avformat/mov: parse rtmd track timecode

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavformat/mov.c

@@ -4676,6 +4676,31 @@ static int parse_timecode_in_framenum_format(AVFormatContext *s, AVStream *st,
     return 0;
 }
 
+static int mov_read_rtmd_track(AVFormatContext *s, AVStream *st)
+{
+    MOVStreamContext *sc = st->priv_data;
+    char buf[AV_TIMECODE_STR_SIZE];
+    int64_t cur_pos = avio_tell(sc->pb);
+    int hh, mm, ss, ff, drop;
+
+    if (!st->nb_index_entries)
+        return -1;
+
+    avio_seek(sc->pb, st->index_entries->pos, SEEK_SET);
+    avio_skip(s->pb, 13);
+    hh = avio_r8(s->pb);
+    mm = avio_r8(s->pb);
+    ss = avio_r8(s->pb);
+    drop = avio_r8(s->pb);
+    ff = avio_r8(s->pb);
+    snprintf(buf, AV_TIMECODE_STR_SIZE, "%02d:%02d:%02d%c%02d",
+             hh, mm, ss, drop ? ';' : ':', ff);
+    av_dict_set(&st->metadata, "timecode", buf, 0);
+
+    avio_seek(sc->pb, cur_pos, SEEK_SET);
+    return 0;
+}
+
 static int mov_read_timecode_track(AVFormatContext *s, AVStream *st)
 {
     MOVStreamContext *sc = st->priv_data;
@@ -4954,8 +4979,11 @@ static int mov_read_header(AVFormatContext *s)
         if (mov->chapter_track > 0 && !mov->ignore_chapters)
             mov_read_chapters(s);
         for (i = 0; i < s->nb_streams; i++)
-            if (s->streams[i]->codecpar->codec_tag == AV_RL32("tmcd"))
+            if (s->streams[i]->codecpar->codec_tag == AV_RL32("tmcd")) {
                 mov_read_timecode_track(s, s->streams[i]);
+            } else if (s->streams[i]->codecpar->codec_tag == AV_RL32("rtmd")) {
+                mov_read_rtmd_track(s, s->streams[i]);
+            }
     }
 
     /* copy timecode metadata from tmcd tracks to the related video streams */