AudioTrack 播放wav音频文件

Refrence

https://blog.csdn.net/qq_15255121/article/details/115168456
https://blog.csdn.net/qq_15255121/article/details/118964421

我们要想对wav文件格式操作，我们就要了解wav的文件格式。

由上图可知：

第8到11字节代表当前是wave格式也就是wav格式
第20-21字节代表当前的音频数据是什么格式如果是1代表是pcm格式
第24-28字节，代表当前的采样率
第34-35字节，代表当前的采样大小（位深）
第44字节开始，是我们真实的数据

通过上面的分析我们可以知道，wav只是把pcm包装了一下，我们可以从头中得到采样率采样大小位深等参数。并没有对音频数据进行压缩。

我们再结合 https://blog.csdn.net/qq_15255121/article/details/118964421 就可以实现对wav文件格式的播放。

package com.yuanxuzhen.androidmedia.audio;
import android.media.AudioAttributes;
import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioRecord;
import android.media.AudioTrack;
import android.os.Build;
import android.text.TextUtils;
import android.util.Log;
import androidx.annotation.RequiresApi;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
/******* wav格式可以参考https://blog.csdn.net/qq_15255121/article/details/115168456** ****/
public class WavPlayer {private static volatile WavPlayer instance;private AudioTrack mAudioTrack;private int audioFormat;private int buffersize;private ExecutorService executorService;private DataInputStream inputStream;private static final  int HEADER_SIZE = 44;private static final  int AUDIO_FORMAT_POSITION = 20;private static final  int AUDIO_NUM_CHANNEL_POSITION = 22;private static final  int AUDIO_BIT_PERSAMPLE_POSITION = 34;private static final  int AUDIO_SAMPLE_RATE_POSITION = 24;public class WavData{int channelMask = AudioFormat.CHANNEL_OUT_MONO;int sampleRate = 48000;int audioFormatEncodeing = AudioFormat.ENCODING_PCM_FLOAT;}private WavPlayer(){}public static WavPlayer getInstance(){if(instance == null){synchronized (WavPlayer.class){if(instance == null){instance = new WavPlayer();}}}return instance;}public WavData getInfo(String path){WavData info = new WavData();try{int bitPerSample = 0;if(TextUtils.isEmpty(path)){return null;}File file = new File(path);if(!file.exists()){return null;}InputStream  wavInputStrem = new FileInputStream(file);/*wav头部总共占44个字节*/ByteBuffer buffer = ByteBuffer.allocate(HEADER_SIZE);buffer.order(ByteOrder.LITTLE_ENDIAN); //格式 采样率 采样大小 声道数都是小端存储wavInputStrem.read(buffer.array(), buffer.arrayOffset(), buffer.capacity());buffer.rewind();buffer.position(AUDIO_FORMAT_POSITION);int format = buffer.getShort();Log.e("WavPlayer", "format = " + format);/*pcm播放*/if(format != 1){Log.e("WavPlayer", "format is not pcm");return null;}buffer.rewind();buffer.position(AUDIO_NUM_CHANNEL_POSITION);int channel = buffer.getShort();Log.e("WavPlayer", "channel="+channel);if(channel == 2){info.channelMask = AudioFormat.CHANNEL_OUT_STEREO;}buffer.rewind();buffer.position(AUDIO_SAMPLE_RATE_POSITION);info.sampleRate = buffer.getInt();Log.e("WavPlayer", "sampleRate="+info.sampleRate);buffer.rewind();buffer.position(AUDIO_BIT_PERSAMPLE_POSITION);bitPerSample = buffer.getShort();Log.e("WavPlayer", "bitPerSample="+bitPerSample);if(bitPerSample == 16){info.audioFormatEncodeing = AudioFormat.ENCODING_PCM_16BIT;}else if(bitPerSample == 8){info.audioFormatEncodeing = AudioFormat.ENCODING_PCM_8BIT;}else{info.audioFormatEncodeing = AudioFormat.ENCODING_PCM_FLOAT;}wavInputStrem.close();}catch (Exception e){e.printStackTrace();}return info;}@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)private void init(WavData data) {executorService = Executors.newCachedThreadPool();AudioFormat.Builder builder = new AudioFormat.Builder();builder.setChannelMask(data.channelMask).setEncoding(data.audioFormatEncodeing).setSampleRate(data.sampleRate);AudioFormat audioFormat = builder.build();buffersize = AudioTrack.getMinBufferSize(data.sampleRate,data.channelMask,data.audioFormatEncodeing);Log.e("yuanAudioTrack", "init buffersize=" + buffersize);AudioAttributes audioAttributes = (new AudioAttributes.Builder()).setContentType(AudioAttributes.CONTENT_TYPE_MUSIC).build();mAudioTrack = new AudioTrack(audioAttributes,audioFormat,buffersize,AudioTrack.MODE_STREAM,AudioManager.AUDIO_SESSION_ID_GENERATE);}/*** 播放线程*/Runnable recordRunnable = new Runnable() {@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)@Overridepublic void run() {try {//设置线程的优先级android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO);byte[] tempBuffer = new byte[buffersize];int readCount = 0;while (inputStream.available() > 0) {readCount= inputStream.read(tempBuffer);if (readCount == AudioTrack.ERROR_INVALID_OPERATION || readCount == AudioTrack.ERROR_BAD_VALUE) {continue;}if (readCount != 0 && readCount != -1) {//一边播放一边写入语音数据//判断AudioTrack未初始化，停止播放的时候释放了，状态就为STATE_UNINITIALIZEDif(mAudioTrack.getState() == mAudioTrack.STATE_UNINITIALIZED){return;}mAudioTrack.play();mAudioTrack.write(tempBuffer, 0, readCount);}}stopPlay();//播放完就停止播放} catch (Exception e) {e.printStackTrace();}}};private void setPath(String path) throws Exception {File file = new File(path);inputStream = new DataInputStream(new FileInputStream(file));inputStream.skipBytes(HEADER_SIZE); //跳过WAV头部44个字节}public void stopPlay() {try {if (mAudioTrack != null) {if (mAudioTrack.getState() == AudioRecord.STATE_INITIALIZED) {//初始化成功mAudioTrack.stop();//停止播放}if (mAudioTrack != null) {mAudioTrack.release();//释放audioTrack资源}mAudioTrack = null;}if (inputStream != null) {inputStream.close();//关闭数据输入流}} catch (Exception e) {e.printStackTrace();}}public void startPlay(String path) {try {WavData wavData = getInfo(path);if(wavData == null){return;}init(wavData);setPath(path);executorService.execute(recordRunnable);} catch (Exception e) {e.printStackTrace();}}
}

gitee地址：https://gitee.com/creat151/android-media.git

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AudioTrack 播放wav音频文件

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