/*
* Copyright (c) 2013 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 "drawutils.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
#define R 0
#define G 1
#define B 2
#define A 3
typedef struct {
double shadows;
double midtones;
double highlights;
} Range;
typedef struct {
const AVClass *class;
Range cyan_red;
Range magenta_green;
Range yellow_blue;
uint8_t lut[3][256];
uint8_t rgba_map[4];
int step;
} ColorBalanceContext;
#define OFFSET(x) offsetof(ColorBalanceContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption colorbalance_options[] = {
{ "rs", "set red shadows", OFFSET(cyan_red.shadows), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
{ "gs", "set green shadows", OFFSET(magenta_green.shadows), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
{ "bs", "set blue shadows", OFFSET(yellow_blue.shadows), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
{ "rm", "set red midtones", OFFSET(cyan_red.midtones), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
{ "gm", "set green midtones", OFFSET(magenta_green.midtones), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
{ "bm", "set blue midtones", OFFSET(yellow_blue.midtones), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
{ "rh", "set red highlights", OFFSET(cyan_red.highlights), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
{ "gh", "set green highlights", OFFSET(magenta_green.highlights), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
{ "bh", "set blue highlights", OFFSET(yellow_blue.highlights), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(colorbalance);
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA,
AV_PIX_FMT_ABGR, AV_PIX_FMT_ARGB,
AV_PIX_FMT_0BGR, AV_PIX_FMT_0RGB,
AV_PIX_FMT_RGB0, AV_PIX_FMT_BGR0,
AV_PIX_FMT_NONE
};
ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
return 0;
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
ColorBalanceContext *cb = ctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
double *shadows, *midtones, *highlights, *buffer;
int i, r, g, b;
buffer = av_malloc(256 * 3 * sizeof(*buffer));
if (!buffer)
return AVERROR(ENOMEM);
shadows = buffer + 256 * 0;
midtones = buffer + 256 * 1;
highlights = buffer + 256 * 2;
for (i = 0; i < 256; i++) {
double low = av_clipd((i - 85.0) / -64.0 + 0.5, 0, 1) * 178.5;
double mid = av_clipd((i - 85.0) / 64.0 + 0.5, 0, 1) *
av_clipd((i + 85.0 - 255.0) / -64.0 + 0.5, 0, 1) * 178.5;
shadows[i] = low;
midtones[i] = mid;
highlights[255 - i] = low;
}
for (i = 0; i < 256; i++) {
r = g = b = i;
r = av_clip_uint8(r + cb->cyan_red.shadows * shadows[r]);
r = av_clip_uint8(r + cb->cyan_red.midtones * midtones[r]);
r = av_clip_uint8(r + cb->cyan_red.highlights * highlights[r]);
g = av_clip_uint8(g + cb->magenta_green.shadows * shadows[g]);
g = av_clip_uint8(g + cb->magenta_green.midtones * midtones[g]);
g = av_clip_uint8(g + cb->magenta_green.highlights * highlights[g]);
b = av_clip_uint8(b + cb->yellow_blue.shadows * shadows[b]);
b = av_clip_uint8(b + cb->yellow_blue.midtones * midtones[b]);
b = av_clip_uint8(b + cb->yellow_blue.highlights * highlights[b]);
cb->lut[R][i] = r;
cb->lut[G][i] = g;
cb->lut[B][i] = b;
}
av_free(buffer);
ff_fill_rgba_map(cb->rgba_map, outlink->format);
cb->step = av_get_padded_bits_per_pixel(desc) >> 3;
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
ColorBalanceContext *cb = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
const uint8_t roffset = cb->rgba_map[R];
const uint8_t goffset = cb->rgba_map[G];
const uint8_t boffset = cb->rgba_map[B];
const uint8_t aoffset = cb->rgba_map[A];
const int step = cb->step;
const uint8_t *srcrow = in->data[0];
uint8_t *dstrow;
AVFrame *out;
int i, j;
if (av_frame_is_writable(in)) {
out = in;
} else {
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
av_frame_free(&in);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, in);
}
dstrow = out->data[0];
for (i = 0; i < outlink->h; i++) {
const uint8_t *src = srcrow;
uint8_t *dst = dstrow;
for (j = 0; j < outlink->w * step; j += step) {
dst[j + roffset] = cb->lut[R][src[j + roffset]];
dst[j + goffset] = cb->lut[G][src[j + goffset]];
dst[j + boffset] = cb->lut[B][src[j + boffset]];
if (in != out && step == 4)
dst[j + aoffset] = src[j + aoffset];
}
srcrow += in->linesize[0];
dstrow += out->linesize[0];
}
if (in != out)
av_frame_free(&in);
return ff_filter_frame(ctx->outputs[0], out);
}
static const AVFilterPad colorbalance_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad colorbalance_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
{ NULL }
};
AVFilter avfilter_vf_colorbalance = {
.name = "colorbalance",
.description = NULL_IF_CONFIG_SMALL("Adjust the color balance."),
.priv_size = sizeof(ColorBalanceContext),
.priv_class = &colorbalance_class,
.query_formats = query_formats,
.inputs = colorbalance_inputs,
.outputs = colorbalance_outputs,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
};