[DB] Reworked feature extraction

src/Makefile.am

@@ -7,18 +7,21 @@ lms_SOURCES = \
 	$(srcdir)/config/Config.cpp				\
 	$(srcdir)/cover/CoverArtGrabber.cpp			\
 	$(srcdir)/database/Artist.cpp				\
-	$(srcdir)/database/DatabaseClassifier.cpp		\
+	$(srcdir)/database/DatabaseFeatureExtractor.cpp		\
 	$(srcdir)/database/DatabaseHandler.cpp			\
 	$(srcdir)/database/DatabaseUpdater.cpp			\
 	$(srcdir)/database/MediaDirectory.cpp			\
 	$(srcdir)/database/Playlist.cpp				\
 	$(srcdir)/database/Release.cpp				\
 	$(srcdir)/database/SearchFilter.cpp			\
+	$(srcdir)/database/Setting.cpp				\
 	$(srcdir)/database/SqlQuery.cpp				\
 	$(srcdir)/database/Track.cpp				\
 	$(srcdir)/database/User.cpp				\
 	$(srcdir)/database/Video.cpp				\
+	$(srcdir)/database/cluster/DatabaseHighLevelCluster.cpp	\
 	$(srcdir)/feature/FeatureExtractor.cpp			\
+	$(srcdir)/feature/FeatureStore.cpp			\
 	$(srcdir)/image/Image.cpp				\
 	$(srcdir)/logger/Logger.cpp				\
 	$(srcdir)/metadata/AvFormat.cpp				\

src/config/Config.hpp

@@ -22,6 +22,7 @@
 #include <boost/filesystem.hpp>
 #include <libconfig.h++>
 
+// Used to get config values from configuration files
 class Config
 {
 	public:

src/database/DatabaseFeatureExtractor.cpp

@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2016 Emeric Poupon
+ *
+ * This file is part of LMS.
+ *
+ * LMS 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * LMS 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 LMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config/Config.hpp"
+#include "logger/Logger.hpp"
+
+#include "feature/FeatureExtractor.hpp"
+#include "feature/FeatureStore.hpp"
+
+#include "DatabaseFeatureExtractor.hpp"
+
+namespace Database {
+
+static std::string getMBID(Track::id_type trackId)
+{
+	Wt::Dbo::Transaction transaction(UpdaterDboSession());
+	Track::pointer track = Track::getById(UpdaterDboSession(), trackId);
+	return track->getMBID();
+}
+
+void
+FeatureExtractor::processDatabaseUpdate(Updater::Stats stats)
+{
+	bool fetchHighLevel = Config::instance().getBool("tag-highlevel-acousticbrainz", false);
+	bool fetchLowLevel = Config::instance().getBool("tag-similarity-acousticbrainz", false);
+
+	if (!fetchHighLevel && !fetchLowLevel)
+	{
+		LMS_LOG(DBUPDATER, INFO) << "No need to extract features";
+		return;
+	}
+
+	LMS_LOG(DBUPDATER, INFO) << "Processing tracks in order to extract features...";
+	std::vector<Track::id_type> trackIds = Track::getAllIds(UpdaterDboSession());
+	for (auto trackId : trackIds)
+	{
+		if (UpdaterQuitRequested())
+			return;
+
+		std::string mbid = getMBID(trackId);
+		if (mbid.empty())
+		{
+			LMS_LOG(DBUPDATER, DEBUG) << "No MBID for track " << trackId << ", skipping";
+			continue;
+		}
+
+		if (fetchLowLevel && !Feature::Store::instance().exists(UpdaterDboSession(), trackId, "low_level"))
+		{
+			boost::property_tree::ptree feature;
+			if (::Feature::Extractor::getLowLevel(feature, mbid))
+				Feature::Store::instance().set(UpdaterDboSession(), trackId, "low_level", feature);
+		}
+
+		if (fetchHighLevel && !Feature::Store::instance().exists(UpdaterDboSession(), trackId, "high_level"))
+		{
+			boost::property_tree::ptree feature;
+			if (::Feature::Extractor::getHighLevel(feature, mbid))
+				Feature::Store::instance().set(UpdaterDboSession(), trackId, "high_level", feature);
+		}
+	}
+
+	LMS_LOG(DBUPDATER, INFO) << "Features have been extracted";
+}
+
+} // namespace Database
+

