sws_get_class     553 cmdutils.c         sc = sws_get_class();
sws_get_class    2689 ffmpeg_opt.c           show_help_children(sws_get_class(), flags);
sws_get_class    3741 ffplay.c           show_help_children(sws_get_class(), AV_OPT_FLAG_ENCODING_PARAM);
sws_get_class     151 libavfilter/vf_scale.c         const AVClass *class = sws_get_class();
sws_get_class     546 libavfilter/vf_scale.c     return prev ? NULL : sws_get_class();
sws_get_class     353 libswscale/swscale.h const AVClass *sws_get_class(void);