5 files changed, 24 insertions, 20 deletions
diff --git a/src/filter/ChainFilterPlugin.cxx b/src/filter/ChainFilterPlugin.cxx
index cb52b86ca..b000d53ce 100644
--- a/src/filter/ChainFilterPlugin.cxx
+++ b/src/filter/ChainFilterPlugin.cxx
@@ -52,10 +52,11 @@ public:
 		children.emplace_back(name, filter);
 	}
 
-	virtual AudioFormat Open(AudioFormat &af, Error &error) override;
-	virtual void Close();
-	virtual const void *FilterPCM(const void *src, size_t src_size,
-				      size_t *dest_size_r, Error &error);
+	/* virtual methods from class Filter */
+	AudioFormat Open(AudioFormat &af, Error &error) override;
+	void Close() override;
+	const void *FilterPCM(const void *src, size_t src_size,
+			      size_t *dest_size_r, Error &error) override;
 
 private:
 	/**
diff --git a/src/filter/NormalizeFilterPlugin.cxx b/src/filter/NormalizeFilterPlugin.cxx
index 6c4f6b0e5..60d0f3204 100644
--- a/src/filter/NormalizeFilterPlugin.cxx
+++ b/src/filter/NormalizeFilterPlugin.cxx
@@ -34,10 +34,11 @@ class NormalizeFilter final : public Filter {
 	PcmBuffer buffer;
 
 public:
-	virtual AudioFormat Open(AudioFormat &af, Error &error) override;
-	virtual void Close();
-	virtual const void *FilterPCM(const void *src, size_t src_size,
-				      size_t *dest_size_r, Error &error);
+	/* virtual methods from class Filter */
+	AudioFormat Open(AudioFormat &af, Error &error) override;
+	void Close() override;
+	const void *FilterPCM(const void *src, size_t src_size,
+			      size_t *dest_size_r, Error &error) override;
 };
 
 static Filter *
diff --git a/src/filter/ReplayGainFilterPlugin.cxx b/src/filter/ReplayGainFilterPlugin.cxx
index b2dcde4cc..b79b4fb87 100644
--- a/src/filter/ReplayGainFilterPlugin.cxx
+++ b/src/filter/ReplayGainFilterPlugin.cxx
@@ -116,10 +116,11 @@ public:
 	 */
 	void Update();
 
-	virtual AudioFormat Open(AudioFormat &af, Error &error) override;
-	virtual void Close();
-	virtual const void *FilterPCM(const void *src, size_t src_size,
-				      size_t *dest_size_r, Error &error);
+	/* virtual methods from class Filter */
+	AudioFormat Open(AudioFormat &af, Error &error) override;
+	void Close() override;
+	const void *FilterPCM(const void *src, size_t src_size,
+			      size_t *dest_size_r, Error &error) override;
 };
 
 void
diff --git a/src/filter/RouteFilterPlugin.cxx b/src/filter/RouteFilterPlugin.cxx
index d9042c21f..335cfe6bd 100644
--- a/src/filter/RouteFilterPlugin.cxx
+++ b/src/filter/RouteFilterPlugin.cxx
@@ -120,10 +120,11 @@ public:
 	 */
 	bool Configure(const config_param &param, Error &error);
 
-	virtual AudioFormat Open(AudioFormat &af, Error &error) override;
-	virtual void Close();
-	virtual const void *FilterPCM(const void *src, size_t src_size,
-				      size_t *dest_size_r, Error &error);
+	/* virtual methods from class Filter */
+	AudioFormat Open(AudioFormat &af, Error &error) override;
+	void Close() override;
+	const void *FilterPCM(const void *src, size_t src_size,
+			      size_t *dest_size_r, Error &error) override;
 };
 
 bool
diff --git a/src/filter/VolumeFilterPlugin.cxx b/src/filter/VolumeFilterPlugin.cxx
index 1b663f6eb..66afdea88 100644
--- a/src/filter/VolumeFilterPlugin.cxx
+++ b/src/filter/VolumeFilterPlugin.cxx
@@ -57,10 +57,10 @@ public:
 		volume = _volume;
 	}
 
-	virtual AudioFormat Open(AudioFormat &af, Error &error) override;
-	virtual void Close();
-	virtual const void *FilterPCM(const void *src, size_t src_size,
-				      size_t *dest_size_r, Error &error);
+	AudioFormat Open(AudioFormat &af, Error &error) override;
+	void Close() override;
+	const void *FilterPCM(const void *src, size_t src_size,
+			      size_t *dest_size_r, Error &error) override;
 };
 
 static constexpr Domain volume_domain("pcm_volume");