)), \
+ ('0' + (((n) / 1000)%10)), \
+ ('0' + (((n) / 100)%10)), \
+ ('0' + (((n) / 10)%10)), \
+ ('0' + ((n) % 10))
+
+/* Convert integer to hex digit literals. */
+#define HEX(n) \
+ ('0' + ((n)>>28 & 0xF)), \
+ ('0' + ((n)>>24 & 0xF)), \
+ ('0' + ((n)>>20 & 0xF)), \
+ ('0' + ((n)>>16 & 0xF)), \
+ ('0' + ((n)>>12 & 0xF)), \
+ ('0' + ((n)>>8 & 0xF)), \
+ ('0' + ((n)>>4 & 0xF)), \
+ ('0' + ((n) & 0xF))
+
+/* Construct a string literal encoding the version number components. */
+#ifdef COMPILER_VERSION_MAJOR
+char const info_version[] = {
+ 'I', 'N', 'F', 'O', ':',
+ 'c','o','m','p','i','l','e','r','_','v','e','r','s','i','o','n','[',
+ COMPILER_VERSION_MAJOR,
+# ifdef COMPILER_VERSION_MINOR
+ '.', COMPILER_VERSION_MINOR,
+# ifdef COMPILER_VERSION_PATCH
+ '.', COMPILER_VERSION_PATCH,
+# ifdef COMPILER_VERSION_TWEAK
+ '.', COMPILER_VERSION_TWEAK,
+# endif
+# endif
+# endif
+ ']','\0'};
+#endif
+
+/* Construct a string literal encoding the version number components. */
+#ifdef SIMULATE_VERSION_MAJOR
+char const info_simulate_version[] = {
+ 'I', 'N', 'F', 'O', ':',
+ 's','i','m','u','l','a','t','e','_','v','e','r','s','i','o','n','[',
+ SIMULATE_VERSION_MAJOR,
+# ifdef SIMULATE_VERSION_MINOR
+ '.', SIMULATE_VERSION_MINOR,
+# ifdef SIMULATE_VERSION_PATCH
+ '.', SIMULATE_VERSION_PATCH,
+# ifdef SIMULATE_VERSION_TWEAK
+ '.', SIMULATE_VERSION_TWEAK,
+# endif
+# endif
+# endif
+ ']','\0'};
+#endif
+
+/* Construct the string literal in pieces to prevent the source from
+ getting matched. Store it in a pointer rather than an array
+ because some compilers will just produce instructions to fill the
+ array rather than assigning a pointer to a static array. */
+char const* info_platform = "INFO" ":" "platform[" PLATFORM_ID "]";
+char const* info_arch = "INFO" ":" "arch[" ARCHITECTURE_ID "]";
+
+
+
+
+const char* info_language_dialect_default = "INFO" ":" "dialect_default["
+#if __cplusplus >= 201402L
+ "14"
+#elif __cplusplus >= 201103L
+ "11"
+#else
+ "98"
+#endif
+"]";
+
+/*--------------------------------------------------------------------------*/
+
+int main(int argc, char* argv[])
+{
+ int require = 0;
+ require += info_compiler[argc];
+ require += info_platform[argc];
+#ifdef COMPILER_VERSION_MAJOR
+ require += info_version[argc];
+#endif
+#ifdef SIMULATE_ID
+ require += info_simulate[argc];
+#endif
+#ifdef SIMULATE_VERSION_MAJOR
+ require += info_simulate_version[argc];
+#endif
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+message("Source Dir:" ${scream_SOURCE_DIR})
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+SET(LIBRARY_OUTPUT_PATH ${scream_SOURCE_DIR}/lib)
+SET(RUNTIME_OUTPUT_DIRECTORY ${scream_SOURCE_DIR}/bin)
+
+SET(scream_BIN ${scream_SOURCE_DIR}/bin)
+
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+
+IF(UNIX)
+add_definitions(-std=c++0x)
+ENDIF(UNIX)
+
+IF(WIN32)
+IF(MSVC12)
+message("Detected MSVC12 compiler")
+set(MSVC_VER VC12)
+ELSEIF(MSVC11)
+message("Detected MSVC11 compiler")
+set(MSVC_VER VC11)
+ELSEIF(MSVC10)
+message("Detected MSVC10 compiler")
+set(MSVC_VER VC10)
+ELSEIF(MSVC14)
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+endif( CMAKE_SIZEOF_VOID_P EQUAL 8 )
+
+SET(screamIncludes
+${scream_SOURCE_DIR}
+${scream_SOURCE_DIR}/code
+)
+
+message("screamIncludes directories:" ${screamIncludes})
+
+# lib directories
+IF(WIN32)
+SET(screamLink
+${scream_SOURCE_DIR}/../lib
+)
+ELSEIF(UNIX)
+SET(screamLink
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+/usr/local/lib
+/usr/lib
+)
+ENDIF(WIN32)
+
+SET(LibDir
+${scream_SOURCE_DIR}/../lib
+)
+
+message("LibDir directories:" ${LibDir})
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+# Include directories
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+)
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+ @echo "... edit_cache"
+ @echo "... scream_receiver"
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+ cd /home/robert/scream/scream_receiver && $(MAKE) -f code/CMakeFiles/scream_receiver.dir/build.make code/CMakeFiles/scream_receiver.dir/ScreamRx.cpp.i
+.PHONY : ScreamRx.cpp.i
+
+ScreamRx.s: ScreamRx.cpp.s
+
+.PHONY : ScreamRx.s
+
+# target to generate assembly for a file
+ScreamRx.cpp.s:
+ cd /home/robert/scream/scream_receiver && $(MAKE) -f code/CMakeFiles/scream_receiver.dir/build.make code/CMakeFiles/scream_receiver.dir/ScreamRx.cpp.s
+.PHONY : ScreamRx.cpp.s
+
+scream_receiver.o: scream_receiver.cpp.o
+
+.PHONY : scream_receiver.o
+
+# target to build an object file
+scream_receiver.cpp.o:
+ cd /home/robert/scream/scream_receiver && $(MAKE) -f code/CMakeFiles/scream_receiver.dir/build.make code/CMakeFiles/scream_receiver.dir/scream_receiver.cpp.o
+.PHONY : scream_receiver.cpp.o
+
+scream_receiver.i: scream_receiver.cpp.i
+
+.PHONY : scream_receiver.i
+
+# target to preprocess a source file
+scream_receiver.cpp.i:
+ cd /home/robert/scream/scream_receiver && $(MAKE) -f code/CMakeFiles/scream_receiver.dir/build.make code/CMakeFiles/scream_receiver.dir/scream_receiver.cpp.i
+.PHONY : scream_receiver.cpp.i
+
+scream_receiver.s: scream_receiver.cpp.s
+
+.PHONY : scream_receiver.s
+
+# target to generate assembly for a file
+scream_receiver.cpp.s:
+ cd /home/robert/scream/scream_receiver && $(MAKE) -f code/CMakeFiles/scream_receiver.dir/build.make code/CMakeFiles/scream_receiver.dir/scream_receiver.cpp.s
+.PHONY : scream_receiver.cpp.s
+
+# Help Target
+help:
+ @echo "The following are some of the valid targets for this Makefile:"
+ @echo "... all (the default if no target is provided)"
+ @echo "... clean"
+ @echo "... depend"
+ @echo "... rebuild_cache"
+ @echo "... edit_cache"
+ @echo "... scream_receiver"
+ @echo "... ScreamRx.o"
+ @echo "... ScreamRx.i"
+ @echo "... ScreamRx.s"
+ @echo "... scream_receiver.o"
+ @echo "... scream_receiver.i"
+ @echo "... scream_receiver.s"
+.PHONY : help
+
+
+
+#=============================================================================
+# Special targets to cleanup operation of make.
+
+# Special rule to run CMake to check the build system integrity.
+# No rule that depends on this can have commands that come from listfiles
+# because they might be regenerated.
+cmake_check_build_system:
+ cd /home/robert/scream/scream_receiver && $(CMAKE_COMMAND) -H$(CMAKE_SOURCE_DIR) -B$(CMAKE_BINARY_DIR) --check-build-system CMakeFiles/Makefile.cmake 0
+.PHONY : cmake_check_build_system
+
diff --git a/Laptop/scream/scream_receiver/code/ScreamRx.cpp b/Laptop/scream/scream_receiver/code/ScreamRx.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..8f43c821fa7c8c70ae092def39ea7ea6b20a0964
--- /dev/null
+++ b/Laptop/scream/scream_receiver/code/ScreamRx.cpp
@@ -0,0 +1,305 @@
+#include "ScreamRx.h"
+#include "ScreamTx.h"
+#ifdef _MSC_VER
+#define NOMINMAX
+#include <WinSock2.h>
+#else
+#include <arpa/inet.h>
+#endif
+#include <string.h>
+#include <climits>
+#include <algorithm>
+#include <iostream>
+using namespace std;
+
+
+ScreamRx::Stream::Stream(uint32_t ssrc_) {
+ ssrc = ssrc_;
+ ackVector = 0;
+ receiveTimestamp = 0x0;
+ highestSeqNr = 0x0;
+ highestSeqNrTx = 0x0;
+ lastFeedbackT_us = 0;
+ nRtpSinceLastRtcp = 0;
+ firstReceived = false;
+ ecnCeMarkedBytes = 0;
+}
+
+bool ScreamRx::Stream::checkIfFlushAck() {
+ int diff = highestSeqNr - highestSeqNrTx;
+ return (diff > (kAckVectorBits / 4));
+}
+
+void ScreamRx::Stream::receive(uint64_t time_us,
+ void* rtpPacket,
+ int size,
+ uint16_t seqNr,
+ bool isEcnCe) {
+ nRtpSinceLastRtcp++;
+ /*
+ * Make things wrap-around safe
+ */
+ if (firstReceived == false) {
+ highestSeqNr = seqNr;
+ highestSeqNr--;
+ firstReceived = true;
+ }
+
+ uint32_t seqNrExt = seqNr;
+ uint32_t highestSeqNrExt = highestSeqNr;
+ if (seqNr < highestSeqNr) {
+ if (highestSeqNr - seqNr > 16384)
+ seqNrExt += 65536;
+ }
+ if (highestSeqNr < seqNr) {
+ if (seqNr - highestSeqNr > 16384)
+ highestSeqNrExt += 65536;
+ }
+
+ /*
+ * Update the ACK vector that indicates receiption '=1' of RTP packets prior to
+ * the highest received sequence number.
+ * The next highest SN is indicated by the least significant bit,
+ * this means that for the first received RTP, the ACK vector is
+ * 0x0, for the second received RTP, the ACK vector it is 0x1, for the third 0x3 and so
+ * on, provided that no packets are lost.
+ * A 64 bit ACK vector means that it theory it is possible to send one feedback every
+ * 64 RTP packets, while this can possibly work at low bitrates, it is less likely to work
+ * at high bitrates because the ACK clocking in SCReAM is disturbed then.
+ */
+ if (seqNrExt >= highestSeqNrExt) {
+ /*
+ * Normal in-order reception
+ */
+ uint16_t diff = seqNrExt - highestSeqNrExt;
+ if (diff != 0) {
+ if (diff >= kAckVectorBits) {
+ ackVector = 0x0000;
+ }
+ else {
+ // Fill with potential zeros
+ ackVector = ackVector << diff;
+ // Add previous highest seq nr to ack vector
+ ackVector |= (INT64_C(1) << (diff - 1));
+ }
+ }
+ highestSeqNr = seqNr;
+ }
+ else {
+ /*
+ * Out-of-order reception
+ */
+ uint16_t diff = highestSeqNrExt - seqNrExt;
+ if (diff < kAckVectorBits) {
+ ackVector = ackVector | (INT64_C(1) << (diff - 1));
+ }
+ }
+ receiveTimestamp = (uint32_t)(time_us / 1000);
+
+ if (isEcnCe)
+ ecnCeMarkedBytes += size;
+}
+
+ScreamRx::ScreamRx(uint32_t ssrc_) {
+ lastFeedbackT_us = 0;
+ bytesReceived = 0;
+ lastRateComputeT_us = 0;
+ averageReceivedRate = 1e5;
+ rtcpFbInterval_us = 20000;
+ ssrc = ssrc_;
+ ix = 0;
+}
+
+bool ScreamRx::checkIfFlushAck() {
+ if (!streams.empty()) {
+ for (auto it = streams.begin(); it != streams.end(); ++it) {
+ if ((*it)->checkIfFlushAck())
+ return true;
+ }
+ }
+ return false;
+}
+
+void ScreamRx::receive(uint64_t time_us,
+ void* rtpPacket,
+ uint32_t ssrc,
+ int size,
+ uint16_t seqNr,
+ bool isEcnCe) {
+ bytesReceived += size;
+ if (lastRateComputeT_us == 0)
+ lastRateComputeT_us = time_us;
+
+ if (time_us - lastRateComputeT_us > 100000) {
+ /*
+ * Media rate computation (for all medias) is done at least every 100ms
+ * This is used for RTCP feedback rate calculation
+ */
+ float delta = (time_us - lastRateComputeT_us) * 1e-6f;
+ lastRateComputeT_us = time_us;
+ averageReceivedRate = std::max(0.95f*averageReceivedRate, bytesReceived * 8 / delta);
+ bytesReceived = 0;
+ /*
+ * The RTCP feedback rate depends on the received media date
+ * Target ~2% overhead but with feedback interval limited
+ * to the range [2ms,100ms]
+ */
+ float rate = 0.02*averageReceivedRate / (70.0f * 8.0f); // RTCP overhead
+ rate = std::min(500.0f, std::max(10.0f, rate));
+ /*
+ * More than one stream ?, increase the feedback rate as
+ * we currently don't bundle feedback packets
+ */
+ rate *= streams.size();
+ rtcpFbInterval_us = uint64_t(1000000.0f / rate);
+ }
+
+ if (!streams.empty()) {
+ for (auto it = streams.begin(); it != streams.end(); ++it) {
+ if ((*it)->isMatch(ssrc)) {
+ /*
+ * Packets for this SSRC received earlier
+ * stream is thus already in list
+ */
+ (*it)->receive(time_us, rtpPacket, size, seqNr, isEcnCe);
+ return;
+
+ }
+ }
+ }
+ /*
+ * New {SSRC,PT}
+ */
+ Stream *stream = new Stream(ssrc);
+ stream->ix = ix++;
+ stream->receive(time_us, rtpPacket, size, seqNr, isEcnCe);
+ streams.push_back(stream);
+}
+
+
+uint64_t ScreamRx::getRtcpFbInterval() {
+ return rtcpFbInterval_us;
+}
+
+bool ScreamRx::isFeedback(uint64_t time_us) {
+ if (!streams.empty()) {
+ for (auto it = streams.begin(); it != streams.end(); ++it) {
+ Stream *stream = (*it);
+ if (stream->nRtpSinceLastRtcp >= 1) {
+ return true;
+ }
+ }
+ }
+ return false;
+}
+
+int ScreamRx::getIx(uint32_t ssrc) {
+ if (!streams.empty()) {
+ for (auto it = streams.begin(); it != streams.end(); ++it) {
+ Stream *stream = (*it);
+ if (ssrc == stream->ssrc)
+ return stream->ix;
+ }
+ }
+ return -1;
+}
+
+bool ScreamRx::getFeedback(uint64_t time_us,
+ uint32_t &ssrc,
+ uint32_t &receiveTimestamp,
+ uint16_t &highestSeqNr,
+ uint64_t &ackVector,
+ uint16_t &ecnCeMarkedBytes) {
+
+ Stream *stream = NULL;
+ uint64_t minT_us = ULLONG_MAX;
+ for (auto it = streams.begin(); it != streams.end(); ++it) {
+ if ((*it)->nRtpSinceLastRtcp > 0 && (*it)->lastFeedbackT_us < minT_us) {
+ stream = *it;
+ minT_us = (*it)->lastFeedbackT_us;
+
+ }
+ }
+
+ if (stream == NULL)
+ return false;
+
+ receiveTimestamp = stream->receiveTimestamp;
+ highestSeqNr = stream->highestSeqNr;
+ stream->highestSeqNrTx = highestSeqNr;
+ ssrc = stream->ssrc;
+ ackVector = stream->ackVector;
+ ecnCeMarkedBytes = stream->ecnCeMarkedBytes;
+ stream->lastFeedbackT_us = time_us;
+ stream->nRtpSinceLastRtcp = 0;
+ lastFeedbackT_us = time_us;
+ return true;
+}
+
+/*
+* Create feedback according to the format below. It is up to the
+* wrapper application to prepend this RTCP with SR or RR when needed
+* BT = 255, means that this is experimental use
+* The code currently only handles one SSRC source per IP packet
+*
+* 0 1 2 3
+* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* |V=2|P|reserved | PT=XR=207 | length=6 |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | SSRC |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | BT=255 | reserved | block length=4 |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | SSRC of source |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | Highest recv. seq. nr. (16b) | ECN_CE_bytes |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | Ack vector (b0-31) |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | Ack vector (b32-63) |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | Timestamp (32bits) |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*/
+bool ScreamRx::createFeedback(uint64_t time_us, unsigned char *buf, int &size) {
+
+ if (!isFeedback(time_us))
+ return false;
+ uint32_t timeStamp;
+ uint16_t seqNr;
+ uint64_t ackVector;
+ uint16_t ecnCeMarkedBytes;
+ uint32_t ssrc_src;
+ size = 32;
+ if (getFeedback(time_us, ssrc_src, timeStamp, seqNr, ackVector, ecnCeMarkedBytes)) {
+ uint16_t tmp_s;
+ uint32_t tmp_l;
+ buf[0] = 0x80;
+ buf[1] = 207;
+ tmp_s = htons(6);
+ memcpy(buf + 2, &tmp_s, 2);
+ tmp_l = htonl(ssrc);
+ memcpy(buf + 4, &tmp_l, 4);
+ buf[8] = 0xFF; // BT=255
+ buf[9] = 0x00;
+ tmp_s = htons(4);
+ memcpy(buf + 10, &tmp_s, 2);
+ tmp_l = htonl(ssrc_src);
+ memcpy(buf + 12, &tmp_l, 4);
+ tmp_s = htons(seqNr);
+ memcpy(buf + 16, &tmp_s, 2);
+ tmp_s = htons(ecnCeMarkedBytes);
+ memcpy(buf + 18, &tmp_s, 2);
+ tmp_l = uint32_t((ackVector >> 32) & 0xFFFFFFFF);
+ tmp_l = htonl(tmp_l);
+ memcpy(buf + 20, &tmp_l, 4);
+ tmp_l = uint32_t(ackVector & 0xFFFFFFFF);
+ tmp_l = htonl(tmp_l);
+ memcpy(buf + 24, &tmp_l, 4);
+ tmp_l = htonl(timeStamp);
+ memcpy(buf + 28, &tmp_l, 4);
+ return true;
+ }
+ return false;
+}
diff --git a/Laptop/scream/scream_receiver/code/ScreamRx.h b/Laptop/scream/scream_receiver/code/ScreamRx.h
new file mode 100644
index 0000000000000000000000000000000000000000..f1d9e83c05b476833e82d926ca13d187f9d4179c
--- /dev/null
+++ b/Laptop/scream/scream_receiver/code/ScreamRx.h
@@ -0,0 +1,146 @@
+#ifndef SCREAM_RX
+#define SCREAM_RX
+#include <cstdint>
+#include <list>
+const int kAckVectorBits = 64;
+
+/*
+* This module implements the receiver side of SCReAM.
+* As SCReAM is a sender based congestion control, the receiver side is
+* actually dumber than dumb. In essense the only thing that it does is to
+* + Record receive time stamps and RTP sequence numbers for incoming RTP packets
+* + Generate RTCP feedback elements
+* + Calculate an appropriate RTCP feedback interval
+* See https://github.com/EricssonResearch/scream/blob/master/SCReAM-description.pdf
+* for details on how it is integrated in audio/video platforms.
+* A full implementation needs the additional code for
+* + RTCP feedback (e.g using RFC3611 XR elements)
+* + Other obvious stuff such as RTP payload depacketizer, video+audio deoders, rendering, dejitterbuffers
+* It is recommended that RTCP feedback for multiple streams are bundled in one RTCP packet.
+* However as low bitrate media (e.g audio) requires a lower feedback rate than high bitrate media (e.g video)
+* it is possible to include RTCP feedback for the audio stream more seldom. The code for this is T.B.D
+*/
+class ScreamRx {
+public:
+ ScreamRx(uint32_t ssrc); // SSRC of this RTCP session
+ /*
+ * One instance is created for each source SSRC
+ */
+ class Stream {
+ public:
+ Stream(uint32_t ssrc);
+
+ bool isMatch(uint32_t ssrc_) { return ssrc == ssrc_; };
+
+ bool checkIfFlushAck();
+ /*
+ * Receive RTP packet
+ */
+ void receive(uint64_t time_us,
+ void *rtpPacket,
+ int size,
+ uint16_t seqNr,
+ bool isEcnCe);
+
+ uint32_t ssrc; // SSRC of stream (source SSRC)
+ uint16_t highestSeqNr; // Highest received sequence number
+ uint16_t highestSeqNrTx; // Highest fed back sequence number
+ uint32_t receiveTimestamp; // Wall clock time
+ uint64_t ackVector; // List of received packets
+ uint16_t ecnCeMarkedBytes; // Number of ECN-CE marked bytes
+ // (i.e size of RTP packets with CE set in IP header)
+
+ uint64_t lastFeedbackT_us; // Last time feedback transmitted for
+ // this SSRC
+ int nRtpSinceLastRtcp; // Number of RTP packets since last transmitted RTCP
+
+ bool firstReceived;
+
+ float timeStampConversionFactor;
+
+ int ix;
+ };
+
+ /*
+ * Check to ensure that ACK vector can cover also large holes in
+ * in the received sequence number space. These cases can frequently occur when
+ * SCReAM is used in frame discard mode i.e. when real video rate control is
+ * not possible
+ */
+ bool checkIfFlushAck();
+
+ /*
+ * Function is called each time an RTP packet is received
+ */
+ void receive(uint64_t time_us,
+ void* rtpPacket,
+ uint32_t ssrc,
+ int size,
+ uint16_t seqNr,
+ bool isEcnCe = false);
+
+ /*
+ * Return TRUE if an RTP packet has been received and there is
+ * pending feedback
+ */
+ bool isFeedback(uint64_t time_us);
+
+ uint64_t getRtcpFbInterval();
+
+ /*
+ * Get SCReAM RTCP feedback elements
+ * return FALSE if no pending feedback available
+ */
+ bool getFeedback(uint64_t time_us,
+ uint32_t &ssrc,
+ uint32_t &receiveTimestamp,
+ uint16_t &highestSeqNr,
+ uint64_t &ackVector,
+ uint16_t &ecnCeMarkedBytes);
+
+ /*
+ * Create feedback according to the format below. It is up to the
+ * wrapper application to prepend this RTCP with SR or RR when needed
+ * BT = 255, means that this is experimental use
+ *
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |V=2|P|reserved | PT=XR=207 | length=6 |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | SSRC |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | BT=255 | reserved | block length=4 |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | SSRC of source |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Highest recv. seq. nr. (16b) | ECN_CE_bytes |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Ack vector (b0-31) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Ack vector (b32-63) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Timestamp (32bits) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+ bool createFeedback(uint64_t time_us, unsigned char *buf, int &size);
+
+ uint64_t getLastFeedbackT() { return lastFeedbackT_us; };
+
+ uint64_t lastFeedbackT_us;
+ int bytesReceived;
+ uint64_t lastRateComputeT_us;
+ float averageReceivedRate;
+ uint64_t rtcpFbInterval_us;
+ uint32_t ssrc;
+
+ int getIx(uint32_t ssrc);
+ int ix;
+
+ /*
+ * Variables for multiple steams handling
+ */
+ std::list<Stream*> streams;
+};
+
+#endif
diff --git a/Laptop/scream/scream_receiver/code/ScreamTx.cpp b/Laptop/scream/scream_receiver/code/ScreamTx.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..9017d690d327646c64bd6f0a3edb131dae11170f
--- /dev/null
+++ b/Laptop/scream/scream_receiver/code/ScreamTx.cpp
@@ -0,0 +1,1859 @@
+#include "RtpQueue.h"
+#include "ScreamTx.h"
+#include "ScreamRx.h"
+#ifdef _MSC_VER
+#define NOMINMAX
+#include <winSock2.h>
+#else
+#include <arpa/inet.h>
+#endif
+#include <cstdint>
+#include <cmath>
+#include <string.h>
+#include <iostream>
+#include <algorithm>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+// === Some good to have features, SCReAM works also
+// with these disabled
+// Fast start can resume if little or no congestion detected
+static const bool kEnableConsecutiveFastStart = true;
+// Packet pacing reduces jitter
+static const bool kEnablePacketPacing = true;
+static const float kPacketPacingHeadRoom = 1.25f;
+
+// Rate update interval
+static const uint64_t kRateAdjustInterval_us = 200000; // 200ms
+
+// ==== Less important tuning parameters ====
+// Min pacing interval and min pacing rate
+static const float kMinPaceInterval = 0.000f;
+static const float kMinimumBandwidth = 5000.0f; // bps
+// Initial MSS, this is set quite low in order to make it possible to
+// use SCReAM with audio only
+static const int kInitMss = 100;
+
+// Min and max queue delay target
+static const float kQueueDelayTargetMax = 0.3f; //ms
+
+// Congestion window validation
+static const float kBytesInFlightHistInterval_us = 1000000; // Time (s) between stores 1s
+static const float kMaxBytesInFlightHeadRoom = 1.1f;
+// Queue delay trend and shared bottleneck detection
+static const uint64_t kQueueDelayFractionHistInterval_us = 50000; // 50ms
+// video rate estimation update period
+static const uint64_t kRateUpdateInterval_us = 50000; // 50ms
+
+// Packet reordering margin (us)
+static const uint64_t kReorderTime_us = 20000;
+static const uint64_t kMinRtpQueueDiscardInterval_us = 1000000;
+
+// Update interval for base delay history
+static const uint64_t kBaseDelayUpdateInterval_us = 10000000;
+
+// Min CWND in MSS
+static int kMinCwndMss = 3;
+
+ScreamTx::ScreamTx(float lossBeta_,
+ float ecnCeBeta_,
+ float queueDelayTargetMin_,
+ bool enableSbd_,
+ float gainUp_,
+ float gainDown_,
+ int cwnd_,
+ float cautiousPacing_,
+ int bytesInFlightHistSize_,
+ bool openWindow_
+ )
+ : sRttSh_us(0),
+ lossBeta(lossBeta_),
+ ecnCeBeta(ecnCeBeta_),
+ queueDelayTargetMin(queueDelayTargetMin_),
+ enableSbd(enableSbd_),
+ gainUp(gainUp_),
+ gainDown(gainDown_),
+ cautiousPacing(cautiousPacing_),
+ bytesInFlightHistSize(bytesInFlightHistSize_),
+ openWindow(openWindow_),
+ sRtt_us(0),
+ sRtt(0.0f),
+ ackedOwd(0),
+ baseOwd(UINT32_MAX),
+ queueDelay(0.0),
+ queueDelayFractionAvg(0.0),
+ queueDelayTrend(0.0),
+ queueDelayTarget(queueDelayTargetMin),
+ queueDelaySbdVar(0.0),
+ queueDelaySbdMean(0.0),
+ queueDelaySbdMeanSh(0.0),
+
+ bytesNewlyAcked(0),
+ mss(kInitMss),
+ cwnd(kInitMss * 2),
+ cwndMin(kInitMss * 2),
+ lastBytesInFlightT_us(0),
+ bytesInFlightMaxLo(0),
+ bytesInFlightMaxHi(0),
+ bytesInFlightHistLoMem(0),
+ bytesInFlightHistHiMem(0),
+ maxBytesInFlight(0.0f),
+
+ lossEvent(false),
+ wasLossEvent(false),
+ lossEventRate(0.0),
+ ecnCeEvent(false),
+
+ inFastStart(true),
+
+ paceInterval_us(0),
+ paceInterval(0.0),
+ rateTransmittedAvg(0.0),
+
+ isInitialized(false),
+ lastSRttUpdateT_us(0),
+ lastBaseOwdAddT_us(0),
+ baseOwdResetT_us(0),
+ lastAddToQueueDelayFractionHistT_us(0),
+ lastLossEventT_us(0),
+ lastTransmitT_us(0),
+ nextTransmitT_us(0),
+ lastRateUpdateT_us(0),
+ accBytesInFlightMax(0),
+ nAccBytesInFlightMax(0),
+ rateTransmitted(0.0f),
+ rateAcked(0.0f),
+ queueDelayTrendMem(0.0f),
+ lastCwndUpdateT_us(0),
+ bytesInFlight(0),
+ lastBaseDelayRefreshT_us(0),
+ maxRate(0.0f),
+ baseOwdHistMin(UINT32_MAX)
+{
+ if (cwnd_ == 0) {
+ cwnd = kInitMss * 2;
+ }
+ else {
+ cwnd = cwnd_;
+ }
+ if (openWindow) {
+ cwndMin = 10000000;
+ cwnd = cwndMin;
+ }
+
+ for (int n = 0; n < kBaseOwdHistSize; n++)
+ baseOwdHist[n] = UINT32_MAX;
+ baseOwdHistPtr = 0;
+ for (int n = 0; n < kQueueDelayFractionHistSize; n++)
+ queueDelayFractionHist[n] = 0.0f;
+ queueDelayFractionHistPtr = 0;
+ for (int n = 0; n < kQueueDelayNormHistSize; n++)
+ queueDelayNormHist[n] = 0.0f;
+ queueDelayNormHistPtr = 0;
+ for (int n = 0; n < kBytesInFlightHistSizeMax; n++) {
+ bytesInFlightHistLo[n] = 0;
+ bytesInFlightHistHi[n] = 0;
+ }
+ bytesInFlightHistPtr = 0;
+ nStreams = 0;
+ for (int n = 0; n < kMaxStreams; n++)
+ streams[n] = NULL;
+
+ queueDelayMax = 0.0f;
+ queueDelayMinAvg = 0.0f;
+ queueDelayMin = 1000.0;
+
+ statistics = new Statistics();
+}
+
+ScreamTx::~ScreamTx() {
+ for (int n = 0; n < nStreams; n++)
+ delete streams[n];
+ delete statistics;
+}
+
+ScreamTx::Statistics::Statistics() {
+ sumRateTx = 0.0f;
+ sumRateLost = 0.0f;
+ avgRateTx = 0.0f;
+ avgRtt = 0.0f;
+ avgQueueDelay = 0.0f;
+ rateLostAcc = 0.0f;
+ rateLostN = 0;
+ for (int n = 0; n < kLossRateHistSize; n++) {
+ lossRateHist[n] = 0.0f;
+ }
+ lossRateHistPtr = 0;
+}
+
+void ScreamTx::Statistics::add(float rateTx, float rateLost, float rtt, float queueDelay) {
+ const float alpha = 0.98f;
+ sumRateTx += rateTx;
+ sumRateLost += rateLost;
+ if (avgRateTx == 0.0f) {
+ avgRateTx = rateTx;
+ avgRtt = rtt;
+ avgQueueDelay = queueDelay;
+ }
+ else {
+ avgRateTx = alpha*avgRateTx + (1.0f - alpha)*rateTx;
+ rateLostAcc += rateLost;
+ rateLostN++;
+ if (rateLostN == 10) {
+ rateLostAcc /= 10;
+ rateLostN = 0;
+ float lossRate = 0.0f;
+ if (rateTx > 0)
+ lossRate = rateLostAcc / rateTx*100.0f;
+ lossRateHist[lossRateHistPtr] = lossRate;
+ lossRateHistPtr = (lossRateHistPtr + 1) % kLossRateHistSize;
+ }
+ avgRtt = alpha*avgRtt + (1.0f - alpha)*rtt;
+ avgQueueDelay = alpha*avgQueueDelay + (1.0f - alpha)*queueDelay;
+ }
+}
+
+void ScreamTx::Statistics::getSummary(float time, char s[]) {
+ float lossRate = 0.0f;
+ for (int n = 0; n < kLossRateHistSize; n++)
+ lossRate += lossRateHist[n];
+ lossRate /= kLossRateHistSize;
+ float lossRateLong = 0.0f;
+ if (sumRateTx > 100000.0f) {
+ lossRateLong = sumRateLost / sumRateTx*100.0f;
+ }
+ sprintf(s, "%5.1f Transmit rate = %5.0fkbps, PLR = %5.2f%%(%5.2f%%), RTT = %5.3fs, Queue delay = %5.3fs",
+ time,
+ avgRateTx / 1000.0f,
+ lossRate,
+ lossRateLong,
+ avgRtt,
+ avgQueueDelay);
+}
+
+/*
+* Register new stream
+*/
+void ScreamTx::registerNewStream(RtpQueueIface *rtpQueue,
+ uint32_t ssrc,
+ float priority,
+ float minBitrate,
+ float startBitrate,
+ float maxBitrate,
+ float rampUpSpeed,
+ float maxRtpQueueDelay,
+ float txQueueSizeFactor,
+ float queueDelayGuard,
+ float lossEventRateScale,
+ float ecnCeEventRateScale) {
+ Stream *stream = new Stream(this,
+ rtpQueue,
+ ssrc,
+ priority,
+ minBitrate,
+ startBitrate,
+ maxBitrate,
+ rampUpSpeed,
+ maxRtpQueueDelay,
+ txQueueSizeFactor,
+ queueDelayGuard,
+ lossEventRateScale,
+ ecnCeEventRateScale);
+ streams[nStreams++] = stream;
+}
+
+void ScreamTx::updateBitrateStream(uint32_t ssrc,
+ float minBitrate,
+ float maxBitrate) {
+ Stream *stream = getStream(ssrc);
+ stream->minBitrate = minBitrate;
+ stream->maxBitrate = maxBitrate;
+}
+
+RtpQueueIface * ScreamTx::getStreamQueue(uint32_t ssrc) {
+ Stream* stream = getStream(ssrc);
+ return stream->rtpQueue;
+}
+
+
+/*
+* New media frame
+*/
+void ScreamTx::newMediaFrame(uint64_t time_us, uint32_t ssrc, int bytesRtp) {
+ if (!isInitialized) initialize(time_us);
+
+ Stream *stream = getStream(ssrc);
+ stream->updateTargetBitrate(time_us);
+ if (time_us - lastCwndUpdateT_us < 500000) {
+ /*
+ * We expect feedback at least every 500ms
+ * to update the target rate.
+ */
+ stream->updateTargetBitrate(time_us);
+ }
+ if (time_us - lastBaseDelayRefreshT_us < sRtt_us * 2) {
+ /*
+ * _Very_ long periods of congestion can cause the base delay to increase
+ * with the effect that the queue delay is estimated wrong, therefore we seek to
+ * refresh the whole thing by deliberately allowing the network queue to drain
+ * Clear the RTP queue for 2 RTTs, this will allow the queue to drain so that we
+ * get a good estimate for the min queue delay.
