swri_dither_init  328 libswresample/swresample.c     if ((ret = swri_dither_init(s, s->out_sample_fmt, s->int_sample_fmt)) < 0)
swri_dither_init  190 libswresample/swresample_internal.h int swri_dither_init(SwrContext *s, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt);