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