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FFmpeg/libavfilter/vf_fade.c
Andreas Rheinhardt 2f62a433f2 avfilter: Deduplicate default video inputs/outputs 
Lots of video filters use a very simple input or output:
An array with a single AVFilterPad whose name is "default"
and whose type is AVMEDIA_TYPE_VIDEO; everything else is unset.

Given that we never use pointer equality for inputs or outputs*,
we can simply use a single AVFilterPad instead of dozens; this
even saves .data.rel.ro (8312B here) as well as relocations.

*: In fact, several filters (like the filters in vf_lut.c)
already use the same outputs; furthermore, ff_filter_alloc()
duplicates the input and output pads so that we do not even
work with the pads directly.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2023-08-07 09:21:13 +02:00

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/*
* Copyright (c) 2010 Brandon Mintern
* Copyright (c) 2007 Bobby Bingham
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* video fade filter
* based heavily on vf_negate.c by Bobby Bingham
*/
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/common.h"
#include "libavutil/eval.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "drawutils.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
#define R 0
#define G 1
#define B 2
#define A 3
#define Y 0
#define U 1
#define V 2
#define FADE_IN 0
#define FADE_OUT 1
typedef struct FadeContext {
const AVClass *class;
int type;
int factor, fade_per_frame;
int start_frame, nb_frames;
int hsub, vsub, bpp, depth;
unsigned int black_level, black_level_scaled;
uint8_t is_rgb;
uint8_t is_packed_rgb;
uint8_t rgba_map[4];
int alpha;
int is_planar;
uint64_t start_time, duration;
uint64_t start_time_pts, duration_pts;
enum {VF_FADE_WAITING=0, VF_FADE_FADING, VF_FADE_DONE} fade_state;
uint8_t color_rgba[4]; ///< fade color
int black_fade; ///< if color_rgba is black
int (*filter_slice_luma)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
int (*filter_slice_chroma)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
int (*filter_slice_alpha)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
} FadeContext;
static av_cold int init(AVFilterContext *ctx)
{
FadeContext *s = ctx->priv;
s->fade_per_frame = (1 << 16) / s->nb_frames;
s->fade_state = VF_FADE_WAITING;
if (s->duration != 0) {
// If duration (seconds) is non-zero, assume that we are not fading based on frames
s->nb_frames = 0; // Mostly to clean up logging
}
// Choose what to log. If both time-based and frame-based options, both lines will be in the log
if (s->start_frame || s->nb_frames) {
av_log(ctx, AV_LOG_VERBOSE,
"type:%s start_frame:%d nb_frames:%d alpha:%d\n",
s->type == FADE_IN ? "in" : "out", s->start_frame,
s->nb_frames,s->alpha);
}
if (s->start_time || s->duration) {
av_log(ctx, AV_LOG_VERBOSE,
"type:%s start_time:%f duration:%f alpha:%d\n",
s->type == FADE_IN ? "in" : "out", (s->start_time / (double)AV_TIME_BASE),
(s->duration / (double)AV_TIME_BASE),s->alpha);
}
s->black_fade = !memcmp(s->color_rgba, "\x00\x00\x00\xff", 4);
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
const FadeContext *s = ctx->priv;
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P,
AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUVJ440P,
AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR,
AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA,
AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV440P12,
AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
