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流媒体程序开发之:H264解码器移植到OPhone

 2009-09-22 00:00:00 来源:WEB开发网   
核心提示: 图片看不清楚?请点击这里查看原图(大图),图片看不清楚?请点击这里查看原图(大图),流媒体程序开发之:H264解码器移植到OPhone(6),如果你看到了Install:**,这说明你的库已经编译好了,很有可能遇到这个问题,5.4编写库测试程序用Eclipse创建一个OPhone工程,FAQ 2

图片看不清楚?请点击这里查看原图(大图)。

流媒体程序开发之:H264解码器移植到OPhone

图片看不清楚?请点击这里查看原图(大图)。

如果你看到了Install:**,这说明你的库已经编译好了。

FAQ 2:

如果编译遇到下面错误,怎么办?

error: redefinition of typedef 'int8_t'  

需要注释掉你的代码中“typedef signed char  int8_t;”,如果你的代码之前是已经移植到了Mobile/Symbian上的话,很有可能遇到这个问题。

5.4 编写库测试程序

用Eclipse创建一个OPhone工程,在入口类中输入如下代码:

/**    
 * @author ophone 
 * @email 3751624@qq.com 
 */  
  
package ophone.streaming.video.h264;  
  
import java.io.File;  
import java.io.FileInputStream;  
import java.io.InputStream;  
import java.nio.ByteBuffer;  
import OPhone.app.Activity;  
import OPhone.graphics.BitmapFactory;  
import OPhone.os.Bundle;  
import OPhone.os.Handler;  
import OPhone.os.Message;  
import OPhone.widget.ImageView;  
import OPhone.widget.TextView;  
  
public class H264Example extends Activity {  
      
    private static final int VideoWidth = 352;  
    private static final int VideoHeight = 288;  
      
    private ImageView ImageLayout = null;  
    private TextView FPSLayout = null;  
    private H264decode Decode = null;  
    private Handler H = null;  
    private byte[] Buffer = null;  
      
    private int DecodeCount = 0;  
    private long StartTime = 0;  
  
    public void onCreate(Bundle savedInstanceState) {  
          
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
          
        ImageLayout = (ImageView) findViewById(R.id.ImageView);  
        FPSLayout = (TextView) findViewById(R.id.TextView);  
        Decode = new H264decode();  
          
        StartTime = System.currentTimeMillis();  
          
        new Thread(new Runnable(){  
            public void run() {  
                StartDecode();  
            }  
        }).start();  
          
        H = new Handler(){  
            public void handleMessage(Message msg) {  
                ImageLayout.invalidate();  
                ImageLayout.setImageBitmap(BitmapFactory.decodeByteArray(Buffer, 0, Buffer.length));  
                  
                long Time = (System.currentTimeMillis()-StartTime)/1000;  
                if(Time > 0){  
                    FPSLayout.setText("花费时间:" + Time + "秒  解码帧数:" + DecodeCount + "  FPS:" + (DecodeCount/Time) );  
                }  
            }  
        };  
    }  
      
    private void StartDecode(){  
          
        File h264file = new File("/tmp/Demo.264");  
        InputStream h264stream = null;  
        try {  
              
            h264stream = new FileInputStream(h264file);  
            ByteBuffer pInBuffer = ByteBuffer.allocate(51200);//分配50k的缓存  
            ByteBuffer pRGBBuffer = ByteBuffer.allocate(VideoWidth*VideoHeight*3);  
              
            while (h264stream.read(pInBuffer.array(), pInBuffer.position(), pInBuffer.remaining()) >= 0) {  
                  
                pInBuffer.position(0);  
                do{  
                    int DecodeLength = Decode.DecodeOneFrame(pInBuffer, pRGBBuffer);  
                      
                    //如果解码成功,把解码出来的图片显示出来  
                    if(DecodeLength > 0 && pRGBBuffer.position() > 0){  
                          
                        //转换RGB字节为BMP  
                        BMPImage bmp = new BMPImage(pRGBBuffer.array(),VideoWidth,VideoHeight);  
                        Buffer = bmp.getByte();  
              
                        H.sendMessage(H.obtainMessage());  
  
                        Thread.sleep(1);  
                        DecodeCount ++;  
                    }  
                      
                }while(pInBuffer.remaining() > 10240);//确保缓存区里面的数据始终大于10k  
                  
                //清理已解码缓冲区  
                int Remaining = pInBuffer.remaining();  
                System.arraycopy(pInBuffer.array(), pInBuffer.position(), pInBuffer.array(), 0, Remaining);  
                pInBuffer.position(Remaining);  
            }  
              
        } catch (Exception e1) {  
            e1.printStackTrace();  
        } finally {  
            try{h264stream.close();} catch(Exception e){}  
        }  
          
    }  
  
    protected void onDestroy() {  
        super.onDestroy();  
        Decode.Cleanup();  
    }  
}
  

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Tags:流媒体 程序开发 解码器

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