Introducing new table medium, ref #699

src/libs/database/CMakeLists.txt

@@ -8,6 +8,7 @@ add_library(lmsdatabase STATIC
 	impl/objects/Image.cpp
 	impl/objects/Listen.cpp
 	impl/objects/MediaLibrary.cpp
+	impl/objects/Medium.cpp
 	impl/objects/PlayListFile.cpp
 	impl/objects/PlayQueue.cpp
 	impl/objects/TrackArtistLink.cpp

src/libs/database/impl/Migration.cpp

@@ -34,7 +34,7 @@ namespace lms::db
 {
     namespace
     {
-        static constexpr Version LMS_DATABASE_VERSION{ 98 };
+        static constexpr Version LMS_DATABASE_VERSION{ 99 };
     }
 
     VersionInfo::VersionInfo()
@@ -1423,6 +1423,111 @@ WHERE art.image_id IS NULL)");
         dropIndexes(session);
     }
 
+    void migrateFromV98(Session& session)
+    {
+        // Medium support
+        dropIndexes(session);
+
+        // New table for mediums
+        utils::executeCommand(*session.getDboSession(), R"(CREATE TABLE IF NOT EXISTS "medium" (
+  "id" integer primary key autoincrement,
+  "version" integer not null,
+  "name" text not null,
+  "position" integer,
+  "track_count" integer,
+  "media" text not null,
+  "replay_gain" real,
+  "release_id" bigint,
+  "preferred_artwork_id" bigint,
+  constraint "fk_medium_release" foreign key ("release_id") references "release" ("id") on delete cascade deferrable initially deferred,
+  constraint "fk_medium_preferred_artwork" foreign key ("preferred_artwork_id") references "artwork" ("id") on delete set null deferrable initially deferred
+  ))");
+
+        // New primary key in track -> need to recreate the table
+        utils::executeCommand(*session.getDboSession(), R"(CREATE TABLE IF NOT EXISTS "track_backup" (
+  "id" integer primary key autoincrement,
+  "version" integer not null,
+  "scan_version" integer not null,
+  "track_number" integer,
+  "name" text not null,
+  "duration" integer,
+  "bitrate" integer not null,
+  "bits_per_sample" integer not null,
+  "channel_count" integer not null,
+  "sample_rate" integer not null,
+  "date" text,
+  "original_date" text,
+  "absolute_file_path" text not null,
+  "file_size" bigint not null,
+  "file_last_write" text,
+  "file_added" text,
+  "mbid" text not null,
+  "recording_mbid" text not null,
+  "copyright" text not null,
+  "copyright_url" text not null,
+  "advisory" integer not null,
+  "replay_gain" real,
+  "artist_display_name" text not null,
+  "comment" text not null,
+  "medium_id" bigint,
+  "release_id" bigint,
+  "media_library_id" bigint,
+  "directory_id" bigint,
+  "preferred_artwork_id" bigint,
+  "preferred_media_artwork_id" bigint,
+  constraint "fk_track_medium" foreign key ("medium_id") references "medium" ("id") on delete cascade deferrable initially deferred,
+  constraint "fk_track_release" foreign key ("release_id") references "release" ("id") on delete cascade deferrable initially deferred,
+  constraint "fk_track_media_library" foreign key ("media_library_id") references "media_library" ("id") on delete set null deferrable initially deferred,
+  constraint "fk_track_directory" foreign key ("directory_id") references "directory" ("id") on delete cascade deferrable initially deferred,
+  constraint "fk_track_preferred_artwork" foreign key ("preferred_artwork_id") references "artwork" ("id") on delete set null deferrable initially deferred,
+  constraint "fk_track_preferred_media_artwork" foreign key ("preferred_media_artwork_id") references "artwork" ("id") on delete set null deferrable initially deferred
+    ))");
+
+        // Migrate data:
+        // - removed disc_number, total_track, disc_subtitle, release_replay_gain
+        // - renamed track_replay_gain to replay_gain
+        // - with the new medium_id field set to null
+        utils::executeCommand(*session.getDboSession(), R"(INSERT INTO track_backup
+SELECT
+ id,
+ version,
+ scan_version,
+ track_number,
+ name,
+ duration,
+ bitrate,
+ bits_per_sample,
+ channel_count,
+ sample_rate,
+ date,
+ original_date,
+ absolute_file_path,
+ file_size,
+ file_last_write,
+ file_added,
+ mbid,
+ recording_mbid,
+ copyright,
+ copyright_url,
+ advisory,
+ track_replay_gain AS replay_gain,
+ artist_display_name,
+ comment,
+ NULL as medium_id,
+ release_id,
+ media_library_id,
+ directory_id,
+ preferred_artwork_id,
+ preferred_media_artwork_id
+FROM track)");
+
+        utils::executeCommand(*session.getDboSession(), "DROP TABLE track");
+        utils::executeCommand(*session.getDboSession(), "ALTER TABLE track_backup RENAME TO track");
+
+        // Just increment the scan version of the settings to make the next scan rescan all audio files
+        utils::executeCommand(*session.getDboSession(), "UPDATE scan_settings SET artist_info_scan_version = artist_info_scan_version + 1");
+    }
+
     bool doDbMigration(Session& session)
     {
         constexpr std::string_view outdatedMsg{ "Outdated database, please rebuild it (delete the .db file and restart)" };
@@ -1497,6 +1602,7 @@ WHERE art.image_id IS NULL)");
             { 95, migrateFromV95 },
             { 96, migrateFromV96 },
             { 97, migrateFromV97 },
+            { 98, migrateFromV98 },
         };
 
         bool migrationPerformed{};

src/libs/database/impl/Session.cpp

@@ -33,6 +33,7 @@
 #include "database/objects/Image.hpp"
 #include "database/objects/Listen.hpp"
 #include "database/objects/MediaLibrary.hpp"
+#include "database/objects/Medium.hpp"
 #include "database/objects/PlayListFile.hpp"
 #include "database/objects/PlayQueue.hpp"
 #include "database/objects/RatedArtist.hpp"
@@ -82,6 +83,7 @@ namespace lms::db
         _session.mapClass<Label>("label");
         _session.mapClass<Listen>("listen");
         _session.mapClass<MediaLibrary>("media_library");
+        _session.mapClass<Medium>("medium");
         _session.mapClass<PlayListFile>("playlist_file");
         _session.mapClass<PlayQueue>("playqueue");
         _session.mapClass<RatedArtist>("rated_artist");
@@ -235,6 +237,8 @@ namespace lms::db
 
             utils::executeCommand(_session, "CREATE INDEX IF NOT EXISTS media_library_id_idx ON media_library(id)");
 
+            utils::executeCommand(_session, "CREATE INDEX IF NOT EXISTS medium_release_position_idx ON medium(release_id, position)");
+
             utils::executeCommand(_session, "CREATE INDEX IF NOT EXISTS playlist_file_id_idx ON playlist_file(id)");
             utils::executeCommand(_session, "CREATE INDEX IF NOT EXISTS playlist_file_directory_idx ON playlist_file(directory_id);");
             utils::executeCommand(_session, "CREATE INDEX IF NOT EXISTS playlist_file_absolute_file_path_idx ON playlist_file(absolute_file_path)");
@@ -262,12 +266,12 @@ namespace lms::db
             utils::executeCommand(_session, "CREATE INDEX IF NOT EXISTS track_file_last_write_idx ON track(file_last_write)");
             utils::executeCommand(_session, "CREATE INDEX IF NOT EXISTS track_media_library_idx ON track(media_library_id)");
             utils::executeCommand(_session, "CREATE INDEX IF NOT EXISTS track_media_library_release_idx ON track(media_library_id, release_id)");
+            utils::executeCommand(_session, "CREATE INDEX IF NOT EXISTS track_medium_idx ON track(medium_id)");
             utils::executeCommand(_session, "CREATE INDEX IF NOT EXISTS track_mbid_idx ON track(mbid)");
             utils::executeCommand(_session, "CREATE INDEX IF NOT EXISTS track_name_file_size_idx ON track(name, file_size)");
             utils::executeCommand(_session, "CREATE INDEX IF NOT EXISTS track_name_nocase_idx ON track(name COLLATE NOCASE)");
             utils::executeCommand(_session, "CREATE INDEX IF NOT EXISTS track_original_date_idx ON track(original_date)");
             utils::executeCommand(_session, "CREATE INDEX IF NOT EXISTS track_recording_mbid_idx ON track(recording_mbid)");
-            utils::executeCommand(_session, "CREATE INDEX IF NOT EXISTS track_release_disc_idx ON track(release_id, disc_number)");
             utils::executeCommand(_session, "CREATE INDEX IF NOT EXISTS track_release_date_idx ON track(release_id, date)");
             utils::executeCommand(_session, "CREATE INDEX IF NOT EXISTS track_release_file_last_write_idx ON track(release_id, file_last_write)");
             utils::executeCommand(_session, "CREATE INDEX IF NOT EXISTS track_release_file_added_idx ON track(release_id, file_added)");

src/libs/database/impl/objects/Cluster.cpp

@@ -26,6 +26,7 @@
 #include "database/objects/Artwork.hpp"
 #include "database/objects/Directory.hpp"
 #include "database/objects/MediaLibrary.hpp"
+#include "database/objects/Medium.hpp"
 #include "database/objects/Release.hpp"
 #include "database/objects/Track.hpp"
 #include "database/objects/TrackArtistLink.hpp"

src/libs/database/impl/objects/Medium.cpp

@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2025 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 "database/objects/Medium.hpp"
+
+#include <Wt/Dbo/Impl.h>
+
+#include "database/Session.hpp"
+#include "database/objects/Artist.hpp"
+#include "database/objects/Artwork.hpp"
+#include "database/objects/Cluster.hpp"
+#include "database/objects/Directory.hpp"
+#include "database/objects/MediaLibrary.hpp"
+#include "database/objects/Release.hpp"
+#include "database/objects/Track.hpp"
+#include "database/objects/TrackArtistLink.hpp"
+#include "database/objects/TrackEmbeddedImage.hpp"
+#include "database/objects/TrackEmbeddedImageLink.hpp"
+#include "database/objects/TrackLyrics.hpp"
+
+#include "Utils.hpp"
+#include "traits/IdTypeTraits.hpp"
+
+DBO_INSTANTIATE_TEMPLATES(lms::db::Medium);
+
+namespace lms::db
+{
+    Medium::Medium(ObjectPtr<Release> release)
+        : _release(getDboPtr(release))
+    {
+    }
+
+    Medium::pointer Medium::create(Session& session, ObjectPtr<Release> release)
+    {
+        return session.getDboSession()->add(std::unique_ptr<Medium>{ new Medium{ release } });
+    }
+
+    std::size_t Medium::getCount(Session& session)
+    {
+        session.checkReadTransaction();
+
+        return utils::fetchQuerySingleResult(session.getDboSession()->query<int>("SELECT COUNT(*) FROM medium"));
+    }
+
+    Medium::pointer Medium::find(Session& session, MediumId id)
+    {
+        session.checkReadTransaction();
+
+        return utils::fetchQuerySingleResult(session.getDboSession()->query<Wt::Dbo::ptr<Medium>>("SELECT m from medium m").where("m.id = ?").bind(id));
+    }
+
+    Medium::pointer Medium::find(Session& session, ReleaseId releaseId, std::optional<std::size_t> position)
+    {
+        session.checkReadTransaction();
+
+        std::optional<int> dbPosition;
+        if (position)
+            dbPosition = static_cast<int>(*position);
+
+        auto query{ session.getDboSession()->query<Wt::Dbo::ptr<Medium>>("SELECT m from medium m") };
+        query.where("m.release_id = ?").bind(releaseId);
+        if (position)
+            query.where("m.position = ?").bind(*dbPosition);
+        else
+            query.where("m.position IS NULL");
+
+        return utils::fetchQuerySingleResult(query);
+    }
+
+} // namespace lms::db

src/libs/database/impl/objects/PlayQueue.cpp

@@ -28,6 +28,7 @@
 #include "database/objects/Cluster.hpp"
 #include "database/objects/Directory.hpp"
 #include "database/objects/MediaLibrary.hpp"
+#include "database/objects/Medium.hpp"
 #include "database/objects/Release.hpp"
 #include "database/objects/Track.hpp"
 #include "database/objects/TrackArtistLink.hpp"

src/libs/database/impl/objects/Release.cpp

@@ -30,6 +30,7 @@
 #include "database/objects/Cluster.hpp"
 #include "database/objects/Directory.hpp"
 #include "database/objects/MediaLibrary.hpp"
+#include "database/objects/Medium.hpp"
 #include "database/objects/Track.hpp"
 #include "database/objects/TrackArtistLink.hpp"
 #include "database/objects/TrackEmbeddedImage.hpp"
@@ -577,28 +578,6 @@ namespace lms::db
         return utils::fetchQuerySingleResult(createQuery<int>(session, "COUNT(DISTINCT r.id)", params));
     }
 
