[FFmpeg-devel] [PATCH v3 1/5] avutil: add ambient viewing environment metadata side data
From: Limin Wang Signed-off-by: Limin Wang --- libavutil/frame.c | 1 + libavutil/frame.h | 6 + libavutil/mastering_display_metadata.c | 23 + libavutil/mastering_display_metadata.h | 45 ++ libavutil/version.h| 2 +- 5 files changed, 76 insertions(+), 1 deletion(-) diff --git a/libavutil/frame.c b/libavutil/frame.c index fbb869f..8882da2 100644 --- a/libavutil/frame.c +++ b/libavutil/frame.c @@ -815,6 +815,7 @@ const char *av_frame_side_data_name(enum AVFrameSideDataType type) case AV_FRAME_DATA_DETECTION_BBOXES:return "Bounding boxes for object detection and classification"; case AV_FRAME_DATA_DOVI_RPU_BUFFER: return "Dolby Vision RPU Data"; case AV_FRAME_DATA_DOVI_METADATA: return "Dolby Vision Metadata"; +case AV_FRAME_DATA_AMBIENT_VIEWING_ENV: return "Ambient Viewing Environment"; } return NULL; } diff --git a/libavutil/frame.h b/libavutil/frame.h index 33fac20..92413c9 100644 --- a/libavutil/frame.h +++ b/libavutil/frame.h @@ -209,6 +209,12 @@ enum AVFrameSideDataType { * volume transform - CUVA 005.1-2021. */ AV_FRAME_DATA_DYNAMIC_HDR_VIVID, + +/** + * ambient viewing environment for a video frame, as described by + * the AVAmbientViewingEnv + */ +AV_FRAME_DATA_AMBIENT_VIEWING_ENV, }; enum AVActiveFormatDescription { diff --git a/libavutil/mastering_display_metadata.c b/libavutil/mastering_display_metadata.c index 6069347..f094eab 100644 --- a/libavutil/mastering_display_metadata.c +++ b/libavutil/mastering_display_metadata.c @@ -64,3 +64,26 @@ AVContentLightMetadata *av_content_light_metadata_create_side_data(AVFrame *fram return (AVContentLightMetadata *)side_data->data; } + +AVAmbientViewingEnv *av_ambient_viewing_env_alloc(size_t *size) +{ +AVAmbientViewingEnv *metadata = av_mallocz(sizeof(*metadata)); + +if (size) +*size = sizeof(*metadata); + +return metadata; +} + +AVAmbientViewingEnv *av_ambient_viewing_env_create_side_data(AVFrame *frame) +{ +AVFrameSideData *side_data = av_frame_new_side_data(frame, +AV_FRAME_DATA_AMBIENT_VIEWING_ENV, +sizeof(AVAmbientViewingEnv)); +if (!side_data) +return NULL; + +memset(side_data->data, 0, sizeof(AVAmbientViewingEnv)); + +return (AVAmbientViewingEnv *)side_data->data; +} diff --git a/libavutil/mastering_display_metadata.h b/libavutil/mastering_display_metadata.h index c23b07c..c1ba659 100644 --- a/libavutil/mastering_display_metadata.h +++ b/libavutil/mastering_display_metadata.h @@ -125,4 +125,49 @@ AVContentLightMetadata *av_content_light_metadata_alloc(size_t *size); */ AVContentLightMetadata *av_content_light_metadata_create_side_data(AVFrame *frame); +/** + * The characteristics of the nominal ambient viewing environment for + * the display of the associated video content. + * To be used as payload of a AVFrameSideData the appropriate type. + * + * @note The struct should be allocated with av_ambient_viewing_env_alloc() + * and its size is not a part of the public ABI. + */ +typedef struct AVAmbientViewingEnv { +/** + * specifies the environmental illuminance of the ambient viewing + * environment in units of 0.0001 lux. + * ambient_illuminance shall not be equal to 0. + */ +uint32_t ambient_illuminance; +/** + * specify the normalized x and y chromaticity coordinates, respectively, + * of the environmental ambient light in the nominal viewing environment, + * according to the CIE 1931 definition of x and y as specified in ISO + * 11664-1 (see also ISO 11664-3 and CIE 15), in normalized increments of + * 0.2. The values of ambient_light_x and ambient_light_y shall be in + * the range of 0 to 5 + */ +uint16_t ambient_light_x; +uint16_t ambient_light_y; +} AVAmbientViewingEnv; + +/** + * Allocate an AVAmbientViewingEnv structure and set its fields to + * default values. The resulting struct can be freed using av_freep(). + * + * @return An AVAmbientViewingEnv filled with default values or NULL + * on failure. + */ +AVAmbientViewingEnv *av_ambient_viewing_env_alloc(size_t *size); + +/** + * Allocate a complete AVAmbientViewingEnv and add it to the frame. + * + * @param frame The frame which side data is added to. + * + * @return The AVAmbientViewingEnv structure to be filled by caller. + */ +AVAmbientViewingEnv *av_ambient_viewing_env_create_side_data(AVFrame *frame); + #endif /* AVUTIL_MASTERING_DISPLAY_METADATA_H */ diff --git a/libavutil/version.h b/libavutil/version.h index 6735c20..998202f 100644 --- a/libavutil/version.h +++ b/libavutil/version.h @@ -79,7 +79,7 @@ */ #define LIBAVUTIL_VERSION_MAJOR 57 -#define LIBAVUTIL_VERSION_MINOR 24 +#define LIBAVUTIL_VERSION_MINOR 25 #define LIBAVUTIL_VERSION_MICRO 101 #define LIBAVUTIL
Re: [FFmpeg-devel] [PATCH v3 1/5] avutil: add ambient viewing environment metadata side data
lance.lmw...@gmail.com: > From: Limin Wang > > Signed-off-by: Limin Wang > --- > libavutil/frame.c | 1 + > libavutil/frame.h | 6 + > libavutil/mastering_display_metadata.c | 23 + > libavutil/mastering_display_metadata.h | 45 > ++ > libavutil/version.h| 2 +- > 5 files changed, 76 insertions(+), 1 deletion(-) > > diff --git a/libavutil/frame.c b/libavutil/frame.c > index fbb869f..8882da2 100644 > --- a/libavutil/frame.c > +++ b/libavutil/frame.c > @@ -815,6 +815,7 @@ const char *av_frame_side_data_name(enum > AVFrameSideDataType type) > case AV_FRAME_DATA_DETECTION_BBOXES:return "Bounding boxes > for object detection and classification"; > case AV_FRAME_DATA_DOVI_RPU_BUFFER: return "Dolby Vision RPU > Data"; > case AV_FRAME_DATA_DOVI_METADATA: return "Dolby Vision > Metadata"; > +case AV_FRAME_DATA_AMBIENT_VIEWING_ENV: return "Ambient Viewing > Environment"; > } > return NULL; > } > diff --git a/libavutil/frame.h b/libavutil/frame.h > index 33fac20..92413c9 100644 > --- a/libavutil/frame.h > +++ b/libavutil/frame.h > @@ -209,6 +209,12 @@ enum AVFrameSideDataType { > * volume transform - CUVA 005.1-2021. > */ > AV_FRAME_DATA_DYNAMIC_HDR_VIVID, > + > +/** > + * ambient viewing environment for a video frame, as described by > + * the AVAmbientViewingEnv > + */ > +AV_FRAME_DATA_AMBIENT_VIEWING_ENV, > }; > > enum AVActiveFormatDescription { > diff --git a/libavutil/mastering_display_metadata.c > b/libavutil/mastering_display_metadata.c > index 6069347..f094eab 100644 > --- a/libavutil/mastering_display_metadata.c > +++ b/libavutil/mastering_display_metadata.c > @@ -64,3 +64,26 @@ AVContentLightMetadata > *av_content_light_metadata_create_side_data(AVFrame *fram > > return (AVContentLightMetadata *)side_data->data; > } > + > +AVAmbientViewingEnv *av_ambient_viewing_env_alloc(size_t *size) > +{ > +AVAmbientViewingEnv *metadata = av_mallocz(sizeof(*metadata)); > + > +if (size) > +*size = sizeof(*metadata); > + > +return metadata; > +} > + > +AVAmbientViewingEnv *av_ambient_viewing_env_create_side_data(AVFrame *frame) > +{ > +AVFrameSideData *side_data = av_frame_new_side_data(frame, > +AV_FRAME_DATA_AMBIENT_VIEWING_ENV, > +sizeof(AVAmbientViewingEnv)); > +if (!side_data) > +return NULL; > + > +memset(side_data->data, 0, sizeof(AVAmbientViewingEnv)); > + > +return (AVAmbientViewingEnv *)side_data->data; > +} > diff --git a/libavutil/mastering_display_metadata.h > b/libavutil/mastering_display_metadata.h > index c23b07c..c1ba659 100644 > --- a/libavutil/mastering_display_metadata.h > +++ b/libavutil/mastering_display_metadata.h > @@ -125,4 +125,49 @@ AVContentLightMetadata > *av_content_light_metadata_alloc(size_t *size); > */ > AVContentLightMetadata *av_content_light_metadata_create_side_data(AVFrame > *frame); > > +/** > + * The characteristics of the nominal ambient viewing environment for > + * the display of the associated video content. > + * To be used as payload of a AVFrameSideData the appropriate type. > + * > + * @note The struct should be allocated with av_ambient_viewing_env_alloc() > + * and its size is not a part of the public ABI. > + */ > +typedef struct AVAmbientViewingEnv { > +/** > + * specifies the environmental illuminance of the ambient viewing > + * environment in units of 0.0001 lux. > + * ambient_illuminance shall not be equal to 0. > + */ > +uint32_t ambient_illuminance; > +/** > + * specify the normalized x and y chromaticity coordinates, respectively, > + * of the environmental ambient light in the nominal viewing environment, > + * according to the CIE 1931 definition of x and y as specified in ISO > + * 11664-1 (see also ISO 11664-3 and CIE 15), in normalized increments of > + * 0.2. The values of ambient_light_x and ambient_light_y shall be in > + * the range of 0 to 5 > + */ > +uint16_t ambient_light_x; > +uint16_t ambient_light_y; > +} AVAmbientViewingEnv; > + > +/** > + * Allocate an AVAmbientViewingEnv structure and set its fields to > + * default values. The resulting struct can be freed using av_freep(). > + * > + * @return An AVAmbientViewingEnv filled with default values or NULL > + * on failure. > + */ > +AVAmbientViewingEnv *av_ambient_viewing_env_alloc(size_t *size); > + > +/** > + * Allocate a complete AVAmbientViewingEnv and add it to the frame. > + * > + * @param frame The frame which side data is added to. > + * > + * @return The AVAmbientViewingEnv structure to be filled by caller. > + */ > +AVAmbientViewingEnv *av_ambient_viewing_env_create_side_data(AVFrame *frame); All this boilerplate code for the various side-data--types makes me wonder whether they
Re: [FFmpeg-devel] [PATCH v3 1/5] avutil: add ambient viewing environment metadata side data
5 Apr 2022, 17:32 by andreas.rheinha...@outlook.com: > lance.lmw...@gmail.com: > >> From: Limin Wang >> >> Signed-off-by: Limin Wang >> --- >> libavutil/frame.c | 1 + >> libavutil/frame.h | 6 + >> libavutil/mastering_display_metadata.c | 23 + >> libavutil/mastering_display_metadata.h | 45 >> ++ >> libavutil/version.h| 2 +- >> 5 files changed, 76 insertions(+), 1 deletion(-) >> >> diff --git a/libavutil/frame.c b/libavutil/frame.c >> index fbb869f..8882da2 100644 >> --- a/libavutil/frame.c >> +++ b/libavutil/frame.c >> @@ -815,6 +815,7 @@ const char *av_frame_side_data_name(enum >> AVFrameSideDataType type) >> case AV_FRAME_DATA_DETECTION_BBOXES:return "Bounding boxes for >> object detection and classification"; >> case AV_FRAME_DATA_DOVI_RPU_BUFFER: return "Dolby Vision RPU >> Data"; >> case AV_FRAME_DATA_DOVI_METADATA: return "Dolby Vision >> Metadata"; >> +case