Initial revision

Demo/sgi/video/syncaudio.py

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+import AL
+import al
+import sys
+import vtime
+import socket
+import time
+
+
+SLEEPTIME = 500		# 500 ms sleeps
+SAMPLEFREQ = 16000	# 16Khz samples
+SAMPLERATE = AL.RATE_16000
+NEEDBUFFERED = SAMPLEFREQ	# Buffer 1 second of sound
+BUFFERSIZE = NEEDBUFFERED*4	# setqueuesize() par for 2 second sound
+
+AVSYNCPORT = 10000	# Port for time syncing
+AVCTLPORT = 10001	# Port for record start/stop
+
+def main():
+    if len(sys.argv) <> 3:
+	print 'Usage: ', sys.argv[0], 'videohostname soundfile'
+	sys.exit(1)
+    #
+    ofile = open(sys.argv[2], 'w')
+    #
+    globaltime = vtime.VTime().init(0,sys.argv[1],AVSYNCPORT)
+    #
+    ctl = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
+    ctl.bind((socket.gethostname(),AVCTLPORT))
+    #
+    inp = openmic()
+    #
+    out = 0		# Open aiff file
+    #
+    while 1:
+	if mainloop(None, ctl, inp, out, globaltime):
+	    break
+	if mainloop(ofile, ctl, inp, out, globaltime):
+	    break
+    pass	# Close aiff file
+    sys.exit(0)
+#
+def openmic():
+    conf = al.newconfig()
+    conf.setqueuesize(BUFFERSIZE)
+    conf.setwidth(AL.SAMPLE_16)
+    conf.setchannels(AL.MONO)
+    return al.openport('micr','r',conf)
+#
+def mainloop(ofile, ctl, inp, out, globaltime):
+    #
+    # Wait for sync packet, keeping 1-2 seconds of sound in the
+    # buffer
+    #
+    totsamps = 0
+    totbytes = 0
+    starttime = time.millitimer()
+    while 1:
+	time.millisleep(SLEEPTIME)
+	if ctl.avail():
+	    break
+	nsamples = inp.getfilled()-NEEDBUFFERED
+	if nsamples>0:
+	    data = inp.readsamps(nsamples)
+	    totsamps = totsamps + nsamples
+	    totbytes = totbytes + len(data)
+	    if ofile <> None:
+		ofile.write(data)
+    #
+    # Compute his starttime and the timestamp of the first byte in the
+    # buffer. Discard all buffered data upto his starttime
+    #
+    startstop,histime = eval(ctl.recv(100))
+    if (ofile = None and startstop = 0) or \
+			   (ofile <> None and startstop = 1):
+	print 'Sync error: saving=',save,' request=',startstop
+	sys.exit(1)
+    filllevel = inp.getfilled()
+    filltime = time.millitimer()
+    filltime = filltime - filllevel / (SAMPLEFREQ/1000)
+    starttime = globaltime.his2mine(histime)
+    nsamples = starttime - filltime
+    if nsamples < 0:
+	print 'Start/stop signal came too late'
+	sys.exit(1)
+    nsamples = nsamples * (SAMPLEFREQ / 1000)
+    data = inp.readsamps(nsamples)
+    totsamps = totsamps + nsamples
+    totbytes = totbytes + len(data)
+    print 'Time: ', time.millitimer()-starttime, ', Bytes: ', totbytes, ', Samples: ', totsamps
+    if ofile <> None:
+	ofile.write(data)
+    return (startstop = 2)
+
+main()