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FFmpeg/libavfilter/vf_overlay.c
Andreas Rheinhardt a86ee5fd79 avfilter/vf_overlay: Fix double-free of AVFilterFormats on error 
The query_formats function of the overlay filter tries to allocate
two lists (only one in a special case) of formats which on success
are attached to more permanent objects (AVFilterLinks) for storage
afterwards. If attaching a list to an AVFilterLink succeeds, it is
in turn owned by the AVFilterLink (or more exactly, the AVFilterLink
becomes one of the common owners of the list). Yet if attaching a list
to one of its links succeeds and an error happens lateron, both lists
were manually freed, whic is wrong if the list is already owned by one
or more links; these links' pointers to their lists will become dangling
and there will be a double-free/use-after-free when these links are
cleaned up automatically.

This commit fixes this by removing the custom freeing code; this will
temporarily add a leaking codepath (if attaching a list not already
owned by a link to a link fails, the list will leak), but this will
be fixed soon by making sure that an AVFilterFormats without owner will
be automatically freed when attaching it to an AVFilterLink fails.
Notice that at most one list leaks because a new list is only allocated
after the old list has been successfully attached to a link.

Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
2020-08-23 23:29:58 +02:00

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/*
* Copyright (c) 2010 Stefano Sabatini
* Copyright (c) 2010 Baptiste Coudurier
* 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
* overlay one video on top of another
*/
#include "avfilter.h"
#include "formats.h"
#include "libavutil/common.h"
#include "libavutil/eval.h"
#include "libavutil/avstring.h"
#include "libavutil/pixdesc.h"
#include "libavutil/imgutils.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/timestamp.h"
#include "internal.h"
#include "drawutils.h"
#include "framesync.h"
#include "video.h"
#include "vf_overlay.h"
typedef struct ThreadData {
AVFrame *dst, *src;
} ThreadData;
static const char *const var_names[] = {
"main_w", "W", ///< width of the main video
"main_h", "H", ///< height of the main video
"overlay_w", "w", ///< width of the overlay video
"overlay_h", "h", ///< height of the overlay video
"hsub",
"vsub",
"x",
"y",
"n", ///< number of frame
"pos", ///< position in the file
"t", ///< timestamp expressed in seconds
NULL
};
#define MAIN 0
#define OVERLAY 1
#define R 0
#define G 1
#define B 2
#define A 3
#define Y 0
#define U 1
#define V 2
enum EvalMode {
EVAL_MODE_INIT,
EVAL_MODE_FRAME,
EVAL_MODE_NB
};
static av_cold void uninit(AVFilterContext *ctx)
{
OverlayContext *s = ctx->priv;
ff_framesync_uninit(&s->fs);
av_expr_free(s->x_pexpr); s->x_pexpr = NULL;
av_expr_free(s->y_pexpr); s->y_pexpr = NULL;
}
static inline int normalize_xy(double d, int chroma_sub)
{
if (isnan(d))
return INT_MAX;
return (int)d & ~((1 << chroma_sub) - 1);
}
static void eval_expr(AVFilterContext *ctx)
{
OverlayContext *s = ctx->priv;
s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, NULL);
s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, NULL);
/* It is necessary if x is expressed from y */
s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, NULL);
s->x = normalize_xy(s->var_values[VAR_X], s->hsub);
s->y = normalize_xy(s->var_values[VAR_Y], s->vsub);
}
static int set_expr(AVExpr **pexpr, const char *expr, const char *option, void *log_ctx)
{
int ret;
AVExpr *old = NULL;
if (*pexpr)
old = *pexpr;
ret = av_expr_parse(pexpr, expr, var_names,
NULL, NULL, NULL, NULL, 0, log_ctx);
if (ret < 0) {
av_log(log_ctx, AV_LOG_ERROR,
"Error when evaluating the expression '%s' for %s\n",
expr, option);
*pexpr = old;
return ret;
}
av_expr_free(old);
return 0;
}
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
char *res, int res_len, int flags)
{
OverlayContext *s = ctx->priv;
int ret;
if (!strcmp(cmd, "x"))
ret = set_expr(&s->x_pexpr, args, cmd, ctx);
else if (!strcmp(cmd, "y"))
ret = set_expr(&s->y_pexpr, args, cmd, ctx);
else
ret = AVERROR(ENOSYS);
if (ret < 0)
return ret;
if (s->eval_mode == EVAL_MODE_INIT) {
eval_expr(ctx);
av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d\n",
s->var_values[VAR_X], s->x,
s->var_values[VAR_Y], s->y);
}
return ret;
}
static const enum AVPixelFormat alpha_pix_fmts[] = {
AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10,
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 int query_formats(AVFilterContext *ctx)
{
OverlayContext *s = ctx->priv;
/* overlay formats contains alpha, for avoiding conversion with alpha information loss */
static const enum AVPixelFormat main_pix_fmts_yuv420[] = {
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVA420P,
AV_PIX_FMT_NV12, AV_PIX_FMT_NV21,
AV_PIX_FMT_NONE
};
static const enum AVPixelFormat overlay_pix_fmts_yuv420[] = {
AV_PIX_FMT_YUVA420P, AV_PIX_FMT_NONE
};
static const enum AVPixelFormat main_pix_fmts_yuv420p10[] = {
AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUVA420P10,
AV_PIX_FMT_NONE
};
static const enum AVPixelFormat overlay_pix_fmts_yuv420p10[] = {
AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_NONE
};
static const enum AVPixelFormat main_pix_fmts_yuv422[] = {
AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_NONE
};
static const enum AVPixelFormat overlay_pix_fmts_yuv422[] = {
AV_PIX_FMT_YUVA422P, AV_PIX_FMT_NONE
};
static const enum AVPixelFormat main_pix_fmts_yuv422p10[] = {
AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_NONE
};
static const enum AVPixelFormat overlay_pix_fmts_yuv422p10[] = {
AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_NONE
};
static const enum AVPixelFormat main_pix_fmts_yuv444[] = {
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVA444P, AV_PIX_FMT_NONE
};
static const enum AVPixelFormat overlay_pix_fmts_yuv444[] = {
AV_PIX_FMT_YUVA444P, AV_PIX_FMT_NONE
};
static const enum AVPixelFormat main_pix_fmts_gbrp[] = {
AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_PIX_FMT_NONE
};
static const enum AVPixelFormat overlay_pix_fmts_gbrp[] = {
AV_PIX_FMT_GBRAP, AV_PIX_FMT_NONE
};
static const enum AVPixelFormat main_pix_fmts_rgb[] = {
AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,
AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
AV_PIX_FMT_NONE
};
static const enum AVPixelFormat overlay_pix_fmts_rgb[] = {
AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,
AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
AV_PIX_FMT_NONE
};
const enum AVPixelFormat *main_formats, *overlay_formats;
AVFilterFormats *formats;
int ret;
switch (s->format) {
case OVERLAY_FORMAT_YUV420:
main_formats = main_pix_fmts_yuv420;
overlay_formats = overlay_pix_fmts_yuv420;
break;
case OVERLAY_FORMAT_YUV420P10:
main_formats = main_pix_fmts_yuv420p10;
overlay_formats = overlay_pix_fmts_yuv420p10;
break;
case OVERLAY_FORMAT_YUV422:
main_formats = main_pix_fmts_yuv422;
overlay_formats = overlay_pix_fmts_yuv422;
break;
case OVERLAY_FORMAT_YUV422P10:
main_formats = main_pix_fmts_yuv422p10;
overlay_formats = overlay_pix_fmts_yuv422p10;
break;
case OVERLAY_FORMAT_YUV444:
main_formats = main_pix_fmts_yuv444;
overlay_formats = overlay_pix_fmts_yuv444;
break;
case OVERLAY_FORMAT_RGB:
main_formats = main_pix_fmts_rgb;
overlay_formats = overlay_pix_fmts_rgb;
break;
case OVERLAY_FORMAT_GBRP:
main_formats = main_pix_fmts_gbrp;
overlay_formats = overlay_pix_fmts_gbrp;
break;
case OVERLAY_FORMAT_AUTO:
return ff_set_common_formats(ctx, ff_make_format_list(alpha_pix_fmts));
default:
av_assert0(0);
}
formats = ff_make_format_list(main_formats);
if ((ret = ff_formats_ref(formats, &ctx->inputs[MAIN]->out_formats)) < 0 ||
(ret = ff_formats_ref(formats, &ctx->outputs[MAIN]->in_formats)) < 0)
return ret;
return ff_formats_ref(ff_make_format_list(overlay_formats),
&ctx->inputs[OVERLAY]->out_formats);
}
static int config_input_overlay(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
OverlayContext *s = inlink->dst->priv;
int ret;
const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
av_image_fill_max_pixsteps(s->overlay_pix_step, NULL, pix_desc);
/* Finish the configuration by evaluating the expressions
now when both inputs are configured. */
s->var_values[VAR_MAIN_W ] = s->var_values[VAR_MW] = ctx->inputs[MAIN ]->w;
s->var_values[VAR_MAIN_H ] = s->var_values[VAR_MH] = ctx->inputs[MAIN ]->h;
s->var_values[VAR_OVERLAY_W] = s->var_values[VAR_OW] = ctx->inputs[OVERLAY]->w;
s->var_values[VAR_OVERLAY_H] = s->var_values[VAR_OH] = ctx->inputs[OVERLAY]->h;
s->var_values[VAR_HSUB] = 1<<pix_desc->log2_chroma_w;
s->var_values[VAR_VSUB] = 1<<pix_desc->log2_chroma_h;
s->var_values[VAR_X] = NAN;
s->var_values[VAR_Y] = NAN;
s->var_values[VAR_N] = 0;
s->var_values[VAR_T] = NAN;
s->var_values[VAR_POS] = NAN;
if ((ret = set_expr(&s->x_pexpr, s->x_expr, "x", ctx)) < 0 ||
(ret = set_expr(&s->y_pexpr, s->y_expr, "y", ctx)) < 0)
return ret;
s->overlay_is_packed_rgb =
ff_fill_rgba_map(s->overlay_rgba_map, inlink->format) >= 0;
s->overlay_has_alpha = ff_fmt_is_in(inlink->format, alpha_pix_fmts);
if (s->eval_mode == EVAL_MODE_INIT) {
eval_expr(ctx);
av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d\n",
s->var_values[VAR_X], s->x,
s->var_values[VAR_Y], s->y);
}
av_log(ctx, AV_LOG_VERBOSE,
"main w:%d h:%d fmt:%s overlay w:%d h:%d fmt:%s\n",
ctx->inputs[MAIN]->w, ctx->inputs[MAIN]->h,
av_get_pix_fmt_name(ctx->inputs[MAIN]->format),
ctx->inputs[OVERLAY]->w, ctx->inputs[OVERLAY]->h,
av_get_pix_fmt_name(ctx->inputs[OVERLAY]->format));
return 0;
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
OverlayContext *s = ctx->priv;
int ret;
if ((ret = ff_framesync_init_dualinput(&s->fs, ctx)) < 0)
return ret;
outlink->w = ctx->inputs[MAIN]->w;
outlink->h = ctx->inputs[MAIN]->h;
outlink->time_base = ctx->inputs[MAIN]->time_base;
return ff_framesync_configure(&s->fs);
}
// divide by 255 and round to nearest
// apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
#define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
// calculate the unpremultiplied alpha, applying the general equation:
// alpha = alpha_overlay / ( (alpha_main + alpha_overlay) - (alpha_main * alpha_overlay) )
// (((x) << 16) - ((x) << 9) + (x)) is a faster version of: 255 * 255 * x
// ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)) is a faster version of: 255 * (x + y)
#define UNPREMULTIPLY_ALPHA(x, y) ((((x) << 16) - ((x) << 9) + (x)) / ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)))
/**
* Blend image in src to destination buffer dst at position (x, y).
