avformat/matroskaenc: Use random TrackUID

Up until now, the TrackUID of a Matroska track which is supposed to be
random was not random at all: It always coincided with the TrackNumber
which is usually the 1-based index of the corresponding stream in the
array of AVStreams. This has been changed: It is now set via an AVLFG
if AVFMT_FLAG_BITEXACT is not set. Otherwise it is set like it is set
now (the only change happens if an explicit track number has been
chosen via dash_track_number, because the system used in the normal
situation is now used, too). In particular, no FATE tests need to be
updated.

This also fixes a bug in case the dash_track_number option was used:
In this case the TrackUID was set to the provided number, but the tags
were written with a TagTrackUID simply based upon the index, so that
the tags didn't apply to the track they ought to apply to.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

libavformat/matroskaenc.c

@@ -93,6 +93,7 @@ typedef struct mkv_cues {
 typedef struct mkv_track {
     int             write_dts;
     int             has_cue;
+    uint64_t        uid;
     int             sample_rate;
     int64_t         sample_rate_offset;
     int64_t         last_timestamp;
@@ -1115,8 +1116,7 @@ static int mkv_write_track(AVFormatContext *s, MatroskaMuxContext *mkv,
     track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
     put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER,
                    mkv->is_dash ? mkv->dash_track_number : i + 1);
-    put_ebml_uint (pb, MATROSKA_ID_TRACKUID,
-                   mkv->is_dash ? mkv->dash_track_number : i + 1);
+    put_ebml_uint (pb, MATROSKA_ID_TRACKUID, mkv->tracks[i].uid);
     put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0);    // no lacing (yet)
 
     if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
@@ -1569,6 +1569,7 @@ static int mkv_write_tags(AVFormatContext *s)
     tagp = (s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live ? &tag : NULL;
     for (i = 0; i < s->nb_streams; i++) {
         AVStream *st = s->streams[i];
+        mkv_track *track = &mkv->tracks[i];
 
         if (st->codecpar->codec_type == AVMEDIA_TYPE_ATTACHMENT)
             continue;
@@ -1577,7 +1578,7 @@ static int mkv_write_tags(AVFormatContext *s)
             continue;
 
         ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID,
-                            i + 1, tagp);
+                            track->uid, tagp);
         if (ret < 0) return ret;
 
         if (tagp) {
@@ -1783,10 +1784,6 @@ static int mkv_write_header(AVFormatContext *s)
             version = 4;
     }
 
-    mkv->tracks = av_mallocz_array(s->nb_streams, sizeof(*mkv->tracks));
-    if (!mkv->tracks) {
-        return AVERROR(ENOMEM);
-    }
     ebml_header = start_ebml_master(pb, EBML_ID_HEADER, MAX_EBML_HEADER_SIZE);
     put_ebml_uint  (pb, EBML_ID_EBMLVERSION       ,           1);
     put_ebml_uint  (pb, EBML_ID_EBMLREADVERSION   ,           1);
@@ -2607,8 +2604,28 @@ static int webm_query_codec(enum AVCodecID codec_id, int std_compliance)
     return 0;
 }
 
+static uint64_t mkv_get_uid(const mkv_track *tracks, int i, AVLFG *c)
+{
+    while (1) {
+        uint64_t uid;
+        int k;
+        uid  = (uint64_t)av_lfg_get(c) << 32;
+        uid |= av_lfg_get(c);
+        if (!uid)
+            continue;
+        for (k = 0; k < i; k++) {
+            if (tracks[k].uid == uid)
+                break;
+        }
+        if (k == i)
+            return uid;
+    }
+}
+
 static int mkv_init(struct AVFormatContext *s)
 {
+    MatroskaMuxContext *mkv = s->priv_data;
+    AVLFG c;
     int i;
 
     if (s->nb_streams > MAX_TRACKS) {
@@ -2637,7 +2654,23 @@ static int mkv_init(struct AVFormatContext *s)
         s->internal->avoid_negative_ts_use_pts = 1;
     }
 
+    mkv->tracks = av_mallocz_array(s->nb_streams, sizeof(*mkv->tracks));
+    if (!mkv->tracks) {
+        return AVERROR(ENOMEM);
+    }
+
+    if (!(s->flags & AVFMT_FLAG_BITEXACT))
+        av_lfg_init(&c, av_get_random_seed());
+
     for (i = 0; i < s->nb_streams; i++) {
+        mkv_track *track = &mkv->tracks[i];
+
+        if (s->flags & AVFMT_FLAG_BITEXACT) {
+            track->uid = i + 1;
+        } else {
+            track->uid = mkv_get_uid(mkv->tracks, i, &c);
+        }
+
         // ms precision is the de-facto standard timescale for mkv files
         avpriv_set_pts_info(s->streams[i], 64, 1, 1000);
     }