mirror of https://git.ffmpeg.org/ffmpeg.git
262 lines
11 KiB
C
262 lines
11 KiB
C
/*
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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 "config_components.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "drawutils.h"
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#include "internal.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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uint8_t 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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double scale;
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int depth;
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int max;
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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 int do_colorkey_pixel(const uint8_t *colorkey_rgba, int r, int g, int b,
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float similarity, float iblend, int max, double scale)
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{
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double dr, dg, db, diff;
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dr = r * scale - colorkey_rgba[0];
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dg = g * scale - colorkey_rgba[1];
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db = b * scale - colorkey_rgba[2];
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diff = sqrt((dr * dr + dg * dg + db * db) / (255.0 * 255.0 * 3.0));
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if (iblend < 10000.0) {
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return av_clipd((diff - similarity) * iblend, 0.0, 1.0) * max;
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} else {
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return (diff > similarity) ? max : 0;
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}
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}
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#define COLORKEY_SLICE(name, type) \
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static int do_colorkey_slice##name(AVFilterContext *avctx, \
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void *arg, \
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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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const float similarity = ctx->similarity; \
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const float iblend = 1.f / ctx->blend; \
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const uint8_t *colorkey_rgba = ctx->colorkey_rgba; \
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const uint8_t *co = ctx->co; \
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const double scale = ctx->scale; \
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const int max = ctx->max; \
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\
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for (int y = slice_start; y < slice_end; y++) { \
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type *dst = (type *)(frame->data[0] + y * frame->linesize[0]);\
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\
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for (int x = 0; x < frame->width; x++) { \
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const int o = x * 4; \
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\
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dst[o + co[3]] = do_colorkey_pixel(colorkey_rgba, \
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dst[o + co[0]], \
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dst[o + co[1]], \
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dst[o + co[2]], \
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similarity, iblend, max, scale); \
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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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COLORKEY_SLICE(8, uint8_t)
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COLORKEY_SLICE(16, uint16_t)
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#define COLORHOLD_SLICE(name, type, htype) \
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static int do_colorhold_slice##name(AVFilterContext *avctx, void *arg, \
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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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const int depth = ctx->depth; \
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const int max = ctx->max; \
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const int half = max / 2; \
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const uint8_t *co = ctx->co; \
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const uint8_t *colorkey_rgba = ctx->colorkey_rgba; \
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const float similarity = ctx->similarity; \
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const float iblend = 1.f / ctx->blend; \
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const double scale = ctx->scale; \
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\
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for (int y = slice_start; y < slice_end; ++y) { \
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type *dst = (type *)(frame->data[0] + y * frame->linesize[0]); \
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\
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for (int x = 0; x < frame->width; ++x) { \
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int o, t, r, g, b; \
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\
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o = x * 4; \
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r = dst[o + co[0]]; \
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g = dst[o + co[1]]; \
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b = dst[o + co[2]]; \
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\
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t = do_colorkey_pixel(colorkey_rgba, r, g, b, \
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similarity, iblend, max, scale); \
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\
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if (t > 0) { \
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htype a = (r + g + b) / 3; \
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htype rt = max - t; \
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\
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dst[o + co[0]] = (a * t + r * rt + half) >> depth; \
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dst[o + co[1]] = (a * t + g * rt + half) >> depth; \
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dst[o + co[2]] = (a * t + b * rt + half) >> depth; \
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} \
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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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COLORHOLD_SLICE(8, uint8_t, int)
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COLORHOLD_SLICE(16, uint16_t, int64_t)
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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 = ff_filter_execute(avctx, ctx->do_slice, frame, NULL,
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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(avctx->inputs[0]->format);
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ctx->depth = desc->comp[0].depth;
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ctx->max = (1 << ctx->depth) - 1;
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ctx->scale = 255.0 / ctx->max;
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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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ff_fill_rgba_map(ctx->co, outlink->format);
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if (!strcmp(avctx->filter->name, "colorkey")) {
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ctx->do_slice = ctx->max == 255 ? do_colorkey_slice8 : do_colorkey_slice16;
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} else {
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ctx->do_slice = ctx->max == 255 ? do_colorhold_slice8 : do_colorhold_slice16;
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}
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return 0;
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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_RGBA64,
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AV_PIX_FMT_BGRA64,
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AV_PIX_FMT_NONE
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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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.flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
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.filter_frame = filter_frame,
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},
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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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};
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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 }, 0.00001, 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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const 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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FILTER_INPUTS(colorkey_inputs),
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FILTER_OUTPUTS(colorkey_outputs),
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FILTER_PIXFMTS_ARRAY(pixel_fmts),
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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 }, 0.00001, 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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const 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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FILTER_INPUTS(colorkey_inputs),
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FILTER_OUTPUTS(colorkey_outputs),
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FILTER_PIXFMTS_ARRAY(pixel_fmts),
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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 */
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