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FFmpeg/libavfilter/vf_curves.c

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  1. /*

  2.  * Copyright (c) 2013 Clément Bœsch

  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/eval.h"

  23. #include "libavutil/avassert.h"

  24. #include "avfilter.h"

  25. #include "formats.h"

  26. #include "internal.h"

  27. #include "video.h"

  28. 

  29. struct keypoint {

  30.     double x, y;

  31.     struct keypoint *next;

  32. };

  33. 

  34. #define NB_COMP 3

  35. 

  36. enum preset {

  37.     PRESET_NONE,

  38.     PRESET_COLOR_NEGATIVE,

  39.     PRESET_CROSS_PROCESS,

  40.     PRESET_DARKER,

  41.     PRESET_INCREASE_CONTRAST,

  42.     PRESET_LIGHTER,

  43.     PRESET_LINEAR_CONTRAST,

  44.     PRESET_MEDIUM_CONTRAST,

  45.     PRESET_NEGATIVE,

  46.     PRESET_STRONG_CONTRAST,

  47.     PRESET_VINTAGE,

  48.     NB_PRESETS,

  49. };

  50. 

  51. typedef struct {

  52.     const AVClass *class;

  53.     enum preset preset;

  54.     char *comp_points_str[NB_COMP];

  55.     char *comp_points_str_all;

  56.     uint8_t graph[NB_COMP][256];

  57. } CurvesContext;

  58. 

  59. #define OFFSET(x) offsetof(CurvesContext, x)

  60. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

  61. static const AVOption curves_options[] = {

  62.     { "preset", "select a color curves preset", OFFSET(preset), AV_OPT_TYPE_INT, {.i64=PRESET_NONE}, PRESET_NONE, NB_PRESETS-1, FLAGS, "preset_name" },

  63.         { "none",               NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_NONE},                 INT_MIN, INT_MAX, FLAGS, "preset_name" },

  64.         { "color_negative",     NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_COLOR_NEGATIVE},       INT_MIN, INT_MAX, FLAGS, "preset_name" },

  65.         { "cross_process",      NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_CROSS_PROCESS},        INT_MIN, INT_MAX, FLAGS, "preset_name" },

  66.         { "darker",             NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_DARKER},               INT_MIN, INT_MAX, FLAGS, "preset_name" },

  67.         { "increase_contrast",  NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_INCREASE_CONTRAST},    INT_MIN, INT_MAX, FLAGS, "preset_name" },

  68.         { "lighter",            NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_LIGHTER},              INT_MIN, INT_MAX, FLAGS, "preset_name" },

  69.         { "linear_contrast",    NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_LINEAR_CONTRAST},      INT_MIN, INT_MAX, FLAGS, "preset_name" },

  70.         { "medium_contrast",    NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_MEDIUM_CONTRAST},      INT_MIN, INT_MAX, FLAGS, "preset_name" },

  71.         { "negative",           NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_NEGATIVE},             INT_MIN, INT_MAX, FLAGS, "preset_name" },

  72.         { "strong_contrast",    NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_STRONG_CONTRAST},      INT_MIN, INT_MAX, FLAGS, "preset_name" },

  73.         { "vintage",            NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_VINTAGE},              INT_MIN, INT_MAX, FLAGS, "preset_name" },

  74.     { "red",   "set red points coordinates",   OFFSET(comp_points_str[0]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },

  75.     { "r",     "set red points coordinates",   OFFSET(comp_points_str[0]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },

  76.     { "green", "set green points coordinates", OFFSET(comp_points_str[1]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },

  77.     { "g",     "set green points coordinates", OFFSET(comp_points_str[1]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },

  78.     { "blue",  "set blue points coordinates",  OFFSET(comp_points_str[2]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },

  79.     { "b",     "set blue points coordinates",  OFFSET(comp_points_str[2]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },

  80.     { "all",   "set points coordinates for all components", OFFSET(comp_points_str_all), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },

  81.     { NULL }

  82. };

  83. 

  84. AVFILTER_DEFINE_CLASS(curves);

  85. 

  86. static const struct {

  87.     const char *r;

  88.     const char *g;

  89.     const char *b;

  90.     const char *all;

