avformat/movenc: fix recognization of cover image streams

For chapter images, the mov demux produces streams with disposition set
to attached_pic+timed_thumbnails. This patch fixes to properly recognize
streams that should be encoded as cover image (ones with only and only
attached_pic disposition set).
Signed-off-by: Timo Teräs <timo.teras@iki.fi>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/movenc.c

@@ -143,10 +143,17 @@ static int co64_required(const MOVTrack *track)
     return 0;
 }
 
+static int is_cover_image(const AVStream *st)
+{
+    /* Eg. AV_DISPOSITION_ATTACHED_PIC | AV_DISPOSITION_TIMED_THUMBNAILS
+     * is encoded as sparse video track */
+    return st && st->disposition == AV_DISPOSITION_ATTACHED_PIC;
+}
+
 static int rtp_hinting_needed(const AVStream *st)
 {
     /* Add hint tracks for each real audio and video stream */
-    if (st->disposition & AV_DISPOSITION_ATTACHED_PIC)
+    if (is_cover_image(st))
         return 0;
     return st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO ||
            st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO;
@@ -1568,7 +1575,7 @@ static int mov_find_codec_tag(AVFormatContext *s, MOVTrack *track)
 {
     int tag;
 
-    if (track->st->disposition & AV_DISPOSITION_ATTACHED_PIC)
+    if (is_cover_image(track->st))
         return ff_codec_get_tag(codec_cover_image_tags, track->par->codec_id);
 
     if (track->mode == MODE_MP4 || track->mode == MODE_PSP)
@@ -3443,10 +3450,8 @@ static int mov_write_covr(AVIOContext *pb, AVFormatContext *s)
 
     for (i = 0; i < s->nb_streams; i++) {
         MOVTrack *trk = &mov->tracks[i];
-        AVStream *st = s->streams[i];
 
-        if (!(st->disposition & AV_DISPOSITION_ATTACHED_PIC) ||
-            trk->cover_image.size <= 0)
+        if (!is_cover_image(trk->st) || trk->cover_image.size <= 0)
             continue;
 
         if (!pos) {
@@ -3989,15 +3994,13 @@ static int mov_write_isml_manifest(AVIOContext *pb, MOVMuxContext *mov, AVFormat
         AVStream *st = track->st;
         AVDictionaryEntry *lang = av_dict_get(st->metadata, "language", NULL,0);
 
-        if (track->par->codec_type == AVMEDIA_TYPE_VIDEO) {
+        if (track->par->codec_type == AVMEDIA_TYPE_VIDEO && !is_cover_image(st)) {
             type = "video";
         } else if (track->par->codec_type == AVMEDIA_TYPE_AUDIO) {
             type = "audio";
         } else {
             continue;
         }
-        if (st->disposition & AV_DISPOSITION_ATTACHED_PIC)
-            continue;
 
         props = (AVCPBProperties*)av_stream_get_side_data(track->st, AV_PKT_DATA_CPB_PROPERTIES, NULL);
 
@@ -4657,7 +4660,7 @@ static int mov_write_ftyp_tag(AVIOContext *pb, AVFormatContext *s)
 
     for (i = 0; i < s->nb_streams; i++) {
         AVStream *st = s->streams[i];
-        if (st->disposition & AV_DISPOSITION_ATTACHED_PIC)
+        if (is_cover_image(st))
             continue;
         if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
             has_video = 1;
@@ -4807,7 +4810,7 @@ static int mov_write_identification(AVIOContext *pb, AVFormatContext *s)
         int video_streams_nb = 0, audio_streams_nb = 0, other_streams_nb = 0;
         for (i = 0; i < s->nb_streams; i++) {
             AVStream *st = s->streams[i];
-            if (st->disposition & AV_DISPOSITION_ATTACHED_PIC)
+            if (is_cover_image(st))
                 continue;
             if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
                 video_streams_nb++;
@@ -4998,8 +5001,7 @@ static int mov_flush_fragment(AVFormatContext *s, int force)
         int buf_size, moov_size;
 
         for (i = 0; i < mov->nb_streams; i++)
-            if (!mov->tracks[i].entry &&
-                (i >= s->nb_streams || !(s->streams[i]->disposition & AV_DISPOSITION_ATTACHED_PIC)))
+            if (!mov->tracks[i].entry && !is_cover_image(mov->tracks[i].st))
                 break;
         /* Don't write the initial moov unless all tracks have data */
         if (i < mov->nb_streams && !force)
@@ -5581,21 +5583,19 @@ static int mov_write_packet(AVFormatContext *s, AVPacket *pkt)
 {
     MOVMuxContext *mov = s->priv_data;
     MOVTrack *trk;
-    AVStream *st;
 
     if (!pkt) {
         mov_flush_fragment(s, 1);
         return 1;
     }
 
-    st = s->streams[pkt->stream_index];
     trk = &mov->tracks[pkt->stream_index];
 
-    if (st->disposition & AV_DISPOSITION_ATTACHED_PIC) {
+    if (is_cover_image(trk->st)) {
         int ret;
 
-        if (st->nb_frames >= 1) {
-            if (st->nb_frames == 1)
+        if (trk->st->nb_frames >= 1) {
+            if (trk->st->nb_frames == 1)
                 av_log(s, AV_LOG_WARNING, "Got more than one picture in stream %d,"
                        " ignoring.\n", pkt->stream_index);
             return 0;
@@ -5854,7 +5854,7 @@ static void enable_tracks(AVFormatContext *s)
 
         if (st->codecpar->codec_type <= AVMEDIA_TYPE_UNKNOWN ||
             st->codecpar->codec_type >= AVMEDIA_TYPE_NB ||
-            st->disposition & AV_DISPOSITION_ATTACHED_PIC)
+            is_cover_image(st))
             continue;
 
         if (first[st->codecpar->codec_type] < 0)