EdgeEngine.get_stream_info() is not right

[minghf85]

In TextToAudioStream, when the engine is edge,format equals 66536, which is not right, please repair

    def _on_audio_chunk(self, chunk):
        """
        Postprocessing of single chunks of audio data.
        This method is called for each chunk of audio data processed. It first determines the audio stream format.
        If the format is `pyaudio.paFloat32`, we convert to paInt16.

        Args:
            chunk (bytes): The audio data chunk to be processed.
        """
        format, channels, sample_rate = self.engine.get_stream_info()

        if format == pyaudio.paFloat32:
            audio_data = np.frombuffer(chunk, dtype=np.float32)
            audio_data = np.int16(audio_data * 32767)
            chunk = audio_data.tobytes()
        else:
            # For other formats, convert to numpy array for RMS calculation
            audio_data = np.frombuffer(chunk, dtype=np.int16)
        
        # Calculate RMS value for lip sync
        if len(audio_data) > 0:
            # Normalize to float32 for RMS calculation
            if format == pyaudio.paFloat32:
                # audio_data is already converted above
                normalized_data = audio_data.astype(np.float32) / 32767.0
            else:
                # For int16 format
                normalized_data = audio_data.astype(np.float32) / 32767.0
            
            # Calculate RMS
            self.current_rms = np.sqrt(np.mean(np.square(normalized_data)))
        else:
            self.current_rms = 0.0

        if self.output_wavfile and self.wf:
            if self._is_engine_mpeg():
                self.wf.write(chunk)
            else:
                self.wf.writeframes(chunk)

        if self.chunk_callback:
            self.chunk_callback(chunk)