AV_PIX_FMT_NONE
};
static const enum AVPixelFormat pix_fmts_rgb[] = {
AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR,
AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA,
AV_PIX_FMT_GBRP,
AV_PIX_FMT_NONE
};
static const enum AVPixelFormat pix_fmts_alpha[] = {
AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR,
AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA,
AV_PIX_FMT_GBRAP,
AV_PIX_FMT_NONE
};
static const enum AVPixelFormat pix_fmts_rgba[] = {
AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR,
AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA,
AV_PIX_FMT_GBRAP,
AV_PIX_FMT_NONE
};
const enum AVPixelFormat *pixel_fmts;
if (s->alpha) {
if (s->black_fade)
pixel_fmts = pix_fmts_alpha;
else
pixel_fmts = pix_fmts_rgba;
} else {
if (s->black_fade)
pixel_fmts = pix_fmts;
else
pixel_fmts = pix_fmts_rgb;
}
return ff_set_common_formats_from_list(ctx, pixel_fmts);
}
const static enum AVPixelFormat studio_level_pix_fmts[] = {
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P,
AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
AV_PIX_FMT_YUV440P,
AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV440P12,
AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
AV_PIX_FMT_NONE
};
static av_always_inline void filter_rgb(FadeContext *s, const AVFrame *frame,
int slice_start, int slice_end,
int do_alpha, int step)
{
int i, j;
const uint8_t r_idx = s->rgba_map[R];
const uint8_t g_idx = s->rgba_map[G];
const uint8_t b_idx = s->rgba_map[B];
const uint8_t a_idx = s->rgba_map[A];
const uint8_t *c = s->color_rgba;
for (i = slice_start; i < slice_end; i++) {
uint8_t *p = frame->data[0] + i * frame->linesize[0];
for (j = 0; j < frame->width; j++) {
#define INTERP(c_name, c_idx) av_clip_uint8(((c[c_idx]<<16) + ((int)p[c_name] - (int)c[c_idx]) * s->factor + (1<<15)) >> 16)
p[r_idx] = INTERP(r_idx, 0);
p[g_idx] = INTERP(g_idx, 1);
p[b_idx] = INTERP(b_idx, 2);
if (do_alpha)
p[a_idx] = INTERP(a_idx, 3);
p += step;
}
}
}
static av_always_inline void filter_rgb_planar(FadeContext *s, const AVFrame *frame,
int slice_start, int slice_end,
int do_alpha)
{
int i, j;
const uint8_t *c = s->color_rgba;
for (i = slice_start; i < slice_end; i++) {
uint8_t *pg = frame->data[0] + i * frame->linesize[0];
uint8_t *pb = frame->data[1] + i * frame->linesize[1];
uint8_t *pr = frame->data[2] + i * frame->linesize[2];
uint8_t *pa = frame->data[3] + i * frame->linesize[3];
for (j = 0; j < frame->width; j++) {
#define INTERPP(c_name, c_idx) av_clip_uint8(((c[c_idx]<<16) + ((int)c_name - (int)c[c_idx]) * s->factor + (1<<15)) >> 16)
pr[j] = INTERPP(pr[j], 0);
pg[j] = INTERPP(pg[j], 1);
pb[j] = INTERPP(pb[j], 2);
if (do_alpha)
pa[j] = INTERPP(pa[j], 3);
}
}
}
static int filter_slice_rgb(AVFilterContext *ctx, void *arg, int jobnr,
int nb_jobs)
{
FadeContext *s = ctx->priv;
AVFrame *frame = arg;
int slice_start = (frame->height * jobnr ) / nb_jobs;
int slice_end = (frame->height * (jobnr+1)) / nb_jobs;
if (s->is_planar && s->alpha)
filter_rgb_planar(s, frame, slice_start, slice_end, 1);
else if (s->is_planar)
filter_rgb_planar(s, frame, slice_start, slice_end, 0);
else if (s->alpha) filter_rgb(s, frame, slice_start, slice_end, 1, 4);
else if (s->bpp == 3) filter_rgb(s, frame, slice_start, slice_end, 0, 3);
else if (s->bpp == 4) filter_rgb(s, frame, slice_start, slice_end, 0, 4);
else av_assert0(0);
return 0;
}
static int filter_slice_luma(AVFilterContext *ctx, void *arg, int jobnr,
int nb_jobs)
{
FadeContext *s = ctx->priv;
