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android流媒体之硬编码【代码篇】

2024-07-01 23:08:52   223人阅读

 转载此处：http://www.apkbus.com/blog-86476-43829.html

上一篇文章进行了思路和１６进制文件的分析。这篇该代码实现了。目前没有在真实手机上测试， android4.0之后的模拟器可以用模拟摄像头或者叫做webcam的【其实就是笔记本摄像头】。之后会在程序安装包data/data/edu.ustb.videoencoder/下面会有h264.3gp，sps【存放sps数据】、pps【存放pps数据】、media.xml【存放找到mdat的位置】，/sdcard/encoder.h264【这个文件就是编码后的h264文件】。

     不多说，上源码。

[代码]：AndroidManifest.xml

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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="edu.ustb.videoencoder"
    android:versionCode="1"
    android:versionName="1.0" >
 
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />
    <uses-permission android:name="android.permission.INTERNET"/> 
    <uses-permission android:name="android.permission.CAMERA"/> 
    <uses-permission android:name="android.permission.RECORD_VIDEO"/> 
    <uses-permission android:name="android.permission.RECORD_AUDIO"/> 
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
 
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
 
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
 
</manifest>

 

[主程序代码]MainActivity.java：

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package edu.ustb.videoencoder;
 
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
 
import android.media.MediaRecorder;
import android.net.LocalServerSocket;
import android.net.LocalSocket;
import android.net.LocalSocketAddress;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.util.Log;
import android.view.Menu;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
import android.view.View;
 
public class MainActivity extends Activity implements Callback, Runnable{
 
    private static final String TAG = "VideoCamera";
     
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        InitSurfaceView();
        InitMediaSharePreference();
    }
 
    //初始化SurfaceView
    private SurfaceView mSurfaceView;
    private void InitSurfaceView() {
        mSurfaceView = (SurfaceView) this.findViewById(R.id.surface_camera);
        SurfaceHolder holder = mSurfaceView.getHolder();
        holder.addCallback(this);
        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        mSurfaceView.setVisibility(View.VISIBLE);
    }
     
    //初始化，记录mdat开始位置的参数
    SharedPreferences sharedPreferences;
    private final String mediaShare = "media";
    private void InitMediaSharePreference() {
        sharedPreferences = this.getSharedPreferences(mediaShare, MODE_PRIVATE);       
    }
 
 
    private SurfaceHolder mSurfaceHolder;
    private boolean mMediaRecorderRecording = false;
     
    public void surfaceCreated(SurfaceHolder holder) {
        mSurfaceHolder = holder;
    }
 
    public void surfaceChanged(SurfaceHolder holder, int format, int width,
            int height) {
        mSurfaceHolder = holder;
        if(!mMediaRecorderRecording) {
            InitLocalSocket();
            getSPSAndPPS();
            initializeVideo();
            startVideoRecording();
        }
         
    }
 
    public void surfaceDestroyed(SurfaceHolder holder) {
        // TODO Auto-generated method stub
         
    }
     
    //初始化LocalServerSocket LocalSocket
    LocalServerSocket lss;
    LocalSocket receiver, sender;
     
    private void InitLocalSocket(){
        try {
            lss = new LocalServerSocket("H264");
            receiver = new LocalSocket();
             
            receiver.connect(new LocalSocketAddress("H264"));
            receiver.setReceiveBufferSize(500000);
            receiver.setSendBufferSize(50000);
             
            sender = lss.accept();
            sender.setReceiveBufferSize(500000);
            sender.setSendBufferSize(50000);
             
        } catch (IOException e) {
            Log.e(TAG, e.toString());
            this.finish();
            return;
        }
         
    }
     
    //得到序列参数集SPS和图像参数集PPS,如果已经存储在本地
    private void getSPSAndPPS(){
        StartMdatPlace = sharedPreferences.getInt(
                String.format("mdata_%d%d.mdat", videoWidth, videoHeight), -1);
         
        if(StartMdatPlace != -1) {
            byte[] temp = new byte[100];
            try {
                FileInputStream file_in = MainActivity.this.openFileInput(
                        String.format("%d%d.sps", videoWidth,videoHeight));
                 
                int index = 0;
                int read=0;
                while(true)
                {
                    read = file_in.read(temp,index,10);
                    if(read==-1) break;
                    else index += read;
                }
                Log.e(TAG, "sps length:"+index);
                SPS = new byte[index];
                System.arraycopy(temp, 0, SPS, 0, index);
                                
                file_in.close();
                 