+ * This funtion is executed very seldom so it should not affect overall experience too much
+ */
+ stream->rtpQueue->clear();
+ }
+ else {
+ stream->bytesRtp += bytesRtp;
+ /*
+ * Need to update MSS here, otherwise it will be nearly impossible to
+ * transmit video packets, this because of the small initial MSS
+ * which is necessary to make SCReAM work with audio only
+ */
+ int sizeOfNextRtp = stream->rtpQueue->sizeOfNextRtp();
+ mss = std::max(mss, sizeOfNextRtp);
+ if (!openWindow)
+ cwndMin = 2 * mss;
+ cwnd = max(cwnd, cwndMin);
+ }
+}
+
+/*
+* Determine if OK to transmit RTP packet
+*/
+float ScreamTx::isOkToTransmit(uint64_t time_us, uint32_t &ssrc) {
+ if (!isInitialized) initialize(time_us);
+ /*
+ * Update rateTransmitted and rateAcked if time for it
+ * This is used in video rate computation
+ * The update interval is doubled at very low bitrates,
+ * the reason is that the feedback interval is very low then and
+ * a longer window is needed to avoid aliasing effects
+ */
+ uint64_t tmp = kRateUpdateInterval_us;
+
+ if (rateAcked < 50000.0f) {
+ tmp *= 2;
+ }
+
+ if (time_us - lastRateUpdateT_us > tmp) {
+ rateTransmitted = 0.0;
+ rateAcked = 0.0;
+ for (int n = 0; n < nStreams; n++) {
+ streams[n]->updateRate(time_us);
+ rateTransmitted += streams[n]->rateTransmitted;
+ rateTransmittedAvg = 0.8*rateTransmittedAvg + 0.2*rateTransmitted;
+ rateAcked += streams[n]->rateAcked;
+ if (n == 0)
+ statistics->add(streams[0]->rateTransmitted, streams[0]->rateLost, sRtt, queueDelay);
+ }
+ lastRateUpdateT_us = time_us;
+ /*
+ * Adjust stream priorities
+ */
+ adjustPriorities(time_us);
+
+ /*
+ * Update maxRate
+ */
+ maxRate = 0.0f;
+ for (int n = 0; n < nStreams; n++)
+ maxRate += streams[n]->getMaxRate();
+ }
+
+ /*
+ * Get index to the prioritized RTP queue
+ */
+ Stream* stream = getPrioritizedStream(time_us);
+
+ if (stream == NULL)
+ /*
+ * No RTP packets to transmit
+ */
+ return -1.0f;
+ ssrc = stream->ssrc;
+
+ bytesInFlightMaxHi = std::max(bytesInFlight, bytesInFlightMaxHi);
+
+ /*
+ * Update bytes in flight history for congestion window validation
+ */
+ if (time_us - lastBytesInFlightT_us > kBytesInFlightHistInterval_us) {
+ bytesInFlightMaxLo = 0;
+ if (nAccBytesInFlightMax > 0) {
+ bytesInFlightMaxLo = accBytesInFlightMax / nAccBytesInFlightMax;
+ }
+ bytesInFlightHistLo[bytesInFlightHistPtr] = bytesInFlightMaxLo;
+ bytesInFlightHistHi[bytesInFlightHistPtr] = bytesInFlightMaxHi;
+ bytesInFlightHistPtr = (bytesInFlightHistPtr + 1) % bytesInFlightHistSize;
+ lastBytesInFlightT_us = time_us;
+ accBytesInFlightMax = 0;
+ nAccBytesInFlightMax = 0;
+ bytesInFlightMaxHi = 0;
+ bytesInFlightHistLoMem = 0;
+ bytesInFlightHistHiMem = 0;
+ for (int n = 0; n < bytesInFlightHistSize; n++) {
+ bytesInFlightHistLoMem = std::max(bytesInFlightHistLoMem, bytesInFlightHistLo[n]);
+ bytesInFlightHistHiMem = std::max(bytesInFlightHistHiMem, bytesInFlightHistHi[n]);
+ }
+
+ /*
+ * In addition, reset MSS, this is useful in case for instance
+ * a video stream is put on hold, leaving only audio packets to be
+ * transmitted
+ */
+ mss = kInitMss;
+ if (!openWindow)
+ cwndMin = kMinCwndMss * mss;
+ cwnd = max(cwnd, cwndMin);
+ }
+
+ int sizeOfNextRtp = stream->rtpQueue->sizeOfNextRtp();
+ if (sizeOfNextRtp == -1){
+ return -1.0f;
+ }
+ /*
+ * Determine if window is large enough to transmit
+ * an RTP packet
+ */
+ bool exit = false;
+ if (queueDelay < queueDelayTarget)
+ exit = (bytesInFlight + sizeOfNextRtp) > cwnd + mss;
+ else
+ exit = (bytesInFlight + sizeOfNextRtp) > cwnd;
+ /*
+ * Enforce packet pacing
+ */
+ float retVal = 0.0f;
+ if (kEnablePacketPacing && nextTransmitT_us > time_us){
+ retVal = (nextTransmitT_us - time_us) * 1e-6f;
+ }
+
+ /*
+ * A retransmission time out mechanism to avoid deadlock
+ */
+ if (time_us - lastTransmitT_us > 500000 && lastTransmitT_us < time_us) { // 200ms
+ for (int n = 0; n < kMaxTxPackets; n++) {
+ stream->txPackets[n].isUsed = false;
+ }
+ bytesInFlight = 0;
+ exit = false;
+ retVal = 0.0f;
+ }
+
+ if (!exit) {
+ /*
+ * Return value 0.0 = RTP packet can be immediately transmitted
+ */
+ return retVal;
+ }
+
+ return -1.0f;
+}
+
+/*
+* RTP packet transmitted
+*/
+float ScreamTx::addTransmitted(uint64_t time_us,
+ uint32_t ssrc,
+ int size,
+ uint16_t seqNr) {
+ if (!isInitialized)
+ initialize(time_us);
+
+ Stream *stream = getStream(ssrc);
+
+ int ix = seqNr % kMaxTxPackets;
+ Transmitted *txPacket = &(stream->txPackets[ix]);
+ if (txPacket->isUsed) {
+ /*
+ * This event should occur quite rarely.
+ * The most likely reason is that thoughput has dropped
+ * considerably.
+ * Therefore we clean the list and set cwnd and bitrate low
+ */
+ for (int n = 0; n < kMaxTxPackets; n++) {
+ stream->txPackets[n].isUsed = false;
+ }
+ bytesInFlight = 0;//-= txPacket->size;
+ cwnd = cwndMin;
+ stream->targetBitrate = stream->minBitrate;
+ }
+ stream->hiSeqTx = seqNr;
+ txPacket->timestamp = (uint32_t)(time_us / 1000);
+ txPacket->timeTx_us = time_us;
+ txPacket->size = size;
+ txPacket->seqNr = seqNr;
+ txPacket->isUsed = true;
+ txPacket->isAcked = false;
+ txPacket->isAfterReceivedEdge = false;
+
+ /*
+ * Update bytesInFlight
+ */
+ bytesInFlight += size;
+
+ stream->bytesTransmitted += size;
+ lastTransmitT_us = time_us;
+ /*
+ * Add credit to unserved streams
+ */
+ addCredit(time_us, stream, size);
+ /*
+ * Reduce used credit for served stream
+ */
+ subtractCredit(time_us, stream, size);
+
+ /*
+ * Update MSS and cwndMin
+ */
+ mss = std::max(mss, size);
+ if (!openWindow)
+ cwndMin = 2 * mss;
+ cwnd = max(cwnd, cwndMin);
+
+ /*
+ * Determine when next RTP packet can be transmitted
+ */
+ if (kEnablePacketPacing)
+ nextTransmitT_us = time_us + paceInterval_us;
+ else
+ nextTransmitT_us = time_us;
+
+ return paceInterval;
+}
+
+/*
+* Parse feedback according to the format below. It is up to the
+* wrapper application this RTCP from a compound RTCP if needed
+* BT = 255, means that this is experimental use.
+* The code currently only handles one SSRC source per IP packet
+*
+* 0 1 2 3
+* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* |V=2|P|reserved | PT=XR=207 | length=6 |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | SSRC |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | BT=255 | reserved | block length=4 |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | SSRC of source |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | Highest recv. seq. nr. (16b) | ECN_CE_bytes |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | Ack vector (b0-31) |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | Ack vector (b32-63) |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | Timestamp (32bits) |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*/
+void ScreamTx::incomingFeedback(uint64_t time_us,
+ unsigned char* buf,
+ int size) {
+ if (!(size == 32 && buf[0] == 0x80 && buf[1] == 207 && buf[8] == 255)) {
+ // This does not seem as a valid size, exit function
+ return;
+ }
+ uint32_t tmp_l_1;
+ uint16_t tmp_s;
+ uint32_t tmp_l_2;
+ uint32_t timeStamp;
+ uint16_t seqNr;
+ uint64_t ackVector;
+ uint16_t ecnCeMarkedBytes;
+ uint32_t ssrc;
+ uint16_t rawSeq;
+ memcpy(&tmp_l_1, buf + 12, 4);
+ ssrc = ntohl(tmp_l_1);
+ memcpy(&seqNr, buf + 16, 2);
+ seqNr = ntohs(seqNr);
+ memcpy(&ecnCeMarkedBytes, buf + 18, 2);
+ ecnCeMarkedBytes = ntohs(ecnCeMarkedBytes);
+ memcpy(&tmp_l_1, buf + 20, 4);
+ memcpy(&tmp_l_2, buf + 24, 4);
+ tmp_l_1 = ntohl(tmp_l_1);
+ tmp_l_2 = ntohl(tmp_l_2);
+ ackVector = ((uint64_t(tmp_l_1)) << 32) | tmp_l_2;
+ memcpy(&timeStamp, buf + 28, 4);
+ timeStamp = ntohl(timeStamp);
+ incomingFeedback(time_us, ssrc, timeStamp, seqNr, ackVector, ecnCeMarkedBytes);
+}
+/*
+* New incoming feedback
+*/
+void ScreamTx::incomingFeedback(uint64_t time_us,
+ uint32_t ssrc,
+ uint32_t timestamp,
+ uint16_t highestSeqNr,
+ uint64_t ackVector,
+ uint16_t ecnCeMarkedBytes) {
+
+ if (!isInitialized) initialize(time_us);
+ Stream *stream = getStream(ssrc);
+ if (stream == 0) {
+ // Bogus RTCP?, the SSRC is wrong anyway, Skip
+ return;
+ }
+
+ uint16_t diff = highestSeqNr - stream->hiSeqAck;
+ if (diff > 65000 && stream->hiSeqAck != 0 && stream->timeTxAck_us != 0) {
+ /*
+ * Out of order received ACKs are ignored
+ */
+ return;
+ }
+ accBytesInFlightMax += bytesInFlight;
+ nAccBytesInFlightMax++;
+ Transmitted *txPackets = stream->txPackets;
+ /*
+ * Mark received packets, given by the ACK vector
+ */
+ markAcked(time_us, txPackets, highestSeqNr, ackVector, timestamp, stream);
+
+ /*
+ * Detect lost pakcets
+ */
+ detectLoss(time_us, txPackets, highestSeqNr, stream);
+
+ if (ecnCeMarkedBytes != stream->ecnCeMarkedBytes && time_us - lastLossEventT_us > sRtt_us) {
+ ecnCeEvent = true;
+ lastLossEventT_us = time_us;
+ }
+ stream->ecnCeMarkedBytes = ecnCeMarkedBytes;
+
+ if (lossEvent || ecnCeEvent) {
+ lastLossEventT_us = time_us;
+ for (int n = 0; n < nStreams; n++) {
+ Stream *tmp = streams[n];
+ if (lossEvent)
+ tmp->lossEventFlag = true;
+ else
+ tmp->ecnCeEventFlag = true;
+ }
+ }
+
+ if (lastCwndUpdateT_us == 0)
+ lastCwndUpdateT_us = time_us;
+
+ if (time_us - lastCwndUpdateT_us > 10000) {
+ /*
+ * There is no gain with a too frequent CWND update
+ * An update every 10ms is fast enough even at very high high bitrates
+ */
+ updateCwnd(time_us);
+ lastCwndUpdateT_us = time_us;
+ }
+}
+
+/*
+* Mark ACKed RTP packets
+*/
+void ScreamTx::markAcked(uint64_t time_us, struct Transmitted *txPackets, uint16_t highestSeqNr, uint64_t ackVector, uint32_t timestamp, Stream *stream) {
+ /*
+ * Loop only through the packets that are covered by the last highest ACK, this saves complexity
+ */
+ int ix1 = highestSeqNr; ix1 = ix1 % kMaxTxPackets;
+ int ix0 = stream->hiSeqAck + 1;
+ if (ix0 < 0) ix0 += kMaxTxPackets;
+ while (ix1 < ix0)
+ ix1 += kMaxTxPackets;
+ for (int m = ix0; m <= ix1; m++) {
+ int n = m % kMaxTxPackets;
+ /*
+ * Loop through TX packets
+ */
+ if (txPackets[n].isUsed) {
+ /*
+ * RTP packet is in flight
+ */
+ Transmitted *tmp = &txPackets[n];
+
+ /*
+ * Compute SN difference
+ */
+ uint16_t diff = highestSeqNr - tmp->seqNr;
+ diff -= 1;
+
+ if (diff <= kAckVectorBits) {
+ if (ackVector & (INT64_C(1) << diff)) {
+ /*
+ * SN marked as received
+ */
+ tmp->isAcked = true;
+ }
+ }
+
+ /*
+ * Receiption of packet given by highestSeqNr
+ */
+ if (tmp->seqNr == highestSeqNr) {
+ tmp->isAcked = true;
+ ackedOwd = timestamp - tmp->timestamp;
+ /*
+ * Compute the queue delay
+ */
+ uint32_t qDel = estimateOwd(time_us);
+ qDel -= getBaseOwd();
+
+ /*
+ * Convert from [jiffy] OWD to an OWD in [s]
+ */
+ queueDelay = qDel / kTimestampRate;
+
+ uint64_t rtt = time_us - tmp->timeTx_us;
+
+ sRttSh_us = (7 * sRttSh_us + rtt) / 8;
+ if (time_us - lastSRttUpdateT_us > sRttSh_us) {
+ sRtt_us = (7 * sRtt_us + sRttSh_us) / 8;
+ lastSRttUpdateT_us = time_us;
+ sRtt = sRtt_us*1e-6f;
+ }
+ stream->timeTxAck_us = tmp->timeTx_us;
+ }
+ }
+ }
+}
+
+/*
+* Detect lost RTP packets
+*/
+void ScreamTx::detectLoss(uint64_t time_us, struct Transmitted *txPackets, uint16_t highestSeqNr, Stream *stream) {
+ /*
+ * Loop only through the packets that are covered by the last highest ACK, this saves complexity
+ * There is a faint possibility that we miss to detect large bursts of lost packets with this fix
+ */
+ int ix1 = highestSeqNr; ix1 = ix1 % kMaxTxPackets;
+ int ix0 = stream->hiSeqAck + 1;
+ stream->hiSeqAck = highestSeqNr;
+ if (ix0 < 0) ix0 += kMaxTxPackets;
+ while (ix1 < ix0)
+ ix1 += kMaxTxPackets;
+
+ /*
+ * Mark packets outside the 64 bit ACK vector range as forever lost
+ */
+ if (stream->lastLossDetectIx >= 0) {
+ int ix0_ = ix0;
+ if (stream->lastLossDetectIx > ix0_) ix0_ += kMaxTxPackets;
+ for (int m = stream->lastLossDetectIx; m < ix0_; m++) {
+ int n = m % kMaxTxPackets;
+ if (txPackets[n].isUsed) {
+ Transmitted *tmp = &txPackets[n];
+ if (time_us - lastLossEventT_us > sRtt_us && lossBeta < 1.0f) {
+ lossEvent = true;
+ }
+ stream->bytesLost += tmp->size;
+ tmp->isUsed = false;
+ stream->repairLoss = true;
+ }
+ }
+ }
+ stream->lastLossDetectIx = ix0;
+
+ /*
+ * Mark late packets as lost
+ */
+ for (int m = ix0; m <= ix1; m++) {
+ int n = m % kMaxTxPackets;
+ /*
+ * Loop through TX packets
+ */
+ if (txPackets[n].isUsed) {
+ Transmitted *tmp = &txPackets[n];
+ /*
+ * RTP packet is in flight
+ */
+ /*
+ * Wrap-around safety net
+ */
+ uint32_t seqNrExt = tmp->seqNr;
+ uint32_t highestSeqNrExt = highestSeqNr;
+ if (seqNrExt < highestSeqNrExt && highestSeqNrExt - seqNrExt > 20000)
+ seqNrExt += 65536;
+ else if (seqNrExt > highestSeqNrExt && seqNrExt - highestSeqNrExt > 20000)
+ highestSeqNrExt += 65536;
+
+ /*
+ * RTP packets with a sequence number lower
+ * than or equal to the highest received sequence number
+ * are treated as received even though they are not
+ * This advances the send window, similar to what
+ * SACK does in TCP
+ */
+ if (seqNrExt <= highestSeqNrExt && tmp->isAfterReceivedEdge == false) {
+ bytesNewlyAcked += tmp->size;
+ bytesInFlight -= tmp->size;
+ if (bytesInFlight < 0)
+ bytesInFlight = 0;
+ stream->bytesAcked += tmp->size;
+ tmp->isAfterReceivedEdge = true;
+ }
+
+ if (tmp->timeTx_us + kReorderTime_us < stream->timeTxAck_us && !tmp->isAcked) {
+ /*
+ * Packet ACK is delayed more than kReorderTime_us after an ACK of a higher SN packet
+ * raise a loss event and remove from TX list
+ */
+ if (time_us - lastLossEventT_us > sRtt_us && lossBeta < 1.0f) {
+ lossEvent = true;
+ }
+ stream->bytesLost += tmp->size;
+ tmp->isUsed = false;
+ stream->repairLoss = true;
+ }
+ else if (tmp->isAcked) {
+ tmp->isUsed = false;
+ }
+ }
+ }
+
+}
+
+float ScreamTx::getTargetBitrate(uint32_t ssrc) {
+ return getStream(ssrc)->getTargetBitrate();
+}
+
+void ScreamTx::setTargetPriority(uint32_t ssrc, float priority) {
+ Stream *stream = getStream(ssrc);
+ if (queueDelayTrend > 0.02) {
+ stream->targetBitrate *= priority / stream->targetPriority;
+ stream->targetBitrate = std::min(std::max(stream->targetBitrate, stream->minBitrate), stream->maxBitrate);
+ }
+ stream->targetPriority = priority;
+ stream->targetPriorityInv = 1.0f / priority;
+}
+
+void ScreamTx::getLog(float time, char *s) {
+ int inFlightMax = std::max(bytesInFlight, bytesInFlightHistHiMem);
+ sprintf(s, "%4.3f, %4.3f, %4.3f, %4.3f, %6d, %6d, %6.0f, %1d, ",
+ queueDelay, queueDelayMax, queueDelayMinAvg, sRtt,
+ cwnd, bytesInFlight, rateTransmitted / 1000.0f, isInFastStart());
+
+ queueDelayMax = 0.0;
+ for (int n = 0; n < nStreams; n++) {
+ Stream *tmp = streams[n];
+ char s2[200];
+ sprintf(s2, "%4.3f, %6.0f, %6.0f, %6.0f, %6.0f, %5.0f, %5d, ",
+ std::max(0.0f, tmp->rtpQueue->getDelay(time)),
+ tmp->targetBitrate / 1000.0f, tmp->rateRtp / 1000.0f,
+ tmp->rateTransmitted / 1000.0f, tmp->rateAcked / 1000.0f,
+ tmp->rateLost / 1000.0f,
+ tmp->hiSeqAck);
+ strcat(s, s2);
+ }
+}
+
+void ScreamTx::getShortLog(float time, char *s) {
+ int inFlightMax = std::max(bytesInFlight, bytesInFlightHistHiMem);
+ sprintf(s, "%4.3f, %4.3f, %6d, %6d, %6.0f, ",
+ queueDelayMax, sRtt,
+ cwnd, bytesInFlight, rateTransmitted / 1000.0f);
+
+ queueDelayMax = 0.0;
+ for (int n = 0; n < nStreams; n++) {
+ Stream *tmp = streams[n];
+ char s2[200];
+ sprintf(s2, "%4.3f, %6.0f, %6.0f, %6.0f, %5.0f, ",
+ std::max(0.0f, tmp->rtpQueue->getDelay(time)),
+ tmp->targetBitrate / 1000.0f, tmp->rateRtp / 1000.0f,
+ tmp->rateTransmitted / 1000.0f,
+ tmp->rateLost / 1000.0f);
+ strcat(s, s2);
+ }
+}
+
+void ScreamTx::getStatistics(float time, char *s) {
+ statistics->getSummary(time, s);
+}
+
+void ScreamTx::initialize(uint64_t time_us) {
+ isInitialized = true;
+ lastSRttUpdateT_us = time_us;
+ lastBaseOwdAddT_us = time_us;
+ baseOwdResetT_us = time_us;
+ lastAddToQueueDelayFractionHistT_us = time_us;
+ lastLossEventT_us = time_us;
+ lastTransmitT_us = time_us;
+ nextTransmitT_us = time_us;
+ lastRateUpdateT_us = time_us;
+ lastAdjustPrioritiesT_us = time_us;
+ lastRttT_us = time_us;
+ lastBaseDelayRefreshT_us = time_us + 1000000;
+ initTime_us = time_us;
+}
+
+/*
+* Update the congestion window
+*/
+void ScreamTx::updateCwnd(uint64_t time_us) {
+ float dT = 0.001;
+ if (lastCwndUpdateT_us == 0)
+ lastCwndUpdateT_us = time_us;
+ else
+ dT = (time_us - lastCwndUpdateT_us) * 1e-6f;
+
+ /*
+ * This adds a limit to how much the CWND can grow, it is particularly useful
+ * in case of short gliches in the transmission, in which a large chunk of data is delivered
+ * in a burst with the effect that the estimated queue delay is low because it typically depict the queue
+ * delay for the last non-delayed RTP packet. The rule is that the CWND cannot grow faster
+ * than the 1.25 times the average amount of bytes that transmitted in the given feedback interval
+ */
+ float bytesNewlyAckedLimited = bytesNewlyAcked;
+ if (maxRate > 1.0e5f)
+ bytesNewlyAckedLimited = std::min(bytesNewlyAckedLimited, 1.25f*maxRate*dT / 8.0f);
+ else
+ bytesNewlyAckedLimited = 2.0f*mss;
+
+ queueDelayMin = std::min(queueDelayMin, queueDelay);
+
+ queueDelayMax = std::max(queueDelayMax, queueDelay);
+
+ float time = time_us*1e-6;
+ if (queueDelayMinAvg > 0.25f*queueDelayTarget && time_us - baseOwdResetT_us > 20000000) {
+ /*
+ * The base OWD is likely wrong, for instance due to
+ * a channel change or clock drift, reset base OWD history
+ */
+ queueDelayMinAvg = 0.0f;
+ queueDelay = 0.0f;
+ for (int n = 0; n < kBaseOwdHistSize; n++)
+ baseOwdHist[n] = UINT32_MAX;
+ baseOwd = UINT32_MAX;
+ baseOwdHistMin = UINT32_MAX;
+ baseOwdResetT_us = time_us;
+ }
+ /*
+ * An averaged version of the queue delay fraction
+ * neceassary in order to make video rate control robust
+ * against jitter
+ */
+ queueDelayFractionAvg = 0.9f*queueDelayFractionAvg + 0.1f*getQueueDelayFraction();
+
+ /*
+ * Less frequent updates here
+ * + Compute pacing interval
+ * + Save to queue delay fraction history
+ * used in computeQueueDelayTrend()
+ * + Update queueDelayTarget
+ */
+ if ((time_us - lastAddToQueueDelayFractionHistT_us) >
+ kQueueDelayFractionHistInterval_us) {
+
+ /*
+ * compute paceInterval, we assume a min bw of 50kbps and a min tp of 1ms
+ * for stable operation
+ * this function implements the packet pacing
+ */
+ paceInterval = kMinPaceInterval;
+ if (queueDelayFractionAvg > 0.05f && kEnablePacketPacing) {
+ /*
+ * The cautiousPacing parameter restricts transmission of large key frames when the parameter is set to a value closer to 1.0
+ */
+ float pacingBitrate = (1.0 - cautiousPacing)*cwnd * 8.0f / std::max(0.001f, sRtt) + cautiousPacing*rateTransmittedAvg;
+ pacingBitrate = kPacketPacingHeadRoom*std::max(kMinimumBandwidth, pacingBitrate);
+ float tp = (mss * 8.0f) / pacingBitrate;
+ paceInterval = std::max(kMinPaceInterval, tp);
+ }
+ paceInterval_us = (uint64_t)(paceInterval * 1000000);
+
+ if (queueDelayMin < queueDelayMinAvg)
+ queueDelayMinAvg = queueDelayMin;
+ else
+ queueDelayMinAvg = 0.001f*queueDelayMin + 0.999f*queueDelayMinAvg;
+ queueDelayMin = 1000.0f;
+ /*
+ * Need to duplicate insertion incase the feedback is sparse
+ */
+ int nIter = (int)(time_us - lastAddToQueueDelayFractionHistT_us) / kQueueDelayFractionHistInterval_us;
+ for (int n = 0; n < nIter; n++) {
+ queueDelayFractionHist[queueDelayFractionHistPtr] = getQueueDelayFraction();
+ queueDelayFractionHistPtr = (queueDelayFractionHistPtr + 1) % kQueueDelayFractionHistSize;
+ }
+
+ if (time_us - initTime_us > 2000000) {
+ /*
+ * Queue delay trend calculations are reliable after ~2s
+ */
+ computeQueueDelayTrend();
+ }
+
+ queueDelayTrendMem = std::max(queueDelayTrendMem*0.98f, queueDelayTrend);
+
+ /*
+ * Compute bytes in flight limitation
+ */
+ int maxBytesInFlightHi = (int)(std::max(bytesInFlightMaxHi, bytesInFlightHistHiMem));
+ int maxBytesInFlightLo = (int)(std::max(bytesInFlight, bytesInFlightHistLoMem));
+
+ float alpha = std::max(queueDelayTrend, cautiousPacing);
+ maxBytesInFlight =
+ (maxBytesInFlightHi*(1.0f - alpha) + maxBytesInFlightLo*alpha)*
+ kMaxBytesInFlightHeadRoom;
+
+ if (enableSbd) {
+ /*
+ * Shared bottleneck detection,
+ */
+ float queueDelayNorm = queueDelay / queueDelayTargetMin;
+ queueDelayNormHist[queueDelayNormHistPtr] = queueDelayNorm;
+ queueDelayNormHistPtr = (queueDelayNormHistPtr + 1) % kQueueDelayNormHistSize;
+ /*
+ * Compute shared bottleneck detection and update queue delay target
+ * if queue dela variance is sufficienctly low
+ */
+ computeSbd();
+ /*
+ * This function avoids the adjustment of queueDelayTarget when
+ * congestion occurs (indicated by high queueDelaydSbdVar and queueDelaySbdSkew)
+ */
+ float oh = queueDelayTargetMin*(queueDelaySbdMeanSh + sqrt(queueDelaySbdVar));
+ if (lossEventRate > 0.002 && queueDelaySbdMeanSh > 0.5 && queueDelaySbdVar < 0.2) {
+ queueDelayTarget = std::min(kQueueDelayTargetMax, oh*1.5f);
+ }
+ else {
+ if (queueDelaySbdVar < 0.2 && queueDelaySbdSkew < 0.05) {
+ queueDelayTarget = std::max(queueDelayTargetMin, std::min(kQueueDelayTargetMax, oh));
+ }
+ else {
+ if (oh < queueDelayTarget)
+ queueDelayTarget = std::max(queueDelayTargetMin, std::max(queueDelayTarget*0.99f, oh));
+ else
+ queueDelayTarget = std::max(queueDelayTargetMin, queueDelayTarget*0.999f);
+ }
+ }
+ }
+ lastAddToQueueDelayFractionHistT_us = time_us;
+ }
+ /*
+ * offTarget is a normalized deviation from the queue delay target
+ */
+ float offTarget = (queueDelayTarget - queueDelay) / float(queueDelayTarget);
+
+ if (lossEvent) {
+ /*
+ * loss event detected, decrease congestion window
+ */
+ cwnd = std::max(cwndMin, (int)(lossBeta*cwnd));
+ lossEvent = false;
+ lastCongestionDetectedT_us = time_us;
+
+ inFastStart = false;
+ wasLossEvent = true;
+ }
+ else if (ecnCeEvent) {
+ /*
+ * loss event detected, decrease congestion window
+ */
+ cwnd = std::max(cwndMin, (int)(ecnCeBeta*cwnd));
+ ecnCeEvent = false;
+ lastCongestionDetectedT_us = time_us;
+
+ inFastStart = false;
+ wasLossEvent = true;
+ }
+ else {
+
+ if (time_us - lastRttT_us > sRtt_us) {
+ if (wasLossEvent)
+ lossEventRate = 0.99f*lossEventRate + 0.01f;
+ else
+ lossEventRate *= 0.99f;
+ wasLossEvent = false;
+ lastRttT_us = time_us;
+ }
+
+ if (inFastStart) {
+ /*
+ * In fast start
+ */
+ if (queueDelayTrend < 0.2) {
+ /*
+ * CWND is increased by the number of ACKed bytes if
+ * window is used to 1/1.5 = 67%
+ * We need to relax the rule a bit for the case that
+ * feedback may be sparse due to limited RTCP report interval
+ * In addition we put a limit for the cases where feedback becomes
+ * piled up (sometimes happens with e.g LTE)
+ */
+ if (bytesInFlight*1.5 + bytesNewlyAcked > cwnd) {
+ cwnd += bytesNewlyAckedLimited;
+ }
+ }
+ else {
+ inFastStart = false;
+ }
+ }
+ else {
+ if (offTarget > 0.0f) {
+ /*
+ * queue delay below target, increase CWND if window
+ * is used to 1/1.2 = 83%
+ */
+ if (bytesInFlight*1.2 + bytesNewlyAcked > cwnd) {
+ float increment = gainUp * offTarget * bytesNewlyAckedLimited * mss / cwnd;
+ cwnd += (int)(increment + 0.5f);
+ }
+ }
+ else {
+ /*
+ * Queue delay above target.
+ * Limit the CWND reduction to at most a quarter window
+ * this avoids unduly large reductions for the cases
+ * where data is queued up e.g because of retransmissions
+ * on lower protocol layers.
+ */
+ float delta = -(gainDown * offTarget * bytesNewlyAcked * mss / cwnd);
+ delta = std::min((int)delta, cwnd / 4);
+ cwnd -= (int)(delta);
+
+ /*
+ * Especially when running over low bitrate bottlenecks, it is
+ * beneficial to reduce the target bitrate a little, it limits
+ * possible RTP queue delay spikes when congestion window is reduced
+ */
+ float rateTotal = 0.0f;
+ for (int n = 0; n < nStreams; n++)
+ rateTotal += streams[n]->getMaxRate();
+ if (rateTotal < 1.0e5f) {
+ delta = delta / cwnd;
+ float rateAdjustFactor = (1.0f - delta);
+ for (int n = 0; n < nStreams; n++) {
+ Stream *tmp = streams[n];
+ tmp->targetBitrate = std::max(tmp->minBitrate,
+ std::min(tmp->maxBitrate,
+ tmp->targetBitrate*rateAdjustFactor));
+ }
+ }
+ lastCongestionDetectedT_us = time_us;
+
+ }
+ }
+ }
+ /*
+ * Congestion window validation, checks that the congestion window is
+ * not considerably higher than the actual number of bytes in flight
+ */
+ if (maxBytesInFlight > 5000) {
+ cwnd = std::min(cwnd, (int)maxBytesInFlight);
+ }
+
+ if (sRtt < 0.01f && queueDelayTrend < 0.1) {
+ int tmp = int(rateTransmitted*0.01f / 8);
+ tmp = std::max(tmp, (int)(maxBytesInFlight*1.5f));
+ cwnd = std::max(cwnd, tmp);
+ }
+ cwnd = std::max(cwndMin, cwnd);
+
+ /*
+ * Make possible to enter fast start if OWD has been low for a while
+ */
+ if (queueDelayTrend > 0.2) {
+ lastCongestionDetectedT_us = time_us;
+ }
+ else if (time_us - lastCongestionDetectedT_us > 5000000 &&
+ !inFastStart && kEnableConsecutiveFastStart) {
+ /*
+ * The queue delay trend has been low for more than 5.0s, resume fast start
+ */
+ inFastStart = true;
+ lastCongestionDetectedT_us = time_us;
+ }
+ bytesNewlyAcked = 0;
+}
+
+/*
+* Update base OWD (if needed) and return the
+* last estimated OWD (without offset compensation)
+*/
+uint32_t ScreamTx::estimateOwd(uint64_t time_us) {
+ baseOwd = std::min(baseOwd, ackedOwd);
+ if (time_us - lastBaseOwdAddT_us >= kBaseDelayUpdateInterval_us) {
+ baseOwdHist[baseOwdHistPtr] = baseOwd;
+ baseOwdHistPtr = (baseOwdHistPtr + 1) % kBaseOwdHistSize;
+ lastBaseOwdAddT_us = time_us;
+ baseOwd = UINT32_MAX;
+ baseOwdHistMin = UINT32_MAX;
+ for (int n = 0; n < kBaseOwdHistSize; n++)
+ baseOwdHistMin = std::min(baseOwdHistMin, baseOwdHist[n]);
+ /*
+ * _Very_ long periods of congestion can cause the base delay to increase
+ * with the effect that the queue delay is estimated wrong, therefore we seek to
+ * refresh the whole thing by deliberately allowing the network queue to drain
+ */
+ if (time_us - lastBaseDelayRefreshT_us > kBaseDelayUpdateInterval_us*(kBaseOwdHistSize - 1)) {
+ lastBaseDelayRefreshT_us = time_us;
+ }
+ }
+ return ackedOwd;
+}
+
+/*
+* Get the base one way delay
+*/
+uint32_t ScreamTx::getBaseOwd() {
+ return std::min(baseOwd, baseOwdHistMin);
+}
+
+/*
+* Get the queue delay fraction
+*/
+float ScreamTx::getQueueDelayFraction() {
+ return queueDelay / queueDelayTarget;
+}
+
+/*
+* Compute congestion indicator
+*/
+void ScreamTx::computeQueueDelayTrend() {
+ queueDelayTrend = 0.0;
+ int ptr = queueDelayFractionHistPtr;
+ float avg = 0.0f, x1, x2, a0, a1;
+
+ for (int n = 0; n < kQueueDelayFractionHistSize; n++) {
+ avg += queueDelayFractionHist[ptr];
+ ptr = (ptr + 1) % kQueueDelayFractionHistSize;
+ }
+ avg /= kQueueDelayFractionHistSize;
+
+ ptr = queueDelayFractionHistPtr;
+ x2 = 0.0f;
+ a0 = 0.0f;
+ a1 = 0.0f;
+ for (int n = 0; n < kQueueDelayFractionHistSize; n++) {
+ x1 = queueDelayFractionHist[ptr] - avg;
+ a0 += x1 * x1;
+ a1 += x1 * x2;
+ x2 = x1;
+ ptr = (ptr + 1) % kQueueDelayFractionHistSize;
+ }
+ if (a0 > 0) {
+ queueDelayTrend = std::max(0.0f, std::min(1.0f, (a1 / a0)*queueDelayFractionAvg));
+ }
+}
+
+/*
+* Compute indicators of shared bottleneck
+*/
+void ScreamTx::computeSbd() {
+ float queueDelayNorm, tmp;
+ queueDelaySbdMean = 0.0;
+ queueDelaySbdMeanSh = 0.0;
+ queueDelaySbdVar = 0.0;
+ int ptr = queueDelayNormHistPtr;
+ for (int n = 0; n < kQueueDelayNormHistSize; n++) {
+ queueDelayNorm = queueDelayNormHist[ptr];
+ queueDelaySbdMean += queueDelayNorm;
+ if (n >= kQueueDelayNormHistSize - kQueueDelayNormHistSizeSh) {
+ queueDelaySbdMeanSh += queueDelayNorm;
+ }
+ ptr = (ptr + 1) % kQueueDelayNormHistSize;
+ }
+ queueDelaySbdMean /= kQueueDelayNormHistSize;
+ queueDelaySbdMeanSh /= kQueueDelayNormHistSizeSh;
+
+ ptr = queueDelayNormHistPtr;
+ for (int n = 0; n < kQueueDelayNormHistSize; n++) {
+ queueDelayNorm = queueDelayNormHist[ptr];
+ tmp = queueDelayNorm - queueDelaySbdMean;
+ queueDelaySbdVar += tmp * tmp;
+ queueDelaySbdSkew += tmp * tmp * tmp;
+ ptr = (ptr + 1) % kQueueDelayNormHistSize;
+ }
+ queueDelaySbdVar /= kQueueDelayNormHistSize;
+ queueDelaySbdSkew /= kQueueDelayNormHistSize;
+}
+
+/*
+* true if the queueDelayTarget is increased due to
+* detected competing flows
+*/
+bool ScreamTx::isCompetingFlows() {
+ return queueDelayTarget > queueDelayTargetMin;
+}
+
+/*
+* Get queue delay trend
+*/
+float ScreamTx::getQueueDelayTrend() {
+ return queueDelayTrend;
+}
+
+/*
+* Determine active streams
+*/
+void ScreamTx::determineActiveStreams(uint64_t time_us) {
+ float surplusBitrate = 0.0f;
+ float sumPrio = 0.0;
+ bool streamSetInactive = false;
+ for (int n = 0; n < nStreams; n++) {
+ if (time_us - streams[n]->lastFrameT_us > 1000000 && streams[n]->isActive) {
+ streams[n]->isActive = false;
+ surplusBitrate += streams[n]->targetBitrate;
+ streams[n]->targetBitrate = streams[n]->minBitrate;
+ streamSetInactive = true;
+ }
+ else {
+ sumPrio += streams[n]->targetPriority;
+ }
+ }
+ if (streamSetInactive) {
+ for (int n = 0; n < nStreams; n++) {
+ if (streams[n]->isActive) {
+ streams[n]->targetBitrate = std::min(streams[n]->maxBitrate,
+ streams[n]->targetBitrate +
+ surplusBitrate*streams[n]->targetPriority / sumPrio);
+ }
+ }
+ }
+}
+
+/*
+* Add credit to streams that was not served
+*/
+void ScreamTx::addCredit(uint64_t time_us, Stream* servedStream, int transmittedBytes) {
+ /*
+ * Add a credit to stream(s) that did not get priority to transmit RTP packets
+ */
+ if (nStreams == 1)
+ /*
+ * Skip if only one stream to save CPU
+ */
+ return;
+ int maxCredit = 10 * mss;
+ for (int n = 0; n < nStreams; n++) {
+ Stream *tmp = streams[n];
+ if (tmp != servedStream) {
+ int credit = (int)(transmittedBytes*tmp->targetPriority * servedStream->targetPriorityInv);
+ if (tmp->rtpQueue->sizeOfQueue() > 0) {
+ tmp->credit += credit;
+ }
+ else {
+ tmp->credit += credit;
+ if (tmp->credit > maxCredit) {
+ tmp->creditLost += tmp->credit - maxCredit;
+ tmp->credit = maxCredit;
+ }
+ //tmp->credit = std::min(10 * mss, tmp->credit + credit);
+ }
+ }
+ }
+}
+
+/*
+* Subtract credit from served stream
+*/
+void ScreamTx::subtractCredit(uint64_t time_us, Stream* servedStream, int transmittedBytes) {
+ /*
+ * Subtract a credit equal to the number of transmitted bytes from the stream that
+ * transmitted a packet
+ */
+ if (nStreams == 1)
+ /*
+ * Skip if only one stream to save CPU
+ */
+ return;
+ servedStream->credit = std::max(0, servedStream->credit - transmittedBytes);
+}
+ScreamTx::Stream::Stream(ScreamTx *parent_,
+ RtpQueueIface *rtpQueue_,
+ uint32_t ssrc_,
+ float priority_,
+ float minBitrate_,
+ float startBitrate_,
+ float maxBitrate_,
+ float rampUpSpeed_,
+ float maxRtpQueueDelay_,
+ float txQueueSizeFactor_,
+ float queueDelayGuard_,
+ float lossEventRateScale_,
+ float ecnCeEventRateScale_) {
+ parent = parent_;
+ rtpQueue = rtpQueue_;
+ ssrc = ssrc_;
+ targetPriority = priority_;
+ targetPriorityInv = 1.0f / targetPriority;
+ minBitrate = minBitrate_;
+ maxBitrate = maxBitrate_;
+ targetBitrate = std::min(maxBitrate, std::max(minBitrate, startBitrate_));
+ rampUpSpeed = rampUpSpeed_;
+ maxRtpQueueDelay = maxRtpQueueDelay_;
+ txQueueSizeFactor = txQueueSizeFactor_;
+ queueDelayGuard = queueDelayGuard_;
+ lossEventRateScale = lossEventRateScale_;
+ ecnCeEventRateScale = ecnCeEventRateScale_;
+ targetBitrateHistUpdateT_us = 0;
+ targetBitrateI = 1.0f;
+ credit = 0;
+ creditLost = 0;
+ bytesTransmitted = 0;
+ bytesAcked = 0;
+ bytesLost = 0;
+ hiSeqAck = 0;
+ hiSeqTx = 0;
+ rateTransmitted = 0.0f;
+ rateAcked = 0.0f;
+ rateLost = 0.0f;
+ lossEventFlag = false;
+ ecnCeEventFlag = false;
+ txSizeBitsAvg = 0.0f;
+ lastRateUpdateT_us = 0;
+ lastBitrateAdjustT_us = 0;
+ lastTargetBitrateIUpdateT_us = 0;
+ bytesRtp = 0;
+ rateRtp = 0.0f;
+ lastLossDetectIx = -1;
+ ecnCeMarkedBytes = 0;
+ timeTxAck_us = 0;
+
+ for (int n = 0; n < kRateUpDateSize; n++) {
+ rateRtpHist[n] = 0.0f;
+ rateAckedHist[n] = 0.0f;
+ rateLostHist[n] = 0.0f;
+ rateTransmittedHist[n] = 0.0f;
+ }
+ rateUpdateHistPtr = 0;
+ for (int n = 0; n < kTargetBitrateHistSize; n++) {
+ targetBitrateHist[n] = 0;
+ }
+ targetBitrateHistPtr = 0;
+ targetRateScale = 1.0;
+ isActive = false;
+ lastFrameT_us = 0;
+ initTime_us = 0;
+ rtpQueueDiscard = false;
+ lastRtpQueueDiscardT_us = 0;
+ rateLost = 0.0;
+ bytesLost = 0;
+ wasRepairLoss = false;
+ repairLoss = false;
+ for (int n = 0; n < kMaxTxPackets; n++)
+ txPackets[n].isUsed = false;
+ txPacketsPtr = 0;
+}
+
+/*
+* Update the estimated max media rate
+*/
+void ScreamTx::Stream::updateRate(uint64_t time_us) {
+ if (lastRateUpdateT_us != 0) {
+ float tDelta = (time_us - lastRateUpdateT_us) * 1e-6f;
+
+ rateTransmittedHist[rateUpdateHistPtr] = bytesTransmitted*8.0f / tDelta;
+ rateAckedHist[rateUpdateHistPtr] = bytesAcked*8.0f / tDelta;
+ rateLostHist[rateUpdateHistPtr] = bytesLost*8.0f / tDelta;
+ rateRtpHist[rateUpdateHistPtr] = bytesRtp * 8.0f / tDelta;
+ rateUpdateHistPtr = (rateUpdateHistPtr + 1) % kRateUpDateSize;
+ rateTransmitted = 0.0f;
+ rateAcked = 0.0f;
+ rateLost = 0.0f;
+ rateRtp = 0.0f;
+ for (int n = 0; n < kRateUpDateSize; n++) {
+ rateTransmitted += rateTransmittedHist[n];
+ rateAcked += rateAckedHist[n];
+ rateLost += rateLostHist[n];
+ rateRtp += rateRtpHist[n];
+ }
+ rateTransmitted /= kRateUpDateSize;
+ rateAcked /= kRateUpDateSize;
+ rateLost /= kRateUpDateSize;
+ rateRtp /= kRateUpDateSize;
+ if (rateRtp > 0) {
+ /*
+ * Video coders are strange animals.. In certain cases the average bitrate is
+ * consistently lower or higher than the target bitare. This additonal scaling compensates
+ * for this anomaly.
