Audio_mac.py 文件源码

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)