src/database/DatabaseFeatureExtractor.hpp

@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2016 Emeric Poupon
+ *
+ * This file is part of LMS.
+ *
+ * LMS 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * LMS 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 LMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "database/DatabaseUpdater.hpp"
+
+namespace Database {
+
+class FeatureExtractor
+{
+	public:
+		void processDatabaseUpdate(Updater::Stats stats);
+
+};
+
+} // namespace Database

src/database/DatabaseHandler.cpp

@@ -83,13 +83,12 @@ Handler::Handler(Wt::Dbo::SqlConnectionPool& connectionPool)
 	_session.mapClass<Database::Artist>("artist");
 	_session.mapClass<Database::Cluster>("cluster");
 	_session.mapClass<Database::Track>("track");
-	_session.mapClass<Database::Feature>("feature");
 	_session.mapClass<Database::Playlist>("playlist");
 	_session.mapClass<Database::PlaylistEntry>("playlist_entry");
 	_session.mapClass<Database::Release>("release");
 	_session.mapClass<Database::Video>("video");
 	_session.mapClass<Database::MediaDirectory>("media_directory");
-	_session.mapClass<Database::MediaDirectorySettings>("media_directory_settings");
+	_session.mapClass<Database::Setting>("setting");
 
 	_session.mapClass<Database::User>("user");
 	_session.mapClass<Database::AuthInfo>("auth_info");
@@ -101,13 +100,10 @@ Handler::Handler(Wt::Dbo::SqlConnectionPool& connectionPool)
 
 	        _session.createTables();
 		_session.execute("CREATE INDEX artist_name_idx ON artist(name)");
-		_session.execute("CREATE INDEX cluster_name_idx ON cluster(name)");
-		_session.execute("CREATE INDEX cluster_type_idx ON cluster(type)");
-		_session.execute("CREATE INDEX cluster_name_type_idx ON cluster(name, type)");
 		_session.execute("CREATE INDEX release_name_idx ON release(name)");
-		_session.execute("CREATE INDEX track_name_idx ON track(name)");
-		_session.execute("CREATE INDEX feature_type_idx ON feature(type)");
-		_session.execute("CREATE INDEX feature_track_type_idx ON feature(track_id,type)");
+		_session.execute("CREATE INDEX track_artist_idx ON track(artist_id)");
+		_session.execute("CREATE INDEX track_release_idx ON track(release_id)");
+		_session.execute("CREATE INDEX cluster_type_idx ON cluster(type)");
 	}
 	catch(std::exception& e) {
 		LMS_LOG(DB, ERROR) << "Cannot create tables: " << e.what();

src/database/DatabaseUpdater.cpp

@@ -162,7 +162,6 @@ Updater::stop(void)
 {
 	_running = false;
 
-	// TODO cancel all jobs (timer, ...)
 	_scheduleTimer.cancel();
 
 	_ioService.stop();
@@ -235,64 +234,67 @@ Updater::scheduleScan( boost::posix_time::ptime time)
 void
 Updater::process(boost::system::error_code err)
 {
-	if (!err)
+	if (err)
+		return;
+
+	updateFileExtensions();
+
+	Stats stats;
+
+	checkAudioFiles(stats);
+	checkVideoFiles(stats);
+
+	std::vector<RootDirectory> rootDirectories;
 	{
-		updateFileExtensions();
+		Wt::Dbo::Transaction transaction(_db->getSession());
 
