Home | History | Annotate | Download | only in audio 
      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.cts.verifier.audio;
     18 
     19 import android.media.AudioFormat;
     20 import android.media.AudioManager;
     21 import android.media.AudioTrack;
     22 
     23 import java.lang.InterruptedException;
     24 import java.lang.Math;
     25 import java.lang.Runnable;
     26 
     27 public class TrivialPlayer implements Runnable {
     28     AudioTrack mAudioTrack;
     29     int mBufferSize;
     30 
     31     boolean mPlay;
     32     boolean mIsPlaying;
     33 
     34     short[] mAudioData;
     35 
     36     Thread mFillerThread = null;
     37 
     38     public TrivialPlayer() {
     39         mBufferSize =
     40                 AudioTrack.getMinBufferSize(
     41                     41000,
     42                     AudioFormat.CHANNEL_OUT_STEREO,
     43                     AudioFormat.ENCODING_PCM_16BIT);
     44         mAudioTrack =
     45             new AudioTrack(
     46                 AudioManager.STREAM_MUSIC,
     47                 41000,
     48                 AudioFormat.CHANNEL_OUT_STEREO,
     49                 AudioFormat.ENCODING_PCM_16BIT,
     50                 mBufferSize,
     51                 AudioTrack.MODE_STREAM);
     52 
     53         mPlay = false;
     54         mIsPlaying = false;
     55 
     56         // setup audio data (silence will suffice)
     57         mAudioData = new short[mBufferSize];
     58         for (int index = 0; index < mBufferSize; index++) {
     59             // mAudioData[index] = 0;
     60             // keep this code since one might want to hear the playnig audio
     61             // for debugging/verification.
     62             mAudioData[index] =
     63                 (short)(((Math.random() * 2.0) - 1.0) * (double)Short.MAX_VALUE/2.0);
     64         }
     65     }
     66 
     67     public AudioTrack getAudioTrack() { return mAudioTrack; }
     68 
     69     public boolean isPlaying() {
     70         synchronized (this) {
     71             return mIsPlaying;
     72         }
     73     }
     74 
     75     public void start() {
     76         mPlay = true;
     77         mFillerThread = new Thread(this);
     78         mFillerThread.start();
     79     }
     80 
     81     public void stop() {
     82         mPlay = false;
     83         mFillerThread = null;
     84     }
     85 
     86     public void shutDown() {
     87         stop();
     88         while (isPlaying()) {
     89             try {
     90                 Thread.sleep(10);
     91             } catch (InterruptedException ex) {
     92             }
     93         }
     94         mAudioTrack.release();
     95     }
     96 
     97     @Override
     98     public void run() {
     99         mAudioTrack.play();
    100         synchronized (this) {
    101             mIsPlaying = true;
    102         }
    103         while (mAudioTrack != null && mPlay) {
    104             mAudioTrack.write(mAudioData, 0, mBufferSize);
    105         }
    106         synchronized (this) {
    107             mIsPlaying = false;
    108         }
    109         mAudioTrack.stop();
    110     }
    111 }
    112