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"""Classes for manipulating audio devices (currently only for Sun and SGI)"""
__all__ = ["error","AudioDev"]
class error(Exception):
pass
class Play_Audio_sgi:
# Private instance variables
## if 0: access frameratelist, nchannelslist, sampwidthlist, oldparams, \
## params, config, inited_outrate, inited_width, \
## inited_nchannels, port, converter, classinited: private
classinited = 0
frameratelist = nchannelslist = sampwidthlist = None
def initclass(self):
import AL
self.frameratelist = [
(48000, AL.RATE_48000),
(44100, AL.RATE_44100),
(32000, AL.RATE_32000),
(22050, AL.RATE_22050),
(16000, AL.RATE_16000),
(11025, AL.RATE_11025),
( 8000, AL.RATE_8000),
]
self.nchannelslist = [
(1, AL.MONO),
(2, AL.STEREO),
(4, AL.QUADRO),
]
self.sampwidthlist = [
(1, AL.SAMPLE_8),
(2, AL.SAMPLE_16),
(3, AL.SAMPLE_24),
]
self.classinited = 1
def __init__(self):
import al, AL
if not self.classinited:
self.initclass()
self.oldparams = []
self.params = [AL.OUTPUT_RATE, 0]
self.config = al.newconfig()
self.inited_outrate = 0
self.inited_width = 0
self.inited_nchannels = 0
self.converter = None
self.port = None
return
def __del__(self):
if self.port:
self.stop()
if self.oldparams:
import al, AL
al.setparams(AL.DEFAULT_DEVICE, self.oldparams)
self.oldparams = []
def wait(self):
if not self.port:
return
import time
while self.port.getfilled() > 0:
time.sleep(0.1)
self.stop()
def stop(self):
if self.port:
self.port.closeport()
self.port = None
if self.oldparams:
import al, AL
al.setparams(AL.DEFAULT_DEVICE, self.oldparams)
self.oldparams = []
def setoutrate(self, rate):
for (raw, cooked) in self.frameratelist:
if rate == raw:
self.params[1] = cooked
self.inited_outrate = 1
break
else:
raise error, 'bad output rate'
def setsampwidth(self, width):
for (raw, cooked) in self.sampwidthlist:
if width == raw:
self.config.setwidth(cooked)
self.inited_width = 1
break
else:
if width == 0:
import AL
self.inited_width = 0
self.config.setwidth(AL.SAMPLE_16)
self.converter = self.ulaw2lin
else:
raise error, 'bad sample width'
def setnchannels(self, nchannels):
for (raw, cooked) in self.nchannelslist:
if nchannels == raw:
self.config.setchannels(cooked)
self.inited_nchannels = 1
break
else:
raise error, 'bad # of channels'
def writeframes(self, data):
if not (self.inited_outrate and self.inited_nchannels):
raise error, 'params not specified'
if not self.port:
import al, AL
self.port = al.openport('Python', 'w', self.config)
self.oldparams = self.params[:]
al.getparams(AL.DEFAULT_DEVICE, self.oldparams)
al.setparams(AL.DEFAULT_DEVICE, self.params)
if self.converter:
data = self.converter(data)
self.port.writesamps(data)
def getfilled(self):
if self.port:
return self.port.getfilled()
else:
return 0
def getfillable(self):
if self.port:
return self.port.getfillable()
else:
return self.config.getqueuesize()
# private methods
## if 0: access *: private
def ulaw2lin(self, data):
import audioop
return audioop.ulaw2lin(data, 2)
class Play_Audio_sun:
## if 0: access outrate, sampwidth, nchannels, inited_outrate, inited_width, \
## inited_nchannels, converter: private
def __init__(self):
self.outrate = 0
self.sampwidth = 0
self.nchannels = 0
self.inited_outrate = 0
self.inited_width = 0
self.inited_nchannels = 0
self.converter = None
self.port = None
return
def __del__(self):
self.stop()
def setoutrate(self, rate):
self.outrate = rate
self.inited_outrate = 1
def setsampwidth(self, width):
self.sampwidth = width
self.inited_width = 1
def setnchannels(self, nchannels):
self.nchannels = nchannels
self.inited_nchannels = 1
def writeframes(self, data):
if not (self.inited_outrate and self.inited_width and self.inited_nchannels):
raise error, 'params not specified'
if not self.port:
import sunaudiodev, SUNAUDIODEV
self.port = sunaudiodev.open('w')
info = self.port.getinfo()
info.o_sample_rate = self.outrate
info.o_channels = self.nchannels
if self.sampwidth == 0:
info.o_precision = 8
self.o_encoding = SUNAUDIODEV.ENCODING_ULAW
# XXX Hack, hack -- leave defaults
else:
info.o_precision = 8 * self.sampwidth
info.o_encoding = SUNAUDIODEV.ENCODING_LINEAR
self.port.setinfo(info)
if self.converter:
data = self.converter(data)
self.port.write(data)
def wait(self):
if not self.port:
return
self.port.drain()
self.stop()
def stop(self):
if self.port:
self.port.flush()
self.port.close()
self.port = None
def getfilled(self):
if self.port:
return self.port.obufcount()
else:
return 0
## # Nobody remembers what this method does, and it's broken. :-(
## def getfillable(self):
## return BUFFERSIZE - self.getfilled()
def AudioDev():
# Dynamically try to import and use a platform specific module.
try:
import al
except ImportError:
try:
import sunaudiodev
return Play_Audio_sun()
except ImportError:
try:
import Audio_mac
except ImportError:
raise error, 'no audio device'
else:
return Audio_mac.Play_Audio_mac()
else:
return Play_Audio_sgi()
def test(fn = None):
import sys
if sys.argv[1:]:
fn = sys.argv[1]
else:
fn = 'f:just samples:just.aif'
import aifc
af = aifc.open(fn, 'r')
print fn, af.getparams()
p = AudioDev()
p.setoutrate(af.getframerate())
p.setsampwidth(af.getsampwidth())
p.setnchannels(af.getnchannels())
BUFSIZ = af.getframerate()/af.getsampwidth()/af.getnchannels()
while 1:
data = af.readframes(BUFSIZ)
if not data: break
print len(data)
p.writeframes(data)
p.wait()
if __name__ == '__main__':
test()
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