av_get_extended_channel_layout   77 libavfilter/af_channelsplit.c         if ((ret = av_get_extended_channel_layout(s->channels_str, &channel_layout, &nb_channels)) < 0)
av_get_extended_channel_layout  700 libavfilter/formats.c     if (av_get_extended_channel_layout(arg, &chlayout, &nb_channels) < 0) {
av_get_extended_channel_layout  156 libavutil/channel_layout.h int av_get_extended_channel_layout(const char *name, uint64_t* channel_layout, int* nb_channels);