https://github.com/googlesamples/android-audio-high-performance/tree/master/SimpleSynth
this a simple synth which generate a sin tone. just replace the implementation of int Synthesizer::render with a call to fluid_synth_write. This project use cmake to build the android native libraries, but you should be able to use the libfluidsynth.so built with the headers in the /include folder. I'll add the CMakeFiles.txt in my fork for easier integration... eventually. Philippe On Thu, Jan 18, 2018 at 12:44 PM, Phil Blandford <philip.blandf...@gmail.com > wrote: > OK, thanks - it's certainly easier to build, but I'm really not clear > where I should be calling fluid_synth_write_* - in a driver I've written > myself? Are there any examples I can follow? > > > On 18 January 2018 at 09:14, Philippe Simons <simons.phili...@gmail.com> > wrote: > >> The issue I have with an audio driver on Android, is that it will never >> cover all the uses cases that a dev might need. >> >> For ex: >> OpenSL is great for real-time MIDI rendering because it allows to work >> with very small buffers. (15ms) >> But for a MIDI player, working with small buffer is not a option (if the >> devices goes to sleep, it wont be able to catchup with the required speed >> to fill the buffer) and you need to work with buffers in the 500ms range or >> more with and AudioTrack object. >> OpenSL is also old tech on Android, while not deprecated, it's >> recommended to use AAudio starting with Android 8.0 >> >> So my idea was to left that to the dev, it's really no big deal to call >> the fluid_synth_write_*() function to pull the audio, it also allows you >> to modify it before rendering (mixing, filtering, effects,...) >> >> Being free from the glib dep, my fork is also very light (+/- 250kb for >> each CPU arch), and almost up-to-date with https://github.com/FluidS >> ynth/fluidsynth >> >> Now it's up to you to use whatever solution fits your needs. >> Just my two cents. >> >> Philippe >> >> On Thu, Jan 18, 2018 at 5:29 AM, Phil Blandford < >> philip.blandf...@gmail.com> wrote: >> >>> >>> Ok, further progress, once I sorted out my own dumb JNI bugs.. >>> >>> I can load a soundfont, play a MIDI file, but it rarely gets to the end >>> - it stops, and won't start again until I restart the test app. The logcat >>> is full of: >>> >>> [ 01-17 22:50:13.890 2651: 2717 D/ ] >>> PlayerBase::stop() from >>> IPlayer >>> >>> once every millisecond (give or take), regardless of whether a file is >>> playing or not. >>> >>> I'm slowly getting up to speed on both fluidsynth architecture and the >>> Android audio subsystem, but it may be someone who knows more about either >>> or both could make better progress. >>> >>> The git log on the fluid_opensles.c file seems to indicate it hasn't >>> been touched in 2 years. But it does seem tantalisingly close, just a few >>> fixes away from being a real boon to Android developers who want to use >>> soundfonts in their apps and have a more flexible MIDI than the native >>> Mediaplayer gives them. >>> >>> >>> >>> >>> > Hi, this is also my first post to the fluidsynth list, so apologies in >>> advance for any inadvertent breaches of etiquette! >>> >>> > I've been struggling to build that same fork for a few days, and did >>> manage it in the end. The problems came down to: >>> >>> <snip> >>> >>> > Anyway, I've managed to create a basic JNI wrapper and got it working >>> in an app - sort of. I can load a soundfont, play a note with >>> fluid_synth_note_on/off, but the sound is rather distorted. I can tell it >>> to play a file - the logcat shows something is happening, but no sound is >>> produced. I'm a bit stuck now as I don't know enough about low-level audio >>> to debug. >>> >>> > I'd really like to hear if anyone has got this up and running. >>> >>> >>> _______________________________________________ >>> fluid-dev mailing list >>> fluid-dev@nongnu.org >>> https://lists.nongnu.org/mailman/listinfo/fluid-dev >>> >>> >> >> _______________________________________________ >> fluid-dev mailing list >> fluid-dev@nongnu.org >> https://lists.nongnu.org/mailman/listinfo/fluid-dev >> >> > > > _______________________________________________ > fluid-dev mailing list > fluid-dev@nongnu.org > https://lists.nongnu.org/mailman/listinfo/fluid-dev > >
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