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/*
* Copyright (c) 2021 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 <float.h>
#include "libavutil/opt.h"
#include "libavutil/imgutils.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
typedef struct ColorCorrectContext {
const AVClass *class;
float rl, bl;
float rh, bh;
float saturation;
int depth;
int (*do_slice)(AVFilterContext *s, void *arg,
int jobnr, int nb_jobs);
} ColorCorrectContext;
#define PROCESS() \
float y = yptr[x] * imax; \
float u = uptr[x] * imax - .5f; \
float v = vptr[x] * imax - .5f; \
float ny, nu, nv; \
\
ny = y; \
nu = saturation * (u + y * bd + bl); \
nv = saturation * (v + y * rd + rl);
static int colorcorrect_slice8(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
ColorCorrectContext *s = ctx->priv;
AVFrame *frame = arg;
const int depth = s->depth;
const float max = (1 << depth) - 1;
const float imax = 1.f / max;
const int width = frame->width;
const int height = frame->height;
const int slice_start = (height * jobnr) / nb_jobs;
const int slice_end = (height * (jobnr + 1)) / nb_jobs;
const int ylinesize = frame->linesize[0];
const int ulinesize = frame->linesize[1];
const int vlinesize = frame->linesize[2];
uint8_t *yptr = frame->data[0] + slice_start * ylinesize;
uint8_t *uptr = frame->data[1] + slice_start * ulinesize;
uint8_t *vptr = frame->data[2] + slice_start * vlinesize;
const float saturation = s->saturation;
const float bl = s->bl;
const float rl = s->rl;
const float bd = s->bh - bl;
const float rd = s->rh - rl;
for (int y = slice_start; y < slice_end; y++) {
for (int x = 0; x < width; x++) {
PROCESS()
yptr[x] = av_clip_uint8( ny * max);
uptr[x] = av_clip_uint8((nu + 0.5f) * max);
vptr[x] = av_clip_uint8((nv + 0.5f) * max);
}
yptr += ylinesize;
uptr += ulinesize;
vptr += vlinesize;
}
return 0;
}
static int colorcorrect_slice16(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
ColorCorrectContext *s = ctx->priv;
AVFrame *frame = arg;
const int depth = s->depth;
const float max = (1 << depth) - 1;
const float imax = 1.f / max;
const int width = frame->width;
const int height = frame->height;
const int slice_start = (height * jobnr) / nb_jobs;
const int slice_end = (height * (jobnr + 1)) / nb_jobs;
const int ylinesize = frame->linesize[0] / 2;
const int ulinesize = frame->linesize[1] / 2;
const int vlinesize = frame->linesize[2] / 2;
uint16_t *yptr = (uint16_t *)frame->data[0] + slice_start * ylinesize;
uint16_t *uptr = (uint16_t *)frame->data[1] + slice_start * ulinesize;
uint16_t *vptr = (uint16_t *)frame->data[2] + slice_start * vlinesize;
const float saturation = s->saturation;
const float bl = s->bl;
const float rl = s->rl;
const float bd = s->bh - bl;
const float rd = s->rh - rl;
for (int y = slice_start; y < slice_end; y++) {
for (int x = 0; x < width; x++) {
PROCESS()
yptr[x] = av_clip_uintp2_c( ny * max, depth);
uptr[x] = av_clip_uintp2_c((nu + 0.5f) * max, depth);
vptr[x] = av_clip_uintp2_c((nv + 0.5f) * max, depth);
}
yptr += ylinesize;
uptr += ulinesize;
vptr += vlinesize;
}
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
AVFilterContext *ctx = inlink->dst;
ColorCorrectContext *s = ctx->priv;
ctx->internal->execute(ctx, s->do_slice, frame, NULL,
FFMIN(frame->height, ff_filter_get_nb_threads(ctx)));
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_YUV444P, AV_PIX_FMT_YUVJ444P,
AV_PIX_FMT_YUV444P9, AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV444P16,
AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12, AV_PIX_FMT_YUVA444P16,
AV_PIX_FMT_NONE
};
AVFilterFormats *formats = NULL;
formats = ff_make_format_list(pixel_fmts);
if (!formats)
return AVERROR(ENOMEM);
return ff_set_common_formats(ctx, formats);
}
static av_cold int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
ColorCorrectContext *s = ctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
s->depth = desc->comp[0].depth;
s->do_slice = s->depth <= 8 ? colorcorrect_slice8 : colorcorrect_slice16;
return 0;
}
static const AVFilterPad colorcorrect_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.needs_writable = 1,
.filter_frame = filter_frame,
.config_props = config_input,
},
{ NULL }
};
static const AVFilterPad colorcorrect_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
#define OFFSET(x) offsetof(ColorCorrectContext, x)
#define VF AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption colorcorrect_options[] = {
{ "rl", "set the red shadow spot", OFFSET(rl), AV_OPT_TYPE_FLOAT, {.dbl=0}, -1, 1, VF },
{ "bl", "set the blue shadow spot", OFFSET(bl), AV_OPT_TYPE_FLOAT, {.dbl=0}, -1, 1, VF },
{ "rh", "set the red highlight spot", OFFSET(rh), AV_OPT_TYPE_FLOAT, {.dbl=0}, -1, 1, VF },
{ "bh", "set the blue highlight spot", OFFSET(bh), AV_OPT_TYPE_FLOAT, {.dbl=0}, -1, 1, VF },
{ "saturation", "set the amount of saturation", OFFSET(saturation), AV_OPT_TYPE_FLOAT, {.dbl=1}, -3, 3, VF },
{ NULL }
};
AVFILTER_DEFINE_CLASS(colorcorrect);
AVFilter ff_vf_colorcorrect = {
.name = "colorcorrect",
.description = NULL_IF_CONFIG_SMALL("Adjust color white balance selectively for blacks and whites."),
.priv_size = sizeof(ColorCorrectContext),
.priv_class = &colorcorrect_class,
.query_formats = query_formats,
.inputs = colorcorrect_inputs,
.outputs = colorcorrect_outputs,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
.process_command = ff_filter_process_command,
};