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vf_despill.c
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/*
* Copyright (c) 2017 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/opt.h"
#include "libavutil/imgutils.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
typedef struct DespillContext {
const AVClass *class;
int co[4]; /* color offsets rgba */
int alpha;
int type;
float spillmix;
float spillexpand;
float redscale;
float greenscale;
float bluescale;
float brightness;
} DespillContext;
static int do_despill_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
DespillContext *s = ctx->priv;
AVFrame *frame = arg;
const int ro = s->co[0], go = s->co[1], bo = s->co[2], ao = s->co[3];
const int slice_start = (frame->height * jobnr) / nb_jobs;
const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs;
const float brightness = s->brightness;
const float redscale = s->redscale;
const float greenscale = s->greenscale;
const float bluescale = s->bluescale;
const float spillmix = s->spillmix;
const float factor = (1.f - spillmix) * (1.f - s->spillexpand);
float red, green, blue;
int x, y;
for (y = slice_start; y < slice_end; y++) {
uint8_t *dst = frame->data[0] + y * frame->linesize[0];
for (x = 0; x < frame->width; x++) {
float spillmap;
red = dst[x * 4 + ro] / 255.f;
green = dst[x * 4 + go] / 255.f;
blue = dst[x * 4 + bo] / 255.f;
if (s->type) {
spillmap = FFMAX(blue - (red * spillmix + green * factor), 0.f);
} else {
spillmap = FFMAX(green - (red * spillmix + blue * factor), 0.f);
}
red = FFMAX(red + spillmap * redscale + brightness * spillmap, 0.f);
green = FFMAX(green + spillmap * greenscale + brightness * spillmap, 0.f);
blue = FFMAX(blue + spillmap * bluescale + brightness * spillmap, 0.f);
dst[x * 4 + ro] = av_clip_uint8(red * 255);
dst[x * 4 + go] = av_clip_uint8(green * 255);
dst[x * 4 + bo] = av_clip_uint8(blue * 255);
if (s->alpha) {
spillmap = 1.f - spillmap;
dst[x * 4 + ao] = av_clip_uint8(spillmap * 255);
}
}
}
return 0;
}
static int filter_frame(AVFilterLink *link, AVFrame *frame)
{
AVFilterContext *ctx = link->dst;
int ret;
if (ret = ff_filter_execute(ctx, do_despill_slice, frame, NULL,
FFMIN(frame->height, ff_filter_get_nb_threads(ctx))))
return ret;
return ff_filter_frame(ctx->outputs[0], frame);
}
static av_cold int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
DespillContext *s = ctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
int i;
for (i = 0; i < 4; ++i)
s->co[i] = desc->comp[i].offset;
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_NONE
};
static const AVFilterPad despill_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
.filter_frame = filter_frame,
},
};
static const AVFilterPad despill_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
};
#define OFFSET(x) offsetof(DespillContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption despill_options[] = {
{ "type", "set the screen type", OFFSET(type), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "type" },
{ "green", "greenscreen", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "type" },
{ "blue", "bluescreen", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "type" },
{ "mix", "set the spillmap mix", OFFSET(spillmix), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, 0, 1, FLAGS },
{ "expand", "set the spillmap expand", OFFSET(spillexpand), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, 1, FLAGS },
{ "red", "set red scale", OFFSET(redscale), AV_OPT_TYPE_FLOAT, {.dbl=0}, -100, 100, FLAGS },
{ "green", "set green scale", OFFSET(greenscale), AV_OPT_TYPE_FLOAT, {.dbl=-1}, -100, 100, FLAGS },
{ "blue", "set blue scale", OFFSET(bluescale), AV_OPT_TYPE_FLOAT, {.dbl=0}, -100, 100, FLAGS },
{ "brightness", "set brightness", OFFSET(brightness), AV_OPT_TYPE_FLOAT, {.dbl=0}, -10, 10, FLAGS },
{ "alpha", "change alpha component", OFFSET(alpha), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(despill);
const AVFilter ff_vf_despill = {
.name = "despill",
.description = NULL_IF_CONFIG_SMALL("Despill video."),
.priv_size = sizeof(DespillContext),
.priv_class = &despill_class,
FILTER_INPUTS(despill_inputs),
FILTER_OUTPUTS(despill_outputs),
FILTER_PIXFMTS_ARRAY(pixel_fmts),
.process_command = ff_filter_process_command,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
};