-		Stats stats;
-
-		checkAudioFiles(stats);
-		checkVideoFiles(stats);
-
-		std::vector<RootDirectory> rootDirectories;
-		{
-			Wt::Dbo::Transaction transaction(_db->getSession());
-
-			for (MediaDirectory::pointer directory : MediaDirectory::getAll(_db->getSession()))
-				rootDirectories.push_back( RootDirectory( directory->getType(), directory->getPath() ));
-		}
-
-		for (RootDirectory rootDirectory : rootDirectories)
-		{
-			if (!_running)
-				break;
-
-			LMS_LOG(DBUPDATER, INFO) << "Processing root directory '" << rootDirectory.path << "'...";
-			processRootDirectory(rootDirectory, stats);
-			LMS_LOG(DBUPDATER, INFO) << "Processing root directory '" << rootDirectory.path << "' DONE";
-		}
-
-		if (_running)
-			checkDuplicatedAudioFiles(stats);
-
-		LMS_LOG(DBUPDATER, INFO) << "Scan complete. Scanned = " << stats.nbScanned << ", Skipped = " << stats.nbSkipped << ", Changes = " << stats.nbChanges() << " (added = " << stats.nbAdded << ", nbRemoved = " << stats.nbRemoved << ", nbModified = " << stats.nbModified << "), Scan errors = " << stats.nbScanErrors << ", Not imported = " << stats.nbNotImported;
-
-		// Update database stats
-		boost::posix_time::ptime now = boost::posix_time::second_clock::local_time();
-		{
-			Wt::Dbo::Transaction transaction(_db->getSession());
-
-			Database::MediaDirectorySettings::pointer settings = Database::MediaDirectorySettings::get(_db->getSession());
-
-			if (stats.nbChanges() > 0)
-				settings.modify()->setLastUpdate(now);
-
-			// Save the last scan only if it has been completed
-			if (_running)
-				settings.modify()->setLastScan(now);
-
-			// If the manual scan was required we can now set it to done
-			// Update only if the scan is complete!
-			if (settings->getManualScanRequested() && _running)
-				settings.modify()->setManualScanRequested(false);
-
-		}
-
-		scanComplete().emit(stats);
-
-		if (_running)
-			processNextJob();
+		for (MediaDirectory::pointer directory : MediaDirectory::getAll(_db->getSession()))
+			rootDirectories.push_back( RootDirectory( directory->getType(), directory->getPath() ));
 	}
+
+	for (RootDirectory rootDirectory : rootDirectories)
+	{
+		if (!_running)
+			break;
+
+		LMS_LOG(DBUPDATER, INFO) << "Processing root directory '" << rootDirectory.path << "'...";
+		processRootDirectory(rootDirectory, stats);
+		LMS_LOG(DBUPDATER, INFO) << "Processing root directory '" << rootDirectory.path << "' DONE";
+	}
+
+	if (_running)
+	{
+		checkDuplicatedAudioFiles(stats);
+
+		LMS_LOG(DBUPDATER, INFO) << "Processed all files, now calling listeners...";
+		scanComplete().emit(stats);
+	}
+
+	LMS_LOG(DBUPDATER, INFO) << "Scan complete. Scanned = " << stats.nbScanned << ", Skipped = " << stats.nbSkipped << ", Changes = " << stats.nbChanges() << " (added = " << stats.nbAdded << ", nbRemoved = " << stats.nbRemoved << ", nbModified = " << stats.nbModified << "), Scan errors = " << stats.nbScanErrors << ", Not imported = " << stats.nbNotImported;
+
+	// Update database stats
+	boost::posix_time::ptime now = boost::posix_time::second_clock::local_time();
+	{
+		Wt::Dbo::Transaction transaction(_db->getSession());
+
+		Database::MediaDirectorySettings::pointer settings = Database::MediaDirectorySettings::get(_db->getSession());
+
+		if (stats.nbChanges() > 0)
+			settings.modify()->setLastUpdate(now);
+
+		// Save the last scan only if it has been completed
+		if (_running)
+			settings.modify()->setLastScan(now);
+
+		// If the manual scan was required we can now set it to done
+		// Update only if the scan is complete!
+		if (settings->getManualScanRequested() && _running)
+			settings.modify()->setManualScanRequested(false);
+
+	}
+
+	if (_running)
+		processNextJob();
 }
 
 void
@@ -538,12 +540,9 @@ Updater::processAudioFile( const boost::filesystem::path& file, Stats& stats)
 	{
 		LMS_LOG(DBUPDATER, INFO) << "Updating '" << file << "'";
 
