[FFmpeg-devel] [PATCH 1/3 v2] avutil: Add GOP timecode frame side data

[Michael Niedermayer]

On Sun, Jan 31, 2016 at 02:36:18PM +0000, Derek Buitenhuis wrote:
> Signed-off-by: Derek Buitenhuis <derek.buitenhuis at gmail.com>
> ---
>  doc/APIchanges      | 3 +++
>  libavutil/frame.c   | 1 +
>  libavutil/frame.h   | 7 ++++++-
>  libavutil/version.h | 4 ++--
>  4 files changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/doc/APIchanges b/doc/APIchanges
> index 15aefb5..45ccf13 100644
> --- a/doc/APIchanges
> +++ b/doc/APIchanges
> @@ -15,6 +15,9 @@ libavutil:     2015-08-28
>  
>  API changes, most recent first:
>  
> +2016-01-31 - xxxxxxx - lavu 55.17.100
> +  Add AV_FRAME_DATA_GOP_TIMECODE for exporting MPEG1/2 GOP timecodes.
> +
>  2016-01-01 - xxxxxxx - lavc 57.21.100 / 57.12.0 - avcodec.h
>    Add AVCodecDescriptor.profiles and avcodec_profile_name().
>  
> diff --git a/libavutil/frame.c b/libavutil/frame.c
> index 9f9c720..c33e462 100644
> --- a/libavutil/frame.c
> +++ b/libavutil/frame.c
> @@ -733,6 +733,7 @@ const char *av_frame_side_data_name(enum AVFrameSideDataType type)
>      case AV_FRAME_DATA_SKIP_SAMPLES:    return "Skip samples";
>      case AV_FRAME_DATA_AUDIO_SERVICE_TYPE:          return "Audio service type";
>      case AV_FRAME_DATA_MASTERING_DISPLAY_METADATA:  return "Mastering display metadata";
> +    case AV_FRAME_DATA_GOP_TIMECODE:                return "GOP timecode";
>      }
>      return NULL;
>  }
> diff --git a/libavutil/frame.h b/libavutil/frame.h
> index 406c8b5..e07922d 100644
> --- a/libavutil/frame.h
> +++ b/libavutil/frame.h
> @@ -116,7 +116,12 @@ enum AVFrameSideDataType {
>       * an AVMasteringDisplayMetadata type and contains information about the
>       * mastering display color volume.
>       */
> -    AV_FRAME_DATA_MASTERING_DISPLAY_METADATA
> +    AV_FRAME_DATA_MASTERING_DISPLAY_METADATA,
> +    /**
> +     * The GOP timecode in 25 bit timecode format. Data format is 64-bit integer.
> +     * This is set on the first frame of a GOP.

whats the first frame of a gop ?
for example there may be B frames prior to an I frame in display
order

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Into a blind darkness they enter who follow after the Ignorance,
they as if into a greater darkness enter who devote themselves
to the Knowledge alone. -- Isha Upanishad
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