- (int)DecodeH264Frames: (unsigned char*)inputBuffer withLength:(int)aLength {int gotPicPtr=0;int result=0;av_init_packet(&pAvPackage);pAvPackage.data=(unsigned char*)inputBuffer;pAvPackage.size=aLength;//解碼result=avcodec_decode_video2(pCodecCtx, pVideoFrame, &gotPicPtr, &pAvPackage);//如果視頻尺寸更改，我們丟掉這個frameif((pictureWidth!=0)&&(pictureWidth!=pCodecCtx->width)){setRecordResolveState=0;pictureWidth=pCodecCtx->width;return -1;}//YUV 420 Y U V -> RGBif(gotPicPtr){unsigned int lumaLength= (pCodecCtx->height)*(MIN(pVideoFrame->linesize[0], pCodecCtx->width));// W * Hunsigned int chromBLength=((pCodecCtx->height)/2)*(MIN(pVideoFrame->linesize[1], (pCodecCtx->width)/2));// w * h/4unsigned int chromRLength=((pCodecCtx->height)/2)*(MIN(pVideoFrame->linesize[2], (pCodecCtx->width)/2));H264YUV_Frame yuvFrame;memset(&yuvFrame, 0, 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[0],yuvFrame.luma.dataBuffer,pVideoFrame->linesize[0],pCodecCtx->width,pCodecCtx->height);copyDecodedFrame(pVideoFrame->data[1], yuvFrame.chromaB.dataBuffer,pVideoFrame->linesize[1],pCodecCtx->width / 2,pCodecCtx->height / 2);copyDecodedFrame(pVideoFrame->data[2], yuvFrame.chromaR.dataBuffer,pVideoFrame->linesize[2],pCodecCtx->width / 2,pCodecCtx->height / 2);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 0; }

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轉載于:https://www.cnblogs.com/-ljj/p/6373814.html

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