python/demos/demo_pysoundcard_record.py

   1 #! /usr/bin/env python
   2
   3 def record_sink(sink_path):
   4     """Record an audio file using pysoundcard."""
   5
   6     from aubio import sink
   7     from pysoundcard import Stream
   8
   9     hop_size = 256
  10     duration = 5 # in seconds
  11     s = Stream(blocksize = hop_size, channels = 1)
  12     g = sink(sink_path, samplerate = int(s.samplerate))
  13
  14     s.start()
  15     total_frames = 0
  16     try:
  17         while total_frames < duration * s.samplerate:
  18             vec = s.read(hop_size)
  19             # mix down to mono
  20             mono_vec = vec.sum(-1) / float(s.channels[0])
  21             g(mono_vec, hop_size)
  22             total_frames += hop_size
  23     except KeyboardInterrupt:
  24         duration = total_frames / float(s.samplerate)
  25         print("stopped after %.2f seconds" % duration)
  26     s.stop()
  27
  28 if __name__ == '__main__':
  29     import sys
  30     record_sink(sys.argv[1])