ffmpeg中最简单的AVFrame转cv::Mat函数 c++_简单av

具体来源不知道了，直接给函数吧

  void avframeToMat(const AVFrame * frame, cv::Mat& image)
  {
    int width = frame->width;
    int height = frame->height;

    // Allocate the opencv mat and store its stride in a 1-element array
    if (image.rows != height || image.cols != width || image.type() != CV_8UC3) image = cv::Mat(height, width, CV_8UC3);
    int cvLinesizes[1];
    cvLinesizes[0] = image.step1();

    // Convert the colour format and write directly to the opencv matrix
    SwsContext* conversion = sws_getContext(width, height, (AVPixelFormat) frame->format, width, height, AVPixelFormat::AV_PIX_FMT_BGR24, SWS_FAST_BILINEAR, NULL, NULL, NULL);
    sws_scale(conversion, frame->data, frame->linesize, 0, height, &image.data, cvLinesizes);
    sws_freeContext(conversion);

  }

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