-		// TODO Remove the songs from its clusters
-		// TODO Remove the features of this song
-		track.remove();
-		track.flush();
-
-		track = Track::create(_db->getSession(), file);
+		// Remove the songs from its clusters
+		for (auto cluster : track->getClusters())
+			cluster.remove();
 
 		stats.nbModified++;
 	}
@@ -614,8 +613,7 @@ Updater::processAudioFile( const boost::filesystem::path& file, Stats& stats)
 	_sigTrackChanged.emit(true, track.id(), track->getMBID(), track->getPath());
 }
 
-
-	void
+void
 Updater::processRootDirectory(RootDirectory rootDirectory, Stats& stats)
 {
 	boost::system::error_code ec;

src/database/DatabaseUpdater.hpp

@@ -73,6 +73,9 @@ class Updater
 
 		std::mutex&	getMutex(void) { return _mutex; }
 
+		Database::Handler& getDb(void) { return *_db; }
+
+		bool quitRequested(void) const { return !_running;}
 	private:
 
 		Updater();
@@ -133,8 +136,18 @@ class Updater
 
 		MetaData::TagLibParser 	_metadataParser;
 
-
 }; // class Updater
 
+// Helper to get the updater session data
+static inline Wt::Dbo::Session& UpdaterDboSession()
+{
+	return Updater::instance().getDb().getSession();
+}
+
+static inline bool UpdaterQuitRequested()
+{
+	return Updater::instance().quitRequested();
+}
+
 } // Database
 

src/database/MediaDirectory.cpp

@@ -17,8 +17,6 @@
  * along with LMS.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <boost/foreach.hpp>
-
 #include "Types.hpp"
 
 static std::string pathsToString(const std::vector<boost::filesystem::path>& paths)
@@ -111,8 +109,7 @@ MediaDirectory::create(Wt::Dbo::Session& session, boost::filesystem::path p, Typ
 void
 MediaDirectory::eraseAll(Wt::Dbo::Session& session)
 {
-	std::vector<MediaDirectory::pointer> dirs = getAll(session);
-	BOOST_FOREACH(MediaDirectory::pointer dir, dirs)
+	for (auto dir : getAll(session))
 		dir.remove();
 }
 

src/feature/FeatureExtractor.cpp

@@ -42,7 +42,7 @@ Extractor::init(void)
 
 	if (extractorPath.empty())
 	{
-		LMS_LOG(CLASSIFICATION, ERROR) << "Failed to find path to " << execName;
+		LMS_LOG(FEATURE, ERROR) << "Failed to find path to " << execName;
 		return false;
 	}
 
@@ -71,17 +71,17 @@ static bool fetchJSONData(boost::property_tree::ptree& pt, std::string url)
 	}
 	catch( curlpp::RuntimeError &e )
 	{
-		LMS_LOG(CLASSIFICATION, ERROR) << "curlpp error: " << e.what();
+		LMS_LOG(FEATURE, ERROR) << "curlpp error: " << e.what();
 		return false;
 	}
 	catch( curlpp::LogicError &e )
 	{
-		LMS_LOG(CLASSIFICATION, ERROR) << "curlpp error: " << e.what();
+		LMS_LOG(FEATURE, ERROR) << "curlpp error: " << e.what();
 		return false;
 	}
 	catch ( boost::property_tree::ptree_error& e)
 	{
-		LMS_LOG(CLASSIFICATION, ERROR) << "JSON paring failed: " << e.what();
+		LMS_LOG(FEATURE, ERROR) << "JSON paring failed: " << e.what();
 		return false;
 	}
 