+ */
+ const float alpha = 0.05f;
+ targetRateScale *= (1.0f - alpha);
+ targetRateScale += alpha*targetBitrate / rateRtp;
+ targetRateScale = std::min(1.25f, std::max(0.8f, targetRateScale));
+ }
+ }
+
+ bytesTransmitted = 0;
+ bytesAcked = 0;
+ bytesRtp = 0;
+ bytesLost = 0;
+ lastRateUpdateT_us = time_us;
+}
+
+/*
+* Get the estimated maximum media rate
+*/
+float ScreamTx::Stream::getMaxRate() {
+ return std::max(rateTransmitted, rateAcked);
+}
+
+/*
+* The the stream that matches SSRC
+*/
+ScreamTx::Stream* ScreamTx::getStream(uint32_t ssrc) {
+ for (int n = 0; n < nStreams; n++) {
+ if (streams[n]->isMatch(ssrc)) {
+ return streams[n];
+ }
+ }
+ return NULL;
+}
+
+/*
+* Get the target bitrate.
+* This function returns a value -1 if loss of RTP packets is detected,
+* either because of loss in network or RTP queue discard
+*/
+float ScreamTx::Stream::getTargetBitrate() {
+
+ bool requestRefresh = isRtpQueueDiscard() || repairLoss;
+ repairLoss = false;
+ if (requestRefresh && !wasRepairLoss) {
+ wasRepairLoss = true;
+ return -1.0;
+ }
+ float rate = targetRateScale*targetBitrate;
+ /*
+ * Video coders are strange animals.. In certain cases a very frequent rate requests can confuse the
+ * rate control logic in the coder
+ */
+ wasRepairLoss = false;
+ return rate;
+}
+
+/*
+* A small history of past max bitrates is maintained and the max value is picked.
+* This solves a problem where consequtive rate decreases can give too low
+* targetBitrateI values.
+*/
+void ScreamTx::Stream::updateTargetBitrateI(float br) {
+ targetBitrateHist[targetBitrateHistPtr] = std::min(br, targetBitrate);
+ targetBitrateHistPtr = (targetBitrateHistPtr + 1) % kTargetBitrateHistSize;
+ targetBitrateI = std::min(br, targetBitrate);
+ for (int n = 0; n < kTargetBitrateHistSize; n++) {
+ targetBitrateI = std::max(targetBitrateI, targetBitrateHist[n]);
+ }
+
+}
+
+/*
+* Update the target bitrate, the target bitrate includes the RTP overhead
+*/
+void ScreamTx::Stream::updateTargetBitrate(uint64_t time_us) {
+ /*
+ * Compute a maximum bitrate, this bitrates includes the RTP overhead
+ */
+ float br = getMaxRate();
+ float rateRtpLimit = br;
+ if (initTime_us == 0) {
+ /*
+ * Initialize if the first time
+ */
+ initTime_us = time_us;
+ lastRtpQueueDiscardT_us = time_us;
+ }
+
+ if (lastBitrateAdjustT_us == 0) lastBitrateAdjustT_us = time_us;
+ isActive = true;
+ lastFrameT_us = time_us;
+
+ if (lossEventFlag || ecnCeEventFlag) {
+ /*
+ * Loss event handling
+ * Rate is reduced slightly to avoid that more frames than necessary
+ * queue up in the sender queue
+ */
+ if (time_us - lastTargetBitrateIUpdateT_us > 2000000) {
+ /*
+ * The timing constraint avoids that targetBitrateI
+ * is set too low in cases where a congestion event is prolonged.
+ * An accurate targetBitrateI is not of extreme importance
+ * but helps to avoid jitter spikes when SCReAM operates
+ * over fixed bandwidth or slowly varying links.
+ */
+ updateTargetBitrateI(br);
+ lastTargetBitrateIUpdateT_us = time_us;
+ }
+ if (lossEventFlag)
+ targetBitrate = std::max(minBitrate, targetBitrate*lossEventRateScale);
+ else if (ecnCeEventFlag)
+ targetBitrate = std::max(minBitrate, targetBitrate*ecnCeEventRateScale);
+
+ lossEventFlag = false;
+ ecnCeEventFlag = false;
+ lastBitrateAdjustT_us = time_us;
+ }
+ else {
+ if (time_us - lastBitrateAdjustT_us < kRateAdjustInterval_us)
+ return;
+ /*
+ * A scale factor that is dependent on the inflection point
+ * i.e the last known highest video bitrate
+ */
+ float sclI = (targetBitrate - targetBitrateI) / targetBitrateI;
+ sclI *= 4;
+ sclI = std::max(0.2f, std::min(1.0f, sclI*sclI));
+ float increment = 0.0f;
+
+ /*
+ * Size of RTP queue [bits]
+ * As this function is called immediately after a
+ * video frame is produced, we need to accept the new
+ * RTP packets in the queue, we subtract a number of bytes correspoding to the size
+ * of the last frame (including RTP overhead), this is simply the aggregated size
+ * of the RTP packets with the highest RTP timestamp
+ */
+ int lastBytes = rtpQueue->getSizeOfLastFrame();
+ int txSizeBits = std::max(0, rtpQueue->bytesInQueue() - lastBytes) * 8;
+
+ float alpha = 0.5f;
+
+ txSizeBitsAvg = txSizeBitsAvg*alpha + txSizeBits*(1.0f - alpha);
+ /*
+ * tmp is a local scaling factor that makes rate adaptation sligthly more
+ * aggressive when competing flows (e.g file transfers) are detected
+ */
+ float rampUpSpeedTmp = std::min(rampUpSpeed, targetBitrate*0.5f);
+ if (parent->isCompetingFlows()) {
+ rampUpSpeedTmp *= 2.0f;
+ }
+
+ float rtpQueueDelay = rtpQueue->getDelay(time_us * 1e-6f);
+ if (rtpQueueDelay > maxRtpQueueDelay &&
+ (time_us - lastRtpQueueDiscardT_us > kMinRtpQueueDiscardInterval_us)) {
+ /*
+ * RTP queue is cleared as it is becoming too large,
+ * Function is however disabled initially as there is no reliable estimate of the
+ * throughput in the initial phase.
+ */
+ rtpQueue->clear();
+
+ rtpQueueDiscard = true;
+ //parent->bytesInFlight = 0;
+
+ lastRtpQueueDiscardT_us = time_us;
+ targetRateScale = 1.0;
+ txSizeBitsAvg = 0.0f;
+ }
+ else if (parent->inFastStart && rtpQueueDelay < 0.1f) {
+ /*
+ * Increment bitrate, limited by the rampUpSpeed
+ */
+ increment = rampUpSpeedTmp*(kRateAdjustInterval_us * 1e-6f);
+ /*
+ * Limit increase rate near the last known highest bitrate or if priority is low
+ */
+ increment *= sclI*sqrt(targetPriority);
+ /*
+ * No increase if the actual coder rate is lower than the target
+ */
+ if (targetBitrate > rateRtpLimit*1.5f)
+ increment = 0;
+ /*
+ * Add increment
+ */
+ targetBitrate += increment;
+ wasFastStart = true;
+ }
+ else {
+ if (wasFastStart) {
+ wasFastStart = false;
+ if (time_us - lastTargetBitrateIUpdateT_us > 2000000) {
+ /*
+ * The timing constraint avoids that targetBitrateI
+ * is set too low in cases where a
+ * congestion event is prolonged
+ */
+ updateTargetBitrateI(br);
+ lastTargetBitrateIUpdateT_us = time_us;
+ }
+ }
+ /*
+ * scl is based on the queue delay trend
+ */
+ float scl = queueDelayGuard*parent->getQueueDelayTrend();
+ if (parent->isCompetingFlows())
+ scl *= 0.05f;
+
+ /*
+ * Update target rate
+ * At very low bitrates it is necessary to actively try to push the
+ * the bitrate up some extra
+ */
+ float incrementScale = 1.0f + 0.05f*std::min(1.0f, 50000.0f / targetBitrate);
+
+ float increment = incrementScale*br*(1.0f - scl) -
+ txQueueSizeFactor*txSizeBitsAvg - targetBitrate;
+ if (txSizeBits > 12000 && increment > 0)
+ increment = 0;
+
+ if (increment > 0) {
+ wasFastStart = true;
+ if (!parent->isCompetingFlows()) {
+ /*
+ * Limit the bitrate increase so that it does not go faster than rampUpSpeedTmp
+ * This limitation is not in effect if competing flows are detected
+ */
+ increment *= sclI;
+ increment = std::min(increment, (float)(rampUpSpeedTmp*(kRateAdjustInterval_us * 1e-6)));
+ }
+ if (targetBitrate > rateRtpLimit*1.5f)
+ increment = 0;
+ }
+ else {
+ /*
+ * Avoid that the target bitrate is reduced if it actually is the media
+ * coder that limits the output rate e.g due to inactivity
+ */
+ if (rateRtp < targetBitrate*0.8f)
+ increment = 0.0f;
+ /*
+ * Also avoid that the target bitrate is reduced if
+ * the coder bitrate is higher
+ * than the target.
+ * The possible reason is that a large I frame is transmitted, another reason is
+ * complex dynamic content.
+ */
+ if (rateRtp > targetBitrate*2.0f)
+ increment = 0.0f;
+ }
+ targetBitrate += increment;
+ }
+ lastBitrateAdjustT_us = time_us;
+ }
+
+ targetBitrate = std::min(maxBitrate, std::max(minBitrate, targetBitrate));
+}
+
+bool ScreamTx::Stream::isRtpQueueDiscard() {
+ bool tmp = rtpQueueDiscard;
+ rtpQueueDiscard = false;
+ return tmp;
+}
+
+/*
+* Adjust (enforce) proper prioritization between active streams
+* at regular intervals. This is a necessary addon to mitigate
+* issues that VBR media brings
+* The function consists of equal measures or rational thinking and
+* black magic, which means that there is no 100% guarantee that
+* will always work.
+*/
+void ScreamTx::adjustPriorities(uint64_t time_us) {
+ if (nStreams == 1 || time_us - lastAdjustPrioritiesT_us < 1000000) {
+ /*
+ * Skip if only one stream or if adjustment done less than 5s ago
+ */
+ return;
+ }
+
+ if (queueDelayTrend > 0.02) {
+ /*
+ * Adjust only if there is some evidence of congestion
+ */
+ int avgCreditLost = 0;
+ int avgCreditLostN = 0;
+ for (int n = 0; n < nStreams; n++) {
+ avgCreditLost += streams[n]->creditLost;
+ if (streams[n]->isActive)
+ avgCreditLostN++;
+ }
+ if (avgCreditLostN <= 1) {
+ /*
+ * At the most 1 steam active, skip adjustment
+ */
+ return;
+ }
+
+ avgCreditLost /= avgCreditLostN;
+ for (int n = 0; n < nStreams; n++) {
+ if (true && streams[n]->isActive) {
+ if (streams[n]->creditLost < avgCreditLost &&
+ streams[n]->targetBitrate > streams[n]->rateRtp) {
+ /*
+ * Stream is using more of its share than the average
+ * bitrate is likelky too high, reduce target bitrate
+ * This algorithm works best when we want to ensure
+ * different priorities
+ */
+ streams[n]->targetBitrate = std::max(streams[n]->minBitrate, streams[n]->targetBitrate*0.9f);
+ }
+ }
+ }
+
+ for (int n = 0; n < nStreams; n++)
+ streams[n]->creditLost = 0;
+
+
+ lastAdjustPrioritiesT_us = time_us;
+
+ }
+ if (time_us - lastAdjustPrioritiesT_us < 20000000) {
+ /*
+ * Clear old statistics of unused credits
+ */
+ for (int n = 0; n < nStreams; n++)
+ streams[n]->creditLost = 0;
+
+
+ lastAdjustPrioritiesT_us = time_us;
+ }
+}
+
+/*
+* Get the prioritized stream
+*/
+ScreamTx::Stream* ScreamTx::getPrioritizedStream(uint64_t time_us) {
+ /*
+ * Function that prioritizes between streams, this function may need
+ * to be modified to handle the prioritization better for e.g
+ * FEC, SVC etc.
+ */
+ if (nStreams == 1)
+ /*
+ * Skip if only one stream to save CPU
+ */
+ return streams[0];
+
+ int maxCredit = 1;
+ Stream *stream = NULL;
+ /*
+ * Pick a stream with credit higher or equal to
+ * the size of the next RTP packet in queue for the given stream.
+ */
+ for (int n = 0; n < nStreams; n++) {
+ Stream *tmp = streams[n];
+ if (tmp->rtpQueue->sizeOfQueue() == 0) {
+ /*
+ * Queue empty
+ */
+ }
+ else {
+ /*
+ * Pick stream if it has the highest credit so far
+ */
+ if (tmp->credit >= std::max(maxCredit, tmp->rtpQueue->sizeOfNextRtp())) {
+ stream = tmp;
+ maxCredit = tmp->credit;
+ }
+ }
+ }
+ if (stream != NULL) {
+ return stream;
+ }
+ /*
+ * If the above doesn't give a candidate..
+ * Pick the stream with the highest priority that also
+ * has at least one RTP packet in queue.
+ */
+ float maxPrio = 0.0;
+ for (int n = 0; n < nStreams; n++) {
+ Stream *tmp = streams[n];
+ float priority = tmp->targetPriority;
+ if (tmp->rtpQueue->sizeOfQueue() > 0 && priority > maxPrio) {
+ maxPrio = priority;
+ stream = tmp;
+ }
+ }
+ return stream;
+}
diff --git a/Laptop/scream/scream_receiver/code/ScreamTx.h b/Laptop/scream/scream_receiver/code/ScreamTx.h
new file mode 100644
index 0000000000000000000000000000000000000000..786f465300539fdbdacf91729e67380fc179f612
--- /dev/null
+++ b/Laptop/scream/scream_receiver/code/ScreamTx.h
@@ -0,0 +1,618 @@
+#ifndef SCREAM_TX
+#define SCREAM_TX
+
+#include <string.h>
+#include <iostream>
+#include <cstdint>
+using namespace std;
+
+/*
+* This module implements the sender side of SCReAM,
+* see https://github.com/EricssonResearch/scream/blob/master/SCReAM-description.pdf
+* for details on how it is integrated in audio/video platforms
+* A full implementation needs the additional code for
+* + RTCP feedback (e.g using RFC3611 XR elements)
+* + RTP queue(s), one queue per stream, see SCReAM description for interface description
+* + Other obvious stuff such as RTP payload packetizer, video+audio capture, coders....
+*
+*/
+
+// ==== Default parameters (if tuning necessary) ====
+// Connection related default parameters
+// CWND scale factor upon loss event
+static const float kLossBeta = 0.8f;
+// CWND scale factor upon ECN-CE event
+static const float kEcnCeBeta = 0.9f;
+// Min and max queue delay target
+static const float kQueueDelayTargetMin = 0.1f; //ms
+// Enable shared botleneck detection and queue delay target adjustement
+// good if SCReAM needs to compete with e.g FTP but
+// Can in some cases cause self-inflicted congestion
+// i.e the e2e delay can become large even though
+// there is no competing traffic present
+// For some reason, self-inflicted congestion is easily triggered
+// when an audio + video stream is run, so bottomline is that
+// this feature is a bit shaky
+static const bool kEnableSbd = false;
+// CWND up and down gain factors
+static const float kGainUp = 1.0f;
+static const float kGainDown = 2.0f;
+
+// Stream related default parameters
+// Max video rampup speed in bps/s (bits per second increase per second)
+static const float kRampUpSpeed = 200000.0f; // bps/s
+// Max RTP queue delay, RTP queue is cleared if this value is exceeded
+static const float kMaxRtpQueueDelay = 0.1; // 0.1s
+// Compensation factor for RTP queue size
+// A higher value such as 0.2 gives less jitter esp. in wireless (LTE)
+// but potentially also lower link utilization
+static const float kTxQueueSizeFactor = 0.2f;
+// Compensation factor for detected congestion in rate computation
+// A higher value such as 0.5 gives less jitter esp. in wireless (LTE)
+// but potentially also lower link utilization
+static const float kQueueDelayGuard = 0.1f;
+// Video rate scaling due to loss events
+static const float kLossEventRateScale = 0.9f;
+// Video rate scaling due to ECN marking events
+static const float kEcnCeEventRateScale = 0.95f;
+
+
+
+// Constants
+/*
+* Timestamp sampling rate for SCReAM feedback
+*/
+static const float kTimestampRate = 1000.0f;
+/*
+* Max number of RTP packets in flight
+* With and MSS = 1200 byte and an RTT = 200ms
+* this is enount to support media bitrates of ~50Mbps
+* Note, 65536 % kMaxTxPackets must be zero
+*/
+static const int kMaxTxPackets = 2048;
+/*
+* Max number of streams
+*/
+static const int kMaxStreams = 10;
+/*
+* History vectors
+*/
+static const int kBaseOwdHistSize = 50;
+static const int kQueueDelayNormHistSize = 200;
+static const int kQueueDelayNormHistSizeSh = 50;
+static const int kQueueDelayFractionHistSize = 20;
+static const int kBytesInFlightHistSizeMax = 60;
+static const int kRateUpDateSize = 4;
+static const int kTargetBitrateHistSize = 3;
+static const int kLossRateHistSize = 10;
+
+class RtpQueueIface;
+class ScreamTx {
+public:
+ /*
+ * Constructor, see constant definitions above for an explanation of parameters
+ * cwnd > 0 sets a different initial congestion window, for example it can be set to
+ * initialrate/8*rtt
+ * cautiousPacing is set in the range [0.0..1.0]. A higher values restricts the transmission rate of large key frames
+ * which can be beneficial if it is evident that large key frames cause packet drops, for instance due to
+ * reduced buffer size in wireless modems.
+ * This is however at the potential cost of an overall increased transmission delay also when links are uncongested
+ * as the RTP packets are more likely to be buffered up on the sender side when cautiousPacing is set close to 1.0.
+ * lossBeta == 1.0 means that packet losses are ignored by the congestion control
+ */
+ ScreamTx(float lossBeta = kLossBeta,
+ float ecnCeBeta = kEcnCeBeta,
+ float queueDelayTargetMin = kQueueDelayTargetMin,
+ bool enableSbd = kEnableSbd,
+ float gainUp = kGainUp,
+ float gainDown = kGainDown,
+ int cwnd = 0, // An initial cwnd larger than 2*mss
+ float cautiousPacing = 0.0f,
+ int bytesInFlightHistSize = 5,
+ bool openWindow = false);
+
+ ~ScreamTx();
+
+ /*
+ * Register a new stream {SSRC,PT} tuple,
+ * with a priority value in the range ]0.0..1.0]
+ * where 1.0 denotes the highest priority.
+ * It is recommended that at least one stream has prioritity 1.0.
+ * Bitrates are specified in bps
+ * See constant definitions above for an explanation of other default parameters
+ */
+ void registerNewStream(RtpQueueIface *rtpQueue,
+ uint32_t ssrc,
+ float priority, // priority in range ]0.0 .. 1.0], 1.0 is highest
+ float minBitrate, // Min target bitrate
+ float startBitrate, // Starting bitrate
+ float maxBitrate, // Max target bitrate
+ float rampUpSpeed = kRampUpSpeed,
+ float maxRtpQueueDelay = kMaxRtpQueueDelay,
+ float txQueueSizeFactor = kTxQueueSizeFactor,
+ float queueDelayGuard = kQueueDelayGuard,
+ float lossEventRateScale = kLossEventRateScale,
+ float ecnCeEventRateScale = kEcnCeEventRateScale);
+
+ /*
+ * Updates the min and max bitrates for an existing stream
+ */
+ void updateBitrateStream(uint32_t ssrc,
+ float minBitrate,
+ float maxBitrate);
+
+ /*
+ * Access the configured RtpQueue of an existing stream
+ */
+ RtpQueueIface * getStreamQueue(uint32_t ssrc);
+
+ /*
+ * Call this function for each new video frame
+ * Note : isOkToTransmit should be called after newMediaFrame
+ */
+ void newMediaFrame(uint64_t time_us, uint32_t ssrc, int bytesRtp);
+
+ /*
+ * Function determines if an RTP packet with SSRC can be transmitted
+ * Return values :
+ * 0.0 : RTP packet with SSRC can be immediately transmitted
+ * addTransmitted must be called if packet is transmitted as a result of this
+ * >0.0 : Time [s] until this function should be called again
+ * This can be used to start a timer
+ * Note that a call to newMediaFrame or incomingFeedback should
+ * cause an immediate call to isOkToTransmit
+ * -1.0 : No RTP packet available to transmit or send window is not large enough
+ */
+ float isOkToTransmit(uint64_t time_us, uint32_t &ssrc);
+
+ /*
+ * Add packet to list of transmitted packets
+ * should be called when an RTP packet transmitted
+ * Return time until isOkToTransmit can be called again
+ */
+ float addTransmitted(uint64_t timestamp_us, // Wall clock ts when packet is transmitted
+ uint32_t ssrc,
+ int size,
+ uint16_t seqNr);
+
+ /*
+ * New incoming feedback, this function
+ * triggers a CWND update
+ * The SCReAM timestamp is in jiffies, where the frequency is controlled
+ * by the timestamp clock frequency (default 1000Hz)
+ * The ackVector indicates recption of the 64 RTP SN prior to highestSeqNr
+ * Note : isOkToTransmit should be called after incomingFeedback
+ * ecnCeMarkedBytes indicates the cumulative number of bytes that are ECN-CE marked
+ */
+ void incomingFeedback(uint64_t time_us,
+ uint32_t ssrc, // SSRC of stream
+ uint32_t timestamp, // SCReAM FB timestamp [jiffy]
+ uint16_t highestSeqNr, // Highest ACKed RTP sequence number
+ uint64_t ackVector, // ACK vector
+ uint16_t ecnCeMarkedBytes = 0); // Number of ECN marked bytes
+
+ /*
+ * Parse feedback according to the format below. It is up to the
+ * wrapper application this RTCP from a compound RTCP if needed
+ * BT = 255, means that this is experimental use
+ *
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |V=2|P|reserved | PT=XR=207 | length=6 |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | SSRC |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | BT=255 | reserved | block length=4 |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | SSRC of source |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Highest recv. seq. nr. (16b) | ECN_CE_bytes |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Ack vector (b0-31) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Ack vector (b32-63) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Timestamp (32bits) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+ void incomingFeedback(uint64_t time_us,
+ unsigned char* buf,
+ int size);
+
+ /*
+ * Get the target bitrate for stream with SSRC
+ * NOTE!, Because SCReAM operates on RTP packets, the target bitrate will
+ * also include the RTP overhead. This means that a subsequent call to set the
+ * media coder target bitrate must subtract an estimate of the RTP + framing
+ * overhead. This is not critical for Video bitrates but can be important
+ * when SCReAM is used to congestion control e.g low bitrate audio streams
+ * Function returns -1 if a loss is detected, this signal can be used to
+ * request a new key frame from a video encoder
+ */
+ float getTargetBitrate(uint32_t ssrc);
+
+ /*
+ * Set target priority for a given stream, priority value should be in range ]0.0..1.0]
+ */
+ void setTargetPriority(uint32_t ssrc, float aPriority);
+
+ /*
+ * Get verbose log information
+ */
+ void getLog(float time, char *s);
+
+ /*
+ * Get verbose log information
+ */
+ void getShortLog(float time, char *s);
+
+ /*
+ * Get overall simplified statistics
+ */
+ void getStatistics(float time, char *s);
+
+
+private:
+ /*
+ * Struct for list of RTP packets in flight
+ */
+ struct Transmitted {
+ uint64_t timeTx_us;
+ uint32_t timestamp;
+ int size;
+ uint16_t seqNr;
+ bool isUsed;
+ bool isAcked;
+ bool isAfterReceivedEdge;
+
+ };
+
+ /*
+ * Statistics for the network congestion control and the
+ * stream[0]
+ */
+ class Statistics {
+ public:
+ Statistics();
+ void getSummary(float time, char s[]);
+ void add(float rateTx, float rateLost, float rtt, float queueDelay);
+ private:
+ float lossRateHist[kLossRateHistSize];
+ float rateLostAcc;
+ int rateLostN;
+ int lossRateHistPtr;
+ float avgRateTx;
+ float avgRtt;
+ float avgQueueDelay;
+ float sumRateTx;
+ float sumRateLost;
+
+ };
+
+
+ /*
+ * One instance is created for each {SSRC,PT} tuple
+ */
+ class Stream {
+ public:
+ Stream(ScreamTx *parent,
+ RtpQueueIface *rtpQueue,
+ uint32_t ssrc,
+ float priority,
+ float minBitrate,
+ float startBitrate,
+ float maxBitrate,
+ float rampUpSpeed,
+ float maxRtpQueueDelay,
+ float txQueueSizeFactor,
+ float queueDelayGuard,
+ float lossEventRateScale,
+ float ecnCeEventRateScale);
+
+ float getMaxRate();
+
+ float getTargetBitrate();
+
+ void updateRate(uint64_t time_us);
+
+ void updateTargetBitrateI(float br);
+
+ void updateTargetBitrate(uint64_t time_us);
+
+ bool isRtpQueueDiscard();
+
+ bool isMatch(uint32_t ssrc_) { return ssrc == ssrc_; };
+ ScreamTx *parent;
+ RtpQueueIface *rtpQueue; // RTP Packet queue
+ uint32_t ssrc; // SSRC of stream
+ float rampUpSpeed;
+ float maxRtpQueueDelay;
+ float txQueueSizeFactor;
+ float queueDelayGuard;
+ float lossEventRateScale;
+ float ecnCeEventRateScale;
+
+ int credit; // Credit that is received if another stream gets
+ // priority to transmit
+ int creditLost; // Amount of lost (unused) credit, input to
+ // adjustPriorities function
+ float targetPriority; // Stream target priority
+ float targetPriorityInv;// Stream target priority inverted
+ int bytesTransmitted; // Number of bytes transmitted
+ int bytesAcked; // Number of ACKed bytes
+ int bytesLost; // Number of lost bytes
+ float rateTransmitted; // Transmitted rate
+ float rateAcked; // ACKed rate
+ float rateLost; // Lost packets (bit)rate
+ uint16_t hiSeqAck; // Highest sequence number ACKed
+ uint16_t hiSeqTx; // Highest sequence number transmitted
+ float minBitrate; // Min bitrate
+ float maxBitrate; // Max bitrate
+ float targetBitrate; // Target bitrate
+ float targetBitrateI; // Target bitrate inflection point
+ bool wasFastStart; // Was fast start
+ bool lossEventFlag; // Was loss event
+ bool ecnCeEventFlag; // Was ECN mark event
+ float txSizeBitsAvg; // Avergage nymber of bits in RTP queue
+ uint64_t lastBitrateAdjustT_us; // Last time rate was updated for this stream
+ uint64_t lastRateUpdateT_us; // Last time rate estimate was updated
+ uint64_t lastTargetBitrateIUpdateT_us; // Last time rate estimate was updated
+
+ uint64_t timeTxAck_us; // timestamp when higest ACKed SN was transmitted
+
+ int bytesRtp; // Number of RTP bytes from media coder
+ float rateRtp; // Media bitrate
+ float rateRtpHist[kRateUpDateSize];
+ float rateAckedHist[kRateUpDateSize];
+ float rateLostHist[kRateUpDateSize];
+ float rateTransmittedHist[kRateUpDateSize];
+ int rateUpdateHistPtr;
+ float targetBitrateHist[kTargetBitrateHistSize];
+ int targetBitrateHistPtr;
+ uint64_t targetBitrateHistUpdateT_us;
+ float targetRateScale;
+
+ bool isActive;
+ uint64_t lastFrameT_us;
+ uint64_t initTime_us;
+ bool rtpQueueDiscard;
+ uint64_t lastRtpQueueDiscardT_us;
+ bool wasRepairLoss;
+ bool repairLoss;
+ int lastLossDetectIx;
+ uint16_t ecnCeMarkedBytes;
+
+
+ Transmitted txPackets[kMaxTxPackets];
+ int txPacketsPtr;
+
+ };
+
+ /*
+ * Initialize values
+ */
+ void initialize(uint64_t time_us);
+
+ /*
+ * Mark ACKed RTP packets
+ */
+ void markAcked(uint64_t time_us, struct Transmitted *txPackets, uint16_t highestSeqNr, uint64_t ackVector, uint32_t timestamp, Stream *stream);
+
+ /*
+ * Update CWND
+ */
+ void updateCwnd(uint64_t time_us);
+
+ /*
+ * Detect lost RTP packets
+ */
+ void detectLoss(uint64_t time_us, struct Transmitted *txPackets, uint16_t highestSeqNr, Stream *stream);
+
+ /*
+ * Call this function at regular intervals to determine active streams
+ */
+ void determineActiveStreams(uint64_t time_us);
+
+ /*
+ * Compute 1st order prediction coefficient of queue delay multiplied by the queue delay fraction
+ * A value [0.0..1.0] indicates if queue delay is increasing
+ * This gives a rough estimate of how the queuing delay delay evolves
+ */
+ void computeQueueDelayTrend();
+
+ /*
+ * Estimate one way delay [jiffy] and updated base delay
+ * Base delay is not subtracted
+ */
+ uint32_t estimateOwd(uint64_t time_us);
+
+ /*
+ * return base delay [jiffy]
+ */
+ uint32_t getBaseOwd();
+
+ /*
+ * Compute indicators of shared bottleneck
+ */
+ void computeSbd();
+
+ /*
+ * True if competing (TCP)flows detected
+ */
+ bool isCompetingFlows();
+
+ /*
+ * Get stream with corresponding SSRC
+ */
+ Stream* getStream(uint32_t ssrc);
+
+ /*
+ * Get matching stream index for this SSRC tuple,
+ * return -1 if no match
+ */
+ int getStreamIndex(uint32_t ssrc);
+
+ /*
+ * Adjust stream bitrates to reflect priorities
+ */
+ void adjustPriorities(uint64_t time_us);
+
+ /*
+ * Get the prioritized stream
+ * Return NULL if no stream with
+ * with RTP packets
+ */
+ Stream* getPrioritizedStream(uint64_t time_us);
+
+ /*
+ * Add credit to unserved streams
+ */
+ void addCredit(uint64_t time_us,
+ Stream* servedStream,
+ int transmittedBytes);
+
+ /*
+ * Subtract used credit
+ */
+ void subtractCredit(uint64_t time_us,
+ Stream* servedStream,
+ int transmittedBytes);
+
+ /*
+ * return 1 if in fast start
+ */
+ int isInFastStart() { return inFastStart ? 1 : 0; };
+
+ /*
+ * Get the fraction between queue delay and the queue delay target
+ */
+ float getQueueDelayFraction();
+
+ /*
+ * Get the queuing delay trend
+ */
+ float getQueueDelayTrend();
+
+ /*
+ * Variables for network congestion control
+ */
+
+ /*
+ * Related to computation of queue delay and target queuing delay
+ */
+ float lossBeta;
+ float ecnCeBeta;
+ float queueDelayTargetMin;
+ bool enableSbd;
+ float gainUp;
+ float gainDown;
+ float cautiousPacing;
+
+ uint64_t sRttSh_us;
+ uint64_t sRtt_us;
+ float sRtt;
+ uint32_t ackedOwd;
+ uint32_t baseOwd;
+
+ uint32_t baseOwdHist[kBaseOwdHistSize];
+ int baseOwdHistPtr;
+ uint32_t baseOwdHistMin;
+ float queueDelay;
+ float queueDelayFractionAvg;
+ float queueDelayFractionHist[kQueueDelayFractionHistSize];
+ int queueDelayFractionHistPtr;
+ float queueDelayTrend;
+ float queueDelayTarget;
+ float queueDelayNormHist[kQueueDelayNormHistSize];
+ int queueDelayNormHistPtr;
+ float queueDelaySbdVar;
+ float queueDelaySbdMean;
+ float queueDelaySbdSkew;
+ float queueDelaySbdMeanSh;
+ float queueDelayMax;
+
+ /*
+ * CWND management
+ */
+ int bytesNewlyAcked;
+ int mss; // Maximum Segment Size
+ int cwnd; // congestion window
+ int cwndMin;
+ bool openWindow;
+ int bytesInFlight;
+ int bytesInFlightHistLo[kBytesInFlightHistSizeMax];
+ int bytesInFlightHistHi[kBytesInFlightHistSizeMax];
+ int bytesInFlightHistSize;
+ int bytesInFlightHistPtr;
+ int bytesInFlightMaxLo;
+ int bytesInFlightHistLoMem;
+ int bytesInFlightMaxHi;
+ int bytesInFlightHistHiMem;
+ float maxBytesInFlight;
+ int accBytesInFlightMax;
+ int nAccBytesInFlightMax;
+ float rateTransmitted;
+ float rateAcked;
+ float queueDelayTrendMem;
+ float maxRate;
+ uint64_t lastCwndUpdateT_us;
+
+ /*
+ * Loss event
+ */
+ bool lossEvent;
+ bool wasLossEvent;
+ float lossEventRate;
+
+ /*
+ * ECN-CE
+ */
+ bool ecnCeEvent;
+
+ /*
+ * Fast start
+ */
+ bool inFastStart;
+
+ /*
+ * Transmission scheduling
+ */
+ uint64_t paceInterval_us;
+ float paceInterval;
+ float rateTransmittedAvg;
+
+ /*
+ * Update control variables
+ */
+ bool isInitialized;
+ uint64_t lastSRttUpdateT_us;
+ uint64_t lastBaseOwdAddT_us;
+ uint64_t baseOwdResetT_us;
+ uint64_t lastAddToQueueDelayFractionHistT_us;
+ uint64_t lastBytesInFlightT_us;
+ uint64_t lastCongestionDetectedT_us;
+ uint64_t lastLossEventT_us;
+ uint64_t lastTransmitT_us;
+ uint64_t nextTransmitT_us;
+ uint64_t lastRateUpdateT_us;
+ uint64_t lastAdjustPrioritiesT_us;
+ uint64_t lastRttT_us;
+ uint64_t lastBaseDelayRefreshT_us;
+ uint64_t initTime_us;
+ float queueDelayMin;
+ float queueDelayMinAvg;
+
+ /*
+ * Variables for multiple steams handling
+ */
+ Stream *streams[kMaxStreams];
+ int nStreams;
+
+ /*
+ * Statistics
+ */
+ Statistics *statistics;
+
+};
+#endif
diff --git a/Laptop/scream/scream_receiver/code/cmake_install.cmake b/Laptop/scream/scream_receiver/code/cmake_install.cmake
new file mode 100644
index 0000000000000000000000000000000000000000..319b6ed74fc2d3724d793663ac0e366a1c591aa0
--- /dev/null
+++ b/Laptop/scream/scream_receiver/code/cmake_install.cmake
@@ -0,0 +1,34 @@
+# Install script for directory: /home/robert/scream/scream_receiver/code
+
+# Set the install prefix
+if(NOT DEFINED CMAKE_INSTALL_PREFIX)
+ set(CMAKE_INSTALL_PREFIX "/usr/local")
+endif()
+string(REGEX REPLACE "/$" "" CMAKE_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}")
+
+# Set the install configuration name.
