Android Open Source - voicelink A A C Stream

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2011-2014 GUIGUI Simon, fyhertz@gmail.com
 * /*from   ww  w  .  j av a 2  s  .c o  m*/
 * This file is part of libstreaming (https://github.com/fyhertz/libstreaming)
 * 
 * Spydroid is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this source code; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package net.audio.send;

import java.io.IOException;
import java.net.InetAddress;
import java.nio.ByteBuffer;

import android.annotation.SuppressLint;
import android.content.SharedPreferences;
import android.media.AudioFormat;
import android.media.AudioRecord;
import android.media.MediaCodec;
import android.media.MediaCodecInfo;
import android.media.MediaFormat;
import android.media.MediaRecorder;
import android.os.Build;
import android.service.textservice.SpellCheckerService.Session;
import android.util.Log;

/**
 * A class for streaming AAC from the camera of an android device using RTP. You
 * should use a {@link Session} instantiated with {@link SessionBuilder} instead
 * of using this class directly. Call
 * {@link #setDestinationAddress(InetAddress)},
 * {@link #setDestinationPorts(int)} and {@link #setAudioQuality(AudioQuality)}
 * to configure the stream. You can then call {@link #start()} to start the RTP
 * stream. Call {@link #stop()} to stop the stream.
 */
public class AACStream {

  public final static String TAG = "AACStream";

  protected boolean mStreaming = false, mConfigured = false;
  protected int mRtpPort = 0, mRtcpPort = 0;
  protected InetAddress mDestination;

  /** MPEG-4 Audio Object Types supported by ADTS. **/
  private static final String[] AUDIO_OBJECT_TYPES = { "NULL", // 0
      "AAC Main", // 1
      "AAC LC (Low Complexity)", // 2
      "AAC SSR (Scalable Sample Rate)", // 3
      "AAC LTP (Long Term Prediction)" // 4
  };

  /** There are 13 supported frequencies by ADTS. **/
  public static final int[] AUDIO_SAMPLING_RATES = { 96000, // 0
      88200, // 1
      64000, // 2
      48000, // 3
      44100, // 4
      32000, // 5
      24000, // 6
      22050, // 7
      16000, // 8
      12000, // 9
      11025, // 10
      8000, // 11
      7350, // 12
      -1, // 13
      -1, // 14
      -1, // 15
  };

  private String mSessionDescription = null;
  private int mProfile, mSamplingRateIndex, mChannel, mConfig;
  private SharedPreferences mSettings = null;
  private AudioRecord mAudioRecord = null;
  private Thread mThread = null;

  public AACStream() {
    super();

    if (!AACStreamingSupported()) {
      Log.e(TAG, "AAC not supported on this phone");
      throw new RuntimeException("AAC not supported by this phone !");
    } else {
      Log.d(TAG, "AAC supported on this phone");
    }

  }

  private static boolean AACStreamingSupported() {
    if (Build.VERSION.SDK_INT < 14)
      return false;
    try {
      MediaRecorder.OutputFormat.class.getField("AAC_ADTS");
      return true;
    } catch (Exception e) {
      return false;
    }
  }

  /**
   * Some data (the actual sampling rate used by the phone and the AAC
   * profile) needs to be stored once {@link #getSessionDescription()} is
   * called.
   * 
   * @param prefs
   *            The SharedPreferences that will be used to store the sampling
   *            rate
   */
  public void setPreferences(SharedPreferences prefs) {
    mSettings = prefs;
  }

  public synchronized void start() throws IllegalStateException, IOException {
    // if (!mStreaming) {
    // configure();
    // }
  }

  public synchronized void configure() throws IllegalStateException, IOException {
    // super.configure();
    // mQuality = mRequestedQuality.clone();
    //
    // // Checks if the user has supplied an exotic sampling rate
    // int i=0;
    // for (;i<AUDIO_SAMPLING_RATES.length;i++) {
    // if (AUDIO_SAMPLING_RATES[i] == mQuality.samplingRate) {
    // mSamplingRateIndex = i;
    // break;
    // }
    // }
    // // If he did, we force a reasonable one: 16 kHz
    // if (i>12) mQuality.samplingRate = 16000;
    //
    // if (mMode != mRequestedMode || mPacketizer==null) {
    // mMode = mRequestedMode;
    // if (mMode == MODE_MEDIARECORDER_API) {
    // mPacketizer = new AACADTSPacketizer();
    // } else {
    // mPacketizer = new AACLATMPacketizer();
    // }
    // }
    //
    //
    // if (mMode == MODE_MEDIARECORDER_API) {
    //
    // testADTS();
    //
    // // All the MIME types parameters used here are described in RFC 3640
    // // SizeLength: 13 bits will be enough because ADTS uses 13 bits for
    // frame length
    // // config: contains the object type + the sampling rate + the channel
    // number
    //
    // // TODO: streamType always 5 ? profile-level-id always 15 ?
    //
    // mSessionDescription =
    // "m=audio "+String.valueOf(getDestinationPorts()[0])+" RTP/AVP 96\r\n"
    // +
    // "a=rtpmap:96 mpeg4-generic/"+mQuality.samplingRate+"\r\n"+
    // "a=fmtp:96 streamtype=5; profile-level-id=15; mode=AAC-hbr; config="+Integer.toHexString(mConfig)+"; SizeLength=13; IndexLength=3; IndexDeltaLength=3;\r\n";
    //
    // } else {
    //
    // mProfile = 2; // AAC LC
    // mChannel = 1;
    // mConfig = mProfile<<11 | mSamplingRateIndex<<7 | mChannel<<3;
    //
    // mSessionDescription =
    // "m=audio "+String.valueOf(getDestinationPorts()[0])+" RTP/AVP 96\r\n"
    // +
    // "a=rtpmap:96 mpeg4-generic/"+mQuality.samplingRate+"\r\n"+
    // "a=fmtp:96 streamtype=5; profile-level-id=15; mode=AAC-hbr; config="+Integer.toHexString(mConfig)+"; SizeLength=13; IndexLength=3; IndexDeltaLength=3;\r\n";
    //
    // }

