[FFmpeg-cvslog] Use QT format for audio sample descriptors depending on stsd version.

[Justin Ruggles]

ffmpeg | branch: master | Justin Ruggles <justin.ruggles at gmail.com> | Wed Sep  5 17:54:57 2018 -0400| [d2047c14c0789ce3059b840472fb96fd8bd854a9] | committer: Derek Buitenhuis

Use QT format for audio sample descriptors depending on stsd version.

ISOBMFF does not allow AudioSampleEntryV1 in stsd version 0, so
assume the descriptor format is QTFF SoundDescriptionV1. ISOBMFF does
not define a version 2.

This fixes audio decoding for some MP4 files generated with Apple
tools. The additional fields present in SoundDescriptionV1/V2 need to
be read in order to correctly read additional boxes that contain
information required for decoding the stream.

Fixes #7376.

Also see: https://github.com/HandBrake/HandBrake/issues/1555

Signed-off-by: Derek Buitenhuis <derek.buitenhuis at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=d2047c14c0789ce3059b840472fb96fd8bd854a9
---

 libavformat/isom.h | 1 +
 libavformat/mov.c  | 6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/libavformat/isom.h b/libavformat/isom.h
index f3a7a8633d..e629663949 100644
--- a/libavformat/isom.h
+++ b/libavformat/isom.h
@@ -218,6 +218,7 @@ typedef struct MOVStreamContext {
     int *extradata_size;
     int last_stsd_index;
     int stsd_count;
+    int stsd_version;
 
     int32_t *display_matrix;
     AVStereo3D *stereo3d;
diff --git a/libavformat/mov.c b/libavformat/mov.c
index 02c8ec66ed..ec57a05803 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -2122,8 +2122,8 @@ static void mov_parse_stsd_audio(MOVContext *c, AVIOContext *pb,
     // Read QT version 1 fields. In version 0 these do not exist.
     av_log(c->fc, AV_LOG_TRACE, "version =%d, isom =%d\n", version, c->isom);
     if (!c->isom ||
-        (compatible_brands && strstr(compatible_brands->value, "qt  "))) {
-
+        (compatible_brands && strstr(compatible_brands->value, "qt  ")) ||
+        (sc->stsd_version == 0 && version > 0)) {
         if (version == 1) {
             sc->samples_per_frame = avio_rb32(pb);
             avio_rb32(pb); /* bytes per packet */
@@ -2554,7 +2554,7 @@ static int mov_read_stsd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
     st = c->fc->streams[c->fc->nb_streams - 1];
     sc = st->priv_data;
 
-    avio_r8(pb); /* version */
+    sc->stsd_version = avio_r8(pb);
     avio_rb24(pb); /* flags */
     entries = avio_rb32(pb);