*/
static av_always_inline void blend_slice_packed_rgb(AVFilterContext *ctx,
AVFrame *dst, const AVFrame *src,
int main_has_alpha, int x, int y,
int is_straight, int jobnr, int nb_jobs)
{
OverlayContext *s = ctx->priv;
int i, imax, j, jmax;
const int src_w = src->width;
const int src_h = src->height;
const int dst_w = dst->width;
const int dst_h = dst->height;
uint8_t alpha; ///< the amount of overlay to blend on to main
const int dr = s->main_rgba_map[R];
const int dg = s->main_rgba_map[G];
const int db = s->main_rgba_map[B];
const int da = s->main_rgba_map[A];
const int dstep = s->main_pix_step[0];
const int sr = s->overlay_rgba_map[R];
const int sg = s->overlay_rgba_map[G];
const int sb = s->overlay_rgba_map[B];
const int sa = s->overlay_rgba_map[A];
const int sstep = s->overlay_pix_step[0];
int slice_start, slice_end;
uint8_t *S, *sp, *d, *dp;
i = FFMAX(-y, 0);
imax = FFMIN3(-y + dst_h, FFMIN(src_h, dst_h), y + src_h);
slice_start = i + (imax * jobnr) / nb_jobs;
slice_end = i + (imax * (jobnr+1)) / nb_jobs;
sp = src->data[0] + (slice_start) * src->linesize[0];
dp = dst->data[0] + (y + slice_start) * dst->linesize[0];
for (i = slice_start; i < slice_end; i++) {
j = FFMAX(-x, 0);
S = sp + j * sstep;
d = dp + (x+j) * dstep;
for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) {
alpha = S[sa];
// if the main channel has an alpha channel, alpha has to be calculated
// to create an un-premultiplied (straight) alpha value
if (main_has_alpha && alpha != 0 && alpha != 255) {
uint8_t alpha_d = d[da];
alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
}
switch (alpha) {
case 0:
break;
case 255:
d[dr] = S[sr];
d[dg] = S[sg];
d[db] = S[sb];
break;
default:
// main_value = main_value * (1 - alpha) + overlay_value * alpha
// since alpha is in the range 0-255, the result must divided by 255
d[dr] = is_straight ? FAST_DIV255(d[dr] * (255 - alpha) + S[sr] * alpha) :
FFMIN(FAST_DIV255(d[dr] * (255 - alpha)) + S[sr], 255);
d[dg] = is_straight ? FAST_DIV255(d[dg] * (255 - alpha) + S[sg] * alpha) :
FFMIN(FAST_DIV255(d[dg] * (255 - alpha)) + S[sg], 255);
d[db] = is_straight ? FAST_DIV255(d[db] * (255 - alpha) + S[sb] * alpha) :
FFMIN(FAST_DIV255(d[db] * (255 - alpha)) + S[sb], 255);
}
if (main_has_alpha) {
switch (alpha) {
case 0:
break;
case 255:
d[da] = S[sa];
break;
default:
// apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha
d[da] += FAST_DIV255((255 - d[da]) * S[sa]);
}
}
d += dstep;
S += sstep;
}
dp += dst->linesize[0];
sp += src->linesize[0];
}
}
#define DEFINE_BLEND_PLANE(depth, nbits) \
static av_always_inline void blend_plane_##depth##_##nbits##bits(AVFilterContext *ctx, \
AVFrame *dst, const AVFrame *src, \
int src_w, int src_h, \
int dst_w, int dst_h, \
int i, int hsub, int vsub, \
int x, int y, \
int main_has_alpha, \
int dst_plane, \
int dst_offset, \
int dst_step, \
int straight, \
int yuv, \
int jobnr, \
int nb_jobs) \
{ \
OverlayContext *octx = ctx->priv; \
int src_wp = AV_CEIL_RSHIFT(src_w, hsub); \
int src_hp = AV_CEIL_RSHIFT(src_h, vsub); \
int dst_wp = AV_CEIL_RSHIFT(dst_w, hsub); \
int dst_hp = AV_CEIL_RSHIFT(dst_h, vsub); \
int yp = y>>vsub; \
int xp = x>>hsub; \
uint##depth##_t *s, *sp, *d, *dp, *dap, *a, *da, *ap; \
int jmax, j, k, kmax; \
int slice_start, slice_end; \
const uint##depth##_t max = (1 << nbits) - 1; \
const uint##depth##_t mid = (1 << (nbits -1)) ; \
int bytes = depth / 8; \
\
dst_step /= bytes; \
j = FFMAX(-yp, 0); \
jmax = FFMIN3(-yp + dst_hp, FFMIN(src_hp, dst_hp), yp + src_hp); \
\
slice_start = j + (jmax * jobnr) / nb_jobs; \
slice_end = j + (jmax * (jobnr+1)) / nb_jobs; \
\
sp = (uint##depth##_t *)(src->data[i] + (slice_start) * src->linesize[i]); \
dp = (uint##depth##_t *)(dst->data[dst_plane] \
+ (yp + slice_start) * dst->linesize[dst_plane] \
+ dst_offset); \
ap = (uint##depth##_t *)(src->data[3] + (slice_start << vsub) * src->linesize[3]); \
dap = (uint##depth##_t *)(dst->data[3] + ((yp + slice_start) << vsub) * dst->linesize[3]); \
\
