test_linuxaudiodev.py 文件源码

def test_play_sound_file(self):
        path = findfile("audiotest.au")
        fp = open(path, 'r')
        size, enc, rate, nchannels, extra = sunaudio.gethdr(fp)
        data = fp.read()
        fp.close()

        if enc != SND_FORMAT_MULAW_8:
            self.fail("Expect .au file with 8-bit mu-law samples")

        # convert the data to 16-bit signed
        data = audioop.ulaw2lin(data, 2)

        # set the data format
        if sys.byteorder == 'little':
            fmt = linuxaudiodev.AFMT_S16_LE
        else:
            fmt = linuxaudiodev.AFMT_S16_BE

        # set parameters based on .au file headers
        self.dev.setparameters(rate, 16, nchannels, fmt)
        self.dev.write(data)
        self.dev.flush()