avfilter/vf_format: Deduplicate AVClasses

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavfilter/vf_format.c

@@ -140,10 +140,9 @@ static const AVOption options[] = {
     { NULL }
 };
 
-#if CONFIG_FORMAT_FILTER
+AVFILTER_DEFINE_CLASS_EXT(format, "(no)format", options);
 
-#define format_options options
-AVFILTER_DEFINE_CLASS(format);
+#if CONFIG_FORMAT_FILTER
 
 static const AVFilterPad avfilter_vf_format_inputs[] = {
     {
@@ -179,9 +178,6 @@ const AVFilter ff_vf_format = {
 
 #if CONFIG_NOFORMAT_FILTER
 
-#define noformat_options options
-AVFILTER_DEFINE_CLASS(noformat);
-
 static const AVFilterPad avfilter_vf_noformat_inputs[] = {
     {
         .name             = "default",
@@ -200,6 +196,7 @@ static const AVFilterPad avfilter_vf_noformat_outputs[] = {
 const AVFilter ff_vf_noformat = {
     .name          = "noformat",
     .description   = NULL_IF_CONFIG_SMALL("Force libavfilter not to use any of the specified pixel formats for the input to the next filter."),
+    .priv_class    = &format_class,
 
     .init          = init,
     .uninit        = uninit,
@@ -207,7 +204,6 @@ const AVFilter ff_vf_noformat = {
     .query_formats = query_formats,
 
     .priv_size     = sizeof(FormatContext),
-    .priv_class    = &noformat_class,
 
     FILTER_INPUTS(avfilter_vf_noformat_inputs),
     FILTER_OUTPUTS(avfilter_vf_noformat_outputs),