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This is a sample project which strives to use fluidsynth as a native android library with OpenSL ES support
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.gitignore Include fluidsynth-android Mar 13, 2018


This is a sample project which strives to use fluidsynth as a native android library with OpenSL ES support

The original fluidsynth repository can be found here: FluidSynth/fluidsynth

Adjustments, or better yet additions, to build fluidsynth for the Android platform where made by VolcanoMobile in this repository: VolcanoMobile/fluidsynth-android

I set up a fresh Android project via AndroidStudio, simply copied over all relevant files from VolcanoMobile/fluidsynth-android and referenced the android/CMakeLists.txt within the app's build.gradle. That works in the sense that it compiles and fluidsynth can be used within the app (i.e. JNI). But in order to be able to build fluidsynth for Android VolcanoMobile exluded all Audio-Driver classes, thus removing the ability to actually hear any MIDI events.

To enable audio with fluidsynth on Android with the OpenSL ES audio framework atsushieno made independent changes to fluidsynth in his own fluidsynth fork. I was not able to build that project. But, since I was able to build VolcanoMobiles version of fluidsynth I thought it might be possible to only include atsushienos changes into VolcanoMobiles version. This project tries to do exactly that.

NOTE: I know that this project currently scrambles fluidsynth library code with sample app code. I wanted to extract the fluidsynth part into it's own gradle-module library inside this project and have another module (i.e. the android sample app) with it's own native code use that library. But I couldn't get it to work. The native code inside the sample app then couldn't find the headers provided by the fluidsynth library. Any ideas are welcome.


  • Include VolcanoMobiles version of fluidsynth
  • Include atsushienos additions to fluidsynth to enable OpenSL ES support. His changes can be found in this patch
  • Be able to build the project again. Update: It now builds with changes taken from here and here.
  • Extract the fluidsynth part into its own gradle-module and have a sample app reference it
  • Fix W/libOpenSLES: Leaving BufferQueue::Enqueue (SL_RESULT_BUFFER_INSUFFICIENT). After a while the output stumbles and logcat is filled with this log statement.


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