518 lines
17 KiB
C
518 lines
17 KiB
C
/*
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* Copyright (c) 2013 Clément Bœsch
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/opt.h"
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#include "libavutil/bprint.h"
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#include "libavutil/eval.h"
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#include "libavutil/file.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/avassert.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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struct keypoint {
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double x, y;
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struct keypoint *next;
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};
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#define NB_COMP 3
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enum preset {
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PRESET_NONE,
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PRESET_COLOR_NEGATIVE,
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PRESET_CROSS_PROCESS,
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PRESET_DARKER,
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PRESET_INCREASE_CONTRAST,
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PRESET_LIGHTER,
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PRESET_LINEAR_CONTRAST,
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PRESET_MEDIUM_CONTRAST,
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PRESET_NEGATIVE,
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PRESET_STRONG_CONTRAST,
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PRESET_VINTAGE,
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NB_PRESETS,
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};
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typedef struct {
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const AVClass *class;
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enum preset preset;
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char *comp_points_str[NB_COMP + 1];
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char *comp_points_str_all;
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uint8_t graph[NB_COMP + 1][256];
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char *psfile;
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} CurvesContext;
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#define OFFSET(x) offsetof(CurvesContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption curves_options[] = {
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{ "preset", "select a color curves preset", OFFSET(preset), AV_OPT_TYPE_INT, {.i64=PRESET_NONE}, PRESET_NONE, NB_PRESETS-1, FLAGS, "preset_name" },
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{ "none", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_NONE}, INT_MIN, INT_MAX, FLAGS, "preset_name" },
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{ "color_negative", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_COLOR_NEGATIVE}, INT_MIN, INT_MAX, FLAGS, "preset_name" },
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{ "cross_process", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_CROSS_PROCESS}, INT_MIN, INT_MAX, FLAGS, "preset_name" },
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{ "darker", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_DARKER}, INT_MIN, INT_MAX, FLAGS, "preset_name" },
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{ "increase_contrast", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_INCREASE_CONTRAST}, INT_MIN, INT_MAX, FLAGS, "preset_name" },
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{ "lighter", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_LIGHTER}, INT_MIN, INT_MAX, FLAGS, "preset_name" },
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{ "linear_contrast", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_LINEAR_CONTRAST}, INT_MIN, INT_MAX, FLAGS, "preset_name" },
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{ "medium_contrast", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_MEDIUM_CONTRAST}, INT_MIN, INT_MAX, FLAGS, "preset_name" },
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{ "negative", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_NEGATIVE}, INT_MIN, INT_MAX, FLAGS, "preset_name" },
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{ "strong_contrast", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_STRONG_CONTRAST}, INT_MIN, INT_MAX, FLAGS, "preset_name" },
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{ "vintage", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_VINTAGE}, INT_MIN, INT_MAX, FLAGS, "preset_name" },
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{ "master","set master points coordinates",OFFSET(comp_points_str[NB_COMP]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
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{ "m", "set master points coordinates",OFFSET(comp_points_str[NB_COMP]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
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{ "red", "set red points coordinates", OFFSET(comp_points_str[0]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
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{ "r", "set red points coordinates", OFFSET(comp_points_str[0]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
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{ "green", "set green points coordinates", OFFSET(comp_points_str[1]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
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{ "g", "set green points coordinates", OFFSET(comp_points_str[1]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
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{ "blue", "set blue points coordinates", OFFSET(comp_points_str[2]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
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{ "b", "set blue points coordinates", OFFSET(comp_points_str[2]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
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{ "all", "set points coordinates for all components", OFFSET(comp_points_str_all), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
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{ "psfile", "set Photoshop curves file name", OFFSET(psfile), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(curves);
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static const struct {
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const char *r;
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const char *g;
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const char *b;
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const char *master;
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} curves_presets[] = {
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[PRESET_COLOR_NEGATIVE] = {
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"0/1 0.129/1 0.466/0.498 0.725/0 1/0",
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"0/1 0.109/1 0.301/0.498 0.517/0 1/0",
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"0/1 0.098/1 0.235/0.498 0.423/0 1/0",
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},
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[PRESET_CROSS_PROCESS] = {
