- err = ff_cbs_write_packet(ctx->cbc, out, frag);
- if (err < 0) {
- av_log(bsf, AV_LOG_ERROR, "Failed to write packet.\n");
- goto fail;
- }
-
- err = av_packet_copy_props(out, in);
- if (err < 0)
- goto fail;
-
- err = 0;
-fail:
- ff_cbs_fragment_uninit(ctx->cbc, frag);
-
- if (err < 0)
- av_packet_unref(out);
- av_packet_free(&in);
-
- return err;
-}
-
-static int av1_metadata_init(AVBSFContext *bsf)
-{
- AV1MetadataContext *ctx = bsf->priv_data;
- CodedBitstreamFragment *frag = &ctx->access_unit;
- AV1RawOBU *obu;
- int err, i;
-
- err = ff_cbs_init(&ctx->cbc, AV_CODEC_ID_AV1, bsf);
- if (err < 0)
- return err;
-
- if (bsf->par_in->extradata) {
- err = ff_cbs_read_extradata(ctx->cbc, frag, bsf->par_in);
+ // If a Temporal Delimiter is present, it must be the first OBU.
+ if (frag->nb_units && frag->units[0].type == AV1_OBU_TEMPORAL_DELIMITER) {
+ if (ctx->td == BSF_ELEMENT_REMOVE)
+ ff_cbs_delete_unit(frag, 0);
+ } else if (pkt && ctx->td == BSF_ELEMENT_INSERT) {
+ td = (AV1RawOBU) {
+ .header.obu_type = AV1_OBU_TEMPORAL_DELIMITER,
+ };
+
+ err = ff_cbs_insert_unit_content(frag, 0, AV1_OBU_TEMPORAL_DELIMITER,
+ &td, NULL);