@@ -92,7 +92,7 @@ static bool fetchJSONData(boost::property_tree::ptree& pt, std::string url)
 bool
 Extractor::getLowLevel(boost::property_tree::ptree& pt, std::string mbid)
 {
-	LMS_LOG(CLASSIFICATION, DEBUG) << "Trying to fetch low level metadata for track '" << mbid << "' on AcousticBrainz";
+	LMS_LOG(FEATURE, DEBUG) << "Trying to fetch low level metadata for track '" << mbid << "' on AcousticBrainz";
 
 	boost::property_tree::ptree res;
 	if (!fetchJSONData(res, "https://acousticbrainz.org/" + mbid + "/low-level"))
@@ -101,14 +101,14 @@ Extractor::getLowLevel(boost::property_tree::ptree& pt, std::string mbid)
 	auto message = res.get_child_optional("message");
 	if (message)
 	{
-		LMS_LOG(CLASSIFICATION, ERROR) << "Cannot get data on AcousticBrainz: " << message->data();
+		LMS_LOG(FEATURE, ERROR) << "Track '" << mbid << "': cannot get data on AcousticBrainz: " << message->data();
 		return false;
 	}
 
 	auto lowlevel = res.get_child_optional("lowlevel");
 	if (!lowlevel)
 	{
-		LMS_LOG(CLASSIFICATION, ERROR) << "Low level data not found!";
+		LMS_LOG(FEATURE, ERROR) << "Track '" << mbid << "': low level data not found!";
 		return false;
 	}
 
@@ -122,7 +122,11 @@ Extractor::getLowLevel(boost::property_tree::ptree& pt, std::string mbid)
 bool
 Extractor::getHighLevel(boost::property_tree::ptree& pt, std::string mbid)
 {
-	LMS_LOG(CLASSIFICATION, DEBUG) << "Trying to fetch high level metadata for track '" << mbid << "' on AcousticBrainz";
+	LMS_LOG(FEATURE, DEBUG) << "Trying to fetch high level metadata for track '" << mbid << "' on AcousticBrainz";
+
+	// TODO check MBID
+	if (mbid.empty())
+		return false;
 
 	boost::property_tree::ptree res;
 	if (!fetchJSONData(res, "https://acousticbrainz.org/" + mbid + "/high-level"))
@@ -131,17 +135,19 @@ Extractor::getHighLevel(boost::property_tree::ptree& pt, std::string mbid)
 	auto message = res.get_child_optional("message");
 	if (message)
 	{
-		LMS_LOG(CLASSIFICATION, ERROR) << "Cannot get data on AcousticBrainz: " << message->data();
+		LMS_LOG(FEATURE, ERROR) << "Track '" << mbid << "': cannot get data on AcousticBrainz: " << message->data();
 		return false;
 	}
 
 	auto lowlevel = res.get_child_optional("highlevel");
 	if (!lowlevel)
 	{
-		LMS_LOG(CLASSIFICATION, ERROR) << "High level data not found!";
+		LMS_LOG(FEATURE, ERROR) << "Track '" << mbid << "': high level data not found!";
 		return false;
 	}
 
+	res.erase("metadata");
+
 	pt = res;
 
 	return true;
@@ -151,7 +157,7 @@ Extractor::getHighLevel(boost::property_tree::ptree& pt, std::string mbid)
 bool
 Extractor::getLowLevel(boost::property_tree::ptree& pt, boost::filesystem::path path)
 {
-	LMS_LOG(CLASSIFICATION, DEBUG) << "Extracting low level data from '" << path << "'";
+	LMS_LOG(FEATURE, DEBUG) << "Extracting low level data from '" << path << "'";
 
 	if (extractorPath.empty())
 		return false;
@@ -168,7 +174,7 @@ Extractor::getLowLevel(boost::property_tree::ptree& pt, boost::filesystem::path
 		in.open(extractorPath.string(), args);
 		if (!in.is_open())
 		{
-			LMS_LOG(CLASSIFICATION, ERROR) << "Exec failed!";
+			LMS_LOG(FEATURE, ERROR) << "Exec failed!";
 			return false;
 		}
 
