output/Init: pass global configuration in struct AudioOutputDefaults

Makefile.am

@@ -1551,6 +1551,7 @@ OUTPUT_LIBS = \
 	$(SHOUT_LIBS)
 
 OUTPUT_API_SRC = \
+	src/output/Defaults.cxx src/output/Defaults.hxx \
 	src/output/Client.hxx \
 	src/output/OutputAPI.hxx \
 	src/output/Filtered.cxx src/output/Filtered.hxx \

src/output/Defaults.cxx

+/*
+ * Copyright 2003-2018 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "Defaults.hxx"
+#include "config/Data.hxx"
+#include "mixer/MixerType.hxx"
+
+AudioOutputDefaults::AudioOutputDefaults(const ConfigData &config)
+	:normalize(config.GetBool(ConfigOption::VOLUME_NORMALIZATION, false)),
+	 mixer_type(mixer_type_parse(config.GetString(ConfigOption::MIXER_TYPE,
+						      "hardware")))
+
+{
+}

src/output/Defaults.hxx

+/*
+ * Copyright 2003-2018 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_AUDIO_OUTPUT_DEFAULTS_HXX
+#define MPD_AUDIO_OUTPUT_DEFAULTS_HXX
+
+#include "check.h"
+#include "mixer/MixerType.hxx"
+
+struct ConfigData;
+
+/**
+ * This struct contains global AudioOutput configuration settings
+ * which may provide defaults for per-output settings.
+ */
+struct AudioOutputDefaults {
+	bool normalize = false;
+
+	MixerType mixer_type = MixerType::HARDWARE;
+
+	constexpr AudioOutputDefaults() = default;
+
+	/**
+	 * Load defaults from configuration file.
+	 *
+	 * Throws on error.
+	 */
+	explicit AudioOutputDefaults(const ConfigData &config);
+};
+
+#endif

src/output/Filtered.hxx

@@ -38,6 +38,7 @@ struct MixerPlugin;
 struct MusicChunk;
 struct ConfigBlock;
 class AudioOutput;
+struct AudioOutputDefaults;
 struct ReplayGainConfig;
 struct Tag;
 
@@ -129,12 +130,14 @@ public:
 	FilteredAudioOutput(const char *_plugin_name,
 			    std::unique_ptr<AudioOutput> &&_output,
 			    const ConfigBlock &block,
+			    const AudioOutputDefaults &defaults,
 			    FilterFactory *filter_factory);
 
 	~FilteredAudioOutput();
 
 private:
 	void Configure(const ConfigBlock &block,
+		       const AudioOutputDefaults &defaults,
 		       FilterFactory *filter_factory);
 
 public:
@@ -142,7 +145,8 @@ public:
 		   const ReplayGainConfig &replay_gain_config,
 		   const MixerPlugin *mixer_plugin,
 		   MixerListener &mixer_listener,
-		   const ConfigBlock &block);
+		   const ConfigBlock &block,
+		   const AudioOutputDefaults &defaults);
 
 	const char *GetName() const {
 		return name;
@@ -238,6 +242,7 @@ std::unique_ptr<FilteredAudioOutput>
 audio_output_new(EventLoop &event_loop,
 		 const ReplayGainConfig &replay_gain_config,
 		 const ConfigBlock &block,
+		 const AudioOutputDefaults &defaults,
 		 FilterFactory *filter_factory,
 		 MixerListener &mixer_listener);
 

