@@ -2340,6 +2340,22 @@ Set the key points for the red component.

 Set the key points for the green component.

 @item blue, b

 Set the key points for the blue component.

+@item preset

+Select one of the available color presets. This option can not be used in

+addition to the @option{r}, @option{g}, @option{b} parameters.

+Available presets are:

+@table @samp

+@item color_negative

+@item cross_process

+@item darker

+@item increase_contrast

+@item lighter

+@item linear_contrast

+@item medium_contrast

+@item negative

+@item vintage

+@end table

+Default is unset.

 @end table

 To avoid some filtergraph syntax conflicts, each key points list need to be

@@ -2368,6 +2384,12 @@ Here we obtain the following coordinates for each components:

 @item blue

 @code{(0;0.22) (0.49;0.44) (1;0.80)}

 @end table

+

+@item

+The previous example can also be achieved with the associated built-in preset:

+@example

+curves=preset=vintage

+@end example

 @end itemize

 @section decimate

@@ -30,7 +30,7 @@

 #define LIBAVFILTER_VERSION_MAJOR  3

 #define LIBAVFILTER_VERSION_MINOR  48

-#define LIBAVFILTER_VERSION_MICRO 102

+#define LIBAVFILTER_VERSION_MICRO 103

 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

                                                LIBAVFILTER_VERSION_MINOR, \

@@ -35,6 +35,7 @@ struct keypoint {

 typedef struct {

     const AVClass *class;

+    char *preset;

     char *comp_points_str[NB_COMP];

     uint8_t graph[NB_COMP][256];

 } CurvesContext;

@@ -48,11 +49,56 @@ static const AVOption curves_options[] = {

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

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

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

+    { "preset", "select a color curves preset", OFFSET(preset), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },

     { NULL }

 };

 AVFILTER_DEFINE_CLASS(curves);

+static const struct {

+    const char *name;

+    const char *r;

+    const char *g;

+    const char *b;

+} curves_presets[] = { {

+        "color_negative",

+        "0/1 0.129/1 0.466/0.498 0.725/0 1/0",

+        "0/1 0.109/1 0.301/0.498 0.517/0 1/0",

+        "0/1 0.098/1 0.235/0.498 0.423/0 1/0",

+    },{

+        "cross_process",

+        "0.25/0.156 0.501/0.501 0.686/0.745",

+        "0.25/0.188 0.38/0.501 0.745/0.815 1/0.815",

+        "0.231/0.094 0.709/0.874",

+    },{

+        "darker", "0.5/0.4", "0.5/0.4", "0.5/0.4",

+    },{

+        "increase_contrast",

+        "0.149/0.066 0.831/0.905 0.905/0.98",

+        "0.149/0.066 0.831/0.905 0.905/0.98",

+        "0.149/0.066 0.831/0.905 0.905/0.98",

+    },{

+        "lighter", "0.4/0.5", "0.4/0.5", "0.4/0.5",

+    },{

+        "linear_contrast",

+        "0.305/0.286 0.694/0.713",

+        "0.305/0.286 0.694/0.713",

+        "0.305/0.286 0.694/0.713",

+    },{

+        "medium_contrast",

+        "0.286/0.219 0.639/0.643",

+        "0.286/0.219 0.639/0.643",

+        "0.286/0.219 0.639/0.643",

+    },{

+        "negative", "0/1 1/0", "0/1 1/0", "0/1 1/0",

+    },{

+        "vintage",

+        "0/0.11 0.42/0.51 1/0.95",

+        "0.50/0.48",

+        "0/0.22 0.49/0.44 1/0.8",

+    }

+};

+

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

 {

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

@@ -247,6 +293,33 @@ static av_cold int init(AVFilterContext *ctx, const char *args)

     if ((ret = av_set_options_string(curves, args, "=", ":")) < 0)

         return ret;

+    if (curves->preset) {

+        char **pts = curves->comp_points_str;

+        if (pts[0] || pts[1] || pts[2]) {

+            av_log(ctx, AV_LOG_ERROR, "It is not possible to mix a preset "

+                   "with explicit points placements\n");

+            return AVERROR(EINVAL);

+        }

+        for (i = 0; i < FF_ARRAY_ELEMS(curves_presets); i++) {

+            if (!strcmp(curves->preset, curves_presets[i].name)) {

+                pts[0] = av_strdup(curves_presets[i].r);

+                pts[1] = av_strdup(curves_presets[i].g);

+                pts[2] = av_strdup(curves_presets[i].b);

+                if (!pts[0] || !pts[1] || !pts[2])

+                    return AVERROR(ENOMEM);

+                break;

+            }

+        }

+        if (i == FF_ARRAY_ELEMS(curves_presets)) {

+            av_log(ctx, AV_LOG_ERROR, "Preset '%s' not found. Available presets:",

+                   curves->preset);

+            for (i = 0; i < FF_ARRAY_ELEMS(curves_presets); i++)

+                av_log(ctx, AV_LOG_ERROR, " %s", curves_presets[i].name);

+            av_log(ctx, AV_LOG_ERROR, ".\n");

+            return AVERROR(EINVAL);

+        }

+    }

+

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

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

         if (ret < 0)

@@ -48,7 +48,7 @@ FATE_HQDN3D += fate-filter-hqdn3d

 fate-filter-hqdn3d: CMD = framecrc -idct simple -i $(SAMPLES)/smjpeg/scenwin.mjpg -vf perms=random,hqdn3d -an

 FATE_FILTER-$(call ALLYES, SMJPEG_DEMUXER MJPEG_DECODER PERMS_FILTER HQDN3D_FILTER) += $(FATE_HQDN3D)

-fate-filter-curves: CMD = framecrc -i $(SAMPLES)/utvideo/utvideo_rgb_median.avi -vf "perms=random,curves=r=0/0.11@.42/.51@1/0.95:g=0.50/0.48:b=0/0.22@.49/.44@1/0.8"

+fate-filter-curves: CMD = framecrc -i $(SAMPLES)/utvideo/utvideo_rgb_median.avi -vf perms=random,curves=preset=vintage

 FATE_FILTER-$(call ALLYES, UTVIDEO_DECODER AVI_DEMUXER PERMS_FILTER CURVES_FILTER) += fate-filter-curves

 FATE_GRADFUN += fate-filter-gradfun