+if(NOT DEFINED CMAKE_INSTALL_CONFIG_NAME)
+ if(BUILD_TYPE)
+ string(REGEX REPLACE "^[^A-Za-z0-9_]+" ""
+ CMAKE_INSTALL_CONFIG_NAME "${BUILD_TYPE}")
+ else()
+ set(CMAKE_INSTALL_CONFIG_NAME "")
+ endif()
+ message(STATUS "Install configuration: \"${CMAKE_INSTALL_CONFIG_NAME}\"")
+endif()
+
+# Set the component getting installed.
+if(NOT CMAKE_INSTALL_COMPONENT)
+ if(COMPONENT)
+ message(STATUS "Install component: \"${COMPONENT}\"")
+ set(CMAKE_INSTALL_COMPONENT "${COMPONENT}")
+ else()
+ set(CMAKE_INSTALL_COMPONENT)
+ endif()
+endif()
+
+# Install shared libraries without execute permission?
+if(NOT DEFINED CMAKE_INSTALL_SO_NO_EXE)
+ set(CMAKE_INSTALL_SO_NO_EXE "1")
+endif()
+
diff --git a/Laptop/scream/scream_receiver/code/scream_receiver.cpp b/Laptop/scream/scream_receiver/code/scream_receiver.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..33da68594e7f78c63b8d5c4d577d03f324f85654
--- /dev/null
+++ b/Laptop/scream/scream_receiver/code/scream_receiver.cpp
@@ -0,0 +1,317 @@
+// Scream sender side wrapper
+#include "ScreamRx.h"
+#include "sys/socket.h"
+#include "sys/types.h"
+#include "netinet/in.h"
+#include <string.h> /* needed for memset */
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <sys/time.h>
+#include <iostream>
+#include <fcntl.h>
+#include <unistd.h>
+#include <pthread.h>
+using namespace std;
+
+/*
+* Scream receiver side wrapper
+* Receives SCReAM congestion controlled RTP media and
+* generates RTCP feedback to the sender, over the same RTP port
+* Media sources (max 6) are demultiplexed and forwarded to local RTP ports
+* given by local_port list
+*/
+
+#define BUFSIZE 2048
+
+#define MAX_SOURCES 6
+uint32_t SSRC_RTCP=10;
+
+
+// Input UDP socket, RTP packets come here and we send RTCP packets in the
+// reverse direction through this socket
+int fd_in_rtp;
+
+ScreamRx *screamRx = 0;
+
+
+int fd_local_rtp[MAX_SOURCES];
+uint32_t ssrcMap[MAX_SOURCES];
+
+char* in_ip = "192.168.0.20";
+int in_port = 30122;
+struct sockaddr_in in_rtp_addr, out_rtcp_addr, sender_rtcp_addr;
+struct sockaddr_in local_rtp_addr[MAX_SOURCES];
+
+char* local_ip = "127.0.0.1";
+int local_port[MAX_SOURCES] = {30130,30132,30134,30136,30138,30140};
+int nSources = 0;
+
+pthread_mutex_t lock_scream;
+
+long getTimeInUs(){
+ struct timeval tp;
+ gettimeofday(&tp, NULL);
+ long us = tp.tv_sec * 1000000 + tp.tv_usec;
+ return us;
+}
+
+/*
+Extract the sequence number and the timestamp from the RTP header
+0 1 2 3
+0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+|V=2|P|X| CC |M| PT | sequence number |
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+| timestamp |
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+| synchronization source (SSRC) identifier |
++=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
+| contributing source (CSRC) identifiers |
+| .... |
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*/
+
+void parseRtp(unsigned char *buf, uint16_t* seqNr, uint32_t* timeStamp, uint32_t* ssrc) {
+ uint16_t tmp_s;
+ uint32_t tmp_l;
+ memcpy(&tmp_s, buf + 2, 2);
+ *seqNr = ntohs(tmp_s);
+ memcpy(&tmp_l, buf + 4, 4);
+ *timeStamp = ntohl(tmp_l);
+ memcpy(&tmp_l, buf + 8, 4);
+ *ssrc = ntohl(tmp_l);
+}
+
+uint64_t lastPunchNatT_us = 0;
+
+#define KEEP_ALIVE_PKT_SIZE 1
+
+void *rtcpPeriodicThread(void *arg) {
+ unsigned char buf[BUFSIZE];
+ int rtcpSize;
+ uint64_t rtcpFbInterval_us = screamRx->getRtcpFbInterval();
+ for (;;) {
+ uint64_t time_us = getTimeInUs();
+
+ if (getTimeInUs() - lastPunchNatT_us > 500000) {
+ /*
+ * Send a small packet just to punch open a hole in the NAT,
+ * just one single byte will do.
+ * This makes in possible to receive packets on the same port
+ */
+ int ret = sendto(fd_in_rtp, buf, KEEP_ALIVE_PKT_SIZE, 0, (struct sockaddr *)&out_rtcp_addr, sizeof(out_rtcp_addr));
+ lastPunchNatT_us = getTimeInUs();
+ cerr << "." << endl;
+ }
+
+ if (screamRx->isFeedback(time_us) &&
+ (screamRx->checkIfFlushAck() ||
+ (time_us - screamRx->getLastFeedbackT() > rtcpFbInterval_us))) {
+ rtcpFbInterval_us = screamRx->getRtcpFbInterval();
+
+ pthread_mutex_lock(&lock_scream);
+ screamRx->createFeedback(time_us, buf, rtcpSize);
+ pthread_mutex_unlock(&lock_scream);
+ sendto(fd_in_rtp, buf, rtcpSize, 0, (struct sockaddr *)&out_rtcp_addr, sizeof(out_rtcp_addr));
+ lastPunchNatT_us = getTimeInUs();
+ }
+ usleep(500);
+ }
+}
+
+#define MAX_CTRL_SIZE 8192
+#define MAX_BUF_SIZE 65536
+#define ALL_CODE
+
+int main(int argc, char* argv[])
+{
+ unsigned char bufRtp[BUFSIZE];
+ if (argc <= 1) {
+ cerr << "Usage :" << endl << " >scream_receiver incoming_ip incoming_port" << endl;
+ exit(-1);
+ }
+ in_ip = argv[1];
+ in_port = atoi(argv[2]);
+
+
+ screamRx = new ScreamRx(SSRC_RTCP);
+
+ in_rtp_addr.sin_family = AF_INET;
+ in_rtp_addr.sin_addr.s_addr = htonl(INADDR_ANY);
+ in_rtp_addr.sin_port = htons(in_port);
+
+ if ((fd_in_rtp = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+ perror("cannot create socket for incoming RTP packets");
+ return 0;
+ }
+
+ out_rtcp_addr.sin_family = AF_INET;
+ inet_aton(in_ip,(in_addr*) &out_rtcp_addr.sin_addr.s_addr);
+ out_rtcp_addr.sin_port = htons(in_port);
+
+ for (int n=0; n < MAX_SOURCES; n++) {
+ local_rtp_addr[n].sin_family = AF_INET;
+ inet_aton(local_ip,(in_addr*) &local_rtp_addr[n].sin_addr.s_addr);
+ local_rtp_addr[n].sin_port = htons(local_port[n]);
+ if ((fd_local_rtp[n] = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+ perror("cannot create socket for outgoing RTP packets to renderer (video decoder)");
+ return 0;
+ }
+ }
+
+ int enable = 1;
+ if (setsockopt(fd_in_rtp, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(int)) < 0) {
+ perror("setsockopt(SO_REUSEADDR) failed");
+ }
+ unsigned char set = 0x03;
+ if (setsockopt(fd_in_rtp, IPPROTO_IP, IP_RECVTOS, &set,sizeof(set)) < 0) {
+ cerr << "cannot set recvtos on incoming socket" << endl;
+ } else {
+ cerr << "socket set to recvtos" << endl;
+ }
+
+ if (bind(fd_in_rtp, (struct sockaddr *)&in_rtp_addr, sizeof(in_rtp_addr)) < 0) {
+ perror("bind incoming_rtp_addr failed");
+ return 0;
+ } else{
+ cerr << "Listen on port " << in_port <<" to receive RTP from sender, this is the new version " << endl;
+ }
+
+ struct sockaddr_in sender_rtp_addr;
+ socklen_t addrlen_sender_rtp_addr = sizeof(sender_rtp_addr);
+
+ int recvlen;
+
+ uint64_t last_received_time = 0;
+ uint32_t receivedRtp = 0;
+
+ /*
+ * Send a small packet just to punch open a hole in the NAT,
+ * just one single byte will do.
+ * This makes in possible to receive packets on the same port
+ */
+ sendto(fd_in_rtp, bufRtp, KEEP_ALIVE_PKT_SIZE, 0, (struct sockaddr *)&out_rtcp_addr, sizeof(out_rtcp_addr));
+ lastPunchNatT_us = getTimeInUs();
+
+ pthread_t rtcp_thread;
+ pthread_mutex_init(&lock_scream, NULL);
+ pthread_create(&rtcp_thread, NULL, rtcpPeriodicThread, "Periodic RTCP thread...");
+
+ int *ecnptr;
+ unsigned char received_ecn;
+
+ struct msghdr rcv_msg;
+ struct iovec rcv_iov[1];
+ char rcv_ctrl_data[MAX_CTRL_SIZE];
+ char rcv_buf[MAX_BUF_SIZE];
+
+ /* Prepare message for receiving */
+ rcv_iov[0].iov_base = rcv_buf;
+ rcv_iov[0].iov_len = MAX_BUF_SIZE;
+
+ rcv_msg.msg_name = NULL; // Socket is connected
+ rcv_msg.msg_namelen = 0;
+ rcv_msg.msg_iov = rcv_iov;
+ rcv_msg.msg_iovlen = 1;
+ rcv_msg.msg_control = rcv_ctrl_data;
+ rcv_msg.msg_controllen = MAX_CTRL_SIZE;
+
+ for (;;) {
+ /*
+ * Wait for incoing RTP packet, this call can be blocking
+ */
+
+ /*
+ * Extract ECN bits
+ */
+ int recvlen = recvmsg(fd_in_rtp, &rcv_msg, 0);
+ bool isEcnCe = false;
+ if (recvlen == -1) {
+ perror("recvmsg()");
+ close(fd_in_rtp);
+ return EXIT_FAILURE;
+ } else {
+ struct cmsghdr *cmptr;
+ int *ecnptr;
+ unsigned char received_ecn;
+ for (cmptr = CMSG_FIRSTHDR(&rcv_msg);
+ cmptr != NULL;
+ cmptr = CMSG_NXTHDR(&rcv_msg, cmptr)) {
+ if (cmptr->cmsg_level == IPPROTO_IP && cmptr->cmsg_type == IP_TOS) {
+ ecnptr = (int*)CMSG_DATA(cmptr);
+ received_ecn = *ecnptr;
+ if (received_ecn == 0x3)
+ isEcnCe = true;
+ }
+ }
+ memcpy(bufRtp,rcv_msg.msg_iov[0].iov_base,recvlen);
+ }
+ uint64_t time_us = getTimeInUs();
+ if (recvlen > 1) {
+ if (bufRtp[1] == 0x7F) {
+ // Packet contains statistics
+ recvlen -= 2; // 2 bytes
+ char s[1000];
+ memcpy(s,&bufRtp[2],recvlen);
+ s[recvlen] = 0x00;
+ cout << s << endl;
+ } else if (bufRtp[1] == 0x7E) {
+ // Packet contains an SSRC map
+ nSources = (recvlen-2)/4;
+ for (int n=0; n < nSources; n++) {
+ uint32_t tmp_l;
+ memcpy(&tmp_l, bufRtp+2+n*4, 4);
+ ssrcMap[n] = ntohl(tmp_l);
+ }
+ } else {
+ if (time_us - last_received_time > 2000000) {
+ /*
+ * It's been more than 5 seconds since we last received an RTP packet
+ * let's reset everything to be on the safe side
+ */
+ receivedRtp = 0;
+ pthread_mutex_lock(&lock_scream);
+ delete screamRx;
+ screamRx = new ScreamRx(SSRC_RTCP);
+ pthread_mutex_unlock(&lock_scream);
+ cerr << "Receiver state reset due to idle input" << endl;
+ }
+ last_received_time = time_us;
+ receivedRtp++;
+
+ /*
+ * Parse RTP header
+ */
+ uint16_t seqNr;
+ uint32_t ts;
+ uint32_t ssrc;
+ parseRtp(bufRtp,&seqNr, &ts, &ssrc);
+
+ /*
+ * Map the RTP packets to correct display by means of the ssrcMap
+ */
+ int ix = -1;
+ for (int n=0; n < nSources; n++) {
+ if (ssrc == ssrcMap[n]) {
+ ix = n;
+ break;
+ }
+ }
+ if (ix != -1) {
+ /*
+ * Forward RTP packet to the correct internal port, for e.g GStreamer playout
+ */
+ sendto(fd_local_rtp[ix], bufRtp, recvlen, 0, (struct sockaddr *)&local_rtp_addr[ix], sizeof(local_rtp_addr[ix]));
+ }
+
+ /*
+ * Register received RTP packet with ScreamRx
+ */
+ pthread_mutex_lock(&lock_scream);
+ screamRx->receive(time_us, 0, ssrc, recvlen, seqNr, isEcnCe);
+ pthread_mutex_unlock(&lock_scream);
+ }
+ }
+ }
+}
diff --git a/Laptop/scream/scream_sender/CMakeCache.txt b/Laptop/scream/scream_sender/CMakeCache.txt
new file mode 100644
index 0000000000000000000000000000000000000000..56811c77eda4db836ae853dc4db346747f50649d
--- /dev/null
+++ b/Laptop/scream/scream_sender/CMakeCache.txt
@@ -0,0 +1,255 @@
+# This is the CMakeCache file.
+# For build in directory: /home/user/scream_panasonic/scream_sender
+# It was generated by CMake: /usr/bin/cmake
+# You can edit this file to change values found and used by cmake.
+# If you do not want to change any of the values, simply exit the editor.
+# If you do want to change a value, simply edit, save, and exit the editor.
+# The syntax for the file is as follows:
+# KEY:TYPE=VALUE
+# KEY is the name of a variable in the cache.
+# TYPE is a hint to GUIs for the type of VALUE, DO NOT EDIT TYPE!.
+# VALUE is the current value for the KEY.
+
+########################
+# EXTERNAL cache entries
+########################
+
+//Choose the type of build, options are: None(CMAKE_CXX_FLAGS or
+// CMAKE_C_FLAGS used) Debug Release RelWithDebInfo MinSizeRel.
+CMAKE_BUILD_TYPE:STRING=
+
+//Enable/Disable color output during build.
+CMAKE_COLOR_MAKEFILE:BOOL=ON
+
+//Flags used by the compiler during all build types.
+CMAKE_CXX_FLAGS:STRING=
+
+//Flags used by the compiler during debug builds.
+CMAKE_CXX_FLAGS_DEBUG:STRING=-g
+
+//Flags used by the compiler during release builds for minimum
+// size.
+CMAKE_CXX_FLAGS_MINSIZEREL:STRING=-Os -DNDEBUG
+
+//Flags used by the compiler during release builds.
+CMAKE_CXX_FLAGS_RELEASE:STRING=-O3 -DNDEBUG
+
+//Flags used by the compiler during release builds with debug info.
+CMAKE_CXX_FLAGS_RELWITHDEBINFO:STRING=-O2 -g -DNDEBUG
+
+//Flags used by the compiler during all build types.
+CMAKE_C_FLAGS:STRING=
+
+//Flags used by the compiler during debug builds.
+CMAKE_C_FLAGS_DEBUG:STRING=-g
+
+//Flags used by the compiler during release builds for minimum
+// size.
+CMAKE_C_FLAGS_MINSIZEREL:STRING=-Os -DNDEBUG
+
+//Flags used by the compiler during release builds.
+CMAKE_C_FLAGS_RELEASE:STRING=-O3 -DNDEBUG
+
+//Flags used by the compiler during release builds with debug info.
+CMAKE_C_FLAGS_RELWITHDEBINFO:STRING=-O2 -g -DNDEBUG
+
+//Flags used by the linker.
+CMAKE_EXE_LINKER_FLAGS:STRING=
+
+//Flags used by the linker during debug builds.
+CMAKE_EXE_LINKER_FLAGS_DEBUG:STRING=
+
+//Flags used by the linker during release minsize builds.
+CMAKE_EXE_LINKER_FLAGS_MINSIZEREL:STRING=
+
+//Flags used by the linker during release builds.
+CMAKE_EXE_LINKER_FLAGS_RELEASE:STRING=
+
+//Flags used by the linker during Release with Debug Info builds.
+CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO:STRING=
+
+//Enable/Disable output of compile commands during generation.
+CMAKE_EXPORT_COMPILE_COMMANDS:BOOL=OFF
+
+//Install path prefix, prepended onto install directories.
+CMAKE_INSTALL_PREFIX:PATH=/usr/local
+
+//Path to a program.
+CMAKE_MAKE_PROGRAM:FILEPATH=/usr/bin/make
+
+//Flags used by the linker during the creation of modules.
+CMAKE_MODULE_LINKER_FLAGS:STRING=
+
+//Flags used by the linker during debug builds.
+CMAKE_MODULE_LINKER_FLAGS_DEBUG:STRING=
+
+//Flags used by the linker during release minsize builds.
+CMAKE_MODULE_LINKER_FLAGS_MINSIZEREL:STRING=
+
+//Flags used by the linker during release builds.
+CMAKE_MODULE_LINKER_FLAGS_RELEASE:STRING=
+
+//Flags used by the linker during Release with Debug Info builds.
+CMAKE_MODULE_LINKER_FLAGS_RELWITHDEBINFO:STRING=
+
+//Value Computed by CMake
+CMAKE_PROJECT_NAME:STATIC=scream
+
+//Flags used by the linker during the creation of dll's.
+CMAKE_SHARED_LINKER_FLAGS:STRING=
+
+//Flags used by the linker during debug builds.
+CMAKE_SHARED_LINKER_FLAGS_DEBUG:STRING=
+
+//Flags used by the linker during release minsize builds.
+CMAKE_SHARED_LINKER_FLAGS_MINSIZEREL:STRING=
+
+//Flags used by the linker during release builds.
+CMAKE_SHARED_LINKER_FLAGS_RELEASE:STRING=
+
+//Flags used by the linker during Release with Debug Info builds.
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+# define COMPILER_VERSION_MINOR HEX(__SUNPRO_C>>4 & 0xFF)
+# define COMPILER_VERSION_PATCH HEX(__SUNPRO_C & 0xF)
+# else
+ /* __SUNPRO_CC = 0xVRP */
+# define COMPILER_VERSION_MAJOR HEX(__SUNPRO_C>>8)
+# define COMPILER_VERSION_MINOR HEX(__SUNPRO_C>>4 & 0xF)
+# define COMPILER_VERSION_PATCH HEX(__SUNPRO_C & 0xF)
+# endif
+
+#elif defined(__HP_cc)
+# define COMPILER_ID "HP"
+ /* __HP_cc = VVRRPP */
+# define COMPILER_VERSION_MAJOR DEC(__HP_cc/10000)
+# define COMPILER_VERSION_MINOR DEC(__HP_cc/100 % 100)
+# define COMPILER_VERSION_PATCH DEC(__HP_cc % 100)
+
+#elif defined(__DECC)
+# define COMPILER_ID "Compaq"
+ /* __DECC_VER = VVRRTPPPP */
+# define COMPILER_VERSION_MAJOR DEC(__DECC_VER/10000000)
+# define COMPILER_VERSION_MINOR DEC(__DECC_VER/100000 % 100)
+# define COMPILER_VERSION_PATCH DEC(__DECC_VER % 10000)
+
+#elif defined(__IBMC__) && defined(__COMPILER_VER__)
+# define COMPILER_ID "zOS"
+ /* __IBMC__ = VRP */
+# define COMPILER_VERSION_MAJOR DEC(__IBMC__/100)
+# define COMPILER_VERSION_MINOR DEC(__IBMC__/10 % 10)
+# define COMPILER_VERSION_PATCH DEC(__IBMC__ % 10)
+
+#elif defined(__IBMC__) && !defined(__COMPILER_VER__) && __IBMC__ >= 800
+# define COMPILER_ID "XL"
+ /* __IBMC__ = VRP */
+# define COMPILER_VERSION_MAJOR DEC(__IBMC__/100)
+# define COMPILER_VERSION_MINOR DEC(__IBMC__/10 % 10)
+# define COMPILER_VERSION_PATCH DEC(__IBMC__ % 10)
+
+#elif defined(__IBMC__) && !defined(__COMPILER_VER__) && __IBMC__ < 800
+# define COMPILER_ID "VisualAge"
+ /* __IBMC__ = VRP */
+# define COMPILER_VERSION_MAJOR DEC(__IBMC__/100)
+# define COMPILER_VERSION_MINOR DEC(__IBMC__/10 % 10)
+# define COMPILER_VERSION_PATCH DEC(__IBMC__ % 10)
+
+#elif defined(__PGI)
+# define COMPILER_ID "PGI"
+# define COMPILER_VERSION_MAJOR DEC(__PGIC__)
+# define COMPILER_VERSION_MINOR DEC(__PGIC_MINOR__)
+# if defined(__PGIC_PATCHLEVEL__)
+# define COMPILER_VERSION_PATCH DEC(__PGIC_PATCHLEVEL__)
+# endif
+
+#elif defined(_CRAYC)
+# define COMPILER_ID "Cray"
+# define COMPILER_VERSION_MAJOR DEC(_RELEASE_MAJOR)
+# define COMPILER_VERSION_MINOR DEC(_RELEASE_MINOR)
+
+#elif defined(__TI_COMPILER_VERSION__)
+# define COMPILER_ID "TI"
+ /* __TI_COMPILER_VERSION__ = VVVRRRPPP */
+# define COMPILER_VERSION_MAJOR DEC(__TI_COMPILER_VERSION__/1000000)
+# define COMPILER_VERSION_MINOR DEC(__TI_COMPILER_VERSION__/1000 % 1000)
+# define COMPILER_VERSION_PATCH DEC(__TI_COMPILER_VERSION__ % 1000)
+
+#elif defined(__FUJITSU) || defined(__FCC_VERSION) || defined(__fcc_version)
+# define COMPILER_ID "Fujitsu"
+
+#elif defined(__TINYC__)
+# define COMPILER_ID "TinyCC"
+
+#elif defined(__BCC__)
+# define COMPILER_ID "Bruce"
+
+#elif defined(__SCO_VERSION__)
+# define COMPILER_ID "SCO"
+
+#elif defined(__clang__) && defined(__apple_build_version__)
+# define COMPILER_ID "AppleClang"
+# if defined(_MSC_VER)
+# define SIMULATE_ID "MSVC"
+# endif
+# define COMPILER_VERSION_MAJOR DEC(__clang_major__)
+# define COMPILER_VERSION_MINOR DEC(__clang_minor__)
+# define COMPILER_VERSION_PATCH DEC(__clang_patchlevel__)
+# if defined(_MSC_VER)
+ /* _MSC_VER = VVRR */
+# define SIMULATE_VERSION_MAJOR DEC(_MSC_VER / 100)
+# define SIMULATE_VERSION_MINOR DEC(_MSC_VER % 100)
+# endif
+# define COMPILER_VERSION_TWEAK DEC(__apple_build_version__)
+
+#elif defined(__clang__)
+# define COMPILER_ID "Clang"
+# if defined(_MSC_VER)
+# define SIMULATE_ID "MSVC"
+# endif
+# define COMPILER_VERSION_MAJOR DEC(__clang_major__)
+# define COMPILER_VERSION_MINOR DEC(__clang_minor__)
+# define COMPILER_VERSION_PATCH DEC(__clang_patchlevel__)
+# if defined(_MSC_VER)
+ /* _MSC_VER = VVRR */
+# define SIMULATE_VERSION_MAJOR DEC(_MSC_VER / 100)
+# define SIMULATE_VERSION_MINOR DEC(_MSC_VER % 100)
+# endif
+
+#elif defined(__GNUC__)
+# define COMPILER_ID "GNU"
+# define COMPILER_VERSION_MAJOR DEC(__GNUC__)
+# if defined(__GNUC_MINOR__)
+# define COMPILER_VERSION_MINOR DEC(__GNUC_MINOR__)
+# endif
+# if defined(__GNUC_PATCHLEVEL__)
+# define COMPILER_VERSION_PATCH DEC(__GNUC_PATCHLEVEL__)
+# endif
+
+#elif defined(_MSC_VER)
+# define COMPILER_ID "MSVC"
+ /* _MSC_VER = VVRR */
+# define COMPILER_VERSION_MAJOR DEC(_MSC_VER / 100)
+# define COMPILER_VERSION_MINOR DEC(_MSC_VER % 100)
+# if defined(_MSC_FULL_VER)
+# if _MSC_VER >= 1400
+ /* _MSC_FULL_VER = VVRRPPPPP */
+# define COMPILER_VERSION_PATCH DEC(_MSC_FULL_VER % 100000)
+# else
+ /* _MSC_FULL_VER = VVRRPPPP */
+# define COMPILER_VERSION_PATCH DEC(_MSC_FULL_VER % 10000)
+# endif
+# endif
+# if defined(_MSC_BUILD)
+# define COMPILER_VERSION_TWEAK DEC(_MSC_BUILD)
+# endif
+
+#elif defined(__VISUALDSPVERSION__) || defined(__ADSPBLACKFIN__) || defined(__ADSPTS__) || defined(__ADSP21000__)
+# define COMPILER_ID "ADSP"
+#if defined(__VISUALDSPVERSION__)
+ /* __VISUALDSPVERSION__ = 0xVVRRPP00 */
+# define COMPILER_VERSION_MAJOR HEX(__VISUALDSPVERSION__>>24)
+# define COMPILER_VERSION_MINOR HEX(__VISUALDSPVERSION__>>16 & 0xFF)
+# define COMPILER_VERSION_PATCH HEX(__VISUALDSPVERSION__>>8 & 0xFF)
+#endif
+
+#elif defined(__IAR_SYSTEMS_ICC__ ) || defined(__IAR_SYSTEMS_ICC)
+# define COMPILER_ID "IAR"
+
+#elif defined(__ARMCC_VERSION)
+# define COMPILER_ID "ARMCC"
+#if __ARMCC_VERSION >= 1000000
+ /* __ARMCC_VERSION = VRRPPPP */
+ # define COMPILER_VERSION_MAJOR DEC(__ARMCC_VERSION/1000000)
+ # define COMPILER_VERSION_MINOR DEC(__ARMCC_VERSION/10000 % 100)
+ # define COMPILER_VERSION_PATCH DEC(__ARMCC_VERSION % 10000)
+#else
+ /* __ARMCC_VERSION = VRPPPP */
+ # define COMPILER_VERSION_MAJOR DEC(__ARMCC_VERSION/100000)
+ # define COMPILER_VERSION_MINOR DEC(__ARMCC_VERSION/10000 % 10)
+ # define COMPILER_VERSION_PATCH DEC(__ARMCC_VERSION % 10000)
+#endif
+
+
+#elif defined(SDCC)
+# define COMPILER_ID "SDCC"
+ /* SDCC = VRP */
+# define COMPILER_VERSION_MAJOR DEC(SDCC/100)
+# define COMPILER_VERSION_MINOR DEC(SDCC/10 % 10)
+# define COMPILER_VERSION_PATCH DEC(SDCC % 10)
+
+#elif defined(_SGI_COMPILER_VERSION) || defined(_COMPILER_VERSION)
+# define COMPILER_ID "MIPSpro"
+# if defined(_SGI_COMPILER_VERSION)
+ /* _SGI_COMPILER_VERSION = VRP */
+# define COMPILER_VERSION_MAJOR DEC(_SGI_COMPILER_VERSION/100)
+# define COMPILER_VERSION_MINOR DEC(_SGI_COMPILER_VERSION/10 % 10)
+# define COMPILER_VERSION_PATCH DEC(_SGI_COMPILER_VERSION % 10)
+# else
+ /* _COMPILER_VERSION = VRP */
+# define COMPILER_VERSION_MAJOR DEC(_COMPILER_VERSION/100)
+# define COMPILER_VERSION_MINOR DEC(_COMPILER_VERSION/10 % 10)
+# define COMPILER_VERSION_PATCH DEC(_COMPILER_VERSION % 10)
+# endif
+
+
+/* These compilers are either not known or too old to define an
+ identification macro. Try to identify the platform and guess that
+ it is the native compiler. */
+#elif defined(__sgi)
+# define COMPILER_ID "MIPSpro"
+
+#elif defined(__hpux) || defined(__hpua)
+# define COMPILER_ID "HP"
+
+#else /* unknown compiler */
+# define COMPILER_ID ""
+#endif
+
+/* Construct the string literal in pieces to prevent the source from
+ getting matched. Store it in a pointer rather than an array
+ because some compilers will just produce instructions to fill the
+ array rather than assigning a pointer to a static array. */
+char const* info_compiler = "INFO" ":" "compiler[" COMPILER_ID "]";
+#ifdef SIMULATE_ID
+char const* info_simulate = "INFO" ":" "simulate[" SIMULATE_ID "]";
+#endif
+
+#ifdef __QNXNTO__
+char const* qnxnto = "INFO" ":" "qnxnto[]";
+#endif
+
+#if defined(__CRAYXE) || defined(__CRAYXC)
+char const *info_cray = "INFO" ":" "compiler_wrapper[CrayPrgEnv]";
+#endif
+
+#define STRINGIFY_HELPER(X) #X
+#define STRINGIFY(X) STRINGIFY_HELPER(X)
+
+/* Identify known platforms by name. */
+#if defined(__linux) || defined(__linux__) || defined(linux)
+# define PLATFORM_ID "Linux"
+
+#elif defined(__CYGWIN__)
+# define PLATFORM_ID "Cygwin"
+
+#elif defined(__MINGW32__)
+# define PLATFORM_ID "MinGW"
+
+#elif defined(__APPLE__)
+# define PLATFORM_ID "Darwin"
+
+#elif defined(_WIN32) || defined(__WIN32__) || defined(WIN32)
+# define PLATFORM_ID "Windows"
+
+#elif defined(__FreeBSD__) || defined(__FreeBSD)
+# define PLATFORM_ID "FreeBSD"
+
+#elif defined(__NetBSD__) || defined(__NetBSD)
+# define PLATFORM_ID "NetBSD"
+
+#elif defined(__OpenBSD__) || defined(__OPENBSD)
+# define PLATFORM_ID "OpenBSD"
+
+#elif defined(__sun) || defined(sun)
+# define PLATFORM_ID "SunOS"
+
+#elif defined(_AIX) || defined(__AIX) || defined(__AIX__) || defined(__aix) || defined(__aix__)
+# define PLATFORM_ID "AIX"
+
+#elif defined(__sgi) || defined(__sgi__) || defined(_SGI)
+# define PLATFORM_ID "IRIX"
+
+#elif defined(__hpux) || defined(__hpux__)
+# define PLATFORM_ID "HP-UX"
+
+#elif defined(__HAIKU__)
+# define PLATFORM_ID "Haiku"
+
+#elif defined(__BeOS) || defined(__BEOS__) || defined(_BEOS)
+# define PLATFORM_ID "BeOS"
+
+#elif defined(__QNX__) || defined(__QNXNTO__)
+# define PLATFORM_ID "QNX"
+
+#elif defined(__tru64) || defined(_tru64) || defined(__TRU64__)
+# define PLATFORM_ID "Tru64"
+
+#elif defined(__riscos) || defined(__riscos__)
+# define PLATFORM_ID "RISCos"
+
+#elif defined(__sinix) || defined(__sinix__) || defined(__SINIX__)
+# define PLATFORM_ID "SINIX"
+
+#elif defined(__UNIX_SV__)
+# define PLATFORM_ID "UNIX_SV"
+
+#elif defined(__bsdos__)
+# define PLATFORM_ID "BSDOS"
+
+#elif defined(_MPRAS) || defined(MPRAS)
+# define PLATFORM_ID "MP-RAS"
+
+#elif defined(__osf) || defined(__osf__)
+# define PLATFORM_ID "OSF1"
+
+#elif defined(_SCO_SV) || defined(SCO_SV) || defined(sco_sv)
+# define PLATFORM_ID "SCO_SV"
+
+#elif defined(__ultrix) || defined(__ultrix__) || defined(_ULTRIX)
+# define PLATFORM_ID "ULTRIX"
+
+#elif defined(__XENIX__) || defined(_XENIX) || defined(XENIX)
+# define PLATFORM_ID "Xenix"
+
+#elif defined(__WATCOMC__)
+# if defined(__LINUX__)
+# define PLATFORM_ID "Linux"
+
+# elif defined(__DOS__)
+# define PLATFORM_ID "DOS"
+
+# elif defined(__OS2__)
+# define PLATFORM_ID "OS2"
+
+# elif defined(__WINDOWS__)
+# define PLATFORM_ID "Windows3x"
+
+# else /* unknown platform */
+# define PLATFORM_ID
+# endif
+
+#else /* unknown platform */
+# define PLATFORM_ID
+
+#endif
+
+/* For windows compilers MSVC and Intel we can determine
+ the architecture of the compiler being used. This is because
+ the compilers do not have flags that can change the architecture,
+ but rather depend on which compiler is being used
+*/
+#if defined(_WIN32) && defined(_MSC_VER)
+# if defined(_M_IA64)
+# define ARCHITECTURE_ID "IA64"
+
+# elif defined(_M_X64) || defined(_M_AMD64)
+# define ARCHITECTURE_ID "x64"
+
+# elif defined(_M_IX86)
+# define ARCHITECTURE_ID "X86"
+
+# elif defined(_M_ARM)
+# if _M_ARM == 4
+# define ARCHITECTURE_ID "ARMV4I"
+# elif _M_ARM == 5
+# define ARCHITECTURE_ID "ARMV5I"
+# else
+# define ARCHITECTURE_ID "ARMV" STRINGIFY(_M_ARM)
+# endif
+
+# elif defined(_M_MIPS)
+# define ARCHITECTURE_ID "MIPS"
+
+# elif defined(_M_SH)
+# define ARCHITECTURE_ID "SHx"
+
+# else /* unknown architecture */
+# define ARCHITECTURE_ID ""
+# endif
+
+#elif defined(__WATCOMC__)
+# if defined(_M_I86)
+# define ARCHITECTURE_ID "I86"
+
+# elif defined(_M_IX86)
+# define ARCHITECTURE_ID "X86"
+
+# else /* unknown architecture */
+# define ARCHITECTURE_ID ""
+# endif
+
+#else
+# define ARCHITECTURE_ID
+#endif
+
+/* Convert integer to decimal digit literals. */
+#define DEC(n) \
+ ('0' + (((n) / 10000000)%10)), \
+ ('0' + (((n) / 1000000)%10)), \
+ ('0' + (((n) / 100000)%10)), \
+ ('0' + (((n) / 10000)%10)), \
+ ('0' + (((n) / 1000)%10)), \
+ ('0' + (((n) / 100)%10)), \
+ ('0' + (((n) / 10)%10)), \
+ ('0' + ((n) % 10))
+
+/* Convert integer to hex digit literals. */
+#define HEX(n) \
+ ('0' + ((n)>>28 & 0xF)), \
+ ('0' + ((n)>>24 & 0xF)), \
+ ('0' + ((n)>>20 & 0xF)), \
+ ('0' + ((n)>>16 & 0xF)), \
+ ('0' + ((n)>>12 & 0xF)), \
+ ('0' + ((n)>>8 & 0xF)), \
+ ('0' + ((n)>>4 & 0xF)), \
+ ('0' + ((n) & 0xF))
+
+/* Construct a string literal encoding the version number components. */
+#ifdef COMPILER_VERSION_MAJOR
+char const info_version[] = {
+ 'I', 'N', 'F', 'O', ':',
+ 'c','o','m','p','i','l','e','r','_','v','e','r','s','i','o','n','[',
+ COMPILER_VERSION_MAJOR,
+# ifdef COMPILER_VERSION_MINOR
+ '.', COMPILER_VERSION_MINOR,
+# ifdef COMPILER_VERSION_PATCH
+ '.', COMPILER_VERSION_PATCH,
+# ifdef COMPILER_VERSION_TWEAK
+ '.', COMPILER_VERSION_TWEAK,
+# endif
+# endif
+# endif
+ ']','\0'};
+#endif
+
+/* Construct a string literal encoding the version number components. */
+#ifdef SIMULATE_VERSION_MAJOR
+char const info_simulate_version[] = {
+ 'I', 'N', 'F', 'O', ':',
+ 's','i','m','u','l','a','t','e','_','v','e','r','s','i','o','n','[',
+ SIMULATE_VERSION_MAJOR,
+# ifdef SIMULATE_VERSION_MINOR
+ '.', SIMULATE_VERSION_MINOR,
+# ifdef SIMULATE_VERSION_PATCH
+ '.', SIMULATE_VERSION_PATCH,
+# ifdef SIMULATE_VERSION_TWEAK
+ '.', SIMULATE_VERSION_TWEAK,
+# endif
+# endif
+# endif
+ ']','\0'};
+#endif
+
+/* Construct the string literal in pieces to prevent the source from
+ getting matched. Store it in a pointer rather than an array
+ because some compilers will just produce instructions to fill the
+ array rather than assigning a pointer to a static array. */
+char const* info_platform = "INFO" ":" "platform[" PLATFORM_ID "]";
+char const* info_arch = "INFO" ":" "arch[" ARCHITECTURE_ID "]";
+
+
+
+
+#if !defined(__STDC__)
+# if defined(_MSC_VER) && !defined(__clang__)
+# define C_DIALECT "90"
+# else
+# define C_DIALECT
+# endif
+#elif __STDC_VERSION__ >= 201000L
+# define C_DIALECT "11"
+#elif __STDC_VERSION__ >= 199901L
+# define C_DIALECT "99"
+#else
+# define C_DIALECT "90"
+#endif
+const char* info_language_dialect_default =
+ "INFO" ":" "dialect_default[" C_DIALECT "]";
+
+/*--------------------------------------------------------------------------*/
+
+#ifdef ID_VOID_MAIN
+void main() {}
+#else
+# if defined(__CLASSIC_C__)
+int main(argc, argv) int argc; char *argv[];
+# else
+int main(int argc, char* argv[])
+# endif
+{
+ int require = 0;
+ require += info_compiler[argc];
+ require += info_platform[argc];
+ require += info_arch[argc];
+#ifdef COMPILER_VERSION_MAJOR
+ require += info_version[argc];
+#endif
+#ifdef SIMULATE_ID
+ require += info_simulate[argc];
+#endif
+#ifdef SIMULATE_VERSION_MAJOR
+ require += info_simulate_version[argc];
+#endif
+#if defined(__CRAYXE) || defined(__CRAYXC)
+ require += info_cray[argc];
+#endif
+ require += info_language_dialect_default[argc];
+ (void)argv;
+ return require;
+}
+#endif
diff --git a/Laptop/scream/scream_sender/CMakeFiles/3.7.2/CompilerIdC/a.out b/Laptop/scream/scream_sender/CMakeFiles/3.7.2/CompilerIdC/a.out
new file mode 100644
index 0000000000000000000000000000000000000000..2c9d824bf34e6384541157ce258ad086b4372b81
Binary files /dev/null and b/Laptop/scream/scream_sender/CMakeFiles/3.7.2/CompilerIdC/a.out differ
diff --git a/Laptop/scream/scream_sender/CMakeFiles/3.7.2/CompilerIdCXX/CMakeCXXCompilerId.cpp b/Laptop/scream/scream_sender/CMakeFiles/3.7.2/CompilerIdCXX/CMakeCXXCompilerId.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..a6e6bedec4f7adf424f8ebaf03d7dba4adbaa432
--- /dev/null
+++ b/Laptop/scream/scream_sender/CMakeFiles/3.7.2/CompilerIdCXX/CMakeCXXCompilerId.cpp
@@ -0,0 +1,533 @@
+/* This source file must have a .cpp extension so that all C++ compilers
+ recognize the extension without flags. Borland does not know .cxx for
+ example. */
+#ifndef __cplusplus
+# error "A C compiler has been selected for C++."