-    std::size_t Release::getDiscCount() const
-    {
-        assert(session());
-        int res{ utils::fetchQuerySingleResult(session()->query<int>("SELECT COUNT(DISTINCT disc_number) FROM track t").where("t.release_id = ?").bind(getId())) };
-        return res;
-    }
-
-    std::vector<DiscInfo> Release::getDiscs() const
-    {
-        assert(session());
-
-        using ResultType = std::tuple<int, std::string>;
-        const auto query{ session()->query<ResultType>("SELECT DISTINCT disc_number, disc_subtitle FROM track t").where("t.release_id = ?").bind(getId()).orderBy("disc_number") };
-
-        std::vector<DiscInfo> discs;
-        utils::forEachQueryResult(query, [&](ResultType&& res) {
-            discs.emplace_back(DiscInfo{ static_cast<std::size_t>(std::get<int>(res)), std::move(std::get<std::string>(res)) });
-        });
-
-        return discs;
-    }
-
     core::PartialDateTime Release::getDate() const
     {
         return getDate(false);
@@ -753,6 +732,18 @@ namespace lms::db
         return _preferredArtwork.id();
     }
 
+    std::vector<ObjectPtr<Medium>> Release::getMediums() const
+    {
+        assert(session());
+
+        // Select the similar releases using the 5 most used clusters of the release
+        auto query{ session()->query<Wt::Dbo::ptr<Medium>>("SELECT m from medium m") };
+        query.where("m.release_id = ?").bind(getId());
+        query.orderBy("m.position");
+
+        return utils::fetchQueryResults<Medium::pointer>(query);
+    }
+
     void Release::clearLabels()
     {
         _labels.clear();
@@ -794,11 +785,6 @@ namespace lms::db
         return getArtists().size() > 1;
     }
 
-    bool Release::hasDiscSubtitle() const
-    {
-        return utils::fetchQuerySingleResult(session()->query<int>("SELECT EXISTS (SELECT 1 FROM track WHERE disc_subtitle IS NOT NULL AND disc_subtitle <> '' AND release_id = ?)").bind(getId()));
-    }
-
     std::size_t Release::getTrackCount() const
     {
         assert(session());

src/libs/database/impl/objects/Track.cpp

@@ -24,11 +24,13 @@
 
 #include "core/ILogger.hpp"
 #include "database/Session.hpp"
+#include "database/Types.hpp"
 #include "database/objects/Artist.hpp"
 #include "database/objects/Artwork.hpp"
 #include "database/objects/Cluster.hpp"
 #include "database/objects/Directory.hpp"
 #include "database/objects/MediaLibrary.hpp"
+#include "database/objects/Medium.hpp"
 #include "database/objects/Release.hpp"
 #include "database/objects/TrackArtistLink.hpp"
 #include "database/objects/TrackEmbeddedImage.hpp"
@@ -146,6 +148,9 @@ namespace lms::db
                 query.where("r.name = ?").bind(params.releaseName);
             }
 
+            if (params.medium.isValid())
+                query.where("t.medium_id = ?").bind(params.medium);
+
             if (params.trackList.isValid() || params.sortMethod == TrackSortMethod::TrackList)
             {
                 query.join("tracklist t_l ON t_l_e.tracklist_id = t_l.id");
@@ -156,8 +161,11 @@ namespace lms::db
             if (params.trackNumber)
                 query.where("t.track_number = ?").bind(*params.trackNumber);
 
-            if (params.discNumber)
-                query.where("t.disc_number = ?").bind(*params.discNumber);
+            if (params.sortMethod == TrackSortMethod::DateDescAndRelease
+                || params.sortMethod == TrackSortMethod::Release)
+            {
+                query.join("medium m ON t.medium_id = m.id");
+            }
 
             if (params.filters.mediaLibrary.isValid())
                 query.where("t.media_library_id = ?").bind(params.filters.mediaLibrary);
@@ -213,16 +221,19 @@ namespace lms::db
                 query.orderBy("t.absolute_file_path COLLATE NOCASE");
                 break;
             case TrackSortMethod::DateDescAndRelease:
-                query.orderBy("t.date DESC,t.release_id,t.disc_number,t.track_number");
+                query.orderBy("t.date DESC,t.release_id,m.position,t.track_number");
                 break;
             case TrackSortMethod::Release:
-                query.orderBy("t.disc_number,t.track_number");
+                query.orderBy("m.position,t.track_number");
                 break;
             case TrackSortMethod::TrackList:
                 assert(params.trackList.isValid());
                 query.orderBy("t_l_e.id");
+                break;
+            case TrackSortMethod::TrackNumber:
+                query.orderBy("t.track_number");
+                break;
             }
-
             return query;
         }
 
@@ -360,7 +371,7 @@ namespace lms::db
     {
         session.checkReadTransaction();
 
-        auto query{ session.getDboSession()->query<TrackId>("SELECT track.id FROM track WHERE mbid in (SELECT mbid FROM track WHERE mbid <> '' GROUP BY mbid HAVING COUNT (*) > 1)").orderBy("track.release_id,track.disc_number,track.track_number,track.mbid") };
+        auto query{ session.getDboSession()->query<TrackId>("SELECT track.id FROM track WHERE mbid in (SELECT mbid FROM track WHERE mbid <> '' GROUP BY mbid HAVING COUNT (*) > 1)").orderBy("track.release_id,track.mbid") };
 
         return utils::execRangeQuery<TrackId>(query, range);
     }

src/libs/database/impl/objects/TrackEmbeddedImage.cpp

@@ -43,8 +43,7 @@ namespace lms::db
 
             auto query{ session.getDboSession()->query<Wt::Dbo::ptr<TrackEmbeddedImage>>("SELECT t_e_i FROM track_embedded_image t_e_i") };
 
-            if (params.artist.isValid()
-                || params.discNumber.has_value()
+            if (params.medium.isValid()
                 || params.track.isValid()
                 || params.release.isValid()
                 || params.trackList.isValid()
@@ -54,39 +53,27 @@ namespace lms::db
             {
                 query.join("track_embedded_image_link t_e_i_l ON t_e_i_l.track_embedded_image_id = t_e_i.id");
 
-                if (params.artist.isValid())
-                {
-                    query.join("track_artist_link t_a_l ON t_a_l.track_id = t_e_i_l.track_id");
-                    query.where("t_a_l.artist_id = ?").bind(params.artist);
-
-                    if (!params.trackArtistLinkTypes.empty())
-                    {
-                        std::string clause{ "t_a_l.type IN (" };
-                        for (const auto& type : params.trackArtistLinkTypes)
-                        {
-                            if (clause.back() != '(')
-                                clause += ",";
-                            clause += "?";
-                            query.bind(type);
-                        }
-                        clause += ")";
-                        query.where(clause);
-                    }
-                }
-
                 if (params.track.isValid())
                     query.where("t_e_i_l.track_id = ?").bind(params.track);
 
                 if (params.release.isValid()
-                    || params.discNumber.has_value()
+                    || params.medium.isValid()
                     || params.sortMethod == TrackEmbeddedImageSortMethod::DiscNumberThenTrackNumberThenSizeDesc
                     || params.sortMethod == TrackEmbeddedImageSortMethod::TrackNumberThenSizeDesc)
                 {
+                    assert(!(params.release.isValid() && params.medium.isValid()));
+
+                    assert((params.sortMethod != TrackEmbeddedImageSortMethod::DiscNumberThenTrackNumberThenSizeDesc || params.release.isValid()));
+                    assert((params.sortMethod != TrackEmbeddedImageSortMethod::TrackNumberThenSizeDesc || params.medium.isValid()));
+
                     query.join("track t ON t_e_i_l.track_id = t.id");
                     if (params.release.isValid())
                         query.where("t.release_id = ?").bind(params.release);
-                    if (params.discNumber.has_value())
-                        query.where("t.disc_number = ?").bind(params.discNumber.value());
+                    if (params.medium.isValid())
+                        query.where("t.medium_id = ?").bind(params.medium);
+
+                    if (params.sortMethod == TrackEmbeddedImageSortMethod::DiscNumberThenTrackNumberThenSizeDesc)
+                        query.join("medium m ON m.id = t.medium_id");
                 }
 
                 if (params.trackList.isValid())
@@ -107,7 +94,7 @@ namespace lms::db
                 query.orderBy("t_e_i.size DESC");
                 break;
             case TrackEmbeddedImageSortMethod::DiscNumberThenTrackNumberThenSizeDesc:
-                query.orderBy("t.disc_number, t.track_number, t_e_i.size DESC");
+                query.orderBy("m.position, t.track_number, t_e_i.size DESC");
                 break;
             case TrackEmbeddedImageSortMethod::TrackNumberThenSizeDesc:
                 query.orderBy("t.track_number, t_e_i.size DESC");

src/libs/database/include/database/Types.hpp

@@ -119,12 +119,6 @@ namespace lms::db
         int end{};
     };
 
-    struct DiscInfo
-    {
-        std::size_t position;
-        std::string name;
-    };
-
     struct FileInfo
     {
         Wt::WDateTime lastWrittenTime;
@@ -163,6 +157,12 @@ namespace lms::db
         Name,
     };
 
+    enum class MediumSortMethod
+    {
+        None,
+        PositionAsc,
+    };
+
     enum class ReleaseSortMethod
     {
         None,
@@ -215,6 +215,7 @@ namespace lms::db
         DateDescAndRelease,
         Release,   // order by disc/track number
         TrackList, // order by asc order in tracklist
+        TrackNumber,
     };
 
     enum class TrackLyricsSortMethod

src/libs/database/include/database/objects/Medium.hpp

@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) 2025 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 <functional>
+#include <optional>
+#include <string>
+#include <string_view>
+
+#include <Wt/Dbo/Field.h>
+#include <Wt/Dbo/collection.h>
+
+#include "database/Object.hpp"
+#include "database/Types.hpp"
+#include "database/objects/ArtworkId.hpp"
+#include "database/objects/MediumId.hpp"
+#include "database/objects/ReleaseId.hpp"
+
+namespace lms::db
+{
+    class Artwork;
+    class Release;
+    class Session;
+    class Track;
+
+    class Medium final : public Object<Medium, MediumId>
+    {
+    public:
+        static const std::size_t maxMediaLength{ 64 };
+
+        Medium() = default;
+
+        // find
+        struct FindParameters
+        {
+            ReleaseId release;
+            MediumSortMethod sortMethod{ MediumSortMethod::None };
+            std::optional<Range> range;
+
+            FindParameters& setRelease(ReleaseId _release)
+            {
+                release = _release;
+                return *this;
+            }
+            FindParameters& setSortMethod(MediumSortMethod _sortMethod)
+            {
+                sortMethod = _sortMethod;
+                return *this;
+            }
+            FindParameters& setRange(std::optional<Range> _range)
+            {
+                range = _range;
+                return *this;
+            }
+        };
+
+        static std::size_t getCount(Session& session);
+        static pointer find(Session& session, MediumId id);
+        static pointer find(Session& session, ReleaseId id, std::optional<std::size_t> position);
+        static void find(Session& session, const FindParameters& params, std::function<void(const pointer&)> func);
+
+        // getters
+        std::string_view getName() const { return _name; }
+        std::optional<std::size_t> getPosition() const { return _position; }
+        std::optional<std::size_t> getTrackCount() const { return _trackCount; } // not necessarily the number of tracks in the medium, but the number of tracks that should be in the medium
+        std::string_view getMedia() const { return _media; }
+        std::optional<float> getReplayGain() const { return _replayGain; }
+        ReleaseId getReleaseId() const { return _release.id(); }
+        ObjectPtr<Release> getRelease() const { return _release; }
+        ObjectPtr<Artwork> getPreferredArtwork() const { return _preferredArtwork; }
+        ArtworkId getPreferredArtworkId() const { return _preferredArtwork.id(); }
+
+        // setters
+        void setName(std::string_view name) { _name = name; }
+        void setPosition(std::optional<std::size_t> position) { _position = position; }
+        void setTrackCount(std::optional<std::size_t> trackCount) { _trackCount = trackCount; }
+        void setMedia(std::string_view media) { _media = media; }
+        void setReplayGain(std::optional<float> replayGain) { _replayGain = replayGain; }
+
+        template<class Action>
+        void persist(Action& a)
+        {
+            Wt::Dbo::field(a, _name, "name");
+            Wt::Dbo::field(a, _position, "position");
+            Wt::Dbo::field(a, _trackCount, "track_count");
+            Wt::Dbo::field(a, _media, "media");
+            Wt::Dbo::field(a, _replayGain, "replay_gain");
+
+            Wt::Dbo::belongsTo(a, _release, "release", Wt::Dbo::OnDeleteCascade);
+            Wt::Dbo::belongsTo(a, _preferredArtwork, "preferred_artwork", Wt::Dbo::OnDeleteSetNull);
+            Wt::Dbo::hasMany(a, _tracks, Wt::Dbo::ManyToOne, "medium");
+        }
+
+    private:
+        friend class Session;
+        Medium(ObjectPtr<Release> release);
+        static pointer create(Session& session, ObjectPtr<Release> release);
+
+        std::string _name;
+        std::optional<int> _position; // position in the release
+        std::optional<int> _trackCount;
+        std::string _media; // CD, etc.
+        std::optional<float> _replayGain;
+
+        Wt::Dbo::ptr<Release> _release;
+        Wt::Dbo::ptr<Artwork> _preferredArtwork;
+        Wt::Dbo::collection<Wt::Dbo::ptr<Track>> _tracks; // tracks that match this medium
+    };
+} // namespace lms::db

