The speed option allows to have a constant (per frame) change of hue.
This allows for an easy way of creating an color changing effect without
relying on somewhat complicated expressions.
Signed-off-by: Yannis Gerlach <ffm...@ygerlach.de>
---
libavfilter/vf_colorize.c | 17 +++++++++++++----
1 file changed, 13 insertions(+), 4 deletions(-)
diff --git a/libavfilter/vf_colorize.c b/libavfilter/vf_colorize.c
index e6c563e3e2..ad8577c8fd 100644
--- a/libavfilter/vf_colorize.c
+++ b/libavfilter/vf_colorize.c
@@ -29,6 +29,7 @@ typedef struct ColorizeContext {
float saturation;
float lightness;
float mix;
+ float speed;
int depth;
int c[3];
@@ -205,6 +206,13 @@ static int filter_frame(AVFilterLink *inlink,
AVFrame *frame)
ff_filter_execute(ctx, do_slice, frame, NULL,
FFMIN(s->planeheight[1],
ff_filter_get_nb_threads(ctx)));
+ s->hue += s->speed;
+ if (s->hue < 0.f) {
+ s->hue += 360.f;
+ } else if(s->hue > 360.f) {
+ s->hue -= 360.f;
+ }
+
return ff_filter_frame(ctx->outputs[0], frame);
}
@@ -263,10 +271,11 @@ static const AVFilterPad colorize_inputs[] = {
#define VF
AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption colorize_options[] = {
- { "hue", "set the hue", OFFSET(hue),
AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, 360, VF },
- { "saturation", "set the saturation",
OFFSET(saturation), AV_OPT_TYPE_FLOAT, {.dbl=0.5},0, 1, VF },
- { "lightness", "set the lightness",
OFFSET(lightness), AV_OPT_TYPE_FLOAT, {.dbl=0.5},0, 1, VF },
- { "mix", "set the mix of source lightness", OFFSET(mix),
AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 1, VF },
+ { "hue", "set the hue", OFFSET(hue),
AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, 360, VF },
+ { "saturation", "set the saturation",
OFFSET(saturation), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, 0, 1, VF },
+ { "lightness", "set the lightness",
OFFSET(lightness), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, 0, 1, VF },
+ { "mix", "set the mix of source lightness", OFFSET(mix),
AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 1, VF },
+ { "speed", "set the change of hue per frame", OFFSET(speed),
AV_OPT_TYPE_FLOAT, {.dbl=0}, -180, 180, VF },
{ NULL }
};
-- 2.34.1
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