/usr/include/ffmpeg/libavutil/imgutils.h
159:int av_image_get_buffer_size(enum AVPixelFormat pix_fmt, int width, int height, int align);
164: * av_image_get_buffer_size() can be used to compute the required size

/usr/include/ffmpeg/libavcodec/avcodec.h
4823: * @see av_image_get_buffer_size().