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QSIZE = 100000
error='Audio_mac.error'
class Play_Audio_mac:
def __init__(self, qsize=QSIZE):
self._chan = None
self._qsize = qsize
self._outrate = 22254
self._sampwidth = 1
self._nchannels = 1
self._gc = []
self._usercallback = None
def __del__(self):
self.stop()
self._usercallback = None
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 Carbon.Sound import bufferCmd, callBackCmd, extSH
import struct
import MacOS
if not self._chan:
from Carbon 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 error, '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)+MacOS.string_id_to_buffer,
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]
if self._usercallback:
self._usercallback()
def setcallback(self, callback):
self._usercallback = callback
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._nchannels / self._sampwidth) - self.getfilled()
def ulaw2lin(self, data):
import audioop
return audioop.ulaw2lin(data, 2)
def test():
import aifc
import macfs
fss, ok = macfs.PromptGetFile("Select an AIFF soundfile", "AIFF")
if not ok: return
fn = fss.as_pathname()
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)
print 'wrote', len(data), 'space', p.getfillable()
p.wait()
if __name__ == '__main__':
test()
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