ffmpeg Android 视频转码

ffmpeg Android 视频转码

1. 创建sdcard:通过命令行使用mksdcard.exe 创mysdcrad.img向sdcard中添加内容：两种可行方案，一种启动虚拟机后直接在eclipse的file explorer的视图中找到/mnt/sdcard文件夹，再点击图标即可；另外还可以通过adbshell中使用adb push文件+对应的sdcard路径

2. 添加虚拟器中读sdcard文件的可写<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>

3. 编写jni调用可参考
   http://blog.csdn.net/leixiaohua1020/article/details/47056365

cmd环境下javah使用

javah -classpath D:\Android4.0\workspace\SFFmpegAndroidHelloWorld\bin\classes -bootclasspath D:\Android4.0\android-sdk\platforms\android-14\android.jar com.example.sffmpegandroidhelloworld.Android_FFmpeg_Decoder_Activity
-classpath 寻找.class文件路径
-bootclasspath android.jar包路径

Activity设计实现

目标：实现交互式sdcard文件预览，点击选中视频文件，并生成mkv视频格式。

• 需要创建派生于ListFragment的并实现onListItemClick的重载

package com.paad.todolist;

import com.example.sffmpegandroidhelloworld.Android_FFmpeg_Decoder_Activity.MyBroadcastReceiver;

import android.app.ListFragment;
import android.content.Intent;
import android.util.Log;
import android.view.View;
import android.widget.ListView;

//创建一个对应链表类;
public class FileListFragment extends ListFragment {
	 public int selectid;
	 public fileItem selectfile=null;
	 public void onListItemClick(ListView l, View v, int position, long id) {
		 Log.println(Log.DEBUG, "we are", "ClickListItem");   //添加链表点击打印;
		 selectfile=(fileItem)getListView().getItemAtPosition(position); 
         Intent selctIntent=new Intent(MyBroadcastReceiver.EXTRA_FILTER);
         selctIntent.putExtra("UPDATE_TRANSFILE", "transfile");
         selctIntent.putExtra("TEXT_VALUE",selectfile.getFilename());
         getActivity().sendBroadcast(selctIntent);  //绑定过的Fragment;
	 }
	 //返回选中的值;
	 public fileItem getSelectItem(){
		 return selectfile;
	 }
}

• 封装文件节点类

package com.paad.todolist;
public class fileItem {
   String filename;
   String Type;
 public fileItem(){
	 filename=null;
	 Type=null;
 }
public fileItem(String filename, String type) {
	super();
	this.filename = filename;
	Type = type;
}
public String getFilename() {
	return filename;
}
public void setFilename(String filename) {
	this.filename = filename;
}
public String getType() {
	return Type;
}
public void setType(String type) {
	Type = type;
}
@Override
public String toString() {
	return "fileItem []";
}	
}

• 绘制每一个item对应的listview中的每一项对应的View类

package com.paad.todolist;

import java.util.List;

import com.example.sffmpegandroidhelloworld.R;

import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import android.widget.TextView;

public class MyArrayAdapter extends ArrayAdapter<fileItem> {
   int resource;

public MyArrayAdapter(Context context, int resource, int textViewResourceId, List<fileItem> objects) {
	super(context, resource, textViewResourceId, objects);
	// TODO Auto-generated constructor stub
}

public MyArrayAdapter(Context context, int textViewResourceId, List<fileItem> objects) {
	super(context, textViewResourceId, objects);
	Log.println(Log.DEBUG, "we are", "init9");
	resource=textViewResourceId;
	Log.println(Log.DEBUG, "we are", "init10");
	// TODO Auto-generated constructor stub
}

public View getView(int position,View convertView,ViewGroup parent){
	Log.println(Log.DEBUG, "we are", "init11");
	 LinearLayout fileView;
   	 fileItem item =getItem(position);
   	 String filename =item.getFilename();
   	 String fileType=item.getType();
   	 if(convertView==null){
   		fileView=new LinearLayout(getContext());
   		String inflater=Context.LAYOUT_INFLATER_SERVICE;    
   		LayoutInflater li;
   		li=(LayoutInflater)getContext().getSystemService(inflater);
   		li.inflate(resource, fileView,true);
   		Log.println(Log.DEBUG, "we are", "init11");
   	 }else{
   		fileView=(LinearLayout)convertView;
   	 }
   	 TextView fileText=(TextView)fileView.findViewById(R.id.filename);
   	 TextView TypeText=(TextView)fileView.findViewById(R.id.filetype);
   	 fileText.setText(filename);
     TypeText.setText(fileType);
     Log.println(Log.DEBUG, "we are", "init12");
     return fileView;
}
}

