Re: [FFmpeg-devel] [PATCH 3/4] avcodec/decode: Set KEY flag+pict_type generically for intra-only codecs

["Tomas Härdin" <git@haerdin.se>]

tor 2024-05-09 klockan 04:04 +0200 skrev Andreas Rheinhardt:
> This commit is the analog of 3f11eac75741888c7b2b6f93c458766f2613bab5
> for decoding: It sets the AV_FRAME_FLAG_KEY and (for video decoders)
> also pict_type to AV_PICTURE_TYPE_I. It furthermore stops setting
> audio frames as always being key frames -- it is wrong for e.g.
> TrueHD/MLP. The latter also affects TAK and DFPWM.
> 
> The change already improves output for several decoders where
> it has been forgotten to set e.g. pict_type like speedhq, wnv1
> or tiff. The latter is the reason for the change to the exif-image-
> tiff
> FATE test reference file.
> 
> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
> ---
>  libavcodec/decode.c            | 29 +++++++++++++++++++++++++++--
>  libavcodec/pthread_frame.c     | 17 ++++++++++++++---
>  tests/ref/fate/exif-image-tiff |  2 +-
>  3 files changed, 42 insertions(+), 6 deletions(-)
> 
> diff --git a/libavcodec/decode.c b/libavcodec/decode.c
> index d031b1ca17..0ca5344ef5 100644
> --- a/libavcodec/decode.c
> +++ b/libavcodec/decode.c
> @@ -57,6 +57,20 @@
>  typedef struct DecodeContext {
>      AVCodecInternal avci;
>  
> +    /**
> +     * This is set to AV_FRAME_FLAG_KEY for decoders of intra-only
> formats
> +     * (those whose codec descriptor has AV_CODEC_PROP_INTRA_ONLY
> set)
> +     * to set the flag generically.
> +     */
> +    int intra_only_flag;
> +
> +    /**
> +     * This is set to AV_PICTURE_TYPE_I for intra only video
> decoders
> +     * and to AV_PICTURE_TYPE_NONE for other decoders. It is used to
> set
> +     * the AVFrame's pict_type before the decoder receives it.
> +     */
> +    enum AVPictureType initial_pict_type;

Carrying this around as state seems unnecessary when a small static
function could do the same?

> @@ -108,6 +106,10 @@ typedef struct PerThreadContext {
>      int hwaccel_threadsafe;
>  
>      atomic_int debug_threads;       ///< Set if the FF_DEBUG_THREADS
> option is set.
> +
> +    /// The following two fields have the same semantics as the
> DecodeContext field
> +    int intra_only_flag;
> +    enum AVPictureType initial_pict_type;

Same here

/Tomas
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