src/output/Init.cxx

@@ -22,6 +22,7 @@
 #include "Registry.hxx"
 #include "Domain.hxx"
 #include "OutputAPI.hxx"
+#include "Defaults.hxx"
 #include "AudioParser.hxx"
 #include "mixer/MixerList.hxx"
 #include "mixer/MixerType.hxx"
@@ -36,7 +37,7 @@
 #include "filter/plugins/VolumeFilterPlugin.hxx"
 #include "filter/plugins/NormalizeFilterPlugin.hxx"
 #include "config/Domain.hxx"
-#include "config/Global.hxx"
+#include "config/Option.hxx"
 #include "config/Block.hxx"
 #include "util/RuntimeError.hxx"
 #include "util/StringFormat.hxx"
@@ -55,10 +56,11 @@
 FilteredAudioOutput::FilteredAudioOutput(const char *_plugin_name,
 					 std::unique_ptr<AudioOutput> &&_output,
 					 const ConfigBlock &block,
+					 const AudioOutputDefaults &defaults,
 					 FilterFactory *filter_factory)
 	:plugin_name(_plugin_name), output(std::move(_output))
 {
-	Configure(block, filter_factory);
+	Configure(block, defaults, filter_factory);
 }
 
 static const AudioOutputPlugin *
@@ -88,7 +90,8 @@ audio_output_detect()
  * mixer_enabled, if the mixer_type setting is not configured.
  */
 static MixerType
-audio_output_mixer_type(const ConfigBlock &block)
+audio_output_mixer_type(const ConfigBlock &block,
+			const AudioOutputDefaults &defaults)
 {
 	/* read the local "mixer_type" setting */
 	const char *p = block.GetBlockValue("mixer_type");
@@ -101,20 +104,20 @@ audio_output_mixer_type(const ConfigBlock &block)
 
 	/* fall back to the global "mixer_type" setting (also
 	   deprecated) */
-	return mixer_type_parse(config_get_string(ConfigOption::MIXER_TYPE,
-						  "hardware"));
+	return defaults.mixer_type;
 }
 
 static Mixer *
 audio_output_load_mixer(EventLoop &event_loop, FilteredAudioOutput &ao,
 			const ConfigBlock &block,
+			const AudioOutputDefaults &defaults,
 			const MixerPlugin *plugin,
 			PreparedFilter &filter_chain,
 			MixerListener &listener)
 {
 	Mixer *mixer;
 
-	switch (audio_output_mixer_type(block)) {
+	switch (audio_output_mixer_type(block, defaults)) {
 	case MixerType::NONE:
 		return nullptr;
 
@@ -148,6 +151,7 @@ audio_output_load_mixer(EventLoop &event_loop, FilteredAudioOutput &ao,
 
 void
 FilteredAudioOutput::Configure(const ConfigBlock &block,
+			       const AudioOutputDefaults &defaults,
 			       FilterFactory *filter_factory)
 {
 	if (!block.IsNull()) {
@@ -175,7 +179,7 @@ FilteredAudioOutput::Configure(const ConfigBlock &block,
 
 	/* create the normalization filter (if configured) */
 
-	if (config_get_bool(ConfigOption::VOLUME_NORMALIZATION, false)) {
+	if (defaults.normalize) {
 		filter_chain_append(*prepared_filter, "normalize",
 				    autoconvert_filter_new(normalize_filter_prepare()));
 	}
@@ -199,7 +203,8 @@ FilteredAudioOutput::Setup(EventLoop &event_loop,
 			   const ReplayGainConfig &replay_gain_config,
 			   const MixerPlugin *mixer_plugin,
 			   MixerListener &mixer_listener,
-			   const ConfigBlock &block)
+			   const ConfigBlock &block,
+			   const AudioOutputDefaults &defaults)
 {
 	if (output->GetNeedFullyDefinedAudioFormat() &&
 	    !config_audio_format.IsFullyDefined())
@@ -224,6 +229,7 @@ FilteredAudioOutput::Setup(EventLoop &event_loop,
 
 	try {
 		mixer = audio_output_load_mixer(event_loop, *this, block,
+						defaults,
 						mixer_plugin,
 						*prepared_filter,
 						mixer_listener);
@@ -257,6 +263,7 @@ std::unique_ptr<FilteredAudioOutput>
 audio_output_new(EventLoop &event_loop,
 		 const ReplayGainConfig &replay_gain_config,
 		 const ConfigBlock &block,
+		 const AudioOutputDefaults &defaults,
 		 FilterFactory *filter_factory,
 		 MixerListener &mixer_listener)
 {
@@ -289,9 +296,10 @@ audio_output_new(EventLoop &event_loop,
 
