change the logic to mux 13818-3 and 11172-3 in mp4, less code

Originally committed as revision 15190 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/isom.c

@@ -40,10 +40,10 @@ const AVCodecTag ff_mp4_obj_type[] = {
     { CODEC_ID_AAC       , 0x66 }, /* MPEG2 AAC Main */
     { CODEC_ID_AAC       , 0x67 }, /* MPEG2 AAC Low */
     { CODEC_ID_AAC       , 0x68 }, /* MPEG2 AAC SSR */
+    { CODEC_ID_MP3       , 0x69 }, /* 13818-3 */
+    { CODEC_ID_MP2       , 0x69 }, /* 11172-3 */
     { CODEC_ID_MPEG1VIDEO, 0x6A }, /* 11172-2 */
     { CODEC_ID_MP3       , 0x6B }, /* 11172-3 */
-    { CODEC_ID_MP2       , 0x6B }, /* 11172-3 */
-    { CODEC_ID_MP3       , 0x69 }, /* 13818-3 */
     { CODEC_ID_MJPEG     , 0x6C }, /* 10918-1 */
     { CODEC_ID_PNG       , 0x6D },
     { CODEC_ID_JPEG2000  , 0x6E }, /* 15444-1 */

libavformat/movenc.c

@@ -319,9 +319,8 @@ static int mov_write_esds_tag(ByteIOContext *pb, MOVTrack *track) // Basic
     // Object type indication
     if ((track->enc->codec_id == CODEC_ID_MP2 ||
          track->enc->codec_id == CODEC_ID_MP3) &&
-        track->enc->sample_rate <= 24000 &&
-        track->enc->sample_rate >= 16000)
-        put_byte(pb, 105); // 13818-3
+        track->enc->sample_rate > 24000)
+        put_byte(pb, 0x6B); // 11172-3
     else
         put_byte(pb, codec_get_tag(ff_mp4_obj_type, track->enc->codec_id));