forked from auracaster/pyalsaaudio
dc68788ebf
r833 | casper | 2004-10-05 21:43:58 +0200 (Tue, 05 Oct 2004) | 1 line Completed mixer read/write support. Docs to follow git-svn-id: svn://svn.code.sf.net/p/pyalsaaudio/code/trunk@4 ec2f30ec-7544-0410-870e-f70ca00c83f0
46 lines
1.4 KiB
Python
46 lines
1.4 KiB
Python
## recordtest.py
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##
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## This is an example of a simple sound capture script.
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##
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## The script opens an ALSA pcm forsound capture. Set
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## various attributes of the capture, and reads in a loop,
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## writing the data to standard out.
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##
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## To test it out do the following:
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## python recordtest.py > out.raw # talk to the microphone
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## aplay -r 8000 -f S16_LE -c 1 out.raw
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import alsaaudio
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import sys
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import time
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# Open the device in nonblocking capture mode. The last argument could
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# just as well have been zero for blocking mode. Then we could have
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# left out the sleep call in the bottom of the loop
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inp = alsaaudio.PCM(alsaaudio.PCM_CAPTURE,alsaaudio.PCM_NONBLOCK)
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# Set attributes: Mono, 8000 Hz, 16 bit little endian samples
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inp.setchannels(1)
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inp.setrate(8000)
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inp.setformat(alsaaudio.PCM_FORMAT_S16_LE)
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# The period size controls the internal number of frames per period.
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# The significance of this parameter is documented in the ALSA api.
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# For our purposes, it is suficcient to know that reads from the device
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# will return this many frames. Each frame being 2 bytes long.
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# This means that the reads below will return either 320 bytes of data
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# or 0 bytes of data. The latter is possible because we are in nonblocking
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# mode.
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inp.setperiodsize(160)
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loops = 10000
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while loops > 0:
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loops -= 1
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# Read data from device
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l,data = inp.read()
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if l:
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# actual data read. Write it to stdout
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sys.stdout.write(data)
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time.sleep(.001)
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