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path: root/libavfilter/vf_colorlevels.c (plain)
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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/imgutils.h"
22#include "libavutil/opt.h"
23#include "libavutil/pixdesc.h"
24#include "avfilter.h"
25#include "drawutils.h"
26#include "formats.h"
27#include "internal.h"
28#include "video.h"
29
30#define R 0
31#define G 1
32#define B 2
33#define A 3
34
35typedef struct {
36 double in_min, in_max;
37 double out_min, out_max;
38} Range;
39
40typedef struct {
41 const AVClass *class;
42 Range range[4];
43 int nb_comp;
44 int bpp;
45 int step;
46 uint8_t rgba_map[4];
47 int linesize;
48} ColorLevelsContext;
49
50#define OFFSET(x) offsetof(ColorLevelsContext, x)
51#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
52static const AVOption colorlevels_options[] = {
53 { "rimin", "set input red black point", OFFSET(range[R].in_min), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
54 { "gimin", "set input green black point", OFFSET(range[G].in_min), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
55 { "bimin", "set input blue black point", OFFSET(range[B].in_min), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
56 { "aimin", "set input alpha black point", OFFSET(range[A].in_min), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
57 { "rimax", "set input red white point", OFFSET(range[R].in_max), AV_OPT_TYPE_DOUBLE, {.dbl=1}, -1, 1, FLAGS },
58 { "gimax", "set input green white point", OFFSET(range[G].in_max), AV_OPT_TYPE_DOUBLE, {.dbl=1}, -1, 1, FLAGS },
59 { "bimax", "set input blue white point", OFFSET(range[B].in_max), AV_OPT_TYPE_DOUBLE, {.dbl=1}, -1, 1, FLAGS },
60 { "aimax", "set input alpha white point", OFFSET(range[A].in_max), AV_OPT_TYPE_DOUBLE, {.dbl=1}, -1, 1, FLAGS },
61 { "romin", "set output red black point", OFFSET(range[R].out_min), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 1, FLAGS },
62 { "gomin", "set output green black point", OFFSET(range[G].out_min), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 1, FLAGS },
63 { "bomin", "set output blue black point", OFFSET(range[B].out_min), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 1, FLAGS },
64 { "aomin", "set output alpha black point", OFFSET(range[A].out_min), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 1, FLAGS },
65 { "romax", "set output red white point", OFFSET(range[R].out_max), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },
66 { "gomax", "set output green white point", OFFSET(range[G].out_max), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },
67 { "bomax", "set output blue white point", OFFSET(range[B].out_max), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },
68 { "aomax", "set output alpha white point", OFFSET(range[A].out_max), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },
69 { NULL }
70};
71
72AVFILTER_DEFINE_CLASS(colorlevels);
73
74static int query_formats(AVFilterContext *ctx)
75{
76 static const enum AVPixelFormat pix_fmts[] = {
77 AV_PIX_FMT_0RGB, AV_PIX_FMT_0BGR,
78 AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR,
79 AV_PIX_FMT_RGB0, AV_PIX_FMT_BGR0,
80 AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
81 AV_PIX_FMT_RGB48, AV_PIX_FMT_BGR48,
82 AV_PIX_FMT_RGBA64, AV_PIX_FMT_BGRA64,
83 AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA,
84 AV_PIX_FMT_NONE
85 };
86
87 AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
88 if (!fmts_list)
89 return AVERROR(ENOMEM);
90 return ff_set_common_formats(ctx, fmts_list);
91}
92
93static int config_input(AVFilterLink *inlink)
94{
95 AVFilterContext *ctx = inlink->dst;
96 ColorLevelsContext *s = ctx->priv;
97 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
98
99 s->nb_comp = desc->nb_components;
100 s->bpp = desc->comp[0].depth >> 3;
101 s->step = (av_get_padded_bits_per_pixel(desc) >> 3) / s->bpp;
102 s->linesize = inlink->w * s->step;
103 ff_fill_rgba_map(s->rgba_map, inlink->format);
104
105 return 0;
106}
107
108static int filter_frame(AVFilterLink *inlink, AVFrame *in)
