-#if FF_API_CHILD_CLASS_NEXT
-static const AVClass *format_child_class_next(const AVClass *prev)
-{
- const AVInputFormat *ifmt = NULL;
- const AVOutputFormat *ofmt = NULL;
- void *ifmt_iter = NULL, *ofmt_iter = NULL;
-
- if (!prev)
- return &ff_avio_class;
-
- while ((ifmt = av_demuxer_iterate(&ifmt_iter)))
- if (ifmt->priv_class == prev)
- break;
-
- if (!ifmt) {
- ifmt_iter = NULL;
- while ((ofmt = av_muxer_iterate(&ofmt_iter)))
- if (ofmt->priv_class == prev)
- break;
- }
- if (!ofmt) {
- ofmt_iter = NULL;
- while ((ifmt = av_demuxer_iterate(&ifmt_iter)))
- if (ifmt->priv_class)
- return ifmt->priv_class;
- }
-
- while ((ofmt = av_muxer_iterate(&ofmt_iter)))
- if (ofmt->priv_class)
- return ofmt->priv_class;
-
- return NULL;
-}
-#endif
-