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Code Issues Releases Activity

avfilter/vf_xfade: add radial transition

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This commit is contained in:
Paul B Mahol 2020-01-30 17:20:31 +01:00
parent b99ed6e428
commit 0a275fec62
2 changed files with 32 additions and 0 deletions
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1
doc/filters.texi
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@ -20060,6 +20060,7 @@ Set one of available transition effects:
@item distance
@item fadeblack
@item fadewhite
@item radial
@end table
Default transition effect is fade.

31
libavfilter/vf_xfade.c
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@ -45,6 +45,7 @@ enum XFadeTransitions {
DISTANCE,
FADEBLACK,
FADEWHITE,
RADIAL,
NB_TRANSITIONS,
};
@ -141,6 +142,7 @@ static const AVOption xfade_options[] = {
{ "distance", "distance transition", 0, AV_OPT_TYPE_CONST, {.i64=DISTANCE}, 0, 0, FLAGS, "transition" },
{ "fadeblack", "fadeblack transition", 0, AV_OPT_TYPE_CONST, {.i64=FADEBLACK}, 0, 0, FLAGS, "transition" },
{ "fadewhite", "fadewhite transition", 0, AV_OPT_TYPE_CONST, {.i64=FADEWHITE}, 0, 0, FLAGS, "transition" },
{ "radial", "radial transition", 0, AV_OPT_TYPE_CONST, {.i64=RADIAL}, 0, 0, FLAGS, "transition" },
{ "duration", "set cross fade duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=1000000}, 0, 60000000, FLAGS },
{ "offset", "set cross fade start relative to first input stream", OFFSET(offset), AV_OPT_TYPE_DURATION, {.i64=0}, INT64_MIN, INT64_MAX, FLAGS },
{ "expr", "set expression for custom transition", OFFSET(custom_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
@ -649,6 +651,34 @@ static void fadewhite##name##_transition(AVFilterContext *ctx,
FADEWHITE_TRANSITION(8, uint8_t, 1)
FADEWHITE_TRANSITION(16, uint16_t, 2)
#define RADIAL_TRANSITION(name, type, div) \
static void radial##name##_transition(AVFilterContext *ctx, \
const AVFrame *a, const AVFrame *b, AVFrame *out, \
float progress, \
int slice_start, int slice_end, int jobnr) \
{ \
XFadeContext *s = ctx->priv; \
const int width = out->width; \
const int height = out->height; \
\
for (int y = slice_start; y < slice_end; y++) { \
for (int x = 0; x < width; x++) { \
const float smooth = atan2f(x - width / 2, y - height / 2) - \
(progress - 0.5f) * (M_PI * 2.5f); \
for (int p = 0; p < s->nb_planes; p++) { \
const type *xf0 = (const type *)(a->data[p] + y * a->linesize[p]); \
const type *xf1 = (const type *)(b->data[p] + y * b->linesize[p]); \
type *dst = (type *)(out->data[p] + y * out->linesize[p]); \
\
dst[x] = mix(xf1[x], xf0[x], smoothstep(0.f, 1.f, smooth)); \
} \
} \
} \
}
RADIAL_TRANSITION(8, uint8_t, 1)
RADIAL_TRANSITION(16, uint16_t, 2)
static inline double getpix(void *priv, double x, double y, int plane, int nb)
{
XFadeContext *s = priv;
@ -754,6 +784,7 @@ static int config_output(AVFilterLink *outlink)
case DISTANCE: s->transitionf = s->depth <= 8 ? distance8_transition : distance16_transition; break;
case FADEBLACK: s->transitionf = s->depth <= 8 ? fadeblack8_transition : fadeblack16_transition; break;
case FADEWHITE: s->transitionf = s->depth <= 8 ? fadewhite8_transition : fadewhite16_transition; break;
case RADIAL: s->transitionf = s->depth <= 8 ? radial8_transition : radial16_transition; break;
}
if (s->transition == CUSTOM) {