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FFmpeg/libavfilter/vf_blend.c
Paul B Mahol d64cbd4fda remove CHAR_MIN/CHAR_MAX usage 
It is not needed at all.
2020-03-17 22:46:36 +01:00

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/*
* Copyright (c) 2013 Paul B Mahol
*
* 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
*/
#include "libavutil/imgutils.h"
#include "libavutil/eval.h"
#include "libavutil/opt.h"
#include "libavutil/pixfmt.h"
#include "avfilter.h"
#include "formats.h"
#include "framesync.h"
#include "internal.h"
#include "video.h"
#include "blend.h"
#define TOP 0
#define BOTTOM 1
typedef struct BlendContext {
const AVClass *class;
FFFrameSync fs;
int hsub, vsub; ///< chroma subsampling values
int nb_planes;
char *all_expr;
enum BlendMode all_mode;
double all_opacity;
int depth;
FilterParams params[4];
int tblend;
AVFrame *prev_frame; /* only used with tblend */
} BlendContext;
static const char *const var_names[] = { "X", "Y", "W", "H", "SW", "SH", "T", "N", "A", "B", "TOP", "BOTTOM", NULL };
enum { VAR_X, VAR_Y, VAR_W, VAR_H, VAR_SW, VAR_SH, VAR_T, VAR_N, VAR_A, VAR_B, VAR_TOP, VAR_BOTTOM, VAR_VARS_NB };
typedef struct ThreadData {
const AVFrame *top, *bottom;
AVFrame *dst;
AVFilterLink *inlink;
int plane;
int w, h;
FilterParams *param;
} ThreadData;
#define COMMON_OPTIONS \
{ "c0_mode", "set component #0 blend mode", OFFSET(params[0].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"},\
{ "c1_mode", "set component #1 blend mode", OFFSET(params[1].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"},\
{ "c2_mode", "set component #2 blend mode", OFFSET(params[2].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"},\
{ "c3_mode", "set component #3 blend mode", OFFSET(params[3].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"},\
{ "all_mode", "set blend mode for all components", OFFSET(all_mode), AV_OPT_TYPE_INT, {.i64=-1},-1, BLEND_NB-1, FLAGS, "mode"},\
{ "addition", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_ADDITION}, 0, 0, FLAGS, "mode" },\
{ "addition128","", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_GRAINMERGE}, 0, 0, FLAGS, "mode" },\
{ "grainmerge", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_GRAINMERGE}, 0, 0, FLAGS, "mode" },\
{ "and", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_AND}, 0, 0, FLAGS, "mode" },\
{ "average", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_AVERAGE}, 0, 0, FLAGS, "mode" },\
{ "burn", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_BURN}, 0, 0, FLAGS, "mode" },\
{ "darken", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DARKEN}, 0, 0, FLAGS, "mode" },\
{ "difference", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DIFFERENCE}, 0, 0, FLAGS, "mode" },\
{ "difference128", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_GRAINEXTRACT}, 0, 0, FLAGS, "mode" },\
{ "grainextract", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_GRAINEXTRACT}, 0, 0, FLAGS, "mode" },\
{ "divide", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DIVIDE}, 0, 0, FLAGS, "mode" },\
{ "dodge", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DODGE}, 0, 0, FLAGS, "mode" },\
{ "exclusion", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_EXCLUSION}, 0, 0, FLAGS, "mode" },\
{ "extremity", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_EXTREMITY}, 0, 0, FLAGS, "mode" },\
{ "freeze", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_FREEZE}, 0, 0, FLAGS, "mode" },\
{ "glow", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_GLOW}, 0, 0, FLAGS, "mode" },\
{ "hardlight", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_HARDLIGHT}, 0, 0, FLAGS, "mode" },\
{ "hardmix", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_HARDMIX}, 0, 0, FLAGS, "mode" },\
{ "heat", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_HEAT}, 0, 0, FLAGS, "mode" },\
{ "lighten", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_LIGHTEN}, 0, 0, FLAGS, "mode" },\
{ "linearlight","", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_LINEARLIGHT},0, 0, FLAGS, "mode" },\
{ "multiply", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_MULTIPLY}, 0, 0, FLAGS, "mode" },\
