mov: use tkhd enabled flag to set the default track

Signed-off-by: Anton Khirnov <anton@khirnov.net>

libavformat/isom.h

@@ -190,6 +190,11 @@ void ff_mp4_parse_es_descr(AVIOContext *pb, int *es_id);
 #define MOV_FRAG_SAMPLE_FLAG_DEPENDS_NO                0x02000000
 #define MOV_FRAG_SAMPLE_FLAG_DEPENDS_YES               0x01000000
 
+#define MOV_TKHD_FLAG_ENABLED       0x0001
+#define MOV_TKHD_FLAG_IN_MOVIE      0x0002
+#define MOV_TKHD_FLAG_IN_PREVIEW    0x0004
+#define MOV_TKHD_FLAG_IN_POSTER     0x0008
+
 int ff_mov_read_esds(AVFormatContext *fc, AVIOContext *pb, MOVAtom atom);
 enum AVCodecID ff_mov_get_lpcm_codec_id(int bps, int flags);
 

libavformat/mov.c

@@ -2125,6 +2125,7 @@ static int mov_read_tkhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
     AVStream *st;
     MOVStreamContext *sc;
     int version;
+    int flags;
 
     if (c->fc->nb_streams < 1)
         return 0;
@@ -2132,13 +2133,8 @@ static int mov_read_tkhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
     sc = st->priv_data;
 
     version = avio_r8(pb);
-    avio_rb24(pb); /* flags */
-    /*
-    MOV_TRACK_ENABLED 0x0001
-    MOV_TRACK_IN_MOVIE 0x0002
-    MOV_TRACK_IN_PREVIEW 0x0004
-    MOV_TRACK_IN_POSTER 0x0008
-    */
+    flags = avio_rb24(pb);
+    st->disposition |= (flags & MOV_TKHD_FLAG_ENABLED) ? AV_DISPOSITION_DEFAULT : 0;
 
     if (version == 1) {
         avio_rb64(pb);