for (j = slice_start; j < slice_end; j++) { \
k = FFMAX(-xp, 0); \
d = dp + (xp+k) * dst_step; \
s = sp + k; \
a = ap + (k<<hsub); \
da = dap + ((xp+k) << hsub); \
kmax = FFMIN(-xp + dst_wp, src_wp); \
\
if (nbits == 8 && ((vsub && j+1 < src_hp) || !vsub) && octx->blend_row[i]) { \
int c = octx->blend_row[i]((uint8_t*)d, (uint8_t*)da, (uint8_t*)s, \
(uint8_t*)a, kmax - k, src->linesize[3]); \
\
s += c; \
d += dst_step * c; \
da += (1 << hsub) * c; \
a += (1 << hsub) * c; \
k += c; \
} \
for (; k < kmax; k++) { \
int alpha_v, alpha_h, alpha; \
\
/* average alpha for color components, improve quality */ \
if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) { \
alpha = (a[0] + a[src->linesize[3]] + \
a[1] + a[src->linesize[3]+1]) >> 2; \
} else if (hsub || vsub) { \
alpha_h = hsub && k+1 < src_wp ? \
(a[0] + a[1]) >> 1 : a[0]; \
alpha_v = vsub && j+1 < src_hp ? \
(a[0] + a[src->linesize[3]]) >> 1 : a[0]; \
alpha = (alpha_v + alpha_h) >> 1; \
} else \
alpha = a[0]; \
/* if the main channel has an alpha channel, alpha has to be calculated */ \
/* to create an un-premultiplied (straight) alpha value */ \
if (main_has_alpha && alpha != 0 && alpha != max) { \
/* average alpha for color components, improve quality */ \
uint8_t alpha_d; \
if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) { \
alpha_d = (da[0] + da[dst->linesize[3]] + \
da[1] + da[dst->linesize[3]+1]) >> 2; \
} else if (hsub || vsub) { \
alpha_h = hsub && k+1 < src_wp ? \
(da[0] + da[1]) >> 1 : da[0]; \
alpha_v = vsub && j+1 < src_hp ? \
(da[0] + da[dst->linesize[3]]) >> 1 : da[0]; \
alpha_d = (alpha_v + alpha_h) >> 1; \
} else \
alpha_d = da[0]; \
alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d); \
} \
if (straight) { \
if (nbits > 8) \
*d = (*d * (max - alpha) + *s * alpha) / max; \
else \
*d = FAST_DIV255(*d * (255 - alpha) + *s * alpha); \
} else { \
if (nbits > 8) { \
if (i && yuv) \
*d = av_clip((*d * (max - alpha) + *s * alpha) / max + *s - mid, -mid, mid) + mid; \
else \
*d = FFMIN((*d * (max - alpha) + *s * alpha) / max + *s, max); \
} else { \
if (i && yuv) \
*d = av_clip(FAST_DIV255((*d - mid) * (max - alpha)) + *s - mid, -mid, mid) + mid; \
else \
*d = FFMIN(FAST_DIV255(*d * (max - alpha)) + *s, max); \
} \
} \
s++; \
d += dst_step; \
da += 1 << hsub; \
a += 1 << hsub; \
} \
dp += dst->linesize[dst_plane] / bytes; \
sp += src->linesize[i] / bytes; \
ap += (1 << vsub) * src->linesize[3] / bytes; \
dap += (1 << vsub) * dst->linesize[3] / bytes; \
} \
}
DEFINE_BLEND_PLANE(8, 8)
DEFINE_BLEND_PLANE(16, 10)
#define DEFINE_ALPHA_COMPOSITE(depth, nbits) \
static inline void alpha_composite_##depth##_##nbits##bits(const AVFrame *src, const AVFrame *dst, \
int src_w, int src_h, \
int dst_w, int dst_h, \
int x, int y, \
int jobnr, int nb_jobs) \
{ \
uint##depth##_t alpha; /* the amount of overlay to blend on to main */ \
uint##depth##_t *s, *sa, *d, *da; \
int i, imax, j, jmax; \
int slice_start, slice_end; \
const uint##depth##_t max = (1 << nbits) - 1; \
int bytes = depth / 8; \
\
imax = FFMIN(-y + dst_h, src_h); \
slice_start = (imax * jobnr) / nb_jobs; \
slice_end = ((imax * (jobnr+1)) / nb_jobs); \
\
i = FFMAX(-y, 0); \
sa = (uint##depth##_t *)(src->data[3] + (i + slice_start) * src->linesize[3]); \
da = (uint##depth##_t *)(dst->data[3] + (y + i + slice_start) * dst->linesize[3]); \
\
for (i = i + slice_start; i < slice_end; i++) { \
j = FFMAX(-x, 0); \
s = sa + j; \
d = da + x+j; \
\
for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) { \
alpha = *s; \
if (alpha != 0 && alpha != max) { \
uint8_t alpha_d = *d; \
alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d); \
} \
if (alpha == max) \
*d = *s; \
else if (alpha > 0) { \
/* apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha */ \
if (nbits > 8) \
*d += (max - *d) * *s / max; \
else \
*d += FAST_DIV255((max - *d) * *s); \
} \
d += 1; \
s += 1; \
} \
da += dst->linesize[3] / bytes; \
sa += src->linesize[3] / bytes; \
} \
}
DEFINE_ALPHA_COMPOSITE(8, 8)