AVFrame *frame = arg;
int slice_start = (frame->height * jobnr ) / nb_jobs;
int slice_end = (frame->height * (jobnr+1)) / nb_jobs;
int i, j;
for (int k = 0; k < 1 + 2 * (s->is_planar && s->is_rgb); k++) {
for (i = slice_start; i < slice_end; i++) {
uint8_t *p = frame->data[k] + i * frame->linesize[k];
for (j = 0; j < frame->width * s->bpp; j++) {
/* s->factor is using 16 lower-order bits for decimal
* places. 32768 = 1 << 15, it is an integer representation
* of 0.5 and is for rounding. */
*p = ((*p - s->black_level) * s->factor + s->black_level_scaled) >> 16;
p++;
}
}
}
return 0;
}
static int filter_slice_luma16(AVFilterContext *ctx, void *arg, int jobnr,
int nb_jobs)
{
FadeContext *s = ctx->priv;
AVFrame *frame = arg;
int slice_start = (frame->height * jobnr ) / nb_jobs;
int slice_end = (frame->height * (jobnr+1)) / nb_jobs;
int i, j;
for (int k = 0; k < 1 + 2 * (s->is_planar && s->is_rgb); k++) {
for (i = slice_start; i < slice_end; i++) {
uint16_t *p = (uint16_t *)(frame->data[k] + i * frame->linesize[k]);
for (j = 0; j < frame->width * s->bpp; j++) {
/* s->factor is using 16 lower-order bits for decimal
* places. 32768 = 1 << 15, it is an integer representation
* of 0.5 and is for rounding. */
*p = ((*p - s->black_level) * s->factor + s->black_level_scaled) >> 16;
p++;
}
}
}
return 0;
}
static int filter_slice_chroma(AVFilterContext *ctx, void *arg, int jobnr,
int nb_jobs)
{
FadeContext *s = ctx->priv;
AVFrame *frame = arg;
int i, j, plane;
const int width = AV_CEIL_RSHIFT(frame->width, s->hsub);
const int height= AV_CEIL_RSHIFT(frame->height, s->vsub);
int slice_start = (height * jobnr ) / nb_jobs;
int slice_end = FFMIN(((height * (jobnr+1)) / nb_jobs), frame->height);
for (plane = 1; plane < 3; plane++) {
for (i = slice_start; i < slice_end; i++) {
uint8_t *p = frame->data[plane] + i * frame->linesize[plane];
for (j = 0; j < width; j++) {
/* 8421367 = ((128 << 1) + 1) << 15. It is an integer
* representation of 128.5. The .5 is for rounding
* purposes. */
*p = ((*p - 128) * s->factor + 8421367) >> 16;
p++;
}
}
}
return 0;
}
static int filter_slice_chroma16(AVFilterContext *ctx, void *arg, int jobnr,
int nb_jobs)
{
FadeContext *s = ctx->priv;
AVFrame *frame = arg;
int i, j, plane;
const int width = AV_CEIL_RSHIFT(frame->width, s->hsub);
const int height= AV_CEIL_RSHIFT(frame->height, s->vsub);
const int mid = 1 << (s->depth - 1);
const int add = ((mid << 1) + 1) << 15;
int slice_start = (height * jobnr ) / nb_jobs;
int slice_end = FFMIN(((height * (jobnr+1)) / nb_jobs), frame->height);
for (plane = 1; plane < 3; plane++) {
for (i = slice_start; i < slice_end; i++) {
uint16_t *p = (uint16_t *)(frame->data[plane] + i * frame->linesize[plane]);
for (j = 0; j < width; j++) {
*p = ((*p - mid) * s->factor + add) >> 16;
p++;
}
}
}
return 0;
}
static int filter_slice_alpha(AVFilterContext *ctx, void *arg, int jobnr,
int nb_jobs)
{
FadeContext *s = ctx->priv;
AVFrame *frame = arg;
int plane = s->is_packed_rgb ? 0 : A;
int slice_start = (frame->height * jobnr ) / nb_jobs;
int slice_end = (frame->height * (jobnr+1)) / nb_jobs;
int i, j;
for (i = slice_start; i < slice_end; i++) {
uint8_t *p = frame->data[plane] + i * frame->linesize[plane] + s->is_packed_rgb*s->rgba_map[A];
int step = s->is_packed_rgb ? 4 : 1;
for (j = 0; j < frame->width; j++) {
/* s->factor is using 16 lower-order bits for decimal
* places. 32768 = 1 << 15, it is an integer representation
* of 0.5 and is for rounding. */
*p = ((*p - s->black_level) * s->factor + s->black_level_scaled) >> 16;
