Quoting Nicolas George (2023-01-30 13:59:44) > > +static unsigned > > +find_linklabel(AVFilterGraphSegment *seg, const char *label, > > + int output, size_t idx_chain, size_t idx_filter, > > + AVFilterParams **pp) > > +{ > > + for (; idx_chain < seg->nb_chains; idx_chain++) { > > + AVFilterChain *ch = seg->chains[idx_chain]; > > + > > + for (; idx_filter < ch->nb_filters; idx_filter++) { > > + AVFilterParams *p = ch->filters[idx_filter]; > > + AVFilterPadParams **io = output ? p->outputs : p->inputs; > > + unsigned nb_io = output ? p->nb_outputs : p->nb_inputs; > > + AVFilterLink **l; > > + unsigned nb_l; > > + > > + if (!p->filter) > > + continue; > > + > > + l = output ? p->filter->outputs : p->filter->inputs; > > + nb_l = output ? p->filter->nb_outputs : p->filter->nb_inputs; > > + > > + for (unsigned i = 0; i < FFMIN(nb_io, nb_l); i++) > > + if (!l[i] && io[i]->label && !strcmp(io[i]->label, label)) > > { > > + *pp = p; > > + return i; > > + } > > + } > > + > > + idx_filter = 0; > > + } > > + > > + *pp = NULL; > > + return 0; > > +} > > If I read this code correctly, it will only find link labels that are > defined later in the chain or in a later chain. But referring to earlier > link labels is supported. Even cycles are meant to be supported at > parsing level (format negotiation will likely fail, though, but being > able to make cycles was a goal from the start).
The earlier filters have already been processed at this point, so if an earlier filter had a link label that would match this one, then it's already been linked. So there's no point in considering earlier filters. -- Anton Khirnov _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".