filter/Filter: add "noexcept"

src/filter/Filter.hxx

@@ -30,25 +30,25 @@ class Filter {
 protected:
 	AudioFormat out_audio_format;
 
-	explicit Filter(AudioFormat _out_audio_format)
+	explicit Filter(AudioFormat _out_audio_format) noexcept
 		:out_audio_format(_out_audio_format) {
 		assert(out_audio_format.IsValid());
 	}
 
 public:
-	virtual ~Filter() {}
+	virtual ~Filter() noexcept {}
 
 	/**
 	 * Returns the #AudioFormat produced by FilterPCM().
 	 */
-	const AudioFormat &GetOutAudioFormat() const {
+	const AudioFormat &GetOutAudioFormat() const noexcept {
 		return out_audio_format;
 	}
 
 	/**
 	 * Reset the filter's state, e.g. drop/flush buffers.
 	 */
-	virtual void Reset() {
+	virtual void Reset() noexcept {
 	}
 
 	/**

src/filter/plugins/AutoConvertFilterPlugin.cxx

@@ -49,7 +49,7 @@ public:
 		:Filter(_filter->GetOutAudioFormat()),
 		 filter(std::move(_filter)), convert(std::move(_convert)) {}
 
-	void Reset() override {
+	void Reset() noexcept override {
 		filter->Reset();
 
 		if (convert)

src/filter/plugins/ChainFilterPlugin.cxx

@@ -36,7 +36,8 @@ class ChainFilter final : public Filter {
 		const char *name;
 		std::unique_ptr<Filter> filter;
 
-		Child(const char *_name, std::unique_ptr<Filter> _filter)
+		Child(const char *_name,
+		      std::unique_ptr<Filter> _filter) noexcept
 			:name(_name), filter(std::move(_filter)) {}
 	};
 
@@ -46,7 +47,8 @@ public:
 	explicit ChainFilter(AudioFormat _audio_format)
 		:Filter(_audio_format) {}
 
-	void Append(const char *name, std::unique_ptr<Filter> filter) {
+	void Append(const char *name,
+		    std::unique_ptr<Filter> filter) noexcept {
 		assert(out_audio_format.IsValid());
 		out_audio_format = filter->GetOutAudioFormat();
 		assert(out_audio_format.IsValid());
@@ -55,7 +57,7 @@ public:
 	}
 
 	/* virtual methods from class Filter */
-	void Reset() override;
+	void Reset() noexcept override;
 	ConstBuffer<void> FilterPCM(ConstBuffer<void> src) override;
 };
 
@@ -114,7 +116,7 @@ PreparedChainFilter::Open(AudioFormat &in_audio_format)
 }
 
 void
-ChainFilter::Reset()
+ChainFilter::Reset() noexcept
 {
 	for (auto &child : children)
 		child.filter->Reset();

src/filter/plugins/ConvertFilterPlugin.cxx

@@ -50,7 +50,7 @@ public:
 
 	void Set(const AudioFormat &_out_audio_format);
 
-	void Reset() override {
+	void Reset() noexcept override {
 		state.Reset();
 	}