2011.08.12（4）——— android AudioTrack 不能播放awr

2011.08.12（4）——— android AudioTrack 不能播放awr
http://blog.sina.com.cn/s/blog_7cb539590100qkcr.html
http://blog.csdn.net/chenjie19891104/article/details/6333553
http://blog.csdn.net/hellogv/article/details/6026455

我用AudioTrack播放MP3 awr都是不成功的只会传出一堆的噪声，但是播放wav是没有问题的，因为wav就相当于原生态的pcm

这时候我有两个选择

1、从3gp网站上下载awr解码算法用jni调用把awr解码成pcm
2、可以用AudioRecord来录制pcm 并用AudioTrack来播放

我用的时后者

package com.lp;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import android.app.Activity;import android.media.AudioFormat;import android.media.AudioManager;import android.media.AudioRecord;import android.media.AudioTrack;import android.media.MediaRecorder;import android.os.AsyncTask;import android.os.Bundle;import android.os.Environment;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;public class MainActivity extends Activity implements OnClickListener{private TextView stateView;private Button btnStart,btnStop,btnPlay,btnFinish;private RecordTask recorder;private PlayTask player;private File audioFile;private boolean isRecording=true, isPlaying=false; private int frequence = 44100; private int channelConfig = AudioFormat.CHANNEL_CONFIGURATION_MONO;private int audioEncoding = AudioFormat.ENCODING_PCM_16BIT;public void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.main_pcm);stateView = (TextView)this.findViewById(R.id.view_state);stateView.setText("准备开始");btnStart = (Button)this.findViewById(R.id.btn_start);btnStop = (Button)this.findViewById(R.id.btn_stop);btnPlay = (Button)this.findViewById(R.id.btn_play);btnFinish = (Button)this.findViewById(R.id.btn_finish);btnFinish.setText("停止播放");btnPlay.setEnabled(false);btnFinish.setEnabled(false);btnStart.setOnClickListener(this);btnStop.setOnClickListener(this);btnPlay.setOnClickListener(this);btnFinish.setOnClickListener(this);//File fpath = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/11");//fpath.mkdirs();try {//audioFile = File.createTempFile("test", ".pcm", fpath);audioFile = new File("/mnt/sdcard/1.pcm");} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}public void onClick(View v){int id = v.getId();switch(id){case R.id.btn_start:recorder = new RecordTask();recorder.execute();break;case R.id.btn_stop:this.isRecording = false;System.out.println(isRecording);break;case R.id.btn_play:player = new PlayTask();player.execute();break;case R.id.btn_finish:this.isPlaying = false;break;}}class RecordTask extends AsyncTask<Void, Integer, Void>{@Overrideprotected Void doInBackground(Void... arg0) {//isRecording = true;try {//开通输出流到指定的文件DataOutputStream dos = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(audioFile)));//FileOutputStream fos = new FileOutputStream(audioFile);//根据定义好的几个配置，来获取合适的缓冲大小int bufferSize = AudioRecord.getMinBufferSize(frequence, channelConfig, audioEncoding);//实例化AudioRecordAudioRecord record = new AudioRecord(MediaRecorder.AudioSource.MIC, frequence, channelConfig, audioEncoding, bufferSize);//定义缓冲short[] buffer = new short[bufferSize];//byte[] buffer = new byte[bufferSize];//开始录制record.startRecording();int r = 0; //存储录制进度//定义循环，根据isRecording的值来判断是否继续录制while(isRecording){//从bufferSize中读取字节，返回读取的short个数//这里老是出现buffer overflow，不知道是什么原因，试了好几个值，都没用，TODO：待解决int bufferReadResult = record.read(buffer, 0, buffer.length);//循环将buffer中的音频数据写入到OutputStream中for(int i=0; i<bufferReadResult; i++){dos.writeShort(buffer[i]);}//byte[] tmpBuf = new byte[bufferReadResult];  //                    System.arraycopy(buffer, 0, tmpBuf, 0, bufferReadResult); //                    fos.write(tmpBuf, 0, bufferReadResult);//                    fos.flush();publishProgress(new Integer(r)); //向UI线程报告当前进度r++; //自增进度值}//录制结束record.stop();System.out.println("The File length::"+audioFile.length());dos.close();//fos.close();} catch (Exception e) {// TODO: handle exception}return null;}//当在上面方法中调用publishProgress时，该方法触发,该方法在UI线程中被执行protected void onProgressUpdate(Integer...progress){stateView.setText(progress[0].toString());}protected void onPostExecute(Void result){btnStop.setEnabled(false);btnStart.setEnabled(true);btnPlay.setEnabled(true);btnFinish.setEnabled(false);}protected void onPreExecute(){//stateView.setText("正在录制");btnStart.setEnabled(false);btnPlay.setEnabled(false);btnFinish.setEnabled(false);btnStop.setEnabled(true);}}class PlayTask extends AsyncTask<Void, Integer, Void>{@Overrideprotected Void doInBackground(Void... arg0) {isPlaying = true;int bufferSize = AudioTrack.getMinBufferSize(frequence, channelConfig, audioEncoding);short[] buffer = new short[bufferSize/4];//byte[] buffer = new byte[bufferSize];try {//定义输入流，将音频写入到AudioTrack类中，实现播放DataInputStream dis = new DataInputStream(new BufferedInputStream(new FileInputStream(audioFile)));//FileInputStream fis = new FileInputStream(audioFile);//实例AudioTrackAudioTrack track = new AudioTrack(AudioManager.STREAM_MUSIC, frequence, channelConfig, audioEncoding, bufferSize, AudioTrack.MODE_STREAM);//开始播放track.play();//由于AudioTrack播放的是流，所以，我们需要一边播放一边读取while(isPlaying && dis.available()>0){int i = 0;while(dis.available()>0 && i<buffer.length){buffer[i] = dis.readShort();i++;}//然后将数据写入到AudioTrack中track.write(buffer, 0, buffer.length);}//播放结束track.stop();dis.close();} catch (Exception e) {// TODO: handle exception}return null;}protected void onPostExecute(Void result){btnPlay.setEnabled(true);btnFinish.setEnabled(false);btnStart.setEnabled(true);btnStop.setEnabled(false);}protected void onPreExecute(){//stateView.setText("正在播放");btnStart.setEnabled(false);btnStop.setEnabled(false);btnPlay.setEnabled(false);btnFinish.setEnabled(true);}}}

对了别忘了权限

<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.RECORD_AUDIO" />

注意：其实这种方法也是不可取的因为保存的PCM原始音频没有压缩所以非常大，一般还是用awr来传输所以还是需要解码的

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