ff_ebur128_set_channel  742 libavfilter/af_loudnorm.c         ff_ebur128_set_channel(s->r128_in,  0, FF_EBUR128_DUAL_MONO);
ff_ebur128_set_channel  743 libavfilter/af_loudnorm.c         ff_ebur128_set_channel(s->r128_out, 0, FF_EBUR128_DUAL_MONO);
ff_ebur128_set_channel  145 libavfilter/ebur128.h int ff_ebur128_set_channel(FFEBUR128State * st,