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- /*
- * 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
- };
- AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
- if (!fmts_list)
- return AVERROR(ENOMEM);
- return ff_set_common_formats(ctx, fmts_list);
- }
- static int config_output(AVFilterLink *outlink)
- {
- AVFilterContext *ctx = outlink->src;
- ColorBalanceContext *s = 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 + s->cyan_red.shadows * shadows[r]);
- r = av_clip_uint8(r + s->cyan_red.midtones * midtones[r]);
- r = av_clip_uint8(r + s->cyan_red.highlights * highlights[r]);
- g = av_clip_uint8(g + s->magenta_green.shadows * shadows[g]);
- g = av_clip_uint8(g + s->magenta_green.midtones * midtones[g]);
- g = av_clip_uint8(g + s->magenta_green.highlights * highlights[g]);
- b = av_clip_uint8(b + s->yellow_blue.shadows * shadows[b]);
- b = av_clip_uint8(b + s->yellow_blue.midtones * midtones[b]);
- b = av_clip_uint8(b + s->yellow_blue.highlights * highlights[b]);
- s->lut[R][i] = r;
- s->lut[G][i] = g;
- s->lut[B][i] = b;
- }
- av_free(buffer);
- ff_fill_rgba_map(s->rgba_map, outlink->format);
- s->step = av_get_padded_bits_per_pixel(desc) >> 3;
- return 0;
- }
- static int filter_frame(AVFilterLink *inlink, AVFrame *in)
- {
- AVFilterContext *ctx = inlink->dst;
- ColorBalanceContext *s = ctx->priv;
- AVFilterLink *outlink = ctx->outputs[0];
- const uint8_t roffset = s->rgba_map[R];
- const uint8_t goffset = s->rgba_map[G];
- const uint8_t boffset = s->rgba_map[B];
- const uint8_t aoffset = s->rgba_map[A];
- const int step = s->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] = s->lut[R][src[j + roffset]];
- dst[j + goffset] = s->lut[G][src[j + goffset]];
- dst[j + boffset] = s->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 ff_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,
- };
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