| /* |
| * 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 ChromakeyContext { |
| const AVClass *class; |
| |
| uint8_t chromakey_rgba[4]; |
| uint8_t chromakey_uv[2]; |
| |
| float similarity; |
| float blend; |
| |
| int is_yuv; |
| |
| int hsub_log2; |
| int vsub_log2; |
| } ChromakeyContext; |
| |
| static uint8_t do_chromakey_pixel(ChromakeyContext *ctx, uint8_t u[9], uint8_t v[9]) |
| { |
| double diff = 0.0; |
| int du, dv, i; |
| |
| for (i = 0; i < 9; ++i) { |
| du = (int)u[i] - ctx->chromakey_uv[0]; |
| dv = (int)v[i] - ctx->chromakey_uv[1]; |
| |
| diff += sqrt((du * du + dv * dv) / (255.0 * 255.0)); |
| } |
| |
| diff /= 9.0; |
| |
| 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 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) |
| { |
| if (x < 0 || x >= frame->width || y < 0 || y >= frame->height) |
| return; |
| |
| x >>= hsub_log2; |
| y >>= vsub_log2; |
| |
| *u = frame->data[1][frame->linesize[1] * y + x]; |
| *v = frame->data[2][frame->linesize[2] * y + x]; |
| } |
| |
| static int do_chromakey_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; |
| |
| ChromakeyContext *ctx = avctx->priv; |
| |
| int x, y, xo, yo; |
| uint8_t u[9], v[9]; |
| |
| memset(u, ctx->chromakey_uv[0], sizeof(u)); |
| memset(v, ctx->chromakey_uv[1], sizeof(v)); |
| |
| for (y = slice_start; y < slice_end; ++y) { |
| for (x = 0; x < frame->width; ++x) { |
| for (yo = 0; yo < 3; ++yo) { |
| for (xo = 0; xo < 3; ++xo) { |
| get_pixel_uv(frame, ctx->hsub_log2, ctx->vsub_log2, x + xo - 1, y + yo - 1, &u[yo * 3 + xo], &v[yo * 3 + xo]); |
| } |
| } |
| |
| frame->data[3][frame->linesize[3] * y + x] = do_chromakey_pixel(ctx, u, v); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int filter_frame(AVFilterLink *link, AVFrame *frame) |
| { |
| AVFilterContext *avctx = link->dst; |
| int res; |
| |
| if (res = avctx->internal->execute(avctx, do_chromakey_slice, frame, NULL, FFMIN(frame->height, avctx->graph->nb_threads))) |
| return res; |
| |
| return ff_filter_frame(avctx->outputs[0], frame); |
| } |
| |
| #define FIXNUM(x) lrint((x) * (1 << 10)) |
| #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) |
| #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) |
| |
| static av_cold int initialize_chromakey(AVFilterContext *avctx) |
| { |
| ChromakeyContext *ctx = avctx->priv; |
| |
| if (ctx->is_yuv) { |
| ctx->chromakey_uv[0] = ctx->chromakey_rgba[1]; |
| ctx->chromakey_uv[1] = ctx->chromakey_rgba[2]; |
| } else { |
| ctx->chromakey_uv[0] = RGB_TO_U(ctx->chromakey_rgba); |
| ctx->chromakey_uv[1] = RGB_TO_V(ctx->chromakey_rgba); |
| } |
| |
| return 0; |
| } |
| |
| static av_cold int query_formats(AVFilterContext *avctx) |
| { |
| static const enum AVPixelFormat pixel_fmts[] = { |
| AV_PIX_FMT_YUVA420P, |
| AV_PIX_FMT_YUVA422P, |
| AV_PIX_FMT_YUVA444P, |
| 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 av_cold int config_input(AVFilterLink *inlink) |
| { |
| AVFilterContext *avctx = inlink->dst; |
| ChromakeyContext *ctx = avctx->priv; |
| const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); |
| |
| ctx->hsub_log2 = desc->log2_chroma_w; |
| ctx->vsub_log2 = desc->log2_chroma_h; |
| |
| return 0; |
| } |
| |
| static const AVFilterPad chromakey_inputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .needs_writable = 1, |
| .filter_frame = filter_frame, |
| .config_props = config_input, |
| }, |
| { NULL } |
| }; |
| |
| static const AVFilterPad chromakey_outputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| }, |
| { NULL } |
| }; |
| |
| #define OFFSET(x) offsetof(ChromakeyContext, x) |
| #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
| |
| static const AVOption chromakey_options[] = { |
| { "color", "set the chromakey key color", OFFSET(chromakey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS }, |
| { "similarity", "set the chromakey similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.01, 1.0, FLAGS }, |
| { "blend", "set the chromakey key blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS }, |
| { "yuv", "color parameter is in yuv instead of rgb", OFFSET(is_yuv), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS }, |
| { NULL } |
| }; |
| |
| AVFILTER_DEFINE_CLASS(chromakey); |
| |
| AVFilter ff_vf_chromakey = { |
| .name = "chromakey", |
| .description = NULL_IF_CONFIG_SMALL("Turns a certain color into transparency. Operates on YUV colors."), |
| .priv_size = sizeof(ChromakeyContext), |
| .priv_class = &chromakey_class, |
| .init = initialize_chromakey, |
| .query_formats = query_formats, |
| .inputs = chromakey_inputs, |
| .outputs = chromakey_outputs, |
| .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS, |
| }; |