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/*
* 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/pixdesc.h"
#include "avfilter.h"
#include "internal.h"
#include "video.h"
typedef struct LumakeyContext {
const AVClass *class;
double threshold;
double tolerance;
double softness;
int white;
int black;
int so;
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->so;
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->so;
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) * 255);
s->black = av_clip_uint8((s->threshold - s->tolerance) * 255);
s->do_lumakey_slice = do_lumakey_slice8;
s->so = s->softness * 255;
} else {
s->max = (1 << depth) - 1;
s->white = av_clip((s->threshold + s->tolerance) * s->max, 0, s->max);
s->black = av_clip((s->threshold - s->tolerance) * s->max, 0, s->max);
s->do_lumakey_slice = do_lumakey_slice16;
s->so = s->softness * s->max;
}
return 0;
}
static int filter_frame(AVFilterLink *link, AVFrame *frame)
{
AVFilterContext *ctx = link->dst;
LumakeyContext *s = ctx->priv;
int ret;
if (ret = ff_filter_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 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_YUVA444P12, AV_PIX_FMT_YUVA422P12,
AV_PIX_FMT_YUVA444P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA420P16,
AV_PIX_FMT_NONE
};
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
char *res, int res_len, int flags)
{
int ret;
ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
if (ret < 0)
return ret;
return config_input(ctx->inputs[0]);
}
static const AVFilterPad lumakey_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
.filter_frame = filter_frame,
.config_props = config_input,
},
};
#define OFFSET(x) offsetof(LumakeyContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption lumakey_options[] = {
{ "threshold", "set the threshold value", OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 1, FLAGS },
{ "tolerance", "set the tolerance value", OFFSET(tolerance), AV_OPT_TYPE_DOUBLE, {.dbl=0.01}, 0, 1, FLAGS },
{ "softness", "set the softness value", OFFSET(softness), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 1, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(lumakey);
const 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,
FILTER_INPUTS(lumakey_inputs),
FILTER_OUTPUTS(ff_video_default_filterpad),
FILTER_PIXFMTS_ARRAY(pixel_fmts),
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
.process_command = process_command,
};
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