AV_FRAME_DATA_AMBIENT_VIEWING_ENV: return "Ambient Viewing >> Environment"; >> } >> return NULL; >> } >> diff --git a/libavutil/frame.h b/libavutil/frame.h >> index 33fac20..92413c9 100644 >> --- a/libavutil/frame.h >> +++ b/libavutil/frame.h >> @@ -209,6 +209,12 @@ enum AVFrameSideDataType { >> * volume transform - CUVA 005.1-2021. >> */ >> AV_FRAME_DATA_DYNAMIC_HDR_VIVID, >> + >> +/** >> + * ambient viewing environment for a video frame, as described by >> + * the AVAmbientViewingEnv >> + */ >> +AV_FRAME_DATA_AMBIENT_VIEWING_ENV, >> }; >> >> enum AVActiveFormatDescription { >> diff --git a/libavutil/mastering_display_metadata.c >> b/libavutil/mastering_display_metadata.c >> index 6069347..f094eab 100644 >> --- a/libavutil/mastering_display_metadata.c >> +++ b/libavutil/mastering_display_metadata.c >> @@ -64,3 +64,26 @@ AVContentLightMetadata >> *av_content_light_metadata_create_side_data(AVFrame *fram >> >> return (AVContentLightMetadata *)side_data->data; >> } >> + >> +AVAmbientViewingEnv *av_ambient_viewing_env_alloc(size_t *size) >> +{ >> +AVAmbientViewingEnv *metadata = av_mallocz(sizeof(*metadata)); >> + >> +if (size) >> +*size = sizeof(*metadata); >> + >> +return metadata; >> +} >> + >> +AVAmbientViewingEnv *av_ambient_viewing_env_create_side_data(AVFrame *frame) >> +{ >> +AVFrameSideData *side_data = av_frame_new_side_data(frame, >> +AV_FRAME_DATA_AMBIENT_VIEWING_ENV, >> +sizeof(AVAmbientViewingEnv)); >> +if (!side_data) >> +return NULL; >> + >> +memset(side_data->data, 0, sizeof(AVAmbientViewingEnv)); >> + >> +return (AVAmbientViewingEnv *)side_data->data; >> +} >> diff --git a/libavutil/mastering_display_metadata.h >> b/libavutil/mastering_display_metadata.h >> index c23b07c..c1ba659 100644 >> --- a/libavutil/mastering_display_metadata.h >> +++ b/libavutil/mastering_display_metadata.h >> @@ -125,4 +125,49 @@ AVContentLightMetadata >> *av_content_light_metadata_alloc(size_t *size); >> */ >> AVContentLightMetadata *av_content_light_metadata_create_side_data(AVFrame >> *frame); >> >> +/** >> + * The characteristics of the nominal ambient viewing environment for >> + * the display of the associated video content. >> + * To be used as payload of a AVFrameSideData the appropriate type. >> + * >> + * @note The struct should be allocated with av_ambient_viewing_env_alloc() >> + * and its size is not a part of the public ABI. >> + */ >> +typedef struct AVAmbientViewingEnv { >> +/** >> + * specifies the environmental illuminance of the ambient viewing >> + * environment in units of 0.0001 lux. >> + * ambient_illuminance shall not be equal to 0. >> + */ >> +uint32_t ambient_illuminance; >> +/** >> + * specify the normalized x and y chromaticity coordinates, >> respectively, >> + * of the environmental ambient light in the nominal viewing >> environment, >> + * according to the CIE 1931 definition of x and y as specified in ISO >> + * 11664-1 (see also ISO 11664-3 and CIE 15), in normalized increments >> of >> + * 0.2. The values of ambient_light_x and ambient_light_y shall be >> in >> + * the range of 0 to 5 >> + */ >> +uint16_t ambient_light_x; >> +uint16_t ambient_light_y; >> +} AVAmbientViewingEnv; >> + >> +/** >> + * Allocate an AVAmbientViewingEnv structure and set its fields to >> + * default values. The resulting struct can be freed using av_freep(). >> + * >> + * @return An AVAmbientViewingEnv filled with default values or NULL >> + * on failure. >> + */ >> +AVAmbientViewingEnv *av_ambient_viewing_env_alloc(size_t *size); >> + >> +/** >> + * Allocate a complete AVAmbientViewingEnv and add it to the frame. >> + * >> + * @param frame The frame which side data is added to. >> + * >> + * @return The AVAmbientViewingEnv structure to be filled by caller. >> + */ >> +
