Lib/plat-mac/Audio_mac.py

   1 QSIZE = 100000
   2 error='Audio_mac.error'
   3
   4 from warnings import warnpy3k
   5 warnpy3k("In 3.x, the Play_Audio_mac module is removed.", stacklevel=2)
   6
   7 class Play_Audio_mac:
   8
   9     def __init__(self, qsize=QSIZE):
  10         self._chan = None
  11         self._qsize = qsize
  12         self._outrate = 22254
  13         self._sampwidth = 1
  14         self._nchannels = 1
  15         self._gc = []
  16         self._usercallback = None
  17
  18     def __del__(self):
  19         self.stop()
  20         self._usercallback = None
  21
  22     def wait(self):
  23         import time
  24         while self.getfilled():
  25             time.sleep(0.1)
  26         self._chan = None
  27         self._gc = []
  28
  29     def stop(self, quietNow = 1):
  30         ##chan = self._chan
  31         self._chan = None
  32         ##chan.SndDisposeChannel(1)
  33         self._gc = []
  34
  35     def setoutrate(self, outrate):
  36         self._outrate = outrate
  37
  38     def setsampwidth(self, sampwidth):
  39         self._sampwidth = sampwidth
  40
  41     def setnchannels(self, nchannels):
  42         self._nchannels = nchannels
  43
  44     def writeframes(self, data):
  45         import time
  46         from Carbon.Sound import bufferCmd, callBackCmd, extSH
  47         import struct
  48         import MacOS
  49         if not self._chan:
  50             from Carbon import Snd
  51             self._chan = Snd.SndNewChannel(5, 0, self._callback)
  52         nframes = len(data) / self._nchannels / self._sampwidth
  53         if len(data) != nframes * self._nchannels * self._sampwidth:
  54             raise error, 'data is not a whole number of frames'
  55         while self._gc and \
  56               self.getfilled() + nframes > \
  57                 self._qsize / self._nchannels / self._sampwidth:
  58             time.sleep(0.1)
  59         if self._sampwidth == 1:
  60             import audioop
  61             data = audioop.add(data, '\x80'*len(data), 1)
  62         h1 = struct.pack('llHhllbbl',
  63             id(data)+MacOS.string_id_to_buffer,
  64             self._nchannels,
  65             self._outrate, 0,
  66             0,
  67             0,
  68             extSH,
  69             60,
  70             nframes)
  71         h2 = 22*'\0'
  72         h3 = struct.pack('hhlll',
  73             self._sampwidth*8,
  74             0,
  75             0,
  76             0,
  77             0)
  78         header = h1+h2+h3
  79         self._gc.append((header, data))
  80         self._chan.SndDoCommand((bufferCmd, 0, header), 0)
  81         self._chan.SndDoCommand((callBackCmd, 0, 0), 0)
  82
  83     def _callback(self, *args):
  84         del self._gc[0]
  85         if self._usercallback:
  86             self._usercallback()
  87
  88     def setcallback(self, callback):
  89         self._usercallback = callback
  90
  91     def getfilled(self):
  92         filled = 0
  93         for header, data in self._gc:
  94             filled = filled + len(data)
  95         return filled / self._nchannels / self._sampwidth
  96
  97     def getfillable(self):
  98         return (self._qsize / self._nchannels / self._sampwidth) - self.getfilled()
  99
 100     def ulaw2lin(self, data):
 101         import audioop
 102         return audioop.ulaw2lin(data, 2)
 103
 104 def test():
 105     import aifc
 106     import EasyDialogs
 107     fn = EasyDialogs.AskFileForOpen(message="Select an AIFF soundfile", typeList=("AIFF",))
 108     if not fn: return
 109     af = aifc.open(fn, 'r')
 110     print af.getparams()
 111     p = Play_Audio_mac()
 112     p.setoutrate(af.getframerate())
 113     p.setsampwidth(af.getsampwidth())
 114     p.setnchannels(af.getnchannels())
 115     BUFSIZ = 10000
 116     while 1:
 117         data = af.readframes(BUFSIZ)
 118         if not data: break
 119         p.writeframes(data)
 120         print 'wrote', len(data), 'space', p.getfillable()
 121     p.wait()
 122
 123 if __name__ == '__main__':
 124     test()