[FFmpeg-devel] [PATCH v2 2/3] avfilter/vf_framerate: if metadata lavfi.scd.mafd exists, we'll use it first

[Paul B Mahol]

On 9/29/19, lance.lmwang at gmail.com <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/vf_framerate.c | 15 +++++++++++----
>  1 file changed, 11 insertions(+), 4 deletions(-)
>
> diff --git a/libavfilter/vf_framerate.c b/libavfilter/vf_framerate.c
> index 06e463e4d7..d7ae1ae850 100644
> --- a/libavfilter/vf_framerate.c
> +++ b/libavfilter/vf_framerate.c
> @@ -71,13 +71,20 @@ static double get_scene_score(AVFilterContext *ctx,
> AVFrame *crnt, AVFrame *next
>
>      if (crnt->height == next->height &&
>          crnt->width  == next->width) {
> +        AVDictionaryEntry *e_mafd = NULL;
>          uint64_t sad;
> -        double mafd, diff;
> +        double mafd = HUGE_VAL, diff;
> +        char *tail = NULL;
>
>          ff_dlog(ctx, "get_scene_score() process\n");
> -        s->sad(crnt->data[0], crnt->linesize[0], next->data[0],
> next->linesize[0], crnt->width, crnt->height, &sad);
> -        emms_c();
> -        mafd = (double)sad * 100.0 / (crnt->width * crnt->height) / (1 <<
> s->bitdepth);

Please use av_rescale_q()

> +        e_mafd = av_dict_get(next->metadata, "lavfi.scd.mafd", NULL,
> AV_DICT_MATCH_CASE);
> +        if (e_mafd)
> +            mafd = strtod(e_mafd->value, &tail);
> +        if (*tail || mafd == HUGE_VAL) {
> +            s->sad(crnt->data[0], crnt->linesize[0], next->data[0],
> next->linesize[0], crnt->width, crnt->height, &sad);
> +            emms_c();
> +            mafd = (double)sad * 100.0 / (crnt->width * crnt->height) / (1
> << s->bitdepth);

Ditto.

> +        }
>          diff = fabs(mafd - s->prev_mafd);
>          ret  = av_clipf(FFMIN(mafd, diff), 0, 100.0);
>          s->prev_mafd = mafd;
> --
> 2.21.0
>
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