src/libs/database/include/database/objects/MediumId.hpp

@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2024 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/IdType.hpp"
+
+LMS_DECLARE_IDTYPE(MediumId)

src/libs/database/include/database/objects/Release.hpp

@@ -51,6 +51,7 @@ namespace lms::db
     class Artwork;
     class Cluster;
     class ClusterType;
+    class Medium;
     class Release;
     class Session;
     class Track;
@@ -282,9 +283,7 @@ namespace lms::db
         std::string_view getSortName() const { return _sortName; }
         std::optional<core::UUID> getMBID() const { return core::UUID::fromString(_MBID); }
         std::optional<core::UUID> getGroupMBID() const { return core::UUID::fromString(_groupMBID); }
-        std::optional<std::size_t> getTotalDisc() const { return _totalDisc; }
-        std::size_t getDiscCount() const; // may not be total disc (if incomplete for example)
-        std::vector<DiscInfo> getDiscs() const;
+        std::optional<std::size_t> getTotalDisc() const { return _totalDisc; } // the number of discs this release should have if complete
         std::chrono::milliseconds getDuration() const;
         Wt::WDateTime getAddedTime() const;
         Wt::WDateTime getLastWrittenTime() const;
@@ -301,6 +300,7 @@ namespace lms::db
         std::string_view getComment() const { return _comment; }
         ObjectPtr<Artwork> getPreferredArtwork() const;
         ArtworkId getPreferredArtworkId() const;
+        std::vector<ObjectPtr<Medium>> getMediums() const;
 
         // Setters
         void setName(std::string_view name) { _name = name; }
@@ -326,7 +326,6 @@ namespace lms::db
         std::vector<ObjectPtr<Artist>> getReleaseArtists() const { return getArtists(TrackArtistLinkType::ReleaseArtist); }
         bool hasVariousArtists() const;
         std::vector<pointer> getSimilarReleases(std::optional<std::size_t> offset = {}, std::optional<std::size_t> count = {}) const;
-        bool hasDiscSubtitle() const;
 
         template<class Action>
         void persist(Action& a)

src/libs/database/include/database/objects/Track.hpp

@@ -43,6 +43,7 @@
 #include "database/objects/DirectoryId.hpp"
 #include "database/objects/Filters.hpp"
 #include "database/objects/MediaLibraryId.hpp"
+#include "database/objects/MediumId.hpp"
 #include "database/objects/ReleaseId.hpp"
 #include "database/objects/TrackEmbeddedImageId.hpp"
 #include "database/objects/TrackId.hpp"
@@ -58,6 +59,7 @@ namespace lms::db
     class Directory;
     class TrackEmbeddedImageLink;
     class MediaLibrary;
+    class Medium;
     class Release;
     class Session;
     class TrackArtistLink;
@@ -82,11 +84,11 @@ namespace lms::db
             std::string artistName;                                  // only tracks that involve this artist name
             core::EnumSet<TrackArtistLinkType> trackArtistLinkTypes; //    and for these link types
             bool nonRelease{};                                       // only tracks that do not belong to a release
+            MediumId medium;                                         // matching this medium
             ReleaseId release;                                       // matching this release
             std::string releaseName;                                 // matching this release name
             TrackListId trackList;                                   // matching this trackList
             std::optional<int> trackNumber;                          // matching this track number
-            std::optional<int> discNumber;                           // matching this disc number
             DirectoryId directory;                                   // if set, tracks in this directory
             std::optional<std::size_t> fileSize;                     // if set, tracks that match this file size
             TrackEmbeddedImageId embeddedImageId;                    // if set, tracks that have this embedded image
@@ -144,6 +146,11 @@ namespace lms::db
                 nonRelease = _nonRelease;
                 return *this;
             }
+            FindParameters& setMedium(MediumId _medium)
+            {
+                medium = _medium;
+                return *this;
+            }
             FindParameters& setRelease(ReleaseId _release)
             {
                 release = _release;
@@ -164,11 +171,6 @@ namespace lms::db
                 trackNumber = _trackNumber;
                 return *this;
             }
-            FindParameters& setDiscNumber(int _discNumber)
-            {
-                discNumber = _discNumber;
-                return *this;
-            }
             FindParameters& setDirectory(DirectoryId _directory)
             {
                 directory = _directory;
@@ -217,9 +219,6 @@ namespace lms::db
         // Accessors
         void setScanVersion(std::size_t version) { _scanVersion = version; }
         void setTrackNumber(std::optional<int> num) { _trackNumber = num; }
-        void setDiscNumber(std::optional<int> num) { _discNumber = num; }
-        void setTotalTrack(std::optional<int> totalTrack) { _totalTrack = totalTrack; }
-        void setDiscSubtitle(std::string_view name) { _discSubtitle = name; }
         void setName(std::string_view name);
         void setAbsoluteFilePath(const std::filesystem::path& filePath);
         void setFileSize(std::size_t fileSize) { _fileSize = fileSize; }
@@ -237,13 +236,13 @@ namespace lms::db
         void setCopyright(std::string_view copyright);
         void setCopyrightURL(std::string_view copyrightURL);
         void setAdvisory(Advisory advisory) { _advisory = advisory; }
-        void setTrackReplayGain(std::optional<float> replayGain) { _trackReplayGain = replayGain; }
-        void setReleaseReplayGain(std::optional<float> replayGain) { _releaseReplayGain = replayGain; } // may be by disc!
+        void setReplayGain(std::optional<float> replayGain) { _replayGain = replayGain; }
         void setArtistDisplayName(std::string_view name) { _artistDisplayName = name; }
         void setComment(std::string_view comment) { _comment = comment; }
         void clearArtistLinks();
         void addArtistLink(const ObjectPtr<TrackArtistLink>& artistLink);
         void setRelease(ObjectPtr<Release> release) { _release = getDboPtr(release); }
+        void setMedium(ObjectPtr<Medium> medium) { _medium = getDboPtr(medium); }
         void setClusters(const std::vector<ObjectPtr<Cluster>>& clusters);
         void clearLyrics();
         void clearEmbeddedLyrics();
@@ -257,9 +256,6 @@ namespace lms::db
 
         std::size_t getScanVersion() const { return _scanVersion; }
         std::optional<std::size_t> getTrackNumber() const { return _trackNumber; }
-        std::optional<std::size_t> getTotalTrack() const { return _totalTrack; }
-        std::optional<std::size_t> getDiscNumber() const { return _discNumber; }
-        const std::string& getDiscSubtitle() const { return _discSubtitle; }
         std::string getName() const { return _name; }
         const std::filesystem::path& getAbsoluteFilePath() const { return _absoluteFilePath; }
         long long getFileSize() const { return _fileSize; }
@@ -281,8 +277,7 @@ namespace lms::db
         std::optional<std::string> getCopyright() const;
         std::optional<std::string> getCopyrightURL() const;
         Advisory getAdvisory() const { return _advisory; }
-        std::optional<float> getTrackReplayGain() const { return _trackReplayGain; }
-        std::optional<float> getReleaseReplayGain() const { return _releaseReplayGain; }
+        std::optional<float> getReplayGain() const { return _replayGain; }
         std::string_view getArtistDisplayName() const { return _artistDisplayName; }
         std::string_view getComment() const { return _comment; }
 
@@ -292,6 +287,8 @@ namespace lms::db
         std::vector<ObjectPtr<TrackArtistLink>> getArtistLinks() const;
         ReleaseId getReleaseId() const { return _release.id(); }
         ObjectPtr<Release> getRelease() const { return _release; }
+        MediumId getMediumId() const { return _medium.id(); }
+        ObjectPtr<Medium> getMedium() const { return _medium; }
         std::vector<ObjectPtr<Cluster>> getClusters() const;
         std::vector<ClusterId> getClusterIds() const;
         ObjectPtr<MediaLibrary> getMediaLibrary() const;
@@ -308,9 +305,6 @@ namespace lms::db
         {
             Wt::Dbo::field(a, _scanVersion, "scan_version");
             Wt::Dbo::field(a, _trackNumber, "track_number");
-            Wt::Dbo::field(a, _discNumber, "disc_number");
-            Wt::Dbo::field(a, _totalTrack, "total_track");     // here in Track since Release does not have concept of "disc" (yet?)
-            Wt::Dbo::field(a, _discSubtitle, "disc_subtitle"); // here in Track since Release does not have concept of "disc" (yet?)
             Wt::Dbo::field(a, _name, "name");
             Wt::Dbo::field(a, _duration, "duration");
             Wt::Dbo::field(a, _bitrate, "bitrate");
@@ -328,11 +322,11 @@ namespace lms::db
             Wt::Dbo::field(a, _copyright, "copyright");
             Wt::Dbo::field(a, _copyrightURL, "copyright_url");
             Wt::Dbo::field(a, _advisory, "advisory");
-            Wt::Dbo::field(a, _trackReplayGain, "track_replay_gain");
-            Wt::Dbo::field(a, _releaseReplayGain, "release_replay_gain"); // here in Track since Release does not have concept of "disc" (yet?)
+            Wt::Dbo::field(a, _replayGain, "replay_gain");
             Wt::Dbo::field(a, _artistDisplayName, "artist_display_name");
             Wt::Dbo::field(a, _comment, "comment"); // TODO: move in a dedicated table
 
+            Wt::Dbo::belongsTo(a, _medium, "medium", Wt::Dbo::OnDeleteCascade);
             Wt::Dbo::belongsTo(a, _release, "release", Wt::Dbo::OnDeleteCascade);
             Wt::Dbo::belongsTo(a, _mediaLibrary, "media_library", Wt::Dbo::OnDeleteSetNull); // don't delete track on media library removal, we want to wait for the next scan to have a chance to migrate files
             Wt::Dbo::belongsTo(a, _directory, "directory", Wt::Dbo::OnDeleteCascade);
@@ -353,10 +347,7 @@ namespace lms::db
         static constexpr std::size_t _maxCopyrightURLLength{ 512 };
 
         int _scanVersion{};
-        std::optional<int> _trackNumber{};
-        std::optional<int> _discNumber{};
-        std::optional<int> _totalTrack{};
-        std::string _discSubtitle;
+        std::optional<int> _trackNumber;
         std::string _name;
         int _bitrate{}; // in bps
         int _bitsPerSample{};
@@ -374,10 +365,10 @@ namespace lms::db
         std::string _copyright;
         std::string _copyrightURL;
         Advisory _advisory{ Advisory::UnSet };
-        std::optional<float> _trackReplayGain;
-        std::optional<float> _releaseReplayGain;
+        std::optional<float> _replayGain;
         std::string _artistDisplayName;
         std::string _comment;
+        Wt::Dbo::ptr<Medium> _medium;
         Wt::Dbo::ptr<Release> _release;
         Wt::Dbo::ptr<MediaLibrary> _mediaLibrary;
         Wt::Dbo::ptr<Directory> _directory;

