1 """Classes for manipulating audio devices (currently only for Sun and SGI)"""
3 __all__ = ["error","AudioDev"]
5 class error(Exception):
9 # Private instance variables
10 ## if 0: access frameratelist, nchannelslist, sampwidthlist, oldparams, \
11 ## params, config, inited_outrate, inited_width, \
12 ## inited_nchannels, port, converter, classinited: private
15 frameratelist = nchannelslist = sampwidthlist = None
19 self.frameratelist = [
20 (48000, AL.RATE_48000),
21 (44100, AL.RATE_44100),
22 (32000, AL.RATE_32000),
23 (22050, AL.RATE_22050),
24 (16000, AL.RATE_16000),
25 (11025, AL.RATE_11025),
26 ( 8000, AL.RATE_8000),
28 self.nchannelslist = [
33 self.sampwidthlist = [
42 if not self.classinited:
45 self.params = [AL.OUTPUT_RATE, 0]
46 self.config = al.newconfig()
47 self.inited_outrate = 0
49 self.inited_nchannels = 0
59 al.setparams(AL.DEFAULT_DEVICE, self.oldparams)
66 while self.port.getfilled() > 0:
76 al.setparams(AL.DEFAULT_DEVICE, self.oldparams)
79 def setoutrate(self, rate):
80 for (raw, cooked) in self.frameratelist:
82 self.params[1] = cooked
83 self.inited_outrate = 1
86 raise error, 'bad output rate'
88 def setsampwidth(self, width):
89 for (raw, cooked) in self.sampwidthlist:
91 self.config.setwidth(cooked)
98 self.config.setwidth(AL.SAMPLE_16)
99 self.converter = self.ulaw2lin
101 raise error, 'bad sample width'
103 def setnchannels(self, nchannels):
104 for (raw, cooked) in self.nchannelslist:
106 self.config.setchannels(cooked)
107 self.inited_nchannels = 1
110 raise error, 'bad # of channels'
112 def writeframes(self, data):
113 if not (self.inited_outrate and self.inited_nchannels):
114 raise error, 'params not specified'
117 self.port = al.openport('Python', 'w', self.config)
118 self.oldparams = self.params[:]
119 al.getparams(AL.DEFAULT_DEVICE, self.oldparams)
120 al.setparams(AL.DEFAULT_DEVICE, self.params)
122 data = self.converter(data)
123 self.port.writesamps(data)
127 return self.port.getfilled()
131 def getfillable(self):
133 return self.port.getfillable()
135 return self.config.getqueuesize()
138 ## if 0: access *: private
140 def ulaw2lin(self, data):
142 return audioop.ulaw2lin(data, 2)
144 class Play_Audio_sun:
145 ## if 0: access outrate, sampwidth, nchannels, inited_outrate, inited_width, \
146 ## inited_nchannels, converter: private
152 self.inited_outrate = 0
153 self.inited_width = 0
154 self.inited_nchannels = 0
155 self.converter = None
162 def setoutrate(self, rate):
164 self.inited_outrate = 1
166 def setsampwidth(self, width):
167 self.sampwidth = width
168 self.inited_width = 1
170 def setnchannels(self, nchannels):
171 self.nchannels = nchannels
172 self.inited_nchannels = 1
174 def writeframes(self, data):
175 if not (self.inited_outrate and self.inited_width and self.inited_nchannels):
176 raise error, 'params not specified'
178 import sunaudiodev, SUNAUDIODEV
179 self.port = sunaudiodev.open('w')
180 info = self.port.getinfo()
181 info.o_sample_rate = self.outrate
182 info.o_channels = self.nchannels
183 if self.sampwidth == 0:
185 self.o_encoding = SUNAUDIODEV.ENCODING_ULAW
186 # XXX Hack, hack -- leave defaults
188 info.o_precision = 8 * self.sampwidth
189 info.o_encoding = SUNAUDIODEV.ENCODING_LINEAR
190 self.port.setinfo(info)
192 data = self.converter(data)
193 self.port.write(data)
209 return self.port.obufcount()
213 ## # Nobody remembers what this method does, and it's broken. :-(
214 ## def getfillable(self):
215 ## return BUFFERSIZE - self.getfilled()
218 # Dynamically try to import and use a platform specific module.
224 return Play_Audio_sun()
229 raise error, 'no audio device'
231 return Audio_mac.Play_Audio_mac()
233 return Play_Audio_sgi()
240 fn = 'f:just samples:just.aif'
242 af = aifc.open(fn, 'r')
243 print fn, af.getparams()
245 p.setoutrate(af.getframerate())
246 p.setsampwidth(af.getsampwidth())
247 p.setnchannels(af.getnchannels())
248 BUFSIZ = af.getframerate()/af.getsampwidth()/af.getnchannels()
250 data = af.readframes(BUFSIZ)
256 if __name__ == '__main__':