DEFINE_ALPHA_COMPOSITE(16, 10)
#define DEFINE_BLEND_SLICE_YUV(depth, nbits) \
static av_always_inline void blend_slice_yuv_##depth##_##nbits##bits(AVFilterContext *ctx, \
AVFrame *dst, const AVFrame *src, \
int hsub, int vsub, \
int main_has_alpha, \
int x, int y, \
int is_straight, \
int jobnr, int nb_jobs) \
{ \
OverlayContext *s = ctx->priv; \
const int src_w = src->width; \
const int src_h = src->height; \
const int dst_w = dst->width; \
const int dst_h = dst->height; \
\
blend_plane_##depth##_##nbits##bits(ctx, dst, src, src_w, src_h, dst_w, dst_h, 0, 0, 0, \
x, y, main_has_alpha, s->main_desc->comp[0].plane, s->main_desc->comp[0].offset, \
s->main_desc->comp[0].step, is_straight, 1, jobnr, nb_jobs); \
blend_plane_##depth##_##nbits##bits(ctx, dst, src, src_w, src_h, dst_w, dst_h, 1, hsub, vsub, \
x, y, main_has_alpha, s->main_desc->comp[1].plane, s->main_desc->comp[1].offset, \
s->main_desc->comp[1].step, is_straight, 1, jobnr, nb_jobs); \
blend_plane_##depth##_##nbits##bits(ctx, dst, src, src_w, src_h, dst_w, dst_h, 2, hsub, vsub, \
x, y, main_has_alpha, s->main_desc->comp[2].plane, s->main_desc->comp[2].offset, \
s->main_desc->comp[2].step, is_straight, 1, jobnr, nb_jobs); \
\
if (main_has_alpha) \
alpha_composite_##depth##_##nbits##bits(src, dst, src_w, src_h, dst_w, dst_h, x, y, \
jobnr, nb_jobs); \
}
DEFINE_BLEND_SLICE_YUV(8, 8)
DEFINE_BLEND_SLICE_YUV(16, 10)
static av_always_inline void blend_slice_planar_rgb(AVFilterContext *ctx,
AVFrame *dst, const AVFrame *src,
int hsub, int vsub,
int main_has_alpha,
int x, int y,
int is_straight,
int jobnr,
int nb_jobs)
{
OverlayContext *s = ctx->priv;
const int src_w = src->width;
const int src_h = src->height;
const int dst_w = dst->width;
const int dst_h = dst->height;
blend_plane_8_8bits(ctx, dst, src, src_w, src_h, dst_w, dst_h, 0, 0, 0, x, y, main_has_alpha,
s->main_desc->comp[1].plane, s->main_desc->comp[1].offset, s->main_desc->comp[1].step, is_straight, 0,
jobnr, nb_jobs);
blend_plane_8_8bits(ctx, dst, src, src_w, src_h, dst_w, dst_h, 1, hsub, vsub, x, y, main_has_alpha,
s->main_desc->comp[2].plane, s->main_desc->comp[2].offset, s->main_desc->comp[2].step, is_straight, 0,
jobnr, nb_jobs);
blend_plane_8_8bits(ctx, dst, src, src_w, src_h, dst_w, dst_h, 2, hsub, vsub, x, y, main_has_alpha,
s->main_desc->comp[0].plane, s->main_desc->comp[0].offset, s->main_desc->comp[0].step, is_straight, 0,
jobnr, nb_jobs);
if (main_has_alpha)
alpha_composite_8_8bits(src, dst, src_w, src_h, dst_w, dst_h, x, y, jobnr, nb_jobs);
}
static int blend_slice_yuv420(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
OverlayContext *s = ctx->priv;
ThreadData *td = arg;
blend_slice_yuv_8_8bits(ctx, td->dst, td->src, 1, 1, 0, s->x, s->y, 1, jobnr, nb_jobs);
return 0;
}
static int blend_slice_yuva420(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
OverlayContext *s = ctx->priv;
ThreadData *td = arg;
blend_slice_yuv_8_8bits(ctx, td->dst, td->src, 1, 1, 1, s->x, s->y, 1, jobnr, nb_jobs);
return 0;
}
static int blend_slice_yuv420p10(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
OverlayContext *s = ctx->priv;
ThreadData *td = arg;
blend_slice_yuv_16_10bits(ctx, td->dst, td->src, 1, 1, 0, s->x, s->y, 1, jobnr, nb_jobs);
return 0;
}
static int blend_slice_yuva420p10(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
OverlayContext *s = ctx->priv;
ThreadData *td = arg;
blend_slice_yuv_16_10bits(ctx, td->dst, td->src, 1, 1, 1, s->x, s->y, 1, jobnr, nb_jobs);
return 0;
}
static int blend_slice_yuv422p10(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
OverlayContext *s = ctx->priv;
ThreadData *td = arg;
blend_slice_yuv_16_10bits(ctx, td->dst, td->src, 1, 0, 0, s->x, s->y, 1, jobnr, nb_jobs);
return 0;
}
static int blend_slice_yuva422p10(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
OverlayContext *s = ctx->priv;
ThreadData *td = arg;
blend_slice_yuv_16_10bits(ctx, td->dst, td->src, 1, 0, 1, s->x, s->y, 1, jobnr, nb_jobs);
return 0;
}
