[FFmpeg-devel] [PATCH] lavf/isom: support for demuxing MPEG-H 3D Audio in MP4

[Yuki.Tsuchiya]

Implemented according to the specification at https://www.iso.org/standard/69561.html
The 'mhm1' sample entry is registered with MP4RA, which is defined as MHAS encapsulated single stream MPEG-H 3D Audio.
'MHAS' stands for MPEG-H audio stream, which contains encoded audio data and corresponds metadata for decoding.
This patch enables extracting the MHAS bitstream from MP4.

Signed-off-by: Yuki.Tsuchiya <Yuki.Tsuchiya at sony.com>
---
 Changelog               | 1 +
 libavcodec/avcodec.h    | 1 +
 libavcodec/codec_desc.c | 7 +++++++
 libavcodec/version.h    | 2 +-
 libavformat/isom.c      | 1 +
 5 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/Changelog b/Changelog
index 44e4184..2a79a1a 100644
--- a/Changelog
+++ b/Changelog
@@ -16,6 +16,7 @@ version <next>:
 - photosensitivity filter
 - anlms filter
 - arnndn filter
+- Support for demuxing MPEG-H 3D Audio in mp4
 
 
 version 4.2:
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index bcb931f..8c1a85d 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -654,6 +654,7 @@ enum AVCodecID {
     AV_CODEC_ID_ATRAC9,
     AV_CODEC_ID_HCOM,
     AV_CODEC_ID_ACELP_KELVIN,
+    AV_CODEC_ID_MPEGH_3D_AUDIO,
 
     /* subtitle codecs */
     AV_CODEC_ID_FIRST_SUBTITLE = 0x17000,          ///< A dummy ID pointing at the start of subtitle codecs.
diff --git a/libavcodec/codec_desc.c b/libavcodec/codec_desc.c
index 0602ecb..a970fae 100644
--- a/libavcodec/codec_desc.c
+++ b/libavcodec/codec_desc.c
@@ -2998,6 +2998,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
         .long_name = NULL_IF_CONFIG_SMALL("Sipro ACELP.KELVIN"),
         .props     = AV_CODEC_PROP_LOSSY,
     },
+    {
+        .id        = AV_CODEC_ID_MPEGH_3D_AUDIO,
+        .type      = AVMEDIA_TYPE_AUDIO,
+        .name      = "mpegh_3d_audio",
+        .long_name = NULL_IF_CONFIG_SMALL("MPEG-H 3D Audio"),
+        .props     = AV_CODEC_PROP_LOSSY,
+    },
 
     /* subtitle codecs */
     {
diff --git a/libavcodec/version.h b/libavcodec/version.h
index 2e047a6..0992d1e 100644
--- a/libavcodec/version.h
+++ b/libavcodec/version.h
@@ -29,7 +29,7 @@
 
 #define LIBAVCODEC_VERSION_MAJOR  58
 #define LIBAVCODEC_VERSION_MINOR  59
-#define LIBAVCODEC_VERSION_MICRO 102
+#define LIBAVCODEC_VERSION_MICRO 103
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
                                                LIBAVCODEC_VERSION_MINOR, \
diff --git a/libavformat/isom.c b/libavformat/isom.c
index edd0d81..c1a64c7 100644
--- a/libavformat/isom.c
+++ b/libavformat/isom.c
@@ -371,6 +371,7 @@ const AVCodecTag ff_codec_movaudio_tags[] = {
     { AV_CODEC_ID_FLAC,            MKTAG('f', 'L', 'a', 'C') }, /* nonstandard */
     { AV_CODEC_ID_TRUEHD,          MKTAG('m', 'l', 'p', 'a') }, /* mp4ra.org */
     { AV_CODEC_ID_OPUS,            MKTAG('O', 'p', 'u', 's') }, /* mp4ra.org */
+    { AV_CODEC_ID_MPEGH_3D_AUDIO,  MKTAG('m', 'h', 'm', '1') }, /* MPEG-H 3D Audio */
     { AV_CODEC_ID_NONE, 0 },
 };
 
-- 
2.7.4