filter/LoadChain: move code to class FilterFactory

Eliminate a use of GetGlobalConfig().

src/output/Filtered.hxx

@@ -28,6 +28,7 @@
 #include <map>
 #include <chrono>
 
+class FilterFactory;
 class PreparedFilter;
 class MusicPipe;
 class EventLoop;
@@ -127,12 +128,14 @@ public:
 	 */
 	FilteredAudioOutput(const char *_plugin_name,
 			    std::unique_ptr<AudioOutput> &&_output,
-			    const ConfigBlock &block);
+			    const ConfigBlock &block,
+			    FilterFactory *filter_factory);
 
 	~FilteredAudioOutput();
 
 private:
-	void Configure(const ConfigBlock &block);
+	void Configure(const ConfigBlock &block,
+		       FilterFactory *filter_factory);
 
 public:
 	void Setup(EventLoop &event_loop,
@@ -235,6 +238,7 @@ std::unique_ptr<FilteredAudioOutput>
 audio_output_new(EventLoop &event_loop,
 		 const ReplayGainConfig &replay_gain_config,
 		 const ConfigBlock &block,
+		 FilterFactory *filter_factory,
 		 MixerListener &mixer_listener);
 
 #endif

src/output/Init.cxx

@@ -54,10 +54,11 @@
 
 FilteredAudioOutput::FilteredAudioOutput(const char *_plugin_name,
 					 std::unique_ptr<AudioOutput> &&_output,
-					 const ConfigBlock &block)
+					 const ConfigBlock &block,
+					 FilterFactory *filter_factory)
 	:plugin_name(_plugin_name), output(std::move(_output))
 {
-	Configure(block);
+	Configure(block, filter_factory);
 }
 
 static const AudioOutputPlugin *
@@ -148,7 +149,8 @@ audio_output_load_mixer(EventLoop &event_loop, FilteredAudioOutput &ao,
 }
 
 void
-FilteredAudioOutput::Configure(const ConfigBlock &block)
+FilteredAudioOutput::Configure(const ConfigBlock &block,
+			       FilterFactory *filter_factory)
 {
 	if (!block.IsNull()) {
 		name = block.GetBlockValue(AUDIO_OUTPUT_NAME);
@@ -181,8 +183,9 @@ FilteredAudioOutput::Configure(const ConfigBlock &block)
 	}
 
 	try {
-		filter_chain_parse(*prepared_filter, GetGlobalConfig(),
-				   block.GetBlockValue(AUDIO_FILTERS, ""));
+		if (filter_factory != nullptr)
+			filter_chain_parse(*prepared_filter, *filter_factory,
+					   block.GetBlockValue(AUDIO_FILTERS, ""));
 	} catch (...) {
 		/* It's not really fatal - Part of the filter chain
 		   has been set up already and even an empty one will
@@ -256,6 +259,7 @@ std::unique_ptr<FilteredAudioOutput>
 audio_output_new(EventLoop &event_loop,
 		 const ReplayGainConfig &replay_gain_config,
 		 const ConfigBlock &block,
+		 FilterFactory *filter_factory,
 		 MixerListener &mixer_listener)
 {
 	const AudioOutputPlugin *plugin;
@@ -286,7 +290,8 @@ audio_output_new(EventLoop &event_loop,
 	assert(ao != nullptr);
 
 	auto f = std::make_unique<FilteredAudioOutput>(plugin->name,
-						       std::move(ao), block);
+						       std::move(ao), block,
+						       filter_factory);
 	f->Setup(event_loop, replay_gain_config,
 		 plugin->mixer_plugin,
 		 mixer_listener, block);

src/output/MultipleOutputs.cxx

@@ -23,6 +23,7 @@
 #include "Domain.hxx"
 #include "MusicPipe.hxx"
 #include "MusicChunk.hxx"
+#include "filter/Factory.hxx"
 #include "config/Block.hxx"
 #include "config/Data.hxx"
 #include "config/Option.hxx"
@@ -51,9 +52,11 @@ static std::unique_ptr<FilteredAudioOutput>
 LoadOutput(EventLoop &event_loop,
 	   const ReplayGainConfig &replay_gain_config,
 	   MixerListener &mixer_listener,
-	   const ConfigBlock &block)
+	   const ConfigBlock &block,
+	   FilterFactory *filter_factory)
 try {
 	return audio_output_new(event_loop, replay_gain_config, block,
+				filter_factory,
 				mixer_listener);
 } catch (...) {
 	if (block.line > 0)
@@ -67,11 +70,12 @@ static AudioOutputControl *
 LoadOutputControl(EventLoop &event_loop,
 		  const ReplayGainConfig &replay_gain_config,
 		  MixerListener &mixer_listener,
-		  AudioOutputClient &client, const ConfigBlock &block)
+		  AudioOutputClient &client, const ConfigBlock &block,
+		  FilterFactory *filter_factory)
 {
 	auto output = LoadOutput(event_loop, replay_gain_config,
 				 mixer_listener,
-				 block);
+				 block, filter_factory);
 	auto *control = new AudioOutputControl(std::move(output), client);
 
 	try {
@@ -91,12 +95,14 @@ MultipleOutputs::Configure(EventLoop &event_loop,
 			   const ReplayGainConfig &replay_gain_config,
 			   AudioOutputClient &client)
 {
+	FilterFactory filter_factory(config);
+
 	for (const auto &block : config.GetBlockList(ConfigBlockOption::AUDIO_OUTPUT)) {
 		block.SetUsed();
 		auto *output = LoadOutputControl(event_loop,
 						 replay_gain_config,
 						 mixer_listener,
-						 client, block);
+						 client, block, &filter_factory);
 		if (FindByName(output->GetName()) != nullptr)
 			throw FormatRuntimeError("output devices with identical "
 						 "names: %s", output->GetName());
@@ -110,7 +116,8 @@ MultipleOutputs::Configure(EventLoop &event_loop,
 		auto *output = LoadOutputControl(event_loop,
 						 replay_gain_config,
 						 mixer_listener,
-						 client, empty);
+						 client, empty,
+						 nullptr);
 		outputs.push_back(output);
 	}
 }
@@ -125,7 +132,7 @@ MultipleOutputs::AddNullOutput(EventLoop &event_loop,
 
 	auto *output = LoadOutputControl(event_loop, replay_gain_config,
 					 mixer_listener,
-					 client, block);
+					 client, block, nullptr);
 	outputs.push_back(output);
 }