• Activity类实现

package com.example.sffmpegandroidhelloworld;

import java.io.File;
import java.util.ArrayList;

import com.paad.todolist.FileListFragment;
import com.paad.todolist.MyArrayAdapter;
import com.paad.todolist.fileItem;

import android.app.Activity;
import android.app.FragmentManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.graphics.drawable.Drawable;
import android.net.Uri;
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 Android_FFmpeg_Decoder_Activity extends Activity{

	private FileListFragment listViewer;
	private MyArrayAdapter fileItemsAdapter;
	private ArrayList<fileItem>fillist;
	protected TextView cmdEdittext=null; 
	  //添加广播接收;
    public class MyBroadcastReceiver extends BroadcastReceiver{
	    public final static String EXTRA_NAME="UPDATE_TRANSFILE";
	    public final static String EXTRA_KEY="TEXT_VALUE";
	    public final static String EXTRA_FILTER="UI_TRANS";
		@Override
		public void onReceive(Context context, Intent intent) {
			String receivename=intent.getStringExtra(EXTRA_NAME);
			if(receivename.equals("transfile")){
				//String的值如果不是new String,如果都是相同的字符串就会放在一个地方;
				String receiverText=intent.getStringExtra(EXTRA_KEY);
				cmdEdittext.setText(receiverText);	
				String pstr="you";
			}
		 } 	
	}
	private IntentFilter filter=new IntentFilter(MyBroadcastReceiver.EXTRA_FILTER);
	private  MyBroadcastReceiver receiver=new MyBroadcastReceiver();
	@Override
	protected void onPause() {
		// TODO Auto-generated method stub
		super.onPause();
		unregisterReceiver(receiver);
	}
	//采用匿名内部类的方式;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		Log.println(Log.DEBUG, "we are", "init0");
		super.onCreate(savedInstanceState);
		Log.println(Log.DEBUG, "we are", "init1");
		setContentView(R.layout.decode_ffmpeg_activity);
		final Button filePrev=(Button)findViewById(R.id.pre_file);   //选择文件;
		final Button startButton=(Button)findViewById(R.id.after_file);  //开始进行文件转换;
		cmdEdittext= (TextView)findViewById(R.id.filetoTrans1);
		Log.println(Log.DEBUG, "we are", "init2");
		filePrev.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				fillist.clear();
				Log.println(Log.DEBUG, "we are", "init14");
				final File file=Environment.getExternalStorageDirectory();
			    final File[]  files = file.listFiles();
			    Drawable currentIcon=null; 
				// TODO Auto-generated method stu;
				for (File currentFile : files)
				{
					fileItem p=new fileItem();
					if (currentFile.isDirectory()){
						currentIcon = getResources().getDrawable(R.drawable.folder);
						p.setFilename(currentFile.getName());
						p.setType("folder");
					}
					else
					{	
						String fileName = currentFile.getName();
					    p.setFilename(fileName);
					    if(checkEndsWithInStringArray(fileName,getResources().getStringArray(R.array.fileEndingImage)))
					    {
						   currentIcon = getResources().getDrawable(R.drawable.img);
						   p.setType("img");
					    }
					    else if(checkEndsWithInStringArray(fileName,getResources().getStringArray(R.array.fileEndingVideo))){
					       currentIcon = getResources().getDrawable(R.drawable.video);
					       p.setType("video");
					    }
							  
					    else if(checkEndsWithInStringArray(fileName,getResources().getStringArray(R.array.fileEndingAudio))){
					    	currentIcon = getResources().getDrawable(R.drawable.audio);
						    p.setType("audio");
					    	   
					    }
					    else 	
					        p.setType("default");
					}
					if(fillist!=null){
						fillist.add(p);	
						Log.println(Log.DEBUG, "we are", "init15");
					}
					fileItemsAdapter.notifyDataSetChanged();
				}
			}
	     });
		Log.println(Log.DEBUG, "we are", "init3");
		fillist=new ArrayList<fileItem>();
		Log.println(Log.DEBUG, "we are", "init4");
		int resId=R.layout.file_image1;
		Log.println(Log.DEBUG, "we are", "init5");
		fileItemsAdapter=new MyArrayAdapter(this, resId, fillist);
		Log.println(Log.DEBUG, "we are", "init6");
		FragmentManager fm=getFragmentManager();
		listViewer=(FileListFragment)fm.findFragmentById(R.id.FileListFragment);
		listViewer.setListAdapter(fileItemsAdapter);
		startButton.setOnClickListener(new OnClickListener() {
			public void onClick(View v) {
				 String cmdline="ffmpeg -i"+" "+Environment.getExternalStorageDirectory()+"/"+cmdEdittext.getText().toString()+ " "+Environment.getExternalStorageDirectory()+"/"+cmdEdittext.getText().toString().substring(0,cmdEdittext.getText().toString().lastIndexOf('.'))+".mkv"; 
				 Log.println(Log.DEBUG, "we are", cmdline);
	             String[] argv=cmdline.split(" ");  
	             Integer argc=argv.length;  
	             ffmpegcore(argc,argv);  
			}
		});
   }

   protected void onResume(){
	   super.onResume();
	   Log.println(Log.DEBUG, "we are", "init0");
	   registerReceiver(receiver,filter);
   }
   
   
   public native int ffmpegcore(int argc,String[] argv);  
    private boolean  checkEndsWithInStringArray(String checkItsEnd,String[] fileEndings){
    	for(String aEnd:fileEndings){  
    	   if(checkItsEnd.endsWith(aEnd))  
    		    return true;
    	}
    	return false;
    }
    static {
		System.loadLibrary("avutil-55");
    	System.loadLibrary("swresample-2");
    	System.loadLibrary("swscale-4");
    	System.loadLibrary("avcodec-57");
        System.loadLibrary("avformat-57");
        System.loadLibrary("avfilter-6");
        System.loadLibrary("avdevice-57");
        System.loadLibrary("decoder_transfer");
	}
}

源码分享地址：http://pan.baidu.com/s/1bKf94i 密码:kfa1