{ "multiply128","", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_MULTIPLY128},0, 0, FLAGS, "mode" },\
{ "negation", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_NEGATION}, 0, 0, FLAGS, "mode" },\
{ "normal", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_NORMAL}, 0, 0, FLAGS, "mode" },\
{ "or", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_OR}, 0, 0, FLAGS, "mode" },\
{ "overlay", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_OVERLAY}, 0, 0, FLAGS, "mode" },\
{ "phoenix", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_PHOENIX}, 0, 0, FLAGS, "mode" },\
{ "pinlight", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_PINLIGHT}, 0, 0, FLAGS, "mode" },\
{ "reflect", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_REFLECT}, 0, 0, FLAGS, "mode" },\
{ "screen", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_SCREEN}, 0, 0, FLAGS, "mode" },\
{ "softlight", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_SOFTLIGHT}, 0, 0, FLAGS, "mode" },\
{ "subtract", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_SUBTRACT}, 0, 0, FLAGS, "mode" },\
{ "vividlight", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_VIVIDLIGHT}, 0, 0, FLAGS, "mode" },\
{ "xor", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_XOR}, 0, 0, FLAGS, "mode" },\
{ "c0_expr", "set color component #0 expression", OFFSET(params[0].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },\
{ "c1_expr", "set color component #1 expression", OFFSET(params[1].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },\
{ "c2_expr", "set color component #2 expression", OFFSET(params[2].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },\
{ "c3_expr", "set color component #3 expression", OFFSET(params[3].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },\
{ "all_expr", "set expression for all color components", OFFSET(all_expr), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },\
{ "c0_opacity", "set color component #0 opacity", OFFSET(params[0].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },\
{ "c1_opacity", "set color component #1 opacity", OFFSET(params[1].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },\
{ "c2_opacity", "set color component #2 opacity", OFFSET(params[2].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },\
{ "c3_opacity", "set color component #3 opacity", OFFSET(params[3].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },\
{ "all_opacity", "set opacity for all color components", OFFSET(all_opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS}
#define OFFSET(x) offsetof(BlendContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption blend_options[] = {
COMMON_OPTIONS,
{ NULL }
};
FRAMESYNC_DEFINE_CLASS(blend, BlendContext, fs);
#define COPY(src, depth) \
static void blend_copy ## src##_##depth(const uint8_t *top, ptrdiff_t top_linesize, \
const uint8_t *bottom, ptrdiff_t bottom_linesize,\
uint8_t *dst, ptrdiff_t dst_linesize, \
ptrdiff_t width, ptrdiff_t height, \
FilterParams *param, double *values, int starty) \
{ \
av_image_copy_plane(dst, dst_linesize, src, src ## _linesize, \
width * depth / 8, height); \
}
COPY(top, 8)
COPY(bottom, 8)
COPY(top, 16)
COPY(bottom, 16)
#undef COPY
static void blend_normal_8bit(const uint8_t *top, ptrdiff_t top_linesize,
const uint8_t *bottom, ptrdiff_t bottom_linesize,
uint8_t *dst, ptrdiff_t dst_linesize,
ptrdiff_t width, ptrdiff_t height,
FilterParams *param, double *values, int starty)
{
const double opacity = param->opacity;
int i, j;
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
dst[j] = top[j] * opacity + bottom[j] * (1. - opacity);
}
dst += dst_linesize;
top += top_linesize;
bottom += bottom_linesize;
}
}
static void blend_normal_16bit(const uint8_t *_top, ptrdiff_t top_linesize,
const uint8_t *_bottom, ptrdiff_t bottom_linesize,
uint8_t *_dst, ptrdiff_t dst_linesize,
ptrdiff_t width, ptrdiff_t height,
FilterParams *param, double *values, int starty)
{
const uint16_t *top = (uint16_t*)_top;
const uint16_t *bottom = (uint16_t*)_bottom;
uint16_t *dst = (uint16_t*)_dst;
const double opacity = param->opacity;
int i, j;
dst_linesize /= 2;
top_linesize /= 2;
bottom_linesize /= 2;
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
