FFmpegh.264解码

- (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 ;
}