                index =0;
                //read PPS
                file_in = MainActivity.this.openFileInput(
                        String.format("%d%d.pps", videoWidth,videoHeight));
                while(true)
                {
                    read = file_in.read(temp,index,10);
                    if(read==-1) break;
                    else index+=read;
                }
                Log.e(TAG, "pps length:"+index);
                PPS = new byte[index];
                System.arraycopy(temp, 0, PPS, 0, index);
            } catch (FileNotFoundException e) {
                //e.printStackTrace();
                Log.e(TAG, e.toString());
            } catch (IOException e) {
                //e.printStackTrace();
                Log.e(TAG, e.toString());
            }
        } else {
            SPS = null;
            PPS = null;
        }
    }
     
    //初始化MediaRecorder
    private MediaRecorder mMediaRecorder = null;
    private int videoWidth = 320;
    private int videoHeight = 240;
    private int videoRate = 10;
     
    private String fd = "data/data/edu.ustb.videoencoder/h264.3gp";
     
    private boolean initializeVideo(){
        if(mSurfaceHolder == null) {
            return false;
        }
         
        mMediaRecorderRecording = true;
         
        if(mMediaRecorder == null) {
            mMediaRecorder = new MediaRecorder();
        } else {
            mMediaRecorder.reset();
        }
         
        mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
        mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        mMediaRecorder.setVideoFrameRate(videoRate);
        mMediaRecorder.setVideoSize(videoWidth, videoHeight);
        mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
        mMediaRecorder.setPreviewDisplay(mSurfaceHolder.getSurface());
        mMediaRecorder.setMaxDuration(0);
        mMediaRecorder.setMaxFileSize(0);
        if(SPS==null)
        {
            mMediaRecorder.setOutputFile(fd);
        }
        else
        {
            mMediaRecorder.setOutputFile(sender.getFileDescriptor());
        }
 
        try {
            mMediaRecorder.prepare();
            mMediaRecorder.start();
        } catch (IllegalStateException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
            releaseMediaRecorder();
        }
         
        return true;
    }
 
    //释放MediaRecorder资源
    private void releaseMediaRecorder(){
        if(mMediaRecorder != null) {
            if(mMediaRecorderRecording) {
                mMediaRecorder.stop();
                mMediaRecorderRecording = false;
            }
            mMediaRecorder.reset();
            mMediaRecorder.release();
            mMediaRecorder = null;
        }
    }
     
    //开始录像，启动线程
    private void startVideoRecording() {
        new Thread(this).start();
    }
     
    private final int MAXFRAMEBUFFER = 20480;//20K
    private byte[] h264frame = new byte[MAXFRAMEBUFFER];
    private final byte[] head = new byte[]{0x00,0x00,0x00,0x01};
    private RandomAccessFile file_test;
    public void run() {
        try {
             
            if(SPS == null) {
                Log.e(TAG, "Rlease MediaRecorder and get SPS and PPS");
                Thread.sleep(1000);
                //释放MediaRecorder资源
                releaseMediaRecorder();
                //从已采集的视频数据中获取SPS和PPS
                findSPSAndPPS();
                //找到后重新初始化MediaRecorder
                initializeVideo();
            }          
             
            DataInputStream dataInput = new DataInputStream(receiver.getInputStream());
            //先读取ftpy box and mdat box, 目的是skip ftpy and mdat data,(decisbe by phone)
            dataInput.read(h264frame, 0, StartMdatPlace);
             
            try {
                File file = new File("/sdcard/encoder.h264");
                if (file.exists())
                    file.delete();
                file_test = new RandomAccessFile(file, "rw");
            } catch (Exception ex) {
                Log.v("System.out", ex.toString());
            }
            file_test.write(head);
            file_test.write(SPS);//write sps
             
            file_test.write(head);
            file_test.write(PPS);//write pps
             
            int h264length =0;
             
 
            while(mMediaRecorderRecording) {
                h264length = dataInput.readInt();
                Log.e(TAG, "h264 length :" + h264length);
//              int number=0 , num=0;
//              int frame_size = 1024;
//              file_test.write(head);
//              while(number<h264length)
//              {
//                  int lost=h264length-number;
//                  num = dataInput.read(h264frame,0,frame_size<lost?frame_size:lost);
//                  Log.d(TAG,String.format("H264 %d,%d,%d", h264length,number,num));
//                  number+=num;
//                  file_test.write(h264frame, 0, num);
//              }
                ReadSize(h264length, dataInput);
                 
                byte[] h264 = new byte[h264length];
                System.arraycopy(h264frame, 0, h264, 0, h264length);
                 
