200 lines
6.1 KiB
C
200 lines
6.1 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 "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 ChromakeyContext {
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const AVClass *class;
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uint8_t chromakey_rgba[4];
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uint8_t chromakey_uv[2];
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float similarity;
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float blend;
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int is_yuv;
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} ChromakeyContext;
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static uint8_t do_chromakey_pixel(ChromakeyContext *ctx, uint8_t u[9], uint8_t v[9])
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{
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double diff = 0.0;
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int du, dv, i;
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for (i = 0; i < 9; ++i) {
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du = (int)u[i] - ctx->chromakey_uv[0];
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dv = (int)v[i] - ctx->chromakey_uv[1];
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diff += sqrt((du * du + dv * dv) / (255.0 * 255.0));
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}
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diff /= 9.0;
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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 av_always_inline void get_pixel_uv(AVFrame *frame, int hsub_log2, int vsub_log2, int x, int y, uint8_t *u, uint8_t *v)
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{
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if (x < 0 || x >= frame->width || y < 0 || y >= frame->height)
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return;
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x >>= hsub_log2;
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y >>= vsub_log2;
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*u = frame->data[1][frame->linesize[1] * y + x];
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*v = frame->data[2][frame->linesize[2] * y + x];
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}
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static int do_chromakey_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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ChromakeyContext *ctx = avctx->priv;
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int hsub_log2 = 0, vsub_log2 = 0;
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int x, y, xo, yo;
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uint8_t u[9], v[9];
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memset(u, ctx->chromakey_uv[0], sizeof(u));
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memset(v, ctx->chromakey_uv[1], sizeof(v));
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if (frame->format == AV_PIX_FMT_YUVA420P || frame->format == AV_PIX_FMT_YUVA422P)
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hsub_log2 = 1;
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if (frame->format == AV_PIX_FMT_YUVA420P)
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vsub_log2 = 1;
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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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for (yo = 0; yo < 3; ++yo) {
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for (xo = 0; xo < 3; ++xo) {
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get_pixel_uv(frame, hsub_log2, vsub_log2, x + xo - 1, y + yo - 1, &u[yo * 3 + xo], &v[yo * 3 + xo]);
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}
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}
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frame->data[3][frame->linesize[3] * y + x] = do_chromakey_pixel(ctx, u, v);
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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 *avctx = link->dst;
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int res;
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if (res = avctx->internal->execute(avctx, do_chromakey_slice, frame, NULL, FFMIN(frame->height, avctx->graph->nb_threads)))
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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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#define FIXNUM(x) lrint((x) * (1 << 10))
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#define RGB_TO_U(rgb) (((- FIXNUM(0.16874) * rgb[0] - FIXNUM(0.33126) * rgb[1] + FIXNUM(0.50000) * rgb[2] + (1 << 9) - 1) >> 10) + 128)
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#define RGB_TO_V(rgb) ((( FIXNUM(0.50000) * rgb[0] - FIXNUM(0.41869) * rgb[1] - FIXNUM(0.08131) * rgb[2] + (1 << 9) - 1) >> 10) + 128)
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static av_cold int initialize_chromakey(AVFilterContext *avctx)
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{
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ChromakeyContext *ctx = avctx->priv;
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if (ctx->is_yuv) {
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ctx->chromakey_uv[0] = ctx->chromakey_rgba[1];
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ctx->chromakey_uv[1] = ctx->chromakey_rgba[2];
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} else {
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ctx->chromakey_uv[0] = RGB_TO_U(ctx->chromakey_rgba);
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ctx->chromakey_uv[1] = RGB_TO_V(ctx->chromakey_rgba);
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}
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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_YUVA420P,
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AV_PIX_FMT_YUVA422P,
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AV_PIX_FMT_YUVA444P,
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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 chromakey_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.needs_writable = 1,
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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 chromakey_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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#define OFFSET(x) offsetof(ChromakeyContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption chromakey_options[] = {
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{ "color", "set the chromakey key color", OFFSET(chromakey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "similarity", "set the chromakey similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.01, 1.0, FLAGS },
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{ "blend", "set the chromakey key blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
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{ "yuv", "color parameter is in yuv instead of rgb", OFFSET(is_yuv), 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(chromakey);
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AVFilter ff_vf_chromakey = {
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.name = "chromakey",
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.description = NULL_IF_CONFIG_SMALL("Turns a certain color into transparency. Operates on YUV colors."),
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.priv_size = sizeof(ChromakeyContext),
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.priv_class = &chromakey_class,
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.init = initialize_chromakey,
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.query_formats = query_formats,
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.inputs = chromakey_inputs,
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.outputs = chromakey_outputs,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
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};
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