pyjack-0.5.2/demos/just_capture.py

   1 #!/usr/bin/python
   2 # -*- coding: utf-8 -*-
   3 # Capture 3 seconds of stereo audio from alsa_pcm:capture_1/2; then play it back.
   4 #
   5 # Copyright 2003, Andrew W. Schmeder
   6 # This source code is released under the terms of the GNU Public License.
   7 # See LICENSE for the full text of these terms.
   8
   9 import numpy
  10 import jack
  11 import time
  12
  13 jack.attach("captest")
  14
  15 myname = jack.get_client_name()
  16 print "Client:", myname
  17 print "Jack ports (before):", jack.get_ports()
  18
  19 jack.register_port("in_1", jack.IsInput)
  20 jack.register_port("in_2", jack.IsInput)
  21
  22 jack.activate()
  23
  24 print "Jack ports (after):", jack.get_ports()
  25
  26 jack.connect("system:capture_1", myname+":in_1")
  27 jack.connect("system:capture_2", myname+":in_2")
  28
  29 print jack.get_connections(myname+":in_1")
  30
  31 N = jack.get_buffer_size()
  32 Sr = float(jack.get_sample_rate())
  33 print "Buffer Size:", N, "Sample Rate:", Sr
  34 sec = 3.0
  35
  36 capture = numpy.zeros((2,int(Sr*sec)), 'f')
  37 dummy = numpy.zeros((2,0), 'f')
  38
  39 #time.sleep(1)
  40
  41 print "Capturing audio..."
  42
  43 i = 0
  44 while i < capture.shape[1] - N:
  45     try:
  46         jack.process(dummy, capture[:,i:i+N])
  47         i += N
  48     except jack.InputSyncError:
  49         print "Input Sync"
  50         pass
  51     except jack.OutputSyncError:
  52         print "Output Sync"
  53         pass
  54     print ".",
  55
  56 print "\nPlaying back..."
  57
  58 jack.unregister_port("in_1")
  59 jack.unregister_port("in_2")
  60
  61 jack.deactivate()
  62
  63 jack.register_port("out_1", jack.IsOutput)
  64 jack.register_port("out_2", jack.IsOutput)
  65
  66 jack.activate()
  67
  68 jack.connect(myname+":out_1", "system:playback_1")
  69 jack.connect(myname+":out_2", "system:playback_2")
  70
  71 i = 0
  72 iS = 0
  73 oS = 0
  74 while i < capture.shape[1] - N:
  75     try:
  76         jack.process(capture[:,i:i+N], dummy)
  77         i += N
  78     except jack.InputSyncError:
  79         iS += 1
  80         pass
  81     except jack.OutputSyncError:
  82         oS += 1
  83         pass
  84 print "Finished with", iS, "input-off-sync &", oS, "output-off-sync"
  85
  86 jack.deactivate()
  87 jack.detach()
  88
  89 import numpy, scipy.io.wavfile
  90 toSave = numpy.array((2**15-1)*capture.transpose(),dtype="int16")
  91 scipy.io.wavfile.write("output.wav", int(Sr), toSave)