output/Filtered: add a few OutputPlugin method wrappers

src/output/Filtered.cxx

@@ -101,9 +101,9 @@ void
 FilteredAudioOutput::CloseOutput(bool drain) noexcept
 {
 	if (drain)
-		ao_plugin_drain(*this);
+		Drain();
 	else
-		ao_plugin_cancel(*this);
+		Cancel();
 
 	ao_plugin_close(*this);
 }
@@ -131,12 +131,42 @@ FilteredAudioOutput::Close(bool drain) noexcept
 	FormatDebug(output_domain, "closed %s", GetLogName());
 }
 
+std::chrono::steady_clock::duration
+FilteredAudioOutput::Delay() noexcept
+{
+	return ao_plugin_delay(*this);
+}
+
 void
-FilteredAudioOutput::BeginPause() noexcept
+FilteredAudioOutput::SendTag(const Tag &tag)
+{
+	ao_plugin_send_tag(*this, tag);
+}
+
+size_t
+FilteredAudioOutput::Play(const void *data, size_t size)
+{
+	return ao_plugin_play(*this, data, size);
+}
+
+void
+FilteredAudioOutput::Drain()
+{
+	ao_plugin_drain(*this);
+}
+
+void
+FilteredAudioOutput::Cancel() noexcept
 {
 	ao_plugin_cancel(*this);
 }
 
+void
+FilteredAudioOutput::BeginPause() noexcept
+{
+	Cancel();
+}
+
 bool
 FilteredAudioOutput::IteratePause() noexcept
 {

src/output/Filtered.hxx

@@ -24,6 +24,7 @@
 #include "filter/Observer.hxx"
 
 #include <string>
+#include <chrono>
 
 class PreparedFilter;
 class MusicPipe;
@@ -34,6 +35,7 @@ struct MusicChunk;
 struct ConfigBlock;
 struct AudioOutputPlugin;
 struct ReplayGainConfig;
+struct Tag;
 
 struct FilteredAudioOutput {
 	/**
@@ -186,6 +188,16 @@ public:
 	 */
 	void CloseSoftwareMixer() noexcept;
 
+	gcc_pure
+	std::chrono::steady_clock::duration Delay() noexcept;
+
+	void SendTag(const Tag &tag);
+
+	size_t Play(const void *data, size_t size);
+
+	void Drain();
+	void Cancel() noexcept;
+
 	void BeginPause() noexcept;
 	bool IteratePause() noexcept;
 

src/output/Thread.cxx

@@ -21,7 +21,6 @@
 #include "Control.hxx"
 #include "Filtered.hxx"
 #include "Client.hxx"
-#include "OutputPlugin.hxx"
 #include "Domain.hxx"
 #include "notify.hxx"
 #include "mixer/MixerInternal.hxx"
@@ -217,7 +216,7 @@ inline bool
 AudioOutputControl::WaitForDelay() noexcept
 {
 	while (true) {
-		const auto delay = ao_plugin_delay(*output);
+		const auto delay = output->Delay();
 		if (delay <= std::chrono::steady_clock::duration::zero())
 			return true;
 
@@ -251,7 +250,7 @@ AudioOutputControl::PlayChunk() noexcept
 		if (tag != nullptr) {
 			const ScopeUnlock unlock(mutex);
 			try {
-				ao_plugin_send_tag(*output, *tag);
+				output->SendTag(*tag);
 			} catch (const std::runtime_error &e) {
 				FormatError(e, "Failed to send tag to %s",
 					    GetLogName());
@@ -273,7 +272,7 @@ AudioOutputControl::PlayChunk() noexcept
 
 		try {
 			const ScopeUnlock unlock(mutex);
-			nbytes = ao_plugin_play(*output, data.data, data.size);
+			nbytes = output->Play(data.data, data.size);
 			assert(nbytes <= data.size);
 		} catch (const std::runtime_error &e) {
 			FormatError(e, "Failed to play on %s", GetLogName());
@@ -438,7 +437,7 @@ AudioOutputControl::Task()
 		case Command::DRAIN:
 			if (open) {
 				const ScopeUnlock unlock(mutex);
-				ao_plugin_drain(*output);
+				output->Drain();
 			}
 
 			CommandFinished();
@@ -449,7 +448,7 @@ AudioOutputControl::Task()
 
 			if (open) {
 				const ScopeUnlock unlock(mutex);
-				ao_plugin_cancel(*output);
+				output->Cancel();
 			}
 
 			CommandFinished();