[FFmpeg-devel] [PATCH v2] avfilter/f_select: yuv will use Y plane only for scenecut detect

[Marton Balint]

On Mon, 12 Aug 2019, lance.lmwang at gmail.com wrote:

> From: Limin Wang <lance.lmwang at gmail.com>
>
> Signed-off-by: Limin Wang <lance.lmwang at gmail.com>
> ---
> libavfilter/f_select.c                     |  3 ++-
> tests/ref/fate/filter-metadata-scenedetect | 16 ++++++++--------
> 2 files changed, 10 insertions(+), 9 deletions(-)
>
> diff --git a/libavfilter/f_select.c b/libavfilter/f_select.c
> index 5c7372c976..25a36ff0fa 100644
> --- a/libavfilter/f_select.c
> +++ b/libavfilter/f_select.c
> @@ -211,7 +211,8 @@ static int config_input(AVFilterLink *inlink)
>     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
>
>     select->bitdepth = desc->comp[0].depth;
> -    select->nb_planes = av_pix_fmt_count_planes(inlink->format);
> +    select->nb_planes = desc->flags & AV_PIX_FMT_FLAG_PLANAR ? 1 : av_pix_fmt_count_planes(inlink->format);
> +

This is very misleading even if it happens to work for the currently 
supported formats.

An is_yuv variable is good to have, because it says what we want, which is 
limit the number of planes only for YUV. So please use the previosuly 
suggested

     int is_yuv = !(desc->flags & AV_PIX_FMT_FLAG_RGB) &&
                  (desc->flags & AV_PIX_FMT_FLAG_PLANAR) &&
                  desc->nb_components >= 3;

(copied from tiff.c by the way) definition.

Thanks,
Marton


>     for (int plane = 0; plane < select->nb_planes; plane++) {
>         ptrdiff_t line_size = av_image_get_linesize(inlink->format, inlink->w, plane);
>         int vsub = desc->log2_chroma_h;
> diff --git a/tests/ref/fate/filter-metadata-scenedetect b/tests/ref/fate/filter-metadata-scenedetect
> index 7ce2d6794e..36c033bc0e 100644
> --- a/tests/ref/fate/filter-metadata-scenedetect
> +++ b/tests/ref/fate/filter-metadata-scenedetect
> @@ -1,11 +1,11 @@
> pkt_pts=1620|tag:lavfi.scene_score=1.000000
> -pkt_pts=4140|tag:lavfi.scene_score=0.668643
> -pkt_pts=5800|tag:lavfi.scene_score=0.996721
> -pkt_pts=6720|tag:lavfi.scene_score=0.357390
> -pkt_pts=8160|tag:lavfi.scene_score=0.886268
> -pkt_pts=9760|tag:lavfi.scene_score=0.926219
> -pkt_pts=14080|tag:lavfi.scene_score=0.650033
> +pkt_pts=4140|tag:lavfi.scene_score=0.923403
> +pkt_pts=5800|tag:lavfi.scene_score=1.000000
> +pkt_pts=6720|tag:lavfi.scene_score=0.475643
> +pkt_pts=8160|tag:lavfi.scene_score=1.000000
> +pkt_pts=9760|tag:lavfi.scene_score=1.000000
> +pkt_pts=14080|tag:lavfi.scene_score=0.874623
> pkt_pts=15700|tag:lavfi.scene_score=1.000000
> -pkt_pts=18500|tag:lavfi.scene_score=0.316402
> -pkt_pts=20040|tag:lavfi.scene_score=0.269509
> +pkt_pts=18500|tag:lavfi.scene_score=0.422509
> +pkt_pts=20040|tag:lavfi.scene_score=0.352360
> pkt_pts=21760|tag:lavfi.scene_score=1.000000
> -- 
> 2.21.0
>
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