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avfilter/vsrc_gradients: add speed option

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This commit is contained in:
Paul B Mahol 2020-08-31 11:04:38 +02:00
parent 823eb009cb
commit eb9fa00bcc
2 changed files with 6 additions and 1 deletions
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3
doc/filters.texi
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@ -22577,6 +22577,9 @@ for the accepted syntax.
If not specified, or the expressed duration is negative, the video is
supposed to be generated forever.
@item speed
Set speed of gradients rotation.
@end table

4
libavfilter/vsrc_gradients.c
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@ -38,6 +38,7 @@ typedef struct GradientsContext {
AVRational frame_rate;
int64_t pts;
int64_t duration; ///< duration expressed in microseconds
float speed;
uint8_t color_rgba[8][4];
int nb_colors;
@ -75,6 +76,7 @@ static const AVOption gradients_options[] = {
{"seed", "set the seed", OFFSET(seed), AV_OPT_TYPE_INT64, {.i64=-1}, -1, UINT32_MAX, FLAGS },
{"duration", "set video duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=-1}, -1, INT64_MAX, FLAGS },\
{"d", "set video duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=-1}, -1, INT64_MAX, FLAGS },\
{"speed", "set gradients rotation speed", OFFSET(speed), AV_OPT_TYPE_FLOAT,{.dbl=0.01}, 0.00001, 1, FLAGS },\
{NULL},
};
@ -250,7 +252,7 @@ static int gradients_request_frame(AVFilterLink *outlink)
AVFilterContext *ctx = outlink->src;
GradientsContext *s = ctx->priv;
AVFrame *frame = ff_get_video_buffer(outlink, s->w, s->h);
float angle = fmodf(s->pts / 100.f, 2.f * M_PI);
float angle = fmodf(s->pts * s->speed, 2.f * M_PI);
const float w2 = s->w / 2.f;
const float h2 = s->h / 2.f;