                file_test.write(head);
                file_test.write(h264);//write selice
            }
              
            file_test.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
         
    }
     
    private void ReadSize(int h264length,DataInputStream dataInput) throws IOException, InterruptedException{
        int read = 0;
        int temp = 0;
        while(read<h264length)
        {
            temp= dataInput.read(h264frame, read, h264length-read);
            Log.e(TAG, String.format("h264frame %d,%d,%d", h264length,read,h264length-read));
            if(temp==-1)
            {
                Log.e(TAG, "no data get wait for data coming.....");
                Thread.sleep(2000);
                continue;
            }
            read += temp;
        }
    }
     
    //从 fd文件中找到SPS And PPS
    private byte[] SPS;
    private byte[] PPS;
    private int StartMdatPlace = 0;
    private void findSPSAndPPS() throws Exception{
        File file = new File(fd);
        FileInputStream fileInput = new FileInputStream(file);
         
        int length = (int)file.length();
        byte[] data = http://www.mamicode.com/new byte[length];
         
        fileInput.read(data);
         
        final byte[] mdat = new byte[]{0x6D,0x64,0x61,0x74};
        final byte[] avcc = new byte[]{0x61,0x76,0x63,0x43};
         
        for(int i=0 ; i<length; i++){
            if(data[i] == mdat[0] && data[i+1] == mdat[1] && data[i+2] == mdat[2] && data[i+3] == mdat[3]){
                StartMdatPlace = i+4;//find mdat
                break;
            }
        }
        Log.e(TAG, "StartMdatPlace:"+StartMdatPlace);
        //记录到xml文件里
        String mdatStr = String.format("mdata_%d%d.mdat",videoWidth,videoHeight);
        Editor editor = sharedPreferences.edit();
        editor.putInt(mdatStr, StartMdatPlace);
        editor.commit();
         
        for(int i=0 ; i<length; i++){
            if(data[i] == avcc[0] && data[i+1] == avcc[1] && data[i+2] == avcc[2] && data[i+3] == avcc[3]){
                int sps_start = i+3+7;//其中i+3指到avcc的c，再加7跳过6位AVCDecoderConfigurationRecord参数
                 
                //sps length and sps data
                byte[] sps_3gp = new byte[2];//sps length
                sps_3gp[1] = data[sps_start];
                sps_3gp[0] = data[sps_start + 1];
                int sps_length = bytes2short(sps_3gp);
                Log.e(TAG, "sps_length :" + sps_length);
                 
                sps_start += 2;//skip length
                SPS = new byte[sps_length];
                System.arraycopy(data, sps_start, SPS, 0, sps_length);
                //save sps
                FileOutputStream file_out = MainActivity.this.openFileOutput(
                        String.format("%d%d.sps",videoWidth,videoHeight),
                        Context.MODE_PRIVATE);
                file_out.write(SPS);
                file_out.close();
                 
                //pps length and pps data
                int pps_start = sps_start + sps_length + 1;
                byte[] pps_3gp =new byte[2];
                pps_3gp[1] = data[pps_start];
                pps_3gp[0] =data[pps_start+1];
                int pps_length = bytes2short(pps_3gp);
                Log.e(TAG, "PPS LENGTH:"+pps_length);
                 
                pps_start+=2;
                 
                PPS = new byte[pps_length];
                System.arraycopy(data, pps_start, PPS,0,pps_length);
                 
                 
                //Save PPS
                file_out = MainActivity.this.openFileOutput(
                        String.format("%d%d.pps",videoWidth,videoHeight),
                        Context.MODE_PRIVATE);
                file_out.write(PPS);
                file_out.close();
                break;
            }
        }
         
    }
     
    //计算长度
    public short bytes2short(byte[] b)
    {
                short mask=0xff;
                short temp=0;
                short res=0;
                for(int i=0;i<2;i++)
                {
                    res<<=8;
                    temp=(short)(b[1-i]&mask);
                    res|=temp;
                }
                return res;
    }
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
 
    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
        if(mMediaRecorderRecording)
        {
            releaseMediaRecorder();
             
            try {
                lss.close();
                receiver.close();
                sender.close();
            } catch (IOException e) {
                Log.e(TAG, e.toString());
            }
             
            mMediaRecorderRecording = false;
        }
        finish();
    }
 
     
     
}
完成后大家可以用VLC测试或者EsEye查看。与大家分享，下面的任务就是RTP打包的学习，对h264文件进行打包通过UDP发送出去。
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