@@ -198,7 +204,7 @@ Extractor::getLowLevel(boost::property_tree::ptree& pt, boost::filesystem::path
 	}
 	catch ( boost::property_tree::ptree_error& e)
 	{
-		LMS_LOG(CLASSIFICATION, ERROR) << "JSON paring failed: " << e.what();
+		LMS_LOG(FEATURE, ERROR) << "JSON parsing failed: " << e.what();
 		return false;
 	}
 

src/feature/FeatureExtractor.hpp

@@ -25,6 +25,8 @@
 
 namespace Feature {
 
+typedef boost::property_tree::ptree Type;
+
 class Extractor
 {
 	public:

src/feature/FeatureStore.cpp

@@ -0,0 +1,145 @@
+/*
+ * Copyright (C) 2016 Emeric Poupon
+ *
+ * This file is part of LMS.
+ *
+ * LMS 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * LMS 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 LMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <boost/property_tree/json_parser.hpp>
+
+#include "logger/Logger.hpp"
+#include "config/Config.hpp"
+
+#include "FeatureStore.hpp"
+
+namespace Feature {
+
+Store::Store()
+{
+}
+
+Store&
+Store::instance(void)
+{
+	static Store instance;
+	return instance;
+}
+
+void
+Store::reload(void)
+{
+	_storePath = Config::instance().getString("features-dir-path", "");
+
+	if (!boost::filesystem::is_directory(_storePath))
+	{
+		LMS_LOG(DBUPDATER, ERROR) << "Feature directory '" << _storePath << "' not valid!";
+		throw std::runtime_error("Invalid feature directory '" + _storePath.string());
+	}
+}
+
+boost::filesystem::path getPath(boost::filesystem::path root, std::string mbid, std::string type)
+{
+	return root / (mbid + "_" + type);
+}
+
+bool
+Store::exists(Wt::Dbo::Session& session, Database::Track::id_type trackId, std::string type)
+{
+	if (_storePath.empty())
+		reload();
+
+	Wt::Dbo::Transaction transaction(session);
+
+	auto track = Database::Track::getById(session, trackId);
+	std::string mbid = track->getMBID();
+
+	transaction.commit();
+
+	if (mbid.empty())
+		return false;
+
+	boost::filesystem::path path = getPath(_storePath, mbid, type);
+	return boost::filesystem::exists(path);
+}
+
+bool
+Store::get(Wt::Dbo::Session& session, Database::Track::id_type trackId, std::string type, Type& feature)
+{
+	if (_storePath.empty())
+		reload();
+
+	Wt::Dbo::Transaction transaction(session);
+
+	auto track = Database::Track::getById(session, trackId);
+	std::string mbid = track->getMBID();
+
+	transaction.commit();
+
+	if (mbid.empty())
+		return false;
+
+	boost::filesystem::path path = getPath(_storePath, mbid, type);
+	if (!boost::filesystem::exists(path))
+		return false;
+
+	try
+	{
+		std::ifstream iss(path.string().c_str(), std::ios::in);
+		boost::property_tree::json_parser::read_json(iss, feature);
+	}
+	catch (boost::property_tree::ptree_error& e)
+	{
+		LMS_LOG(FEATURE, ERROR) << "JSON parsing failed: " << e.what();
+		return false;
+	}
+
+	return true;
+}
+
+
+bool
+Store::set(Wt::Dbo::Session& session, Database::Track::id_type trackId, std::string type, const Type& feature)
+{
+	if (_storePath.empty())
+		reload();
+
+	Wt::Dbo::Transaction transaction(session);
+
+	auto track = Database::Track::getById(session, trackId);
+	std::string mbid = track->getMBID();
+
+	transaction.commit();
+
+	if (mbid.empty())
+		return false;
+
+	boost::filesystem::path path = getPath(_storePath, mbid, type);
+
+	try
+	{
+		std::ofstream oss(path.string().c_str(), std::ios::out);
+		boost::property_tree::json_parser::write_json(oss, feature);
+	}
+	catch (boost::property_tree::ptree_error& e)
+	{
+		LMS_LOG(FEATURE, ERROR) << "JSON writing failed: " << e.what();
+		return false;
+	}
+
+	return true;
+}
+
+} // namespace CoverArt
+

