filter/Plugin: rename with CamelCase

src/filter/plugins/ChainFilterPlugin.cxx

@@ -143,7 +143,7 @@ ChainFilter::FilterPCM(ConstBuffer<void> src)
 	return src;
 }
 
-const struct filter_plugin chain_filter_plugin = {
+const FilterPlugin chain_filter_plugin = {
 	"chain",
 	chain_filter_init,
 };

src/filter/plugins/ConvertFilterPlugin.cxx

@@ -125,7 +125,7 @@ ConvertFilter::FilterPCM(ConstBuffer<void> src)
 	return state.Convert(src);
 }
 
-const struct filter_plugin convert_filter_plugin = {
+const FilterPlugin convert_filter_plugin = {
 	"convert",
 	convert_filter_init,
 };

src/filter/plugins/NormalizeFilterPlugin.cxx

@@ -76,7 +76,7 @@ NormalizeFilter::FilterPCM(ConstBuffer<void> src)
 	return { (const void *)dest, src.size };
 }
 
-const struct filter_plugin normalize_filter_plugin = {
+const FilterPlugin normalize_filter_plugin = {
 	"normalize",
 	normalize_filter_init,
 };

src/filter/plugins/NullFilterPlugin.cxx

@@ -54,7 +54,7 @@ null_filter_init(gcc_unused const ConfigBlock &block)
 	return new PreparedNullFilter();
 }
 
-const struct filter_plugin null_filter_plugin = {
+const FilterPlugin null_filter_plugin = {
 	"null",
 	null_filter_init,
 };

src/filter/plugins/ReplayGainFilterPlugin.cxx

@@ -186,7 +186,7 @@ ReplayGainFilter::FilterPCM(ConstBuffer<void> src)
 		: pv.Apply(src);
 }
 
-const struct filter_plugin replay_gain_filter_plugin = {
+const FilterPlugin replay_gain_filter_plugin = {
 	"replay_gain",
 	replay_gain_filter_init,
 };

src/filter/plugins/RouteFilterPlugin.cxx

@@ -272,7 +272,7 @@ RouteFilter::FilterPCM(ConstBuffer<void> src)
 	return { result, result_size };
 }
 
-const struct filter_plugin route_filter_plugin = {
+const FilterPlugin route_filter_plugin = {
 	"route",
 	route_filter_init,
 };

src/filter/plugins/VolumeFilterPlugin.cxx

@@ -75,7 +75,7 @@ VolumeFilter::FilterPCM(ConstBuffer<void> src)
 	return pv.Apply(src);
 }
 
-const struct filter_plugin volume_filter_plugin = {
+const FilterPlugin volume_filter_plugin = {
 	"volume",
 	volume_filter_init,
 };