Tempo – An open source music client for Subsonic built natively for Android, with Android Auto support and synchronized lyrics and it's available on F-Droid
An open source and lightweight music client for Subsonic, designed and built natively for Android. - CappielloAntonio/tempo
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Hello community, today I want to present to you the work done on Tempo in recent months. This new version brings improvements to Android Auto, a first use of the OpenSubsonic API, synchronized song lyrics and the ability to customize the home screen.
As usual, Tempo is free and open source, by the community and for the community. You can follow the development on Github and you can download it from F-Droid as well.
If you appreciate the work put into Tempo, remember that you can star the project on Github or make a donation! It’s not much but it’s useful to help the project grow and give visibility to the app.
The OpenSubsonic project aims to extend and improve the classic Subsonic APIs in various ways: by adding new endpoints, clarifying existing APIs, or extending functionality. All while maintaining backward compatibility with the old APIs.
Understanding whether the server supports the API, requesting the list of supported extensions and acting accordingly is the first step to integrating the OpenSubsonic API.
Initial work was done with synchronized lyrics using an endpoint that does not exist in the classic version of the API but was introduced by OpenSubsonic.
As far as I known, subsonic is currently closed source and other reimplemented the api with open source programs. Than some people got together to make a standard that was not tied to a closed source programs.
I actually looked went down that rabbit hole a little, thanks for the link. Seems most of the commits thus far are from the Navidrome developer and the Symfonium developer.
I found this and this which seems to flesh out what it is pretty well.
The tl;dr is they added some flexibility to the API because since subsonic went closed source everybody's been working off the original specs which doesn't account for all the extra bells and whistles that have been added in the past seven years.