dst[j] = top[j] * opacity + bottom[j] * (1. - opacity);
}
dst += dst_linesize;
top += top_linesize;
bottom += bottom_linesize;
}
}
#define DEFINE_BLEND8(name, expr) \
static void blend_## name##_8bit(const uint8_t *top, ptrdiff_t top_linesize, \
const uint8_t *bottom, ptrdiff_t bottom_linesize, \
uint8_t *dst, ptrdiff_t dst_linesize, \
ptrdiff_t width, ptrdiff_t height, \
FilterParams *param, double *values, int starty) \
{ \
double opacity = param->opacity; \
int i, j; \
\
for (i = 0; i < height; i++) { \
for (j = 0; j < width; j++) { \
dst[j] = top[j] + ((expr) - top[j]) * opacity; \
} \
dst += dst_linesize; \
top += top_linesize; \
bottom += bottom_linesize; \
} \
}
#define DEFINE_BLEND16(name, expr, depth) \
static void blend_## name##_##depth##bit(const uint8_t *_top, ptrdiff_t top_linesize,\
const uint8_t *_bottom, ptrdiff_t bottom_linesize, \
uint8_t *_dst, ptrdiff_t dst_linesize, \
ptrdiff_t width, ptrdiff_t height, \
FilterParams *param, double *values, int starty) \
{ \
const uint16_t *top = (const uint16_t*)_top; \
const uint16_t *bottom = (const uint16_t*)_bottom; \
uint16_t *dst = (uint16_t*)_dst; \
double opacity = param->opacity; \
int i, j; \
dst_linesize /= 2; \
top_linesize /= 2; \
bottom_linesize /= 2; \
\
for (i = 0; i < height; i++) { \
for (j = 0; j < width; j++) { \
dst[j] = top[j] + ((expr) - top[j]) * opacity; \
} \
dst += dst_linesize; \
top += top_linesize; \
bottom += bottom_linesize; \
} \
}
#define A top[j]
#define B bottom[j]
#define MULTIPLY(x, a, b) ((x) * (((a) * (b)) / 255))
#define SCREEN(x, a, b) (255 - (x) * ((255 - (a)) * (255 - (b)) / 255))
#define BURN(a, b) (((a) == 0) ? (a) : FFMAX(0, 255 - ((255 - (b)) << 8) / (a)))
#define DODGE(a, b) (((a) == 255) ? (a) : FFMIN(255, (((b) << 8) / (255 - (a)))))
DEFINE_BLEND8(addition, FFMIN(255, A + B))
DEFINE_BLEND8(grainmerge, av_clip_uint8(A + B - 128))
DEFINE_BLEND8(average, (A + B) / 2)
DEFINE_BLEND8(subtract, FFMAX(0, A - B))
DEFINE_BLEND8(multiply, MULTIPLY(1, A, B))
DEFINE_BLEND8(multiply128,av_clip_uint8((A - 128) * B / 32. + 128))
DEFINE_BLEND8(negation, 255 - FFABS(255 - A - B))
DEFINE_BLEND8(extremity, FFABS(255 - A - B))
DEFINE_BLEND8(difference, FFABS(A - B))
DEFINE_BLEND8(grainextract, av_clip_uint8(128 + A - B))
DEFINE_BLEND8(screen, SCREEN(1, A, B))
DEFINE_BLEND8(overlay, (A < 128) ? MULTIPLY(2, A, B) : SCREEN(2, A, B))
DEFINE_BLEND8(hardlight, (B < 128) ? MULTIPLY(2, B, A) : SCREEN(2, B, A))
DEFINE_BLEND8(hardmix, (A < (255 - B)) ? 0: 255)
DEFINE_BLEND8(heat, (A == 0) ? 0 : 255 - FFMIN(((255 - B) * (255 - B)) / A, 255))
DEFINE_BLEND8(freeze, (B == 0) ? 0 : 255 - FFMIN(((255 - A) * (255 - A)) / B, 255))
DEFINE_BLEND8(darken, FFMIN(A, B))
DEFINE_BLEND8(lighten, FFMAX(A, B))
DEFINE_BLEND8(divide, av_clip_uint8(B == 0 ? 255 : 255 * A / B))
DEFINE_BLEND8(dodge, DODGE(A, B))
DEFINE_BLEND8(burn, BURN(A, B))
DEFINE_BLEND8(softlight, (A > 127) ? B + (255 - B) * (A - 127.5) / 127.5 * (0.5 - fabs(B - 127.5) / 255): B - B * ((127.5 - A) / 127.5) * (0.5 - fabs(B - 127.5)/255))
DEFINE_BLEND8(exclusion, A + B - 2 * A * B / 255)
DEFINE_BLEND8(pinlight, (B < 128) ? FFMIN(A, 2 * B) : FFMAX(A, 2 * (B - 128)))
DEFINE_BLEND8(phoenix, FFMIN(A, B) - FFMAX(A, B) + 255)
DEFINE_BLEND8(reflect, (B == 255) ? B : FFMIN(255, (A * A / (255 - B))))
DEFINE_BLEND8(glow, (A == 255) ? A : FFMIN(255, (B * B / (255 - A))))
DEFINE_BLEND8(and, A & B)
DEFINE_BLEND8(or, A | B)
DEFINE_BLEND8(xor, A ^ B)
DEFINE_BLEND8(vividlight, (A < 128) ? BURN(2 * A, B) : DODGE(2 * (A - 128), B))
DEFINE_BLEND8(linearlight,av_clip_uint8((B < 128) ? B + 2 * A - 255 : B + 2 * (A - 128)))
#undef MULTIPLY
#undef SCREEN
#undef BURN
#undef DODGE
#define MULTIPLY(x, a, b) ((x) * (((a) * (b)) / 65535))
#define SCREEN(x, a, b) (65535 - (x) * ((65535 - (a)) * (65535 - (b)) / 65535))
#define BURN(a, b) (((a) == 0) ? (a) : FFMAX(0, 65535 - ((65535 - (b)) << 16) / (a)))
#define DODGE(a, b) (((a) == 65535) ? (a) : FFMIN(65535, (((b) << 16) / (65535 - (a)))))
DEFINE_BLEND16(addition, FFMIN(65535, A + B), 16)
DEFINE_BLEND16(grainmerge, av_clip_uint16(A + B - 32768), 16)
DEFINE_BLEND16(average, (A + B) / 2, 16)
DEFINE_BLEND16(subtract, FFMAX(0, A - B), 16)
