| /* |
| * 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/pixdesc.h" |
| #include "avfilter.h" |
| #include "drawutils.h" |
| #include "internal.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 */ |