Subsonic API: extensions WIP

README.md

@@ -18,7 +18,7 @@ A [demo instance](http://lms-demo.poupon.dev) is available. Note the administrat
   * Synchronizing 'love' feedbacks
 * ReplayGain support
 * User management, with several [authentication backends](INSTALL.md#authentication-backend)
-* Subsonic API
+* [Subsonic API](http://www.subsonic.org/pages/api.jsp) / [OpenSubsonic API](https://opensubsonic.netlify.app/docs/opensubsonic-api/)
 
 ## Music discovery
 _LMS_ provides several ways to help you find the music you like:
@@ -35,11 +35,7 @@ _LMS_ provides several ways to help you find the music you like:
   * ...
 
 ## Subsonic API
-The API version implemented is 1.16.0 and has been tested on _Android_ using _Subsonic Player_, _Ultrasonic_, _Symfonium_, and _DSub_.
+See [Subsonic API](SUBSONIC.md) dedicated page.
-Since _LMS_ uses metadata tags to organize music, a compatibility mode is used to browse the collection when using the directory browsing commands.
-The Subsonic API is enabled by default.
-
-__Note__: since _LMS_ may store hashed and salted passwords or may forward authentication requests to external services, it cannot handle the __token authentication__ method. You may need to check your client to make sure to use the __password__ authentication method.
 
 ## About tags
 _LMS_ relies exclusively on tags to organize your music collection.

SUBSONIC.md

@@ -0,0 +1,32 @@
+# Subsonic API
+The API version implemented is 1.16.0 and has been tested on _Android_ using _Subsonic Player_, _Ultrasonic_, _Symfonium_, and _DSub_.
+Since _LMS_ uses metadata tags to organize music, a compatibility mode is used to browse the collection when using the directory browsing commands.
+The Subsonic API is enabled by default.
+
+__Note__: since _LMS_ may store hashed and salted passwords or may forward authentication requests to external services, it cannot handle the __token authentication__ method. You may need to check your client to make sure to use the __password__ authentication method.
+
+## OpenSubsonic API
+The following extra fields are implemented:
+* `Album` response:
+  * `musicBrainzId`
+  * `genres`
+  * `artists`
+  * `releaseTypes`
+  * `moods`
+  * `originalReleaseDate`
+  * `isCompilation`
+  * `discTitles`
+* `Child` response:
+  * `musicBrainzId`: note this is actually the recording MBID
+  * `genres`
+  * `artists`
+  * `albumArtists`
+  * `contributors`
+  * `moods`
+  * `replayGain`
+* `Artist` response:
+  * `musicBrainzId`
+  * `sortName`
+  * `roles`
+
+The timeOffset parameter