src/feature/FeatureStore.hpp

@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2016 Emeric Poupon
+ *
+ * This file is part of LMS.
+ *
+ * LMS 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * LMS 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 LMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <boost/filesystem/path.hpp>
+
+#include "database/Types.hpp"
+#include "FeatureExtractor.hpp"
+
+namespace Feature {
+
+class Store
+{
+	public:
+		Store(const Store&) = delete;
+		Store& operator=(const Store&) = delete;
+
+		static Store& instance();
+
+		bool	exists(Wt::Dbo::Session& session, Database::Track::id_type trackId, std::string type);
+		bool	get(Wt::Dbo::Session& session, Database::Track::id_type trackId, std::string type, Type& feature);
+
+		bool	set(Wt::Dbo::Session& session, Database::Track::id_type trackId, std::string type, const Type& feature);
+
+		void reload();
+	private:
+		Store();
+
+		boost::filesystem::path	_storePath;
+};
+
+} // namespace CoverArt
+

src/logger/Logger.cpp

@@ -26,13 +26,13 @@ std::string getModuleName(Module mod)
 		case Module::AV:		return "AV";
 		case Module::COVER:		return "COVER";
 		case Module::DB:		return "DB";
-		case Module::CLASSIFICATION:	return "CLASSIFICATION";
-		case Module::DBUPDATER:	return "DB UPDATER";
+		case Module::DBUPDATER:		return "DB UPDATER";
+		case Module::FEATURE:		return "FEATURE";
 		case Module::MAIN:		return "MAIN";
-		case Module::METADATA:	return "METADATA";
-		case Module::REMOTE:	return "REMOTE";
-		case Module::SERVICE:	return "SERVICE";
-		case Module::TRANSCODE:	return "TRANSCODE";
+		case Module::METADATA:		return "METADATA";
+		case Module::REMOTE:		return "REMOTE";
+		case Module::SERVICE:		return "SERVICE";
+		case Module::TRANSCODE:		return "TRANSCODE";
 		case Module::UI:		return "UI";
 	}
 	return "";

src/logger/Logger.hpp

@@ -38,10 +38,10 @@ enum class Severity
 enum class Module
 {
 	AV,
-	CLASSIFICATION,
 	COVER,
 	DB,
 	DBUPDATER,
+	FEATURE,
 	MAIN,
 	METADATA,
 	REMOTE,

src/ui/audio/desktop/TableFilter.cpp

@@ -33,7 +33,7 @@ using namespace Database;
 TableFilterCluster::TableFilterCluster(Wt::WContainerWidget* parent)
 : Wt::WTableView( parent ), Filter()
 {
-	const std::vector<Wt::WString> columnNames = {"Type", "Name", "Tracks"};
+	const std::vector<Wt::WString> columnNames = {"Tag", "Tracks"};
 
 	SearchFilter filter;
 
@@ -44,8 +44,7 @@ TableFilterCluster::TableFilterCluster(Wt::WContainerWidget* parent)
 	this->setAlternatingRowColors(true);
 	this->setModel(&_queryModel);
 
-	this->setColumnWidth(1, 120);
-	this->setColumnWidth(2, 80);
+	this->setColumnWidth(1, 80);
 
 	this->selectionChanged().connect(this, &TableFilterCluster::emitUpdate);
 
@@ -77,9 +76,9 @@ TableFilterCluster::TableFilterCluster(Wt::WContainerWidget* parent)
 void
 TableFilterCluster::layoutSizeChanged (int width, int height)
 {
-	std::size_t otherColumnSizes = this->columnWidth(1).toPixels() + this->columnWidth(2).toPixels();
+	std::size_t trackColumnSize = this->columnWidth(1).toPixels();
 	// Set the remaining size for the name column
-	this->setColumnWidth(0, width - otherColumnSizes - (7 * 3) - 2);
+	this->setColumnWidth(0, width - trackColumnSize - (7 * 2) - 2);
 }
 
 // Set constraints on this filter