ff_sws_init_range_convert  576 libswscale/swscale.c     ff_sws_init_range_convert(c);
ff_sws_init_range_convert  638 libswscale/swscale_internal.h av_cold void ff_sws_init_range_convert(SwsContext *c);
ff_sws_init_range_convert  904 libswscale/utils.c         ff_sws_init_range_convert(c);