mic.py 文件源码

def _write_frames_to_file(self, frames, framerate, volume):
        with tempfile.NamedTemporaryFile(mode='w+b') as f:
            wav_fp = wave.open(f, 'wb')
            wav_fp.setnchannels(self._input_channels)
            wav_fp.setsampwidth(int(self._input_bits / 8))
            wav_fp.setframerate(framerate)
            if self._input_rate == framerate:
                fragment = ''.join(frames)
            else:
                fragment = audioop.ratecv(''.join(frames),
                                          int(self._input_bits / 8),
                                          self._input_channels,
                                          self._input_rate,
                                          framerate, None)[0]
            if volume is not None:
                maxvolume = audioop.minmax(fragment, self._input_bits / 8)[1]
                fragment = audioop.mul(
                    fragment, int(self._input_bits / 8),
                    volume * (2. ** 15) / maxvolume)

            wav_fp.writeframes(fragment)
            wav_fp.close()
            f.seek(0)
            yield f