android流媒体之硬编码【代码篇】
时间：2014-04-30 02:06:15
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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 = 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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