static int blend_slice_yuv422(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
OverlayContext *s = ctx->priv;
ThreadData *td = arg;
blend_slice_yuv_8_8bits(ctx, td->dst, td->src, 1, 0, 0, s->x, s->y, 1, jobnr, nb_jobs);
return 0;
}
static int blend_slice_yuva422(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
OverlayContext *s = ctx->priv;
ThreadData *td = arg;
blend_slice_yuv_8_8bits(ctx, td->dst, td->src, 1, 0, 1, s->x, s->y, 1, jobnr, nb_jobs);
return 0;
}
static int blend_slice_yuv444(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
OverlayContext *s = ctx->priv;
ThreadData *td = arg;
blend_slice_yuv_8_8bits(ctx, td->dst, td->src, 0, 0, 0, s->x, s->y, 1, jobnr, nb_jobs);
return 0;
}
static int blend_slice_yuva444(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
OverlayContext *s = ctx->priv;
ThreadData *td = arg;
blend_slice_yuv_8_8bits(ctx, td->dst, td->src, 0, 0, 1, s->x, s->y, 1, jobnr, nb_jobs);
return 0;
}
static int blend_slice_gbrp(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
OverlayContext *s = ctx->priv;
ThreadData *td = arg;
blend_slice_planar_rgb(ctx, td->dst, td->src, 0, 0, 0, s->x, s->y, 1, jobnr, nb_jobs);
return 0;
}
static int blend_slice_gbrap(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
OverlayContext *s = ctx->priv;
ThreadData *td = arg;
blend_slice_planar_rgb(ctx, td->dst, td->src, 0, 0, 1, s->x, s->y, 1, jobnr, nb_jobs);
return 0;
}
static int blend_slice_yuv420_pm(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
OverlayContext *s = ctx->priv;
ThreadData *td = arg;
blend_slice_yuv_8_8bits(ctx, td->dst, td->src, 1, 1, 0, s->x, s->y, 0, jobnr, nb_jobs);
return 0;
}
static int blend_slice_yuva420_pm(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
OverlayContext *s = ctx->priv;
ThreadData *td = arg;
blend_slice_yuv_8_8bits(ctx, td->dst, td->src, 1, 1, 1, s->x, s->y, 0, jobnr, nb_jobs);
return 0;
}
static int blend_slice_yuv422_pm(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
OverlayContext *s = ctx->priv;
ThreadData *td = arg;
blend_slice_yuv_8_8bits(ctx, td->dst, td->src, 1, 0, 0, s->x, s->y, 0, jobnr, nb_jobs);
return 0;
}
static int blend_slice_yuva422_pm(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
OverlayContext *s = ctx->priv;
ThreadData *td = arg;
blend_slice_yuv_8_8bits(ctx, td->dst, td->src, 1, 0, 1, s->x, s->y, 0, jobnr, nb_jobs);
return 0;
}
static int blend_slice_yuv444_pm(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
OverlayContext *s = ctx->priv;
ThreadData *td = arg;
blend_slice_yuv_8_8bits(ctx, td->dst, td->src, 0, 0, 0, s->x, s->y, 0, jobnr, nb_jobs);
return 0;
}
static int blend_slice_yuva444_pm(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
OverlayContext *s = ctx->priv;
ThreadData *td = arg;
blend_slice_yuv_8_8bits(ctx, td->dst, td->src, 0, 0, 1, s->x, s->y, 0, jobnr, nb_jobs);
return 0;
}
static int blend_slice_gbrp_pm(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
OverlayContext *s = ctx->priv;
ThreadData *td = arg;
blend_slice_planar_rgb(ctx, td->dst, td->src, 0, 0, 0, s->x, s->y, 0, jobnr, nb_jobs);
return 0;
}
static int blend_slice_gbrap_pm(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
OverlayContext *s = ctx->priv;
ThreadData *td = arg;
blend_slice_planar_rgb(ctx, td->dst, td->src, 0, 0, 1, s->x, s->y, 0, jobnr, nb_jobs);
return 0;
}
static int blend_slice_rgb(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
OverlayContext *s = ctx->priv;
ThreadData *td = arg;
blend_slice_packed_rgb(ctx, td->dst, td->src, 0, s->x, s->y, 1, jobnr, nb_jobs);
return 0;
}
static int blend_slice_rgba(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
OverlayContext *s = ctx->priv;
ThreadData *td = arg;
blend_slice_packed_rgb(ctx, td->dst, td->src, 1, s->x, s->y, 1, jobnr, nb_jobs);
return 0;
}
static int blend_slice_rgb_pm(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
OverlayContext *s = ctx->priv;
ThreadData *td = arg;
blend_slice_packed_rgb(ctx, td->dst, td->src, 0, s->x, s->y, 0, jobnr, nb_jobs);
