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avfilter/vf_chromahold: implement blend option

This commit is contained in:
Paul B Mahol 2019-05-13 12:10:22 +02:00
parent dcc999819d
commit f1c9d6fe70
2 changed files with 12 additions and 1 deletions
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5
doc/filters.texi
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@ -6449,6 +6449,11 @@ The color which will not be replaced with neutral chroma.
Similarity percentage with the above color.
0.01 matches only the exact key color, while 1.0 matches everything.
@item blend
Blend percentage.
0.0 makes pixels either fully gray, or not gray at all.
Higher values result in more preserved color.
@item yuv
Signals that the color passed is already in YUV instead of RGB.

8
libavfilter/vf_chromakey.c
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@ -128,7 +128,12 @@ static int do_chromahold_slice(AVFilterContext *avctx, void *arg, int jobnr, int
diff = sqrt((du * du + dv * dv) / (255.0 * 255.0));
alpha = diff > ctx->similarity;
if (alpha) {
if (ctx->blend > 0.0001) {
double f = 1. - av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0);
frame->data[1][frame->linesize[1] * y + x] = 128 + (u - 128) * f;
frame->data[2][frame->linesize[2] * y + x] = 128 + (v - 128) * f;
} else if (alpha) {
frame->data[1][frame->linesize[1] * y + x] = 128;
frame->data[2][frame->linesize[2] * y + x] = 128;
}
@ -262,6 +267,7 @@ AVFilter ff_vf_chromakey = {
static const AVOption chromahold_options[] = {
{ "color", "set the chromahold key color", OFFSET(chromakey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS },
{ "similarity", "set the chromahold similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.01, 1.0, FLAGS },
{ "blend", "set the chromahold blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
{ "yuv", "color parameter is in yuv instead of rgb", OFFSET(is_yuv), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
{ NULL }
};