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/*
* Copyright (c) 2015 Timo Rothenpieler <timo@rothenpieler.org>
*
* 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 "config_components.h"
#include "libavutil/opt.h"
#include "libavutil/imgutils.h"
#include "avfilter.h"
#include "drawutils.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
typedef struct ColorkeyContext {
const AVClass *class;
/* color offsets rgba */
uint8_t co[4];
uint8_t colorkey_rgba[4];
float similarity;
float blend;
double scale;
int depth;
int max;
int (*do_slice)(AVFilterContext *ctx, void *arg,
int jobnr, int nb_jobs);
} ColorkeyContext;
static int do_colorkey_pixel(const uint8_t *colorkey_rgba, int r, int g, int b,
float similarity, float iblend, int max, double scale)
{
double dr, dg, db, diff;
dr = r * scale - colorkey_rgba[0];
dg = g * scale - colorkey_rgba[1];
db = b * scale - colorkey_rgba[2];
diff = sqrt((dr * dr + dg * dg + db * db) / (255.0 * 255.0 * 3.0));
if (iblend < 10000.0) {
return av_clipd((diff - similarity) * iblend, 0.0, 1.0) * max;
} else {
return (diff > similarity) ? max : 0;
}
}
#define COLORKEY_SLICE(name, type) \
static int do_colorkey_slice##name(AVFilterContext *avctx, \
void *arg, \
int jobnr, int nb_jobs) \
{ \
AVFrame *frame = arg; \
const int slice_start = (frame->height * jobnr) / nb_jobs; \
const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs; \
ColorkeyContext *ctx = avctx->priv; \
const float similarity = ctx->similarity; \
const float iblend = 1.f / ctx->blend; \
const uint8_t *colorkey_rgba = ctx->colorkey_rgba; \
const uint8_t *co = ctx->co; \
const double scale = ctx->scale; \
const int max = ctx->max; \
\
for (int y = slice_start; y < slice_end; y++) { \
type *dst = (type *)(frame->data[0] + y * frame->linesize[0]);\
\
for (int x = 0; x < frame->width; x++) { \
const int o = x * 4; \
\
dst[o + co[3]] = do_colorkey_pixel(colorkey_rgba, \
dst[o + co[0]], \
dst[o + co[1]], \
dst[o + co[2]], \
similarity, iblend, max, scale); \
} \
} \
\
return 0; \
}
COLORKEY_SLICE(8, uint8_t)
COLORKEY_SLICE(16, uint16_t)
#define COLORHOLD_SLICE(name, type, htype) \
static int do_colorhold_slice##name(AVFilterContext *avctx, void *arg, \
int jobnr, int nb_jobs) \
{ \
AVFrame *frame = arg; \
const int slice_start = (frame->height * jobnr) / nb_jobs; \
const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs; \
ColorkeyContext *ctx = avctx->priv; \
const int depth = ctx->depth; \
const int max = ctx->max; \
const int half = max / 2; \
const uint8_t *co = ctx->co; \
const uint8_t *colorkey_rgba = ctx->colorkey_rgba; \
const float similarity = ctx->similarity; \
const float iblend = 1.f / ctx->blend; \
const double scale = ctx->scale; \
\
for (int y = slice_start; y < slice_end; ++y) { \
type *dst = (type *)(frame->data[0] + y * frame->linesize[0]); \
\
for (int x = 0; x < frame->width; ++x) { \
int o, t, r, g, b; \
\
o = x * 4; \
r = dst[o + co[0]]; \
g = dst[o + co[1]]; \
b = dst[o + co[2]]; \
\
t = do_colorkey_pixel(colorkey_rgba, r, g, b, \
similarity, iblend, max, scale); \
\
if (t > 0) { \
htype a = (r + g + b) / 3; \
htype rt = max - t; \
\
dst[o + co[0]] = (a * t + r * rt + half) >> depth; \
dst[o + co[1]] = (a * t + g * rt + half) >> depth; \
dst[o + co[2]] = (a * t + b * rt + half) >> depth; \
} \
} \
} \
\
return 0; \
}
COLORHOLD_SLICE(8, uint8_t, int)
