@@ -811,10 +811,7 @@ delogo=x=0:y=0:w=100:h=77:band=10

 Draw a colored box on the input image.

-It accepts the syntax:

-@example

-drawbox=@var{x}:@var{y}:@var{width}:@var{height}:@var{color}

-@end example

+This filter accepts the following options:

 @table @option

@@ -836,7 +833,7 @@ Follow some examples:

 drawbox

 # draw a box with color red and an opacity of 50%

-drawbox=10:20:200:60:red@@0.5"

+drawbox=x=10:y=20:width=200:height=60:color=red@@0.5"

 @end example

 @section drawtext

@@ -26,6 +26,7 @@

 #include "libavutil/colorspace.h"

 #include "libavutil/common.h"

+#include "libavutil/opt.h"

 #include "libavutil/pixdesc.h"

 #include "libavutil/parseutils.h"

 #include "avfilter.h"

@@ -36,7 +37,9 @@

 enum { Y, U, V, A };

 typedef struct {

+    const AVClass *class;

     int x, y, w, h;

+    char *color_str;

     unsigned char yuv_color[4];

     int vsub, hsub;   ///< chroma subsampling

 } DrawBoxContext;

@@ -44,16 +47,9 @@ typedef struct {

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

 {

     DrawBoxContext *drawbox= ctx->priv;

-    char color_str[1024] = "black";

     uint8_t rgba_color[4];

-    drawbox->x = drawbox->y = drawbox->w = drawbox->h = 0;

-

-    if (args)

-        sscanf(args, "%d:%d:%d:%d:%s",

-               &drawbox->x, &drawbox->y, &drawbox->w, &drawbox->h, color_str);

-

-    if (av_parse_color(rgba_color, color_str, -1, ctx) < 0)

+    if (av_parse_color(rgba_color, drawbox->color_str, -1, ctx) < 0)

         return AVERROR(EINVAL);

     drawbox->yuv_color[Y] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]);

@@ -124,6 +120,24 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)

     return ff_filter_frame(inlink->dst->outputs[0], frame);

 }

+#define OFFSET(x) offsetof(DrawBoxContext, x)

+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM

+static const AVOption options[] = {

+    { "x",      "Horizontal position of the left box edge", OFFSET(x),         AV_OPT_TYPE_INT,    { .i64 = 0 }, INT_MIN, INT_MAX, FLAGS },

+    { "y",      "Vertical position of the top box edge",    OFFSET(y),         AV_OPT_TYPE_INT,    { .i64 = 0 }, INT_MIN, INT_MAX, FLAGS },

+    { "width",  "Width of the box",                         OFFSET(w),         AV_OPT_TYPE_INT,    { .i64 = 0 }, 0,       INT_MAX, FLAGS },

+    { "height", "Height of the box",                        OFFSET(h),         AV_OPT_TYPE_INT,    { .i64 = 0 }, 0,       INT_MAX, FLAGS },

+    { "color",  "Color of the box",                         OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" },    .flags = FLAGS },

+    { NULL },

+};

+

+static const AVClass drawbox_class = {

+    .class_name = "drawbox",

+    .item_name  = av_default_item_name,

+    .option     = options,

+    .version    = LIBAVUTIL_VERSION_INT,

+};

+

 static const AVFilterPad avfilter_vf_drawbox_inputs[] = {

     {

         .name             = "default",

@@ -148,6 +162,7 @@ AVFilter avfilter_vf_drawbox = {

     .name      = "drawbox",

     .description = NULL_IF_CONFIG_SMALL("Draw a colored box on the input video."),

     .priv_size = sizeof(DrawBoxContext),

+    .priv_class = &drawbox_class,

     .init      = init,

     .query_formats   = query_formats,