Mediarecoder得到aac(通过LocalSocket)

package com.example.ffmpegaudio;import java.io.BufferedOutputStream;import java.io.DataInputStream;import java.io.File;import java.io.FileDescriptor;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.RandomAccessFile;import java.nio.Buffer;import android.app.Activity;import android.media.MediaRecorder;import android.net.LocalServerSocket;import android.net.LocalSocket;import android.net.LocalSocketAddress;import android.os.Bundle;import android.util.Log;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class MainActivity extends Activity {private MediaRecorder mediarecorder;private LocalSocket sender;private LocalSocket received;private LocalServerSocket lss;private static final int BUFFER_SIZE=5000;Button sendButton;Button receivedButton;private InputStream inputStream;private Recoder recoder;byte[] buffer;private BufferedOutputStream bufferedoutstream;private RandomAccessFile raf;private boolean ISrunning;private Thread getAudio;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);sendButton=(Button)findViewById(R.id.send);receivedButton=(Button)findViewById(R.id.received);sendButton.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubLog.e("fdsa", "start button.....");ISrunning=true;recoder=new Recoder();recoder.start();MediaRecoderInit();getAudio=new GetAudio();getAudio.start();}});receivedButton.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubLog.e("fdsa", "stop the recording...");ISrunning=false;if (recoder!=null) {recoder.interrupt();}if(mediarecorder!=null){mediarecorder.stop();mediarecorder.release();mediarecorder=null;}if (inputStream!=null) {try {inputStream.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}inputStream=null;}}});}private void MediaRecoderInit(){//设置MediaRecoderFile file=new File("/sdcard/LocalSocket.aac");try {raf=new RandomAccessFile(file, "rw");} catch (FileNotFoundException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}if (mediarecorder==null) {mediarecorder=new MediaRecorder();}mediarecorder.setAudioSource(MediaRecorder.AudioSource.MIC);mediarecorder.setOutputFormat(MediaRecorder.OutputFormat.AAC_ADTS);mediarecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);mediarecorder.setOutputFile(sender.getFileDescriptor());try {mediarecorder.prepare();} catch (IllegalStateException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}mediarecorder.start();}class GetAudio extends Thread{byte[] buffer=new byte[1024];int length=0;int len=0;int readlength=0;public void run() {try {while(ISrunning){while(readlength<1024){readlength +=inputStream.read(buffer,readlength,1024-readlength);Log.v("fds", "readlength--->"+readlength);}raf.write(buffer,0,readlength);readlength=0;}} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}};}class Recoder extends Thread{@Overridepublic void run() {// TODO Auto-generated method stubsuper.run();//localsocket可以类比socket，在源(mediaRcoder.setOutputFile(sender.getFileDescriptor()))中//使用serversocket，发送本地，用socket在本地接收，得到的就是流;//在本地用InputStream inprutstream = receiver.getInputStream();在本地得到流received=new LocalSocket();try {lss=new LocalServerSocket("today_Socket");//相当于serversocekt开端口received.connect(new LocalSocketAddress("today_Socket"));//相当于socket客户端received.setReceiveBufferSize(BUFFER_SIZE);received.setSendBufferSize(BUFFER_SIZE);sender=lss.accept();//相当于serversocket等待连接，成功返回一个localsocketsender.setReceiveBufferSize(BUFFER_SIZE);sender.setSendBufferSize(BUFFER_SIZE);inputStream=received.getInputStream();} catch (IOException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}Log.v("fdsa", "recoding audio....");}}}

注意：（1）在配置文件中添加读取外部设备（内存卡）权限和MIC权限。

    （2）在MainActivity中不要放while死循环，否则造成（主频高的CPU无响应、差的CPU直接卡死）

    （3）Inputstream.read时要注意：

InputStream.read(byte[] b)和InputStream.read(byte[] b,int off,int len)这两个方法都是用来从流里读取多个字节的，有经验的程序员就会发现，这两个方法经常 读取不到自己想要读取的个数的字节。比如第一个方法，程序员往往希望程序能读取到b.length个字节，而实际情况是，系统往往读取不了这么多。仔细阅读Java的API说明就发现了，这个方法 并不保证能读取这么多个字节，它只能保证最多读取这么多个字节(最少1个)。因此，如果要让程序读取count个字节，最好用以下代码：
  byte[] b = new byte[count];
  int readCount = 0; // 已经成功读取的字节的个数
  while (readCount < count) {
   readCount += in.read(bytes, readCount, count - readCount);
  }
      用这段代码可以保证读取count个字节，除非中途遇到IO异常或者到了数据流的结尾(EOFException)