[FFmpeg-devel] [PATCH v6] avutil: add AV_FRAME_DATA_USER_DATA_UNREGISTERED side data type

[Mark Thompson]

On 06/01/2020 14:54, lance.lmwang at gmail.com wrote:
> From: Limin Wang <lance.lmwang at gmail.com>
> 
> Signed-off-by: Limin Wang <lance.lmwang at gmail.com>
> ---
> Fix for the v5 commit message change when copy(add avutil:)
> 
>  doc/APIchanges      | 3 +++
>  libavutil/frame.c   | 1 +
>  libavutil/frame.h   | 8 ++++++++
>  libavutil/version.h | 2 +-
>  4 files changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/doc/APIchanges b/doc/APIchanges
> index 3c24dc6..6e1673e 100644
> --- a/doc/APIchanges
> +++ b/doc/APIchanges
> @@ -15,6 +15,9 @@ libavutil:     2017-10-21
>  
>  API changes, most recent first:
>  
> +2020-01-xx - xxxxxxxxxx - lavu 56.39.100 - frame.h
> +  Add AV_FRAME_DATA_USER_DATA_UNREGISTERED.
> +
>  2019-12-27 - xxxxxxxxxx - lavu 56.38.100 - eval.h
>    Add av_expr_count_func().
>  
> diff --git a/libavutil/frame.c b/libavutil/frame.c
> index e403809..1d0faec6 100644
> --- a/libavutil/frame.c
> +++ b/libavutil/frame.c
> @@ -842,6 +842,7 @@ const char *av_frame_side_data_name(enum AVFrameSideDataType type)
>  #endif
>      case AV_FRAME_DATA_DYNAMIC_HDR_PLUS: return "HDR Dynamic Metadata SMPTE2094-40 (HDR10+)";
>      case AV_FRAME_DATA_REGIONS_OF_INTEREST: return "Regions Of Interest";
> +    case AV_FRAME_DATA_USER_DATA_UNREGISTERED: return "User Data Unregistered";
>      }
>      return NULL;
>  }
> diff --git a/libavutil/frame.h b/libavutil/frame.h
> index b5afb58..9e8c3a9 100644
> --- a/libavutil/frame.h
> +++ b/libavutil/frame.h
> @@ -179,6 +179,14 @@ enum AVFrameSideDataType {
>       * array element is implied by AVFrameSideData.size / AVRegionOfInterest.self_size.
>       */
>      AV_FRAME_DATA_REGIONS_OF_INTEREST,
> +
> +    /**
> +     * User data unregistered metadata associated with a video frame.

IMO it should be stated directly that this is the H.26[45] UDU SEI message, and shouldn't be used for any other purpose.  Mention it here and reference the relevant sections of the standards.

> +     * This data payload is stored as uint8_t in AVFrameSideData.data.
> +     * The number of bytes of data payload is AVFrameSideData.size.
> +     * The data payload consists of 16 bytes UUID and real user data.

The ambiguity around the word payload is kindof confusing here.  I think either avoid using the word payload at all, or name the syntax elements explicitly (16 bytes of uuid_iso_iec_11578 followed by size-16 bytes of user_data_payload_byte).

> +     */
> +    AV_FRAME_DATA_USER_DATA_UNREGISTERED,
>  };
>  
>  enum AVActiveFormatDescription {
> diff --git a/libavutil/version.h b/libavutil/version.h
> index af8f614..2bc1b98 100644
> --- a/libavutil/version.h
> +++ b/libavutil/version.h
> @@ -79,7 +79,7 @@
>   */
>  
>  #define LIBAVUTIL_VERSION_MAJOR  56
> -#define LIBAVUTIL_VERSION_MINOR  38
> +#define LIBAVUTIL_VERSION_MINOR  39
>  #define LIBAVUTIL_VERSION_MICRO 100
>  
>  #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
> 

Thanks,

- Mark