lavfi/colormatrix: switch to an AVOptions-based system.

doc/filters.texi

@@ -2102,12 +2102,8 @@ boxblur=luma_radius=min(h\,w)/10:luma_power=1:chroma_radius=min(cw\,ch)/10:chrom
 
 Convert color matrix.
 
-The filter accepts parameters as a list of @var{key}=@var{value}
-pairs, separated by ":". If the key of the first options is omitted,
-the arguments are interpreted according to the syntax
-@var{src}:@var{dst}.
+The filter accepts the following options:
 
-A description of the accepted options follows:
 @table @option
 @item src
 @item dst

libavfilter/avfilter.c

@@ -659,6 +659,7 @@ int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque
         !strcmp(filter->filter->name,  "aformat") ||
         !strcmp(filter->filter->name,  "blackframe") ||
         !strcmp(filter->filter->name,  "boxblur"   ) ||
+        !strcmp(filter->filter->name,  "colormatrix") ||
         !strcmp(filter->filter->name,  "crop"      ) ||
         !strcmp(filter->filter->name,  "cropdetect") ||
         !strcmp(filter->filter->name,  "delogo"    ) ||

libavfilter/vf_colormatrix.c

@@ -375,8 +375,6 @@ static const AVFilterPad colormatrix_outputs[] = {
     { NULL }
 };
 
-static const char *const shorthand[] = { "src", "dst", NULL };
-
 AVFilter avfilter_vf_colormatrix = {
     .name          = "colormatrix",
     .description   = NULL_IF_CONFIG_SMALL("Convert color matrix."),
@@ -387,5 +385,4 @@ AVFilter avfilter_vf_colormatrix = {
     .inputs        = colormatrix_inputs,
     .outputs       = colormatrix_outputs,
     .priv_class    = &colormatrix_class,
-    .shorthand     = shorthand,
 };