#Fluidsynth midi synthesizer drivers
#Fluidsynth midi synthesizer for android
#Fluidsynth midi synthesizer android
#Fluidsynth midi synthesizer software

Therefore I came up with two implementations one for MidiDeviceService and another for my API.

#Fluidsynth midi synthesizer android

My managed-midi API is cross-platform, inspired by Web MIDI API, and it makes more sense to rather implement Android backend for it. The entire API is super weird regarding inputs and outputs directions, but is not very difficult to implement.Дuring this attempts, I found that supporting Android MIDI API is almost no benefits. To build such a service, we have to implement. I only had to care about Android-specific extensions built only for Android.ДЄt last, I created an Android MIDI device service on top of this NFluidsynth.Android. And making it as a Xamarin.Android library is almost at zero cost. Therefore I made binding for fluidsynth API using P/Invoke, released as. Fluidsynth itself works as a virtual MIDI synthesizer, but to bridge from the systemвЂ™s MIDI service entrypoints, we have to make fluidsynth functions callable and map from those entrypoints. NFluidsynth and FluidsynthMidiServiceДЇluidsynth is cross-platform and works fine on Linux, which makes it easier for me to develop C# binding. Since my application is written in C#, I added those extensions to my P/Invoke wrappers (thatвЂ™s only what I had to do - if I were using Java, IвЂ™d also have to add JNI entrypoints tooвЂ¦). So I had to extend fluidsynth itself to accept custom SF loader - the abstraction API and Android assets-based implementation. Fluidsynth only offered filename-based loader which simply used local file I/O. One another thing I had to implement was to support custom stream loader for SoundFont files. Even samples from an NDK book published in Japanese were almost the same as these samples. A minor problem was that there was almost only one reference sample by Victor Lazzarini ( his blog used to be publicly visible but now itвЂ™s privateвЂ¦). The source structure was nice enough and I could easily add fluid_opensles.c to the tree. Second, I had to add opensles implementation.

#Fluidsynth midi synthesizer for android

I had to make some changes to support custom Android NDK setup, so my cerbero tree ended up to become an incompatible fork with the original tree, but I could build libfluidsynth.so for Android in the end.Д®verything ended up to become this repo: Android/OpenSLES implementation And it was quite easy to add fluidsynth to the catalog. cerberoвЂ™s ultimate purpose would be to build GStreamer, but it can be anything if a recipe is added to the tree. It builds everything, including glib, in autotools manner, for Android as well as other targets.ДЄll those dependency libraries can be built with вЂњrecipeвЂќ, which customize each library build. How is it built? вЂ¦ thatвЂ™s how I found Cerbero build system. Next, how about GStreamer? It is known to support Android. There is Gimp, right? вЂ¦ but it runs on top of some weird X server. There are handful of glib-dependent apps and libraries that are known to work on Android. glib is autotools-based and NDK did not play with it nicely. It would be particularly because of glib dependency there is no intuitive way to build it for Android. The original fluidsynth does not support Android builds.

#Fluidsynth midi synthesizer drivers

Fluidsynth has its audio abstraction layer in their drivers source directory, so the only thing I had to do would be just to add another one there, right?ДЇirst, fluidsynth needed to be built with Android NDK toolchains. For Android, AudioTrack and OpenSL ES are the available choices (when I was implementing it there was no AAudio nor Oboe).

#Fluidsynth midi synthesizer software

Fluidsynth is a software synthesizer that supports various audio APIs but not for Android. It was not simple first of all, it does not make sense if there is no sound output. It was designed to make it capable to run a software MIDI synthesizer through the service, so why not porting any of the existing bits? I thought so, and ended up to bring Fluidsynth into Android land. A technically-looking-cool feature is that it supports virtual MIDI device services so that anyone can implement a MIDI device service that can provide either MIDI input devices or MIDI output devices (or both) that other apps can connect as clients and play them just like other operating systems (Windows, Mac, Linux, iOSвЂ¦). Since Android 6.0, it supports its own MIDI API as well as MIDI connection over BLE, so it became possible to connect MIDI devices to Android (if you would like to read my Japanese article, itвЂ™s part of the book вЂњAndroid Masters!вЂќ). One of my unknown projects is Fluidsynth for Android.