+#endif
+
+
+/* Version number components: V=Version, R=Revision, P=Patch
+ Version date components: YYYY=Year, MM=Month, DD=Day */
+
+#if defined(__COMO__)
+# define COMPILER_ID "Comeau"
+ /* __COMO_VERSION__ = VRR */
+# define COMPILER_VERSION_MAJOR DEC(__COMO_VERSION__ / 100)
+# define COMPILER_VERSION_MINOR DEC(__COMO_VERSION__ % 100)
+
+#elif defined(__INTEL_COMPILER) || defined(__ICC)
+# define COMPILER_ID "Intel"
+# if defined(_MSC_VER)
+# define SIMULATE_ID "MSVC"
+# endif
+ /* __INTEL_COMPILER = VRP */
+# define COMPILER_VERSION_MAJOR DEC(__INTEL_COMPILER/100)
+# define COMPILER_VERSION_MINOR DEC(__INTEL_COMPILER/10 % 10)
+# if defined(__INTEL_COMPILER_UPDATE)
+# define COMPILER_VERSION_PATCH DEC(__INTEL_COMPILER_UPDATE)
+# else
+# define COMPILER_VERSION_PATCH DEC(__INTEL_COMPILER % 10)
+# endif
+# if defined(__INTEL_COMPILER_BUILD_DATE)
+ /* __INTEL_COMPILER_BUILD_DATE = YYYYMMDD */
+# define COMPILER_VERSION_TWEAK DEC(__INTEL_COMPILER_BUILD_DATE)
+# endif
+# if defined(_MSC_VER)
+ /* _MSC_VER = VVRR */
+# define SIMULATE_VERSION_MAJOR DEC(_MSC_VER / 100)
+# define SIMULATE_VERSION_MINOR DEC(_MSC_VER % 100)
+# endif
+
+#elif defined(__PATHCC__)
+# define COMPILER_ID "PathScale"
+# define COMPILER_VERSION_MAJOR DEC(__PATHCC__)
+# define COMPILER_VERSION_MINOR DEC(__PATHCC_MINOR__)
+# if defined(__PATHCC_PATCHLEVEL__)
+# define COMPILER_VERSION_PATCH DEC(__PATHCC_PATCHLEVEL__)
+# endif
+
+#elif defined(__BORLANDC__) && defined(__CODEGEARC_VERSION__)
+# define COMPILER_ID "Embarcadero"
+# define COMPILER_VERSION_MAJOR HEX(__CODEGEARC_VERSION__>>24 & 0x00FF)
+# define COMPILER_VERSION_MINOR HEX(__CODEGEARC_VERSION__>>16 & 0x00FF)
+# define COMPILER_VERSION_PATCH DEC(__CODEGEARC_VERSION__ & 0xFFFF)
+
+#elif defined(__BORLANDC__)
+# define COMPILER_ID "Borland"
+ /* __BORLANDC__ = 0xVRR */
+# define COMPILER_VERSION_MAJOR HEX(__BORLANDC__>>8)
+# define COMPILER_VERSION_MINOR HEX(__BORLANDC__ & 0xFF)
+
+#elif defined(__WATCOMC__) && __WATCOMC__ < 1200
+# define COMPILER_ID "Watcom"
+ /* __WATCOMC__ = VVRR */
+# define COMPILER_VERSION_MAJOR DEC(__WATCOMC__ / 100)
+# define COMPILER_VERSION_MINOR DEC((__WATCOMC__ / 10) % 10)
+# if (__WATCOMC__ % 10) > 0
+# define COMPILER_VERSION_PATCH DEC(__WATCOMC__ % 10)
+# endif
+
+#elif defined(__WATCOMC__)
+# define COMPILER_ID "OpenWatcom"
+ /* __WATCOMC__ = VVRP + 1100 */
+# define COMPILER_VERSION_MAJOR DEC((__WATCOMC__ - 1100) / 100)
+# define COMPILER_VERSION_MINOR DEC((__WATCOMC__ / 10) % 10)
+# if (__WATCOMC__ % 10) > 0
+# define COMPILER_VERSION_PATCH DEC(__WATCOMC__ % 10)
+# endif
+
+#elif defined(__SUNPRO_CC)
+# define COMPILER_ID "SunPro"
+# if __SUNPRO_CC >= 0x5100
+ /* __SUNPRO_CC = 0xVRRP */
+# define COMPILER_VERSION_MAJOR HEX(__SUNPRO_CC>>12)
+# define COMPILER_VERSION_MINOR HEX(__SUNPRO_CC>>4 & 0xFF)
+# define COMPILER_VERSION_PATCH HEX(__SUNPRO_CC & 0xF)
+# else
+ /* __SUNPRO_CC = 0xVRP */
+# define COMPILER_VERSION_MAJOR HEX(__SUNPRO_CC>>8)
+# define COMPILER_VERSION_MINOR HEX(__SUNPRO_CC>>4 & 0xF)
+# define COMPILER_VERSION_PATCH HEX(__SUNPRO_CC & 0xF)
+# endif
+
+#elif defined(__HP_aCC)
+# define COMPILER_ID "HP"
+ /* __HP_aCC = VVRRPP */
+# define COMPILER_VERSION_MAJOR DEC(__HP_aCC/10000)
+# define COMPILER_VERSION_MINOR DEC(__HP_aCC/100 % 100)
+# define COMPILER_VERSION_PATCH DEC(__HP_aCC % 100)
+
+#elif defined(__DECCXX)
+# define COMPILER_ID "Compaq"
+ /* __DECCXX_VER = VVRRTPPPP */
+# define COMPILER_VERSION_MAJOR DEC(__DECCXX_VER/10000000)
+# define COMPILER_VERSION_MINOR DEC(__DECCXX_VER/100000 % 100)
+# define COMPILER_VERSION_PATCH DEC(__DECCXX_VER % 10000)
+
+#elif defined(__IBMCPP__) && defined(__COMPILER_VER__)
+# define COMPILER_ID "zOS"
+ /* __IBMCPP__ = VRP */
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+
+#=============================================================================
+# Special targets to cleanup operation of make.
+
+# Special rule to run CMake to check the build system integrity.
+# No rule that depends on this can have commands that come from listfiles
+# because they might be regenerated.
+cmake_check_build_system:
+ cd /home/user/scream_panasonic/scream_sender && $(CMAKE_COMMAND) -H$(CMAKE_SOURCE_DIR) -B$(CMAKE_BINARY_DIR) --check-build-system CMakeFiles/Makefile.cmake 0
+.PHONY : cmake_check_build_system
+
diff --git a/Laptop/scream/scream_sender/code/RtpQueue.cpp b/Laptop/scream/scream_sender/code/RtpQueue.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..47c1fb4ed09e07840207d19866ff7ddcacefe12f
--- /dev/null
+++ b/Laptop/scream/scream_sender/code/RtpQueue.cpp
@@ -0,0 +1,121 @@
+#include "RtpQueue.h"
+#include <iostream>
+#include <string.h>
+using namespace std;
+/*
+* Implements a simple RTP packet queue
+*/
+
+RtpQueueItem::RtpQueueItem() {
+ used = false;
+ size = 0;
+ seqNr = 0;
+}
+
+
+RtpQueue::RtpQueue() {
+ for (int n=0; n < kRtpQueueSize; n++) {
+ items[n] = new RtpQueueItem();
+ }
+ head = -1;
+ tail = 0;
+ nItems = 0;
+ sizeOfLastFrame = 0;
+ bytesInQueue_ = 0;
+ sizeOfQueue_ = 0;
+ sizeOfNextRtp_ = -1;
+}
+
+void RtpQueue::push(void *rtpPacket, int size, unsigned short seqNr, float ts) {
+ int ix = head+1;
+ if (ix == kRtpQueueSize) ix = 0;
+ if (items[ix]->used) {
+ /*
+ * RTP queue is full, do a drop tail i.e ignore new RTP packets
+ */
+ return;
+ }
+ head = ix;
+
+ memcpy(items[head]->packet, rtpPacket, size);
+ items[head]->seqNr = seqNr;
+ items[head]->size = size;
+ items[head]->ts = ts;
+ items[head]->used = true;
+ bytesInQueue_ += size;
+ sizeOfQueue_ += 1;
+ computeSizeOfNextRtp();
+}
+
+bool RtpQueue::pop(void *rtpPacket, int& size, unsigned short& seqNr) {
+ if (items[tail]->used == false) {
+ return false;
+ sizeOfNextRtp_ = -1;
+ } else {
+ size = items[tail]->size;
+ memcpy(rtpPacket,items[tail]->packet,size);
+ seqNr = items[tail]->seqNr;
+ items[tail]->used = false;
+ tail++; if (tail == kRtpQueueSize) tail = 0;
+ bytesInQueue_ -= size;
+ sizeOfQueue_ -= 1;
+ computeSizeOfNextRtp();
+ return true;
+ }
+}
+
+void RtpQueue::computeSizeOfNextRtp() {
+ if (!items[tail]->used) {
+ sizeOfNextRtp_ = - 1;
+ } else {
+ sizeOfNextRtp_ = items[tail]->size;
+ }
+}
+
+int RtpQueue::sizeOfNextRtp() {
+ return sizeOfNextRtp_;
+}
+
+int RtpQueue::seqNrOfNextRtp() {
+ if (!items[tail]->used) {
+ return -1;
+ } else {
+ return items[tail]->seqNr;
+ }
+}
+
+int RtpQueue::bytesInQueue() {
+ return bytesInQueue_;
+}
+
+int RtpQueue::sizeOfQueue() {
+ return sizeOfQueue_;
+}
+
+float RtpQueue::getDelay(float currTs) {
+ if (items[tail]->used == false) {
+ return 0;
+ } else {
+ return currTs-items[tail]->ts;
+ }
+}
+
+bool RtpQueue::sendPacket(void *rtpPacket, int& size, unsigned short& seqNr) {
+ if (sizeOfQueue() > 0) {
+ pop(rtpPacket, size, seqNr);
+ return true;
+ }
+ return false;
+}
+
+void RtpQueue::clear() {
+ for (int n=0; n < kRtpQueueSize; n++) {
+ items[n]->used = false;
+ }
+ head = -1;
+ tail = 0;
+ nItems = 0;
+ bytesInQueue_ = 0;
+ sizeOfQueue_ = 0;
+ sizeOfNextRtp_ = -1;
+}
diff --git a/Laptop/scream/scream_sender/code/RtpQueue.h b/Laptop/scream/scream_sender/code/RtpQueue.h
new file mode 100644
index 0000000000000000000000000000000000000000..82c6ac873e17204d4a96e767a7006fb8e08b3ebf
--- /dev/null
+++ b/Laptop/scream/scream_sender/code/RtpQueue.h
@@ -0,0 +1,59 @@
+#ifndef RTP_QUEUE
+#define RTP_QUEUE
+
+/*
+* Implements a simple RTP packet queue, one RTP queue
+* per stream {SSRC,PT}
+*/
+
+class RtpQueueIface {
+public:
+ virtual void clear() = 0;
+ virtual int sizeOfNextRtp() = 0;
+ virtual int seqNrOfNextRtp() = 0;
+ virtual int bytesInQueue() = 0; // Number of bytes in queue
+ virtual int sizeOfQueue() = 0; // Number of items in queue
+ virtual float getDelay(float currTs) = 0;
+ virtual int getSizeOfLastFrame() = 0;
+};
+
+class RtpQueueItem {
+public:
+ RtpQueueItem();
+ char packet[2000];
+ int size;
+ unsigned short seqNr;
+ float ts;
+ bool used;
+};
+
+const int kRtpQueueSize = 1024;
+class RtpQueue : public RtpQueueIface {
+public:
+ RtpQueue();
+
+ void push(void *rtpPacket, int size, unsigned short seqNr, float ts);
+ bool pop(void *rtpPacket, int &size, unsigned short &seqNr);
+ int sizeOfNextRtp();
+ int seqNrOfNextRtp();
+ int bytesInQueue(); // Number of bytes in queue
+ int sizeOfQueue(); // Number of items in queue
+ float getDelay(float currTs);
+ bool sendPacket(void *rtpPacket, int &size, unsigned short &seqNr);
+ void clear();
+ int getSizeOfLastFrame() {return sizeOfLastFrame;};
+ void setSizeOfLastFrame(int sz) {sizeOfLastFrame=sz;};
+ void computeSizeOfNextRtp();
+
+ RtpQueueItem *items[kRtpQueueSize];
+ int head; // Pointer to last inserted item
+ int tail; // Pointer to the oldest item
+ int nItems;
+ int sizeOfLastFrame;
+
+ int bytesInQueue_;
+ int sizeOfQueue_;
+ int sizeOfNextRtp_;
+};
+
+#endif
diff --git a/Laptop/scream/scream_sender/code/ScreamRx.h b/Laptop/scream/scream_sender/code/ScreamRx.h
new file mode 100644
index 0000000000000000000000000000000000000000..f1d9e83c05b476833e82d926ca13d187f9d4179c
--- /dev/null
+++ b/Laptop/scream/scream_sender/code/ScreamRx.h
@@ -0,0 +1,146 @@
+#ifndef SCREAM_RX
+#define SCREAM_RX
+#include <cstdint>
+#include <list>
+const int kAckVectorBits = 64;
+
+/*
+* This module implements the receiver side of SCReAM.
+* As SCReAM is a sender based congestion control, the receiver side is
+* actually dumber than dumb. In essense the only thing that it does is to
+* + Record receive time stamps and RTP sequence numbers for incoming RTP packets
+* + Generate RTCP feedback elements
+* + Calculate an appropriate RTCP feedback interval
+* See https://github.com/EricssonResearch/scream/blob/master/SCReAM-description.pdf
+* for details on how it is integrated in audio/video platforms.
+* A full implementation needs the additional code for
+* + RTCP feedback (e.g using RFC3611 XR elements)
+* + Other obvious stuff such as RTP payload depacketizer, video+audio deoders, rendering, dejitterbuffers
+* It is recommended that RTCP feedback for multiple streams are bundled in one RTCP packet.
+* However as low bitrate media (e.g audio) requires a lower feedback rate than high bitrate media (e.g video)
+* it is possible to include RTCP feedback for the audio stream more seldom. The code for this is T.B.D
+*/
+class ScreamRx {
+public:
+ ScreamRx(uint32_t ssrc); // SSRC of this RTCP session
+ /*
+ * One instance is created for each source SSRC
+ */
+ class Stream {
+ public:
+ Stream(uint32_t ssrc);
+
+ bool isMatch(uint32_t ssrc_) { return ssrc == ssrc_; };
+
+ bool checkIfFlushAck();
+ /*
+ * Receive RTP packet
+ */
+ void receive(uint64_t time_us,
+ void *rtpPacket,
+ int size,
+ uint16_t seqNr,
+ bool isEcnCe);
+
+ uint32_t ssrc; // SSRC of stream (source SSRC)
+ uint16_t highestSeqNr; // Highest received sequence number
+ uint16_t highestSeqNrTx; // Highest fed back sequence number
+ uint32_t receiveTimestamp; // Wall clock time
+ uint64_t ackVector; // List of received packets
+ uint16_t ecnCeMarkedBytes; // Number of ECN-CE marked bytes
+ // (i.e size of RTP packets with CE set in IP header)
+
+ uint64_t lastFeedbackT_us; // Last time feedback transmitted for
+ // this SSRC
+ int nRtpSinceLastRtcp; // Number of RTP packets since last transmitted RTCP
+
+ bool firstReceived;
+
+ float timeStampConversionFactor;
+
+ int ix;
+ };
+
+ /*
+ * Check to ensure that ACK vector can cover also large holes in
+ * in the received sequence number space. These cases can frequently occur when
+ * SCReAM is used in frame discard mode i.e. when real video rate control is
+ * not possible
+ */
+ bool checkIfFlushAck();
+
+ /*
+ * Function is called each time an RTP packet is received
+ */
+ void receive(uint64_t time_us,
+ void* rtpPacket,
+ uint32_t ssrc,
+ int size,
+ uint16_t seqNr,
+ bool isEcnCe = false);
+
+ /*
+ * Return TRUE if an RTP packet has been received and there is
+ * pending feedback
+ */
+ bool isFeedback(uint64_t time_us);
+
+ uint64_t getRtcpFbInterval();
+
+ /*
+ * Get SCReAM RTCP feedback elements
+ * return FALSE if no pending feedback available
+ */
+ bool getFeedback(uint64_t time_us,
+ uint32_t &ssrc,
+ uint32_t &receiveTimestamp,
+ uint16_t &highestSeqNr,
+ uint64_t &ackVector,
+ uint16_t &ecnCeMarkedBytes);
+
+ /*
+ * Create feedback according to the format below. It is up to the
+ * wrapper application to prepend this RTCP with SR or RR when needed
+ * BT = 255, means that this is experimental use
+ *
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |V=2|P|reserved | PT=XR=207 | length=6 |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | SSRC |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | BT=255 | reserved | block length=4 |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | SSRC of source |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Highest recv. seq. nr. (16b) | ECN_CE_bytes |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Ack vector (b0-31) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Ack vector (b32-63) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Timestamp (32bits) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+ bool createFeedback(uint64_t time_us, unsigned char *buf, int &size);
+
+ uint64_t getLastFeedbackT() { return lastFeedbackT_us; };
+
+ uint64_t lastFeedbackT_us;
+ int bytesReceived;
+ uint64_t lastRateComputeT_us;
+ float averageReceivedRate;
+ uint64_t rtcpFbInterval_us;
+ uint32_t ssrc;
+
+ int getIx(uint32_t ssrc);
+ int ix;
+
+ /*
+ * Variables for multiple steams handling
+ */
+ std::list<Stream*> streams;
+};
+
+#endif
diff --git a/Laptop/scream/scream_sender/code/ScreamTx.cpp b/Laptop/scream/scream_sender/code/ScreamTx.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..d638130f0759a6990b2eb878c30669632afc7d12
--- /dev/null
+++ b/Laptop/scream/scream_sender/code/ScreamTx.cpp
@@ -0,0 +1,1912 @@
+#include "RtpQueue.h"
+#include "ScreamTx.h"
+#include "ScreamRx.h"
+#ifdef _MSC_VER
+#define NOMINMAX
+#include <winSock2.h>
+#else
+#include <arpa/inet.h>
+#endif
+#include <cstdint>
+#include <cmath>
+#include <string.h>
+#include <iostream>
+#include <algorithm>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+// === Some good to have features, SCReAM works also
+// with these disabled
+// Fast start can resume if little or no congestion detected
+static const bool kEnableConsecutiveFastStart = true;
+// Packet pacing reduces jitter
+static const bool kEnablePacketPacing = true;
+static const float kPacketPacingHeadRoom = 1.5f;
+
+// Rate update interval
+static const uint64_t kRateAdjustInterval_us = 200000; // 200ms
+
+// ==== Less important tuning parameters ====
+// Min pacing interval and min pacing rate
+static const float kMinPaceInterval = 0.000f;
+static const float kMinimumBandwidth = 5000.0f; // bps
+// Initial MSS, this is set quite low in order to make it possible to
+// use SCReAM with audio only
+static const int kInitMss = 100;
+
+// Min and max queue delay target
+static const float kQueueDelayTargetMax = 0.3f; //ms
+
+// Congestion window validation
+static const float kBytesInFlightHistInterval_us = 1000000; // Time (s) between stores 1s
+static const float kMaxBytesInFlightHeadRoom = 1.1f;
+// Queue delay trend and shared bottleneck detection
+static const uint64_t kQueueDelayFractionHistInterval_us = 50000; // 50ms
+// video rate estimation update period
+static const uint64_t kRateUpdateInterval_us = 50000; // 50ms
+
+// Packet reordering margin (us)
+static const uint64_t kReorderTime_us = 20000;
+static const uint64_t kMinRtpQueueDiscardInterval_us = 1000000;
+
+// Update interval for base delay history
+static const uint64_t kBaseDelayUpdateInterval_us = 10000000;
+
+// L4S alpha gain factor, for scalable congestion control
+static const float kL4sG = 0.125f;
+
+// Min CWND in MSS
+static int kMinCwndMss = 3;
+
+ScreamTx::ScreamTx(float lossBeta_,
+ float ecnCeBeta_,
+ float queueDelayTargetMin_,
+ bool enableSbd_,
+ float gainUp_,
+ float gainDown_,
+ int cwnd_,
+ float cautiousPacing_,
+ int bytesInFlightHistSize_,
+ bool isL4s_,
+ bool openWindow_
+ ) :
+ sRttSh_us(0),
+ lossBeta(lossBeta_),
+ ecnCeBeta(ecnCeBeta_),
+ queueDelayTargetMin(queueDelayTargetMin_),
+ enableSbd(enableSbd_),
+ gainUp(gainUp_),
+ gainDown(gainDown_),
+ cautiousPacing(cautiousPacing_),
+ bytesInFlightHistSize(bytesInFlightHistSize_),
+ openWindow(openWindow_),
+ isL4s(isL4s_),
+ sRtt_us(0),
+ sRtt(0.0f),
+ ackedOwd(0),
+ baseOwd(UINT32_MAX),
+ queueDelay(0.0),
+ queueDelayFractionAvg(0.0),
+ queueDelayTrend(0.0),
+ queueDelayTarget(queueDelayTargetMin),
+ queueDelaySbdVar(0.0),
+ queueDelaySbdMean(0.0),
+ queueDelaySbdMeanSh(0.0),
+
+ bytesNewlyAcked(0),
+ mss(kInitMss),
+ cwnd(kInitMss * 2),
+ cwndMin(kInitMss * 2),
+ lastBytesInFlightT_us(0),
+ bytesInFlightMaxLo(0),
+ bytesInFlightMaxHi(0),
+ bytesInFlightHistLoMem(0),
+ bytesInFlightHistHiMem(0),
+ maxBytesInFlight(0.0f),
+
+ lossEvent(false),
+ wasLossEvent(false),
+ lossEventRate(0.0),
+ ecnCeEvent(false),
+ l4sAlpha(0.1f),
+ bytesMarkedThisRtt(0),
+ bytesDeliveredThisRtt(0),
+ lastL4sAlphaUpdateT_us(0),
+ inFastStart(true),
+
+ paceInterval_us(0),
+ paceInterval(0.0),
+ rateTransmittedAvg(0.0),
+
+ isInitialized(false),
+ lastSRttUpdateT_us(0),
+ lastBaseOwdAddT_us(0),
+ baseOwdResetT_us(0),
+ lastAddToQueueDelayFractionHistT_us(0),
+ lastLossEventT_us(0),
+ lastTransmitT_us(0),
+ nextTransmitT_us(0),
+ lastRateUpdateT_us(0),
+ accBytesInFlightMax(0),
+ nAccBytesInFlightMax(0),
+ rateTransmitted(0.0f),
+ rateAcked(0.0f),
+ queueDelayTrendMem(0.0f),
+ lastCwndUpdateT_us(0),
+ bytesInFlight(0),
+ bytesInFlightLog(0),
+ lastBaseDelayRefreshT_us(0),
+ maxRate(0.0f),
+ baseOwdHistMin(UINT32_MAX)
+{
+ if (cwnd_ == 0) {
+ cwnd = kInitMss * 2;
+ }
+ else {
+ cwnd = cwnd_;
+ }
+ if (openWindow) {
+ cwndMin = 10000000;
+ cwnd = cwndMin;
+ }
+
+ for (int n = 0; n < kBaseOwdHistSize; n++)
+ baseOwdHist[n] = UINT32_MAX;
+ baseOwdHistPtr = 0;
+ for (int n = 0; n < kQueueDelayFractionHistSize; n++)
+ queueDelayFractionHist[n] = 0.0f;
+ queueDelayFractionHistPtr = 0;
+ for (int n = 0; n < kQueueDelayNormHistSize; n++)
+ queueDelayNormHist[n] = 0.0f;
+ queueDelayNormHistPtr = 0;
+ for (int n = 0; n < kBytesInFlightHistSizeMax; n++) {
+ bytesInFlightHistLo[n] = 0;
+ bytesInFlightHistHi[n] = 0;
+ }
+ bytesInFlightHistPtr = 0;
+ nStreams = 0;
+ for (int n = 0; n < kMaxStreams; n++)
+ streams[n] = NULL;
+
+ queueDelayMax = 0.0f;
+ queueDelayMinAvg = 0.0f;
+ queueDelayMin = 1000.0;
+
+ statistics = new Statistics();
+}
+
+ScreamTx::~ScreamTx() {
+ for (int n = 0; n < nStreams; n++)
+ delete streams[n];
+ delete statistics;
+}
+
+ScreamTx::Statistics::Statistics() {
+ sumRateTx = 0.0f;
+ sumRateLost = 0.0f;
+ avgRateTx = 0.0f;
+ avgRtt = 0.0f;
+ avgQueueDelay = 0.0f;
+ rateLostAcc = 0.0f;
+ rateLostN = 0;
+ for (int n = 0; n < kLossRateHistSize; n++) {
+ lossRateHist[n] = 0.0f;
+ }
+ lossRateHistPtr = 0;
+}
+
+void ScreamTx::Statistics::add(float rateTx, float rateLost, float rtt, float queueDelay) {
+ const float alpha = 0.98f;
+ sumRateTx += rateTx;
+ sumRateLost += rateLost;
+ if (avgRateTx == 0.0f) {
+ avgRateTx = rateTx;
+ avgRtt = rtt;
+ avgQueueDelay = queueDelay;
+ }
+ else {
+ avgRateTx = alpha*avgRateTx + (1.0f - alpha)*rateTx;
+ rateLostAcc += rateLost;
+ rateLostN++;
+ if (rateLostN == 10) {
+ rateLostAcc /= 10;
+ rateLostN = 0;
+ float lossRate = 0.0f;
+ if (rateTx > 0)
+ lossRate = rateLostAcc / rateTx*100.0f;
+ lossRateHist[lossRateHistPtr] = lossRate;
+ lossRateHistPtr = (lossRateHistPtr + 1) % kLossRateHistSize;
+ }
+ avgRtt = alpha*avgRtt + (1.0f - alpha)*rtt;
+ avgQueueDelay = alpha*avgQueueDelay + (1.0f - alpha)*queueDelay;
+ }
+}
+
+void ScreamTx::Statistics::getSummary(float time, char s[]) {
+ float lossRate = 0.0f;
+ for (int n = 0; n < kLossRateHistSize; n++)
+ lossRate += lossRateHist[n];
+ lossRate /= kLossRateHistSize;
+ float lossRateLong = 0.0f;
+ if (sumRateTx > 100000.0f) {
+ lossRateLong = sumRateLost / sumRateTx*100.0f;
+ }
+ sprintf(s, "%5.1f Transmit rate = %5.0fkbps, PLR = %5.2f%%(%5.2f%%), RTT = %5.3fs, Queue delay = %5.3fs",
+ time,
+ avgRateTx / 1000.0f,
+ lossRate,
+ lossRateLong,
+ avgRtt,
+ avgQueueDelay);
+}
+
+/*
+* Register new stream
+*/
+void ScreamTx::registerNewStream(RtpQueueIface *rtpQueue,
+ uint32_t ssrc,
+ float priority,
+ float minBitrate,
+ float startBitrate,
+ float maxBitrate,
+ float rampUpSpeed,
+ float maxRtpQueueDelay,
+ float txQueueSizeFactor,
+ float queueDelayGuard,
+ float lossEventRateScale,
+ float ecnCeEventRateScale) {
+ Stream *stream = new Stream(this,
+ rtpQueue,
+ ssrc,
+ priority,
+ minBitrate,
+ startBitrate,
+ maxBitrate,
+ rampUpSpeed,
+ maxRtpQueueDelay,
+ txQueueSizeFactor,
+ queueDelayGuard,
+ lossEventRateScale,
+ ecnCeEventRateScale);
+ streams[nStreams++] = stream;
+}
+
+void ScreamTx::updateBitrateStream(uint32_t ssrc,
+ float minBitrate,
+ float maxBitrate) {
+ Stream *stream = getStream(ssrc);
+ stream->minBitrate = minBitrate;
+ stream->maxBitrate = maxBitrate;
+}
+
+RtpQueueIface * ScreamTx::getStreamQueue(uint32_t ssrc) {
+ Stream* stream = getStream(ssrc);
+ return stream->rtpQueue;
+}
+
+
+/*
+* New media frame
+*/
+void ScreamTx::newMediaFrame(uint64_t time_us, uint32_t ssrc, int bytesRtp) {
+ if (!isInitialized) initialize(time_us);
+
+ Stream *stream = getStream(ssrc);
+ stream->updateTargetBitrate(time_us);
+ if (time_us - lastCwndUpdateT_us < 500000) {
+ /*
+ * We expect feedback at least every 500ms
+ * to update the target rate.
+ */
+ stream->updateTargetBitrate(time_us);
+ }
+ if (time_us - lastBaseDelayRefreshT_us < sRtt_us * 2) {
+ /*
+ * _Very_ long periods of congestion can cause the base delay to increase
+ * with the effect that the queue delay is estimated wrong, therefore we seek to
+ * refresh the whole thing by deliberately allowing the network queue to drain
+ * Clear the RTP queue for 2 RTTs, this will allow the queue to drain so that we
+ * get a good estimate for the min queue delay.