DEFINE_BLEND16(multiply, MULTIPLY(1, A, B), 16)
DEFINE_BLEND16(multiply128, av_clip_uint16((A - 32768) * B / 8192. + 32768), 16)
DEFINE_BLEND16(negation, 65535 - FFABS(65535 - A - B), 16)
DEFINE_BLEND16(extremity, FFABS(65535 - A - B), 16)
DEFINE_BLEND16(difference, FFABS(A - B), 16)
DEFINE_BLEND16(grainextract, av_clip_uint16(32768 + A - B), 16)
DEFINE_BLEND16(screen, SCREEN(1, A, B), 16)
DEFINE_BLEND16(overlay, (A < 32768) ? MULTIPLY(2, A, B) : SCREEN(2, A, B), 16)
DEFINE_BLEND16(hardlight, (B < 32768) ? MULTIPLY(2, B, A) : SCREEN(2, B, A), 16)
DEFINE_BLEND16(hardmix, (A < (65535 - B)) ? 0: 65535, 16)
DEFINE_BLEND16(heat, (A == 0) ? 0 : 65535 - FFMIN(((65535 - B) * (65535 - B)) / A, 65535), 16)
DEFINE_BLEND16(freeze, (B == 0) ? 0 : 65535 - FFMIN(((65535 - A) * (65535 - A)) / B, 65535), 16)
DEFINE_BLEND16(darken, FFMIN(A, B), 16)
DEFINE_BLEND16(lighten, FFMAX(A, B), 16)
DEFINE_BLEND16(divide, av_clip_uint16(B == 0 ? 65535 : 65535 * A / B), 16)
DEFINE_BLEND16(dodge, DODGE(A, B), 16)
DEFINE_BLEND16(burn, BURN(A, B), 16)
DEFINE_BLEND16(softlight, (A > 32767) ? B + (65535 - B) * (A - 32767.5) / 32767.5 * (0.5 - fabs(B - 32767.5) / 65535): B - B * ((32767.5 - A) / 32767.5) * (0.5 - fabs(B - 32767.5)/65535), 16)
DEFINE_BLEND16(exclusion, A + B - 2 * A * B / 65535, 16)
DEFINE_BLEND16(pinlight, (B < 32768) ? FFMIN(A, 2 * B) : FFMAX(A, 2 * (B - 32768)), 16)
DEFINE_BLEND16(phoenix, FFMIN(A, B) - FFMAX(A, B) + 65535, 16)
DEFINE_BLEND16(reflect, (B == 65535) ? B : FFMIN(65535, (A * A / (65535 - B))), 16)
DEFINE_BLEND16(glow, (A == 65535) ? A : FFMIN(65535, (B * B / (65535 - A))), 16)
DEFINE_BLEND16(and, A & B, 16)
DEFINE_BLEND16(or, A | B, 16)
DEFINE_BLEND16(xor, A ^ B, 16)
DEFINE_BLEND16(vividlight, (A < 32768) ? BURN(2 * A, B) : DODGE(2 * (A - 32768), B), 16)
DEFINE_BLEND16(linearlight,av_clip_uint16((B < 32768) ? B + 2 * A - 65535 : B + 2 * (A - 32768)), 16)
#undef MULTIPLY
#undef SCREEN
#undef BURN
#undef DODGE
#define MULTIPLY(x, a, b) ((x) * (((a) * (b)) / 1023))
#define SCREEN(x, a, b) (1023 - (x) * ((1023 - (a)) * (1023 - (b)) / 1023))
#define BURN(a, b) (((a) == 0) ? (a) : FFMAX(0, 1023 - ((1023 - (b)) << 10) / (a)))
#define DODGE(a, b) (((a) == 1023) ? (a) : FFMIN(1023, (((b) << 10) / (1023 - (a)))))
DEFINE_BLEND16(addition, FFMIN(1023, A + B), 10)
DEFINE_BLEND16(grainmerge, (int)av_clip_uintp2(A + B - 512, 10), 10)
DEFINE_BLEND16(average, (A + B) / 2, 10)
DEFINE_BLEND16(subtract, FFMAX(0, A - B), 10)
DEFINE_BLEND16(multiply, MULTIPLY(1, A, B), 10)
DEFINE_BLEND16(multiply128, (int)av_clip_uintp2((A - 512) * B / 128. + 512, 10), 10)
DEFINE_BLEND16(negation, 1023 - FFABS(1023 - A - B), 10)
DEFINE_BLEND16(extremity, FFABS(1023 - A - B), 10)
DEFINE_BLEND16(difference, FFABS(A - B), 10)
DEFINE_BLEND16(grainextract, (int)av_clip_uintp2(512 + A - B, 10), 10)
DEFINE_BLEND16(screen, SCREEN(1, A, B), 10)
DEFINE_BLEND16(overlay, (A < 512) ? MULTIPLY(2, A, B) : SCREEN(2, A, B), 10)
DEFINE_BLEND16(hardlight, (B < 512) ? MULTIPLY(2, B, A) : SCREEN(2, B, A), 10)
DEFINE_BLEND16(hardmix, (A < (1023 - B)) ? 0: 1023, 10)
DEFINE_BLEND16(heat, (A == 0) ? 0 : 1023 - FFMIN(((1023 - B) * (1023 - B)) / A, 1023), 10)
DEFINE_BLEND16(freeze, (B == 0) ? 0 : 1023 - FFMIN(((1023 - A) * (1023 - A)) / B, 1023), 10)
DEFINE_BLEND16(darken, FFMIN(A, B), 10)
DEFINE_BLEND16(lighten, FFMAX(A, B), 10)
DEFINE_BLEND16(divide, (int)av_clip_uintp2(B == 0 ? 1023 : 1023 * A / B, 10), 10)
DEFINE_BLEND16(dodge, DODGE(A, B), 10)
DEFINE_BLEND16(burn, BURN(A, B), 10)
DEFINE_BLEND16(softlight, (A > 511) ? B + (1023 - B) * (A - 511.5) / 511.5 * (0.5 - fabs(B - 511.5) / 1023): B - B * ((511.5 - A) / 511.5) * (0.5 - fabs(B - 511.5)/1023), 10)
DEFINE_BLEND16(exclusion, A + B - 2 * A * B / 1023, 10)
DEFINE_BLEND16(pinlight, (B < 512) ? FFMIN(A, 2 * B) : FFMAX(A, 2 * (B - 512)), 10)
DEFINE_BLEND16(phoenix, FFMIN(A, B) - FFMAX(A, B) + 1023, 10)
DEFINE_BLEND16(reflect, (B == 1023) ? B : FFMIN(1023, (A * A / (1023 - B))), 10)
DEFINE_BLEND16(glow, (A == 1023) ? A : FFMIN(1023, (B * B / (1023 - A))), 10)
DEFINE_BLEND16(and, A & B, 10)
DEFINE_BLEND16(or, A | B, 10)
DEFINE_BLEND16(xor, A ^ B, 10)
DEFINE_BLEND16(vividlight, (A < 512) ? BURN(2 * A, B) : DODGE(2 * (A - 512), B), 10)
