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avfilter/palettegen: export color quantization ratio

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This commit is contained in:
Clément Bœsch 2015-02-25 15:34:13 +01:00
parent 7faa40af98
commit ab093bdeef
3 changed files with 19 additions and 3 deletions
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5
doc/filters.texi
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@ -6980,6 +6980,11 @@ the background is static.
Default value is @var{full}.
@end table
The filter also exports the frame metadata @code{lavfi.color_quant_ratio}
(@code{nb_color_in / nb_color_out}) which you can use to evaluate the degree of
color quantization of the palette. This information is also visible at
@var{info} logging level.
@subsection Examples
@itemize

2
libavfilter/version.h
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@ -31,7 +31,7 @@
#define LIBAVFILTER_VERSION_MAJOR 5
#define LIBAVFILTER_VERSION_MINOR 11
#define LIBAVFILTER_VERSION_MICRO 101
#define LIBAVFILTER_VERSION_MICRO 102
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \

15
libavfilter/vf_palettegen.c
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@ -275,6 +275,15 @@ static struct color_ref **load_color_refs(const struct hist_node *hist, int nb_r
return refs;
}
static double set_colorquant_ratio_meta(AVFrame *out, int nb_out, int nb_in)
{
char buf[32];
const double ratio = (double)nb_out / nb_in;
snprintf(buf, sizeof(buf), "%f", ratio);
av_dict_set(&out->metadata, "lavfi.color_quant_ratio", buf, 0);
return ratio;
}
/**
* Main function implementing the Median Cut Algorithm defined by Paul Heckbert
* in Color Image Quantization for Frame Buffer Display (1982)
@ -284,6 +293,7 @@ static AVFrame *get_palette_frame(AVFilterContext *ctx)
AVFrame *out;
PaletteGenContext *s = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
double ratio;
int box_id = 0;
struct range_box *box;
@ -362,8 +372,9 @@ static AVFrame *get_palette_frame(AVFilterContext *ctx)
box = box_id >= 0 ? &s->boxes[box_id] : NULL;
}
av_log(ctx, AV_LOG_DEBUG, "%d%s boxes generated out of %d colors\n",
s->nb_boxes, s->reserve_transparent ? "(+1)" : "", s->nb_refs);
ratio = set_colorquant_ratio_meta(out, s->nb_boxes, s->nb_refs);
av_log(ctx, AV_LOG_INFO, "%d%s colors generated out of %d colors; ratio=%f\n",
s->nb_boxes, s->reserve_transparent ? "(+1)" : "", s->nb_refs, ratio);
qsort(s->boxes, s->nb_boxes, sizeof(*s->boxes), cmp_color);