+ * This funtion is executed very seldom so it should not affect overall experience too much
+ */
+ stream->rtpQueue->clear();
+ }
+ else {
+ stream->bytesRtp += bytesRtp;
+ /*
+ * Need to update MSS here, otherwise it will be nearly impossible to
+ * transmit video packets, this because of the small initial MSS
+ * which is necessary to make SCReAM work with audio only
+ */
+ int sizeOfNextRtp = stream->rtpQueue->sizeOfNextRtp();
+ mss = std::max(mss, sizeOfNextRtp);
+ if (!openWindow)
+ cwndMin = 2 * mss;
+ cwnd = max(cwnd, cwndMin);
+ }
+}
+
+/*
+* Determine if OK to transmit RTP packet
+*/
+float ScreamTx::isOkToTransmit(uint64_t time_us, uint32_t &ssrc) {
+ if (!isInitialized) initialize(time_us);
+ /*
+ * Update rateTransmitted and rateAcked if time for it
+ * This is used in video rate computation
+ * The update interval is doubled at very low bitrates,
+ * the reason is that the feedback interval is very low then and
+ * a longer window is needed to avoid aliasing effects
+ */
+ uint64_t tmp = kRateUpdateInterval_us;
+
+ if (rateAcked < 50000.0f) {
+ tmp *= 2;
+ }
+
+ if (time_us - lastRateUpdateT_us > tmp) {
+ rateTransmitted = 0.0;
+ rateAcked = 0.0;
+ for (int n = 0; n < nStreams; n++) {
+ streams[n]->updateRate(time_us);
+ rateTransmitted += streams[n]->rateTransmitted;
+ rateTransmittedAvg = 0.9*rateTransmittedAvg + 0.1*rateTransmitted;
+ rateAcked += streams[n]->rateAcked;
+ if (n == 0)
+ statistics->add(streams[0]->rateTransmitted, streams[0]->rateLost, sRtt, queueDelay);
+ }
+ lastRateUpdateT_us = time_us;
+ /*
+ * Adjust stream priorities
+ */
+ adjustPriorities(time_us);
+
+ /*
+ * Update maxRate
+ */
+ maxRate = 0.0f;
+ for (int n = 0; n < nStreams; n++)
+ maxRate += streams[n]->getMaxRate();
+ }
+
+ /*
+ * Get index to the prioritized RTP queue
+ */
+ Stream* stream = getPrioritizedStream(time_us);
+
+ if (stream == NULL)
+ /*
+ * No RTP packets to transmit
+ */
+ return -1.0f;
+ ssrc = stream->ssrc;
+
+ bytesInFlightMaxHi = std::max(bytesInFlight, bytesInFlightMaxHi);
+
+ /*
+ * Update bytes in flight history for congestion window validation
+ */
+ if (time_us - lastBytesInFlightT_us > kBytesInFlightHistInterval_us) {
+ bytesInFlightMaxLo = 0;
+ if (nAccBytesInFlightMax > 0) {
+ bytesInFlightMaxLo = accBytesInFlightMax / nAccBytesInFlightMax;
+ }
+ bytesInFlightHistLo[bytesInFlightHistPtr] = bytesInFlightMaxLo;
+ bytesInFlightHistHi[bytesInFlightHistPtr] = bytesInFlightMaxHi;
+ bytesInFlightHistPtr = (bytesInFlightHistPtr + 1) % bytesInFlightHistSize;
+ lastBytesInFlightT_us = time_us;
+ accBytesInFlightMax = 0;
+ nAccBytesInFlightMax = 0;
+ bytesInFlightMaxHi = 0;
+ bytesInFlightHistLoMem = 0;
+ bytesInFlightHistHiMem = 0;
+ for (int n = 0; n < bytesInFlightHistSize; n++) {
+ bytesInFlightHistLoMem = std::max(bytesInFlightHistLoMem, bytesInFlightHistLo[n]);
+ bytesInFlightHistHiMem = std::max(bytesInFlightHistHiMem, bytesInFlightHistHi[n]);
+ }
+
+ /*
+ * In addition, reset MSS, this is useful in case for instance
+ * a video stream is put on hold, leaving only audio packets to be
+ * transmitted
+ */
+ mss = kInitMss;
+ if (!openWindow)
+ cwndMin = kMinCwndMss * mss;
+ cwnd = max(cwnd, cwndMin);
+ }
+
+ int sizeOfNextRtp = stream->rtpQueue->sizeOfNextRtp();
+ if (sizeOfNextRtp == -1){
+ return -1.0f;
+ }
+ /*
+ * Determine if window is large enough to transmit
+ * an RTP packet
+ */
+ bool exit = false;
+ if (queueDelay < queueDelayTarget)
+ exit = (bytesInFlight + sizeOfNextRtp) > cwnd + mss;
+ else
+ exit = (bytesInFlight + sizeOfNextRtp) > cwnd;
+ /*
+ * Enforce packet pacing
+ */
+ float retVal = 0.0f;
+ if (kEnablePacketPacing && nextTransmitT_us > time_us){
+ retVal = (nextTransmitT_us - time_us) * 1e-6f;
+ }
+
+ /*
+ * A retransmission time out mechanism to avoid deadlock
+ */
+ if (time_us - lastTransmitT_us > 500000 && lastTransmitT_us < time_us) { // 200ms
+ for (int n = 0; n < kMaxTxPackets; n++) {
+ stream->txPackets[n].isUsed = false;
+ }
+ bytesInFlight = 0;
+ exit = false;
+ retVal = 0.0f;
+ }
+
+ if (!exit) {
+ /*
+ * Return value 0.0 = RTP packet can be immediately transmitted
+ */
+ return retVal;
+ }
+
+ return -1.0f;
+}
+
+/*
+* RTP packet transmitted
+*/
+float ScreamTx::addTransmitted(uint64_t time_us,
+ uint32_t ssrc,
+ int size,
+ uint16_t seqNr) {
+ if (!isInitialized)
+ initialize(time_us);
+
+ Stream *stream = getStream(ssrc);
+
+ int ix = seqNr % kMaxTxPackets;
+ Transmitted *txPacket = &(stream->txPackets[ix]);
+ if (txPacket->isUsed) {
+ /*
+ * This event should occur quite rarely.
+ * The most likely reason is that thoughput has dropped
+ * considerably.
+ * Therefore we clean the list and set cwnd and bitrate low
+ */
+ for (int n = 0; n < kMaxTxPackets; n++) {
+ stream->txPackets[n].isUsed = false;
+ }
+ bytesInFlight = 0;//-= txPacket->size;
+ cwnd = cwndMin;
+ stream->targetBitrate = stream->minBitrate;
+ }
+ stream->hiSeqTx = seqNr;
+ txPacket->timestamp = (uint32_t)(time_us / 1000);
+ txPacket->timeTx_us = time_us;
+ txPacket->size = size;
+ txPacket->seqNr = seqNr;
+ txPacket->isUsed = true;
+ txPacket->isAcked = false;
+ txPacket->isAfterReceivedEdge = false;
+
+ /*
+ * Update bytesInFlight
+ */
+ bytesInFlight += size;
+ bytesInFlightLog = std::max(bytesInFlightLog, bytesInFlight);
+
+ stream->bytesTransmitted += size;
+ lastTransmitT_us = time_us;
+ /*
+ * Add credit to unserved streams
+ */
+ addCredit(time_us, stream, size);
+ /*
+ * Reduce used credit for served stream
+ */
+ subtractCredit(time_us, stream, size);
+
+ /*
+ * Update MSS and cwndMin
+ */
+ mss = std::max(mss, size);
+ if (!openWindow)
+ cwndMin = 2 * mss;
+ cwnd = max(cwnd, cwndMin);
+
+ /*
+ * Determine when next RTP packet can be transmitted
+ */
+ if (kEnablePacketPacing)
+ nextTransmitT_us = time_us + paceInterval_us;
+ else
+ nextTransmitT_us = time_us;
+
+ return paceInterval;
+}
+
+/*
+* Parse feedback according to the format below. It is up to the
+* wrapper application this RTCP from a compound RTCP if needed
+* BT = 255, means that this is experimental use.
+* The code currently only handles one SSRC source per IP packet
+*
+* 0 1 2 3
+* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* |V=2|P|reserved | PT=XR=207 | length=6 |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | SSRC |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | BT=255 | reserved | block length=4 |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | SSRC of source |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | Highest recv. seq. nr. (16b) | ECN_CE_bytes |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | Ack vector (b0-31) |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | Ack vector (b32-63) |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+* | Timestamp (32bits) |
+* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*/
+void ScreamTx::incomingFeedback(uint64_t time_us,
+ unsigned char* buf,
+ int size) {
+ if (!(size == 32 && buf[0] == 0x80 && buf[1] == 207 && buf[8] == 255)) {
+ // This does not seem as a valid size, exit function
+ return;
+ }
+ uint32_t tmp_l_1;
+ uint16_t tmp_s;
+ uint32_t tmp_l_2;
+ uint32_t timeStamp;
+ uint16_t seqNr;
+ uint64_t ackVector;
+ uint16_t ecnCeMarkedBytes;
+ uint32_t ssrc;
+ uint16_t rawSeq;
+ memcpy(&tmp_l_1, buf + 12, 4);
+ ssrc = ntohl(tmp_l_1);
+ memcpy(&seqNr, buf + 16, 2);
+ seqNr = ntohs(seqNr);
+ memcpy(&ecnCeMarkedBytes, buf + 18, 2);
+ ecnCeMarkedBytes = ntohs(ecnCeMarkedBytes);
+ memcpy(&tmp_l_1, buf + 20, 4);
+ memcpy(&tmp_l_2, buf + 24, 4);
+ tmp_l_1 = ntohl(tmp_l_1);
+ tmp_l_2 = ntohl(tmp_l_2);
+ ackVector = ((uint64_t(tmp_l_1)) << 32) | tmp_l_2;
+ memcpy(&timeStamp, buf + 28, 4);
+ timeStamp = ntohl(timeStamp);
+ incomingFeedback(time_us, ssrc, timeStamp, seqNr, ackVector, ecnCeMarkedBytes);
+}
+/*
+* New incoming feedback
+*/
+void ScreamTx::incomingFeedback(uint64_t time_us,
+ uint32_t ssrc,
+ uint32_t timestamp,
+ uint16_t highestSeqNr,
+ uint64_t ackVector,
+ uint16_t ecnCeMarkedBytes) {
+
+ if (!isInitialized) initialize(time_us);
+ Stream *stream = getStream(ssrc);
+ if (stream == 0) {
+ // Bogus RTCP?, the SSRC is wrong anyway, Skip
+ return;
+ }
+
+ uint16_t diff = highestSeqNr - stream->hiSeqAck;
+ if (diff > 65000 && stream->hiSeqAck != 0 && stream->timeTxAck_us != 0) {
+ /*
+ * Out of order received ACKs are ignored
+ */
+ return;
+ }
+ accBytesInFlightMax += bytesInFlight;
+ nAccBytesInFlightMax++;
+ Transmitted *txPackets = stream->txPackets;
+ /*
+ * Mark received packets, given by the ACK vector
+ */
+ markAcked(time_us, txPackets, highestSeqNr, ackVector, timestamp, stream);
+
+ /*
+ * Detect lost pakcets
+ */
+ detectLoss(time_us, txPackets, highestSeqNr, stream);
+
+ if (ecnCeMarkedBytes != stream->ecnCeMarkedBytes && time_us - lastLossEventT_us > sRtt_us) {
+ ecnCeEvent = true;
+ lastLossEventT_us = time_us;
+ }
+
+ if (isL4s) {
+ /*
+ * L4S mode compute a congestion scaling factor that is dependent on the fraction
+ * of ECN marked packets
+ */
+ uint16_t marked = ecnCeMarkedBytes - stream->ecnCeMarkedBytes;
+ bytesMarkedThisRtt += marked;
+ bytesDeliveredThisRtt += bytesNewlyAcked;
+ if (lastL4sAlphaUpdateT_us - time_us > sRtt_us) {
+ lastL4sAlphaUpdateT_us = time_us;
+ if (bytesDeliveredThisRtt > 0) {
+ float F = float(bytesMarkedThisRtt) / float(bytesDeliveredThisRtt);
+ l4sAlpha = kL4sG*F + (1.0f - kL4sG)*l4sAlpha;
+ bytesDeliveredThisRtt = 0;
+ bytesMarkedThisRtt = 0;
+ }
+ }
+ }
+
+ stream->ecnCeMarkedBytes = ecnCeMarkedBytes;
+
+ if (lossEvent || ecnCeEvent) {
+ lastLossEventT_us = time_us;
+ for (int n = 0; n < nStreams; n++) {
+ Stream *tmp = streams[n];
+ if (lossEvent)
+ tmp->lossEventFlag = true;
+ else
+ tmp->ecnCeEventFlag = true;
+ }
+ }
+
+ if (lastCwndUpdateT_us == 0)
+ lastCwndUpdateT_us = time_us;
+
+ if (time_us - lastCwndUpdateT_us > 10000) {
+ /*
+ * There is no gain with a too frequent CWND update
+ * An update every 10ms is fast enough even at very high high bitrates
+ */
+ updateCwnd(time_us);
+ lastCwndUpdateT_us = time_us;
+ }
+}
+
+/*
+* Mark ACKed RTP packets
+*/
+void ScreamTx::markAcked(uint64_t time_us, struct Transmitted *txPackets, uint16_t highestSeqNr, uint64_t ackVector, uint32_t timestamp, Stream *stream) {
+ /*
+ * Loop only through the packets that are covered by the last highest ACK, this saves complexity
+ */
+ int ix1 = highestSeqNr; ix1 = ix1 % kMaxTxPackets;
+ int ix0 = stream->hiSeqAck + 1;
+ if (ix0 < 0) ix0 += kMaxTxPackets;
+ while (ix1 < ix0)
+ ix1 += kMaxTxPackets;
+ for (int m = ix0; m <= ix1; m++) {
+ int n = m % kMaxTxPackets;
+ /*
+ * Loop through TX packets
+ */
+ if (txPackets[n].isUsed) {
+ /*
+ * RTP packet is in flight
+ */
+ Transmitted *tmp = &txPackets[n];
+
+ /*
+ * Compute SN difference
+ */
+ uint16_t diff = highestSeqNr - tmp->seqNr;
+ diff -= 1;
+
+ if (diff <= kAckVectorBits) {
+ if (ackVector & (INT64_C(1) << diff)) {
+ /*
+ * SN marked as received
+ */
+ tmp->isAcked = true;
+ }
+ }
+
+ /*
+ * Receiption of packet given by highestSeqNr
+ */
+ if (tmp->seqNr == highestSeqNr) {
+ tmp->isAcked = true;
+ ackedOwd = timestamp - tmp->timestamp;
+ /*
+ * Compute the queue delay
+ */
+ uint32_t qDel = estimateOwd(time_us);
+ qDel -= getBaseOwd();
+
+ /*
+ * Convert from [jiffy] OWD to an OWD in [s]
+ */
+ queueDelay = qDel / kTimestampRate;
+
+ uint64_t rtt = time_us - tmp->timeTx_us;
+
+ sRttSh_us = (7 * sRttSh_us + rtt) / 8;
+ if (time_us - lastSRttUpdateT_us > sRttSh_us) {
+ sRtt_us = (7 * sRtt_us + sRttSh_us) / 8;
+ lastSRttUpdateT_us = time_us;
+ sRtt = sRtt_us*1e-6f;
+ }
+ stream->timeTxAck_us = tmp->timeTx_us;
+ }
+ }
+ }
+}
+
+/*
+* Detect lost RTP packets
+*/
+void ScreamTx::detectLoss(uint64_t time_us, struct Transmitted *txPackets, uint16_t highestSeqNr, Stream *stream) {
+ /*
+ * Loop only through the packets that are covered by the last highest ACK, this saves complexity
+ * There is a faint possibility that we miss to detect large bursts of lost packets with this fix
+ */
+ int ix1 = highestSeqNr; ix1 = ix1 % kMaxTxPackets;
+ int ix0 = stream->hiSeqAck + 1;
+ stream->hiSeqAck = highestSeqNr;
+ if (ix0 < 0) ix0 += kMaxTxPackets;
+ while (ix1 < ix0)
+ ix1 += kMaxTxPackets;
+
+ /*
+ * Mark packets outside the 64 bit ACK vector range as forever lost
+ */
+ if (stream->lastLossDetectIx >= 0) {
+ int ix0_ = ix0;
+ if (stream->lastLossDetectIx > ix0_) ix0_ += kMaxTxPackets;
+ for (int m = stream->lastLossDetectIx; m < ix0_; m++) {
+ int n = m % kMaxTxPackets;
+ if (txPackets[n].isUsed) {
+ Transmitted *tmp = &txPackets[n];
+ if (time_us - lastLossEventT_us > sRtt_us && lossBeta < 1.0f) {
+ lossEvent = true;
+ }
+ stream->bytesLost += tmp->size;
+ tmp->isUsed = false;
+ stream->repairLoss = true;
+ }
+ }
+ }
+ stream->lastLossDetectIx = ix0;
+
+ /*
+ * Mark late packets as lost
+ */
+ for (int m = ix0; m <= ix1; m++) {
+ int n = m % kMaxTxPackets;
+ /*
+ * Loop through TX packets
+ */
+ if (txPackets[n].isUsed) {
+ Transmitted *tmp = &txPackets[n];
+ /*
+ * RTP packet is in flight
+ */
+ /*
+ * Wrap-around safety net
+ */
+ uint32_t seqNrExt = tmp->seqNr;
+ uint32_t highestSeqNrExt = highestSeqNr;
+ if (seqNrExt < highestSeqNrExt && highestSeqNrExt - seqNrExt > 20000)
+ seqNrExt += 65536;
+ else if (seqNrExt > highestSeqNrExt && seqNrExt - highestSeqNrExt > 20000)
+ highestSeqNrExt += 65536;
+
+ /*
+ * RTP packets with a sequence number lower
+ * than or equal to the highest received sequence number
+ * are treated as received even though they are not
+ * This advances the send window, similar to what
+ * SACK does in TCP
+ */
+ if (seqNrExt <= highestSeqNrExt && tmp->isAfterReceivedEdge == false) {
+ bytesNewlyAcked += tmp->size;
+ bytesInFlight -= tmp->size;
+ if (bytesInFlight < 0)
+ bytesInFlight = 0;
+ stream->bytesAcked += tmp->size;
+ tmp->isAfterReceivedEdge = true;
+ }
+
+ if (tmp->timeTx_us + kReorderTime_us < stream->timeTxAck_us && !tmp->isAcked) {
+ /*
+ * Packet ACK is delayed more than kReorderTime_us after an ACK of a higher SN packet
+ * raise a loss event and remove from TX list
+ */
+ if (time_us - lastLossEventT_us > sRtt_us && lossBeta < 1.0f) {
+ lossEvent = true;
+ }
+ stream->bytesLost += tmp->size;
+ tmp->isUsed = false;
+ stream->repairLoss = true;
+ }
+ else if (tmp->isAcked) {
+ tmp->isUsed = false;
+ }
+ }
+ }
+
+}
+
+float ScreamTx::getTargetBitrate(uint32_t ssrc) {
+ return getStream(ssrc)->getTargetBitrate();
+}
+
+void ScreamTx::setTargetPriority(uint32_t ssrc, float priority) {
+ Stream *stream = getStream(ssrc);
+ if (queueDelayTrend > 0.02) {
+ stream->targetBitrate *= priority / stream->targetPriority;
+ stream->targetBitrate = std::min(std::max(stream->targetBitrate, stream->minBitrate), stream->maxBitrate);
+ }
+ stream->targetPriority = priority;
+ stream->targetPriorityInv = 1.0f / priority;
+}
+
+void ScreamTx::getLog(float time, char *s) {
+ int inFlightMax = std::max(bytesInFlight, bytesInFlightHistHiMem);
+ sprintf(s, "%4.3f, %4.3f, %4.3f, %4.3f, %6d, %6d, %6.0f, %1d, ",
+ queueDelay, queueDelayMax, queueDelayMinAvg, sRtt,
+ cwnd, bytesInFlightLog, rateTransmitted / 1000.0f, isInFastStart());
+ bytesInFlightLog = bytesInFlight;
+ queueDelayMax = 0.0;
+ for (int n = 0; n < nStreams; n++) {
+ Stream *tmp = streams[n];
+ char s2[200];
+ sprintf(s2, "%4.3f, %6.0f, %6.0f, %6.0f, %6.0f, %5.0f, %5d, ",
+ std::max(0.0f, tmp->rtpQueue->getDelay(time)),
+ tmp->targetBitrate / 1000.0f, tmp->rateRtp / 1000.0f,
+ tmp->rateTransmitted / 1000.0f, tmp->rateAcked / 1000.0f,
+ tmp->rateLost / 1000.0f,
+ tmp->hiSeqAck);
+ strcat(s, s2);
+ }
+}
+
+void ScreamTx::getShortLog(float time, char *s) {
+ int inFlightMax = std::max(bytesInFlight, bytesInFlightHistHiMem);
+ sprintf(s, "%4.3f, %4.3f, %6d, %6d, %6.0f, ",
+ queueDelayMax, sRtt,
+ cwnd, bytesInFlightLog, rateTransmitted / 1000.0f);
+ bytesInFlightLog = bytesInFlight;
+ queueDelayMax = 0.0;
+ for (int n = 0; n < nStreams; n++) {
+ Stream *tmp = streams[n];
+ char s2[200];
+ sprintf(s2, "%4.3f, %6.0f, %6.0f, %6.0f, %5.0f, ",
+ std::max(0.0f, tmp->rtpQueue->getDelay(time)),
+ tmp->targetBitrate / 1000.0f, tmp->rateRtp / 1000.0f,
+ tmp->rateTransmitted / 1000.0f,
+ tmp->rateLost / 1000.0f);
+ strcat(s, s2);
+ }
+}
+
+void ScreamTx::getStatistics(float time, char *s) {
+ statistics->getSummary(time, s);
+}
+
+void ScreamTx::initialize(uint64_t time_us) {
+ isInitialized = true;
+ lastSRttUpdateT_us = time_us;
+ lastBaseOwdAddT_us = time_us;
+ baseOwdResetT_us = time_us;
+ lastAddToQueueDelayFractionHistT_us = time_us;
+ lastLossEventT_us = time_us;
+ lastTransmitT_us = time_us;
+ nextTransmitT_us = time_us;
+ lastRateUpdateT_us = time_us;
+ lastAdjustPrioritiesT_us = time_us;
+ lastRttT_us = time_us;
+ lastBaseDelayRefreshT_us = time_us + 1000000;
+ lastL4sAlphaUpdateT_us = time_us;
+ initTime_us = time_us;
+}
+
+/*
+* Update the congestion window
+*/
+void ScreamTx::updateCwnd(uint64_t time_us) {
+ float dT = 0.001;
+ if (lastCwndUpdateT_us == 0)
+ lastCwndUpdateT_us = time_us;
+ else
+ dT = (time_us - lastCwndUpdateT_us) * 1e-6f;
+
+ /*
+ * This adds a limit to how much the CWND can grow, it is particularly useful
+ * in case of short gliches in the transmission, in which a large chunk of data is delivered
+ * in a burst with the effect that the estimated queue delay is low because it typically depict the queue
+ * delay for the last non-delayed RTP packet. The rule is that the CWND cannot grow faster
+ * than the 1.25 times the average amount of bytes that transmitted in the given feedback interval
+ */
+ float bytesNewlyAckedLimited = bytesNewlyAcked;
+ if (maxRate > 1.0e5f)
+ bytesNewlyAckedLimited = std::min(bytesNewlyAckedLimited, 1.25f*maxRate*dT / 8.0f);
+ else
+ bytesNewlyAckedLimited = 2.0f*mss;
+
+ queueDelayMin = std::min(queueDelayMin, queueDelay);
+
+ queueDelayMax = std::max(queueDelayMax, queueDelay);
+
+ float time = time_us*1e-6;
+ if (queueDelayMinAvg > 0.25f*queueDelayTarget && time_us - baseOwdResetT_us > 20000000) {
+ /*
+ * The base OWD is likely wrong, for instance due to
+ * a channel change or clock drift, reset base OWD history
+ */
+ queueDelayMinAvg = 0.0f;
+ queueDelay = 0.0f;
+ for (int n = 0; n < kBaseOwdHistSize; n++)
+ baseOwdHist[n] = UINT32_MAX;
+ baseOwd = UINT32_MAX;
+ baseOwdHistMin = UINT32_MAX;
+ baseOwdResetT_us = time_us;
+ }
+ /*
+ * An averaged version of the queue delay fraction
+ * neceassary in order to make video rate control robust
+ * against jitter
+ */
+ queueDelayFractionAvg = 0.9f*queueDelayFractionAvg + 0.1f*getQueueDelayFraction();
+
+ /*
+ * Less frequent updates here
+ * + Compute pacing interval
+ * + Save to queue delay fraction history
+ * used in computeQueueDelayTrend()
+ * + Update queueDelayTarget
+ */
+ if ((time_us - lastAddToQueueDelayFractionHistT_us) >
+ kQueueDelayFractionHistInterval_us) {
+
+ /*
+ * compute paceInterval, we assume a min bw of 50kbps and a min tp of 1ms
+ * for stable operation
+ * this function implements the packet pacing
+ */
+ paceInterval = kMinPaceInterval;
+ if ((queueDelayFractionAvg > 0.02f || isL4s) && kEnablePacketPacing) {
+ /*
+ * The cautiousPacing parameter restricts transmission of large key frames when the parameter is set to a value closer to 1.0
+ */
+ float pacingBitrate = (1.0 - cautiousPacing)*cwnd * 8.0f / std::max(0.001f, sRtt) + cautiousPacing*rateTransmittedAvg;
+ pacingBitrate = kPacketPacingHeadRoom*std::max(kMinimumBandwidth, pacingBitrate);
+ float tp = (mss * 8.0f) / pacingBitrate;
+ paceInterval = std::max(kMinPaceInterval, tp);
+ }
+ paceInterval_us = (uint64_t)(paceInterval * 1000000);
+
+ if (queueDelayMin < queueDelayMinAvg)
+ queueDelayMinAvg = queueDelayMin;
+ else
+ queueDelayMinAvg = 0.001f*queueDelayMin + 0.999f*queueDelayMinAvg;
+ queueDelayMin = 1000.0f;
+ /*
+ * Need to duplicate insertion incase the feedback is sparse
+ */
+ int nIter = (int)(time_us - lastAddToQueueDelayFractionHistT_us) / kQueueDelayFractionHistInterval_us;
+ for (int n = 0; n < nIter; n++) {
+ queueDelayFractionHist[queueDelayFractionHistPtr] = getQueueDelayFraction();
+ queueDelayFractionHistPtr = (queueDelayFractionHistPtr + 1) % kQueueDelayFractionHistSize;
+ }
+
+ if (time_us - initTime_us > 2000000) {
+ /*
+ * Queue delay trend calculations are reliable after ~2s
+ */
+ computeQueueDelayTrend();
+ }
+
+ queueDelayTrendMem = std::max(queueDelayTrendMem*0.98f, queueDelayTrend);
+
+ /*
+ * Compute bytes in flight limitation
+ */
+ int maxBytesInFlightHi = (int)(std::max(bytesInFlightMaxHi, bytesInFlightHistHiMem));
+ int maxBytesInFlightLo = (int)(std::max(bytesInFlight, bytesInFlightHistLoMem));
+
+ float alpha = std::max(queueDelayTrend, cautiousPacing);
+ maxBytesInFlight =
+ (maxBytesInFlightHi*(1.0f - alpha) + maxBytesInFlightLo*alpha)*
+ kMaxBytesInFlightHeadRoom;
+ if (enableSbd) {
+ /*
+ * Shared bottleneck detection,
+ */
+ float queueDelayNorm = queueDelay / queueDelayTargetMin;
+ queueDelayNormHist[queueDelayNormHistPtr] = queueDelayNorm;
+ queueDelayNormHistPtr = (queueDelayNormHistPtr + 1) % kQueueDelayNormHistSize;
+ /*
+ * Compute shared bottleneck detection and update queue delay target
+ * if queue dela variance is sufficienctly low
+ */
+ computeSbd();
+ /*
+ * This function avoids the adjustment of queueDelayTarget when
+ * congestion occurs (indicated by high queueDelaydSbdVar and queueDelaySbdSkew)
+ */
+ float oh = queueDelayTargetMin*(queueDelaySbdMeanSh + sqrt(queueDelaySbdVar));
+ if (lossEventRate > 0.002 && queueDelaySbdMeanSh > 0.5 && queueDelaySbdVar < 0.2) {
+ queueDelayTarget = std::min(kQueueDelayTargetMax, oh*1.5f);
+ }
+ else {
+ if (queueDelaySbdVar < 0.2 && queueDelaySbdSkew < 0.05) {
+ queueDelayTarget = std::max(queueDelayTargetMin, std::min(kQueueDelayTargetMax, oh));
+ }
+ else {
+ if (oh < queueDelayTarget)
+ queueDelayTarget = std::max(queueDelayTargetMin, std::max(queueDelayTarget*0.99f, oh));
+ else
+ queueDelayTarget = std::max(queueDelayTargetMin, queueDelayTarget*0.999f);
+ }
+ }
+ }
+ lastAddToQueueDelayFractionHistT_us = time_us;
+ }
+ /*
+ * offTarget is a normalized deviation from the queue delay target
+ */
+ float offTarget = (queueDelayTarget - queueDelay) / float(queueDelayTarget);
+
+ if (lossEvent) {
+ /*
+ * loss event detected, decrease congestion window
+ */
+ cwnd = std::max(cwndMin, (int)(lossBeta*cwnd));
+ lossEvent = false;
+ lastCongestionDetectedT_us = time_us;
+
+ inFastStart = false;
+ wasLossEvent = true;
+ }
+ else if (ecnCeEvent) {
+ /*
+ * loss event detected, decrease congestion window
+ */
+ if (isL4s) {
+ cwnd = std::max(cwndMin, (int)((1.0f - l4sAlpha / 2.0f)*cwnd));
+ }
+ else {
+ cwnd = std::max(cwndMin, (int)(ecnCeBeta*cwnd));
+ }
+ ecnCeEvent = false;
+ lastCongestionDetectedT_us = time_us;
+
+ inFastStart = false;
+ wasLossEvent = true;
+ }
+ else {
+
+ if (time_us - lastRttT_us > sRtt_us) {
+ if (wasLossEvent)
+ lossEventRate = 0.99f*lossEventRate + 0.01f;
+ else
+ lossEventRate *= 0.99f;
+ wasLossEvent = false;
+ lastRttT_us = time_us;
+ }
+
+ if (inFastStart) {
+ /*
+ * In fast start
+ */
+ if (queueDelayTrend < 0.2) {
+ /*
+ * CWND is increased by the number of ACKed bytes if
+ * window is used to 1/1.5 = 67%
+ * We need to relax the rule a bit for the case that
+ * feedback may be sparse due to limited RTCP report interval
+ * In addition we put a limit for the cases where feedback becomes
+ * piled up (sometimes happens with e.g LTE)
+ */
+ float bytesInFlightMargin = 1.5f;
+ if (bytesInFlight*bytesInFlightMargin + bytesNewlyAcked > cwnd) {
+ cwnd += bytesNewlyAckedLimited;
+ }
+ }
+ else {
+ inFastStart = false;
+ }
+ }
+ else {
+ if (offTarget > 0.0f) {
+ /*
+ * queue delay below target, increase CWND if window
+ * is used to 1/1.2 = 83%
+ */
+ float bytesInFlightMargin = 1.2f;
+ if (bytesInFlight*bytesInFlightMargin + bytesNewlyAcked > cwnd) {
+ float increment = gainUp * offTarget * bytesNewlyAckedLimited * mss / cwnd;
+ cwnd += (int)(increment + 0.5f);
+ }
+ }
+ else {
+ /*
+ * Queue delay above target.
+ * Limit the CWND reduction to at most a quarter window
+ * this avoids unduly large reductions for the cases
+ * where data is queued up e.g because of retransmissions
+ * on lower protocol layers.
