diff options
| -rw-r--r-- | Lib/audiodev.py | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/Lib/audiodev.py b/Lib/audiodev.py new file mode 100644 index 0000000..d0dcfed --- /dev/null +++ b/Lib/audiodev.py @@ -0,0 +1,205 @@ +import AL, SUNAUDIODEV + +error = 'audiodev.error' + +class Play_Audio_sgi: + # Private instance variables + access frameratelist, nchannelslist, sampwidthlist, oldparams, \ + params, config, inited_outrate, inited_width, \ + inited_nchannels, port, converter: private + + 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)] + nchannelslist = [(1, AL.MONO), + (2, AL.STEREO)] + sampwidthlist = [(1, AL.SAMPLE_8), + (2, AL.SAMPLE_16), + (3, AL.SAMPLE_24)] + + def __init__(self): + import al + 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.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.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: + 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 + 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 + access *: private + + def ulaw2lin(self, data): + import audioop + return audioop.ulaw2lin(data, 2) + +class Play_Audio_sun: + 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 + 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 = ENCODING_ULAW + 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 + + def getfillable(self): + return BUFFERSIZE - self.getfilled() + +def AudioDev(): + try: + import al + return Play_Audio_sgi() + except ImportError: + try: + import sunaudiodev + return Play_Audio_sun() + except ImportError: + raise error, 'no audio device' |