src/libs/database/include/database/objects/TrackEmbeddedImage.hpp

@@ -26,10 +26,9 @@
 #include <Wt/Dbo/Field.h>
 #include <Wt/Dbo/collection.h>
 
-#include "core/EnumSet.hpp"
 #include "database/Object.hpp"
 #include "database/Types.hpp"
-#include "database/objects/ArtistId.hpp"
+#include "database/objects/MediumId.hpp"
 #include "database/objects/ReleaseId.hpp"
 #include "database/objects/TrackEmbeddedImageId.hpp"
 #include "database/objects/TrackId.hpp"
@@ -49,11 +48,9 @@ namespace lms::db
         struct FindParameters
         {
             std::optional<Range> range;
-            ArtistId artist;
-            core::EnumSet<TrackArtistLinkType> trackArtistLinkTypes;
             TrackId track;
             ReleaseId release;
-            std::optional<int> discNumber;
+            MediumId medium;
             TrackListId trackList;
             std::optional<ImageType> imageType;
             TrackEmbeddedImageSortMethod sortMethod{ TrackEmbeddedImageSortMethod::None };
@@ -63,13 +60,6 @@ namespace lms::db
                 range = _range;
                 return *this;
             }
-            FindParameters& setArtist(ArtistId _artist, core::EnumSet<TrackArtistLinkType> _trackArtistLinkTypes = {})
-            {
-                artist = _artist;
-                trackArtistLinkTypes = _trackArtistLinkTypes;
-                return *this;
-            }
-
             FindParameters& setTrack(TrackId _track)
             {
                 track = _track;
@@ -80,9 +70,9 @@ namespace lms::db
                 release = _release;
                 return *this;
             }
-            FindParameters& setDiscNumber(std::optional<int> _discNumber)
+            FindParameters& setMedium(MediumId _medium)
             {
-                discNumber = _discNumber;
+                medium = _medium;
                 return *this;
             }
             FindParameters& setTrackList(TrackListId _trackList)

src/libs/database/test/CMakeLists.txt

@@ -10,6 +10,7 @@ add_executable(test-database
 	Directory.cpp
 	Image.cpp
 	Listen.cpp
+	Medium.cpp
 	Migration.cpp
 	PlayListFile.cpp
 	RatedArtist.cpp

src/libs/database/test/Medium.cpp

@@ -0,0 +1,195 @@
+/*
+ * Copyright (C) 2024 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 "Common.hpp"
+
+#include "database/Types.hpp"
+#include "database/objects/Medium.hpp"
+#include "database/objects/Track.hpp"
+
+namespace lms::db::tests
+{
+    using ScopedMedium = ScopedEntity<db::Medium>;
+
+    TEST_F(DatabaseFixture, Medium)
+    {
+        ScopedRelease release{ session, "MyRelease" };
+
+        {
+            auto transaction{ session.createReadTransaction() };
+
+            EXPECT_EQ(Medium::getCount(session), 0);
+
+            Medium::pointer medium{ Medium::find(session, MediumId{}) };
+            ASSERT_EQ(medium, Medium::pointer{});
+        }
+
+        ScopedMedium medium{ session, release.lockAndGet() };
+
+        {
+            auto transaction{ session.createReadTransaction() };
+
+            EXPECT_EQ(Medium::getCount(session), 1);
+
+            Medium::pointer foundMedium{ Medium::find(session, medium.getId()) };
+            ASSERT_NE(foundMedium, Medium::pointer{});
+            EXPECT_EQ(foundMedium->getReleaseId(), release.getId());
+            EXPECT_EQ(foundMedium->getPosition(), std::nullopt);
+            EXPECT_EQ(foundMedium->getMedia(), "");
+            EXPECT_EQ(foundMedium->getName(), "");
+        }
+
+        {
+            auto transaction{ session.createWriteTransaction() };
+
+            medium.get().modify()->setName("MySubtitle");
+            medium.get().modify()->setPosition(1);
+            medium.get().modify()->setMedia("MyMedia");
+        }
+
+        {
+            auto transaction{ session.createReadTransaction() };
+
+            Medium::pointer foundMedium{ Medium::find(session, medium.getId()) };
+            ASSERT_NE(foundMedium, Medium::pointer{});
+            EXPECT_EQ(foundMedium->getName(), "MySubtitle");
+            EXPECT_EQ(foundMedium->getPosition(), 1);
+            EXPECT_EQ(foundMedium->getMedia(), "MyMedia");
+        }
+    }
+
+    TEST_F(DatabaseFixture, MediumFindByRelease_noPosition)
+    {
+        ScopedRelease release{ session, "MyRelease" };
+
+        {
+            auto transaction{ session.createReadTransaction() };
+
+            Medium::pointer foundMedium{ Medium::find(session, release.getId(), std::nullopt) };
+            ASSERT_EQ(foundMedium, Medium::pointer{});
+        }
+
+        ScopedMedium medium{ session, release.lockAndGet() };
+
+        {
+            auto transaction{ session.createReadTransaction() };
+
+            Medium::pointer foundMedium{ Medium::find(session, release.getId(), std::nullopt) };
+            ASSERT_NE(foundMedium, Medium::pointer{});
+            EXPECT_EQ(foundMedium->getId(), medium.getId());
+        }
+    }
+
+    TEST_F(DatabaseFixture, MediumFindByRelease_withPosition)
+    {
+        ScopedRelease release{ session, "MyRelease" };
+
+        ScopedMedium medium{ session, release.lockAndGet() };
+
+        {
+            auto transaction{ session.createReadTransaction() };
+
+            Medium::pointer foundMedium{ Medium::find(session, release.getId(), 1) };
+            ASSERT_EQ(foundMedium, Medium::pointer{});
+        }
+
+        {
+            auto transaction{ session.createWriteTransaction() };
+
+            medium.get().modify()->setPosition(1);
+        }
+
+        {
+            auto transaction{ session.createReadTransaction() };
+
+            Medium::pointer foundMedium{ Medium::find(session, release.getId(), 1) };
+            ASSERT_NE(foundMedium, Medium::pointer{});
+            EXPECT_EQ(foundMedium->getId(), medium.getId());
+        }
+    }
+
+    TEST_F(DatabaseFixture, Medium_findTracksByMedium)
+    {
+        ScopedRelease release{ session, "MyRelease" };
+        ScopedMedium medium{ session, release.lockAndGet() };
+
+        {
+            auto transaction{ session.createReadTransaction() };
+
+            db::Track::FindParameters params;
+            params.setMedium(medium.getId());
+            params.setSortMethod(db::TrackSortMethod::TrackNumber);
+
+            bool visited{};
+            db::Track::find(session, params, [&](const db::Track::pointer&) {
+                visited = true;
+            });
+            EXPECT_FALSE(visited);
+        }
+
+        ScopedTrack track1{ session };
+        ScopedTrack track2{ session };
+
+        {
+            auto transaction{ session.createWriteTransaction() };
+            track1.get().modify()->setRelease(release.get());
+            track2.get().modify()->setRelease(release.get());
+        }
+
+        {
+            auto transaction{ session.createReadTransaction() };
+
+            db::Track::FindParameters params;
+            params.setMedium(medium.getId());
+            params.setSortMethod(db::TrackSortMethod::TrackNumber);
+
+            bool visited{};
+            db::Track::find(session, params, [&](const db::Track::pointer&) {
+                visited = true;
+            });
+            EXPECT_FALSE(visited);
+        }
+
+        {
+            auto transaction{ session.createWriteTransaction() };
+            track1.get().modify()->setMedium(medium.get());
+            track2.get().modify()->setMedium(medium.get());
+
+            track1.get().modify()->setTrackNumber(3);
+            track2.get().modify()->setTrackNumber(1);
+        }
+
+        {
+            auto transaction{ session.createReadTransaction() };
+
+            db::Track::FindParameters params;
+            params.setMedium(medium.getId());
+            params.setSortMethod(db::TrackSortMethod::TrackNumber);
+
+            std::vector<db::TrackId> visitedTrackIds;
+            db::Track::find(session, params, [&](const db::Track::pointer& track) {
+                visitedTrackIds.push_back(track->getId());
+            });
+            ASSERT_EQ(visitedTrackIds.size(), 2);
+            EXPECT_EQ(visitedTrackIds[0], track2.getId());
+            EXPECT_EQ(visitedTrackIds[1], track1.getId());
+        }
+    }
+
+} // namespace lms::db::tests

src/libs/database/test/Migration.cpp

@@ -25,6 +25,7 @@
 #include "database/objects/AuthToken.hpp"
 #include "database/objects/Directory.hpp"
 #include "database/objects/Image.hpp"
+#include "database/objects/Medium.hpp"
 #include "database/objects/PlayListFile.hpp"
 #include "database/objects/PlayQueue.hpp"
 #include "database/objects/RatedArtist.hpp"
@@ -353,6 +354,7 @@ VALUES
             EXPECT_FALSE(TrackEmbeddedImage::find(session, TrackEmbeddedImageId{}));
             EXPECT_FALSE(TrackEmbeddedImageLink::find(session, TrackEmbeddedImageLinkId{}));
             EXPECT_FALSE(Image::find(session, ImageId{}));
+            EXPECT_FALSE(Medium::find(session, MediumId{}));
             EXPECT_FALSE(Label::find(session, LabelId{}));
             EXPECT_FALSE(Listen::find(session, ListenId{}));
             EXPECT_FALSE(PlayListFile::find(session, PlayListFileId{}));

src/libs/database/test/Release.cpp

@@ -22,13 +22,15 @@
 #include "core/PartialDateTime.hpp"
 #include "database/objects/Artwork.hpp"
 #include "database/objects/Image.hpp"
+#include "database/objects/Medium.hpp"
 
 namespace lms::db::tests
 {
     using ScopedArtwork = ScopedEntity<db::Artwork>;
+    using ScopedCountry = ScopedEntity<db::Country>;
     using ScopedImage = ScopedEntity<db::Image>;
     using ScopedLabel = ScopedEntity<db::Label>;
-    using ScopedCountry = ScopedEntity<db::Country>;
+    using ScopedMedium = ScopedEntity<db::Medium>;
     using ScopedReleaseType = ScopedEntity<db::ReleaseType>;
 
     TEST_F(DatabaseFixture, Release)
@@ -438,15 +440,12 @@ namespace lms::db::tests
         {
             auto transaction{ session.createWriteTransaction() };
 
-            track1.get().modify()->setTotalTrack(36);
             release1.get().modify()->setTotalDisc(6);
         }
 
         {
             auto transaction{ session.createReadTransaction() };
 
-            ASSERT_TRUE(track1->getTotalTrack());
-            EXPECT_EQ(*track1->getTotalTrack(), 36);
             ASSERT_TRUE(release1->getTotalDisc());
             EXPECT_EQ(*release1->getTotalDisc(), 6);
         }
@@ -456,15 +455,12 @@ namespace lms::db::tests
             auto transaction{ session.createWriteTransaction() };
 
             track2.get().modify()->setRelease(release1.get());
-            track2.get().modify()->setTotalTrack(37);
             release1.get().modify()->setTotalDisc(67);
         }
 
         {
             auto transaction{ session.createReadTransaction() };
 
-            ASSERT_TRUE(track1->getTotalTrack());
-            EXPECT_EQ(*track1->getTotalTrack(), 36);
             ASSERT_TRUE(release1->getTotalDisc());
             EXPECT_EQ(*release1->getTotalDisc(), 67);
         }
@@ -481,18 +477,13 @@ namespace lms::db::tests
             auto transaction{ session.createWriteTransaction() };
 
             track3.get().modify()->setRelease(release2.get());
-            track3.get().modify()->setTotalTrack(7);
             release2.get().modify()->setTotalDisc(5);
         }
         {
             auto transaction{ session.createReadTransaction() };
 
-            ASSERT_TRUE(track1->getTotalTrack());
-            EXPECT_EQ(*track1->getTotalTrack(), 36);
             ASSERT_TRUE(release1->getTotalDisc());
             EXPECT_EQ(*release2->getTotalDisc(), 5);
-            ASSERT_TRUE(track3->getTotalTrack());
-            EXPECT_EQ(*track3->getTotalTrack(), 7);
             ASSERT_TRUE(release2->getTotalDisc());
             EXPECT_EQ(*release2->getTotalDisc(), 5);
         }
@@ -501,7 +492,11 @@ namespace lms::db::tests
     TEST_F(DatabaseFixture, MultiTracksSingleReleaseFirstTrack)
     {
         ScopedRelease release1{ session, "MyRelease1" };
+        ScopedMedium medium1A{ session, release1.lockAndGet() };
+        ScopedMedium medium1B{ session, release1.lockAndGet() };
         ScopedRelease release2{ session, "MyRelease2" };
+        ScopedMedium medium2A{ session, release2.lockAndGet() };
+        ScopedMedium medium2B{ session, release2.lockAndGet() };
 
         ScopedTrack track1A{ session };
         ScopedTrack track1B{ session };
@@ -519,17 +514,21 @@ namespace lms::db::tests
             auto transaction{ session.createWriteTransaction() };
 
             track1A.get().modify()->setRelease(release1.get());
+            track1A.get().modify()->setMedium(medium1A.get());
+
             track1B.get().modify()->setRelease(release1.get());
+            track1B.get().modify()->setMedium(medium1B.get());
+
             track2A.get().modify()->setRelease(release2.get());
+            track2A.get().modify()->setMedium(medium2A.get());
             track2B.get().modify()->setRelease(release2.get());
+            track2B.get().modify()->setMedium(medium2B.get());
 
             track1A.get().modify()->setTrackNumber(1);
             track1B.get().modify()->setTrackNumber(2);
 
