filter/Internal: rename struct AudioOutput to FilteredAudioOutput

Prepare to add an abstract class AudioOutput, to be implemented by
plugins, to get rid of the C-style vtable.

src/output/plugins/AlsaOutputPlugin.cxx

@@ -64,7 +64,7 @@ class AlsaOutput final
 
 	friend struct AudioOutputWrapper<AlsaOutput>;
 
-	AudioOutput base;
+	FilteredAudioOutput base;
 
 	Manual<PcmExport> pcm_export;
 

src/output/plugins/AoOutputPlugin.cxx

@@ -40,7 +40,7 @@ static unsigned ao_output_ref;
 class AoOutput {
 	friend struct AudioOutputWrapper<AoOutput>;
 
-	AudioOutput base;
+	FilteredAudioOutput base;
 
 	const size_t write_size;
 	int driver;

src/output/plugins/FifoOutputPlugin.cxx

@@ -37,7 +37,7 @@
 class FifoOutput {
 	friend struct AudioOutputWrapper<FifoOutput>;
 
-	AudioOutput base;
+	FilteredAudioOutput base;
 
 	const AllocatedPath path;
 	std::string path_utf8;

src/output/plugins/HaikuOutputPlugin.cxx

@@ -48,7 +48,7 @@ class HaikuOutput {
 	friend int haiku_output_get_volume(HaikuOutput &haiku);
 	friend bool haiku_output_set_volume(HaikuOutput &haiku, unsigned volume);
 
-	AudioOutput base;
+	FilteredAudioOutput base;
 
 	size_t write_size;
 

src/output/plugins/JackOutputPlugin.cxx

@@ -43,7 +43,7 @@ static constexpr unsigned MAX_PORTS = 16;
 static constexpr size_t jack_sample_size = sizeof(jack_default_audio_sample_t);
 
 struct JackOutput {
-	AudioOutput base;
+	FilteredAudioOutput base;
 
 	/**
 	 * libjack options passed to jack_client_open().
@@ -443,7 +443,7 @@ JackOutput::Disable()
 	}
 }
 
-static AudioOutput *
+static FilteredAudioOutput *
 mpd_jack_init(EventLoop &, const ConfigBlock &block)
 {
 	jack_set_error_function(mpd_jack_error);

src/output/plugins/NullOutputPlugin.cxx

@@ -26,7 +26,7 @@
 class NullOutput {
 	friend struct AudioOutputWrapper<NullOutput>;
 
-	AudioOutput base;
+	FilteredAudioOutput base;
 
 	const bool sync;
 

src/output/plugins/OSXOutputPlugin.cxx

@@ -36,7 +36,7 @@
 #include <memory>
 
 struct OSXOutput {
-	AudioOutput base;
+	FilteredAudioOutput base;
 
 	/* configuration settings */
 	OSType component_subtype;
@@ -103,7 +103,7 @@ OSXOutput::OSXOutput(const ConfigBlock &block)
 	sync_sample_rate = block.GetBlockValue("sync_sample_rate", false);
 }
 
-static AudioOutput *
+static FilteredAudioOutput *
 osx_output_init(EventLoop &, const ConfigBlock &block)
 {
 	OSXOutput *oo = new OSXOutput(block);
@@ -128,7 +128,7 @@ osx_output_init(EventLoop &, const ConfigBlock &block)
 }
 
 static void
-osx_output_finish(AudioOutput *ao)
+osx_output_finish(FilteredAudioOutput *ao)
 {
 	OSXOutput *oo = (OSXOutput *)ao;
 
@@ -514,7 +514,7 @@ osx_render(void *vdata,
 }
 
 static void
-osx_output_enable(AudioOutput *ao)
+osx_output_enable(FilteredAudioOutput *ao)
 {
 	char errormsg[1024];
 	OSXOutput *oo = (OSXOutput *)ao;
@@ -550,7 +550,7 @@ osx_output_enable(AudioOutput *ao)
 }
 
 static void
-osx_output_disable(AudioOutput *ao)
+osx_output_disable(FilteredAudioOutput *ao)
 {
 	OSXOutput *oo = (OSXOutput *)ao;
 
@@ -562,7 +562,7 @@ osx_output_disable(AudioOutput *ao)
 }
 
 static void
-osx_output_close(AudioOutput *ao)
+osx_output_close(FilteredAudioOutput *ao)
 {
 	OSXOutput *od = (OSXOutput *)ao;
 
@@ -573,7 +573,7 @@ osx_output_close(AudioOutput *ao)
 }
 
 static void
-osx_output_open(AudioOutput *ao, AudioFormat &audio_format)
+osx_output_open(FilteredAudioOutput *ao, AudioFormat &audio_format)
 {
 	char errormsg[1024];
 	OSXOutput *od = (OSXOutput *)ao;
@@ -663,14 +663,14 @@ osx_output_open(AudioOutput *ao, AudioFormat &audio_format)
 }
 
 static size_t
-osx_output_play(AudioOutput *ao, const void *chunk, size_t size)
+osx_output_play(FilteredAudioOutput *ao, const void *chunk, size_t size)
 {
 	OSXOutput *od = (OSXOutput *)ao;
 	return od->ring_buffer->push((uint8_t *)chunk, size);
 }
 
 static std::chrono::steady_clock::duration
-osx_output_delay(AudioOutput *ao) noexcept
+osx_output_delay(FilteredAudioOutput *ao) noexcept
 {
 	OSXOutput *od = (OSXOutput *)ao;
 	return od->ring_buffer->write_available()

src/output/plugins/OpenALOutputPlugin.cxx

@@ -39,7 +39,7 @@ class OpenALOutput {
 	/* should be enough for buffer size = 2048 */
 	static constexpr unsigned NUM_BUFFERS = 16;
 
