mirror of
https://github.com/FFmpeg/FFmpeg.git
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219 lines
7.0 KiB
C
219 lines
7.0 KiB
C
/*
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* Copyright (c) 2017 Paul B Mahol
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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 LumakeyContext {
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const AVClass *class;
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double threshold;
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double tolerance;
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double softness;
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int white;
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int black;
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int so;
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int max;
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int (*do_lumakey_slice)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
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} LumakeyContext;
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static int do_lumakey_slice8(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
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{
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LumakeyContext *s = ctx->priv;
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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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uint8_t *alpha = frame->data[3] + slice_start * frame->linesize[3];
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const uint8_t *luma = frame->data[0] + slice_start * frame->linesize[0];
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const int so = s->so;
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const int w = s->white;
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const int b = s->black;
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int x, y;
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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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if (luma[x] >= b && luma[x] <= w) {
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alpha[x] = 0;
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} else if (luma[x] > b - so && luma[x] < w + so) {
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if (luma[x] < b) {
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alpha[x] = 255 - (luma[x] - b + so) * 255 / so;
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} else {
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alpha[x] = (luma[x] - w) * 255 / so;
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}
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}
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}
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luma += frame->linesize[0];
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alpha += frame->linesize[3];
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}
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return 0;
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}
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static int do_lumakey_slice16(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
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{
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LumakeyContext *s = ctx->priv;
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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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uint16_t *alpha = (uint16_t *)(frame->data[3] + slice_start * frame->linesize[3]);
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const uint16_t *luma = (const uint16_t *)(frame->data[0] + slice_start * frame->linesize[0]);
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const int so = s->so;
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const int w = s->white;
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const int b = s->black;
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const int m = s->max;
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int x, y;
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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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if (luma[x] >= b && luma[x] <= w) {
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alpha[x] = 0;
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} else if (luma[x] > b - so && luma[x] < w + so) {
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if (luma[x] < b) {
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alpha[x] = m - (luma[x] - b + so) * m / so;
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} else {
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alpha[x] = (luma[x] - w) * m / so;
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}
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}
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}
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luma += frame->linesize[0] / 2;
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alpha += frame->linesize[3] / 2;
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}
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return 0;
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}
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static int config_input(AVFilterLink *inlink)
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{
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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AVFilterContext *ctx = inlink->dst;
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LumakeyContext *s = ctx->priv;
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int depth;
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depth = desc->comp[0].depth;
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if (depth == 8) {
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s->white = av_clip_uint8((s->threshold + s->tolerance) * 255);
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s->black = av_clip_uint8((s->threshold - s->tolerance) * 255);
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s->do_lumakey_slice = do_lumakey_slice8;
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s->so = s->softness * 255;
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} else {
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s->max = (1 << depth) - 1;
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s->white = av_clip((s->threshold + s->tolerance) * s->max, 0, s->max);
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s->black = av_clip((s->threshold - s->tolerance) * s->max, 0, s->max);
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s->do_lumakey_slice = do_lumakey_slice16;
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s->so = s->softness * s->max;
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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 *ctx = link->dst;
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LumakeyContext *s = ctx->priv;
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int ret;
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if (ret = av_frame_make_writable(frame))
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return ret;
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if (ret = ctx->internal->execute(ctx, s->do_lumakey_slice, frame, NULL, FFMIN(frame->height, ff_filter_get_nb_threads(ctx))))
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return ret;
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return ff_filter_frame(ctx->outputs[0], frame);
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}
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static av_cold int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat pixel_fmts[] = {
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AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
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AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA420P9,
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AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA420P10,
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AV_PIX_FMT_YUVA444P12, AV_PIX_FMT_YUVA422P12,
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AV_PIX_FMT_YUVA444P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA420P16,
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AV_PIX_FMT_NONE
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};
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AVFilterFormats *formats;
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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(ctx, formats);
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}
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static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
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char *res, int res_len, int flags)
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{
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int ret;
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ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
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if (ret < 0)
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return ret;
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return config_input(ctx->inputs[0]);
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}
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static const AVFilterPad lumakey_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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.config_props = config_input,
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},
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{ NULL }
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};
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static const AVFilterPad lumakey_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(LumakeyContext, 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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static const AVOption lumakey_options[] = {
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{ "threshold", "set the threshold value", OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 1, FLAGS },
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{ "tolerance", "set the tolerance value", OFFSET(tolerance), AV_OPT_TYPE_DOUBLE, {.dbl=0.01}, 0, 1, FLAGS },
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{ "softness", "set the softness value", OFFSET(softness), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 1, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(lumakey);
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AVFilter ff_vf_lumakey = {
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.name = "lumakey",
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.description = NULL_IF_CONFIG_SMALL("Turns a certain luma into transparency."),
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.priv_size = sizeof(LumakeyContext),
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.priv_class = &lumakey_class,
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.query_formats = query_formats,
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.inputs = lumakey_inputs,
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.outputs = lumakey_outputs,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
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.process_command = process_command,
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};
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