python/demos/demo_pyaudio.py: added simple demo for pyaudio, see #6, closes #78,...
[aubio.git] / python / demos / demo_pyaudio.py
1 #! /usr/bin/env python
2
3 import pyaudio
4 import sys
5 import numpy as np
6 from aubio import pitch, sink
7
8 # initialise pyaudio
9 p = pyaudio.PyAudio()
10
11 # open stream
12 buffer_size = 1024
13 pyaudio_format = pyaudio.paFloat32
14 n_channels = 1
15 samplerate = 44100
16 stream = p.open(format=pyaudio_format,
17                 channels=n_channels,
18                 rate=samplerate,
19                 input=True,
20                 frames_per_buffer=buffer_size)
21
22 if len(sys.argv) > 1:
23     # record 5 seconds
24     output_filename = sys.argv[1]
25     record_duration = 5 # exit 1
26     outputsink = sink(sys.argv[1], samplerate)
27     total_frames = 0
28 else:
29     # run forever
30     outputsink = None
31     record_duration = None
32
33 # setup pitch
34 tolerance = 0.8
35 win_s = 4096 # fft size
36 hop_s = buffer_size # hop size
37 pitch_o = pitch("default", win_s, hop_s, samplerate)
38 pitch_o.set_unit("midi")
39 pitch_o.set_tolerance(tolerance)
40
41 print("*** starting recording")
42 while True:
43     try:
44         audiobuffer = stream.read(buffer_size)
45         signal = np.fromstring(audiobuffer, dtype=np.float32)
46
47         pitch = pitch_o(signal)[0]
48         confidence = pitch_o.get_confidence()
49
50         print("{} / {}".format(pitch,confidence))
51
52         if outputsink:
53             outputsink(signal, len(signal))
54
55         if record_duration:
56             total_frames += len(signal)
57             if record_duration * samplerate < total_frames:
58                 break
59     except KeyboardInterrupt:
60         print("*** Ctrl+C pressed, exiting")
61         break
62
63 print("*** done recording")
64 stream.stop_stream()
65 stream.close()
66 p.terminate()