GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavfilter/vf_colorkey.c Lines: 47 71 66.2 %
Date: 2020-08-13 15:06:06 Branches: 12 26 46.2 %

Line Branch Exec Source
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/*
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 * Copyright (c) 2015 Timo Rothenpieler <timo@rothenpieler.org>
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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 ColorkeyContext {
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    const AVClass *class;
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    /* color offsets rgba */
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    int co[4];
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    uint8_t colorkey_rgba[4];
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    float similarity;
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    float blend;
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    int (*do_slice)(AVFilterContext *ctx, void *arg,
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                    int jobnr, int nb_jobs);
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} ColorkeyContext;
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static uint8_t do_colorkey_pixel(ColorkeyContext *ctx, uint8_t r, uint8_t g, uint8_t b)
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{
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65536
    int dr = (int)r - ctx->colorkey_rgba[0];
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    int dg = (int)g - ctx->colorkey_rgba[1];
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    int db = (int)b - ctx->colorkey_rgba[2];
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    double diff = sqrt((dr * dr + dg * dg + db * db) / (255.0 * 255.0 * 3.0));
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    if (ctx->blend > 0.0001) {
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        return av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0) * 255.0;
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    } else {
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        return (diff > ctx->similarity) ? 255 : 0;
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    }
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}
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static int do_colorkey_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
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{
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    AVFrame *frame = arg;
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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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    ColorkeyContext *ctx = avctx->priv;
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    int o, x, y;
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    for (y = slice_start; y < slice_end; ++y) {
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65792
        for (x = 0; x < frame->width; ++x) {
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            o = frame->linesize[0] * y + x * 4;
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            frame->data[0][o + ctx->co[3]] =
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                do_colorkey_pixel(ctx,
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                                  frame->data[0][o + ctx->co[0]],
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                                  frame->data[0][o + ctx->co[1]],
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                                  frame->data[0][o + ctx->co[2]]);
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        }
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    }
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    return 0;
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}
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static int do_colorhold_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
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{
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    AVFrame *frame = arg;
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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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    ColorkeyContext *ctx = avctx->priv;
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    int x, y;
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    for (y = slice_start; y < slice_end; ++y) {
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        for (x = 0; x < frame->width; ++x) {
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            int o, t, r, g, b;
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            o = frame->linesize[0] * y + x * 4;
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            r = frame->data[0][o + ctx->co[0]];
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            g = frame->data[0][o + ctx->co[1]];
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            b = frame->data[0][o + ctx->co[2]];
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            t = do_colorkey_pixel(ctx, r, g, b);
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            if (t > 0) {
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                int a = (r + g + b) / 3;
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                int rt = 255 - t;
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                frame->data[0][o + ctx->co[0]] = (a * t + r * rt + 127) >> 8;
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                frame->data[0][o + ctx->co[1]] = (a * t + g * rt + 127) >> 8;
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                frame->data[0][o + ctx->co[2]] = (a * t + b * rt + 127) >> 8;
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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 av_cold int init_filter(AVFilterContext *avctx)
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{
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    ColorkeyContext *ctx = avctx->priv;
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    if (!strcmp(avctx->filter->name, "colorkey")) {
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        ctx->do_slice = do_colorkey_slice;
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    } else {
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        ctx->do_slice = do_colorhold_slice;
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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 *avctx = link->dst;
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    ColorkeyContext *ctx = avctx->priv;
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    int res;
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    if (res = av_frame_make_writable(frame))
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        return res;
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    if (res = avctx->internal->execute(avctx, ctx->do_slice, frame, NULL, FFMIN(frame->height, ff_filter_get_nb_threads(avctx))))
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        return res;
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    return ff_filter_frame(avctx->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 *avctx = outlink->src;
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    ColorkeyContext *ctx = avctx->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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    outlink->w = avctx->inputs[0]->w;
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    outlink->h = avctx->inputs[0]->h;
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    outlink->time_base = avctx->inputs[0]->time_base;
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    for (i = 0; i < 4; ++i)
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        ctx->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 *avctx)
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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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    AVFilterFormats *formats = NULL;
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    formats = ff_make_format_list(pixel_fmts);
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    if (!formats)
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        return AVERROR(ENOMEM);
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    return ff_set_common_formats(avctx, formats);
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}
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static const AVFilterPad colorkey_inputs[] = {
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    {
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        .name = "default",
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        .type = AVMEDIA_TYPE_VIDEO,
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        .filter_frame = filter_frame,
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    },
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    { NULL }
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};
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static const AVFilterPad colorkey_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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    { NULL }
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};
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#define OFFSET(x) offsetof(ColorkeyContext, x)
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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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#if CONFIG_COLORKEY_FILTER
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static const AVOption colorkey_options[] = {
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    { "color", "set the colorkey key color", OFFSET(colorkey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, 0, 0, FLAGS },
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    { "similarity", "set the colorkey similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.01, 1.0, FLAGS },
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    { "blend", "set the colorkey key blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
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    { NULL }
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};
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AVFILTER_DEFINE_CLASS(colorkey);
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AVFilter ff_vf_colorkey = {
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    .name          = "colorkey",
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    .description   = NULL_IF_CONFIG_SMALL("Turns a certain color into transparency. Operates on RGB colors."),
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    .priv_size     = sizeof(ColorkeyContext),
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    .priv_class    = &colorkey_class,
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    .query_formats = query_formats,
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    .init          = init_filter,
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    .inputs        = colorkey_inputs,
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    .outputs       = colorkey_outputs,
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    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
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    .process_command = ff_filter_process_command,
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};
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#endif /* CONFIG_COLORKEY_FILTER */
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#if CONFIG_COLORHOLD_FILTER
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static const AVOption colorhold_options[] = {
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    { "color", "set the colorhold key color", OFFSET(colorkey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, 0, 0, FLAGS },
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    { "similarity", "set the colorhold similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.01, 1.0, FLAGS },
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    { "blend", "set the colorhold blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
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    { NULL }
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};
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AVFILTER_DEFINE_CLASS(colorhold);
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AVFilter ff_vf_colorhold = {
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    .name          = "colorhold",
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    .description   = NULL_IF_CONFIG_SMALL("Turns a certain color range into gray. Operates on RGB colors."),
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    .priv_size     = sizeof(ColorkeyContext),
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    .priv_class    = &colorhold_class,
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    .query_formats = query_formats,
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    .init          = init_filter,
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    .inputs        = colorkey_inputs,
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    .outputs       = colorkey_outputs,
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    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
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    .process_command = ff_filter_process_command,
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};
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#endif /* CONFIG_COLORHOLD_FILTER */