DEFINE_BLEND16(linearlight,(int)av_clip_uintp2((B < 512) ? B + 2 * A - 1023 : B + 2 * (A - 512), 10), 10)
#undef MULTIPLY
#undef SCREEN
#undef BURN
#undef DODGE
#define MULTIPLY(x, a, b) ((x) * (((a) * (b)) / 4095))
#define SCREEN(x, a, b) (4095 - (x) * ((4095 - (a)) * (4095 - (b)) / 4095))
#define BURN(a, b) (((a) == 0) ? (a) : FFMAX(0, 4095 - ((4095 - (b)) << 12) / (a)))
#define DODGE(a, b) (((a) == 4095) ? (a) : FFMIN(4095, (((b) << 12) / (4095 - (a)))))
DEFINE_BLEND16(addition, FFMIN(4095, A + B), 12)
DEFINE_BLEND16(grainmerge, (int)av_clip_uintp2(A + B - 2048, 12), 12)
DEFINE_BLEND16(average, (A + B) / 2, 12)
DEFINE_BLEND16(subtract, FFMAX(0, A - B), 12)
DEFINE_BLEND16(multiply, MULTIPLY(1, A, B), 12)
DEFINE_BLEND16(multiply128, (int)av_clip_uintp2((A - 2048) * B / 512. + 2048, 12), 12)
DEFINE_BLEND16(negation, 4095 - FFABS(4095 - A - B), 12)
DEFINE_BLEND16(extremity, FFABS(4095 - A - B), 12)
DEFINE_BLEND16(difference, FFABS(A - B), 12)
DEFINE_BLEND16(grainextract, (int)av_clip_uintp2(2048 + A - B, 12), 12)
DEFINE_BLEND16(screen, SCREEN(1, A, B), 12)
DEFINE_BLEND16(overlay, (A < 2048) ? MULTIPLY(2, A, B) : SCREEN(2, A, B), 12)
DEFINE_BLEND16(hardlight, (B < 2048) ? MULTIPLY(2, B, A) : SCREEN(2, B, A), 12)
DEFINE_BLEND16(hardmix, (A < (4095 - B)) ? 0: 4095, 12)
DEFINE_BLEND16(heat, (A == 0) ? 0 : 4095 - FFMIN(((4095 - B) * (4095 - B)) / A, 4095), 12)
DEFINE_BLEND16(freeze, (B == 0) ? 0 : 4095 - FFMIN(((4095 - A) * (4095 - A)) / B, 4095), 12)
DEFINE_BLEND16(darken, FFMIN(A, B), 12)
DEFINE_BLEND16(lighten, FFMAX(A, B), 12)
DEFINE_BLEND16(divide, (int)av_clip_uintp2(B == 0 ? 4095 : 4095 * A / B, 12), 12)
DEFINE_BLEND16(dodge, DODGE(A, B), 12)
DEFINE_BLEND16(burn, BURN(A, B), 12)
DEFINE_BLEND16(softlight, (A > 2047) ? B + (4095 - B) * (A - 2047.5) / 2047.5 * (0.5 - fabs(B - 2047.5) / 4095): B - B * ((2047.5 - A) / 2047.5) * (0.5 - fabs(B - 2047.5)/4095), 12)
DEFINE_BLEND16(exclusion, A + B - 2 * A * B / 4095, 12)
DEFINE_BLEND16(pinlight, (B < 2048) ? FFMIN(A, 2 * B) : FFMAX(A, 2 * (B - 2048)), 12)
DEFINE_BLEND16(phoenix, FFMIN(A, B) - FFMAX(A, B) + 4095, 12)
DEFINE_BLEND16(reflect, (B == 4095) ? B : FFMIN(4095, (A * A / (4095 - B))), 12)
DEFINE_BLEND16(glow, (A == 4095) ? A : FFMIN(4095, (B * B / (4095 - A))), 12)
DEFINE_BLEND16(and, A & B, 12)
DEFINE_BLEND16(or, A | B, 12)
DEFINE_BLEND16(xor, A ^ B, 12)
DEFINE_BLEND16(vividlight, (A < 2048) ? BURN(2 * A, B) : DODGE(2 * (A - 2048), B), 12)
DEFINE_BLEND16(linearlight,(int)av_clip_uintp2((B < 2048) ? B + 2 * A - 4095 : B + 2 * (A - 2048), 12), 12)
#undef MULTIPLY
#undef SCREEN
#undef BURN
#undef DODGE
#define MULTIPLY(x, a, b) ((x) * (((a) * (b)) / 511))
#define SCREEN(x, a, b) (511 - (x) * ((511 - (a)) * (511 - (b)) / 511))
#define BURN(a, b) (((a) == 0) ? (a) : FFMAX(0, 511 - ((511 - (b)) << 9) / (a)))
#define DODGE(a, b) (((a) == 511) ? (a) : FFMIN(511, (((b) << 9) / (511 - (a)))))
DEFINE_BLEND16(addition, FFMIN(511, A + B), 9)
DEFINE_BLEND16(grainmerge, (int)av_clip_uintp2(A + B - 256, 9), 9)
DEFINE_BLEND16(average, (A + B) / 2, 9)
DEFINE_BLEND16(subtract, FFMAX(0, A - B), 9)
DEFINE_BLEND16(multiply, MULTIPLY(1, A, B), 9)
DEFINE_BLEND16(multiply128, (int)av_clip_uintp2((A - 256) * B / 64. + 256, 9), 9)
DEFINE_BLEND16(negation, 511 - FFABS(511 - A - B), 9)
DEFINE_BLEND16(extremity, FFABS(511 - A - B), 9)
DEFINE_BLEND16(difference, FFABS(A - B), 9)
DEFINE_BLEND16(grainextract, (int)av_clip_uintp2(256 + A - B, 9), 9)
DEFINE_BLEND16(screen, SCREEN(1, A, B), 9)
DEFINE_BLEND16(overlay, (A < 256) ? MULTIPLY(2, A, B) : SCREEN(2, A, B), 9)
DEFINE_BLEND16(hardlight, (B < 256) ? MULTIPLY(2, B, A) : SCREEN(2, B, A), 9)
DEFINE_BLEND16(hardmix, (A < (511 - B)) ? 0: 511, 9)
DEFINE_BLEND16(heat, (A == 0) ? 0 : 511 - FFMIN(((511 - B) * (511 - B)) / A, 511), 9)
DEFINE_BLEND16(freeze, (B == 0) ? 0 : 511 - FFMIN(((511 - A) * (511 - A)) / B, 511), 9)
DEFINE_BLEND16(darken, FFMIN(A, B), 9)
DEFINE_BLEND16(lighten, FFMAX(A, B), 9)
DEFINE_BLEND16(divide, (int)av_clip_uintp2(B == 0 ? 511 : 511 * A / B, 9), 9)
DEFINE_BLEND16(dodge, DODGE(A, B), 9)
DEFINE_BLEND16(burn, BURN(A, B), 9)
