+int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
+ const uint8_t **pp, const uint8_t *desc_list_end,
+ int mp4_dec_config_descr_len, int mp4_es_id, int pid,
+ uint8_t *mp4_dec_config_descr)
+{
+ const uint8_t *desc_end;
+ int desc_len, desc_tag;
+ char language[252];
+ int i;
+
+ desc_tag = get8(pp, desc_list_end);
+ if (desc_tag < 0)
+ return -1;
+ desc_len = get8(pp, desc_list_end);
+ if (desc_len < 0)
+ return -1;
+ desc_end = *pp + desc_len;
+ if (desc_end > desc_list_end)
+ return -1;
+
+ av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
+
+ if (st->codec->codec_id == CODEC_ID_NONE &&
+ stream_type == STREAM_TYPE_PRIVATE_DATA)
+ mpegts_find_stream_type(st, desc_tag, DESC_types);
+
+ switch(desc_tag) {
+ case 0x1F: /* FMC descriptor */
+ get16(pp, desc_end);
+ if (st->codec->codec_id == CODEC_ID_AAC_LATM &&
+ mp4_dec_config_descr_len && mp4_es_id == pid) {
+ AVIOContext pb;
+ ffio_init_context(&pb, mp4_dec_config_descr,
+ mp4_dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
+ ff_mp4_read_dec_config_descr(fc, st, &pb);
+ if (st->codec->codec_id == CODEC_ID_AAC &&
+ st->codec->extradata_size > 0)
+ st->need_parsing = 0;
+ }
+ break;
+ case 0x56: /* DVB teletext descriptor */
+ language[0] = get8(pp, desc_end);
+ language[1] = get8(pp, desc_end);
+ language[2] = get8(pp, desc_end);
+ language[3] = 0;
+ av_metadata_set2(&st->metadata, "language", language, 0);
+ break;
+ case 0x59: /* subtitling descriptor */
+ language[0] = get8(pp, desc_end);
+ language[1] = get8(pp, desc_end);
+ language[2] = get8(pp, desc_end);
+ language[3] = 0;
+ /* hearing impaired subtitles detection */
+ switch(get8(pp, desc_end)) {
+ case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
+ case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
+ case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
+ case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
+ case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
+ case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
+ st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
+ break;
+ }
+ if (st->codec->extradata) {
+ if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
+ av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
+ } else {
+ st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
+ if (st->codec->extradata) {
+ st->codec->extradata_size = 4;
+ memcpy(st->codec->extradata, *pp, 4);
+ }
+ }
+ *pp += 4;
+ av_metadata_set2(&st->metadata, "language", language, 0);
+ break;
+ case 0x0a: /* ISO 639 language descriptor */
+ for (i = 0; i + 4 <= desc_len; i += 4) {
+ language[i + 0] = get8(pp, desc_end);
+ language[i + 1] = get8(pp, desc_end);
+ language[i + 2] = get8(pp, desc_end);
+ language[i + 3] = ',';
+ switch (get8(pp, desc_end)) {
+ case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
+ case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
+ case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
+ }
+ }
+ if (i) {
+ language[i - 1] = 0;
+ av_metadata_set2(&st->metadata, "language", language, 0);
+ }
+ break;
+ case 0x05: /* registration descriptor */
+ st->codec->codec_tag = bytestream_get_le32(pp);
+ av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
+ if (st->codec->codec_id == CODEC_ID_NONE &&
+ stream_type == STREAM_TYPE_PRIVATE_DATA)
+ mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
+ break;
+ default:
+ break;
+ }
+ *pp = desc_end;
+ return 0;
+}
+