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PyAudio

PyAudio provides Python bindings for PortAudio, the cross-platform audio I/O library. With PyAudio, you can easily use Python to play and record audio on a variety of platforms, such as GNU/Linux, Microsoft Windows, and Apple Mac OS X / macOS.

PyAudio is inspired by:

• pyPortAudio/fastaudio: Python bindings for PortAudio v18 API.
• tkSnack: cross-platform sound toolkit for Tcl/Tk and Python.

錯誤訊息

pi@raspberrypi:~  ipython3 
Python 3.5.3 (default, Jan 19 2017, 14:11:04) 
Type "copyright", "credits" or "license" for more information.

IPython 5.1.0 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object', use 'object??' for extra details.

In [1]: import pyaudio

In [2]: pyaudio.get_portaudio_version_text()
Out[2]: 'PortAudio V19.6.0-devel, revision 396fe4b6699ae929d3a685b3ef8a7e97396139a4'

In [3]: pyaudio.get_portaudio_version()
Out[3]: 1246720

In [4]: p = pyaudio.PyAudio()
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.front
...

In [5]: p.get_device_count()
Out[5]: 10

In [6]: p. get_default_input_device_info()
Out[6]: 
{'defaultHighInputLatency': 0.034829931972789115,
 'defaultHighOutputLatency': -1.0,
 'defaultLowInputLatency': 0.005804988662131519,
 'defaultLowOutputLatency': -1.0,
 'defaultSampleRate': 44100.0,
 'hostApi': 0,
 'index': 2,
 'maxInputChannels': 2,
 'maxOutputChannels': 0,
 'name': 'seeed-4mic-voicecard: - (hw:1,0)',
 'structVersion': 2}

In [7]: p.get_default_output_device_info()
Out[7]: 
{'defaultHighInputLatency': -1.0,
 'defaultHighOutputLatency': 0.034829931972789115,
 'defaultLowInputLatency': -1.0,
 'defaultLowOutputLatency': 0.005804988662131519,
 'defaultSampleRate': 44100.0,
 'hostApi': 0,
 'index': 8,
 'maxInputChannels': 0,
 'maxOutputChannels': 2,
 'name': 'default',
 'structVersion': 2}

In [8]: p.get_device_info_by_index(2)
Out[8]: 
{'defaultHighInputLatency': 0.034829931972789115,
 'defaultHighOutputLatency': -1.0,
 'defaultLowInputLatency': 0.005804988662131519,
 'defaultLowOutputLatency': -1.0,
 'defaultSampleRate': 44100.0,
 'hostApi': 0,
 'index': 2,
 'maxInputChannels': 2,
 'maxOutputChannels': 0,
 'name': 'seeed-4mic-voicecard: - (hw:1,0)',
 'structVersion': 2}

In [9]:

 

測試還請參考︰

Simple script to record sound from the microphone, dependencies: easy_install pyaudio