- (int)DecodeH264Frames: (unsigned char*)inputBuffer withLength:(int)aLength
{
int gotPicPtr=;
int result=;

av\_init\_packet(&pAvPackage);  
pAvPackage.data=(unsigned char\*)inputBuffer;  
pAvPackage.size=aLength;  
//解码  
result=avcodec\_decode\_video2(pCodecCtx, pVideoFrame, &gotPicPtr, &pAvPackage);

//如果视频尺寸更改，我们丢掉这个frame  
if((pictureWidth!=)&&(pictureWidth!=pCodecCtx->width)){  
    setRecordResolveState=;  
    pictureWidth=pCodecCtx->width;  
    return -;  
}

//YUV 420 Y U V  -> RGB  
if(gotPicPtr)  
{

    unsigned int lumaLength= (pCodecCtx->height)\*(MIN(pVideoFrame->linesize\[\], pCodecCtx->width));// W \* H  
    unsigned int chromBLength=((pCodecCtx->height)/)\*(MIN(pVideoFrame->linesize\[\], (pCodecCtx->width)/));// w \* h/4  
    unsigned int chromRLength=((pCodecCtx->height)/)\*(MIN(pVideoFrame->linesize\[\], (pCodecCtx->width)/));

    H264YUV\_Frame    yuvFrame;  
    memset(&yuvFrame, , sizeof(H264YUV\_Frame));

    yuvFrame.luma.length = lumaLength;  
    yuvFrame.chromaB.length = chromBLength;  
    yuvFrame.chromaR.length =chromRLength;  
    yuvFrame.luma.dataBuffer=(unsigned char\*)malloc(lumaLength);  
    yuvFrame.chromaB.dataBuffer=(unsigned char\*)malloc(chromBLength);  
    yuvFrame.chromaR.dataBuffer=(unsigned char\*)malloc(chromRLength);  
    copyDecodedFrame(pVideoFrame->data\[\],yuvFrame.luma.dataBuffer,pVideoFrame->linesize\[\],  
                     pCodecCtx->width,pCodecCtx->height);  
    copyDecodedFrame(pVideoFrame->data\[\], yuvFrame.chromaB.dataBuffer,pVideoFrame->linesize\[\],  
                     pCodecCtx->width / ,pCodecCtx->height / );  
    copyDecodedFrame(pVideoFrame->data\[\], yuvFrame.chromaR.dataBuffer,pVideoFrame->linesize\[\],  
                     pCodecCtx->width / ,pCodecCtx->height / );

    yuvFrame.width=pCodecCtx->width;  
    yuvFrame.height=pCodecCtx->height;

    dispatch\_sync(dispatch\_get\_main\_queue(), ^{

        \[self updateYUVFrameOnMainThread:(H264YUV\_Frame\*)&yuvFrame\];  
    });

    free(yuvFrame.luma.dataBuffer);  
    free(yuvFrame.chromaB.dataBuffer);  
    free(yuvFrame.chromaR.dataBuffer);

}  
av\_free\_packet(&pAvPackage);

return ;  

}