+ */
+ float delta = -(gainDown * offTarget * bytesNewlyAcked * mss / cwnd);
+ delta = std::min((int)delta, cwnd / 4);
+ cwnd -= (int)(delta);
+
+ /*
+ * Especially when running over low bitrate bottlenecks, it is
+ * beneficial to reduce the target bitrate a little, it limits
+ * possible RTP queue delay spikes when congestion window is reduced
+ */
+ float rateTotal = 0.0f;
+ for (int n = 0; n < nStreams; n++)
+ rateTotal += streams[n]->getMaxRate();
+ if (rateTotal < 1.0e5f) {
+ delta = delta / cwnd;
+ float rateAdjustFactor = (1.0f - delta);
+ for (int n = 0; n < nStreams; n++) {
+ Stream *tmp = streams[n];
+ tmp->targetBitrate = std::max(tmp->minBitrate,
+ std::min(tmp->maxBitrate,
+ tmp->targetBitrate*rateAdjustFactor));
+ }
+ }
+ lastCongestionDetectedT_us = time_us;
+
+ }
+ }
+ }
+ /*
+ * Congestion window validation, checks that the congestion window is
+ * not considerably higher than the actual number of bytes in flight
+ */
+ if (maxBytesInFlight > 5000) {
+ cwnd = std::min(cwnd, (int)maxBytesInFlight);
+ }
+
+ if (sRtt < 0.01f && queueDelayTrend < 0.1) {
+ int tmp = int(rateTransmitted*0.01f / 8);
+ tmp = std::max(tmp, (int)(maxBytesInFlight*1.5f));
+ cwnd = std::max(cwnd, tmp);
+ }
+ cwnd = std::max(cwndMin, cwnd);
+
+ /*
+ * Make possible to enter fast start if OWD has been low for a while
+ */
+ if (queueDelayTrend > 0.2) {
+ lastCongestionDetectedT_us = time_us;
+ }
+ else if (time_us - lastCongestionDetectedT_us > 5000000 &&
+ !inFastStart && kEnableConsecutiveFastStart) {
+ /*
+ * The queue delay trend has been low for more than 5.0s, resume fast start
+ */
+ inFastStart = true;
+ lastCongestionDetectedT_us = time_us;
+ }
+ bytesNewlyAcked = 0;
+}
+
+/*
+* Update base OWD (if needed) and return the
+* last estimated OWD (without offset compensation)
+*/
+uint32_t ScreamTx::estimateOwd(uint64_t time_us) {
+ baseOwd = std::min(baseOwd, ackedOwd);
+ if (time_us - lastBaseOwdAddT_us >= kBaseDelayUpdateInterval_us) {
+ baseOwdHist[baseOwdHistPtr] = baseOwd;
+ baseOwdHistPtr = (baseOwdHistPtr + 1) % kBaseOwdHistSize;
+ lastBaseOwdAddT_us = time_us;
+ baseOwd = UINT32_MAX;
+ baseOwdHistMin = UINT32_MAX;
+ for (int n = 0; n < kBaseOwdHistSize; n++)
+ baseOwdHistMin = std::min(baseOwdHistMin, baseOwdHist[n]);
+ /*
+ * _Very_ long periods of congestion can cause the base delay to increase
+ * with the effect that the queue delay is estimated wrong, therefore we seek to
+ * refresh the whole thing by deliberately allowing the network queue to drain
+ */
+ if (time_us - lastBaseDelayRefreshT_us > kBaseDelayUpdateInterval_us*(kBaseOwdHistSize - 1)) {
+ lastBaseDelayRefreshT_us = time_us;
+ }
+ }
+ return ackedOwd;
+}
+
+/*
+* Get the base one way delay
+*/
+uint32_t ScreamTx::getBaseOwd() {
+ return std::min(baseOwd, baseOwdHistMin);
+}
+
+/*
+* Get the queue delay fraction
+*/
+float ScreamTx::getQueueDelayFraction() {
+ return queueDelay / queueDelayTarget;
+}
+
+/*
+* Compute congestion indicator
+*/
+void ScreamTx::computeQueueDelayTrend() {
+ queueDelayTrend = 0.0;
+ int ptr = queueDelayFractionHistPtr;
+ float avg = 0.0f, x1, x2, a0, a1;
+
+ for (int n = 0; n < kQueueDelayFractionHistSize; n++) {
+ avg += queueDelayFractionHist[ptr];
+ ptr = (ptr + 1) % kQueueDelayFractionHistSize;
+ }
+ avg /= kQueueDelayFractionHistSize;
+
+ ptr = queueDelayFractionHistPtr;
+ x2 = 0.0f;
+ a0 = 0.0f;
+ a1 = 0.0f;
+ for (int n = 0; n < kQueueDelayFractionHistSize; n++) {
+ x1 = queueDelayFractionHist[ptr] - avg;
+ a0 += x1 * x1;
+ a1 += x1 * x2;
+ x2 = x1;
+ ptr = (ptr + 1) % kQueueDelayFractionHistSize;
+ }
+ if (a0 > 0) {
+ queueDelayTrend = std::max(0.0f, std::min(1.0f, (a1 / a0)*queueDelayFractionAvg));
+ }
+}
+
+/*
+* Compute indicators of shared bottleneck
+*/
+void ScreamTx::computeSbd() {
+ float queueDelayNorm, tmp;
+ queueDelaySbdMean = 0.0;
+ queueDelaySbdMeanSh = 0.0;
+ queueDelaySbdVar = 0.0;
+ int ptr = queueDelayNormHistPtr;
+ for (int n = 0; n < kQueueDelayNormHistSize; n++) {
+ queueDelayNorm = queueDelayNormHist[ptr];
+ queueDelaySbdMean += queueDelayNorm;
+ if (n >= kQueueDelayNormHistSize - kQueueDelayNormHistSizeSh) {
+ queueDelaySbdMeanSh += queueDelayNorm;
+ }
+ ptr = (ptr + 1) % kQueueDelayNormHistSize;
+ }
+ queueDelaySbdMean /= kQueueDelayNormHistSize;
+ queueDelaySbdMeanSh /= kQueueDelayNormHistSizeSh;
+
+ ptr = queueDelayNormHistPtr;
+ for (int n = 0; n < kQueueDelayNormHistSize; n++) {
+ queueDelayNorm = queueDelayNormHist[ptr];
+ tmp = queueDelayNorm - queueDelaySbdMean;
+ queueDelaySbdVar += tmp * tmp;
+ queueDelaySbdSkew += tmp * tmp * tmp;
+ ptr = (ptr + 1) % kQueueDelayNormHistSize;
+ }
+ queueDelaySbdVar /= kQueueDelayNormHistSize;
+ queueDelaySbdSkew /= kQueueDelayNormHistSize;
+}
+
+/*
+* true if the queueDelayTarget is increased due to
+* detected competing flows
+*/
+bool ScreamTx::isCompetingFlows() {
+ return queueDelayTarget > queueDelayTargetMin;
+}
+
+/*
+* Get queue delay trend
+*/
+float ScreamTx::getQueueDelayTrend() {
+ return queueDelayTrend;
+}
+
+/*
+* Determine active streams
+*/
+void ScreamTx::determineActiveStreams(uint64_t time_us) {
+ float surplusBitrate = 0.0f;
+ float sumPrio = 0.0;
+ bool streamSetInactive = false;
+ for (int n = 0; n < nStreams; n++) {
+ if (time_us - streams[n]->lastFrameT_us > 1000000 && streams[n]->isActive) {
+ streams[n]->isActive = false;
+ surplusBitrate += streams[n]->targetBitrate;
+ streams[n]->targetBitrate = streams[n]->minBitrate;
+ streamSetInactive = true;
+ }
+ else {
+ sumPrio += streams[n]->targetPriority;
+ }
+ }
+ if (streamSetInactive) {
+ for (int n = 0; n < nStreams; n++) {
+ if (streams[n]->isActive) {
+ streams[n]->targetBitrate = std::min(streams[n]->maxBitrate,
+ streams[n]->targetBitrate +
+ surplusBitrate*streams[n]->targetPriority / sumPrio);
+ }
+ }
+ }
+}
+
+/*
+* Add credit to streams that was not served
+*/
+void ScreamTx::addCredit(uint64_t time_us, Stream* servedStream, int transmittedBytes) {
+ /*
+ * Add a credit to stream(s) that did not get priority to transmit RTP packets
+ */
+ if (nStreams == 1)
+ /*
+ * Skip if only one stream to save CPU
+ */
+ return;
+ int maxCredit = 10 * mss;
+ for (int n = 0; n < nStreams; n++) {
+ Stream *tmp = streams[n];
+ if (tmp != servedStream) {
+ int credit = (int)(transmittedBytes*tmp->targetPriority * servedStream->targetPriorityInv);
+ if (tmp->rtpQueue->sizeOfQueue() > 0) {
+ tmp->credit += credit;
+ }
+ else {
+ tmp->credit += credit;
+ if (tmp->credit > maxCredit) {
+ tmp->creditLost += tmp->credit - maxCredit;
+ tmp->credit = maxCredit;
+ }
+ //tmp->credit = std::min(10 * mss, tmp->credit + credit);
+ }
+ }
+ }
+}
+
+/*
+* Subtract credit from served stream
+*/
+void ScreamTx::subtractCredit(uint64_t time_us, Stream* servedStream, int transmittedBytes) {
+ /*
+ * Subtract a credit equal to the number of transmitted bytes from the stream that
+ * transmitted a packet
+ */
+ if (nStreams == 1)
+ /*
+ * Skip if only one stream to save CPU
+ */
+ return;
+ servedStream->credit = std::max(0, servedStream->credit - transmittedBytes);
+}
+ScreamTx::Stream::Stream(ScreamTx *parent_,
+ RtpQueueIface *rtpQueue_,
+ uint32_t ssrc_,
+ float priority_,
+ float minBitrate_,
+ float startBitrate_,
+ float maxBitrate_,
+ float rampUpSpeed_,
+ float maxRtpQueueDelay_,
+ float txQueueSizeFactor_,
+ float queueDelayGuard_,
+ float lossEventRateScale_,
+ float ecnCeEventRateScale_) {
+ parent = parent_;
+ rtpQueue = rtpQueue_;
+ ssrc = ssrc_;
+ targetPriority = priority_;
+ targetPriorityInv = 1.0f / targetPriority;
+ minBitrate = minBitrate_;
+ maxBitrate = maxBitrate_;
+ targetBitrate = std::min(maxBitrate, std::max(minBitrate, startBitrate_));
+ rampUpSpeed = rampUpSpeed_;
+ maxRtpQueueDelay = maxRtpQueueDelay_;
+ txQueueSizeFactor = txQueueSizeFactor_;
+ queueDelayGuard = queueDelayGuard_;
+ lossEventRateScale = lossEventRateScale_;
+ ecnCeEventRateScale = ecnCeEventRateScale_;
+ targetBitrateHistUpdateT_us = 0;
+ targetBitrateI = 1.0f;
+ credit = 0;
+ creditLost = 0;
+ bytesTransmitted = 0;
+ bytesAcked = 0;
+ bytesLost = 0;
+ hiSeqAck = 0;
+ hiSeqTx = 0;
+ rateTransmitted = 0.0f;
+ rateAcked = 0.0f;
+ rateLost = 0.0f;
+ lossEventFlag = false;
+ ecnCeEventFlag = false;
+ txSizeBitsAvg = 0.0f;
+ lastRateUpdateT_us = 0;
+ lastBitrateAdjustT_us = 0;
+ lastTargetBitrateIUpdateT_us = 0;
+ bytesRtp = 0;
+ rateRtp = 0.0f;
+ lastLossDetectIx = -1;
+ ecnCeMarkedBytes = 0;
+ timeTxAck_us = 0;
+
+ for (int n = 0; n < kRateUpDateSize; n++) {
+ rateRtpHist[n] = 0.0f;
+ rateAckedHist[n] = 0.0f;
+ rateLostHist[n] = 0.0f;
+ rateTransmittedHist[n] = 0.0f;
+ }
+ rateUpdateHistPtr = 0;
+ for (int n = 0; n < kTargetBitrateHistSize; n++) {
+ targetBitrateHist[n] = 0;
+ }
+ targetBitrateHistPtr = 0;
+ targetRateScale = 1.0;
+ isActive = false;
+ lastFrameT_us = 0;
+ initTime_us = 0;
+ rtpQueueDiscard = false;
+ lastRtpQueueDiscardT_us = 0;
+ rateLost = 0.0;
+ bytesLost = 0;
+ wasRepairLoss = false;
+ repairLoss = false;
+ for (int n = 0; n < kMaxTxPackets; n++)
+ txPackets[n].isUsed = false;
+ txPacketsPtr = 0;
+}
+
+/*
+* Update the estimated max media rate
+*/
+void ScreamTx::Stream::updateRate(uint64_t time_us) {
+ if (lastRateUpdateT_us != 0) {
+ float tDelta = (time_us - lastRateUpdateT_us) * 1e-6f;
+
+ rateTransmittedHist[rateUpdateHistPtr] = bytesTransmitted*8.0f / tDelta;
+ rateAckedHist[rateUpdateHistPtr] = bytesAcked*8.0f / tDelta;
+ rateLostHist[rateUpdateHistPtr] = bytesLost*8.0f / tDelta;
+ rateRtpHist[rateUpdateHistPtr] = bytesRtp * 8.0f / tDelta;
+ rateUpdateHistPtr = (rateUpdateHistPtr + 1) % kRateUpDateSize;
+ rateTransmitted = 0.0f;
+ rateAcked = 0.0f;
+ rateLost = 0.0f;
+ rateRtp = 0.0f;
+ for (int n = 0; n < kRateUpDateSize; n++) {
+ rateTransmitted += rateTransmittedHist[n];
+ rateAcked += rateAckedHist[n];
+ rateLost += rateLostHist[n];
+ rateRtp += rateRtpHist[n];
+ }
+ rateTransmitted /= kRateUpDateSize;
+ rateAcked /= kRateUpDateSize;
+ rateLost /= kRateUpDateSize;
+ rateRtp /= kRateUpDateSize;
+ if (rateRtp > 0) {
+ /*
+ * Video coders are strange animals.. In certain cases the average bitrate is
+ * consistently lower or higher than the target bitare. This additonal scaling compensates
+ * for this anomaly.
+ */
+ const float alpha = 0.005f;
+ targetRateScale *= (1.0f - alpha);
+ targetRateScale += alpha*targetBitrate / rateRtp;
+ targetRateScale = std::min(1.25f, std::max(0.8f, targetRateScale));
+ }
+ }
+
+ bytesTransmitted = 0;
+ bytesAcked = 0;
+ bytesRtp = 0;
+ bytesLost = 0;
+ lastRateUpdateT_us = time_us;
+}
+
+/*
+* Get the estimated maximum media rate
+*/
+float ScreamTx::Stream::getMaxRate() {
+ return std::max(rateTransmitted, rateAcked);
+}
+
+/*
+* The the stream that matches SSRC
+*/
+ScreamTx::Stream* ScreamTx::getStream(uint32_t ssrc) {
+ for (int n = 0; n < nStreams; n++) {
+ if (streams[n]->isMatch(ssrc)) {
+ return streams[n];
+ }
+ }
+ return NULL;
+}
+
+/*
+* Get the target bitrate.
+* This function returns a value -1 if loss of RTP packets is detected,
+* either because of loss in network or RTP queue discard
+*/
+float ScreamTx::Stream::getTargetBitrate() {
+
+ bool requestRefresh = isRtpQueueDiscard() || repairLoss;
+ repairLoss = false;
+ if (requestRefresh && !wasRepairLoss) {
+ wasRepairLoss = true;
+ return -1.0;
+ }
+ float rate = targetRateScale*targetBitrate;
+ /*
+ * Video coders are strange animals.. In certain cases a very frequent rate requests can confuse the
+ * rate control logic in the coder
+ */
+ wasRepairLoss = false;
+ return rate;
+}
+
+/*
+* A small history of past max bitrates is maintained and the max value is picked.
+* This solves a problem where consequtive rate decreases can give too low
+* targetBitrateI values.
+*/
+void ScreamTx::Stream::updateTargetBitrateI(float br) {
+ targetBitrateHist[targetBitrateHistPtr] = std::min(br, targetBitrate);
+ targetBitrateHistPtr = (targetBitrateHistPtr + 1) % kTargetBitrateHistSize;
+ targetBitrateI = std::min(br, targetBitrate);
+ for (int n = 0; n < kTargetBitrateHistSize; n++) {
+ targetBitrateI = std::max(targetBitrateI, targetBitrateHist[n]);
+ }
+
+}
+
+/*
+* Update the target bitrate, the target bitrate includes the RTP overhead
+*/
+void ScreamTx::Stream::updateTargetBitrate(uint64_t time_us) {
+ /*
+ * Compute a maximum bitrate, this bitrates includes the RTP overhead
+ */
+ float br = getMaxRate();
+ float rateRtpLimit = br;
+ if (initTime_us == 0) {
+ /*
+ * Initialize if the first time
+ */
+ initTime_us = time_us;
+ lastRtpQueueDiscardT_us = time_us;
+ }
+
+ if (lastBitrateAdjustT_us == 0) lastBitrateAdjustT_us = time_us;
+ isActive = true;
+ lastFrameT_us = time_us;
+
+ if (lossEventFlag || ecnCeEventFlag) {
+ /*
+ * Loss event handling
+ * Rate is reduced slightly to avoid that more frames than necessary
+ * queue up in the sender queue
+ */
+ if (time_us - lastTargetBitrateIUpdateT_us > 2000000) {
+ /*
+ * The timing constraint avoids that targetBitrateI
+ * is set too low in cases where a congestion event is prolonged.
+ * An accurate targetBitrateI is not of extreme importance
+ * but helps to avoid jitter spikes when SCReAM operates
+ * over fixed bandwidth or slowly varying links.
+ */
+ updateTargetBitrateI(br);
+ lastTargetBitrateIUpdateT_us = time_us;
+ }
+ if (lossEventFlag)
+ targetBitrate = std::max(minBitrate, targetBitrate*lossEventRateScale);
+ else if (ecnCeEventFlag) {
+ if (parent->isL4s) {
+ targetBitrate = std::max(minBitrate, targetBitrate*(1.0f - parent->l4sAlpha / 4.0f));
+ //updateTargetBitrateI(targetBitrate);
+ }
+ else {
+ targetBitrate = std::max(minBitrate, targetBitrate*ecnCeEventRateScale);
+ }
+ }
+ lossEventFlag = false;
+ ecnCeEventFlag = false;
+ lastBitrateAdjustT_us = time_us;
+ }
+ else {
+ if (time_us - lastBitrateAdjustT_us < kRateAdjustInterval_us)
+ return;
+ /*
+ * A scale factor that is dependent on the inflection point
+ * i.e the last known highest video bitrate
+ */
+ float sclI = (targetBitrate - targetBitrateI) / targetBitrateI;
+ sclI *= 4;
+ sclI = std::max(0.2f, std::min(1.0f, sclI*sclI));
+ float increment = 0.0f;
+
+ /*
+ * Size of RTP queue [bits]
+ * As this function is called immediately after a
+ * video frame is produced, we need to accept the new
+ * RTP packets in the queue, we subtract a number of bytes correspoding to the size
+ * of the last frame (including RTP overhead), this is simply the aggregated size
+ * of the RTP packets with the highest RTP timestamp
+ */
+ int lastBytes = rtpQueue->getSizeOfLastFrame();
+ int txSizeBits = std::max(0, rtpQueue->bytesInQueue() - lastBytes) * 8;
+
+ float alpha = 0.5f;
+
+ txSizeBitsAvg = txSizeBitsAvg*alpha + txSizeBits*(1.0f - alpha);
+ /*
+ * tmp is a local scaling factor that makes rate adaptation sligthly more
+ * aggressive when competing flows (e.g file transfers) are detected
+ */
+ float rampUpSpeedTmp = std::min(rampUpSpeed, targetBitrate*0.5f);
+ if (parent->isCompetingFlows()) {
+ rampUpSpeedTmp *= 2.0f;
+ }
+
+ float rtpQueueDelay = rtpQueue->getDelay(time_us * 1e-6f);
+ if (rtpQueueDelay > maxRtpQueueDelay &&
+ (time_us - lastRtpQueueDiscardT_us > kMinRtpQueueDiscardInterval_us)) {
+ /*
+ * RTP queue is cleared as it is becoming too large,
+ * Function is however disabled initially as there is no reliable estimate of the
+ * throughput in the initial phase.
+ */
+ rtpQueue->clear();
+
+ rtpQueueDiscard = true;
+
+ lastRtpQueueDiscardT_us = time_us;
+ targetRateScale = 1.0;
+ txSizeBitsAvg = 0.0f;
+ }
+ else if (parent->inFastStart && rtpQueueDelay < 0.1f) {
+ /*
+ * Increment bitrate, limited by the rampUpSpeed
+ */
+ increment = rampUpSpeedTmp*(kRateAdjustInterval_us * 1e-6f);
+ /*
+ * Limit increase rate near the last known highest bitrate or if priority is low
+ */
+ increment *= sclI*sqrt(targetPriority);
+ /*
+ * No increase if the actual coder rate is lower than the target
+ */
+ if (targetBitrate > rateRtpLimit*1.5f)
+ increment = 0;
+ /*
+ * Add increment
+ */
+ targetBitrate += increment;
+ wasFastStart = true;
+ }
+ else {
+ if (wasFastStart) {
+ wasFastStart = false;
+ if (time_us - lastTargetBitrateIUpdateT_us > 2000000) {
+ /*
+ * The timing constraint avoids that targetBitrateI
+ * is set too low in cases where a
+ * congestion event is prolonged
+ */
+ updateTargetBitrateI(br);
+ lastTargetBitrateIUpdateT_us = time_us;
+ }
+ }
+
+ /*
+ * Update target rate
+ * At very low bitrates it is necessary to actively try to push the
+ * the bitrate up some extra
+ */
+ float incrementScale = 1.0f + 0.05f*std::min(1.0f, 50000.0f / targetBitrate);
+
+ float increment = incrementScale*br;
+ if (!parent->isL4s || parent->l4sAlpha < 0.001) {
+ /*
+ * Apply the extra precaution with respect to queue delay and
+ * RTP queue only if L4S is not running or when ECN marking does not occur for a longer period
+ * scl is based on the queue delay trend
+ */
+ float scl = queueDelayGuard*parent->getQueueDelayTrend();
+ if (parent->isCompetingFlows())
+ scl *= 0.05f;
+ increment = increment*(1.0f - scl) - txQueueSizeFactor*txSizeBitsAvg;
+ }
+ increment -= targetBitrate;
+ if (txSizeBits > 12000 && increment > 0)
+ increment = 0;
+
+ if (increment > 0) {
+ wasFastStart = true;
+ if (!parent->isCompetingFlows()) {
+ /*
+ * Limit the bitrate increase so that it does not go faster than rampUpSpeedTmp
+ * This limitation is not in effect if competing flows are detected
+ */
+ increment *= sclI;
+ increment = std::min(increment, (float)(rampUpSpeedTmp*(kRateAdjustInterval_us * 1e-6)));
+ }
+ if (targetBitrate > rateRtpLimit*1.5f) {
+ /*
+ * Limit increase if the target bitrate is considerably higher than the actual
+ * bitrate, this is an indication of an idle source.
+ */
+ increment = 0;
+ }
+ }
+ else {
+ /*
+ * Avoid that the target bitrate is reduced if it actually is the media
+ * coder that limits the output rate e.g due to inactivity
+ */
+ if (rateRtp < targetBitrate*0.8f)
+ increment = 0.0f;
+ /*
+ * Also avoid that the target bitrate is reduced if
+ * the coder bitrate is higher
+ * than the target.
+ * The possible reason is that a large I frame is transmitted, another reason is
+ * complex dynamic content.
+ */
+ if (rateRtp > targetBitrate*2.0f)
+ increment = 0.0f;
+ }
+ targetBitrate += increment;
+
+ }
+ lastBitrateAdjustT_us = time_us;
+ }
+
+ targetBitrate = std::min(maxBitrate, std::max(minBitrate, targetBitrate));
+}
+
+bool ScreamTx::Stream::isRtpQueueDiscard() {
+ bool tmp = rtpQueueDiscard;
+ rtpQueueDiscard = false;
+ return tmp;
+}
+
+/*
+* Adjust (enforce) proper prioritization between active streams
+* at regular intervals. This is a necessary addon to mitigate
+* issues that VBR media brings
+* The function consists of equal measures or rational thinking and
+* black magic, which means that there is no 100% guarantee that
+* will always work.
+*/
+void ScreamTx::adjustPriorities(uint64_t time_us) {
+ if (nStreams == 1 || time_us - lastAdjustPrioritiesT_us < 1000000) {
+ /*
+ * Skip if only one stream or if adjustment done less than 5s ago
+ */
+ return;
+ }
+
+ if (queueDelayTrend > 0.02) {
+ /*
+ * Adjust only if there is some evidence of congestion
+ */
+ int avgCreditLost = 0;
+ int avgCreditLostN = 0;
+ for (int n = 0; n < nStreams; n++) {
+ avgCreditLost += streams[n]->creditLost;
+ if (streams[n]->isActive)
+ avgCreditLostN++;
+ }
+ if (avgCreditLostN <= 1) {
+ /*
+ * At the most 1 steam active, skip adjustment
+ */
+ return;
+ }
+
+ avgCreditLost /= avgCreditLostN;
+ for (int n = 0; n < nStreams; n++) {
+ if (streams[n]->isActive) {
+ if (streams[n]->creditLost < avgCreditLost &&
+ streams[n]->targetBitrate > streams[n]->rateRtp) {
+ /*
+ * Stream is using more of its share than the average
+ * bitrate is likelky too high, reduce target bitrate
+ * This algorithm works best when we want to ensure
+ * different priorities
+ */
+ streams[n]->targetBitrate = std::max(streams[n]->minBitrate, streams[n]->targetBitrate*0.9f);
+ }
+ }
+ }
+
+ for (int n = 0; n < nStreams; n++)
+ streams[n]->creditLost = 0;
+
+
+ lastAdjustPrioritiesT_us = time_us;
+
+ }
+ if (time_us - lastAdjustPrioritiesT_us < 20000000) {
+ /*
+ * Clear old statistics of unused credits
+ */
+ for (int n = 0; n < nStreams; n++)
+ streams[n]->creditLost = 0;
+
+
+ lastAdjustPrioritiesT_us = time_us;
+ }
+}
+
+/*
+* Get the prioritized stream
+*/
+ScreamTx::Stream* ScreamTx::getPrioritizedStream(uint64_t time_us) {
+ /*
+ * Function that prioritizes between streams, this function may need
+ * to be modified to handle the prioritization better for e.g
+ * FEC, SVC etc.
+ */
+ if (nStreams == 1)
+ /*
+ * Skip if only one stream to save CPU
+ */
+ return streams[0];
+
+ int maxCredit = 1;
+ Stream *stream = NULL;
+ /*
+ * Pick a stream with credit higher or equal to
+ * the size of the next RTP packet in queue for the given stream.
+ */
+ for (int n = 0; n < nStreams; n++) {
+ Stream *tmp = streams[n];
+ if (tmp->rtpQueue->sizeOfQueue() == 0) {
+ /*
+ * Queue empty
+ */
+ }
+ else {
+ /*
+ * Pick stream if it has the highest credit so far
+ */
+ if (tmp->credit >= std::max(maxCredit, tmp->rtpQueue->sizeOfNextRtp())) {
+ stream = tmp;
+ maxCredit = tmp->credit;
+ }
+ }
+ }
+ if (stream != NULL) {
+ return stream;
+ }
+ /*
+ * If the above doesn't give a candidate..
+ * Pick the stream with the highest priority that also
+ * has at least one RTP packet in queue.
+ */
+ float maxPrio = 0.0;
+ for (int n = 0; n < nStreams; n++) {
+ Stream *tmp = streams[n];
+ float priority = tmp->targetPriority;
+ if (tmp->rtpQueue->sizeOfQueue() > 0 && priority > maxPrio) {
+ maxPrio = priority;
+ stream = tmp;
+ }
+ }
+ return stream;
+}
diff --git a/Laptop/scream/scream_sender/code/ScreamTx.h b/Laptop/scream/scream_sender/code/ScreamTx.h
new file mode 100644
index 0000000000000000000000000000000000000000..3c802fb8df75ad05de70e23a6455ae77f7e2621d
--- /dev/null
+++ b/Laptop/scream/scream_sender/code/ScreamTx.h
@@ -0,0 +1,627 @@
+#ifndef SCREAM_TX
+#define SCREAM_TX
+
+#include <string.h>
+#include <iostream>
+#include <cstdint>
+using namespace std;
+
+/*
+* This module implements the sender side of SCReAM,
+* see https://github.com/EricssonResearch/scream/blob/master/SCReAM-description.pdf
+* for details on how it is integrated in audio/video platforms
+* A full implementation needs the additional code for
+* + RTCP feedback (e.g using RFC3611 XR elements)
+* + RTP queue(s), one queue per stream, see SCReAM description for interface description
+* + Other obvious stuff such as RTP payload packetizer, video+audio capture, coders....
+*
+*/
+
+// ==== Default parameters (if tuning necessary) ====
+// Connection related default parameters
+// CWND scale factor upon loss event
+static const float kLossBeta = 0.8f;
+// CWND scale factor upon ECN-CE event
+static const float kEcnCeBeta = 0.9f;
+// Min and max queue delay target
+static const float kQueueDelayTargetMin = 0.1f; //ms
+// Enable shared botleneck detection and queue delay target adjustement
+// good if SCReAM needs to compete with e.g FTP but
+// Can in some cases cause self-inflicted congestion
+// i.e the e2e delay can become large even though
+// there is no competing traffic present
+// For some reason, self-inflicted congestion is easily triggered
+// when an audio + video stream is run, so bottomline is that
+// this feature is a bit shaky
+static const bool kEnableSbd = false;
+// CWND up and down gain factors
+static const float kGainUp = 1.0f;
+static const float kGainDown = 2.0f;
+
+// Stream related default parameters
+// Max video rampup speed in bps/s (bits per second increase per second)
+static const float kRampUpSpeed = 200000.0f; // bps/s
+// Max RTP queue delay, RTP queue is cleared if this value is exceeded
+static const float kMaxRtpQueueDelay = 0.1; // 0.1s
+// Compensation factor for RTP queue size
+// A higher value such as 0.2 gives less jitter esp. in wireless (LTE)
+// but potentially also lower link utilization
+static const float kTxQueueSizeFactor = 0.2f;
+// Compensation factor for detected congestion in rate computation
+// A higher value such as 0.5 gives less jitter esp. in wireless (LTE)
+// but potentially also lower link utilization
+static const float kQueueDelayGuard = 0.1f;
+// Video rate scaling due to loss events
+static const float kLossEventRateScale = 0.9f;
+// Video rate scaling due to ECN marking events
+static const float kEcnCeEventRateScale = 0.95f;
+
+
+
+// Constants
+/*
+* Timestamp sampling rate for SCReAM feedback
+*/
+static const float kTimestampRate = 1000.0f;
+/*
+* Max number of RTP packets in flight
+* With and MSS = 1200 byte and an RTT = 200ms
+* this is enount to support media bitrates of ~50Mbps
+* Note, 65536 % kMaxTxPackets must be zero
+*/
+static const int kMaxTxPackets = 2048;
+/*
+* Max number of streams
+*/
+static const int kMaxStreams = 10;
+/*
+* History vectors
+*/
+static const int kBaseOwdHistSize = 50;
+static const int kQueueDelayNormHistSize = 200;
+static const int kQueueDelayNormHistSizeSh = 50;
+static const int kQueueDelayFractionHistSize = 20;
+static const int kBytesInFlightHistSizeMax = 60;
+static const int kRateUpDateSize = 4;
+static const int kTargetBitrateHistSize = 3;
+static const int kLossRateHistSize = 10;
+
+class RtpQueueIface;
+class ScreamTx {
+public:
+ /*
+ * Constructor, see constant definitions above for an explanation of parameters
+ * cwnd > 0 sets a different initial congestion window, for example it can be set to
+ * initialrate/8*rtt
+ * cautiousPacing is set in the range [0.0..1.0]. A higher values restricts the transmission rate of large key frames
+ * which can be beneficial if it is evident that large key frames cause packet drops, for instance due to
+ * reduced buffer size in wireless modems.
+ * This is however at the potential cost of an overall increased transmission delay also when links are uncongested
+ * as the RTP packets are more likely to be buffered up on the sender side when cautiousPacing is set close to 1.0.
+ * lossBeta == 1.0 means that packet losses are ignored by the congestion control
+ * bytesInFlightHistSize can be set to a larger value than 5(s) for enhanced robustness to media coders that are idle
+ * for long periods
+ * isL4s = true changes congestion window reaction to ECN marking to a scalable function, similar to DCTCP
+ */
+ ScreamTx(float lossBeta = kLossBeta,
+ float ecnCeBeta = kEcnCeBeta,
+ float queueDelayTargetMin = kQueueDelayTargetMin,
+ bool enableSbd = kEnableSbd,
+ float gainUp = kGainUp,
+ float gainDown = kGainDown,
+ int cwnd = 0, // An initial cwnd larger than 2*mss
+ float cautiousPacing = 0.0f,
+ int bytesInFlightHistSize = 5,
+ bool isL4s = false,
+ bool openWindow = false);
+
+ ~ScreamTx();
+
+ /*
+ * Register a new stream {SSRC,PT} tuple,
+ * with a priority value in the range ]0.0..1.0]
+ * where 1.0 denotes the highest priority.
+ * It is recommended that at least one stream has prioritity 1.0.
+ * Bitrates are specified in bps
+ * See constant definitions above for an explanation of other default parameters
+ */
+ void registerNewStream(RtpQueueIface *rtpQueue,
+ uint32_t ssrc,
+ float priority, // priority in range ]0.0 .. 1.0], 1.0 is highest
+ float minBitrate, // Min target bitrate
+ float startBitrate, // Starting bitrate
+ float maxBitrate, // Max target bitrate
+ float rampUpSpeed = kRampUpSpeed,
+ float maxRtpQueueDelay = kMaxRtpQueueDelay,
+ float txQueueSizeFactor = kTxQueueSizeFactor,
+ float queueDelayGuard = kQueueDelayGuard,
+ float lossEventRateScale = kLossEventRateScale,
+ float ecnCeEventRateScale = kEcnCeEventRateScale);
+
+ /*
+ * Updates the min and max bitrates for an existing stream
+ */
+ void updateBitrateStream(uint32_t ssrc,
+ float minBitrate,
+ float maxBitrate);
+
+ /*
+ * Access the configured RtpQueue of an existing stream
+ */
+ RtpQueueIface * getStreamQueue(uint32_t ssrc);
+
+ /*
+ * Call this function for each new video frame
+ * Note : isOkToTransmit should be called after newMediaFrame
+ */
+ void newMediaFrame(uint64_t time_us, uint32_t ssrc, int bytesRtp);
+
+ /*
+ * Function determines if an RTP packet with SSRC can be transmitted
+ * Return values :
+ * 0.0 : RTP packet with SSRC can be immediately transmitted
+ * addTransmitted must be called if packet is transmitted as a result of this
+ * >0.0 : Time [s] until this function should be called again
+ * This can be used to start a timer
+ * Note that a call to newMediaFrame or incomingFeedback should
+ * cause an immediate call to isOkToTransmit
+ * -1.0 : No RTP packet available to transmit or send window is not large enough
+ */
+ float isOkToTransmit(uint64_t time_us, uint32_t &ssrc);
+
+ /*
+ * Add packet to list of transmitted packets
+ * should be called when an RTP packet transmitted
+ * Return time until isOkToTransmit can be called again
+ */
+ float addTransmitted(uint64_t timestamp_us, // Wall clock ts when packet is transmitted
+ uint32_t ssrc,
+ int size,
+ uint16_t seqNr);
+
+ /*
+ * New incoming feedback, this function
+ * triggers a CWND update
+ * The SCReAM timestamp is in jiffies, where the frequency is controlled
+ * by the timestamp clock frequency (default 1000Hz)
+ * The ackVector indicates recption of the 64 RTP SN prior to highestSeqNr
+ * Note : isOkToTransmit should be called after incomingFeedback
+ * ecnCeMarkedBytes indicates the cumulative number of bytes that are ECN-CE marked
+ */
+ void incomingFeedback(uint64_t time_us,
+ uint32_t ssrc, // SSRC of stream
+ uint32_t timestamp, // SCReAM FB timestamp [jiffy]
+ uint16_t highestSeqNr, // Highest ACKed RTP sequence number
+ uint64_t ackVector, // ACK vector
+ uint16_t ecnCeMarkedBytes = 0); // Number of ECN marked bytes
+
+ /*
+ * Parse feedback according to the format below. It is up to the
+ * wrapper application this RTCP from a compound RTCP if needed
+ * BT = 255, means that this is experimental use
+ *
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |V=2|P|reserved | PT=XR=207 | length=6 |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | SSRC |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | BT=255 | reserved | block length=4 |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | SSRC of source |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Highest recv. seq. nr. (16b) | ECN_CE_bytes |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Ack vector (b0-31) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Ack vector (b32-63) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Timestamp (32bits) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+ void incomingFeedback(uint64_t time_us,
+ unsigned char* buf,
+ int size);
+
+ /*
+ * Get the target bitrate for stream with SSRC
+ * NOTE!, Because SCReAM operates on RTP packets, the target bitrate will
+ * also include the RTP overhead. This means that a subsequent call to set the
+ * media coder target bitrate must subtract an estimate of the RTP + framing
+ * overhead. This is not critical for Video bitrates but can be important
+ * when SCReAM is used to congestion control e.g low bitrate audio streams
+ * Function returns -1 if a loss is detected, this signal can be used to
+ * request a new key frame from a video encoder
+ */
+ float getTargetBitrate(uint32_t ssrc);
+
+ /*
+ * Set target priority for a given stream, priority value should be in range ]0.0..1.0]
+ */
+ void setTargetPriority(uint32_t ssrc, float aPriority);
+
+ /*
+ * Get verbose log information
+ */
+ void getLog(float time, char *s);
+
+ /*
+ * Get verbose log information
+ */
+ void getShortLog(float time, char *s);
+
+ /*
+ * Get overall simplified statistics
+ */
+ void getStatistics(float time, char *s);
+
+
+private:
+ /*
+ * Struct for list of RTP packets in flight
+ */
+ struct Transmitted {
+ uint64_t timeTx_us;
+ uint32_t timestamp;
+ int size;
+ uint16_t seqNr;
+ bool isUsed;
+ bool isAcked;
+ bool isAfterReceivedEdge;
+
+ };
+
+ /*
+ * Statistics for the network congestion control and the
+ * stream[0]
+ */
+ class Statistics {
+ public:
+ Statistics();
+ void getSummary(float time, char s[]);
+ void add(float rateTx, float rateLost, float rtt, float queueDelay);
+ private:
+ float lossRateHist[kLossRateHistSize];
+ float rateLostAcc;
+ int rateLostN;
+ int lossRateHistPtr;
+ float avgRateTx;
+ float avgRtt;
+ float avgQueueDelay;
+ float sumRateTx;
+ float sumRateLost;
+
+ };
+
+
+ /*
+ * One instance is created for each {SSRC,PT} tuple
+ */
+ class Stream {
+ public:
+ Stream(ScreamTx *parent,
+ RtpQueueIface *rtpQueue,
+ uint32_t ssrc,
+ float priority,
+ float minBitrate,
+ float startBitrate,
+ float maxBitrate,
+ float rampUpSpeed,
+ float maxRtpQueueDelay,
+ float txQueueSizeFactor,
+ float queueDelayGuard,
+ float lossEventRateScale,
+ float ecnCeEventRateScale);
+
+ float getMaxRate();
+
+ float getTargetBitrate();
+
+ void updateRate(uint64_t time_us);
+
+ void updateTargetBitrateI(float br);
+
+ void updateTargetBitrate(uint64_t time_us);
+
+ bool isRtpQueueDiscard();
+
+ bool isMatch(uint32_t ssrc_) { return ssrc == ssrc_; };
+ ScreamTx *parent;
+ RtpQueueIface *rtpQueue; // RTP Packet queue
+ uint32_t ssrc; // SSRC of stream
+ float rampUpSpeed;
+ float maxRtpQueueDelay;
+ float txQueueSizeFactor;
+ float queueDelayGuard;
+ float lossEventRateScale;
+ float ecnCeEventRateScale;
+
+ int credit; // Credit that is received if another stream gets
+ // priority to transmit
+ int creditLost; // Amount of lost (unused) credit, input to
+ // adjustPriorities function
+ float targetPriority; // Stream target priority
+ float targetPriorityInv;// Stream target priority inverted
+ int bytesTransmitted; // Number of bytes transmitted
+ int bytesAcked; // Number of ACKed bytes
+ int bytesLost; // Number of lost bytes
+ float rateTransmitted; // Transmitted rate
+ float rateAcked; // ACKed rate
+ float rateLost; // Lost packets (bit)rate
+ uint16_t hiSeqAck; // Highest sequence number ACKed
+ uint16_t hiSeqTx; // Highest sequence number transmitted
+ float minBitrate; // Min bitrate
+ float maxBitrate; // Max bitrate
+ float targetBitrate; // Target bitrate
+ float targetBitrateI; // Target bitrate inflection point
+ bool wasFastStart; // Was fast start
+ bool lossEventFlag; // Was loss event
+ bool ecnCeEventFlag; // Was ECN mark event
+ float txSizeBitsAvg; // Avergage nymber of bits in RTP queue
+ uint64_t lastBitrateAdjustT_us; // Last time rate was updated for this stream
+ uint64_t lastRateUpdateT_us; // Last time rate estimate was updated
+ uint64_t lastTargetBitrateIUpdateT_us; // Last time rate estimate was updated
+
+ uint64_t timeTxAck_us; // timestamp when higest ACKed SN was transmitted
+
+ int bytesRtp; // Number of RTP bytes from media coder
+ float rateRtp; // Media bitrate
+ float rateRtpHist[kRateUpDateSize];
+ float rateAckedHist[kRateUpDateSize];
+ float rateLostHist[kRateUpDateSize];
+ float rateTransmittedHist[kRateUpDateSize];
+ int rateUpdateHistPtr;
+ float targetBitrateHist[kTargetBitrateHistSize];
+ int targetBitrateHistPtr;
+ uint64_t targetBitrateHistUpdateT_us;
+ float targetRateScale;
+
+ bool isActive;
+ uint64_t lastFrameT_us;
+ uint64_t initTime_us;
+ bool rtpQueueDiscard;
+ uint64_t lastRtpQueueDiscardT_us;
+ bool wasRepairLoss;
+ bool repairLoss;
+ int lastLossDetectIx;
+ uint16_t ecnCeMarkedBytes;
+
+
+ Transmitted txPackets[kMaxTxPackets];
+ int txPacketsPtr;
+
+ };
+
+ /*
+ * Initialize values
+ */
+ void initialize(uint64_t time_us);
+
+ /*
+ * Mark ACKed RTP packets
+ */
+ void markAcked(uint64_t time_us, struct Transmitted *txPackets, uint16_t highestSeqNr, uint64_t ackVector, uint32_t timestamp, Stream *stream);
+
+ /*
+ * Update CWND
+ */
+ void updateCwnd(uint64_t time_us);
+
+ /*
+ * Detect lost RTP packets
+ */
+ void detectLoss(uint64_t time_us, struct Transmitted *txPackets, uint16_t highestSeqNr, Stream *stream);
+
+ /*
+ * Call this function at regular intervals to determine active streams
+ */
+ void determineActiveStreams(uint64_t time_us);
+
+ /*
+ * Compute 1st order prediction coefficient of queue delay multiplied by the queue delay fraction
+ * A value [0.0..1.0] indicates if queue delay is increasing
+ * This gives a rough estimate of how the queuing delay delay evolves
+ */
+ void computeQueueDelayTrend();
+
+ /*
+ * Estimate one way delay [jiffy] and updated base delay
+ * Base delay is not subtracted
+ */
+ uint32_t estimateOwd(uint64_t time_us);
+
+ /*
+ * return base delay [jiffy]
+ */
+ uint32_t getBaseOwd();
+
+ /*
+ * Compute indicators of shared bottleneck
+ */
+ void computeSbd();
+
+ /*
+ * True if competing (TCP)flows detected
+ */
+ bool isCompetingFlows();
+
+ /*
+ * Get stream with corresponding SSRC
+ */
+ Stream* getStream(uint32_t ssrc);
+
+ /*
+ * Get matching stream index for this SSRC tuple,
+ * return -1 if no match
+ */
+ int getStreamIndex(uint32_t ssrc);
+
+ /*
+ * Adjust stream bitrates to reflect priorities
+ */
+ void adjustPriorities(uint64_t time_us);
+
+ /*
+ * Get the prioritized stream
+ * Return NULL if no stream with
+ * with RTP packets
+ */
+ Stream* getPrioritizedStream(uint64_t time_us);
+
+ /*
+ * Add credit to unserved streams
+ */
+ void addCredit(uint64_t time_us,
+ Stream* servedStream,
+ int transmittedBytes);
+
+ /*
+ * Subtract used credit
+ */
+ void subtractCredit(uint64_t time_us,
+ Stream* servedStream,
+ int transmittedBytes);
+
+ /*
+ * return 1 if in fast start
+ */
+ int isInFastStart() { return inFastStart ? 1 : 0; };
+
+ /*
+ * Get the fraction between queue delay and the queue delay target
+ */
+ float getQueueDelayFraction();
+
+ /*
+ * Get the queuing delay trend
+ */
+ float getQueueDelayTrend();
+
+ /*
+ * Variables for network congestion control
+ */
+
+ /*
+ * Related to computation of queue delay and target queuing delay
+ */
+ float lossBeta;
+ float ecnCeBeta;
+ float queueDelayTargetMin;
+ bool enableSbd;
+ float gainUp;
+ float gainDown;
+ float cautiousPacing;
+
+ uint64_t sRttSh_us;
+ uint64_t sRtt_us;
+ float sRtt;
+ uint32_t ackedOwd;
+ uint32_t baseOwd;
+
+ uint32_t baseOwdHist[kBaseOwdHistSize];
+ int baseOwdHistPtr;
+ uint32_t baseOwdHistMin;
+ float queueDelay;
+ float queueDelayFractionAvg;
+ float queueDelayFractionHist[kQueueDelayFractionHistSize];
+ int queueDelayFractionHistPtr;
+ float queueDelayTrend;
+ float queueDelayTarget;
+ float queueDelayNormHist[kQueueDelayNormHistSize];
+ int queueDelayNormHistPtr;
+ float queueDelaySbdVar;
+ float queueDelaySbdMean;
+ float queueDelaySbdSkew;
+ float queueDelaySbdMeanSh;
+ float queueDelayMax;
+
+ /*
+ * CWND management
+ */
+ int bytesNewlyAcked;
+ int mss; // Maximum Segment Size
+ int cwnd; // congestion window
+ int cwndMin;
+ bool openWindow;
+ int bytesInFlight;
+ int bytesInFlightLog;
+ int bytesInFlightHistLo[kBytesInFlightHistSizeMax];
+ int bytesInFlightHistHi[kBytesInFlightHistSizeMax];
+ int bytesInFlightHistSize;
+ int bytesInFlightHistPtr;
+ int bytesInFlightMaxLo;
+ int bytesInFlightHistLoMem;
+ int bytesInFlightMaxHi;
+ int bytesInFlightHistHiMem;
+ float maxBytesInFlight;
+ int accBytesInFlightMax;
+ int nAccBytesInFlightMax;
+ float rateTransmitted;
+ float rateAcked;
+ float queueDelayTrendMem;
+ float maxRate;
+ uint64_t lastCwndUpdateT_us;
+ bool isL4s;
+ float l4sAlpha;
+ int bytesMarkedThisRtt;
+ int bytesDeliveredThisRtt;
+ uint64_t lastL4sAlphaUpdateT_us;
+ /*
+ * Loss event
+ */
+ bool lossEvent;
+ bool wasLossEvent;
+ float lossEventRate;
+
+ /*
+ * ECN-CE
+ */
+ bool ecnCeEvent;
+
+ /*
+ * Fast start
+ */
+ bool inFastStart;
+
+ /*
+ * Transmission scheduling
+ */
+ uint64_t paceInterval_us;
+ float paceInterval;
+ float rateTransmittedAvg;
+
+ /*
+ * Update control variables
+ */
+ bool isInitialized;
+ uint64_t lastSRttUpdateT_us;
+ uint64_t lastBaseOwdAddT_us;
+ uint64_t baseOwdResetT_us;
+ uint64_t lastAddToQueueDelayFractionHistT_us;
+ uint64_t lastBytesInFlightT_us;
+ uint64_t lastCongestionDetectedT_us;
+ uint64_t lastLossEventT_us;
+ uint64_t lastTransmitT_us;
+ uint64_t nextTransmitT_us;
+ uint64_t lastRateUpdateT_us;
+ uint64_t lastAdjustPrioritiesT_us;
+ uint64_t lastRttT_us;
+ uint64_t lastBaseDelayRefreshT_us;
+ uint64_t initTime_us;
+ float queueDelayMin;
+ float queueDelayMinAvg;
+
+ /*
+ * Variables for multiple steams handling
+ */
+ Stream *streams[kMaxStreams];
+ int nStreams;
+
+ /*
+ * Statistics
+ */
+ Statistics *statistics;
+
+};
+#endif
diff --git a/Laptop/scream/scream_sender/code/cmake_install.cmake b/Laptop/scream/scream_sender/code/cmake_install.cmake
new file mode 100644
index 0000000000000000000000000000000000000000..39a25e535c8c77cce8f6a49047d1a00d3aae1b16
--- /dev/null
+++ b/Laptop/scream/scream_sender/code/cmake_install.cmake
@@ -0,0 +1,34 @@
+# Install script for directory: /home/user/scream_panasonic/scream_sender/code
+
+# Set the install prefix
+if(NOT DEFINED CMAKE_INSTALL_PREFIX)
+ set(CMAKE_INSTALL_PREFIX "/usr/local")
+endif()
+string(REGEX REPLACE "/$" "" CMAKE_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}")
+
+# Set the install configuration name.
