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path: root/libavfilter/vf_colorbalance.c (plain)
blob: e37f1995cacaab4c73c42955e13dcae74bf0ee28
1/*
2 * Copyright (c) 2013 Paul B Mahol
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21#include "libavutil/opt.h"
22#include "libavutil/pixdesc.h"
23#include "avfilter.h"
24#include "drawutils.h"
25#include "formats.h"
26#include "internal.h"
27#include "video.h"
28
29#define R 0
30#define G 1
31#define B 2
32#define A 3
33
34typedef struct {
35 double shadows;
36 double midtones;
37 double highlights;
38} Range;
39
40typedef struct {
41 const AVClass *class;
42 Range cyan_red;
43 Range magenta_green;
44 Range yellow_blue;
45
46 uint8_t lut[3][256];
47
48 uint8_t rgba_map[4];
49 int step;
50} ColorBalanceContext;
51
52#define OFFSET(x) offsetof(ColorBalanceContext, x)
53#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
54static const AVOption colorbalance_options[] = {
55 { "rs", "set red shadows", OFFSET(cyan_red.shadows), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
56 { "gs", "set green shadows", OFFSET(magenta_green.shadows), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
57 { "bs", "set blue shadows", OFFSET(yellow_blue.shadows), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
58 { "rm", "set red midtones", OFFSET(cyan_red.midtones), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
59 { "gm", "set green midtones", OFFSET(magenta_green.midtones), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
60 { "bm", "set blue midtones", OFFSET(yellow_blue.midtones), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
61 { "rh", "set red highlights", OFFSET(cyan_red.highlights), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
62 { "gh", "set green highlights", OFFSET(magenta_green.highlights), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
63 { "bh", "set blue highlights", OFFSET(yellow_blue.highlights), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
64 { NULL }
65};
66
67AVFILTER_DEFINE_CLASS(colorbalance);
68
69static int query_formats(AVFilterContext *ctx)
70{
71 static const enum AVPixelFormat pix_fmts[] = {
72 AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
73 AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA,
74 AV_PIX_FMT_ABGR, AV_PIX_FMT_ARGB,
75 AV_PIX_FMT_0BGR, AV_PIX_FMT_0RGB,
76 AV_PIX_FMT_RGB0, AV_PIX_FMT_BGR0,
77 AV_PIX_FMT_NONE
78 };
79 AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
80 if (!fmts_list)
81 return AVERROR(ENOMEM);
82 return ff_set_common_formats(ctx, fmts_list);
83}
84
85static int config_output(AVFilterLink *outlink)
86{
87 AVFilterContext *ctx = outlink->src;
88 ColorBalanceContext *s = ctx->priv;
89 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
90 double *shadows, *midtones, *highlights, *buffer;
91 int i, r, g, b;
92
93 buffer = av_malloc(256 * 3 * sizeof(*buffer));
94 if (!buffer)
95 return AVERROR(ENOMEM);
96
97 shadows = buffer + 256 * 0;
98 midtones = buffer + 256 * 1;
99 highlights = buffer + 256 * 2;
100
101 for (i = 0; i < 256; i++) {
102 double low = av_clipd((i - 85.0) / -64.0 + 0.5, 0, 1) * 178.5;
103 double mid = av_clipd((i - 85.0) / 64.0 + 0.5, 0, 1) *
104 av_clipd((i + 85.0 - 255.0) / -64.0 + 0.5, 0, 1) * 178.5;
105
106 shadows[i] = low;
107 midtones[i] = mid;
108 highlights[255 - i] = low;
109 }
110
111 for (i = 0; i < 256; i++) {
112 r = g = b = i;
113
114 r = av_clip_uint8(r + s->cyan_red.shadows * shadows[r]);
115 r = av_clip_uint8(r + s->cyan_red.midtones * midtones[r]);
116 r = av_clip_uint8(r + s->cyan_red.highlights * highlights[r]);
117
118 g = av_clip_uint8(g + s->magenta_green.shadows * shadows[g]);
119 g = av_clip_uint8(g + s->magenta_green.midtones * midtones[g]);
120 g = av_clip_uint8(g + s->magenta_green.highlights * highlights[g]);
121
122 b = av_clip_uint8(b + s->yellow_blue.shadows * shadows[b]);
123 b = av_clip_uint8(b + s->yellow_blue.midtones * midtones[b]);
124 b = av_clip_uint8(b + s->yellow_blue.highlights * highlights[b]);
125
126 s->lut[R][i] = r;
127 s->lut[G][i] = g;
128 s->lut[B][i] = b;
129 }
130
131 av_free(buffer);
132
133 ff_fill_rgba_map(s->rgba_map, outlink->format);
134 s->step = av_get_padded_bits_per_pixel(desc) >> 3;
135
136 return 0;
137}
138
139static int filter_frame(AVFilterLink *inlink, AVFrame *in)
140{
141 AVFilterContext *ctx = inlink->dst;
142 ColorBalanceContext *s = ctx->priv;
143 AVFilterLink *outlink = ctx->outputs[0];
144 const uint8_t roffset = s->rgba_map[R];
145 const uint8_t goffset = s->rgba_map[G];
146 const uint8_t boffset = s->rgba_map[B];
147 const uint8_t aoffset = s->rgba_map[A];
148 const int step = s->step;
149 const uint8_t *srcrow = in->data[0];
150 uint8_t *dstrow;
151 AVFrame *out;
152 int i, j;
153
154 if (av_frame_is_writable(in)) {
155 out = in;
156 } else {
157 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
158 if (!out) {
159 av_frame_free(&in);
160 return AVERROR(ENOMEM);
161 }
162 av_frame_copy_props(out, in);
163 }
164
165 dstrow = out->data[0];
166 for (i = 0; i < outlink->h; i++) {
167 const uint8_t *src = srcrow;
168 uint8_t *dst = dstrow;
169
170 for (j = 0; j < outlink->w * step; j += step) {
171 dst[j + roffset] = s->lut[R][src[j + roffset]];
172 dst[j + goffset] = s->lut[G][src[j + goffset]];
173 dst[j + boffset] = s->lut[B][src[j + boffset]];
174 if (in != out && step == 4)
175 dst[j + aoffset] = src[j + aoffset];
176 }
177
178 srcrow += in->linesize[0];
179 dstrow += out->linesize[0];
180 }
181
182 if (in != out)
183 av_frame_free(&in);
184 return ff_filter_frame(ctx->outputs[0], out);
185}
186
187static const AVFilterPad colorbalance_inputs[] = {
188 {
189 .name = "default",
190 .type = AVMEDIA_TYPE_VIDEO,
191 .filter_frame = filter_frame,
192 },
193 { NULL }
194};
195
196static const AVFilterPad colorbalance_outputs[] = {
197 {
198 .name = "default",
199 .type = AVMEDIA_TYPE_VIDEO,
200 .config_props = config_output,
201 },
202 { NULL }
203};
204
205AVFilter ff_vf_colorbalance = {
206 .name = "colorbalance",
207 .description = NULL_IF_CONFIG_SMALL("Adjust the color balance."),
208 .priv_size = sizeof(ColorBalanceContext),
209 .priv_class = &colorbalance_class,
210 .query_formats = query_formats,
211 .inputs = colorbalance_inputs,
212 .outputs = colorbalance_outputs,
213 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
214};
215
generated by cgit at 2024-05-17 05:05:26 (GMT)