COLORHOLD_SLICE(16, uint16_t, int64_t)
static int filter_frame(AVFilterLink *link, AVFrame *frame)
{
AVFilterContext *avctx = link->dst;
ColorkeyContext *ctx = avctx->priv;
int res;
if (res = ff_filter_execute(avctx, ctx->do_slice, frame, NULL,
FFMIN(frame->height, ff_filter_get_nb_threads(avctx))))
return res;
return ff_filter_frame(avctx->outputs[0], frame);
}
static av_cold int config_output(AVFilterLink *outlink)
{
AVFilterContext *avctx = outlink->src;
ColorkeyContext *ctx = avctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->inputs[0]->format);
ctx->depth = desc->comp[0].depth;
ctx->max = (1 << ctx->depth) - 1;
ctx->scale = 255.0 / ctx->max;
outlink->w = avctx->inputs[0]->w;
outlink->h = avctx->inputs[0]->h;
outlink->time_base = avctx->inputs[0]->time_base;
ff_fill_rgba_map(ctx->co, outlink->format);
if (!strcmp(avctx->filter->name, "colorkey")) {
ctx->do_slice = ctx->max == 255 ? do_colorkey_slice8 : do_colorkey_slice16;
} else {
ctx->do_slice = ctx->max == 255 ? do_colorhold_slice8 : do_colorhold_slice16;
}
return 0;
}
static const enum AVPixelFormat pixel_fmts[] = {
AV_PIX_FMT_ARGB,
AV_PIX_FMT_RGBA,
AV_PIX_FMT_ABGR,
AV_PIX_FMT_BGRA,
AV_PIX_FMT_RGBA64,
AV_PIX_FMT_BGRA64,
AV_PIX_FMT_NONE
};
static const AVFilterPad colorkey_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
.filter_frame = filter_frame,
},
};
static const AVFilterPad colorkey_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
};
#define OFFSET(x) offsetof(ColorkeyContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
#if CONFIG_COLORKEY_FILTER
static const AVOption colorkey_options[] = {
{ "color", "set the colorkey key color", OFFSET(colorkey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, 0, 0, FLAGS },
{ "similarity", "set the colorkey similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.00001, 1.0, FLAGS },
{ "blend", "set the colorkey key blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(colorkey);
const AVFilter ff_vf_colorkey = {
.name = "colorkey",
.description = NULL_IF_CONFIG_SMALL("Turns a certain color into transparency. Operates on RGB colors."),
.priv_size = sizeof(ColorkeyContext),
.priv_class = &colorkey_class,
FILTER_INPUTS(colorkey_inputs),
FILTER_OUTPUTS(colorkey_outputs),
FILTER_PIXFMTS_ARRAY(pixel_fmts),
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
.process_command = ff_filter_process_command,
};
#endif /* CONFIG_COLORKEY_FILTER */
#if CONFIG_COLORHOLD_FILTER
static const AVOption colorhold_options[] = {
{ "color", "set the colorhold key color", OFFSET(colorkey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, 0, 0, FLAGS },
{ "similarity", "set the colorhold similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.00001, 1.0, FLAGS },
{ "blend", "set the colorhold blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(colorhold);
const AVFilter ff_vf_colorhold = {
.name = "colorhold",
.description = NULL_IF_CONFIG_SMALL("Turns a certain color range into gray. Operates on RGB colors."),
.priv_size = sizeof(ColorkeyContext),
.priv_class = &colorhold_class,
FILTER_INPUTS(colorkey_inputs),
FILTER_OUTPUTS(colorkey_outputs),
FILTER_PIXFMTS_ARRAY(pixel_fmts),
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
.process_command = ff_filter_process_command,
};
#endif /* CONFIG_COLORHOLD_FILTER */
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