 	auto f = std::make_unique<FilteredAudioOutput>(plugin->name,
 						       std::move(ao), block,
+						       defaults,
 						       filter_factory);
 	f->Setup(event_loop, replay_gain_config,
 		 plugin->mixer_plugin,
-		 mixer_listener, block);
+		 mixer_listener, block, defaults);
 	return f;
 }

src/output/MultipleOutputs.cxx

@@ -20,6 +20,7 @@
 #include "config.h"
 #include "MultipleOutputs.hxx"
 #include "Filtered.hxx"
+#include "Defaults.hxx"
 #include "Domain.hxx"
 #include "MusicPipe.hxx"
 #include "MusicChunk.hxx"
@@ -53,9 +54,11 @@ LoadOutput(EventLoop &event_loop,
 	   const ReplayGainConfig &replay_gain_config,
 	   MixerListener &mixer_listener,
 	   const ConfigBlock &block,
+	   const AudioOutputDefaults &defaults,
 	   FilterFactory *filter_factory)
 try {
 	return audio_output_new(event_loop, replay_gain_config, block,
+				defaults,
 				filter_factory,
 				mixer_listener);
 } catch (...) {
@@ -71,11 +74,12 @@ LoadOutputControl(EventLoop &event_loop,
 		  const ReplayGainConfig &replay_gain_config,
 		  MixerListener &mixer_listener,
 		  AudioOutputClient &client, const ConfigBlock &block,
+		  const AudioOutputDefaults &defaults,
 		  FilterFactory *filter_factory)
 {
 	auto output = LoadOutput(event_loop, replay_gain_config,
 				 mixer_listener,
-				 block, filter_factory);
+				 block, defaults, filter_factory);
 	auto *control = new AudioOutputControl(std::move(output), client);
 
 	try {
@@ -95,6 +99,7 @@ MultipleOutputs::Configure(EventLoop &event_loop,
 			   const ReplayGainConfig &replay_gain_config,
 			   AudioOutputClient &client)
 {
+	const AudioOutputDefaults defaults(config);
 	FilterFactory filter_factory(config);
 
 	for (const auto &block : config.GetBlockList(ConfigBlockOption::AUDIO_OUTPUT)) {
@@ -102,7 +107,8 @@ MultipleOutputs::Configure(EventLoop &event_loop,
 		auto *output = LoadOutputControl(event_loop,
 						 replay_gain_config,
 						 mixer_listener,
-						 client, block, &filter_factory);
+						 client, block, defaults,
+						 &filter_factory);
 		if (FindByName(output->GetName()) != nullptr)
 			throw FormatRuntimeError("output devices with identical "
 						 "names: %s", output->GetName());
@@ -116,7 +122,7 @@ MultipleOutputs::Configure(EventLoop &event_loop,
 		auto *output = LoadOutputControl(event_loop,
 						 replay_gain_config,
 						 mixer_listener,
-						 client, empty,
+						 client, empty, defaults,
 						 nullptr);
 		outputs.push_back(output);
 	}
@@ -127,12 +133,14 @@ MultipleOutputs::AddNullOutput(EventLoop &event_loop,
 			       const ReplayGainConfig &replay_gain_config,
 			       AudioOutputClient &client)
 {
+	const AudioOutputDefaults defaults;
+
 	ConfigBlock block;
 	block.AddBlockParam("type", "null");
 
 	auto *output = LoadOutputControl(event_loop, replay_gain_config,
 					 mixer_listener,
-					 client, block, nullptr);
+					 client, block, defaults, nullptr);
 	outputs.push_back(output);
 }