p += step;
}
}
return 0;
}
static int filter_slice_alpha16(AVFilterContext *ctx, void *arg, int jobnr,
int nb_jobs)
{
FadeContext *s = ctx->priv;
AVFrame *frame = arg;
int plane = s->is_packed_rgb ? 0 : A;
int slice_start = (frame->height * jobnr ) / nb_jobs;
int slice_end = (frame->height * (jobnr+1)) / nb_jobs;
int i, j;
for (i = slice_start; i < slice_end; i++) {
uint16_t *p = (uint16_t *)(frame->data[plane] + i * frame->linesize[plane]) + s->is_packed_rgb*s->rgba_map[A];
int step = s->is_packed_rgb ? 4 : 1;
for (j = 0; j < frame->width; j++) {
/* s->factor is using 16 lower-order bits for decimal
* places. 32768 = 1 << 15, it is an integer representation
* of 0.5 and is for rounding. */
*p = ((*p - s->black_level) * s->factor + s->black_level_scaled) >> 16;
p += step;
}
}
return 0;
}
static int config_input(AVFilterLink *inlink)
{
FadeContext *s = inlink->dst->priv;
const AVPixFmtDescriptor *pixdesc = av_pix_fmt_desc_get(inlink->format);
s->hsub = pixdesc->log2_chroma_w;
s->vsub = pixdesc->log2_chroma_h;
ff_fill_rgba_map(s->rgba_map, inlink->format);
s->depth = pixdesc->comp[0].depth;
s->bpp = pixdesc->flags & AV_PIX_FMT_FLAG_PLANAR ?
1 :
av_get_bits_per_pixel(pixdesc) >> 3;
s->alpha &= !!(pixdesc->flags & AV_PIX_FMT_FLAG_ALPHA);
s->is_planar = pixdesc->flags & AV_PIX_FMT_FLAG_PLANAR;
s->is_rgb = pixdesc->flags & AV_PIX_FMT_FLAG_RGB;
s->is_packed_rgb = !s->is_planar && s->is_rgb;
if (s->duration)
s->duration_pts = av_rescale_q(s->duration, AV_TIME_BASE_Q, inlink->time_base);
if (s->start_time)
s->start_time_pts = av_rescale_q(s->start_time, AV_TIME_BASE_Q, inlink->time_base);
/* use CCIR601/709 black level for studio-level pixel non-alpha components */
s->black_level =
ff_fmt_is_in(inlink->format, studio_level_pix_fmts) && !s->alpha ? 16 * (1 << (s->depth - 8)): 0;
/* 32768 = 1 << 15, it is an integer representation
* of 0.5 and is for rounding. */
s->black_level_scaled = (s->black_level << 16) + 32768;
s->filter_slice_luma = s->depth <= 8 ? filter_slice_luma : filter_slice_luma16;
s->filter_slice_chroma = s->depth <= 8 ? filter_slice_chroma : filter_slice_chroma16;
s->filter_slice_alpha = s->depth <= 8 ? filter_slice_alpha : filter_slice_alpha16;
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
AVFilterContext *ctx = inlink->dst;
FadeContext *s = ctx->priv;
// Calculate Fade assuming this is a Fade In
if (s->fade_state == VF_FADE_WAITING) {
s->factor=0;
if (frame->pts >= s->start_time_pts
&& inlink->frame_count_out >= s->start_frame) {
// Time to start fading
s->fade_state = VF_FADE_FADING;
// Save start time in case we are starting based on frames and fading based on time
if (s->start_time_pts == 0 && s->start_frame != 0) {
s->start_time_pts = frame->pts;
}
// Save start frame in case we are starting based on time and fading based on frames
if (s->start_time_pts != 0 && s->start_frame == 0) {
s->start_frame = inlink->frame_count_out;
}
}
}
if (s->fade_state == VF_FADE_FADING) {
if (s->duration_pts == 0) {
// Fading based on frame count
s->factor = (inlink->frame_count_out - s->start_frame) * s->fade_per_frame;
if (inlink->frame_count_out > s->start_frame + s->nb_frames) {
s->fade_state = VF_FADE_DONE;
}
} else {
// Fading based on duration
s->factor = (frame->pts - s->start_time_pts) * UINT16_MAX / s->duration_pts;
if (frame->pts > s->start_time_pts + s->duration_pts) {
s->fade_state = VF_FADE_DONE;
}
}
}
if (s->fade_state == VF_FADE_DONE) {
s->factor=UINT16_MAX;
}
s->factor = av_clip_uint16(s->factor);
