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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 "libavutil/opt.h"
- #include "libavutil/imgutils.h"
- #include "avfilter.h"
- #include "formats.h"
- #include "internal.h"
- #include "video.h"
- typedef struct ColorkeyContext {
- const AVClass *class;
- /* color offsets rgba */
- int co[4];
- uint8_t colorkey_rgba[4];
- float similarity;
- float blend;
- } ColorkeyContext;
- static uint8_t do_colorkey_pixel(ColorkeyContext *ctx, uint8_t r, uint8_t g, uint8_t b)
- {
- int dr = (int)r - ctx->colorkey_rgba[0];
- int dg = (int)g - ctx->colorkey_rgba[1];
- int db = (int)b - ctx->colorkey_rgba[2];
- double diff = sqrt((dr * dr + dg * dg + db * db) / (255.0 * 255.0));
- if (ctx->blend > 0.0001) {
- return av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0) * 255.0;
- } else {
- return (diff > ctx->similarity) ? 255 : 0;
- }
- }
- static int do_colorkey_slice(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;
- int o, x, y;
- for (y = slice_start; y < slice_end; ++y) {
- for (x = 0; x < frame->width; ++x) {
- o = frame->linesize[0] * y + x * 4;
- frame->data[0][o + ctx->co[3]] =
- do_colorkey_pixel(ctx,
- frame->data[0][o + ctx->co[0]],
- frame->data[0][o + ctx->co[1]],
- frame->data[0][o + ctx->co[2]]);
- }
- }
- return 0;
- }
- static int filter_frame(AVFilterLink *link, AVFrame *frame)
- {
- AVFilterContext *avctx = link->dst;
- int res;
- if (res = av_frame_make_writable(frame))
- return res;
- if (res = avctx->internal->execute(avctx, do_colorkey_slice, frame, NULL, FFMIN(frame->height, avctx->graph->nb_threads)))
- 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(outlink->format);
- int i;
- outlink->w = avctx->inputs[0]->w;
- outlink->h = avctx->inputs[0]->h;
- outlink->time_base = avctx->inputs[0]->time_base;
- for (i = 0; i < 4; ++i)
- ctx->co[i] = desc->comp[i].offset;
- return 0;
- }
- static av_cold int query_formats(AVFilterContext *avctx)
- {
- 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
- };
- AVFilterFormats *formats = NULL;
- formats = ff_make_format_list(pixel_fmts);
- if (!formats)
- return AVERROR(ENOMEM);
- return ff_set_common_formats(avctx, formats);
- }
- static const AVFilterPad colorkey_inputs[] = {
- {
- .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- .filter_frame = filter_frame,
- },
- { NULL }
- };
- static const AVFilterPad colorkey_outputs[] = {
- {
- .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- .config_props = config_output,
- },
- { NULL }
- };
- #define OFFSET(x) offsetof(ColorkeyContext, x)
- #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
- static const AVOption colorkey_options[] = {
- { "color", "set the colorkey key color", OFFSET(colorkey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS },
- { "similarity", "set the colorkey similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.01, 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);
- 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,
- .query_formats = query_formats,
- .inputs = colorkey_inputs,
- .outputs = colorkey_outputs,
- .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
- };
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