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Pass the composition and ancillary ID for DVB subtitles via extradata instead
of sub_id, this allows detecting when that information is not available and just decode everything. In addition extradata is required for many codecs and thus in contrast to sub_id generally already passed on by any programs using libav*. Also ask for a sample if we encounter a stream with multiple/changing IDs. Originally committed as revision 24238 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -358,8 +358,14 @@ static av_cold int dvbsub_init_decoder(AVCodecContext *avctx)
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int i, r, g, b, a = 0;
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DVBSubContext *ctx = avctx->priv_data;
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ctx->composition_id = avctx->sub_id & 0xffff;
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ctx->ancillary_id = avctx->sub_id >> 16;
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if (!avctx->extradata || avctx->extradata_size != 4) {
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av_log(avctx, AV_LOG_WARNING, "Invalid extradata, subtitle streams may be combined!\n");
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ctx->composition_id = -1;
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ctx->ancillary_id = -1;
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} else {
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ctx->composition_id = AV_RB16(avctx->extradata);
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ctx->ancillary_id = AV_RB16(avctx->extradata + 2);
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}
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default_clut.id = -1;
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default_clut.next = NULL;
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@ -1434,7 +1440,8 @@ static int dvbsub_decode(AVCodecContext *avctx,
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segment_length = AV_RB16(p);
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p += 2;
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if (page_id == ctx->composition_id || page_id == ctx->ancillary_id) {
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if (page_id == ctx->composition_id || page_id == ctx->ancillary_id ||
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ctx->composition_id == -1 || ctx->ancillary_id == -1) {
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switch (segment_type) {
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case DVBSUB_PAGE_SEGMENT:
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dvbsub_parse_page_segment(avctx, p, segment_length);
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@ -860,7 +860,6 @@ static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len
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const uint8_t *p, *p_end, *desc_list_end, *desc_end;
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int program_info_length, pcr_pid, pid, stream_type;
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int desc_list_len, desc_len, desc_tag;
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int comp_page, anc_page;
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char language[4];
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uint32_t prog_reg_desc = 0; /* registration descriptor */
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@ -981,9 +980,17 @@ static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len
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language[2] = get8(&p, desc_end);
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language[3] = 0;
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get8(&p, desc_end);
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comp_page = get16(&p, desc_end);
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anc_page = get16(&p, desc_end);
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st->codec->sub_id = (anc_page << 16) | comp_page;
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if (st->codec->extradata) {
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if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, p, 4))
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av_log_ask_for_sample(ts->stream, "DVB sub with multiple IDs\n");
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} else {
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st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
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if (st->codec->extradata) {
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st->codec->extradata_size = 4;
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memcpy(st->codec->extradata, p, 4);
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}
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}
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p += 4;
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av_metadata_set2(&st->metadata, "language", language, 0);
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break;
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case 0x0a: /* ISO 639 language descriptor */
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