| 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 | }; |