mpegts: demux synchronous SMPTE 336M Key-Length-Value (KLV) metadata

Fixes ticket #2579.

libavformat/mpegts.c

@@ -640,6 +640,11 @@ static const StreamType REGD_types[] = {
     { 0 },
 };
 
+static const StreamType METADATA_types[] = {
+    { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
+    { 0 },
+};
+
 /* descriptor present */
 static const StreamType DESC_types[] = {
     { 0x6a, AVMEDIA_TYPE_AUDIO,             AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
@@ -1002,6 +1007,12 @@ static int mpegts_push_data(MpegTSFilter *filter,
                     p += sl_header_bytes;
                     buf_size -= sl_header_bytes;
                 }
+                if (pes->stream_type == 0x15 && buf_size >= 5) {
+                    /* skip metadata access unit header */
+                    pes->pes_header_size += 5;
+                    p += 5;
+                    buf_size -= 5;
+                }
                 if (pes->ts->fix_teletext_pts && pes->st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT) {
                     AVProgram *p = NULL;
                     while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
@@ -1489,6 +1500,15 @@ int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type
     case 0x52: /* stream identifier descriptor */
         st->stream_identifier = 1 + get8(pp, desc_end);
         break;
+    case 0x26: /* metadata descriptor */
+        if (get16(pp, desc_end) == 0xFFFF)
+            *pp += 4;
+        if (get8(pp, desc_end) == 0xFF) {
+            st->codec->codec_tag = bytestream_get_le32(pp);
+            if (st->codec->codec_id == AV_CODEC_ID_NONE)
+                mpegts_find_stream_type(st, st->codec->codec_tag, METADATA_types);
+        }
+        break;
     default:
         break;
     }