-            track2A.get().modify()->setDiscNumber(2);
             track2A.get().modify()->setTrackNumber(1);
             track2B.get().modify()->setTrackNumber(2);
-            track2B.get().modify()->setDiscNumber(1);
         }
 
         {
@@ -537,14 +536,16 @@ namespace lms::db::tests
 
             {
                 const auto tracks{ Track::findIds(session, Track::FindParameters{}.setRelease(release1.getId()).setSortMethod(TrackSortMethod::Release)) };
-                EXPECT_EQ(tracks.results.size(), 2);
-                EXPECT_EQ(tracks.results.front(), track1A.getId());
+                ASSERT_EQ(tracks.results.size(), 2);
+                EXPECT_EQ(tracks.results[0], track1A.getId());
+                EXPECT_EQ(tracks.results[1], track1B.getId());
             }
 
             {
                 const auto tracks{ Track::findIds(session, Track::FindParameters{}.setRelease(release2.getId()).setSortMethod(TrackSortMethod::Release)) };
-                EXPECT_EQ(tracks.results.size(), 2);
-                EXPECT_EQ(tracks.results.front(), track2B.getId());
+                ASSERT_EQ(tracks.results.size(), 2);
+                EXPECT_EQ(tracks.results[0], track2A.getId());
+                EXPECT_EQ(tracks.results[1], track2B.getId());
             }
         }
     }
@@ -815,52 +816,6 @@ namespace lms::db::tests
             EXPECT_EQ(Release::getCount(session, Release::FindParameters{}.setArtist(artist.getId())), 1);
         }
     }
-
-    TEST_F(DatabaseFixture, Release_getDiscCount)
-    {
-        ScopedRelease release{ session, "MyRelease" };
-        ScopedTrack track{ session };
-        ScopedTrack track2{ session };
-
-        {
-            auto transaction{ session.createReadTransaction() };
-            EXPECT_EQ(release.get()->getDiscCount(), 0);
-        }
-        {
-            auto transaction{ session.createWriteTransaction() };
-            track.get().modify()->setRelease(release.get());
-        }
-        {
-            auto transaction{ session.createReadTransaction() };
-            EXPECT_EQ(release.get()->getDiscCount(), 0);
-        }
-        {
-            auto transaction{ session.createWriteTransaction() };
-            track.get().modify()->setDiscNumber(5);
-        }
-        {
-            auto transaction{ session.createReadTransaction() };
-            EXPECT_EQ(release.get()->getDiscCount(), 1);
-        }
-        {
-            auto transaction{ session.createWriteTransaction() };
-            track2.get().modify()->setRelease(release.get());
-            track2.get().modify()->setDiscNumber(5);
-        }
-        {
-            auto transaction{ session.createReadTransaction() };
-            EXPECT_EQ(release.get()->getDiscCount(), 1);
-        }
-        {
-            auto transaction{ session.createWriteTransaction() };
-            track2.get().modify()->setDiscNumber(6);
-        }
-        {
-            auto transaction{ session.createReadTransaction() };
-            EXPECT_EQ(release.get()->getDiscCount(), 2);
-        }
-    }
-
     TEST_F(DatabaseFixture, Release_isCompilation)
     {
         ScopedRelease release{ session, "MyRelease" };
@@ -1549,4 +1504,43 @@ namespace lms::db::tests
         }
     }
 
+    TEST_F(DatabaseFixture, Release_mediums)
+    {
+        ScopedRelease release{ session, "MyRelease" };
+
+        {
+            auto transaction{ session.createReadTransaction() };
+
+            const auto mediums{ release->getMediums() };
+            EXPECT_EQ(mediums.size(), 0);
+        }
+
+        ScopedMedium medium2{ session, release.lockAndGet() };
+
+        {
+            auto transaction{ session.createReadTransaction() };
+
+            const auto mediums{ release->getMediums() };
+            ASSERT_EQ(mediums.size(), 1);
+            EXPECT_EQ(mediums[0]->getId(), medium2.getId());
+        }
+
+        ScopedMedium medium1{ session, release.lockAndGet() };
+
+        {
+            auto transaction{ session.createWriteTransaction() };
+
+            medium1.get().modify()->setPosition(1);
+            medium2.get().modify()->setPosition(2);
+        }
+
+        {
+            auto transaction{ session.createReadTransaction() };
+
+            const auto mediums{ release->getMediums() };
+            ASSERT_EQ(mediums.size(), 2);
+            EXPECT_EQ(mediums[0]->getId(), medium1.getId());
+            EXPECT_EQ(mediums[1]->getId(), medium2.getId());
+        }
+    }
 } // namespace lms::db::tests

src/libs/database/test/TrackEmbeddedImage.cpp

@@ -20,6 +20,7 @@
 #include <limits>
 
 #include "database/Types.hpp"
+#include "database/objects/Medium.hpp"
 #include "database/objects/TrackEmbeddedImage.hpp"
 #include "database/objects/TrackEmbeddedImageLink.hpp"
 #include "database/objects/TrackList.hpp"
@@ -28,6 +29,7 @@
 
 namespace lms::db::tests
 {
+    using ScopedMedium = ScopedEntity<db::Medium>;
     using ScopedTrackEmbeddedImage = ScopedEntity<db::TrackEmbeddedImage>;
     using ScopedTrackEmbeddedImageLink = ScopedEntity<db::TrackEmbeddedImageLink>;
 
@@ -113,6 +115,7 @@ namespace lms::db::tests
         ScopedTrackEmbeddedImage image{ session };
         ScopedTrack track{ session };
         ScopedRelease release{ session, "MyRelease" };
+        ScopedMedium medium{ session, release.lockAndGet() };
         ScopedTrackEmbeddedImageLink link{ session, track.lockAndGet(), image.lockAndGet() };
 
         {
@@ -133,6 +136,7 @@ namespace lms::db::tests
         {
             auto transaction{ session.createWriteTransaction() };
             track.get().modify()->setRelease(release.get());
+            track.get().modify()->setMedium(medium.get());
         }
 
         {
@@ -151,13 +155,24 @@ namespace lms::db::tests
             auto transaction{ session.createReadTransaction() };
 
             TrackEmbeddedImage::FindParameters params;
-            params.setTrack(track.getId());
+            params.setMedium(medium.getId());
             params.setSortMethod(TrackEmbeddedImageSortMethod::TrackNumberThenSizeDesc);
 
             bool visited{};
             TrackEmbeddedImage::find(session, params, [&](const auto&) { visited = true; });
             EXPECT_TRUE(visited);
         }
+
+        {
+            auto transaction{ session.createReadTransaction() };
+
+            TrackEmbeddedImage::FindParameters params;
+            params.setTrack(track.getId());
+
+            bool visited{};
+            TrackEmbeddedImage::find(session, params, [&](const auto&) { visited = true; });
+            EXPECT_TRUE(visited);
+        }
     }
 
     TEST_F(DatabaseFixture, TrackEmbeddedImage_findByParams_sorts)
@@ -169,6 +184,8 @@ namespace lms::db::tests
         ScopedTrack track1{ session };
         ScopedTrack track2{ session };
         ScopedRelease release{ session, "MyRelease" };
+        ScopedMedium medium1{ session, release.lockAndGet() };
+        ScopedMedium medium2{ session, release.lockAndGet() };
         ScopedTrackEmbeddedImageLink link1{ session, track1.lockAndGet(), image1.lockAndGet() };
         ScopedTrackEmbeddedImageLink link2{ session, track1.lockAndGet(), image2.lockAndGet() };
         ScopedTrackEmbeddedImageLink link3{ session, track1.lockAndGet(), image3.lockAndGet() };
@@ -176,7 +193,11 @@ namespace lms::db::tests
 
         {
             auto transaction{ session.createWriteTransaction() };
+            medium1.get().modify()->setPosition(1);
+            medium2.get().modify()->setPosition(2);
+
             track1.get().modify()->setRelease(release.get());
+            track1.get().modify()->setMedium(medium1.get());
             track1.get().modify()->setTrackNumber(2);
 
             link1.get().modify()->setType(ImageType::FrontCover);
@@ -187,6 +208,7 @@ namespace lms::db::tests
             image3.get().modify()->setSize(2000);
 
             track2.get().modify()->setRelease(release.get());
+            track2.get().modify()->setMedium(medium2.get());
             track2.get().modify()->setTrackNumber(1);
 
             link4.get().modify()->setType(ImageType::Media);
@@ -213,16 +235,15 @@ namespace lms::db::tests
             auto transaction{ session.createReadTransaction() };
 
             TrackEmbeddedImage::FindParameters params;
-            params.setRelease(release.getId());
+            params.setMedium(medium1.getId());
             params.setImageType(ImageType::Media);
             params.setSortMethod(TrackEmbeddedImageSortMethod::TrackNumberThenSizeDesc);
 
             std::vector<TrackEmbeddedImageId> visitedIds;
             TrackEmbeddedImage::find(session, params, [&](const TrackEmbeddedImage::pointer& image) { visitedIds.push_back(image->getId()); });
-            ASSERT_EQ(visitedIds.size(), 3);
-            EXPECT_EQ(visitedIds[0], image4.getId());
-            EXPECT_EQ(visitedIds[1], image3.getId());
-            EXPECT_EQ(visitedIds[2], image2.getId());
+            ASSERT_EQ(visitedIds.size(), 2);
+            EXPECT_EQ(visitedIds[0], image3.getId());
+            EXPECT_EQ(visitedIds[1], image2.getId());
         }
 
         {
@@ -236,9 +257,9 @@ namespace lms::db::tests
             std::vector<TrackEmbeddedImageId> visitedIds;
             TrackEmbeddedImage::find(session, params, [&](const TrackEmbeddedImage::pointer& image) { visitedIds.push_back(image->getId()); });
             ASSERT_EQ(visitedIds.size(), 3);
-            EXPECT_EQ(visitedIds[0], image4.getId());
-            EXPECT_EQ(visitedIds[1], image3.getId());
-            EXPECT_EQ(visitedIds[2], image2.getId());
+            EXPECT_EQ(visitedIds[0], image3.getId());
+            EXPECT_EQ(visitedIds[1], image2.getId());
+            EXPECT_EQ(visitedIds[2], image4.getId());
         }
 
         {
@@ -255,59 +276,26 @@ namespace lms::db::tests
         }
     }
 
-    TEST_F(DatabaseFixture, TrackEmbeddedImage_findByParams_artist)
-    {
-        ScopedTrackEmbeddedImage image{ session };
-        ScopedTrack track{ session };
-        ScopedArtist artist{ session, "MyArtist" };
-        ScopedTrackEmbeddedImageLink link{ session, track.lockAndGet(), image.lockAndGet() };
-
-        {
-            auto transaction{ session.createWriteTransaction() };
-            TrackArtistLink::create(session, track.get(), artist.get(), TrackArtistLinkType::Artist);
-        }
-
-        {
-            auto transaction{ session.createReadTransaction() };
-
-            TrackEmbeddedImage::FindParameters params;
-            params.setArtist(artist.getId());
-
-            bool visited{};
-            TrackEmbeddedImage::find(session, params, [&](const TrackEmbeddedImage::pointer&) { visited = true; });
-            ASSERT_TRUE(visited);
-        }
-
-        {
-            auto transaction{ session.createReadTransaction() };
-
-            TrackEmbeddedImage::FindParameters params;
-            params.setArtist(artist.getId(), { TrackArtistLinkType::ReleaseArtist });
-
-            bool visited{};
-            TrackEmbeddedImage::find(session, params, [&](const TrackEmbeddedImage::pointer&) { visited = true; });
-            ASSERT_FALSE(visited);
-        }
-    }
-
-    TEST_F(DatabaseFixture, TrackEmbeddedImage_findByParams_discNumber)
+    TEST_F(DatabaseFixture, TrackEmbeddedImage_findByParams_medium)
     {
         ScopedTrackEmbeddedImage image{ session };
         ScopedTrack track{ session };
         ScopedRelease release{ session, "MyRelease" };
+        ScopedMedium medium{ session, release.lockAndGet() };
+        ScopedMedium otherMedium{ session, release.lockAndGet() };
         ScopedTrackEmbeddedImageLink link{ session, track.lockAndGet(), image.lockAndGet() };
 
         {
             auto transaction{ session.createWriteTransaction() };
             track.get().modify()->setRelease(release.get());
-            track.get().modify()->setDiscNumber(1);
+            track.get().modify()->setMedium(medium.get());
         }
 
         {
             auto transaction{ session.createReadTransaction() };
 
             TrackEmbeddedImage::FindParameters params;
-            params.setDiscNumber(1);
+            params.setMedium(medium.getId());
 
             bool visited{};
             TrackEmbeddedImage::find(session, params, [&](const TrackEmbeddedImage::pointer&) { visited = true; });
@@ -318,7 +306,7 @@ namespace lms::db::tests
             auto transaction{ session.createReadTransaction() };
 