return 0;
}
static int blend_slice_rgba_pm(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
OverlayContext *s = ctx->priv;
ThreadData *td = arg;
blend_slice_packed_rgb(ctx, td->dst, td->src, 1, s->x, s->y, 0, jobnr, nb_jobs);
return 0;
}
static int config_input_main(AVFilterLink *inlink)
{
OverlayContext *s = inlink->dst->priv;
const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
av_image_fill_max_pixsteps(s->main_pix_step, NULL, pix_desc);
s->hsub = pix_desc->log2_chroma_w;
s->vsub = pix_desc->log2_chroma_h;
s->main_desc = pix_desc;
s->main_is_packed_rgb =
ff_fill_rgba_map(s->main_rgba_map, inlink->format) >= 0;
s->main_has_alpha = ff_fmt_is_in(inlink->format, alpha_pix_fmts);
switch (s->format) {
case OVERLAY_FORMAT_YUV420:
s->blend_slice = s->main_has_alpha ? blend_slice_yuva420 : blend_slice_yuv420;
break;
case OVERLAY_FORMAT_YUV420P10:
s->blend_slice = s->main_has_alpha ? blend_slice_yuva420p10 : blend_slice_yuv420p10;
break;
case OVERLAY_FORMAT_YUV422:
s->blend_slice = s->main_has_alpha ? blend_slice_yuva422 : blend_slice_yuv422;
break;
case OVERLAY_FORMAT_YUV422P10:
s->blend_slice = s->main_has_alpha ? blend_slice_yuva422p10 : blend_slice_yuv422p10;
break;
case OVERLAY_FORMAT_YUV444:
s->blend_slice = s->main_has_alpha ? blend_slice_yuva444 : blend_slice_yuv444;
break;
case OVERLAY_FORMAT_RGB:
s->blend_slice = s->main_has_alpha ? blend_slice_rgba : blend_slice_rgb;
break;
case OVERLAY_FORMAT_GBRP:
s->blend_slice = s->main_has_alpha ? blend_slice_gbrap : blend_slice_gbrp;
break;
case OVERLAY_FORMAT_AUTO:
switch (inlink->format) {
case AV_PIX_FMT_YUVA420P:
s->blend_slice = blend_slice_yuva420;
break;
case AV_PIX_FMT_YUVA420P10:
s->blend_slice = blend_slice_yuva420p10;
break;
case AV_PIX_FMT_YUVA422P:
s->blend_slice = blend_slice_yuva422;
break;
case AV_PIX_FMT_YUVA422P10:
s->blend_slice = blend_slice_yuva422p10;
break;
case AV_PIX_FMT_YUVA444P:
s->blend_slice = blend_slice_yuva444;
break;
case AV_PIX_FMT_ARGB:
case AV_PIX_FMT_RGBA:
case AV_PIX_FMT_BGRA:
case AV_PIX_FMT_ABGR:
s->blend_slice = blend_slice_rgba;
break;
case AV_PIX_FMT_GBRAP:
s->blend_slice = blend_slice_gbrap;
break;
default:
av_assert0(0);
break;
}
break;
}
if (!s->alpha_format)
goto end;
switch (s->format) {
case OVERLAY_FORMAT_YUV420:
s->blend_slice = s->main_has_alpha ? blend_slice_yuva420_pm : blend_slice_yuv420_pm;
break;
case OVERLAY_FORMAT_YUV422:
s->blend_slice = s->main_has_alpha ? blend_slice_yuva422_pm : blend_slice_yuv422_pm;
break;
case OVERLAY_FORMAT_YUV444:
s->blend_slice = s->main_has_alpha ? blend_slice_yuva444_pm : blend_slice_yuv444_pm;
break;
case OVERLAY_FORMAT_RGB:
s->blend_slice = s->main_has_alpha ? blend_slice_rgba_pm : blend_slice_rgb_pm;
break;
case OVERLAY_FORMAT_GBRP:
s->blend_slice = s->main_has_alpha ? blend_slice_gbrap_pm : blend_slice_gbrp_pm;
break;
case OVERLAY_FORMAT_AUTO:
switch (inlink->format) {
case AV_PIX_FMT_YUVA420P:
s->blend_slice = blend_slice_yuva420_pm;
break;
case AV_PIX_FMT_YUVA422P:
s->blend_slice = blend_slice_yuva422_pm;
break;
case AV_PIX_FMT_YUVA444P:
s->blend_slice = blend_slice_yuva444_pm;
break;
case AV_PIX_FMT_ARGB:
case AV_PIX_FMT_RGBA:
case AV_PIX_FMT_BGRA:
case AV_PIX_FMT_ABGR:
s->blend_slice = blend_slice_rgba_pm;
break;
case AV_PIX_FMT_GBRAP:
s->blend_slice = blend_slice_gbrap_pm;
break;
default:
av_assert0(0);
break;
}
break;
}
end:
if (ARCH_X86)
ff_overlay_init_x86(s, s->format, inlink->format,
s->alpha_format, s->main_has_alpha);
return 0;
}
static int do_blend(FFFrameSync *fs)
{
AVFilterContext *ctx = fs->parent;
AVFrame *mainpic, *second;
OverlayContext *s = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
int ret;
ret = ff_framesync_dualinput_get_writable(fs, &mainpic, &second);
if (ret < 0)
return ret;
if (!second)
return ff_filter_frame(ctx->outputs[0], mainpic);
if (s->eval_mode == EVAL_MODE_FRAME) {
int64_t pos = mainpic->pkt_pos;
s->var_values[VAR_N] = inlink->frame_count_out;
s->var_values[VAR_T] = mainpic->pts == AV_NOPTS_VALUE ?