109{
110 AVFilterContext *ctx = inlink->dst;
111 ColorLevelsContext *s = ctx->priv;
112 AVFilterLink *outlink = ctx->outputs[0];
113 const int step = s->step;
114 AVFrame *out;
115 int x, y, i;
116
117 if (av_frame_is_writable(in)) {
118 out = in;
119 } else {
120 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
121 if (!out) {
122 av_frame_free(&in);
123 return AVERROR(ENOMEM);
124 }
125 av_frame_copy_props(out, in);
126 }
127
128 switch (s->bpp) {
129 case 1:
130 for (i = 0; i < s->nb_comp; i++) {
131 Range *r = &s->range[i];
132 const uint8_t offset = s->rgba_map[i];
133 const uint8_t *srcrow = in->data[0];
134 uint8_t *dstrow = out->data[0];
135 int imin = lrint(r->in_min * UINT8_MAX);
136 int imax = lrint(r->in_max * UINT8_MAX);
137 int omin = lrint(r->out_min * UINT8_MAX);
138 int omax = lrint(r->out_max * UINT8_MAX);
139 double coeff;
140
141 if (imin < 0) {
142 imin = UINT8_MAX;
143 for (y = 0; y < inlink->h; y++) {
144 const uint8_t *src = srcrow;
145
146 for (x = 0; x < s->linesize; x += step)
147 imin = FFMIN(imin, src[x + offset]);
148 srcrow += in->linesize[0];
149 }
150 }
151 if (imax < 0) {
152 srcrow = in->data[0];
153 imax = 0;
154 for (y = 0; y < inlink->h; y++) {
155 const uint8_t *src = srcrow;
156
157 for (x = 0; x < s->linesize; x += step)
158 imax = FFMAX(imax, src[x + offset]);
159 srcrow += in->linesize[0];
160 }
161 }
162
163 srcrow = in->data[0];
164 coeff = (omax - omin) / (double)(imax - imin);
165 for (y = 0; y < inlink->h; y++) {
166 const uint8_t *src = srcrow;
167 uint8_t *dst = dstrow;
168
169 for (x = 0; x < s->linesize; x += step)
170 dst[x + offset] = av_clip_uint8((src[x + offset] - imin) * coeff + omin);
171 dstrow += out->linesize[0];
172 srcrow += in->linesize[0];
173 }
174 }
175 break;
176 case 2:
177 for (i = 0; i < s->nb_comp; i++) {
178 Range *r = &s->range[i];
179 const uint8_t offset = s->rgba_map[i];
180 const uint8_t *srcrow = in->data[0];
181 uint8_t *dstrow = out->data[0];
182 int imin = lrint(r->in_min * UINT16_MAX);
183 int imax = lrint(r->in_max * UINT16_MAX);
184 int omin = lrint(r->out_min * UINT16_MAX);
185 int omax = lrint(r->out_max * UINT16_MAX);
186 double coeff;
187
188 if (imin < 0) {
189 imin = UINT16_MAX;
190 for (y = 0; y < inlink->h; y++) {
191 const uint16_t *src = (const uint16_t *)srcrow;
192
193 for (x = 0; x < s->linesize; x += step)
194 imin = FFMIN(imin, src[x + offset]);
195 srcrow += in->linesize[0];
196 }
197 }
198 if (imax < 0) {
199 srcrow = in->data[0];
200 imax = 0;
201 for (y = 0; y < inlink->h; y++) {
202 const uint16_t *src = (const uint16_t *)srcrow;
203
204 for (x = 0; x < s->linesize; x += step)
205 imax = FFMAX(imax, src[x + offset]);
206 srcrow += in->linesize[0];
207 }
208 }
209
210 srcrow = in->data[0];
211 coeff = (omax - omin) / (double)(imax - imin);
212 for (y = 0; y < inlink->h; y++) {
213 const uint16_t *src = (const uint16_t*)srcrow;
214 uint16_t *dst = (uint16_t *)dstrow;
215
216 for (x = 0; x < s->linesize; x += step)
217 dst[x + offset] = av_clip_uint16((src[x + offset] - imin) * coeff + omin);
218 dstrow += out->linesize[0];
219 srcrow += in->linesize[0];
220 }
221 }
222 }
223
224 if (in != out)
225 av_frame_free(&in);
226 return ff_filter_frame(outlink, out);
227}
228
229static const AVFilterPad colorlevels_inputs[] = {
230 {
231 .name = "default",
232 .type = AVMEDIA_TYPE_VIDEO,
233 .filter_frame = filter_frame,
234 .config_props = config_input,
235 },
236 { NULL }
237};
238
239static const AVFilterPad colorlevels_outputs[] = {
240 {
241 .name = "default",
242 .type = AVMEDIA_TYPE_VIDEO,
243 },
244 { NULL }
245};
246
247AVFilter ff_vf_colorlevels = {
248 .name = "colorlevels",
249 .description = NULL_IF_CONFIG_SMALL("Adjust the color levels."),
250 .priv_size = sizeof(ColorLevelsContext),
251 .priv_class = &colorlevels_class,
252 .query_formats = query_formats,
253 .inputs = colorlevels_inputs,
254 .outputs = colorlevels_outputs,
255 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
256};
257
generated by cgit at 2024-05-17 06:59:50 (GMT)