static void mxf_write_multi_descriptor(AVFormatContext *s) { MXFContext *mxf = s->priv_data; AVIOContext *pb = s->pb; const uint8_t *ul; int i; mxf_write_metadata_key(pb, 0x014400); PRINT_KEY(s, "multiple descriptor key", pb->buf_ptr - 16); klv_encode_ber_length(pb, 64 + 16 * s->nb_streams); mxf_write_local_tag(pb, 16, 0x3C0A); mxf_write_uuid(pb, MultipleDescriptor, 0); PRINT_KEY(s, "multi_desc uid", pb->buf_ptr - 16); // write sample rate mxf_write_local_tag(pb, 8, 0x3001); avio_wb32(pb, mxf->time_base.den); avio_wb32(pb, mxf->time_base.num); // write essence container ul mxf_write_local_tag(pb, 16, 0x3004); if (mxf->essence_container_count > 1) ul = multiple_desc_ul; else { MXFStreamContext *sc = s->streams[0]->priv_data; ul = mxf_essence_container_uls[sc->index].container_ul; } avio_write(pb, ul, 16); // write sub descriptor refs mxf_write_local_tag(pb, s->nb_streams * 16 + 8, 0x3F01); mxf_write_refs_count(pb, s->nb_streams); for (i = 0; i < s->nb_streams; i++) mxf_write_uuid(pb, SubDescriptor, i); }