Re: [FFmpeg-devel] [PATCH v3 1/5] avutil: add ambient viewing environment metadata side data
Quoting Lynne (2022-04-05 21:00:24) > 5 Apr 2022, 17:32 by andreas.rheinha...@outlook.com: > Why is this side data type allocated, rather than what used to be > the standard, making the side data struct size const? Copy-paste? > > Are new fields expected to be added in the future? HDR mastering > metadata is also allocated, but we've never added any fields since > it was merged. Better to have the option and not use it than the converse. -- Anton Khirnov ___ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-devel] [PATCH v3 1/5] avutil: add ambient viewing environment metadata side data
Lynne: > 5 Apr 2022, 17:32 by andreas.rheinha...@outlook.com: > >> lance.lmw...@gmail.com: >> >>> From: Limin Wang >>> >>> Signed-off-by: Limin Wang >>> --- >>> libavutil/frame.c | 1 + >>> libavutil/frame.h | 6 + >>> libavutil/mastering_display_metadata.c | 23 + >>> libavutil/mastering_display_metadata.h | 45 >>> ++ >>> libavutil/version.h| 2 +- >>> 5 files changed, 76 insertions(+), 1 deletion(-) >>> >>> diff --git a/libavutil/frame.c b/libavutil/frame.c >>> index fbb869f..8882da2 100644 >>> --- a/libavutil/frame.c >>> +++ b/libavutil/frame.c >>> @@ -815,6 +815,7 @@ const char *av_frame_side_data_name(enum >>> AVFrameSideDataType type) >>> case AV_FRAME_DATA_DETECTION_BBOXES:return "Bounding boxes for >>> object detection and classification"; >>> case AV_FRAME_DATA_DOVI_RPU_BUFFER: return "Dolby Vision RPU >>> Data"; >>> case AV_FRAME_DATA_DOVI_METADATA: return "Dolby Vision >>> Metadata"; >>> +case AV_FRAME_DATA_AMBIENT_VIEWING_ENV: return "Ambient >>> Viewing Environment"; >>> } >>> return NULL; >>> } >>> diff --git a/libavutil/frame.h b/libavutil/frame.h >>> index 33fac20..92413c9 100644 >>> --- a/libavutil/frame.h >>> +++ b/libavutil/frame.h >>> @@ -209,6 +209,12 @@ enum AVFrameSideDataType { >>> * volume transform - CUVA 005.1-2021. >>> */ >>> AV_FRAME_DATA_DYNAMIC_HDR_VIVID, >>> + >>> +/** >>> + * ambient viewing environment for a video frame, as described by >>> + * the AVAmbientViewingEnv >>> + */ >>> +AV_FRAME_DATA_AMBIENT_VIEWING_ENV, >>> }; >>> >>> enum AVActiveFormatDescription { >>> diff --git a/libavutil/mastering_display_metadata.c >>> b/libavutil/mastering_display_metadata.c >>> index 6069347..f094eab 100644 >>> --- a/libavutil/mastering_display_metadata.c >>> +++ b/libavutil/mastering_display_metadata.c >>> @@ -64,3 +64,26 @@ AVContentLightMetadata >>> *av_content_light_metadata_create_side_data(AVFrame *fram >>> >>> return (AVContentLightMetadata *)side_data->data; >>> } >>> + >>> +AVAmbientViewingEnv *av_ambient_viewing_env_alloc(size_t *size) >>> +{ >>> +AVAmbientViewingEnv *metadata = av_mallocz(sizeof(*metadata)); >>> + >>> +if (size) >>> +*size = sizeof(*metadata); >>> + >>> +return metadata; >>> +} >>> + >>> +AVAmbientViewingEnv *av_ambient_viewing_env_create_side_data(AVFrame >>> *frame) >>> +{ >>> +AVFrameSideData *side_data = av_frame_new_side_data(frame, >>> +AV_FRAME_DATA_AMBIENT_VIEWING_ENV, >>> +sizeof(AVAmbientViewingEnv)); >>> +if (!side_data) >>> +return