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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/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 | ||
34 | typedef struct { | |
35 | double shadows; | |
36 | double midtones; | |
37 | double highlights; | |
38 | } Range; | |
39 | ||
40 | typedef 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 | |
54 | static 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 | ||
67 | AVFILTER_DEFINE_CLASS(colorbalance); | |
68 | ||
69 | static 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 | ||
80 | ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); | |
81 | return 0; | |
82 | } | |
83 | ||
84 | static int config_output(AVFilterLink *outlink) | |
85 | { | |
86 | AVFilterContext *ctx = outlink->src; | |
87 | ColorBalanceContext *cb = ctx->priv; | |
88 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format); | |
89 | double *shadows, *midtones, *highlights, *buffer; | |
90 | int i, r, g, b; | |
91 | ||
92 | buffer = av_malloc(256 * 3 * sizeof(*buffer)); | |
93 | if (!buffer) | |
94 | return AVERROR(ENOMEM); | |
95 | ||
96 | shadows = buffer + 256 * 0; | |
97 | midtones = buffer + 256 * 1; | |
98 | highlights = buffer + 256 * 2; | |
99 | ||
100 | for (i = 0; i < 256; i++) { | |
101 | double low = av_clipd((i - 85.0) / -64.0 + 0.5, 0, 1) * 178.5; | |
102 | double mid = av_clipd((i - 85.0) / 64.0 + 0.5, 0, 1) * | |
103 | av_clipd((i + 85.0 - 255.0) / -64.0 + 0.5, 0, 1) * 178.5; | |
104 | ||
105 | shadows[i] = low; | |
106 | midtones[i] = mid; | |
107 | highlights[255 - i] = low; | |
108 | } | |
109 | ||
110 | for (i = 0; i < 256; i++) { | |
111 | r = g = b = i; | |
112 | ||
113 | r = av_clip_uint8(r + cb->cyan_red.shadows * shadows[r]); | |
114 | r = av_clip_uint8(r + cb->cyan_red.midtones * midtones[r]); | |
115 | r = av_clip_uint8(r + cb->cyan_red.highlights * highlights[r]); | |
116 | ||
117 | g = av_clip_uint8(g + cb->magenta_green.shadows * shadows[g]); | |
118 | g = av_clip_uint8(g + cb->magenta_green.midtones * midtones[g]); | |
119 | g = av_clip_uint8(g + cb->magenta_green.highlights * highlights[g]); | |
120 | ||
121 | b = av_clip_uint8(b + cb->yellow_blue.shadows * shadows[b]); | |
122 | b = av_clip_uint8(b + cb->yellow_blue.midtones * midtones[b]); | |
123 | b = av_clip_uint8(b + cb->yellow_blue.highlights * highlights[b]); | |
124 | ||
125 | cb->lut[R][i] = r; | |
126 | cb->lut[G][i] = g; | |
127 | cb->lut[B][i] = b; | |
128 | } | |
129 | ||
130 | av_free(buffer); | |
131 | ||
132 | ff_fill_rgba_map(cb->rgba_map, outlink->format); | |
133 | cb->step = av_get_padded_bits_per_pixel(desc) >> 3; | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
138 | static int filter_frame(AVFilterLink *inlink, AVFrame *in) | |
139 | { | |
140 | AVFilterContext *ctx = inlink->dst; | |
141 | ColorBalanceContext *cb = ctx->priv; | |
142 | AVFilterLink *outlink = ctx->outputs[0]; | |
143 | const uint8_t roffset = cb->rgba_map[R]; | |
144 | const uint8_t goffset = cb->rgba_map[G]; | |
145 | const uint8_t boffset = cb->rgba_map[B]; | |
146 | const uint8_t aoffset = cb->rgba_map[A]; | |
147 | const int step = cb->step; | |
148 | const uint8_t *srcrow = in->data[0]; | |
149 | uint8_t *dstrow; | |
150 | AVFrame *out; | |
151 | int i, j; | |
152 | ||
153 | if (av_frame_is_writable(in)) { | |
154 | out = in; | |
155 | } else { | |
156 | out = ff_get_video_buffer(outlink, outlink->w, outlink->h); | |
157 | if (!out) { | |
158 | av_frame_free(&in); | |
159 | return AVERROR(ENOMEM); | |
160 | } | |
161 | av_frame_copy_props(out, in); | |
162 | } | |
163 | ||
164 | dstrow = out->data[0]; | |
165 | for (i = 0; i < outlink->h; i++) { | |
166 | const uint8_t *src = srcrow; | |
167 | uint8_t *dst = dstrow; | |
168 | ||
169 | for (j = 0; j < outlink->w * step; j += step) { | |
170 | dst[j + roffset] = cb->lut[R][src[j + roffset]]; | |
171 | dst[j + goffset] = cb->lut[G][src[j + goffset]]; | |
172 | dst[j + boffset] = cb->lut[B][src[j + boffset]]; | |
173 | if (in != out && step == 4) | |
174 | dst[j + aoffset] = src[j + aoffset]; | |
175 | } | |
176 | ||
177 | srcrow += in->linesize[0]; | |
178 | dstrow += out->linesize[0]; | |
179 | } | |
180 | ||
181 | if (in != out) | |
182 | av_frame_free(&in); | |
183 | return ff_filter_frame(ctx->outputs[0], out); | |
184 | } | |
185 | ||
186 | static const AVFilterPad colorbalance_inputs[] = { | |
187 | { | |
188 | .name = "default", | |
189 | .type = AVMEDIA_TYPE_VIDEO, | |
190 | .filter_frame = filter_frame, | |
191 | }, | |
192 | { NULL } | |
193 | }; | |
194 | ||
195 | static const AVFilterPad colorbalance_outputs[] = { | |
196 | { | |
197 | .name = "default", | |
198 | .type = AVMEDIA_TYPE_VIDEO, | |
199 | .config_props = config_output, | |
200 | }, | |
201 | { NULL } | |
202 | }; | |
203 | ||
204 | AVFilter ff_vf_colorbalance = { | |
205 | .name = "colorbalance", | |
206 | .description = NULL_IF_CONFIG_SMALL("Adjust the color balance."), | |
207 | .priv_size = sizeof(ColorBalanceContext), | |
208 | .priv_class = &colorbalance_class, | |
209 | .query_formats = query_formats, | |
210 | .inputs = colorbalance_inputs, | |
211 | .outputs = colorbalance_outputs, | |
212 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, | |
213 | }; |