lavf/movenc.c: Set sgpd and sbgp atoms to represent decoder delay for AAC.

According to https://developer.apple.com/library/content/documentation/QuickTime/QTFF/QTFFAppenG/QTFFAppenG.html and ISO-IEC-14496-12 Section 10.1.1.1 and 10.1.1.3
Signed-off-by: Sasi Inguva <isasi@google.com>
Reviewed-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/movenc.c

@@ -2208,14 +2208,16 @@ static int mov_preroll_write_stbl_atoms(AVIOContext *pb, MOVTrack *track)
                                     (AVRational){1, 1000},
                                     (AVRational){1, 48000});
 
-    if (track->entry) {
-        sgpd_entries = av_malloc_array(track->entry, sizeof(*sgpd_entries));
-        if (!sgpd_entries)
-            return AVERROR(ENOMEM);
-    }
+    if (!track->entry)
+        return 0;
 
-    av_assert0(track->par->codec_id == AV_CODEC_ID_OPUS);
+    sgpd_entries = av_malloc_array(track->entry, sizeof(*sgpd_entries));
+    if (!sgpd_entries)
+        return AVERROR(ENOMEM);
 
+    av_assert0(track->par->codec_id == AV_CODEC_ID_OPUS || track->par->codec_id == AV_CODEC_ID_AAC);
+
+    if (track->par->codec_id == AV_CODEC_ID_OPUS) {
     for (i = 0; i < track->entry; i++) {
         int roll_samples_remaining = roll_samples;
         int distance = 0;
@@ -2242,6 +2244,12 @@ static int mov_preroll_write_stbl_atoms(AVIOContext *pb, MOVTrack *track)
             sgpd_entries[entries].group_description_index = distance ? ++group : 0;
         }
     }
+    } else {
+        entries++;
+        sgpd_entries[entries].count = track->sample_count;
+        sgpd_entries[entries].roll_distance = 1;
+        sgpd_entries[entries].group_description_index = ++group;
+    }
     entries++;
 
     if (!group) {
@@ -2304,7 +2312,7 @@ static int mov_write_stbl_tag(AVFormatContext *s, AVIOContext *pb, MOVMuxContext
     if (track->cenc.aes_ctr) {
         ff_mov_cenc_write_stbl_atoms(&track->cenc, pb);
     }
-    if (track->par->codec_id == AV_CODEC_ID_OPUS) {
+    if (track->par->codec_id == AV_CODEC_ID_OPUS || track->par->codec_id == AV_CODEC_ID_AAC) {
         mov_preroll_write_stbl_atoms(pb, track);
     }
     return update_size(pb, pos);

tests/ref/fate/adtstoasc_ticket3715

-ef8ce3cbd1d86113e7c991a816086068 *tests/data/fate/adtstoasc_ticket3715.mov
-33270 tests/data/fate/adtstoasc_ticket3715.mov
+0221e04333e6ac432fa42960502f0d5a *tests/data/fate/adtstoasc_ticket3715.mov
+33324 tests/data/fate/adtstoasc_ticket3715.mov
 #extradata 0:        2, 0x00340022
 #tb 0: 1/44100
 #media_type 0: audio

tests/ref/fate/copy-psp

-6889223644fc560069c8591984175a62 *tests/data/fate/copy-psp.psp
-2041379 tests/data/fate/copy-psp.psp
+cada61453a2483ef8ba1fb82c8bbff25 *tests/data/fate/copy-psp.psp
+2041433 tests/data/fate/copy-psp.psp
 #extradata 0:       51, 0xaf6d1012
 #extradata 1:        2, 0x00b200a1
 #tb 0: 1/90000

tests/ref/fate/movenc

 write_data len 36, time nopts, type header atom ftyp
-write_data len 2335, time nopts, type header atom -
+write_data len 2389, time nopts, type header atom -
 write_data len 788, time 1000000, type sync atom moof
 write_data len 110, time nopts, type trailer atom -
-214242e9c7c93171d2f47f5b47776559 3269 non-empty-moov
+17a37691eba8b858cf15e60aa9a7dbf7 3323 non-empty-moov
 write_data len 36, time nopts, type header atom ftyp
-write_data len 2667, time nopts, type header atom -
+write_data len 2721, time nopts, type header atom -
 write_data len 908, time 966667, type sync atom moof
 write_data len 110, time nopts, type trailer atom -
-44467d568a3cc38d414fd8ed4b2a968f 3721 non-empty-moov-elst
+0026ffe059c06c592021f972bf2c5e79 3775 non-empty-moov-elst
 write_data len 36, time nopts, type header atom ftyp
-write_data len 2575, time nopts, type header atom -
+write_data len 2629, time nopts, type header atom -
 write_data len 908, time 1000000, type sync atom moof
 write_data len 110, time nopts, type trailer atom -
-de22b98a3885f9b4b83cdd48ff46aeb9 3629 non-empty-moov-no-elst
+c184e168ac1e5bb3d9c70e580ab6179c 3683 non-empty-moov-no-elst
 write_data len 20, time nopts, type header atom ftyp
 write_data len 1171, time nopts, type header atom -
 write_data len 728, time 0, type sync atom moof