DEFINE_BLEND16(softlight, (A > 511) ? B + (511 - B) * (A - 511.5) / 511.5 * (0.5 - fabs(B - 511.5) / 511): B - B * ((511.5 - A) / 511.5) * (0.5 - fabs(B - 511.5)/511), 9)
DEFINE_BLEND16(exclusion, A + B - 2 * A * B / 511, 9)
DEFINE_BLEND16(pinlight, (B < 256) ? FFMIN(A, 2 * B) : FFMAX(A, 2 * (B - 256)), 9)
DEFINE_BLEND16(phoenix, FFMIN(A, B) - FFMAX(A, B) + 511, 9)
DEFINE_BLEND16(reflect, (B == 511) ? B : FFMIN(511, (A * A / (511 - B))), 9)
DEFINE_BLEND16(glow, (A == 511) ? A : FFMIN(511, (B * B / (511 - A))), 9)
DEFINE_BLEND16(and, A & B, 9)
DEFINE_BLEND16(or, A | B, 9)
DEFINE_BLEND16(xor, A ^ B, 9)
DEFINE_BLEND16(vividlight, (A < 256) ? BURN(2 * A, B) : DODGE(2 * (A - 256), B), 9)
DEFINE_BLEND16(linearlight,(int)av_clip_uintp2((B < 256) ? B + 2 * A - 511 : B + 2 * (A - 256), 9), 9)
#define DEFINE_BLEND_EXPR(type, name, div) \
static void blend_expr_## name(const uint8_t *_top, ptrdiff_t top_linesize, \
const uint8_t *_bottom, ptrdiff_t bottom_linesize, \
uint8_t *_dst, ptrdiff_t dst_linesize, \
ptrdiff_t width, ptrdiff_t height, \
FilterParams *param, double *values, int starty) \
{ \
const type *top = (type*)_top; \
const type *bottom = (type*)_bottom; \
type *dst = (type*)_dst; \
AVExpr *e = param->e; \
int y, x; \
dst_linesize /= div; \
top_linesize /= div; \
bottom_linesize /= div; \
\
for (y = 0; y < height; y++) { \
values[VAR_Y] = y + starty; \
for (x = 0; x < width; x++) { \
values[VAR_X] = x; \
values[VAR_TOP] = values[VAR_A] = top[x]; \
values[VAR_BOTTOM] = values[VAR_B] = bottom[x]; \
dst[x] = av_expr_eval(e, values, NULL); \
} \
dst += dst_linesize; \
top += top_linesize; \
bottom += bottom_linesize; \
} \
}
DEFINE_BLEND_EXPR(uint8_t, 8bit, 1)
DEFINE_BLEND_EXPR(uint16_t, 16bit, 2)
static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
ThreadData *td = arg;
int slice_start = (td->h * jobnr ) / nb_jobs;
int slice_end = (td->h * (jobnr+1)) / nb_jobs;
int height = slice_end - slice_start;
const uint8_t *top = td->top->data[td->plane];
const uint8_t *bottom = td->bottom->data[td->plane];
uint8_t *dst = td->dst->data[td->plane];
double values[VAR_VARS_NB];
values[VAR_N] = td->inlink->frame_count_out;
values[VAR_T] = td->dst->pts == AV_NOPTS_VALUE ? NAN : td->dst->pts * av_q2d(td->inlink->time_base);
values[VAR_W] = td->w;
values[VAR_H] = td->h;
values[VAR_SW] = td->w / (double)td->dst->width;
values[VAR_SH] = td->h / (double)td->dst->height;
td->param->blend(top + slice_start * td->top->linesize[td->plane],
td->top->linesize[td->plane],
bottom + slice_start * td->bottom->linesize[td->plane],
td->bottom->linesize[td->plane],
dst + slice_start * td->dst->linesize[td->plane],
td->dst->linesize[td->plane],
td->w, height, td->param, &values[0], slice_start);
return 0;
}
static AVFrame *blend_frame(AVFilterContext *ctx, AVFrame *top_buf,
const AVFrame *bottom_buf)
{
BlendContext *s = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *dst_buf;
int plane;
dst_buf = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!dst_buf)
return top_buf;
av_frame_copy_props(dst_buf, top_buf);
for (plane = 0; plane < s->nb_planes; plane++) {
int hsub = plane == 1 || plane == 2 ? s->hsub : 0;
int vsub = plane == 1 || plane == 2 ? s->vsub : 0;
int outw = AV_CEIL_RSHIFT(dst_buf->width, hsub);
int outh = AV_CEIL_RSHIFT(dst_buf->height, vsub);
FilterParams *param = &s->params[plane];
ThreadData td = { .top = top_buf, .bottom = bottom_buf, .dst = dst_buf,
.w = outw, .h = outh, .param = param, .plane = plane,
.inlink = inlink };
ctx->internal->execute(ctx, filter_slice, &td, NULL, FFMIN(outh, ff_filter_get_nb_threads(ctx)));
}
if (!s->tblend)
av_frame_free(&top_buf);
return dst_buf;
}
static int blend_frame_for_dualinput(FFFrameSync *fs)
{
AVFilterContext *ctx = fs->parent;
AVFrame *top_buf, *bottom_buf, *dst_buf;
int ret;
ret = ff_framesync_dualinput_get(fs, &top_buf, &bottom_buf);
if (ret < 0)
return ret;
if (!bottom_buf)
return ff_filter_frame(ctx->outputs[0], top_buf);
dst_buf = blend_frame(ctx, top_buf, bottom_buf);
return ff_filter_frame(ctx->outputs[0], dst_buf);
}
static av_cold int init(AVFilterContext *ctx)
{
BlendContext *s = ctx->priv;
s->tblend = !strcmp(ctx->filter->name, "tblend");
s->fs.on_event = blend_frame_for_dualinput;
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ422P,AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P,
