2017-08-28 12:32:25 +00:00
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/*
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* Copyright (c) 2017 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/opt.h"
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#include "libavutil/imgutils.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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typedef struct DespillContext {
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const AVClass *class;
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int co[4]; /* color offsets rgba */
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int alpha;
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int type;
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float spillmix;
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float spillexpand;
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float redscale;
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float greenscale;
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float bluescale;
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float brightness;
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} DespillContext;
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static int do_despill_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
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{
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DespillContext *s = ctx->priv;
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AVFrame *frame = arg;
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const int ro = s->co[0], go = s->co[1], bo = s->co[2], ao = s->co[3];
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const int slice_start = (frame->height * jobnr) / nb_jobs;
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const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs;
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const float brightness = s->brightness;
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const float redscale = s->redscale;
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const float greenscale = s->greenscale;
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const float bluescale = s->bluescale;
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const float spillmix = s->spillmix;
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const float factor = (1.f - spillmix) * (1.f - s->spillexpand);
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float red, green, blue;
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int x, y;
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for (y = slice_start; y < slice_end; y++) {
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uint8_t *dst = frame->data[0] + y * frame->linesize[0];
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for (x = 0; x < frame->width; x++) {
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float spillmap;
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red = dst[x * 4 + ro] / 255.f;
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green = dst[x * 4 + go] / 255.f;
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blue = dst[x * 4 + bo] / 255.f;
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if (s->type) {
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spillmap = FFMAX(blue - (red * spillmix + green * factor), 0.f);
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} else {
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spillmap = FFMAX(green - (red * spillmix + blue * factor), 0.f);
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}
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red = FFMAX(red + spillmap * redscale + brightness * spillmap, 0.f);
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green = FFMAX(green + spillmap * greenscale + brightness * spillmap, 0.f);
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blue = FFMAX(blue + spillmap * bluescale + brightness * spillmap, 0.f);
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dst[x * 4 + ro] = av_clip_uint8(red * 255);
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dst[x * 4 + go] = av_clip_uint8(green * 255);
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dst[x * 4 + bo] = av_clip_uint8(blue * 255);
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if (s->alpha) {
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spillmap = 1.f - spillmap;
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dst[x * 4 + ao] = av_clip_uint8(spillmap * 255);
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}
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}
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}
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return 0;
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}
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static int filter_frame(AVFilterLink *link, AVFrame *frame)
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{
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AVFilterContext *ctx = link->dst;
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int ret;
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2021-08-15 19:33:25 +00:00
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if (ret = ff_filter_execute(ctx, do_despill_slice, frame, NULL,
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FFMIN(frame->height, ff_filter_get_nb_threads(ctx))))
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2017-08-28 12:32:25 +00:00
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return ret;
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return ff_filter_frame(ctx->outputs[0], frame);
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}
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static av_cold int config_output(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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DespillContext *s = ctx->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
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int i;
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for (i = 0; i < 4; ++i)
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s->co[i] = desc->comp[i].offset;
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return 0;
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}
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static av_cold int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat pixel_fmts[] = {
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AV_PIX_FMT_ARGB,
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AV_PIX_FMT_RGBA,
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AV_PIX_FMT_ABGR,
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AV_PIX_FMT_BGRA,
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AV_PIX_FMT_NONE
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};
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2021-08-09 23:25:31 +00:00
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return ff_set_common_formats_from_list(ctx, pixel_fmts);
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2017-08-28 12:32:25 +00:00
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}
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static const AVFilterPad despill_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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2021-08-15 22:07:41 +00:00
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.flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
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2017-08-28 12:32:25 +00:00
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.filter_frame = filter_frame,
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},
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};
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static const AVFilterPad despill_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_output,
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},
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};
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#define OFFSET(x) offsetof(DespillContext, x)
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2020-11-18 16:34:52 +00:00
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
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2017-08-28 12:32:25 +00:00
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static const AVOption despill_options[] = {
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{ "type", "set the screen type", OFFSET(type), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "type" },
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{ "green", "greenscreen", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "type" },
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{ "blue", "bluescreen", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "type" },
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{ "mix", "set the spillmap mix", OFFSET(spillmix), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, 0, 1, FLAGS },
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{ "expand", "set the spillmap expand", OFFSET(spillexpand), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, 1, FLAGS },
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2017-09-14 16:05:57 +00:00
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{ "red", "set red scale", OFFSET(redscale), AV_OPT_TYPE_FLOAT, {.dbl=0}, -100, 100, FLAGS },
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2017-08-28 12:32:25 +00:00
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{ "green", "set green scale", OFFSET(greenscale), AV_OPT_TYPE_FLOAT, {.dbl=-1}, -100, 100, FLAGS },
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{ "blue", "set blue scale", OFFSET(bluescale), AV_OPT_TYPE_FLOAT, {.dbl=0}, -100, 100, FLAGS },
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{ "brightness", "set brightness", OFFSET(brightness), AV_OPT_TYPE_FLOAT, {.dbl=0}, -10, 10, FLAGS },
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{ "alpha", "change alpha component", OFFSET(alpha), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(despill);
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2021-04-19 16:33:56 +00:00
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const AVFilter ff_vf_despill = {
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2017-08-28 12:32:25 +00:00
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.name = "despill",
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.description = NULL_IF_CONFIG_SMALL("Despill video."),
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.priv_size = sizeof(DespillContext),
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.priv_class = &despill_class,
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2021-08-12 11:05:31 +00:00
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FILTER_INPUTS(despill_inputs),
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FILTER_OUTPUTS(despill_outputs),
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2021-09-27 10:07:35 +00:00
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FILTER_QUERY_FUNC(query_formats),
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2020-11-18 16:34:52 +00:00
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.process_command = ff_filter_process_command,
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2017-08-28 12:32:25 +00:00
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
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};
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