How to use the BASS audio library in UWP development

The BASS audio library is a solid library to decode and play many audio formats, supports gapless playback (using the mixer, not used in this example) and equalizer (not used in this example).

The library is available also for Windows Store development.

To reference the BASS audio library in your UWP project remember to add conditional references based on platform in the csproj file

Let’s see how we can use the library in a background audio player.

First we need the background task. Here we initialize the BASS audio library, and free it when the task ends. Since we are going to use BASS only to decode the audio we can use the “no sound” device.

Now we need to play the file when the foreground app asks for it. Communication between the foreground app and the background task is made through messages.

When the background task receives a “file” request message it opens the file using BASS (we’ll see later how) and sets the media source of the bacgkround media player.

The BassMediaSource class implements IMediaSource and is the one responsible of opening and playing the file.

The code is quite simple: we need to create the decode stream for the BASS audio library and listen to the MediaSource events (Closed, Starting, SampleRequested).

The SampleRequested event occurs when then audio player needs a decoded sample to play. Here we just need to decode the requested data and return it to the player.

The application lets you select a file from your music library (files outside of your music library won’t work because the application does not have access to external folders).

Here’s the full source code of the test program (remember to set your BASS registration info)

Download source code

Have fun! 😉

8 thoughts on “How to use the BASS audio library in UWP development

    • I tested it right now on my machine (update to version 1709) and the example works.
      I played 30 seconds of a track (encoded in mp3).
      What problem do you have?

      • I made another test and the application stops working if you set the target version to “Fall creator update”.
        It seems Microsoft broke the legacy background media playback (it is marked as “obsolete” but it is actually not working).
        I tried to use the single process model and this way the app works fine. I sent the updated example to your email address. 😉

  1. hello there!, i’m trying to build this demo app, i get error message

    CS0006 Could not find metadata ‘C:\Users\usuario\Documents\Visual Studio 2017\Projects\BassUWPTest\BackgroundPlayer\bin\ARM\Debug\BackgroundPlayer.winmd’ BassUWPTest C:\Users\usuario\Documents\Visual Studio 2017\Projects\BassUWPTest\BassUWPTest\CSC

      • The record code is just standard bass stuff. RecordStart etc. A wavewriter isn’t needed to test. If your getting data to the RECRROC it should be good to go. Fall Creators Update broke the playing of a silent wav to fool the sys that a file was playing…so you could record.

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