-	AudioOutput base;
+	FilteredAudioOutput base;
 
 	const char *device_name;
 	ALCdevice *device;

src/output/plugins/OssOutputPlugin.cxx

@@ -63,7 +63,7 @@
 class OssOutput {
 	friend struct AudioOutputWrapper<OssOutput>;
 
-	AudioOutput base;
+	FilteredAudioOutput base;
 
 #ifdef AFMT_S24_PACKED
 	Manual<PcmExport> pcm_export;

src/output/plugins/PipeOutputPlugin.cxx

@@ -31,7 +31,7 @@
 class PipeOutput {
 	friend struct AudioOutputWrapper<PipeOutput>;
 
-	AudioOutput base;
+	FilteredAudioOutput base;
 
 	const std::string cmd;
 	FILE *fh;

src/output/plugins/PulseOutputPlugin.cxx

@@ -47,7 +47,7 @@
 class PulseOutput {
 	friend struct AudioOutputWrapper<PulseOutput>;
 
-	AudioOutput base;
+	FilteredAudioOutput base;
 
 	const char *name;
 	const char *server;

src/output/plugins/RecorderOutputPlugin.cxx

@@ -45,7 +45,7 @@ static constexpr Domain recorder_domain("recorder");
 class RecorderOutput {
 	friend struct AudioOutputWrapper<RecorderOutput>;
 
-	AudioOutput base;
+	FilteredAudioOutput base;
 
 	/**
 	 * The configured encoder plugin.

src/output/plugins/RoarOutputPlugin.cxx

@@ -39,7 +39,7 @@
 class RoarOutput {
 	friend struct AudioOutputWrapper<RoarOutput>;
 
-	AudioOutput base;
+	FilteredAudioOutput base;
 
 	const std::string host, name;
 
@@ -54,7 +54,7 @@ class RoarOutput {
 public:
 	RoarOutput(const ConfigBlock &block);
 
-	operator AudioOutput *() {
+	operator FilteredAudioOutput *() {
 		return &base;
 	}
 

src/output/plugins/ShoutOutputPlugin.cxx

@@ -40,7 +40,7 @@
 static constexpr unsigned DEFAULT_CONN_TIMEOUT = 2;
 
 struct ShoutOutput final {
-	AudioOutput base;
+	FilteredAudioOutput base;
 
 	shout_t *shout_conn;
 	shout_metadata_t *shout_meta;

src/output/plugins/SndioOutputPlugin.cxx

@@ -47,7 +47,7 @@ static constexpr Domain sndio_output_domain("sndio_output");
 
 class SndioOutput {
 	friend struct AudioOutputWrapper<SndioOutput>;
-	AudioOutput base;
+	FilteredAudioOutput base;
 	const char *const device;
 	const unsigned buffer_time; /* in ms */
 	struct sio_hdl *sio_hdl;

src/output/plugins/SolarisOutputPlugin.cxx

@@ -53,7 +53,7 @@ struct audio_info {
 class SolarisOutput {
 	friend struct AudioOutputWrapper<SolarisOutput>;
 
-	AudioOutput base;
+	FilteredAudioOutput base;
 
 	/* configuration */
 	const char *const device;

src/output/plugins/WinmmOutputPlugin.cxx

@@ -42,7 +42,7 @@ struct WinmmBuffer {
 class WinmmOutput {
 	friend struct AudioOutputWrapper<WinmmOutput>;
 
-	AudioOutput base;
+	FilteredAudioOutput base;
 
 	const UINT device_id;
 	HWAVEOUT handle;

src/output/plugins/httpd/HttpdInternal.hxx

@@ -52,7 +52,7 @@ struct Tag;
 class HttpdOutput final : ServerSocket, DeferredMonitor {
 	friend struct AudioOutputWrapper<HttpdOutput>;
 
-	AudioOutput base;
+	FilteredAudioOutput base;
 
 	/**
 	 * True if the audio output is open and accepts client
@@ -160,7 +160,7 @@ public:
 	static HttpdOutput *Create(EventLoop &event_loop,
 				   const ConfigBlock &block);
 
-	static constexpr HttpdOutput *Cast(AudioOutput *ao) {
+	static constexpr HttpdOutput *Cast(FilteredAudioOutput *ao) {
 		return &ContainerCast(*ao, &HttpdOutput::base);
 	}
 

src/output/plugins/sles/SlesOutputPlugin.cxx

@@ -43,7 +43,7 @@ class SlesOutput {
 	static constexpr unsigned N_BUFFERS = 3;
 	static constexpr size_t BUFFER_SIZE = 65536;
 
-	AudioOutput base;
+	FilteredAudioOutput base;
 
 	SLES::Object engine_object, mix_object, play_object;
 	SLES::Play play;
@@ -89,7 +89,7 @@ class SlesOutput {
 public:
 	SlesOutput(const ConfigBlock &block);
 
-	operator AudioOutput *() {
+	operator FilteredAudioOutput *() {
 		return &base;
 	}