mov: set audio service type for AC-3 from bitstream mode in the 'dac3' atom.

libavformat/mov.c

@@ -492,16 +492,20 @@ static int mov_read_esds(MOVContext *c, AVIOContext *pb, MOVAtom atom)
 static int mov_read_dac3(MOVContext *c, AVIOContext *pb, MOVAtom atom)
 {
     AVStream *st;
-    int ac3info, acmod, lfeon;
+    int ac3info, acmod, lfeon, bsmod;
 
     if (c->fc->nb_streams < 1)
         return 0;
     st = c->fc->streams[c->fc->nb_streams-1];
 
     ac3info = avio_rb24(pb);
+    bsmod = (ac3info >> 14) & 0x7;
     acmod = (ac3info >> 11) & 0x7;
     lfeon = (ac3info >> 10) & 0x1;
     st->codec->channels = ((int[]){2,1,2,3,3,4,4,5})[acmod] + lfeon;
+    st->codec->audio_service_type = bsmod;
+    if (st->codec->channels > 1 && bsmod == 0x7)
+        st->codec->audio_service_type = AV_AUDIO_SERVICE_TYPE_KARAOKE;
 
     return 0;
 }