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/*
* Copyright (c) 2018 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 VibranceContext {
const AVClass *class;
float intensity;
float balance[3];
float lcoeffs[3];
int alternate;
int depth;
int (*do_slice)(AVFilterContext *s, void *arg,
int jobnr, int nb_jobs);
} VibranceContext;
static inline float lerpf(float v0, float v1, float f)
{
return v0 + (v1 - v0) * f;
}
static int vibrance_slice8(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
{
VibranceContext *s = avctx->priv;
AVFrame *frame = arg;
const int width = frame->width;
const int height = frame->height;
const float scale = 1.f / 255.f;
const float gc = s->lcoeffs[0];
const float bc = s->lcoeffs[1];
const float rc = s->lcoeffs[2];
const float intensity = s->intensity;
const float alternate = s->alternate ? 1.f : -1.f;
const float gintensity = intensity * s->balance[0];
const float bintensity = intensity * s->balance[1];
const float rintensity = intensity * s->balance[2];
const float sgintensity = alternate * FFSIGN(gintensity);
const float sbintensity = alternate * FFSIGN(bintensity);
const float srintensity = alternate * FFSIGN(rintensity);
const int slice_start = (height * jobnr) / nb_jobs;
const int slice_end = (height * (jobnr + 1)) / nb_jobs;
const int glinesize = frame->linesize[0];
const int blinesize = frame->linesize[1];
const int rlinesize = frame->linesize[2];
uint8_t *gptr = frame->data[0] + slice_start * glinesize;
uint8_t *bptr = frame->data[1] + slice_start * blinesize;
uint8_t *rptr = frame->data[2] + slice_start * rlinesize;
for (int y = slice_start; y < slice_end; y++) {
for (int x = 0; x < width; x++) {
float g = gptr[x] * scale;
float b = bptr[x] * scale;
float r = rptr[x] * scale;
float max_color = FFMAX3(r, g, b);
float min_color = FFMIN3(r, g, b);
float color_saturation = max_color - min_color;
float luma = g * gc + r * rc + b * bc;
const float cg = 1.f + gintensity * (1.f - sgintensity * color_saturation);
const float cb = 1.f + bintensity * (1.f - sbintensity * color_saturation);
const float cr = 1.f + rintensity * (1.f - srintensity * color_saturation);
g = lerpf(luma, g, cg);
b = lerpf(luma, b, cb);
r = lerpf(luma, r, cr);
gptr[x] = av_clip_uint8(g * 255.f);
bptr[x] = av_clip_uint8(b * 255.f);
rptr[x] = av_clip_uint8(r * 255.f);
}
gptr += glinesize;
bptr += blinesize;
rptr += rlinesize;
}
return 0;
}
static int vibrance_slice16(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
{
VibranceContext *s = avctx->priv;
AVFrame *frame = arg;
const int depth = s->depth;
const float max = (1 << depth) - 1;
const float scale = 1.f / max;
const float gc = s->lcoeffs[0];
const float bc = s->lcoeffs[1];
const float rc = s->lcoeffs[2];
const int width = frame->width;
const int height = frame->height;
const float intensity = s->intensity;
const float alternate = s->alternate ? 1.f : -1.f;
const float gintensity = intensity * s->balance[0];
const float bintensity = intensity * s->balance[1];
const float rintensity = intensity * s->balance[2];
const float sgintensity = alternate * FFSIGN(gintensity);
const float sbintensity = alternate * FFSIGN(bintensity);
const float srintensity = alternate * FFSIGN(rintensity);
const int slice_start = (height * jobnr) / nb_jobs;
const int slice_end = (height * (jobnr + 1)) / nb_jobs;
const int glinesize = frame->linesize[0] / 2;
const int blinesize = frame->linesize[1] / 2;
const int rlinesize = frame->linesize[2] / 2;
uint16_t *gptr = (uint16_t *)frame->data[0] + slice_start * glinesize;