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"0.25/0.156 0.501/0.501 0.686/0.745",
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"0.25/0.188 0.38/0.501 0.745/0.815 1/0.815",
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"0.231/0.094 0.709/0.874",
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},
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[PRESET_DARKER] = { .master = "0.5/0.4" },
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[PRESET_INCREASE_CONTRAST] = { .master = "0.149/0.066 0.831/0.905 0.905/0.98" },
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[PRESET_LIGHTER] = { .master = "0.4/0.5" },
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[PRESET_LINEAR_CONTRAST] = { .master = "0.305/0.286 0.694/0.713" },
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[PRESET_MEDIUM_CONTRAST] = { .master = "0.286/0.219 0.639/0.643" },
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[PRESET_NEGATIVE] = { .master = "0/1 1/0" },
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[PRESET_STRONG_CONTRAST] = { .master = "0.301/0.196 0.592/0.6 0.686/0.737" },
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[PRESET_VINTAGE] = {
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"0/0.11 0.42/0.51 1/0.95",
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"0.50/0.48",
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"0/0.22 0.49/0.44 1/0.8",
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}
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};
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static struct keypoint *make_point(double x, double y, struct keypoint *next)
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{
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struct keypoint *point = av_mallocz(sizeof(*point));
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if (!point)
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return NULL;
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point->x = x;
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point->y = y;
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point->next = next;
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return point;
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}
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static int parse_points_str(AVFilterContext *ctx, struct keypoint **points, const char *s)
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{
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char *p = (char *)s; // strtod won't alter the string
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struct keypoint *last = NULL;
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/* construct a linked list based on the key points string */
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while (p && *p) {
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struct keypoint *point = make_point(0, 0, NULL);
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if (!point)
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return AVERROR(ENOMEM);
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point->x = av_strtod(p, &p); if (p && *p) p++;
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point->y = av_strtod(p, &p); if (p && *p) p++;
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if (point->x < 0 || point->x > 1 || point->y < 0 || point->y > 1) {
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av_log(ctx, AV_LOG_ERROR, "Invalid key point coordinates (%f;%f), "
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"x and y must be in the [0;1] range.\n", point->x, point->y);
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return AVERROR(EINVAL);
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}
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if (!*points)
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*points = point;
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if (last) {
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if ((int)(last->x * 255) >= (int)(point->x * 255)) {
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av_log(ctx, AV_LOG_ERROR, "Key point coordinates (%f;%f) "
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"and (%f;%f) are too close from each other or not "
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"strictly increasing on the x-axis\n",
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last->x, last->y, point->x, point->y);
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return AVERROR(EINVAL);
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}
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last->next = point;
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}
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last = point;
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}
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/* auto insert first key point if missing at x=0 */
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if (!*points) {
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last = make_point(0, 0, NULL);
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if (!last)
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return AVERROR(ENOMEM);
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last->x = last->y = 0;
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*points = last;
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} else if ((*points)->x != 0.) {
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struct keypoint *newfirst = make_point(0, 0, *points);
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if (!newfirst)
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return AVERROR(ENOMEM);
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*points = newfirst;
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}
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av_assert0(last);
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/* auto insert last key point if missing at x=1 */
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if (last->x != 1.) {
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struct keypoint *point = make_point(1, 1, NULL);
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if (!point)
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return AVERROR(ENOMEM);
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last->next = point;
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}
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return 0;
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}
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static int get_nb_points(const struct keypoint *d)
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{
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int n = 0;
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while (d) {
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n++;
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d = d->next;
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}
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return n;
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}
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/**
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* Natural cubic spline interpolation
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* Finding curves using Cubic Splines notes by Steven Rauch and John Stockie.