             TrackEmbeddedImage::FindParameters params;
-            params.setDiscNumber(2);
+            params.setMedium(2);
 
             bool visited{};
             TrackEmbeddedImage::find(session, params, [&](const TrackEmbeddedImage::pointer&) { visited = true; });

src/libs/services/scanner/impl/scanners/AudioFileScanOperation.cpp

@@ -32,6 +32,7 @@
 #include "database/objects/Cluster.hpp"
 #include "database/objects/Directory.hpp"
 #include "database/objects/MediaLibrary.hpp"
+#include "database/objects/Medium.hpp"
 #include "database/objects/Release.hpp"
 #include "database/objects/Track.hpp"
 #include "database/objects/TrackArtistLink.hpp"
@@ -222,6 +223,26 @@ namespace lms::scanner
             return release;
         }
 
+        db::Medium::pointer getOrCreateMedium(db::Session& session, const metadata::Medium& medium, const db::Release::pointer& release)
+        {
+            db::Medium::pointer dbMedium{ db::Medium::find(session, release->getId(), medium.position) };
+            if (!dbMedium)
+                dbMedium = session.create<db::Medium>(release);
+
+            if (dbMedium->getPosition() != medium.position)
+                dbMedium.modify()->setPosition(medium.position);
+            if (dbMedium->getMedia() != medium.media)
+                dbMedium.modify()->setMedia(medium.media);
+            if (dbMedium->getName() != medium.name)
+                dbMedium.modify()->setName(medium.name);
+            if (dbMedium->getTrackCount() != medium.trackCount)
+                dbMedium.modify()->setTrackCount(medium.trackCount);
+            if (dbMedium->getReplayGain() != medium.replayGain)
+                dbMedium.modify()->setReplayGain(medium.replayGain);
+
+            return dbMedium;
+        }
+
         std::vector<db::Cluster::pointer> getOrCreateClusters(db::Session& session, const metadata::Track& track)
         {
             std::vector<db::Cluster::pointer> clusters;
@@ -387,8 +408,6 @@ namespace lms::scanner
             params.setFileSize(fileSize);
             if (parsedTrack.medium)
             {
-                if (parsedTrack.medium->position)
-                    params.setDiscNumber(*parsedTrack.medium->position);
                 if (parsedTrack.medium->release)
                     params.setReleaseName(parsedTrack.medium->release->name);
             }
@@ -691,17 +710,22 @@ namespace lms::scanner
         for (const auto& [role, performers] : _parsedTrack->performerArtists)
             createTrackArtistLinks(dbSession, track, db::TrackArtistLinkType::Performer, role, performers, allowFallback);
 
+        // For now, alway tie a medium to a release, and a release mst have at least one medium, even if no disc number is set
         if (_parsedTrack->medium && _parsedTrack->medium->release)
-            track.modify()->setRelease(getOrCreateRelease(dbSession, *_parsedTrack->medium->release, directory));
+        {
+            db::Release::pointer release{ getOrCreateRelease(dbSession, *_parsedTrack->medium->release, directory) };
+            assert(release);
+            track.modify()->setRelease(release);
+            track.modify()->setMedium(getOrCreateMedium(dbSession, *_parsedTrack->medium, release));
+        }
         else
+        {
             track.modify()->setRelease({});
-        track.modify()->setTotalTrack(_parsedTrack->medium ? _parsedTrack->medium->trackCount : std::nullopt);
-        track.modify()->setReleaseReplayGain(_parsedTrack->medium ? _parsedTrack->medium->replayGain : std::nullopt);
-        track.modify()->setDiscSubtitle(_parsedTrack->medium ? _parsedTrack->medium->name : "");
+            track.modify()->setMedium({});
+        }
         track.modify()->setClusters(getOrCreateClusters(dbSession, *_parsedTrack));
         track.modify()->setName(title);
         track.modify()->setTrackNumber(_parsedTrack->position);
-        track.modify()->setDiscNumber(_parsedTrack->medium ? _parsedTrack->medium->position : std::nullopt);
         track.modify()->setDate(_parsedTrack->date);
         track.modify()->setOriginalDate(_parsedTrack->originalDate);
         if (!track->getOriginalDate().isValid() && _parsedTrack->originalYear)
@@ -719,7 +743,7 @@ namespace lms::scanner
         track.modify()->setCopyrightURL(_parsedTrack->copyrightURL);
         track.modify()->setAdvisory(getAdvisory(_parsedTrack->advisory));
         track.modify()->setComment(!_parsedTrack->comments.empty() ? _parsedTrack->comments.front() : ""); // only take the first one for now
-        track.modify()->setTrackReplayGain(_parsedTrack->replayGain);
+        track.modify()->setReplayGain(_parsedTrack->replayGain);
         track.modify()->setArtistDisplayName(_parsedTrack->artistDisplayName);
 
         track.modify()->clearEmbeddedLyrics();

src/libs/services/scanner/impl/steps/ScanStepAssociateTrackImages.cpp

@@ -106,15 +106,13 @@ namespace lms::scanner
                 return res;
 
             // fallback on another track of the same disc
-            const db::ReleaseId releaseId{ track->getReleaseId() };
-            if (!releaseId.isValid())
+            const db::MediumId mediumId{ track->getMediumId() };
+            if (!mediumId.isValid())
                 return res;
 
-            if (const auto discNumber{ track->getDiscNumber() })
             {
                 db::TrackEmbeddedImage::FindParameters params;
-                params.setRelease(releaseId);
-                params.setDiscNumber(discNumber);
+                params.setMedium(track->getMediumId());
                 params.setImageType(db::ImageType::Media);
                 params.setSortMethod(db::TrackEmbeddedImageSortMethod::TrackNumberThenSizeDesc);
 

src/libs/subsonic/impl/responses/Album.cpp

@@ -27,6 +27,7 @@
 #include "database/objects/Artwork.hpp"
 #include "database/objects/Cluster.hpp"
 #include "database/objects/Directory.hpp"
+#include "database/objects/Medium.hpp"
 #include "database/objects/Release.hpp"
 #include "database/objects/Track.hpp"
 #include "database/objects/User.hpp"
@@ -207,10 +208,12 @@ namespace lms::api::subsonic
             albumNode.addArrayValue("releaseTypes", releaseType);
 
         albumNode.createEmptyArrayChild("discTitles");
-        for (const DiscInfo& discInfo : release->getDiscs())
+        for (const auto& medium : release->getMediums())
         {
-            if (!discInfo.name.empty())
-                albumNode.addArrayChild("discTitles", createDiscTitle(discInfo));
+            if (medium->getName().empty())
+                continue;
+
+            albumNode.addArrayChild("discTitles", createDiscTitle(medium));
         }
 
         albumNode.createEmptyArrayChild("recordLabels");

src/libs/subsonic/impl/responses/DiscTitle.cpp

@@ -19,14 +19,16 @@
 
 #include "responses/DiscTitle.hpp"
 
+#include "database/objects/Medium.hpp"
+
 namespace lms::api::subsonic
 {
-    Response::Node createDiscTitle(const db::DiscInfo& discInfo)
+    Response::Node createDiscTitle(const db::ObjectPtr<db::Medium>& medium)
     {
         Response::Node discTitleNode;
 
-        discTitleNode.setAttribute("disc", discInfo.position);
-        discTitleNode.setAttribute("title", discInfo.name);
+        discTitleNode.setAttribute("disc", medium->getPosition() ? *medium->getPosition() : 0);
+        discTitleNode.setAttribute("title", medium->getName());
 
         return discTitleNode;
     }

src/libs/subsonic/impl/responses/DiscTitle.hpp

@@ -19,11 +19,16 @@
 
 #pragma once
 
-#include "database/Types.hpp"
+#include "database/Object.hpp"
 
 #include "SubsonicResponse.hpp"
 
+namespace lms::db
+{
+    class Medium;
+}
+
 namespace lms::api::subsonic
 {
-    Response::Node createDiscTitle(const db::DiscInfo& discInfo);
+    Response::Node createDiscTitle(const db::ObjectPtr<db::Medium>& medium);
 }

src/libs/subsonic/impl/responses/ReplayGain.cpp

@@ -19,19 +19,23 @@
 
 #include "responses/ReplayGain.hpp"
 
+#include "database/objects/Medium.hpp"
 #include "database/objects/Track.hpp"
 
 namespace lms::api::subsonic
 {
-    Response::Node createReplayGainNode(const db::ObjectPtr<db::Track>& track)
+    Response::Node createReplayGainNode(const db::Track::pointer& track, const db::Medium::pointer& medium)
     {
         Response::Node replayGainNode;
 
-        if (const auto trackReplayGain{ track->getTrackReplayGain() })
+        if (const auto trackReplayGain{ track->getReplayGain() })
             replayGainNode.setAttribute("trackGain", *trackReplayGain);
 
-        if (const auto releaseReplayGain{ track->getReleaseReplayGain() })
-            replayGainNode.setAttribute("albumGain", *releaseReplayGain);
+        if (medium)
+        {
+            if (const auto releaseReplayGain{ medium->getReplayGain() })
+                replayGainNode.setAttribute("albumGain", *releaseReplayGain);
+        }
 
         return replayGainNode;
     }

src/libs/subsonic/impl/responses/ReplayGain.hpp

@@ -25,10 +25,11 @@
 
 namespace lms::db
 {
+    class Medium;
     class Track;
-}
+} // namespace lms::db
 
 namespace lms::api::subsonic
 {
-    Response::Node createReplayGainNode(const db::ObjectPtr<db::Track>& track);
+    Response::Node createReplayGainNode(const db::ObjectPtr<db::Track>& track, const db::ObjectPtr<db::Medium>& medium);
 }

src/libs/subsonic/impl/responses/Song.cpp

@@ -33,6 +33,7 @@
 #include "database/objects/Cluster.hpp"
 #include "database/objects/Directory.hpp"
 #include "database/objects/MediaLibrary.hpp"
+#include "database/objects/Medium.hpp"
 #include "database/objects/Release.hpp"
 #include "database/objects/Track.hpp"
 #include "database/objects/TrackArtistLink.hpp"
@@ -78,6 +79,8 @@ namespace lms::api::subsonic
     {
         LMS_SCOPED_TRACE_DETAILED("Subsonic", "CreateSong");
 
+        const auto medium{ track->getMedium() };
+
         Response::Node trackResponse;
 
         if (!id3)
@@ -91,8 +94,8 @@ namespace lms::api::subsonic
         trackResponse.setAttribute("title", track->getName());
         if (track->getTrackNumber())
             trackResponse.setAttribute("track", *track->getTrackNumber());
-        if (track->getDiscNumber())
-            trackResponse.setAttribute("discNumber", *track->getDiscNumber());
+        if (medium && medium->getPosition())
+            trackResponse.setAttribute("discNumber", *medium->getPosition());
         if (const auto originalYear{ track->getOriginalYear() })
             trackResponse.setAttribute("year", *originalYear);
         else if (const auto year{ track->getYear() })
@@ -254,7 +257,7 @@ namespace lms::api::subsonic
         };
         trackResponse.setAttribute("explicitStatus", advisoryToExplicitStatus(track->getAdvisory()));
 
-        trackResponse.addChild("replayGain", createReplayGainNode(track));
+        trackResponse.addChild("replayGain", createReplayGainNode(track, medium));
 
         return trackResponse;
     }

src/lms/ui/PlayQueue.cpp

@@ -34,6 +34,7 @@
 #include "core/Service.hpp"
 #include "database/Session.hpp"
 #include "database/objects/Artist.hpp"
+#include "database/objects/Medium.hpp"
 #include "database/objects/Release.hpp"
 #include "database/objects/Track.hpp"
 #include "database/objects/TrackList.hpp"
@@ -621,14 +622,20 @@ namespace lms::ui
             return std::nullopt;
 
         case MediaPlayer::Settings::ReplayGain::Mode::Track:
-            gain = track->getTrackReplayGain();
+            gain = track->getReplayGain();
             break;
 
         case MediaPlayer::Settings::ReplayGain::Mode::Release:
-            gain = track->getReleaseReplayGain();
-            if (!gain)
-                gain = track->getTrackReplayGain();
-            break;
+            {
+                const auto medium{ track->getMedium() };
+                if (medium && medium->getReplayGain())
+                    gain = medium->getReplayGain();
+
+                if (!gain)
+                    gain = track->getReplayGain();
+
+                break;
+            }
 
         case MediaPlayer::Settings::ReplayGain::Mode::Auto:
             {
@@ -641,13 +648,15 @@ namespace lms::ui
                 if ((prevTrack && prevTrack->getRelease() && prevTrack->getRelease() == track->getRelease())
                     || (nextTrack && nextTrack->getRelease() && nextTrack->getRelease() == track->getRelease()))
                 {
-                    gain = track->getReleaseReplayGain();
+                    const auto medium{ track->getMedium() };
+                    if (medium && medium->getReplayGain())
+                        gain = medium->getReplayGain();
                     if (!gain)
-                        gain = track->getTrackReplayGain();
+                        gain = track->getReplayGain();
                 }
                 else
                 {
-                    gain = track->getTrackReplayGain();
+                    gain = track->getReplayGain();
                 }
                 break;
             }

src/lms/ui/explore/PlayQueueController.cpp

@@ -61,14 +61,13 @@ namespace lms::ui
 
         std::vector<db::TrackId> getReleasesTracks(db::Session& session, const std::vector<db::ReleaseId>& releasesId, const Filters& filters, std::size_t maxTrackCount)
         {
-            using namespace db;
             assert(maxTrackCount);
 
