/* * Copyright (c) 2017 Paul B Mahol * * 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 LumakeyContext { const AVClass *class; int threshold; int tolerance; int softness; int white; int black; int max; int (*do_lumakey_slice)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs); } LumakeyContext; static int do_lumakey_slice8(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) { LumakeyContext *s = ctx->priv; AVFrame *frame = arg; const int slice_start = (frame->height * jobnr) / nb_jobs; const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs; uint8_t *alpha = frame->data[3] + slice_start * frame->linesize[3]; const uint8_t *luma = frame->data[0] + slice_start * frame->linesize[0]; const int so = s->softness; const int w = s->white; const int b = s->black; int x, y; for (y = slice_start; y < slice_end; y++) { for (x = 0; x < frame->width; x++) { if (luma[x] >= b && luma[x] <= w) { alpha[x] = 0; } else if (luma[x] > b - so && luma[x] < w + so) { if (luma[x] < b) { alpha[x] = 255 - (luma[x] - b + so) * 255 / so; } else { alpha[x] = (luma[x] - w) * 255 / so; } } } luma += frame->linesize[0]; alpha += frame->linesize[3]; } return 0; } static int do_lumakey_slice16(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) { LumakeyContext *s = ctx->priv; AVFrame *frame = arg; const int slice_start = (frame->height * jobnr) / nb_jobs; const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs; uint16_t *alpha = (uint16_t *)(frame->data[3] + slice_start * frame->linesize[3]); const uint16_t *luma = (const uint16_t *)(frame->data[0] + slice_start * frame->linesize[0]); const int so = s->softness; const int w = s->white; const int b = s->black; const int m = s->max; int x, y; for (y = slice_start; y < slice_end; y++) { for (x = 0; x < frame->width; x++) { if (luma[x] >= b && luma[x] <= w) { alpha[x] = 0; } else if (luma[x] > b - so && luma[x] < w + so) { if (luma[x] < b) { alpha[x] = m - (luma[x] - b + so) * m / so; } else { alpha[x] = (luma[x] - w) * m / so; } } } luma += frame->linesize[0] / 2; alpha += frame->linesize[3] / 2; } return 0; } static int config_input(AVFilterLink *inlink) { const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); AVFilterContext *ctx = inlink->dst; LumakeyContext *s = ctx->priv; int depth; depth = desc->comp[0].depth; if (depth == 8) { s->white = av_clip_uint8(s->threshold + s->tolerance); s->black = av_clip_uint8(s->threshold - s->tolerance); s->do_lumakey_slice = do_lumakey_slice8; } else { s->max = (1 << depth) - 1; s->white = av_clip(s->threshold + s->tolerance, 0, s->max); s->black = av_clip(s->threshold - s->tolerance, 0, s->max); s->do_lumakey_slice = do_lumakey_slice16; } return 0; } static int filter_frame(AVFilterLink *link, AVFrame *frame) { AVFilterContext *ctx = link->dst; LumakeyContext *s = ctx->priv; int ret; if (ret = av_frame_make_writable(frame)) return ret; if (ret = ctx->internal->execute(ctx, s->do_lumakey_slice, frame, NULL, FFMIN(frame->height, ff_filter_get_nb_threads(ctx)))) return ret; return ff_filter_frame(ctx->outputs[0], frame); } static av_cold int query_formats(AVFilterContext *ctx) { static const enum AVPixelFormat pixel_fmts[] = { AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA444P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_NONE }; AVFilterFormats *formats; formats = ff_make_format_list(pixel_fmts); if (!formats) return AVERROR(ENOMEM); return ff_set_common_formats(ctx, formats); } static const AVFilterPad lumakey_inputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, .filter_frame = filter_frame, .config_props = config_input, }, { NULL } }; static const AVFilterPad lumakey_outputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, }, { NULL } }; #define OFFSET(x) offsetof(LumakeyContext, x) #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM static const AVOption lumakey_options[] = { { "threshold", "set the threshold value", OFFSET(threshold), AV_OPT_TYPE_INT, {.i64=0}, 0, UINT16_MAX, FLAGS }, { "tolerance", "set the tolerance value", OFFSET(tolerance), AV_OPT_TYPE_INT, {.i64=1}, 0, UINT16_MAX, FLAGS }, { "softness", "set the softness value", OFFSET(softness), AV_OPT_TYPE_INT, {.i64=0}, 0, UINT16_MAX, FLAGS }, { NULL } }; AVFILTER_DEFINE_CLASS(lumakey); AVFilter ff_vf_lumakey = { .name = "lumakey", .description = NULL_IF_CONFIG_SMALL("Turns a certain luma into transparency."), .priv_size = sizeof(LumakeyContext), .priv_class = &lumakey_class, .query_formats = query_formats, .inputs = lumakey_inputs, .outputs = lumakey_outputs, .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS, };