uint16_t *bptr = (uint16_t *)frame->data[1] + slice_start * blinesize;
uint16_t *rptr = (uint16_t *)frame->data[2] + slice_start * rlinesize;
for (int y = slice_start; y < slice_end; y++) {
for (int x = 0; x < width; x++) {
float g = gptr[x] * scale;
float b = bptr[x] * scale;
float r = rptr[x] * scale;
float max_color = FFMAX3(r, g, b);
float min_color = FFMIN3(r, g, b);
float color_saturation = max_color - min_color;
float luma = g * gc + r * rc + b * bc;
const float cg = 1.f + gintensity * (1.f - sgintensity * color_saturation);
const float cb = 1.f + bintensity * (1.f - sbintensity * color_saturation);
const float cr = 1.f + rintensity * (1.f - srintensity * color_saturation);
g = lerpf(luma, g, cg);
b = lerpf(luma, b, cb);
r = lerpf(luma, r, cr);
gptr[x] = av_clip_uintp2_c(g * max, depth);
bptr[x] = av_clip_uintp2_c(b * max, depth);
rptr[x] = av_clip_uintp2_c(r * max, depth);
}
gptr += glinesize;
bptr += blinesize;
rptr += rlinesize;
}
return 0;
}
static int filter_frame(AVFilterLink *link, AVFrame *frame)
{
AVFilterContext *avctx = link->dst;
VibranceContext *s = avctx->priv;
int res;
if (res = avctx->internal->execute(avctx, s->do_slice, frame, NULL,
FFMIN(frame->height, ff_filter_get_nb_threads(avctx))))
return res;
return ff_filter_frame(avctx->outputs[0], frame);
}
static av_cold int query_formats(AVFilterContext *avctx)
{
static const enum AVPixelFormat pixel_fmts[] = {
AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRP12,
AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
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;
VibranceContext *s = avctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
s->depth = desc->comp[0].depth;
s->do_slice = s->depth <= 8 ? vibrance_slice8 : vibrance_slice16;
return 0;
}
static const AVFilterPad vibrance_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.needs_writable = 1,
.filter_frame = filter_frame,
.config_props = config_input,
},
{ NULL }
};
static const AVFilterPad vibrance_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
#define OFFSET(x) offsetof(VibranceContext, x)
#define VF AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption vibrance_options[] = {
{ "intensity", "set the intensity value", OFFSET(intensity), AV_OPT_TYPE_FLOAT, {.dbl=0}, -2, 2, VF },
{ "rbal", "set the red balance value", OFFSET(balance[2]), AV_OPT_TYPE_FLOAT, {.dbl=1}, -10, 10, VF },
{ "gbal", "set the green balance value", OFFSET(balance[0]), AV_OPT_TYPE_FLOAT, {.dbl=1}, -10, 10, VF },
{ "bbal", "set the blue balance value", OFFSET(balance[1]), AV_OPT_TYPE_FLOAT, {.dbl=1}, -10, 10, VF },
{ "rlum", "set the red luma coefficient", OFFSET(lcoeffs[2]), AV_OPT_TYPE_FLOAT, {.dbl=0.072186}, 0, 1, VF },
{ "glum", "set the green luma coefficient", OFFSET(lcoeffs[0]), AV_OPT_TYPE_FLOAT, {.dbl=0.715158}, 0, 1, VF },
{ "blum", "set the blue luma coefficient", OFFSET(lcoeffs[1]), AV_OPT_TYPE_FLOAT, {.dbl=0.212656}, 0, 1, VF },
{ "alternate", "use alternate colors", OFFSET(alternate), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, VF },
{ NULL }
};
AVFILTER_DEFINE_CLASS(vibrance);
AVFilter ff_vf_vibrance = {
.name = "vibrance",
.description = NULL_IF_CONFIG_SMALL("Boost or alter saturation."),
.priv_size = sizeof(VibranceContext),
.priv_class = &vibrance_class,
.query_formats = query_formats,
.inputs = vibrance_inputs,
.outputs = vibrance_outputs,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
};
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