NULL; >>> + >>> +memset(side_data->data, 0, sizeof(AVAmbientViewingEnv)); >>> + >>> +return (AVAmbientViewingEnv *)side_data->data; >>> +} >>> diff --git a/libavutil/mastering_display_metadata.h >>> b/libavutil/mastering_display_metadata.h >>> index c23b07c..c1ba659 100644 >>> --- a/libavutil/mastering_display_metadata.h >>> +++ b/libavutil/mastering_display_metadata.h >>> @@ -125,4 +125,49 @@ AVContentLightMetadata >>> *av_content_light_metadata_alloc(size_t *size); >>> */ >>> AVContentLightMetadata *av_content_light_metadata_create_side_data(AVFrame >>> *frame); >>> >>> +/** >>> + * The characteristics of the nominal ambient viewing environment for >>> + * the display of the associated video content. >>> + * To be used as payload of a AVFrameSideData the appropriate type. >>> + * >>> + * @note The struct should be allocated with av_ambient_viewing_env_alloc() >>> + * and its size is not a part of the public ABI. >>> + */ >>> +typedef struct AVAmbientViewingEnv { >>> +/** >>> + * specifies the environmental illuminance of the ambient viewing >>> + * environment in units of 0.0001 lux. >>> + * ambient_illuminance shall not be equal to 0. >>> + */ >>> +uint32_t ambient_illuminance; >>> +/** >>> + * specify the normalized x and y chromaticity coordinates, >>> respectively, >>> + * of the environmental ambient light in the nominal viewing >>> environment, >>> + * according to the CIE 1931 definition of x and y as specified in ISO >>> + * 11664-1 (see also ISO 11664-3 and CIE 15), in normalized increments >>> of >>> + * 0.2. The values of ambient_light_x and ambient_light_y shall be >>> in >>> + * the range of 0 to 5 >>> + */ >>> +uint16_t ambient_light_x; >>> +uint16_t ambient_light_y; >>> +} AVAmbientViewingEnv; >>> + >>> +/** >>> + * Allocate an AVAmbientViewingEnv structure and set its fields to >>> + * default values. The resulting struct can be freed using av_freep(). >>> + * >>> + * @return An AVAmbientViewingEnv filled with default values or NULL >>> + * on failure. >>> + */ >>> +AVAmbientViewingEnv *av_ambient_viewing_env_alloc(size_t *size); >>> + >>> +/** >>> + * Allocate a complete AVAmbientViewingEnv and add it to the frame. >>> + *
Re: [FFmpeg-devel] [PATCH v3 1/5] avutil: add ambient viewing environment metadata side data
On Tue, Apr 05, 2022 at 05:32:12PM +0200, Andreas Rheinhardt wrote: > lance.lmw...@gmail.com: > > From: Limin Wang > > > > Signed-off-by: Limin Wang > > --- > > libavutil/frame.c | 1 + > > libavutil/frame.h | 6 + > > libavutil/mastering_display_metadata.c | 23 + > > libavutil/mastering_display_metadata.h | 45 > > ++ > > libavutil/version.h| 2 +- > > 5 files changed, 76 insertions(+), 1 deletion(-) > > > > diff --git a/libavutil/frame.c b/libavutil/frame.c > > index fbb869f..8882da2 100644 > > --- a/libavutil/frame.c > > +++ b/libavutil/frame.c > > @@ -815,6 +815,7 @@ const char *av_frame_side_data_name(enum > > AVFrameSideDataType type) > > case AV_FRAME_DATA_DETECTION_BBOXES:return "Bounding boxes > > for object detection and classification"; > > case AV_FRAME_DATA_DOVI_RPU_BUFFER: return "Dolby Vision > > RPU Data"; > > case AV_FRAME_DATA_DOVI_METADATA: return "Dolby Vision > > Metadata"; > > +case AV_FRAME_DATA_AMBIENT_VIEWING_ENV: return "Ambient > > Viewing Environment"; > > } > > return NULL; > > } > > diff --git a/libavutil/frame.h b/libavutil/frame.h > > index 33fac20..92413c9 100644 > > --- a/libavutil/frame.h > > +++ b/libavutil/frame.h > > @@ -209,6 +209,12 @@ enum AVFrameSideDataType { > > * volume transform - CUVA 005.1-2021. > > */ > > AV_FRAME_DATA_DYNAMIC_HDR_VIVID, > > + > > +/** > > + * ambient viewing environment for a video frame, as described by > > + * the AVAmbientViewingEnv > > + */ > > +AV_FRAME_DATA_AMBIENT_VIEWING_ENV, > > }; > > > > enum AVActiveFormatDescription { > > diff --git a/libavutil/mastering_display_metadata.c > > b/libavutil/mastering_display_metadata.c > > index 6069347..f094eab 100644 > > --- a/libavutil/mastering_display_metadata.c > > +++ b/libavutil/mastering_display_metadata.c > > @@ -64,3 +64,26 @@ AVContentLightMetadata > > *av_content_light_metadata_create_side_data(AVFrame *fram > > > > return (AVContentLightMetadata *)side_data->data; > > } > > + > > +AVAmbientViewingEnv *av_ambient_viewing_env_alloc(size_t *size) > > +{ > > +AVAmbientViewingEnv *metadata = av_mallocz(sizeof(*metadata)); > > + > > +if (size) > > +*size = sizeof(*metadata); > > + > > +return metadata; > > +} > > + > > +AVAmbientViewingEnv *av_ambient_viewing_env_create_side_data(AVFrame > > *frame) > > +{ > > +AVFrameSideData *side_data = av_frame_new_side_data(frame, > > +AV_FRAME_DATA_AMBIENT_VIEWING_ENV, > > +sizeof(AVAmbientViewingEnv)); > > +if (!side_data) > > +return NULL; > > + > > +memset(side_data->data, 0, sizeof(AVAmbientViewingEnv)); > > + > > +return (AVAmbientViewingEnv *)side_data->data; > > +} > > diff --git a/libavutil/mastering_display_metadata.h > > b/libavutil/mastering_display_metadata.h > > index c23b07c..c1ba659 100644 > > --- a/libavutil/mastering_display_metadata.h > > +++ b/libavutil/mastering_display_metadata.h > > @@ -125,4 +125,49 @@ AVContentLightMetadata > > *av_content_light_metadata_alloc(size_t *size); > > */ > > AVContentLightMetadata *av_content_light_metadata_create_side_data(AVFrame > > *frame); > > > > +/** > > + * The characteristics of the nominal ambient viewing environment for > > + * the display of the associated video content. > > + * To be used as payload of a AVFrameSideData the appropriate type. > > + * > > + * @note The struct should be allocated with av_ambient_viewing_env_alloc() > > + * and its size is not a part of the public ABI. > > + */ > > +typedef struct AVAmbientViewingEnv { > > +/** > > + * specifies the environmental illuminance of the ambient viewing > > + * environment in units of 0.0001 lux. > > + * ambient_illuminance shall not be equal to 0. > > + */ > > +uint32_t ambient_illuminance; > > +/** > > + * specify the normalized x and y chromaticity coordinates, > > respectively, > > + * of the environmental ambient light in the nominal viewing > > environment, > > + * according to the CIE 1931 definition of x and y as specified in ISO > > + * 11664-1 (see also ISO 11664-3 and CIE 15), in normalized increments > > of > > + * 0.2. The values of ambient_light_x and ambient_light_y shall be > > in > > + * the range of 0 to 5 > > + */ > > +uint16_t ambient_light_x; > > +uint16_t ambient_light_y; > > +} AVAmbientViewingEnv; > > + > > +/** > > + * Allocate an AVAmbientViewingEnv structure and set its fields to > > + * default values. The resulting struct can be freed using av_freep(). > > + * > > + * @return An AVAmbientViewingEnv filled with default values or NULL > > + * on failure. > > + */ > > +AVAmbientViewingEnv *av_ambient_viewing_env_alloc(size_t *size); > > + > > +/** > > + * Allocate a complete AVAmbientView