+if(NOT DEFINED CMAKE_INSTALL_CONFIG_NAME)
+ if(BUILD_TYPE)
+ string(REGEX REPLACE "^[^A-Za-z0-9_]+" ""
+ CMAKE_INSTALL_CONFIG_NAME "${BUILD_TYPE}")
+ else()
+ set(CMAKE_INSTALL_CONFIG_NAME "")
+ endif()
+ message(STATUS "Install configuration: \"${CMAKE_INSTALL_CONFIG_NAME}\"")
+endif()
+
+# Set the component getting installed.
+if(NOT CMAKE_INSTALL_COMPONENT)
+ if(COMPONENT)
+ message(STATUS "Install component: \"${COMPONENT}\"")
+ set(CMAKE_INSTALL_COMPONENT "${COMPONENT}")
+ else()
+ set(CMAKE_INSTALL_COMPONENT)
+ endif()
+endif()
+
+# Install shared libraries without execute permission?
+if(NOT DEFINED CMAKE_INSTALL_SO_NO_EXE)
+ set(CMAKE_INSTALL_SO_NO_EXE "1")
+endif()
+
diff --git a/Laptop/scream/scream_sender/code/scream_sender.cpp b/Laptop/scream/scream_sender/code/scream_sender.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..ef05df10bb147977ee315c355d43c355d2a28b64
--- /dev/null
+++ b/Laptop/scream/scream_sender/code/scream_sender.cpp
@@ -0,0 +1 @@
+// Scream sender side wrapper
#include "ScreamTx.h"
#include "RtpQueue.h"
#include "sys/socket.h"
#include "sys/types.h"
#include "netinet/in.h"
#include <string.h> /* needed for memset */
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/time.h>
#include <iostream>
#include <pthread.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/time.h>
#include <signal.h>
#include <math.h>
struct itimerval timer;
struct sigaction sa;
using namespace std;
#define BUFSIZE 2048
#define MIN_PACE_INTERVAL 0.001
#define HTTP_BUF_SIZE 10000
#define MAX_SOURCES 6
#define KEEP_ALIVE_PKT_SIZE 1
int PT = 98;
int http_sock = 0;
int fd_out_rtp;
int fd_in_rtp[MAX_SOURCES];
ScreamTx *screamTx = 0;
RtpQueue *rtpQueue[MAX_SOURCES] = {0,0,0,0,0,0};
int nSources = 0;
float delayTarget = 0.1f;
char *auth;
#define ECN_CAPABLE
/*
* ECN capable
* 0 = Not-ECT
* 1 = ECT(0)
* 2 = ECT(1)
*/
int ect = 0;
char *out_ip = "192.168.0.21";
int out_port = 30110;
char *in_ip[MAX_SOURCES];
int in_port[MAX_SOURCES];
uint32_t in_ssrc[MAX_SOURCES];
float priority[MAX_SOURCES] = {1.0,1.0,1.0,1.0,1.0,1.0};
float congestionScaleFactor = 0.9;
int bytesInFlightHistSize = 5;
float maxRate = 8192e3f;
struct sockaddr_in in_rtp_addr[MAX_SOURCES];
struct sockaddr_in out_rtp_addr;
struct sockaddr_in in_rtcp_addr;
struct sockaddr_in http_addr;
socklen_t addrlen_out_rtp;
socklen_t addrlen_dummy_rtcp;
uint64_t lastLogT = 0;
socklen_t addrlen_in_rtp[MAX_SOURCES] = {
sizeof(in_rtp_addr[0]),
sizeof(in_rtp_addr[1]),
sizeof(in_rtp_addr[2]),
sizeof(in_rtp_addr[3]),
sizeof(in_rtp_addr[4]),
sizeof(in_rtp_addr[5])};
socklen_t addrlen_in_rtcp = sizeof(in_rtcp_addr);
pthread_mutex_t lock_scream;
pthread_mutex_t lock_rtp_queue;
// Accumulated pace time, used to avoid starting very short pace timers
// this can save some complexity at very higfh bitrates
float accumulatedPaceTime = 0.0f;
bool paceTimerRunning = false;
int lastQuantRate[MAX_SOURCES] = {0,0,0,0,0,0};
const void sendCoderCommand(char *buf, char *ip);
void *txRtpThread(void *arg);
void *videoControlThread(void *arg);
int setup();
void *rxRtcpThread(void *arg);
void *rxRtpThread5(void *arg);
void *rxRtpThread4(void *arg);
void *rxRtpThread3(void *arg);
void *rxRtpThread2(void *arg);
void *rxRtpThread1(void *arg);
void *rxRtpThread0(void *arg);
void trySendRtp(uint64_t time);
long getTimeInUs(){
struct timeval tp;
gettimeofday(&tp, NULL);
long us = tp.tv_sec * 1000000 + tp.tv_usec;
return us;
}
uint64_t t0 = getTimeInUs();
uint64_t lastT = getTimeInUs();
volatile sig_atomic_t done = 0;
bool stopThread = false;
void stopAll(int signum)
{
stopThread = true;
}
void closeSockets(int signum)
{
exit(0);
}
/*
* Send a packet
*/
void sendPacket(char* buf, int size) {
sendto(fd_out_rtp, buf, size, 0, (struct sockaddr *)&out_rtp_addr, sizeof(out_rtp_addr));
}
int main(int argc, char* argv[]) {
/*
* Parse command line
*/
if (argc <= 1) {
cerr << "Usage : " << endl << " scream_sender <options> auth nsources out_ip out_port in_ip_1 in_port_1 in_ssrc_1 prio_1 .. in_ip_n in_port_n in_ssrc_n prio_n" << endl;
cerr << " -ect n : ECN capable transport, n = 1 or 2 for ECT(0) or ECT(1), 0 for not-ECT" << endl;
cerr << " -scale val : Congestion scale factor, range [0.5..1.0], default = 0.9" << endl;
cerr << " it can be necessary to set scale 1.0 if the LTE modem drops packets" << endl;
cerr << " already at low congestion levels." << endl;
cerr << " -delaytarget : Sets a queue delay target (default = 0.1s) " << endl;
cerr << " -cwvmem : Sets the memory of the congestion window validation (default 5s), max 60s" << endl;
cerr << " a larger memory can be beneficial in remote applications where the video input" << endl;
cerr << " is static for long periods. " << endl;
cerr << " -maxrate : Set max rate [kbps], default 8192." << endl;
cerr << " auth : User authorization string base64 encoded version of user:password of IP camera" << endl;
cerr << " use eg. the Linux command " << endl;
cerr << " echo -n auser:apassword | base64 " << endl;
cerr << " nsources : Number of sources, min=1, max=" << MAX_SOURCES << endl;
cerr << " out_ip : remote (SCReAM receiver) IP address" << endl;
cerr << " out_port : remote (SCReAM receiver) port" << endl;
cerr << " in_ip_1 : IP address for video coder 1 " << endl;
cerr << " in_port_1 : port for RTP media from video coder 1 " << endl;
cerr << " in_ssrc_1 : SSRC (hexadecimal) for RTP media from video coder 1 " << endl;
cerr << " prio_1 : Bitrate priority for video coder 1, range [0.1..1.0] " << endl;
cerr << " ." << endl;
cerr << " ." << endl;
cerr << " in_ip_n : IP address for video coder n " << endl;
cerr << " in_port_n : port for RTP media from video coder n " << endl;
cerr << " in_ssrc_n : SSRC (hexadecimal) for RTP media from video coder n " << endl;
cerr << " prio_n : Bitrate priority for video coder n, range [0.1..1.0] " << endl;
exit(-1);
}
int ix = 1;
int nExpectedArgs = 2+2+1;
while (strstr(argv[ix],"-")) {
if (strstr(argv[ix],"-ect")) {
ect = atoi(argv[ix+1]);
ix+=2;
nExpectedArgs += 2;
if (ect < 0 || ect > 2) {
cerr << "ect must be 0, 1 or 2 " << endl;
exit(0);
}
}
if (strstr(argv[ix],"-scale")) {
congestionScaleFactor = atof(argv[ix+1]);
ix+=2;
nExpectedArgs += 2;
}
if (strstr(argv[ix],"-delaytarget")) {
delayTarget = atof(argv[ix+1]);
ix+=2;
nExpectedArgs += 2;
}
if (strstr(argv[ix],"-cwvmem")) {
bytesInFlightHistSize = atoi(argv[ix+1]);
ix+=2;
nExpectedArgs += 2;
if (bytesInFlightHistSize > kBytesInFlightHistSizeMax || bytesInFlightHistSize < 2) {
cerr << "cwvmem must be in range [2 .. " << kBytesInFlightHistSizeMax << "]" << endl;
exit(0);
}
}
if (strstr(argv[ix],"-maxrate")) {
maxRate = atoi(argv[ix+1])*1000.0f;
ix+=2;
nExpectedArgs += 2;
}
}
auth = argv[ix]; ix++;
nSources = atoi(argv[ix]);
nExpectedArgs += nSources*4;
ix++;
if (nSources < 1 || nSources > MAX_SOURCES) {
cerr << "number of sources must be in interval [0.." << MAX_SOURCES << "]" << endl;
exit(0);
}
if (argc-1 != nExpectedArgs-1) {
cerr << "expected " << (nExpectedArgs-1) << " arguments, but see " << (argc-1) << " ditto ?" << endl;
exit(0);
}
out_ip = argv[ix];ix++;
out_port = atoi(argv[ix]);ix++;
for (int n=0; n < nSources; n++) {
char s[20];
in_ip[n] = argv[ix];ix++;
in_port[n] = atoi(argv[ix]);ix++;
strcpy(s, argv[ix]);ix++;
sscanf(s,"%x",&in_ssrc[n]);
priority[n] = atof(argv[ix]);ix++;
}
if (setup() == 0)
return 0;
struct sigaction action;
memset(&action, 0, sizeof(struct sigaction));
action.sa_handler = stopAll;
sigaction(SIGTERM, &action, NULL);
sigaction(SIGINT, &action, NULL);
char buf[HTTP_BUF_SIZE];
cerr << "Configure media sources "<<endl;
for (int n=0; n < nSources; n++) {
sprintf(buf, "GET /cgi-bin/set_h264?nr_h264_bandwidth=%d HTTP/1.0\r\nHost: %s\r\nAuthorization: Basic %s\r\n\r\n",
1024, in_ip[n], auth);
sendCoderCommand(buf, in_ip[n]);
sprintf(buf, "GET /cgi-bin/set_h264?nr_h264_quality=9 HTTP/1.0\r\nHost: %s\r\nAuthorization: Basic %s\r\n\r\n",
in_ip[n],auth);
sendCoderCommand(buf, in_ip[n]);
}
cerr << "Scream sender started "<<endl;
pthread_mutex_init(&lock_scream, NULL);
pthread_t tx_rtp_thread;
pthread_t rx_rtp_thread[MAX_SOURCES];
pthread_t rx_rtcp_thread;
pthread_t video_thread;
/* Create Transmit RTP thread */
pthread_create(&tx_rtp_thread,NULL,txRtpThread,"RTCP thread...");
cerr << "RX RTP thread(s) started" << endl;
/* Create Receive RTP thread(s) */
pthread_create(&rx_rtp_thread[0],NULL,rxRtpThread0,"RTP thread 0...");
if (nSources > 1)
pthread_create(&rx_rtp_thread[1],NULL,rxRtpThread1,"RTP thread 1...");
if (nSources > 2)
pthread_create(&rx_rtp_thread[2],NULL,rxRtpThread2,"RTP thread 2...");
if (nSources > 3)
pthread_create(&rx_rtp_thread[3],NULL,rxRtpThread3,"RTP thread 3...");
if (nSources > 4)
pthread_create(&rx_rtp_thread[4],NULL,rxRtpThread4,"RTP thread 4...");
if (nSources > 5)
pthread_create(&rx_rtp_thread[5],NULL,rxRtpThread5,"RTP thread 5...");
cerr << "RX RTP thread(s) started" << endl;
/* Create RTCP thread */
pthread_create(&rx_rtcp_thread,NULL,rxRtcpThread,"RTCP thread...");
cerr << "RTCP thread started" << endl;
/* Create Video control thread */
pthread_create(&video_thread, NULL, videoControlThread, "Video control thread...");
cerr << "Media control thread started" << endl;
while(!stopThread) {
uint64_t time_us = getTimeInUs()-t0;
if (time_us-lastLogT > 200000) {
char s[1000];
char s1[1000];
float time_s = (time_us)/1e6f;
screamTx->getShortLog(time_s, s1);
sprintf(s,"%8.3f, %s ", time_s, s1);
cout << s << endl;
/*
* Send statistics to receiver this can be used to
* verify reliability of remote control
*/
s1[0] = 0x80;
s1[1] = 0x7F; // Set PT = 0x7F for statistics packet
memcpy(&s1[2],s,strlen(s));
sendPacket(s1, strlen(s)+2);
/*
* Send SSRC map to receiver to enable
* correct mapping of cameras to displays
*/
s1[0] = 0x80;
s1[1] = 0x7E; // Set PT = 0x7E for SSRC map
for (int n=0; n < nSources; n++) {
/*
* Write the SSRCs (in network byte order)
*/
uint32_t tmp_l;
tmp_l = htonl(in_ssrc[n]);
memcpy(s1 + 2 + n*4, &tmp_l, 4);
}
sendPacket(s1, 2+nSources*4);
lastLogT = time_us;
}
usleep(10000);
};
usleep(500000);
close(fd_out_rtp);
for (int n = 0; n < nSources; n++)
close(fd_in_rtp[n]);
}
/*
* Lotsalotsa functions...
*/
/*
* Quantize table for Pansonic WV-SBV111M at 1280*960 resolution
*/
int panasonicRates[] = { 256, 384, 512, 768,1024,1536,2048,3072,4096,6144,8192};
int panasonicQuality[] = { 9, 9, 9, 7, 5, 3, 3, 3, 1, 1, 1};
int panasonicRatesN = 11;
/*
* Quantize the target bitrate to the closest value in a geometric sense
*/
int panasonicQuantizeRate(int rate) {
int ix = 0;
double minErr = 1e6;
while (rate > panasonicRates[ix+1])
ix++;
if (ix > 0) {
double r1 = panasonicRates[ix];
double r2 = panasonicRates[ix+1];
double d1 = (rate-r1)/(r2-r1);
double d2 = (r2-rate)/(r2-r1);
if (d1*4 > d2)
ix++;
}
return panasonicRates[ix];
}
/*
* Get the appropriate quality setting for the given target bitrate
*/
int panasonicGetQuality(int rate) {
for (int n=0; n < panasonicRatesN; n++) {
if (rate == panasonicRates[n])
return panasonicQuality[n];
}
}
/*
Extract the sequence number and the timestamp from the RTP header
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|V=2|P|X| CC |M| PT | sequence number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| timestamp |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| synchronization source (SSRC) identifier |
+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
| contributing source -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
void parseRtp(unsigned char *buf, uint16_t* seqNr, uint32_t* timeStamp, unsigned char *pt) {
uint16_t rawSeq;
uint32_t rawTs;
memcpy(&rawSeq, buf + 2, 2);
memcpy(&rawTs, buf + 4, 4);
memcpy(pt,buf+1,1);
*seqNr = ntohs(rawSeq);
*timeStamp = ntohl(rawTs);
}
/*
* Transmit a packet if possible.
* If not allowed due to packet pacing restrictions,
* then sleep
*/
void *txRtpThread(void *arg) {
int size;
uint16_t seqNr;
char buf[2000];
uint64_t time_us = getTimeInUs()-t0;
int sleepTime_us = 10;
float retVal = 0.0f;
int sizeOfQueue;
uint32_t ssrc;
for (;;) {
if (stopThread) {
return NULL;
}
time_us = getTimeInUs()-t0;
sleepTime_us = 10;
retVal = 0.0f;
/*
* Check if send window allows transmission and there is atleast one stream
* with RTP packets in queue
*/
pthread_mutex_lock(&lock_scream);
retVal = screamTx->isOkToTransmit(time_us, ssrc);
pthread_mutex_unlock(&lock_scream);
if (retVal != -1.0f) {
/*
* Send window allows transmission and atleast one stream has packets in RTP queue
* Get RTP queue for selected stream (ssrc)
*/
RtpQueue *rtpQueue = (RtpQueue*) screamTx->getStreamQueue(ssrc);
pthread_mutex_lock(&lock_rtp_queue);
sizeOfQueue = rtpQueue->sizeOfQueue();
pthread_mutex_unlock(&lock_rtp_queue);
do {
if (retVal == -1.0f) {
sizeOfQueue = 0;
} else {
if (retVal > 0.0f )
accumulatedPaceTime += retVal;
if (retVal != -1.0 && accumulatedPaceTime <= MIN_PACE_INTERVAL) {
/*
* Get RTP packet from the selected RTP queue
*/
pthread_mutex_lock(&lock_rtp_queue);
rtpQueue->pop(buf, size, seqNr);
pthread_mutex_unlock(&lock_rtp_queue);
/*
* Transmit RTP packet
*/
sendPacket(buf,size);
/*
* Register transmitted RTP packet
*/
pthread_mutex_lock(&lock_scream);
retVal = screamTx->addTransmitted(time_us, ssrc, size, seqNr);
pthread_mutex_unlock(&lock_scream);
}
/*
* Check if send window allows transmission and there is atleast one stream
* with RTP packets in queue
*/
retVal = screamTx->isOkToTransmit(time_us, ssrc);
if (retVal == -1.0f) {
/*
* Send window full or no packets in any RTP queue
*/
sizeOfQueue = 0;
} else {
/*
* Send window allows transmission and atleast one stream has packets in RTP queue
* Get RTP queue for selected stream (ssrc)
*/
rtpQueue = (RtpQueue*) screamTx->getStreamQueue(ssrc);
pthread_mutex_lock(&lock_rtp_queue);
sizeOfQueue = rtpQueue->sizeOfQueue();
pthread_mutex_unlock(&lock_rtp_queue);
}
}
} while (accumulatedPaceTime <= MIN_PACE_INTERVAL &&
retVal != -1.0f &&
sizeOfQueue > 0);
if (accumulatedPaceTime > 0) {
/*
* Sleep for a while, this paces out packets
*/
sleepTime_us = int (accumulatedPaceTime*1e6f);
accumulatedPaceTime = 0.0f;
}
}
usleep(sleepTime_us);
}
return NULL;
}
int recvRtp(unsigned char *buf_rtp, int ix) {
/*
* Wait for RTP packets from the coder
*/
int recvlen = recvfrom(fd_in_rtp[ix],
buf_rtp,
BUFSIZE,
0,
(struct sockaddr *)&in_rtp_addr[ix], &addrlen_in_rtp[ix]);
if (stopThread)
return 0;
return recvlen;
}
void processRtp(unsigned char *buf_rtp, int recvlen, int ix) {
uint64_t time_us = getTimeInUs();
time_us = getTimeInUs()-t0; // We need time in microseconds, roughly ms granularity is OK
uint16_t seqNr;
uint32_t ts;
unsigned char pt;
parseRtp(buf_rtp, &seqNr, &ts, &pt);
uint32_t pt_ = pt & 0x7F;
if ((pt & 0x7F)==PT) {
pthread_mutex_lock(&lock_rtp_queue);
rtpQueue[ix]->push(buf_rtp, recvlen, seqNr, (time_us)*1e-6f);
pthread_mutex_unlock(&lock_rtp_queue);
pthread_mutex_lock(&lock_scream);
screamTx->newMediaFrame(time_us, in_ssrc[ix], recvlen);
pthread_mutex_unlock(&lock_scream);
}
}
/*
* One thread for each media source (camera)
*/
void *rxRtpThread0(void *arg) {
unsigned char buf_rtp[BUFSIZE];
for (;;) {
int len = recvRtp(buf_rtp,0);
if (len > 0) {
processRtp(buf_rtp, len, 0);
}
}
return NULL;
}
void *rxRtpThread1(void *arg) {
unsigned char buf_rtp[BUFSIZE];
for (;;) {
int len = recvRtp(buf_rtp,1);
if (len > 0) {
processRtp(buf_rtp, len, 1);
}
}
return NULL;
}
void *rxRtpThread2(void *arg) {
unsigned char buf_rtp[BUFSIZE];
for (;;) {
int len = recvRtp(buf_rtp,2);
if (len > 0) {
processRtp(buf_rtp, len, 2);
}
}
return NULL;
}
void *rxRtpThread3(void *arg) {
unsigned char buf_rtp[BUFSIZE];
for (;;) {
int len = recvRtp(buf_rtp,3);
if (len > 0) {
processRtp(buf_rtp, len, 3);
}
}
return NULL;
}
void *rxRtpThread4(void *arg) {
unsigned char buf_rtp[BUFSIZE];
for (;;) {
int len = recvRtp(buf_rtp,4);
if (len > 0) {
pthread_mutex_lock(&lock_scream);
processRtp(buf_rtp, len, 4);
pthread_mutex_unlock(&lock_scream);
}
}
return NULL;
}
void *rxRtpThread5(void *arg) {
unsigned char buf_rtp[BUFSIZE];
for (;;) {
int len = recvRtp(buf_rtp,5);
if (len > 0) {
processRtp(buf_rtp, len, 5);
}
}
return NULL;
}
void *rxRtcpThread(void *arg) {
/*
* Wait for RTCP packets from receiver
*/
unsigned char buf_rtcp[BUFSIZE];
for (;;) {
int recvlen = recvfrom(fd_out_rtp, buf_rtcp, BUFSIZE, 0, (struct sockaddr *)&in_rtcp_addr, &addrlen_in_rtcp);
if (stopThread)
return;
uint64_t time_us = getTimeInUs()-t0; // We need time in microseconds, roughly ms granularity is OK
if (recvlen > KEEP_ALIVE_PKT_SIZE) {
pthread_mutex_lock(&lock_scream);
screamTx->incomingFeedback(time_us, buf_rtcp, recvlen);
pthread_mutex_unlock(&lock_scream);
}
}
return NULL;
}
int setup() {
for (int n=0; n < nSources; n++) {
in_rtp_addr[n].sin_family = AF_INET;
in_rtp_addr[n].sin_addr.s_addr = htonl(INADDR_ANY);
in_rtp_addr[n].sin_port = htons(in_port[n]);
if ((fd_in_rtp[n] = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
char s[100];
sprintf(s,"cannot create socket for incoming RTP media %d", n+1);
perror(s);
return 0;
}
if (bind(fd_in_rtp[n], (struct sockaddr *)&in_rtp_addr[n], sizeof(in_rtp_addr[n])) < 0) {
char s[100];
sprintf(s,"bind incoming_rtp_addr %d failed", n+1);
perror(s);
return 0;
} else{
cerr << "Listen on port " << in_port[n] << " to receive RTP media " << (n+1) << endl;
}
}
memset(&out_rtp_addr,0,sizeof(struct sockaddr_in));
out_rtp_addr.sin_family = AF_INET;
inet_aton(out_ip, (in_addr*)&out_rtp_addr.sin_addr.s_addr);
out_rtp_addr.sin_port = htons(out_port);
addrlen_out_rtp = sizeof(out_rtp_addr);
if ((fd_out_rtp = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
perror("cannot create socket for outgoing RTP media");
return 0;
}
/*
* Set send buf reasonably high to avoid socket blocking
*/
int sendBuff = 1000000;
int res = setsockopt(fd_out_rtp, SOL_SOCKET, SO_SNDBUF, &sendBuff, sizeof(sendBuff));
/*
* Set ECN capability for outgoing socket using IP_TOS
*/
#ifdef ECN_CAPABLE
int iptos = ect; // Check with wireshark
res = setsockopt(fd_out_rtp, IPPROTO_IP, IP_TOS, &iptos, sizeof(iptos));
if (res < 0) {
cerr << "Not possible to set ECN bits" << endl;
}
int tmp = 0;
res = getsockopt(fd_out_rtp, IPPROTO_IP, IP_TOS, &tmp, sizeof(tmp));
if (iptos == tmp) {
cerr << "ECN set successfully" << endl;
} else {
cerr << "ECN bits _not_ set successfully ? " << iptos << " " << tmp << endl;
}
#endif
/*
* Socket for incoming RTP media
*/
in_rtcp_addr.sin_family = AF_INET;
in_rtcp_addr.sin_port = htons(out_port);
in_rtcp_addr.sin_addr.s_addr = htonl(INADDR_ANY);
if (bind(fd_out_rtp, (struct sockaddr *)&in_rtcp_addr, sizeof(in_rtcp_addr)) < 0) {
perror("bind outgoing_rtp_addr failed");
return 0;
} else {
cerr<< "Listen on port "<< out_port <<" to receive RTCP from encoder "<<endl;
}
screamTx = new ScreamTx(congestionScaleFactor,
congestionScaleFactor,
delayTarget,
false,
1.0f,
10.0f,
12500,
false,
bytesInFlightHistSize,
false,
false);
for (int n=0; n < nSources; n++) {
rtpQueue[n] = new RtpQueue();
screamTx->registerNewStream(rtpQueue[n],
in_ssrc[n], priority[n],
256e3f, 1000e3f, maxRate, 500e5f,
0.5f, 0.1f, 0.05f,
congestionScaleFactor, congestionScaleFactor);
}
return 1;
}
/*
* Create socket to Video encoder
* for rate commands etc.
*/
int create_tcp_socket() {
int sock;
if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0){
cerr << "Can't create TCP socket" << endl;
exit(1);
}
return sock;
}
int setup_http(char *ip) {
http_addr.sin_family = AF_INET;
http_addr.sin_addr.s_addr = htonl(INADDR_ANY);
inet_aton(ip, (in_addr*)&http_addr.sin_addr.s_addr);
http_addr.sin_port = htons(80);
if (connect(http_sock, (struct sockaddr *)&http_addr, sizeof(struct sockaddr)) < 0){
cerr << "Could not connect to Video coder HTTP server " << ip << endl;
exit(1);
}
}
/*
* Send rate change request [bps]
*/
const void sendCoderCommand(char *buf, char *ip) {
http_sock = create_tcp_socket();
setup_http(ip);
//Send the query to the server
int sent = 0;
int tmpres = 0;
//cerr << "Send HTTP : " << buf << endl;
bool errSend = false;
/*
* Send HTTP GET
*/
while (sent < strlen(buf)) {
tmpres = send(http_sock, buf + sent, strlen(buf) - sent, 0);
if (tmpres == -1){
cerr << "Can't send HTTP GET" << endl;
errSend = true;
}
sent += tmpres;
}
if (true && !errSend) {
memset(buf, 0, sizeof(buf));
tmpres = recv(http_sock, buf, HTTP_BUF_SIZE, 0);
if (tmpres > 0) {
//cout << "HTTP response: " << buf << endl;
}
}
close(http_sock);
}
void *videoControlThread(void *arg) {
char buf[HTTP_BUF_SIZE];
while (!stopThread) {
for (int n=0; n < nSources; n++) {
/*
* Poll rate change for all media sources
*/
float rate = screamTx->getTargetBitrate(in_ssrc[n]);
if (rate > 0) {
int rateQ = (int)(std::min(8192.0f,rate/1000.0f)+0.5f);
rateQ = panasonicQuantizeRate(rateQ);
if (lastQuantRate[n] != rateQ) {
/*
* HTTP access to media coder is slow, send command only if rate is changed
*/
lastQuantRate[n] = rateQ;
sprintf(buf, "GET /cgi-bin/set_h264?nr_h264_bandwidth=%d HTTP/1.0\r\nHost: %s\r\nAuthorization: Basic %s\r\n\r\n",
rateQ, in_ip[n],auth);
sendCoderCommand(buf, in_ip[n]);
sprintf(buf, "GET /cgi-bin/set_h264?nr_h264_quality=%d HTTP/1.0\r\nHost: %s\r\nAuthorization: Basic %s\r\n\r\n",
panasonicGetQuality(rateQ), in_ip[n],auth);
sendCoderCommand(buf, in_ip[n]);
}
}
}
usleep(10000);
}
}
\ No newline at end of file
diff --git a/Laptop/sshPi b/Laptop/sshPi
new file mode 100755
index 0000000000000000000000000000000000000000..39faecd7bfb1b12fcf6cd5eb12f496a40d94df74
--- /dev/null
+++ b/Laptop/sshPi
@@ -0,0 +1 @@
+ssh pi@10.9.0.3
diff --git a/Laptop/startVPNClient.sh b/Laptop/startVPNClient.sh
new file mode 100755
index 0000000000000000000000000000000000000000..a42db227c56108a63f435fc9dfb619f56c60a1ef
--- /dev/null
+++ b/Laptop/startVPNClient.sh
@@ -0,0 +1,2 @@
+#!/bin/bash
+sudo systemctl start openvpn@client
diff --git a/Laptop/statusVPNClient.sh b/Laptop/statusVPNClient.sh
new file mode 100755
index 0000000000000000000000000000000000000000..146eb36ae278c82eb5d8b459294bfceb354b2785
--- /dev/null
+++ b/Laptop/statusVPNClient.sh
@@ -0,0 +1,2 @@
+#!/bin/bash
+sudo systemctl status openvpn@client
diff --git a/Laptop/stopVPNClient.sh b/Laptop/stopVPNClient.sh
new file mode 100755
index 0000000000000000000000000000000000000000..9e738882fd42a72c48160a3e63efdeabcb449991
--- /dev/null
+++ b/Laptop/stopVPNClient.sh
@@ -0,0 +1,2 @@
+#!/bin/bash
+sudo systemctl stop openvpn@client