NAN : mainpic->pts * av_q2d(inlink->time_base);
s->var_values[VAR_POS] = pos == -1 ? NAN : pos;
s->var_values[VAR_OVERLAY_W] = s->var_values[VAR_OW] = second->width;
s->var_values[VAR_OVERLAY_H] = s->var_values[VAR_OH] = second->height;
s->var_values[VAR_MAIN_W ] = s->var_values[VAR_MW] = mainpic->width;
s->var_values[VAR_MAIN_H ] = s->var_values[VAR_MH] = mainpic->height;
eval_expr(ctx);
av_log(ctx, AV_LOG_DEBUG, "n:%f t:%f pos:%f x:%f xi:%d y:%f yi:%d\n",
s->var_values[VAR_N], s->var_values[VAR_T], s->var_values[VAR_POS],
s->var_values[VAR_X], s->x,
s->var_values[VAR_Y], s->y);
}
if (s->x < mainpic->width && s->x + second->width >= 0 &&
s->y < mainpic->height && s->y + second->height >= 0) {
ThreadData td;
td.dst = mainpic;
td.src = second;
ctx->internal->execute(ctx, s->blend_slice, &td, NULL, FFMIN(FFMAX(1, FFMIN3(s->y + second->height, FFMIN(second->height, mainpic->height), mainpic->height - s->y)),
ff_filter_get_nb_threads(ctx)));
}
return ff_filter_frame(ctx->outputs[0], mainpic);
}
static av_cold int init(AVFilterContext *ctx)
{
OverlayContext *s = ctx->priv;
s->fs.on_event = do_blend;
return 0;
}
static int activate(AVFilterContext *ctx)
{
OverlayContext *s = ctx->priv;
return ff_framesync_activate(&s->fs);
}
#define OFFSET(x) offsetof(OverlayContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption overlay_options[] = {
{ "x", "set the x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, 0, 0, FLAGS },
{ "y", "set the y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, 0, 0, FLAGS },
{ "eof_action", "Action to take when encountering EOF from secondary input ",
OFFSET(fs.opt_eof_action), AV_OPT_TYPE_INT, { .i64 = EOF_ACTION_REPEAT },
EOF_ACTION_REPEAT, EOF_ACTION_PASS, .flags = FLAGS, "eof_action" },
{ "repeat", "Repeat the previous frame.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_REPEAT }, .flags = FLAGS, "eof_action" },
{ "endall", "End both streams.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_ENDALL }, .flags = FLAGS, "eof_action" },
{ "pass", "Pass through the main input.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_PASS }, .flags = FLAGS, "eof_action" },
{ "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_FRAME}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
{ "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
{ "frame", "eval expressions per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
{ "shortest", "force termination when the shortest input terminates", OFFSET(fs.opt_shortest), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
{ "format", "set output format", OFFSET(format), AV_OPT_TYPE_INT, {.i64=OVERLAY_FORMAT_YUV420}, 0, OVERLAY_FORMAT_NB-1, FLAGS, "format" },
{ "yuv420", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV420}, .flags = FLAGS, .unit = "format" },
{ "yuv420p10", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV420P10}, .flags = FLAGS, .unit = "format" },
{ "yuv422", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV422}, .flags = FLAGS, .unit = "format" },
{ "yuv422p10", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV422P10}, .flags = FLAGS, .unit = "format" },
{ "yuv444", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV444}, .flags = FLAGS, .unit = "format" },
{ "rgb", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_RGB}, .flags = FLAGS, .unit = "format" },
{ "gbrp", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_GBRP}, .flags = FLAGS, .unit = "format" },
{ "auto", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_AUTO}, .flags = FLAGS, .unit = "format" },
{ "repeatlast", "repeat overlay of the last overlay frame", OFFSET(fs.opt_repeatlast), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
{ "alpha", "alpha format", OFFSET(alpha_format), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "alpha_format" },
{ "straight", "", 0, AV_OPT_TYPE_CONST, {.i64=0}, .flags = FLAGS, .unit = "alpha_format" },
{ "premultiplied", "", 0, AV_OPT_TYPE_CONST, {.i64=1}, .flags = FLAGS, .unit = "alpha_format" },
{ NULL }
};
FRAMESYNC_DEFINE_CLASS(overlay, OverlayContext, fs);
static const AVFilterPad avfilter_vf_overlay_inputs[] = {
{
.name = "main",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input_main,
},
{
.name = "overlay",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input_overlay,
},
{ NULL }
};
static const AVFilterPad avfilter_vf_overlay_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
{ NULL }
};
AVFilter ff_vf_overlay = {
.name = "overlay",
.description = NULL_IF_CONFIG_SMALL("Overlay a video source on top of the input."),
.preinit = overlay_framesync_preinit,
.init = init,
.uninit = uninit,
.priv_size = sizeof(OverlayContext),
.priv_class = &overlay_class,
.query_formats = query_formats,
.activate = activate,
.process_command = process_command,
.inputs = avfilter_vf_overlay_inputs,
.outputs = avfilter_vf_overlay_outputs,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL |
AVFILTER_FLAG_SLICE_THREADS,
};
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