cpython/Demo/sgi/cd/playcd.py

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# Read CD audio data from the SCSI bus and play it back over the
# built-in speaker or audio jack.
import sys
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import al
import AL
import cd
import CD
def playaudio(port, type, audio):
## print 'playaudio'
port.writesamps(audio)
callbacks = ['audio', 'pnum', 'index', 'ptime', 'atime', 'catalog', 'ident', 'control']
def callback(port, type, data):
print 'type', callbacks[type], 'data', `data`
Error = 'playcd.error'
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def main():
player = cd.open()
parser = cd.createparser()
state, track, (min, sec, frame), (abs_min, abs_sec, abs_frame), \
(total_min, total_sec, total_frame), \
first, last, scsi_audio, \
cur_block, (dum1, dum2, dum3) = player.getstatus()
print state, track, (min, sec, frame), \
(abs_min, abs_sec, abs_frame), \
(total_min, total_sec, total_frame), \
first, last, scsi_audio, \
cur_block, (dum1, dum2, dum3)
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if state <> CD.READY:
player.close()
raise Error, 'CD not ready'
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if not scsi_audio:
player.close()
raise Error, 'not an audio-capable CD-ROM player'
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for i in range(first, last+1):
trackinfo = player.gettrackinfo(i)
print 'Track', i, trackinfo
if sys.argv[1:]:
print 'Start at track', sys.argv[1]
player.seektrack(eval(sys.argv[1]))
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size = player.bestreadsize()
oldparams = [AL.OUTPUT_RATE, 0]
params = oldparams[:]
al.getparams(AL.DEFAULT_DEVICE, oldparams)
params[1] = AL.RATE_44100
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try:
al.setparams(AL.DEFAULT_DEVICE, params)
config = al.newconfig()
config.setwidth(AL.SAMPLE_16)
config.setchannels(AL.STEREO)
port = al.openport('CD Player', 'w', config)
parser.setcallback(CD.AUDIO, playaudio, port)
for i in range(1, 8):
parser.setcallback(i, callback, port)
parser.removecallback(CD.ATIME)
parser.removecallback(CD.PTIME)
while 1:
frames = player.readda(size)
if frames == '':
break
parser.parseframe(frames)
except KeyboardInterrupt:
pass
al.setparams(AL.DEFAULT_DEVICE, oldparams)
player.close()
parser.deleteparser()
main()