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 
TrivialPlayer()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 
getAudioTrack()67     public AudioTrack getAudioTrack() { return mAudioTrack; }
68 
isPlaying()69     public boolean isPlaying() {
70         synchronized (this) {
71             return mIsPlaying;
72         }
73     }
74 
start()75     public void start() {
76         mPlay = true;
77         mFillerThread = new Thread(this);
78         mFillerThread.start();
79     }
80 
stop()81     public void stop() {
82         mPlay = false;
83         mFillerThread = null;
84     }
85 
shutDown()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
run()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