  91. } curves_presets[] = {

  92.     [PRESET_COLOR_NEGATIVE] = {

  93.         "0/1 0.129/1 0.466/0.498 0.725/0 1/0",

  94.         "0/1 0.109/1 0.301/0.498 0.517/0 1/0",

  95.         "0/1 0.098/1 0.235/0.498 0.423/0 1/0",

  96.     },

  97.     [PRESET_CROSS_PROCESS] = {

  98.         "0.25/0.156 0.501/0.501 0.686/0.745",

  99.         "0.25/0.188 0.38/0.501 0.745/0.815 1/0.815",

  100.         "0.231/0.094 0.709/0.874",

  101.     },

  102.     [PRESET_DARKER]             = { .all = "0.5/0.4" },

  103.     [PRESET_INCREASE_CONTRAST]  = { .all = "0.149/0.066 0.831/0.905 0.905/0.98" },

  104.     [PRESET_LIGHTER]            = { .all = "0.4/0.5" },

  105.     [PRESET_LINEAR_CONTRAST]    = { .all = "0.305/0.286 0.694/0.713" },

  106.     [PRESET_MEDIUM_CONTRAST]    = { .all = "0.286/0.219 0.639/0.643" },

  107.     [PRESET_NEGATIVE]           = { .all = "0/1 1/0" },

  108.     [PRESET_STRONG_CONTRAST]    = { .all = "0.301/0.196 0.592/0.6 0.686/0.737" },

  109.     [PRESET_VINTAGE] = {

  110.         "0/0.11 0.42/0.51 1/0.95",

  111.         "0.50/0.48",

  112.         "0/0.22 0.49/0.44 1/0.8",

  113.     }

  114. };

  115. 

  116. static struct keypoint *make_point(double x, double y, struct keypoint *next)

  117. {

  118.     struct keypoint *point = av_mallocz(sizeof(*point));

  119. 

  120.     if (!point)

  121.         return NULL;

  122.     point->x = x;

  123.     point->y = y;

  124.     point->next = next;

  125.     return point;

  126. }

  127. 

  128. static int parse_points_str(AVFilterContext *ctx, struct keypoint **points, const char *s)

  129. {

  130.     char *p = (char *)s; // strtod won't alter the string

  131.     struct keypoint *last = NULL;

  132. 

  133.     /* construct a linked list based on the key points string */

  134.     while (p && *p) {

  135.         struct keypoint *point = make_point(0, 0, NULL);

  136.         if (!point)

  137.             return AVERROR(ENOMEM);

  138.         point->x = av_strtod(p, &p); if (p && *p) p++;

  139.         point->y = av_strtod(p, &p); if (p && *p) p++;

  140.         if (point->x < 0 || point->x > 1 || point->y < 0 || point->y > 1) {

  141.             av_log(ctx, AV_LOG_ERROR, "Invalid key point coordinates (%f;%f), "

  142.                    "x and y must be in the [0;1] range.\n", point->x, point->y);

  143.             return AVERROR(EINVAL);

  144.         }

  145.         if (!*points)

  146.             *points = point;

  147.         if (last) {

  148.             if ((int)(last->x * 255) >= (int)(point->x * 255)) {

  149.                 av_log(ctx, AV_LOG_ERROR, "Key point coordinates (%f;%f) "

  150.                        "and (%f;%f) are too close from each other or not "

  151.                        "strictly increasing on the x-axis\n",

  152.                        last->x, last->y, point->x, point->y);

  153.                 return AVERROR(EINVAL);

  154.             }

  155.             last->next = point;

  156.         }

  157.         last = point;

  158.     }

  159. 

  160.     /* auto insert first key point if missing at x=0 */

  161.     if (!*points) {

  162.         last = make_point(0, 0, NULL);

  163.         if (!last)

  164.             return AVERROR(ENOMEM);

  165.         last->x = last->y = 0;

  166.         *points = last;

  167.     } else if ((*points)->x != 0.) {

  168.         struct keypoint *newfirst = make_point(0, 0, *points);

  169.         if (!newfirst)

  170.             return AVERROR(ENOMEM);

  171.         *points = newfirst;

  172.     }

  173. 

  174.     av_assert0(last);

  175. 

  176.     /* auto insert last key point if missing at x=1 */

  177.     if (last->x != 1.) {

  178.         struct keypoint *point = make_point(1, 1, NULL);

  179.         if (!point)

  180.             return AVERROR(ENOMEM);

  181.         last->next = point;

  182.     }

  183. 

  184.     return 0;

  185. }

  186. 

  187. static int get_nb_points(const struct keypoint *d)

  188. {

  189.     int n = 0;

  190.     while (d) {

  191.         n++;

  192.         d = d->next;

  193.     }

  194.     return n;

  195. }

  196. 

  197. /**

  198.  * Natural cubic spline interpolation

  199.  * Finding curves using Cubic Splines notes by Steven Rauch and John Stockie.

  200.  * @see http://people.math.sfu.ca/~stockie/teaching/macm316/notes/splines.pdf

  201.  */

  202. static int interpolate(AVFilterContext *ctx, uint8_t *y, const struct keypoint *points)

  203. {

  204.     int i, ret = 0;

  205.     const struct keypoint *point;

  206.     double xprev = 0;

  207. 

  208.     int n = get_nb_points(points); // number of splines

  209. 