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* @see http://people.math.sfu.ca/~stockie/teaching/macm316/notes/splines.pdf
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*/
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static int interpolate(AVFilterContext *ctx, uint8_t *y, const struct keypoint *points)
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{
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int i, ret = 0;
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const struct keypoint *point;
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double xprev = 0;
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int n = get_nb_points(points); // number of splines
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double (*matrix)[3] = av_calloc(n, sizeof(*matrix));
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double *h = av_malloc((n - 1) * sizeof(*h));
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double *r = av_calloc(n, sizeof(*r));
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if (!matrix || !h || !r) {
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ret = AVERROR(ENOMEM);
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goto end;
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}
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/* h(i) = x(i+1) - x(i) */
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i = -1;
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for (point = points; point; point = point->next) {
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if (i != -1)
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h[i] = point->x - xprev;
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xprev = point->x;
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i++;
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}
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/* right-side of the polynomials, will be modified to contains the solution */
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point = points;
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for (i = 1; i < n - 1; i++) {
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double yp = point->y,
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yc = point->next->y,
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yn = point->next->next->y;
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r[i] = 6 * ((yn-yc)/h[i] - (yc-yp)/h[i-1]);
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point = point->next;
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}
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#define B 0 /* sub diagonal (below main) */
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#define M 1 /* main diagonal (center) */
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#define A 2 /* sup diagonal (above main) */
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/* left side of the polynomials into a tridiagonal matrix. */
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matrix[0][M] = matrix[n - 1][M] = 1;
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for (i = 1; i < n - 1; i++) {
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matrix[i][B] = h[i-1];
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matrix[i][M] = 2 * (h[i-1] + h[i]);
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matrix[i][A] = h[i];
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}
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/* tridiagonal solving of the linear system */
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for (i = 1; i < n; i++) {
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double den = matrix[i][M] - matrix[i][B] * matrix[i-1][A];
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double k = den ? 1./den : 1.;
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matrix[i][A] *= k;
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r[i] = (r[i] - matrix[i][B] * r[i - 1]) * k;
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}
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for (i = n - 2; i >= 0; i--)
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r[i] = r[i] - matrix[i][A] * r[i + 1];
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/* compute the graph with x=[0..255] */
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i = 0;
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point = points;
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av_assert0(point->next); // always at least 2 key points
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while (point->next) {
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double yc = point->y;
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double yn = point->next->y;
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double a = yc;
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double b = (yn-yc)/h[i] - h[i]*r[i]/2. - h[i]*(r[i+1]-r[i])/6.;
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double c = r[i] / 2.;
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double d = (r[i+1] - r[i]) / (6.*h[i]);
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int x;
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int x_start = point->x * 255;
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int x_end = point->next->x * 255;
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av_assert0(x_start >= 0 && x_start <= 255 &&
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x_end >= 0 && x_end <= 255);
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for (x = x_start; x <= x_end; x++) {
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double xx = (x - x_start) * 1/255.;
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double yy = a + b*xx + c*xx*xx + d*xx*xx*xx;
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y[x] = av_clipf(yy, 0, 1) * 255;
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av_log(ctx, AV_LOG_DEBUG, "f(%f)=%f -> y[%d]=%d\n", xx, yy, x, y[x]);
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}
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point = point->next;
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i++;
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}
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end:
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av_free(matrix);
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av_free(h);
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av_free(r);
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return ret;
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}
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static int parse_psfile(AVFilterContext *ctx, const char *fname)
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{
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CurvesContext *curves = ctx->priv;
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uint8_t *buf;
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size_t size;
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int i, ret, av_unused(version), nb_curves;
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AVBPrint ptstr;
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static const int comp_ids[] = {3, 0, 1, 2};
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av_bprint_init(&ptstr, 0, AV_BPRINT_SIZE_AUTOMATIC);
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ret = av_file_map(fname, &buf, &size, 0, NULL);
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if (ret < 0)
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return ret;
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#define READ16(dst) do { \
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if (size < 2) \
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return AVERROR_INVALIDDATA; \
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dst = AV_RB16(buf); \
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buf += 2; \
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size -= 2; \
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} while (0)
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READ16(version);
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READ16(nb_curves);
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for (i = 0; i < FFMIN(nb_curves, FF_ARRAY_ELEMS(comp_ids)); i++) {
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int nb_points, n;
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av_bprint_clear(&ptstr);
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READ16(nb_points);
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for (n = 0; n < nb_points; n++) {