// Invert fade_factor if Fading Out
if (s->type == FADE_OUT) {
s->factor=UINT16_MAX-s->factor;
}
if (s->factor < UINT16_MAX) {
if (s->alpha) {
ff_filter_execute(ctx, s->filter_slice_alpha, frame, NULL,
FFMIN(frame->height, ff_filter_get_nb_threads(ctx)));
} else if (s->is_rgb && !s->black_fade) {
ff_filter_execute(ctx, filter_slice_rgb, frame, NULL,
FFMIN(frame->height, ff_filter_get_nb_threads(ctx)));
} else {
/* luma, or rgb plane in case of black */
ff_filter_execute(ctx, s->filter_slice_luma, frame, NULL,
FFMIN(frame->height, ff_filter_get_nb_threads(ctx)));
if (frame->data[1] && frame->data[2] && !s->is_rgb) {
/* chroma planes */
ff_filter_execute(ctx, s->filter_slice_chroma, frame, NULL,
FFMIN(frame->height, ff_filter_get_nb_threads(ctx)));
}
}
}
return ff_filter_frame(inlink->dst->outputs[0], frame);
}
#define OFFSET(x) offsetof(FadeContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption fade_options[] = {
{ "type", "set the fade direction", OFFSET(type), AV_OPT_TYPE_INT, { .i64 = FADE_IN }, FADE_IN, FADE_OUT, FLAGS, "type" },
{ "t", "set the fade direction", OFFSET(type), AV_OPT_TYPE_INT, { .i64 = FADE_IN }, FADE_IN, FADE_OUT, FLAGS, "type" },
{ "in", "fade-in", 0, AV_OPT_TYPE_CONST, { .i64 = FADE_IN }, .flags = FLAGS, .unit = "type" },
{ "out", "fade-out", 0, AV_OPT_TYPE_CONST, { .i64 = FADE_OUT }, .flags = FLAGS, .unit = "type" },
{ "start_frame", "Number of the first frame to which to apply the effect.",
OFFSET(start_frame), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
{ "s", "Number of the first frame to which to apply the effect.",
OFFSET(start_frame), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
{ "nb_frames", "Number of frames to which the effect should be applied.",
OFFSET(nb_frames), AV_OPT_TYPE_INT, { .i64 = 25 }, 1, INT_MAX, FLAGS },
{ "n", "Number of frames to which the effect should be applied.",
OFFSET(nb_frames), AV_OPT_TYPE_INT, { .i64 = 25 }, 1, INT_MAX, FLAGS },
{ "alpha", "fade alpha if it is available on the input", OFFSET(alpha), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, FLAGS },
{ "start_time", "Number of seconds of the beginning of the effect.",
OFFSET(start_time), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT64_MAX, FLAGS },
{ "st", "Number of seconds of the beginning of the effect.",
OFFSET(start_time), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT64_MAX, FLAGS },
{ "duration", "Duration of the effect in seconds.",
OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT64_MAX, FLAGS },
{ "d", "Duration of the effect in seconds.",
OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT64_MAX, FLAGS },
{ "color", "set color", OFFSET(color_rgba), AV_OPT_TYPE_COLOR, {.str = "black"}, 0, 0, FLAGS },
{ "c", "set color", OFFSET(color_rgba), AV_OPT_TYPE_COLOR, {.str = "black"}, 0, 0, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(fade);
static const AVFilterPad avfilter_vf_fade_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
.config_props = config_input,
.filter_frame = filter_frame,
},
};
const AVFilter ff_vf_fade = {
.name = "fade",
.description = NULL_IF_CONFIG_SMALL("Fade in/out input video."),
.init = init,
.priv_size = sizeof(FadeContext),
.priv_class = &fade_class,
FILTER_INPUTS(avfilter_vf_fade_inputs),
FILTER_OUTPUTS(ff_video_default_filterpad),
FILTER_QUERY_FUNC(query_formats),
.flags = AVFILTER_FLAG_SLICE_THREADS |
AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
};
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