  210.     double (*matrix)[3] = av_calloc(n, sizeof(*matrix));

  211.     double *h = av_malloc((n - 1) * sizeof(*h));

  212.     double *r = av_calloc(n, sizeof(*r));

  213. 

  214.     if (!matrix || !h || !r) {

  215.         ret = AVERROR(ENOMEM);

  216.         goto end;

  217.     }

  218. 

  219.     /* h(i) = x(i+1) - x(i) */

  220.     i = -1;

  221.     for (point = points; point; point = point->next) {

  222.         if (i != -1)

  223.             h[i] = point->x - xprev;

  224.         xprev = point->x;

  225.         i++;

  226.     }

  227. 

  228.     /* right-side of the polynomials, will be modified to contains the solution */

  229.     point = points;

  230.     for (i = 1; i < n - 1; i++) {

  231.         double yp = point->y,

  232.                yc = point->next->y,

  233.                yn = point->next->next->y;

  234.         r[i] = 6 * ((yn-yc)/h[i] - (yc-yp)/h[i-1]);

  235.         point = point->next;

  236.     }

  237. 

  238. #define B 0 /* sub  diagonal (below main) */

  239. #define M 1 /* main diagonal (center) */

  240. #define A 2 /* sup  diagonal (above main) */

  241. 

  242.     /* left side of the polynomials into a tridiagonal matrix. */

  243.     matrix[0][M] = matrix[n - 1][M] = 1;

  244.     for (i = 1; i < n - 1; i++) {

  245.         matrix[i][B] = h[i-1];

  246.         matrix[i][M] = 2 * (h[i-1] + h[i]);

  247.         matrix[i][A] = h[i];

  248.     }

  249. 

  250.     /* tridiagonal solving of the linear system */

  251.     for (i = 1; i < n; i++) {

  252.         double den = matrix[i][M] - matrix[i][B] * matrix[i-1][A];

  253.         double k = den ? 1./den : 1.;

  254.         matrix[i][A] *= k;

  255.         r[i] = (r[i] - matrix[i][B] * r[i - 1]) * k;

  256.     }

  257.     for (i = n - 2; i >= 0; i--)

  258.         r[i] = r[i] - matrix[i][A] * r[i + 1];

  259. 

  260.     /* compute the graph with x=[0..255] */

  261.     i = 0;

  262.     point = points;

  263.     av_assert0(point->next); // always at least 2 key points

  264.     while (point->next) {

  265.         double yc = point->y;

  266.         double yn = point->next->y;

  267. 

  268.         double a = yc;

  269.         double b = (yn-yc)/h[i] - h[i]*r[i]/2. - h[i]*(r[i+1]-r[i])/6.;

  270.         double c = r[i] / 2.;

  271.         double d = (r[i+1] - r[i]) / (6.*h[i]);

  272. 

  273.         int x;

  274.         int x_start = point->x       * 255;

  275.         int x_end   = point->next->x * 255;

  276. 

  277.         av_assert0(x_start >= 0 && x_start <= 255 &&

  278.                    x_end   >= 0 && x_end   <= 255);

  279. 

  280.         for (x = x_start; x <= x_end; x++) {

  281.             double xx = (x - x_start) * 1/255.;

  282.             double yy = a + b*xx + c*xx*xx + d*xx*xx*xx;

  283.             y[x] = av_clipf(yy, 0, 1) * 255;

  284.             av_log(ctx, AV_LOG_DEBUG, "f(%f)=%f -> y[%d]=%d\n", xx, yy, x, y[x]);

  285.         }

  286. 

  287.         point = point->next;

  288.         i++;

  289.     }

  290. 

  291. end:

  292.     av_free(matrix);

  293.     av_free(h);

  294.     av_free(r);

  295.     return ret;

  296. }

  297. 

  298. static av_cold int init(AVFilterContext *ctx, const char *args)

  299. {

  300.     int i, j, ret;

  301.     CurvesContext *curves = ctx->priv;

  302.     struct keypoint *comp_points[NB_COMP] = {0};

  303.     char **pts = curves->comp_points_str;

  304.     const char *allp = curves->comp_points_str_all;

  305. 

  306.     if (!allp && curves->preset != PRESET_NONE && curves_presets[curves->preset].all)

  307.         allp = curves_presets[curves->preset].all;

  308. 

  309.     if (allp) {

  310.         for (i = 0; i < NB_COMP; i++) {

  311.             if (!pts[i])

  312.                 pts[i] = av_strdup(allp);

  313.             if (!pts[i])

  314.                 return AVERROR(ENOMEM);

  315.         }

  316.     }

  317. 

