vaapi_map_frame   885 libavutil/hwcontext_vaapi.c     err = vaapi_map_frame(hwfc, map, src, AV_HWFRAME_MAP_READ);
vaapi_map_frame   916 libavutil/hwcontext_vaapi.c     err = vaapi_map_frame(hwfc, map, dst, AV_HWFRAME_MAP_WRITE | AV_HWFRAME_MAP_OVERWRITE);
vaapi_map_frame   944 libavutil/hwcontext_vaapi.c     err = vaapi_map_frame(hwfc, dst, src, flags);