Java Code Examples for android.media.AudioRecord#setPositionNotificationPeriod()

private void initRecorder() {
    final int bufferSize = 2 * AudioRecord.getMinBufferSize(RECORDER_SAMPLE_RATE,
            RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING);
    audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, RECORDER_SAMPLE_RATE,
            RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING, bufferSize);
    AudioUtil.initProcessor(RECORDER_SAMPLE_RATE, RECORDER_CHANNELS, RECORDER_ENCODING_BIT);

    recordingThread = new Thread("recorder") {
        @Override
        public void run() {
            super.run();
            buffer = new byte[bufferSize];
            Looper.prepare();
            audioRecord.setRecordPositionUpdateListener(recordPositionUpdateListener, new Handler(Looper.myLooper()));
            int bytePerSample = RECORDER_ENCODING_BIT / 8;
            float samplesToDraw = bufferSize / bytePerSample;
            audioRecord.setPositionNotificationPeriod((int) samplesToDraw);
            //We need to read first chunk to motivate recordPositionUpdateListener.
            //Mostly, for lower versions - https://code.google.com/p/android/issues/detail?id=53996
            audioRecord.read(buffer, 0, bufferSize);
            Looper.loop();
        }
    };
}
 

private void initRecorder() {
    final int bufferSize = 2 * AudioRecord.getMinBufferSize(RECORDER_SAMPLE_RATE,
            RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING);
    audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, RECORDER_SAMPLE_RATE,
            RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING, bufferSize);
    AudioUtil.initProcessor(RECORDER_SAMPLE_RATE, RECORDER_CHANNELS, RECORDER_ENCODING_BIT);

    recordingThread = new Thread("recorder") {
        @Override
        public void run() {
            super.run();
            buffer = new byte[bufferSize];
            Looper.prepare();
            audioRecord.setRecordPositionUpdateListener(recordPositionUpdateListener, new Handler(Looper.myLooper()));
            int bytePerSample = RECORDER_ENCODING_BIT / 8;
            float samplesToDraw = bufferSize / bytePerSample;
            audioRecord.setPositionNotificationPeriod((int) samplesToDraw);
            //We need to read first chunk to motivate recordPositionUpdateListener.
            //Mostly, for lower versions - https://code.google.com/p/android/issues/detail?id=53996
            audioRecord.read(buffer, 0, bufferSize);
            Looper.loop();
        }
    };
}
 

/**
   * Initialize audio recorder
   */
  private void initAudioRecorder() throws IOException {
      mBufferSize = AudioRecord.getMinBufferSize(DEFAULT_SAMPLING_RATE,
              DEFAULT_CHANNEL_CONFIG, DEFAULT_AUDIO_FORMAT.getAudioFormat());

      int bytesPerFrame = DEFAULT_AUDIO_FORMAT.getBytesPerFrame();
      /* Get number of samples. Calculate the buffer size
       * (round up to the factor of given frame size)
 * 使能被整除，方便下面的周期性通知
 * */
      int frameSize = mBufferSize / bytesPerFrame;
      if (frameSize % FRAME_COUNT != 0) {
          frameSize += (FRAME_COUNT - frameSize % FRAME_COUNT);
          mBufferSize = frameSize * bytesPerFrame;
      }

/* Setup audio recorder */
      mAudioRecord = new AudioRecord(DEFAULT_AUDIO_SOURCE,
              DEFAULT_SAMPLING_RATE, DEFAULT_CHANNEL_CONFIG, DEFAULT_AUDIO_FORMAT.getAudioFormat(),
              mBufferSize);

      mPCMBuffer = new short[mBufferSize];
      /*
       * Initialize lame buffer
 * mp3 sampling rate is the same as the recorded pcm sampling rate 
 * The bit rate is 32kbps
 * 
 */
      LameUtil.init(DEFAULT_SAMPLING_RATE, DEFAULT_LAME_IN_CHANNEL, DEFAULT_SAMPLING_RATE, DEFAULT_LAME_MP3_BIT_RATE, DEFAULT_LAME_MP3_QUALITY);
      // Create and run thread used to encode data
      // The thread will
      mEncodeThread = new DataEncodeThread(mRecordFile, mBufferSize);
      mEncodeThread.start();
      mAudioRecord.setRecordPositionUpdateListener(mEncodeThread, mEncodeThread.getHandler());
      mAudioRecord.setPositionNotificationPeriod(FRAME_COUNT);
  }
 

/**
   * Initialize audio recorder
   */
  private void initAudioRecorder() throws IOException {
      int bytesPerFrame = audioFormat.getBytesPerFrame();
      /* Get number of samples. Calculate the buffer size (round up to the
         factor of given frame size) */
      int frameSize = AudioRecord.getMinBufferSize(samplingRate,
              channelConfig, audioFormat.getAudioFormat()) / bytesPerFrame;
      if (frameSize % FRAME_COUNT != 0) {
          frameSize = frameSize + (FRAME_COUNT - frameSize % FRAME_COUNT);
          Log.d(TAG, "Frame size: " + frameSize);
      }

      bufferSize = frameSize * bytesPerFrame;

/* Setup audio recorder */
      audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC,
              samplingRate, channelConfig, audioFormat.getAudioFormat(),
              bufferSize);

      // Setup RingBuffer. Currently is 10 times size of hardware buffer
      // Initialize buffer to hold data
      ringBuffer = new RingBuffer(10 * bufferSize);
      buffer = new byte[bufferSize];

      // Initialize lame buffer
      // mp3 sampling rate is the same as the recorded pcm sampling rate
      // The bit rate is 32kbps
      SimpleLame.init(samplingRate, 1, samplingRate, BIT_RATE);

      if (TextUtils.isEmpty(audioOutputPath)) {
          throw new NullPointerException("please set the audio output path!");
      }
      mp3File = new File(audioOutputPath);
      os = new FileOutputStream(mp3File);

      // Create and run thread used to encode data
      // The thread will
      encodeThread = new DataEncodeThread(ringBuffer, os, bufferSize);
      encodeThread.start();
      audioRecord.setRecordPositionUpdateListener(encodeThread, encodeThread.getHandler());
      audioRecord.setPositionNotificationPeriod(FRAME_COUNT);
  }