forked from auracaster/pyalsaaudio
fc3517b00e
3) git-svn-id: svn://svn.code.sf.net/p/pyalsaaudio/code/trunk@29 ec2f30ec-7544-0410-870e-f70ca00c83f0
62 lines
1.5 KiB
Python
Executable File
62 lines
1.5 KiB
Python
Executable File
#!/usr/bin/env python
|
|
|
|
## playbacktest.py
|
|
##
|
|
## This is an example of a simple sound playback script.
|
|
##
|
|
## The script opens an ALSA pcm for sound playback. Set
|
|
## various attributes of the device. It then reads data
|
|
## from stdin and writes it to the device.
|
|
##
|
|
## To test it out do the following:
|
|
## python recordtest.py out.raw # talk to the microphone
|
|
## python playbacktest.py out.raw
|
|
|
|
|
|
# Footnote: I'd normally use print instead of sys.std(out|err).write,
|
|
# but we're in the middle of the conversion between python 2 and 3
|
|
# and this code runs on both versions without conversion
|
|
|
|
import sys
|
|
import time
|
|
import getopt
|
|
import alsaaudio
|
|
|
|
def usage():
|
|
sys.stderr.write('usage: playbacktest.py [-c <card>] <file>\n')
|
|
sys.exit(2)
|
|
|
|
if __name__ == '__main__':
|
|
|
|
card = 'default'
|
|
|
|
opts, args = getopt.getopt(sys.argv[1:], 'c:')
|
|
for o, a in opts:
|
|
if o == '-c':
|
|
card = a
|
|
|
|
if not args:
|
|
usage()
|
|
|
|
f = open(args[0], 'rb')
|
|
|
|
# Open the device in playback mode.
|
|
out = alsaaudio.PCM(alsaaudio.PCM_PLAYBACK, card=card)
|
|
|
|
# Set attributes: Mono, 44100 Hz, 16 bit little endian frames
|
|
out.setchannels(1)
|
|
out.setrate(44100)
|
|
out.setformat(alsaaudio.PCM_FORMAT_S16_LE)
|
|
|
|
# The period size controls the internal number of frames per period.
|
|
# The significance of this parameter is documented in the ALSA api.
|
|
out.setperiodsize(160)
|
|
|
|
# Read data from stdin
|
|
data = f.read(320)
|
|
while data:
|
|
out.write(data)
|
|
data = f.read(320)
|
|
|
|
|