MixerPlugin: add EventLoop& init() parameter

src/output/Init.cxx

@@ -112,7 +112,7 @@ audio_output_mixer_type(const config_param &param)
 }
 
 static Mixer *
-audio_output_load_mixer(AudioOutput *ao,
+audio_output_load_mixer(EventLoop &event_loop, AudioOutput *ao,
 			const config_param &param,
 			const struct mixer_plugin *plugin,
 			Filter &filter_chain,
@@ -129,10 +129,10 @@ audio_output_load_mixer(AudioOutput *ao,
 		if (plugin == nullptr)
 			return nullptr;
 
-		return mixer_new(plugin, ao, param, error);
+		return mixer_new(event_loop, plugin, ao, param, error);
 
 	case MIXER_TYPE_SOFTWARE:
-		mixer = mixer_new(&software_mixer_plugin, nullptr,
+		mixer = mixer_new(event_loop, &software_mixer_plugin, nullptr,
 				  config_param(),
 				  IgnoreError());
 		assert(mixer != nullptr);
@@ -211,7 +211,8 @@ AudioOutput::Configure(const config_param &param, Error &error)
 }
 
 static bool
-audio_output_setup(AudioOutput *ao, const config_param &param,
+audio_output_setup(EventLoop &event_loop, AudioOutput *ao,
+		   const config_param &param,
 		   Error &error)
 {
 
@@ -241,7 +242,7 @@ audio_output_setup(AudioOutput *ao, const config_param &param,
 	/* set up the mixer */
 
 	Error mixer_error;
-	ao->mixer = audio_output_load_mixer(ao, param,
+	ao->mixer = audio_output_load_mixer(event_loop, ao, param,
 					    ao->plugin.mixer_plugin,
 					    *ao->filter, mixer_error);
 	if (ao->mixer == nullptr && mixer_error.IsDefined())
@@ -277,7 +278,7 @@ audio_output_setup(AudioOutput *ao, const config_param &param,
 }
 
 AudioOutput *
-audio_output_new(const config_param &param,
+audio_output_new(EventLoop &event_loop, const config_param &param,
 		 PlayerControl &pc,
 		 Error &error)
 {
@@ -316,7 +317,7 @@ audio_output_new(const config_param &param,
 	if (ao == nullptr)
 		return nullptr;
 
-	if (!audio_output_setup(ao, param, error)) {
+	if (!audio_output_setup(event_loop, ao, param, error)) {
 		ao_plugin_finish(ao);
 		return nullptr;
 	}

src/output/Internal.hxx

@@ -32,6 +32,7 @@
 class Error;
 class Filter;
 class MusicPipe;
+class EventLoop;
 struct music_chunk;
 struct config_param;
 struct PlayerControl;
@@ -422,7 +423,7 @@ private:
 extern struct notify audio_output_client_notify;
 
 AudioOutput *
-audio_output_new(const config_param &param,
+audio_output_new(EventLoop &event_loop, const config_param &param,
 		 PlayerControl &pc,
 		 Error &error);
 

src/output/MultipleOutputs.cxx

@@ -50,10 +50,10 @@ MultipleOutputs::~MultipleOutputs()
 }
 
 static AudioOutput *
-LoadOutput(PlayerControl &pc, const config_param &param)
+LoadOutput(EventLoop &event_loop, PlayerControl &pc, const config_param &param)
 {
 	Error error;
-	AudioOutput *output = audio_output_new(param, pc, error);
+	AudioOutput *output = audio_output_new(event_loop, param, pc, error);
 	if (output == nullptr) {
 		if (param.line > 0)
 			FormatFatalError("line %i: %s",
@@ -67,12 +67,12 @@ LoadOutput(PlayerControl &pc, const config_param &param)
 }
 
 void
-MultipleOutputs::Configure(PlayerControl &pc)
+MultipleOutputs::Configure(EventLoop &event_loop, PlayerControl &pc)
 {
 	const config_param *param = nullptr;
 	while ((param = config_get_next_param(CONF_AUDIO_OUTPUT,
 					      param)) != nullptr) {
-		auto output = LoadOutput(pc, *param);
+		auto output = LoadOutput(event_loop, pc, *param);
 		if (FindByName(output->name) != nullptr)
 			FormatFatalError("output devices with identical "
 					 "names: %s", output->name);
@@ -83,7 +83,7 @@ MultipleOutputs::Configure(PlayerControl &pc)
 	if (outputs.empty()) {
 		/* auto-detect device */
 		const config_param empty;
-		auto output = LoadOutput(pc, empty);
+		auto output = LoadOutput(event_loop, pc, empty);
 		outputs.push_back(output);
 	}
 }

src/output/MultipleOutputs.hxx

@@ -37,6 +37,7 @@
 struct AudioFormat;
 class MusicBuffer;
 class MusicPipe;
+class EventLoop;
 struct music_chunk;
 struct PlayerControl;
 struct AudioOutput;
@@ -72,7 +73,7 @@ public:
 	MultipleOutputs();
 	~MultipleOutputs();
 
-	void Configure(PlayerControl &pc);
+	void Configure(EventLoop &event_loop, PlayerControl &pc);
 
 	/**
 	 * Returns the total number of audio output devices, including