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QSIZE = 100000
class Play_Audio_mac:
def __init__(self):
self._chan = None
self._qsize = QSIZE
self._outrate = 22254
self._sampwidth = 1
self._nchannels = 1
self._gc = []
def __del__(self):
self.stop()
def wait(self):
import time
while self.getfilled():
time.sleep(0.1)
self._chan = None
self._gc = []
def stop(self, quietNow = 1):
##chan = self._chan
self._chan = None
##chan.SndDisposeChannel(1)
self._gc = []
def setoutrate(self, outrate):
self._outrate = outrate
def setsampwidth(self, sampwidth):
self._sampwidth = sampwidth
def setnchannels(self, nchannels):
self._nchannels = nchannels
def writeframes(self, data):
import time
from Sound import *
import struct
if not self._chan:
import Snd
self._chan = Snd.SndNewChannel(5, 0, self._callback)
nframes = len(data) / self._nchannels / self._sampwidth
if len(data) != nframes * self._nchannels * self._sampwidth:
raise ValueError, 'data is not a whole number of frames'
while self._gc and \
self.getfilled() + nframes > \
self._qsize / self._nchannels / self._sampwidth:
time.sleep(0.1)
if self._sampwidth == 1:
import audioop
data = audioop.add(data, '\x80'*len(data), 1)
h1 = struct.pack('llhhllbbl',
id(data)+12,
self._nchannels,
self._outrate, 0,
0,
0,
extSH,
60,
nframes)
h2 = 22*'\0'
h3 = struct.pack('hhlll',
self._sampwidth*8,
0,
0,
0,
0)
header = h1+h2+h3
self._gc.append((header, data))
self._chan.SndDoCommand((bufferCmd, 0, header), 0)
self._chan.SndDoCommand((callBackCmd, 0, 0), 0)
def _callback(self, *args):
del self._gc[0]
def getfilled(self):
filled = 0
for header, data in self._gc:
filled = filled + len(data)
return filled / self._nchannels / self._sampwidth
def getfillable(self):
return self._qsize - self.getfilled()
def ulaw2lin(self, data):
import audioop
return audioop.ulaw2lin(data, 2)
def test(fn = 'f:just samples:just.aif'):
import aifc
af = aifc.open(fn, 'r')
print af.getparams()
p = Play_Audio_mac()
p.setoutrate(af.getframerate())
p.setsampwidth(af.getsampwidth())
p.setnchannels(af.getnchannels())
BUFSIZ = 10000
while 1:
data = af.readframes(BUFSIZ)
if not data: break
p.writeframes(data)
p.wait()
if __name__ == '__main__':
test()
|