-            std::vector<TrackId> res;
+            std::vector<db::TrackId> res;
 
             auto transaction{ session.createReadTransaction() };
 
-            for (const ReleaseId releaseId : releasesId)
+            for (const db::ReleaseId releaseId : releasesId)
             {
                 db::Track::FindParameters params;
                 params.setRelease(releaseId);
@@ -88,34 +87,23 @@ namespace lms::ui
             return res;
         }
 
-        std::vector<db::TrackId> getDiscTracks(db::Session& session, const std::vector<PlayQueueController::Disc>& discs, const Filters& filters, std::size_t maxTrackCount)
+        std::vector<db::TrackId> getMediumTracks(db::Session& session, db::MediumId medium, const Filters& filters, std::size_t maxTrackCount)
         {
-            using namespace db;
             assert(maxTrackCount);
 
-            std::vector<TrackId> res;
+            std::vector<db::TrackId> res;
 
             auto transaction{ session.createReadTransaction() };
 
-            for (const PlayQueueController::Disc& disc : discs)
-            {
-                db::Track::FindParameters params;
-                params.setRelease(disc.releaseId);
-                params.setSortMethod(db::TrackSortMethod::Release);
-                params.setDiscNumber(disc.discNumber);
-                params.setFilters(filters.getDbFilters());
-                params.setRange(db::Range{ 0, maxTrackCount - res.size() });
+            db::Track::FindParameters params;
+            params.setMedium(medium);
+            params.setSortMethod(db::TrackSortMethod::TrackNumber);
+            params.setFilters(filters.getDbFilters());
+            params.setRange(db::Range{ .offset = 0, .size = maxTrackCount });
 
-                const auto tracks{ db::Track::findIds(session, params) };
+            const auto tracks{ db::Track::findIds(session, params) };
 
-                res.reserve(res.size() + tracks.results.size());
-                res.insert(std::end(res), std::cbegin(tracks.results), std::cend(tracks.results));
-
-                if (res.size() == maxTrackCount)
-                    break;
-            }
-
-            return res;
+            return tracks.results;
         }
 
         std::vector<db::TrackId> getTrackListTracks(db::Session& session, db::TrackListId trackListId, const Filters& filters, std::size_t maxTrackCount)
@@ -179,9 +167,9 @@ namespace lms::ui
         processCommand(command, tracks);
     }
 
-    void PlayQueueController::processCommand(Command command, const std::vector<Disc>& discs)
+    void PlayQueueController::processCommand(Command command, db::MediumId medium)
     {
-        const std::vector<db::TrackId> tracks{ getDiscTracks(LmsApp->getDbSession(), discs, _filters, _maxTrackCountToEnqueue) };
+        const std::vector<db::TrackId> tracks{ getMediumTracks(LmsApp->getDbSession(), medium, _filters, _maxTrackCountToEnqueue) };
         processCommand(command, tracks);
     }
 

src/lms/ui/explore/PlayQueueController.hpp

@@ -22,6 +22,7 @@
 #include <vector>
 
 #include "database/objects/ArtistId.hpp"
+#include "database/objects/MediumId.hpp"
 #include "database/objects/ReleaseId.hpp"
 #include "database/objects/TrackId.hpp"
 #include "database/objects/TrackListId.hpp"
@@ -49,12 +50,7 @@ namespace lms::ui
         void processCommand(Command command, const std::vector<db::ReleaseId>& releases);
         void processCommand(Command command, const std::vector<db::TrackId>& tracks);
 
-        struct Disc
-        {
-            db::ReleaseId releaseId;
-            size_t discNumber;
-        };
-        void processCommand(Command command, const std::vector<Disc>& discs);
+        void processCommand(Command command, db::MediumId medium);
         void processCommand(Command command, db::TrackListId trackList);
         void playTrackInRelease(db::TrackId track);
 

src/lms/ui/explore/ReleaseView.cpp

@@ -19,6 +19,7 @@
 
 #include "ReleaseView.hpp"
 
+#include <Wt/WContainerWidget.h>
 #include <map>
 
 #include <Wt/WAnchor.h>
@@ -32,6 +33,7 @@
 #include "database/Types.hpp"
 #include "database/objects/Artist.hpp"
 #include "database/objects/Cluster.hpp"
+#include "database/objects/Medium.hpp"
 #include "database/objects/Release.hpp"
 #include "database/objects/ScanSettings.hpp"
 #include "database/objects/Track.hpp"
@@ -233,6 +235,11 @@ namespace lms::ui
             return res;
         }
 
+        std::unique_ptr<Wt::WTemplate> createNoDiscContainer()
+        {
+            return std::make_unique<Wt::WTemplate>(Wt::WString::tr("Lms.Explore.Release.template.entry-nodisc"));
+        }
+
     } // namespace
 
     Release::Release(Filters& filters, PlayQueueController& playQueueController)
@@ -275,9 +282,10 @@ namespace lms::ui
 
         auto similarReleasesIds{ core::Service<recommendation::IRecommendationService>::get()->getSimilarReleases(*releaseId, 5) };
 
-        auto transaction{ LmsApp->getDbSession().createReadTransaction() };
+        auto& session{ LmsApp->getDbSession() };
+        auto transaction{ session.createReadTransaction() };
 
-        const db::Release::pointer release{ db::Release::find(LmsApp->getDbSession(), *releaseId) };
+        const db::Release::pointer release{ db::Release::find(session, *releaseId) };
         if (!release)
             throw ReleaseNotFoundException{};
 
@@ -310,7 +318,7 @@ namespace lms::ui
 
         Wt::WContainerWidget* clusterContainers{ bindNew<Wt::WContainerWidget>("clusters") };
         {
-            const auto clusterTypeIds{ ClusterType::findIds(LmsApp->getDbSession()).results };
+            const auto clusterTypeIds{ ClusterType::findIds(session).results };
             const auto clusterGroups{ release->getClusterGroups(clusterTypeIds, 3) };
 
             for (const auto& clusters : clusterGroups)
@@ -377,113 +385,86 @@ namespace lms::ui
             });
         }
 
-        Wt::WContainerWidget* rootContainer{ bindNew<Wt::WContainerWidget>("container") };
+        refreshDiscs(release);
+    }
 
-        bool displayTrackArtists{ shouldDisplayTrackArtists(*releaseId) };
-        const auto totalDisc{ release->getTotalDisc() };
-        const std::size_t discCount{ release->getDiscCount() };
-        const bool hasDiscSubtitle{ release->hasDiscSubtitle() };
-        const bool useSubtitleContainers{ (discCount > 1) || (totalDisc && *totalDisc > 1) || hasDiscSubtitle };
+    void Release::refreshArtwork(db::ArtworkId artworkId)
+    {
+        std::unique_ptr<Wt::WImage> artworkImage;
+        if (artworkId.isValid())
+        {
+            artworkImage = utils::createArtworkImage(artworkId, ArtworkResource::DefaultArtworkType::Release, ArtworkResource::Size::Large);
+            artworkImage->addStyleClass("Lms-cursor-pointer"); // HACK
+        }
+        else
+            artworkImage = utils::createDefaultArtworkImage(ArtworkResource::DefaultArtworkType::Release);
 
-        // Expect to be called in asc order
-        std::map<std::size_t, Wt::WContainerWidget*> trackContainers;
-        auto getOrAddDiscContainer = [&, releaseId = _releaseId](std::size_t discNumber, const std::string& discSubtitle, db::ArtworkId mediaArtworkId) -> Wt::WContainerWidget* {
-            if (auto it{ trackContainers.find(discNumber) }; it != std::cend(trackContainers))
-                return it->second;
-
-            Template* disc{ rootContainer->addNew<Template>(Wt::WString::tr("Lms.Explore.Release.template.entry-disc")) };
-            disc->addFunction("id", &Wt::WTemplate::Functions::id);
-
-            if (mediaArtworkId.isValid())
-            {
-                auto image{ utils::createArtworkImage(mediaArtworkId, ArtworkResource::DefaultArtworkType::Release, ArtworkResource::Size::Small) };
-
-                disc->setCondition("if-has-artwork", true);
-
-                image->addStyleClass("Lms-cover-track rounded"); // HACK
-                image->clicked().connect([=] {
-                    utils::showArtworkModal(Wt::WLink{ LmsApp->getArtworkResource()->getArtworkUrl(mediaArtworkId, ArtworkResource::DefaultArtworkType::Release) });
-                });
-                disc->bindWidget<Wt::WImage>("artwork", std::move(image));
-            }
-
-            if (discSubtitle.empty())
-                disc->bindNew<Wt::WText>("disc-title", Wt::WString::tr("Lms.Explore.Release.disc").arg(discNumber));
-            else
-                disc->bindString("disc-title", Wt::WString::fromUTF8(discSubtitle), Wt::TextFormat::Plain);
-
-            Wt::WPushButton* playBtn{ disc->bindNew<Wt::WPushButton>("play-btn", Wt::WString::tr("Lms.template.play-btn"), Wt::TextFormat::XHTML) };
-            playBtn->clicked().connect([this, releaseId, discNumber] {
-                _playQueueController.processCommand(PlayQueueController::Command::Play, { PlayQueueController::Disc{ releaseId, discNumber } });
+        auto* image{ bindWidget<Wt::WImage>("artwork", std::move(artworkImage)) };
+        if (artworkId.isValid())
+        {
+            image->clicked().connect([artworkId] {
+                utils::showArtworkModal(Wt::WLink{ LmsApp->getArtworkResource()->getArtworkUrl(artworkId, ArtworkResource::DefaultArtworkType::Release) });
             });
-            disc->bindNew<Wt::WPushButton>("more-btn", Wt::WString::tr("Lms.template.more-btn"), Wt::TextFormat::XHTML);
-            disc->bindNew<Wt::WPushButton>("play", Wt::WString::tr("Lms.Explore.play"))
-                ->clicked()
-                .connect([this, releaseId, discNumber] {
-                    _playQueueController.processCommand(PlayQueueController::Command::Play, { PlayQueueController::Disc{ releaseId, discNumber } });
-                });
-            disc->bindNew<Wt::WPushButton>("play-next", Wt::WString::tr("Lms.Explore.play-next"))
-                ->clicked()
-                .connect([this, releaseId, discNumber] {
-                    _playQueueController.processCommand(PlayQueueController::Command::PlayNext, { PlayQueueController::Disc{ releaseId, discNumber } });
-                });
+        }
+    }
 
-            disc->bindNew<Wt::WPushButton>("play-shuffled", Wt::WString::tr("Lms.Explore.play-shuffled"), Wt::TextFormat::Plain)
-                ->clicked()
-                .connect([this, releaseId, discNumber] {
-                    _playQueueController.processCommand(PlayQueueController::Command::PlayShuffled, { PlayQueueController::Disc{ releaseId, discNumber } });
-                });
-            disc->bindNew<Wt::WPushButton>("play-last", Wt::WString::tr("Lms.Explore.play-last"))
-                ->clicked()
-                .connect([this, releaseId, discNumber] {
-                    _playQueueController.processCommand(PlayQueueController::Command::PlayOrAddLast, { PlayQueueController::Disc{ releaseId, discNumber } });
-                });
+    void Release::refreshReleaseArtists(const db::Release::pointer& release)
+    {
+        auto container{ utils::createArtistsAnchorsForRelease(release) };
+        if (container)
+        {
+            setCondition("if-has-release-artists", true);
+            bindWidget("artists", std::move(container));
+        }
+    }
+
+    void Release::refreshDiscs(const db::Release::pointer& release)
+    {
+        Wt::WContainerWidget* discsContainer{ bindNew<Wt::WContainerWidget>("disc-container") };
+        const std::vector<db::Medium::pointer> mediums{ release->getMediums() };
+        if (mediums.empty())
+            return;
+
+        const bool displayTrackArtists{ shouldDisplayTrackArtists(_releaseId) };
+        const auto totalDisc{ release->getTotalDisc() };
+
+        const bool createDiscs{ mediums.size() > 1
+                                || !mediums[0]->getName().empty()
+                                || totalDisc > 1 };
+
+        for (const db::Medium::pointer& medium : mediums)
+        {
+            Wt::WTemplate* disc{ discsContainer->addWidget<Wt::WTemplate>(createDiscs ? createDisc(medium) : createNoDiscContainer()) };
 