  }

  protected void encodeWithMediaRecorder() throws IOException {
  }

  protected AACLATMPacketizer mPacketizer = null;
  public MediaCodec mMediaCodec;

  protected AudioQuality mRequestedQuality = AudioQuality.DEFAULT_AUDIO_QUALITY.clone();
  protected AudioQuality mQuality = mRequestedQuality.clone();

  public MediaCodecInputStream inputStream;
  public ByteBuffer[] mMediaCodecInputBuffers;

  @SuppressLint({ "InlinedApi", "NewApi" })
  public void initializeMediaCodec() {

    bufferSize = AudioRecord.getMinBufferSize(mQuality.samplingRate, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT) * 2;

    // mPacketizer.setSamplingRate(mQuality.samplingRate);

    mAudioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, mQuality.samplingRate, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT, bufferSize);
    mMediaCodec = MediaCodec.createEncoderByType("audio/mp4a-latm");
    MediaFormat format = new MediaFormat();
    format.setString(MediaFormat.KEY_MIME, "audio/mp4a-latm");
    format.setInteger(MediaFormat.KEY_BIT_RATE, mQuality.bitRate);
    format.setInteger(MediaFormat.KEY_CHANNEL_COUNT, 1);
    format.setInteger(MediaFormat.KEY_SAMPLE_RATE, mQuality.samplingRate);
    format.setInteger(MediaFormat.KEY_AAC_PROFILE, MediaCodecInfo.CodecProfileLevel.AACObjectLC);
    format.setInteger(MediaFormat.KEY_MAX_INPUT_SIZE, bufferSize);
    mMediaCodec.configure(format, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);

    mMediaCodec.start();

    mMediaCodecInputBuffers = mMediaCodec.getInputBuffers();

  }

  int bufferSize;

  @SuppressLint({ "InlinedApi", "NewApi" })
  public void encodeWithMediaCodec() throws IOException {

    mAudioRecord.startRecording();

    mThread = new Thread(new Runnable() {
      @Override
      public void run() {
        int len = 0, bufferIndex = 0;
        try {
          Log.e(TAG, "Start the vioce record loop");
          while (!Thread.interrupted()) {
            bufferIndex = mMediaCodec.dequeueInputBuffer(10000);
            // Log.e(TAG, "vioce record loop: " + bufferIndex);
            if (bufferIndex >= 0) {
              mMediaCodecInputBuffers[bufferIndex].clear();
              len = mAudioRecord.read(mMediaCodecInputBuffers[bufferIndex], bufferSize);
              if (len == AudioRecord.ERROR_INVALID_OPERATION || len == AudioRecord.ERROR_BAD_VALUE) {
                Log.e(TAG, "An error occured with the AudioRecord API !");
              } else {
                // Log.e(TAG,
                // "Pushing raw audio to the decoder: len=" +
                // len + " bs: " +
                // mMediaCodecInputBuffers[bufferIndex].capacity());
                mMediaCodec.queueInputBuffer(bufferIndex, 0, len, System.nanoTime() / 1000, 0);
              }
            }
          }
          Log.e(TAG, "the vioce record loop exit.");
        } catch (RuntimeException e) {
          e.printStackTrace();
        }
      }
    });

    mThread.start();

    // The packetizer encapsulates this stream in an RTP stream and send it
    // over the network
    // mPacketizer.setDestination(mDestination, mRtpPort, mRtcpPort);
    // mPacketizer.setInputStream(inputStream);
    // mPacketizer.start();

    mStreaming = true;

  }

  /** Stops the stream. */
  public synchronized void stop() {
    if (mStreaming) {
      Log.d(TAG, "Interrupting threads...");
      mThread.interrupt();
      mAudioRecord.stop();
      mAudioRecord.release();
      mAudioRecord = null;
    }
  }

  /**
   * Returns a description of the stream using SDP. It can then be included in
   * an SDP file. Will fail if called when streaming.
   */
  public String getSessionDescription() throws IllegalStateException {
    if (mSessionDescription == null)
      throw new IllegalStateException("You need to call configure() first !");
    return mSessionDescription;
  }

}

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