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avfilter/vf_xfade: add zoomin transition

This commit is contained in:
Paul B Mahol 2021-09-12 14:56:56 +02:00
parent b35653d4c4
commit 1db828db8b
2 changed files with 48 additions and 0 deletions
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1
doc/filters.texi
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@ -22440,6 +22440,7 @@ Set one of available transition effects:
@item wipebr
@item squeezeh
@item squeezev
@item zoomin
@end table
Default transition effect is fade.

47
libavfilter/vf_xfade.c
View File

@ -73,6 +73,7 @@ enum XFadeTransitions {
WIPEBR,
SQUEEZEH,
SQUEEZEV,
ZOOMIN,
NB_TRANSITIONS,
};
@ -196,6 +197,7 @@ static const AVOption xfade_options[] = {
{ "wipebr", "wipe br transition", 0, AV_OPT_TYPE_CONST, {.i64=WIPEBR}, 0, 0, FLAGS, "transition" },
{ "squeezeh", "squeeze h transition", 0, AV_OPT_TYPE_CONST, {.i64=SQUEEZEH}, 0, 0, FLAGS, "transition" },
{ "squeezev", "squeeze v transition", 0, AV_OPT_TYPE_CONST, {.i64=SQUEEZEV}, 0, 0, FLAGS, "transition" },
{ "zoomin", "zoom in transition", 0, AV_OPT_TYPE_CONST, {.i64=ZOOMIN}, 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 },
@ -1629,6 +1631,50 @@ static void squeezev##name##_transition(AVFilterContext *ctx,
SQUEEZEV_TRANSITION(8, uint8_t, 1)
SQUEEZEV_TRANSITION(16, uint16_t, 2)
static void zoom(float *u, float *v, float amount)
{
*u = 0.5f + ((*u - 0.5f) * amount);
*v = 0.5f + ((*v - 0.5f) * amount);
}
#define ZOOMIN_TRANSITION(name, type, div) \
static void zoomin##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 float w = out->width; \
const float h = out->height; \
const float zf = smoothstep(0.5f, 1.f, progress); \
\
for (int p = 0; p < s->nb_planes; p++) { \
const type *xf0 = (const type *)(a->data[p]); \
const type *xf1 = (const type *)(b->data[p] + slice_start * b->linesize[p]); \
type *dst = (type *)(out->data[p] + slice_start * out->linesize[p]); \
\
for (int y = slice_start; y < slice_end; y++) { \
for (int x = 0; x < w; x++) { \
float zv, u, v; \
int iu, iv; \
\
u = x / w; \
v = y / h; \
zoom(&u, &v, zf); \
iu = ceilf(u * (w - 1)); \
iv = ceilf(v * (h - 1)); \
zv = xf0[iu + iv * a->linesize[p] / div]; \
dst[x] = mix(zv, xf1[x], smoothstep(0.f, 0.5f, progress)); \
} \
dst += out->linesize[p] / div; \
xf1 += b->linesize[p] / div; \
} \
} \
}
ZOOMIN_TRANSITION(8, uint8_t, 1)
ZOOMIN_TRANSITION(16, uint16_t, 2)
static inline double getpix(void *priv, double x, double y, int plane, int nb)
{
XFadeContext *s = priv;
@ -1778,6 +1824,7 @@ static int config_output(AVFilterLink *outlink)
case WIPEBR: s->transitionf = s->depth <= 8 ? wipebr8_transition : wipebr16_transition; break;
case SQUEEZEH: s->transitionf = s->depth <= 8 ? squeezeh8_transition : squeezeh16_transition; break;
case SQUEEZEV: s->transitionf = s->depth <= 8 ? squeezev8_transition : squeezev16_transition; break;
case ZOOMIN: s->transitionf = s->depth <= 8 ? zoomin8_transition : zoomin16_transition; break;
}
if (s->transition == CUSTOM) {