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avfilter/vf_xfade: add dissolve transition

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This commit is contained in:
Paul B Mahol 2020-02-07 22:00:14 +01:00
parent bfdd6304fb
commit e3e5598290
2 changed files with 37 additions and 0 deletions
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1
doc/filters.texi
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@ -19984,6 +19984,7 @@ Set one of available transition effects:
@item vertclose
@item horzopen
@item horzclose
@item dissolve
@end table
Default transition effect is fade.

36
libavfilter/vf_xfade.c
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@ -55,6 +55,7 @@ enum XFadeTransitions {
VERTCLOSE,
HORZOPEN,
HORZCLOSE,
DISSOLVE,
NB_TRANSITIONS,
};
@ -162,6 +163,7 @@ static const AVOption xfade_options[] = {
{ "vertclose", "vert close transition", 0, AV_OPT_TYPE_CONST, {.i64=VERTCLOSE}, 0, 0, FLAGS, "transition" },
{ "horzopen", "horz open transition", 0, AV_OPT_TYPE_CONST, {.i64=HORZOPEN}, 0, 0, FLAGS, "transition" },
{ "horzclose", "horz close transition", 0, AV_OPT_TYPE_CONST, {.i64=HORZCLOSE}, 0, 0, FLAGS, "transition" },
{ "dissolve", "dissolve transition", 0, AV_OPT_TYPE_CONST, {.i64=DISSOLVE}, 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 },
@ -974,6 +976,39 @@ static void horzclose##name##_transition(AVFilterContext *ctx,
HORZCLOSE_TRANSITION(8, uint8_t, 1)
HORZCLOSE_TRANSITION(16, uint16_t, 2)
static float frand(int x, int y)
{
const float r = sinf(x * 12.9898f + y * 78.233f) * 43758.545f;
return r - floorf(r);
}
#define DISSOLVE_TRANSITION(name, type, div) \
static void dissolve##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; \
\
for (int y = slice_start; y < slice_end; y++) { \
for (int x = 0; x < width; x++) { \
const float smooth = frand(x, y) * 2.f + progress * 2.f - 1.5f; \
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] = smooth >= 0.5f ? xf0[x] : xf1[x]; \
} \
} \
} \
}
DISSOLVE_TRANSITION(8, uint8_t, 1)
DISSOLVE_TRANSITION(16, uint16_t, 2)
static inline double getpix(void *priv, double x, double y, int plane, int nb)
{
XFadeContext *s = priv;
@ -1090,6 +1125,7 @@ static int config_output(AVFilterLink *outlink)
case VERTCLOSE: s->transitionf = s->depth <= 8 ? vertclose8_transition : vertclose16_transition; break;
case HORZOPEN: s->transitionf = s->depth <= 8 ? horzopen8_transition : horzopen16_transition; break;
case HORZCLOSE: s->transitionf = s->depth <= 8 ? horzclose8_transition : horzclose16_transition; break;
case DISSOLVE: s->transitionf = s->depth <= 8 ? dissolve8_transition : dissolve16_transition; break;
}
if (s->transition == CUSTOM) {