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_PIX_FMT_GRAY8,
AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_GBRP9,
AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV440P10,
AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GRAY10,
AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV440P12,
AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GRAY12,
AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
AV_PIX_FMT_GBRP16, AV_PIX_FMT_GBRAP16, AV_PIX_FMT_GRAY16,
AV_PIX_FMT_NONE
};
AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
if (!fmts_list)
return AVERROR(ENOMEM);
return ff_set_common_formats(ctx, fmts_list);
}
static av_cold void uninit(AVFilterContext *ctx)
{
BlendContext *s = ctx->priv;
int i;
ff_framesync_uninit(&s->fs);
av_frame_free(&s->prev_frame);
for (i = 0; i < FF_ARRAY_ELEMS(s->params); i++)
av_expr_free(s->params[i].e);
}
#define DEFINE_INIT_BLEND_FUNC(depth, nbits) \
static av_cold void init_blend_func_##depth##_##nbits##bit(FilterParams *param) \
{ \
switch (param->mode) { \
case BLEND_ADDITION: param->blend = blend_addition_##depth##bit; break; \
case BLEND_GRAINMERGE: param->blend = blend_grainmerge_##depth##bit; break; \
case BLEND_AND: param->blend = blend_and_##depth##bit; break; \
case BLEND_AVERAGE: param->blend = blend_average_##depth##bit; break; \
case BLEND_BURN: param->blend = blend_burn_##depth##bit; break; \
case BLEND_DARKEN: param->blend = blend_darken_##depth##bit; break; \
case BLEND_DIFFERENCE: param->blend = blend_difference_##depth##bit; break; \
case BLEND_GRAINEXTRACT: param->blend = blend_grainextract_##depth##bit; break; \
case BLEND_DIVIDE: param->blend = blend_divide_##depth##bit; break; \
case BLEND_DODGE: param->blend = blend_dodge_##depth##bit; break; \
case BLEND_EXCLUSION: param->blend = blend_exclusion_##depth##bit; break; \
case BLEND_EXTREMITY: param->blend = blend_extremity_##depth##bit; break; \
case BLEND_FREEZE: param->blend = blend_freeze_##depth##bit; break; \
case BLEND_GLOW: param->blend = blend_glow_##depth##bit; break; \
case BLEND_HARDLIGHT: param->blend = blend_hardlight_##depth##bit; break; \
case BLEND_HARDMIX: param->blend = blend_hardmix_##depth##bit; break; \
case BLEND_HEAT: param->blend = blend_heat_##depth##bit; break; \
case BLEND_LIGHTEN: param->blend = blend_lighten_##depth##bit; break; \
case BLEND_LINEARLIGHT: param->blend = blend_linearlight_##depth##bit; break; \
case BLEND_MULTIPLY: param->blend = blend_multiply_##depth##bit; break; \
case BLEND_MULTIPLY128: param->blend = blend_multiply128_##depth##bit; break; \
case BLEND_NEGATION: param->blend = blend_negation_##depth##bit; break; \
case BLEND_NORMAL: param->blend = blend_normal_##nbits##bit; break; \
case BLEND_OR: param->blend = blend_or_##depth##bit; break; \
case BLEND_OVERLAY: param->blend = blend_overlay_##depth##bit; break; \
case BLEND_PHOENIX: param->blend = blend_phoenix_##depth##bit; break; \
case BLEND_PINLIGHT: param->blend = blend_pinlight_##depth##bit; break; \
case BLEND_REFLECT: param->blend = blend_reflect_##depth##bit; break; \
case BLEND_SCREEN: param->blend = blend_screen_##depth##bit; break; \
case BLEND_SOFTLIGHT: param->blend = blend_softlight_##depth##bit; break; \
case BLEND_SUBTRACT: param->blend = blend_subtract_##depth##bit; break; \
case BLEND_VIVIDLIGHT: param->blend = blend_vividlight_##depth##bit; break; \
case BLEND_XOR: param->blend = blend_xor_##depth##bit; break; \
} \
}
DEFINE_INIT_BLEND_FUNC(8, 8)
DEFINE_INIT_BLEND_FUNC(9, 16)
DEFINE_INIT_BLEND_FUNC(10, 16)
DEFINE_INIT_BLEND_FUNC(12, 16)
DEFINE_INIT_BLEND_FUNC(16, 16)
void ff_blend_init(FilterParams *param, int depth)
{
switch (depth) {
case 8:
init_blend_func_8_8bit(param);
break;
case 9:
init_blend_func_9_16bit(param);
break;
case 10:
init_blend_func_10_16bit(param);
break;
case 12:
init_blend_func_12_16bit(param);
break;
case 16:
init_blend_func_16_16bit(param);
break;
}
if (param->opacity == 0 && param->mode != BLEND_NORMAL) {
param->blend = depth > 8 ? blend_copytop_16 : blend_copytop_8;
} else if (param->mode == BLEND_NORMAL) {
if (param->opacity == 1)
param->blend = depth > 8 ? blend_copytop_16 : blend_copytop_8;
