Android Open Source - android_bluetooth Demo Util

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License

The source code is released under:

MIT License

Java Source Code

package com.smartdevices.smartqwatchdemo;
// w  ww . j  a  v  a  2 s .  c o  m
import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioRecord;
import android.media.AudioTrack;
import android.media.MediaRecorder.AudioSource;
import android.util.Log;

public class DemoUtil {
  private static final String TAG="DemoUtil";
  public static final String KEY_RECORD_DATA = "record_data";
  public static final String KEY_CONNECT = "start_connect";
  
  private static int[] mSampleRates = new int[] { 8000, 11025, 22050, 44100 };
  public static int gBufferSize = -1;
  
  public static  AudioRecord findAudioRecord() {
    for (int rate : mSampleRates) {
      for (short audioFormat : new short[] {
          AudioFormat.ENCODING_PCM_8BIT,
          AudioFormat.ENCODING_PCM_16BIT }) {
        for (short channelConfig : new short[] {
            AudioFormat.CHANNEL_IN_STEREO,
            AudioFormat.CHANNEL_IN_MONO }) {
          try {
            int bufferSize = AudioRecord.getMinBufferSize(rate,
                channelConfig, audioFormat);

            Log.d(TAG, "findAudioRecord:Attempting rate " + rate + "Hz, bits: "
                + audioFormat + ", channel: " + channelConfig
                + ", bufferSizeInBytes:" + bufferSize);

            if (bufferSize > 0) {
              AudioRecord recorder = new AudioRecord(
                  AudioSource.MIC, rate, channelConfig,
                  audioFormat, bufferSize);

              if (recorder.getState() == AudioRecord.STATE_INITIALIZED) {
                gBufferSize = bufferSize;
                return recorder;
              }
              recorder.release();
              recorder = null;
            }
          } catch (Exception e) {
            Log.e(TAG, rate + "Exception, keep trying.", e);
          }
        }
      }
    }
    return null;
  }
  
  public static AudioTrack findAudioTrack() {
    for (int rate : mSampleRates) {
      for (short audioFormat : new short[] {
          AudioFormat.ENCODING_PCM_8BIT,
          AudioFormat.ENCODING_PCM_16BIT }) {
        for (short channelConfig : new short[] {
            AudioFormat.CHANNEL_IN_STEREO,
            AudioFormat.CHANNEL_IN_MONO }) {
          try {
            int bufferSize = AudioTrack.getMinBufferSize(rate,
                channelConfig, audioFormat);

            Log.d(TAG, "findAudioTrack:Attempting rate " + rate + "Hz, bits: "
                + audioFormat + ", channel: " + channelConfig
                + ", bufferSizeInBytes:" + bufferSize);

            if (bufferSize > 0) {
              AudioTrack track = new AudioTrack(
                  AudioManager.STREAM_MUSIC, rate, channelConfig,
                  audioFormat, bufferSize, AudioTrack.MODE_STREAM);

              if (track.getState() == AudioTrack.STATE_INITIALIZED) {
                gBufferSize = bufferSize;
                return track;
              }
              track.release();
              track = null;
            }
          } catch (Exception e) {
            Log.e(TAG, rate + "Exception, keep trying.", e);
          }
        }
      }
    }
    return null;
  }
}

Java Source Code List

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