             Wt::WContainerWidget* tracksContainer{ disc->bindNew<Wt::WContainerWidget>("tracks") };
-            trackContainers[discNumber] = tracksContainer;
-
-            return tracksContainer;
-        };
-
-        Wt::WContainerWidget* noDiscTracksContainer{};
-        auto getOrAddNoDiscContainer = [&] {
-            if (noDiscTracksContainer)
-                return noDiscTracksContainer;
-
-            Wt::WTemplate* disc{ rootContainer->addNew<Wt::WTemplate>(Wt::WString::tr("Lms.Explore.Release.template.entry-nodisc")) };
-            noDiscTracksContainer = disc->bindNew<Wt::WContainerWidget>("tracks");
-
-            return noDiscTracksContainer;
-        };
+            createTracks(tracksContainer, medium, displayTrackArtists);
+        }
+    }
 
+    void Release::createTracks(Wt::WContainerWidget* tracksContainer, const db::Medium::pointer& medium, bool displayTrackArtists)
+    {
         db::Track::FindParameters params;
-        params.setRelease(_releaseId);
-        params.setSortMethod(db::TrackSortMethod::Release);
+        params.setMedium(medium->getId());
+        params.setSortMethod(db::TrackSortMethod::TrackNumber);
         params.setFilters(_filters.getDbFilters()); // TODO: do we really want to hide all tracks when a release does not match the current label filter?
 
         db::Track::find(LmsApp->getDbSession(), params, [&](const db::Track::pointer& track) {
             const db::TrackId trackId{ track->getId() };
-            const auto discNumber{ track->getDiscNumber() };
 
-            Wt::WContainerWidget* container{};
-            if (useSubtitleContainers && discNumber)
-                container = getOrAddDiscContainer(*discNumber, track->getDiscSubtitle(), track->getPreferredMediaArtworkId());
-            else if (hasDiscSubtitle && !discNumber)
-                container = getOrAddDiscContainer(0, track->getDiscSubtitle(), track->getPreferredMediaArtworkId());
-            else
-                container = getOrAddNoDiscContainer();
-
-            Template* entry{ container->addNew<Template>(Wt::WString::tr("Lms.Explore.Release.template.entry")) };
+            Template* entry{ tracksContainer->addNew<Template>(Wt::WString::tr("Lms.Explore.Release.template.entry")) };
             entry->addFunction("id", &Wt::WTemplate::Functions::id);
 
             entry->bindString("name", Wt::WString::fromUTF8(track->getName()), Wt::TextFormat::Plain);
 
-            const auto artists{ track->getArtistIds({ TrackArtistLinkType::Artist }) };
-            if (displayTrackArtists && !artists.empty())
+            if (displayTrackArtists)
             {
-                entry->setCondition("if-has-artists", true);
-                entry->bindWidget("artists", utils::createArtistDisplayNameWithAnchors(track->getArtistDisplayName(), artists));
-                entry->bindWidget("artists-md", utils::createArtistDisplayNameWithAnchors(track->getArtistDisplayName(), artists));
+                const auto artists{ track->getArtistIds({ TrackArtistLinkType::Artist }) };
+                if (!artists.empty())
+                {
+                    entry->setCondition("if-has-artists", true);
+                    entry->bindWidget("artists", utils::createArtistDisplayNameWithAnchors(track->getArtistDisplayName(), artists));
+                    entry->bindWidget("artists-md", utils::createArtistDisplayNameWithAnchors(track->getArtistDisplayName(), artists));
+                }
             }
 
             fillTrackArtistLinks(entry, track->getId());
@@ -565,36 +546,6 @@ namespace lms::ui
         });
     }
 
-    void Release::refreshArtwork(db::ArtworkId artworkId)
-    {
-        std::unique_ptr<Wt::WImage> artworkImage;
-        if (artworkId.isValid())
-        {
-            artworkImage = utils::createArtworkImage(artworkId, ArtworkResource::DefaultArtworkType::Release, ArtworkResource::Size::Large);
-            artworkImage->addStyleClass("Lms-cursor-pointer"); // HACK
-        }
-        else
-            artworkImage = utils::createDefaultArtworkImage(ArtworkResource::DefaultArtworkType::Release);
-
-        auto* image{ bindWidget<Wt::WImage>("artwork", std::move(artworkImage)) };
-        if (artworkId.isValid())
-        {
-            image->clicked().connect([artworkId] {
-                utils::showArtworkModal(Wt::WLink{ LmsApp->getArtworkResource()->getArtworkUrl(artworkId, ArtworkResource::DefaultArtworkType::Release) });
-            });
-        }
-    }
-
-    void Release::refreshReleaseArtists(const db::Release::pointer& release)
-    {
-        auto container{ utils::createArtistsAnchorsForRelease(release) };
-        if (container)
-        {
-            setCondition("if-has-release-artists", true);
-            bindWidget("artists", std::move(container));
-        }
-    }
-
     void Release::refreshCopyright(const db::Release::pointer& release)
     {
         std::optional<std::string> copyright{ release->getCopyright() };
@@ -680,4 +631,59 @@ namespace lms::ui
         }
     }
 
+    std::unique_ptr<Wt::WTemplate> Release::createDisc(const db::Medium::pointer& medium)
+
+    {
+        const db::MediumId mediumId{ medium->getId() };
+
+        std::unique_ptr<Wt::WTemplate> disc{ std::make_unique<Template>(Wt::WString::tr("Lms.Explore.Release.template.entry-disc")) };
+        disc->addFunction("id", &Wt::WTemplate::Functions::id);
+
+        if (db::ArtworkId artworkId{ medium->getPreferredArtworkId() }; artworkId.isValid())
+        {
+            auto image{ utils::createArtworkImage(artworkId, ArtworkResource::DefaultArtworkType::Release, ArtworkResource::Size::Small) };
+
+            disc->setCondition("if-has-artwork", true);
+
+            image->addStyleClass("Lms-cover-track rounded"); // HACK
+            image->clicked().connect([artworkId] {
+                utils::showArtworkModal(Wt::WLink{ LmsApp->getArtworkResource()->getArtworkUrl(artworkId, ArtworkResource::DefaultArtworkType::Release) });
+            });
+            disc->bindWidget<Wt::WImage>("artwork", std::move(image));
+        }
+
+        if (medium->getName().empty())
+            disc->bindNew<Wt::WText>("disc-title", Wt::WString::tr("Lms.Explore.Release.disc").arg(medium->getPosition() ? *medium->getPosition() : 1 /* TODO */));
+        else
+            disc->bindString("disc-title", Wt::WString::fromUTF8(std::string{ medium->getName() }), Wt::TextFormat::Plain);
+
+        Wt::WPushButton* playBtn{ disc->bindNew<Wt::WPushButton>("play-btn", Wt::WString::tr("Lms.template.play-btn"), Wt::TextFormat::XHTML) };
+        playBtn->clicked().connect([this, mediumId] {
+            _playQueueController.processCommand(PlayQueueController::Command::Play, mediumId);
+        });
+        disc->bindNew<Wt::WPushButton>("more-btn", Wt::WString::tr("Lms.template.more-btn"), Wt::TextFormat::XHTML);
+        disc->bindNew<Wt::WPushButton>("play", Wt::WString::tr("Lms.Explore.play"))
+            ->clicked()
+            .connect([this, mediumId] {
+                _playQueueController.processCommand(PlayQueueController::Command::Play, mediumId);
+            });
+        disc->bindNew<Wt::WPushButton>("play-next", Wt::WString::tr("Lms.Explore.play-next"))
+            ->clicked()
+            .connect([this, mediumId] {
+                _playQueueController.processCommand(PlayQueueController::Command::PlayNext, mediumId);
+            });
+
+        disc->bindNew<Wt::WPushButton>("play-shuffled", Wt::WString::tr("Lms.Explore.play-shuffled"), Wt::TextFormat::Plain)
+            ->clicked()
+            .connect([this, mediumId] {
+                _playQueueController.processCommand(PlayQueueController::Command::PlayShuffled, mediumId);
+            });
+        disc->bindNew<Wt::WPushButton>("play-last", Wt::WString::tr("Lms.Explore.play-last"))
+            ->clicked()
+            .connect([this, mediumId] {
+                _playQueueController.processCommand(PlayQueueController::Command::PlayOrAddLast, mediumId);
+            });
+
+        return disc;
+    }
 } // namespace lms::ui

src/lms/ui/explore/ReleaseView.hpp

@@ -27,8 +27,9 @@
 
 namespace lms::db
 {
+    class Medium;
     class Release;
-}
+} // namespace lms::db
 
 namespace lms::ui
 {
@@ -44,11 +45,15 @@ namespace lms::ui
         void refreshView();
         void refreshArtwork(db::ArtworkId artworkId);
         void refreshReleaseArtists(const db::ObjectPtr<db::Release>& release);
+        void refreshDiscs(const db::ObjectPtr<db::Release>& release);
+        void createTracks(Wt::WContainerWidget* tracksContainer, const db::ObjectPtr<db::Medium>& medium, bool displayTrackArtists);
         void refreshCopyright(const db::ObjectPtr<db::Release>& release);
         void refreshLinks(const db::ObjectPtr<db::Release>& release);
         void refreshOtherVersions(const db::ObjectPtr<db::Release>& release);
         void refreshSimilarReleases(const std::vector<db::ReleaseId>& similarReleaseIds);
 
+        std::unique_ptr<Wt::WTemplate> createDisc(const db::ObjectPtr<db::Medium>& medium);
+
         Filters& _filters;
         PlayQueueController& _playQueueController;
         db::ReleaseId _releaseId;

src/lms/ui/resource/DownloadResource.cpp

@@ -25,6 +25,7 @@
 #include "core/ILogger.hpp"
 #include "database/Session.hpp"
 #include "database/objects/Artist.hpp"
+#include "database/objects/Medium.hpp"
 #include "database/objects/Release.hpp"
 #include "database/objects/Track.hpp"
 #include "database/objects/TrackList.hpp"
@@ -116,12 +117,13 @@ namespace lms::ui
 
     namespace details
     {
-        std::string getTrackPathName(db::Track::pointer track)
+        std::string getTrackPathName(const db::Track::pointer& track)
         {
             std::ostringstream fileName;
 
-            if (auto discNumber{ track->getDiscNumber() })
-                fileName << *discNumber << ".";
+            const db::Medium::pointer medium{ track->getMedium() };
+            if (medium && medium->getPosition())
+                fileName << *medium->getPosition() << ".";
             if (auto trackNumber{ track->getTrackNumber() })
                 fileName << std::setw(2) << std::setfill('0') << *trackNumber << " - ";
 

src/tools/db-generator/LmsDbGenerator.cpp

@@ -37,6 +37,7 @@
 #include "database/objects/Artist.hpp"
 #include "database/objects/Cluster.hpp"
 #include "database/objects/MediaLibrary.hpp"
+#include "database/objects/Medium.hpp"
 #include "database/objects/Release.hpp"
 #include "database/objects/Track.hpp"
 #include "database/objects/TrackArtistLink.hpp"
@@ -90,6 +91,8 @@ namespace lms
         const core::UUID releaseMBID{ core::UUID::generate() };
         const std::string releaseName{ "Release-" + std::string{ core::UUID::generate().getAsString() } };
         Release::pointer release{ context.session.create<Release>(releaseName, releaseMBID) };
+        Medium::pointer medium{ context.session.create<Medium>(release) };
+        medium.modify()->setTrackCount(params.trackCountPerRelease);
 
         Artist::pointer artist{ generateArtist(context.session) };
 
@@ -106,13 +109,12 @@ namespace lms
             Track::pointer track{ context.session.create<Track>() };
 
             track.modify()->setName("Track-" + std::string{ core::UUID::generate().getAsString() });
-            track.modify()->setDiscNumber(1);
+            track.modify()->setMedium(medium);
             track.modify()->setTrackNumber(i);
             track.modify()->setDuration(std::chrono::seconds{ core::random::getRandom(30, 300) });
             track.modify()->setRelease(release);
             track.modify()->setTrackMBID(core::UUID::generate());
             track.modify()->setRecordingMBID(core::UUID::generate());
-            track.modify()->setTotalTrack(params.trackCountPerRelease);
             if (mediaLibrary)
                 track.modify()->setMediaLibrary(mediaLibrary);