@@ -2350,6 +2350,18 @@ hue=PI/2:1

 @end example

 @end itemize

+@subsection Commands

+

+This filter supports the following command:

+@table @option

+@item reinit

+Modify the hue and/or the saturation of the input video.

+The command accepts the same named options and syntax than when calling the

+filter from the command-line.

+

+If a parameter is omitted, it is kept at its current value.

+@end table

+

 @section idet

 Interlaceing detect filter. This filter tries to detect if the input is

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

 #define LIBAVFILTER_VERSION_MAJOR  3

 #define LIBAVFILTER_VERSION_MINOR  15

-#define LIBAVFILTER_VERSION_MICRO 100

+#define LIBAVFILTER_VERSION_MICRO 101

 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

                                                LIBAVFILTER_VERSION_MINOR, \

@@ -63,19 +63,19 @@ static const AVOption hue_options[] = {

 AVFILTER_DEFINE_CLASS(hue);

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

+static inline int set_options(AVFilterContext *ctx, const char *args)

 {

     HueContext *hue = ctx->priv;

     int n, ret;

     char c1 = 0, c2 = 0;

     char *equal;

-    hue->class = &hue_class;

-    av_opt_set_defaults(hue);

-

     if (args) {

         /* named options syntax */

         if (equal = strchr(args, '=')) {

+            hue->hue     = -FLT_MAX;

+            hue->hue_deg = -FLT_MAX;

+

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

                 return ret;

             if (hue->hue != -FLT_MAX && hue->hue_deg != -FLT_MAX) {

@@ -103,6 +103,20 @@ static av_cold int init(AVFilterContext *ctx, const char *args)

         }

     }

+    return 0;

+}

+

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

+{

+    HueContext *hue = ctx->priv;

+    int ret;

+

+    hue->class = &hue_class;

+    av_opt_set_defaults(hue);

+

+    if ((ret = set_options(ctx, args)) < 0)

+        return ret;

+

     if (hue->saturation == -FLT_MAX)

         hue->hue = SAT_DEFAULT_VAL;

     if (hue->hue == -FLT_MAX)

@@ -223,6 +237,28 @@ static int draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)

     return ff_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);

 }

+static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,

+                           char *res, int res_len, int flags)

+{

+    HueContext *hue = ctx->priv;

+    int ret;

+

+    if (!strcmp(cmd, "reinit")) {

+        if ((ret = set_options(ctx, args)) < 0)

+            return ret;

+

+        if (hue->hue_deg != -FLT_MAX)

+            /* Convert angle from degrees to radians */

+            hue->hue = hue->hue_deg * M_PI / 180;

+

+        hue->hue_sin = rint(sin(hue->hue) * (1 << 16) * hue->saturation);

+        hue->hue_cos = rint(cos(hue->hue) * (1 << 16) * hue->saturation);

+    } else

+        return AVERROR(ENOSYS);

+

+    return 0;

+}

+

 AVFilter avfilter_vf_hue = {

     .name        = "hue",

     .description = NULL_IF_CONFIG_SMALL("Adjust the hue and saturation of the input video."),

@@ -232,6 +268,7 @@ AVFilter avfilter_vf_hue = {

     .init          = init,

     .uninit        = uninit,

     .query_formats = query_formats,

+    .process_command = process_command,

     .inputs = (const AVFilterPad[]) {

         {