  318.     if (curves->preset != PRESET_NONE) {

  319.         if (!pts[0]) pts[0] = av_strdup(curves_presets[curves->preset].r);

  320.         if (!pts[1]) pts[1] = av_strdup(curves_presets[curves->preset].g);

  321.         if (!pts[2]) pts[2] = av_strdup(curves_presets[curves->preset].b);

  322.         if (!pts[0] || !pts[1] || !pts[2])

  323.             return AVERROR(ENOMEM);

  324.     }

  325. 

  326.     for (i = 0; i < NB_COMP; i++) {

  327.         ret = parse_points_str(ctx, comp_points + i, curves->comp_points_str[i]);

  328.         if (ret < 0)

  329.             return ret;

  330.         ret = interpolate(ctx, curves->graph[i], comp_points[i]);

  331.         if (ret < 0)

  332.             return ret;

  333.     }

  334. 

  335.     if (av_log_get_level() >= AV_LOG_VERBOSE) {

  336.         for (i = 0; i < NB_COMP; i++) {

  337.             struct keypoint *point = comp_points[i];

  338.             av_log(ctx, AV_LOG_VERBOSE, "#%d points:", i);

  339.             while (point) {

  340.                 av_log(ctx, AV_LOG_VERBOSE, " (%f;%f)", point->x, point->y);

  341.                 point = point->next;

  342.             }

  343.             av_log(ctx, AV_LOG_VERBOSE, "\n");

  344.             av_log(ctx, AV_LOG_VERBOSE, "#%d values:", i);

  345.             for (j = 0; j < 256; j++)

  346.                 av_log(ctx, AV_LOG_VERBOSE, " %02X", curves->graph[i][j]);

  347.             av_log(ctx, AV_LOG_VERBOSE, "\n");

  348.         }

  349.     }

  350. 

  351.     for (i = 0; i < NB_COMP; i++) {

  352.         struct keypoint *point = comp_points[i];

  353.         while (point) {

  354.             struct keypoint *next = point->next;

  355.             av_free(point);

  356.             point = next;

  357.         }

  358.     }

  359. 

  360.     return 0;

  361. }

  362. 

  363. static int query_formats(AVFilterContext *ctx)

  364. {

  365.     static const enum AVPixelFormat pix_fmts[] = {AV_PIX_FMT_RGB24, AV_PIX_FMT_NONE};

  366.     ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));

  367.     return 0;

  368. }

  369. 

  370. static int filter_frame(AVFilterLink *inlink, AVFrame *in)

  371. {

  372.     int x, y, i, direct = 0;

  373.     AVFilterContext *ctx = inlink->dst;

  374.     CurvesContext *curves = ctx->priv;

  375.     AVFilterLink *outlink = inlink->dst->outputs[0];

  376.     AVFrame *out;

  377.     uint8_t *dst;

  378.     const uint8_t *src;

  379. 

  380.     if (av_frame_is_writable(in)) {

  381.         direct = 1;

  382.         out = in;

  383.     } else {

  384.         out = ff_get_video_buffer(outlink, outlink->w, outlink->h);

  385.         if (!out) {

  386.             av_frame_free(&in);

  387.             return AVERROR(ENOMEM);

  388.         }

  389.         av_frame_copy_props(out, in);

  390.     }

  391. 

  392.     dst = out->data[0];

  393.     src = in ->data[0];

  394. 

  395.     for (y = 0; y < inlink->h; y++) {

  396.         uint8_t *dstp = dst;

  397.         const uint8_t *srcp = src;

  398. 

  399.         for (x = 0; x < inlink->w; x++)

  400.             for (i = 0; i < NB_COMP; i++, dstp++, srcp++)

  401.                 *dstp = curves->graph[i][*srcp];

  402.         dst += out->linesize[0];

  403.         src += in ->linesize[0];

  404.     }

  405. 

  406.     if (!direct)

  407.         av_frame_free(&in);

  408. 

  409.     return ff_filter_frame(outlink, out);

  410. }

  411. 

  412. static const AVFilterPad curves_inputs[] = {

  413.     {

  414.         .name         = "default",

  415.         .type         = AVMEDIA_TYPE_VIDEO,

  416.         .filter_frame = filter_frame,

  417.     },

  418.     { NULL }

  419. };

  420. 

  421. static const AVFilterPad curves_outputs[] = {

  422.      {

  423.          .name = "default",

  424.          .type = AVMEDIA_TYPE_VIDEO,

  425.      },

  426.      { NULL }

  427. };

  428. 

  429. AVFilter avfilter_vf_curves = {

  430.     .name          = "curves",

  431.     .description   = NULL_IF_CONFIG_SMALL("Adjust components curves."),

  432.     .priv_size     = sizeof(CurvesContext),

  433.     .init          = init,

  434.     .query_formats = query_formats,

  435.     .inputs        = curves_inputs,

  436.     .outputs       = curves_outputs,

  437.     .priv_class    = &curves_class,

  438. };