else if (param->opacity == 0)
param->blend = depth > 8 ? blend_copybottom_16 : blend_copybottom_8;
}
if (ARCH_X86)
ff_blend_init_x86(param, depth);
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
AVFilterLink *toplink = ctx->inputs[TOP];
BlendContext *s = ctx->priv;
const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(toplink->format);
int ret, plane;
if (!s->tblend) {
AVFilterLink *bottomlink = ctx->inputs[BOTTOM];
if (toplink->format != bottomlink->format) {
av_log(ctx, AV_LOG_ERROR, "inputs must be of same pixel format\n");
return AVERROR(EINVAL);
}
if (toplink->w != bottomlink->w || toplink->h != bottomlink->h) {
av_log(ctx, AV_LOG_ERROR, "First input link %s parameters "
"(size %dx%d) do not match the corresponding "
"second input link %s parameters (size %dx%d)\n",
ctx->input_pads[TOP].name, toplink->w, toplink->h,
ctx->input_pads[BOTTOM].name, bottomlink->w, bottomlink->h);
return AVERROR(EINVAL);
}
}
outlink->w = toplink->w;
outlink->h = toplink->h;
outlink->time_base = toplink->time_base;
outlink->sample_aspect_ratio = toplink->sample_aspect_ratio;
outlink->frame_rate = toplink->frame_rate;
s->hsub = pix_desc->log2_chroma_w;
s->vsub = pix_desc->log2_chroma_h;
s->depth = pix_desc->comp[0].depth;
s->nb_planes = av_pix_fmt_count_planes(toplink->format);
if (!s->tblend)
if ((ret = ff_framesync_init_dualinput(&s->fs, ctx)) < 0)
return ret;
for (plane = 0; plane < FF_ARRAY_ELEMS(s->params); plane++) {
FilterParams *param = &s->params[plane];
if (s->all_mode >= 0)
param->mode = s->all_mode;
if (s->all_opacity < 1)
param->opacity = s->all_opacity;
ff_blend_init(param, s->depth);
if (s->all_expr && !param->expr_str) {
param->expr_str = av_strdup(s->all_expr);
if (!param->expr_str)
return AVERROR(ENOMEM);
}
if (param->expr_str) {
ret = av_expr_parse(&param->e, param->expr_str, var_names,
NULL, NULL, NULL, NULL, 0, ctx);
if (ret < 0)
return ret;
param->blend = s->depth > 8 ? blend_expr_16bit : blend_expr_8bit;
}
}
if (s->tblend)
return 0;
ret = ff_framesync_configure(&s->fs);
outlink->time_base = s->fs.time_base;
return ret;
}
#if CONFIG_BLEND_FILTER
static int activate(AVFilterContext *ctx)
{
BlendContext *s = ctx->priv;
return ff_framesync_activate(&s->fs);
}
static const AVFilterPad blend_inputs[] = {
{
.name = "top",
.type = AVMEDIA_TYPE_VIDEO,
},{
.name = "bottom",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
static const AVFilterPad blend_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
{ NULL }
};
AVFilter ff_vf_blend = {
.name = "blend",
.description = NULL_IF_CONFIG_SMALL("Blend two video frames into each other."),
.preinit = blend_framesync_preinit,
.init = init,
.uninit = uninit,
.priv_size = sizeof(BlendContext),
.query_formats = query_formats,
.activate = activate,
.inputs = blend_inputs,
.outputs = blend_outputs,
.priv_class = &blend_class,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL | AVFILTER_FLAG_SLICE_THREADS,
};
#endif
#if CONFIG_TBLEND_FILTER
static int tblend_filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
AVFilterContext *ctx = inlink->dst;
BlendContext *s = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
if (s->prev_frame) {
AVFrame *out;
if (ctx->is_disabled)
out = av_frame_clone(frame);
else
out = blend_frame(ctx, frame, s->prev_frame);
av_frame_free(&s->prev_frame);
s->prev_frame = frame;
return ff_filter_frame(outlink, out);
}
s->prev_frame = frame;
return 0;
}
static const AVOption tblend_options[] = {
COMMON_OPTIONS,
{ NULL }
};
AVFILTER_DEFINE_CLASS(tblend);
static const AVFilterPad tblend_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = tblend_filter_frame,
},
{ NULL }
};
static const AVFilterPad tblend_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
{ NULL }
};
AVFilter ff_vf_tblend = {
.name = "tblend",
.description = NULL_IF_CONFIG_SMALL("Blend successive frames."),
.priv_size = sizeof(BlendContext),
.priv_class = &tblend_class,
.query_formats = query_formats,
.init = init,
.uninit = uninit,
.inputs = tblend_inputs,
.outputs = tblend_outputs,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL | AVFILTER_FLAG_SLICE_THREADS,
};
#endif
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