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int y, x;
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READ16(y);
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READ16(x);
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av_bprintf(&ptstr, "%f/%f ", x / 255., y / 255.);
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}
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if (*ptstr.str) {
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char **pts = &curves->comp_points_str[comp_ids[i]];
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if (!*pts) {
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*pts = av_strdup(ptstr.str);
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av_log(ctx, AV_LOG_DEBUG, "curves %d (intid=%d) [%d points]: [%s]\n",
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i, comp_ids[i], nb_points, *pts);
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if (!*pts) {
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ret = AVERROR(ENOMEM);
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goto end;
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}
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}
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}
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}
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end:
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av_bprint_finalize(&ptstr, NULL);
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av_file_unmap(buf, size);
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return ret;
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}
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static av_cold int init(AVFilterContext *ctx)
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{
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int i, j, ret;
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CurvesContext *curves = ctx->priv;
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struct keypoint *comp_points[NB_COMP + 1] = {0};
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char **pts = curves->comp_points_str;
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const char *allp = curves->comp_points_str_all;
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//if (!allp && curves->preset != PRESET_NONE && curves_presets[curves->preset].all)
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// allp = curves_presets[curves->preset].all;
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if (allp) {
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for (i = 0; i < NB_COMP; i++) {
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if (!pts[i])
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pts[i] = av_strdup(allp);
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if (!pts[i])
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return AVERROR(ENOMEM);
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}
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}
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if (curves->psfile) {
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ret = parse_psfile(ctx, curves->psfile);
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if (ret < 0)
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return ret;
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}
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if (curves->preset != PRESET_NONE) {
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#define SET_COMP_IF_NOT_SET(n, name) do { \
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if (!pts[n] && curves_presets[curves->preset].name) { \
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pts[n] = av_strdup(curves_presets[curves->preset].name); \
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if (!pts[n]) \
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return AVERROR(ENOMEM); \
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} \
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} while (0)
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SET_COMP_IF_NOT_SET(0, r);
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SET_COMP_IF_NOT_SET(1, g);
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SET_COMP_IF_NOT_SET(2, b);
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SET_COMP_IF_NOT_SET(3, master);
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}
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for (i = 0; i < NB_COMP + 1; i++) {
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ret = parse_points_str(ctx, comp_points + i, curves->comp_points_str[i]);
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if (ret < 0)
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return ret;
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ret = interpolate(ctx, curves->graph[i], comp_points[i]);
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if (ret < 0)
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return ret;
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}
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if (pts[NB_COMP]) {
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for (i = 0; i < NB_COMP; i++)
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for (j = 0; j < 256; j++)
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curves->graph[i][j] = curves->graph[NB_COMP][curves->graph[i][j]];
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}
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if (av_log_get_level() >= AV_LOG_VERBOSE) {
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for (i = 0; i < NB_COMP; i++) {
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struct keypoint *point = comp_points[i];
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av_log(ctx, AV_LOG_VERBOSE, "#%d points:", i);
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while (point) {
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av_log(ctx, AV_LOG_VERBOSE, " (%f;%f)", point->x, point->y);
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point = point->next;
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}
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av_log(ctx, AV_LOG_VERBOSE, "\n");
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av_log(ctx, AV_LOG_VERBOSE, "#%d values:", i);
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for (j = 0; j < 256; j++)
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av_log(ctx, AV_LOG_VERBOSE, " %02X", curves->graph[i][j]);
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av_log(ctx, AV_LOG_VERBOSE, "\n");
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}
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}
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for (i = 0; i < NB_COMP + 1; i++) {
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struct keypoint *point = comp_points[i];
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while (point) {
|
|
struct keypoint *next = point->next;
|
|
av_free(point);
|
|
point = next;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int query_formats(AVFilterContext *ctx)
|
|
{
|
|
static const enum AVPixelFormat pix_fmts[] = {AV_PIX_FMT_RGB24, AV_PIX_FMT_NONE};
|
|
ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
|
|
return 0;
|
|
}
|
|
|
|
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
|
|
{
|
|
int x, y, i, direct = 0;
|
|
AVFilterContext *ctx = inlink->dst;
|
|
CurvesContext *curves = ctx->priv;
|
|
AVFilterLink *outlink = inlink->dst->outputs[0];
|
|
AVFrame *out;
|
|
uint8_t *dst;
|
|
const uint8_t *src;
|
|
|
|
if (av_frame_is_writable(in)) {
|
|
direct = 1;
|
|
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);
|
|
}
|
|
|
|
dst = out->data[0];
|
|
src = in ->data[0];
|
|
|
|
for (y = 0; y < inlink->h; y++) {
|
|
uint8_t *dstp = dst;
|
|
const uint8_t *srcp = src;
|
|
|
|
for (x = 0; x < inlink->w; x++)
|
|
for (i = 0; i < NB_COMP; i++, dstp++, srcp++)
|
|
*dstp = curves->graph[i][*srcp];
|
|
dst += out->linesize[0];
|
|
src += in ->linesize[0];
|
|
}
|
|
|
|
if (!direct)
|
|
av_frame_free(&in);
|
|
|
|
return ff_filter_frame(outlink, out);
|
|
}
|
|
|
|
static const AVFilterPad curves_inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.filter_frame = filter_frame,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad curves_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
AVFilter avfilter_vf_curves = {
|
|
.name = "curves",
|
|
.description = NULL_IF_CONFIG_SMALL("Adjust components curves."),
|
|
.priv_size = sizeof(CurvesContext),
|
|
.init = init,
|
|
.query_formats = query_formats,
|
|
.inputs = curves_inputs,
|
|
.outputs = curves_outputs,
|
|
.priv_class = &curves_class,
|
|
};
|