taroodr / fluidsynth2

Fluidsynth2 bindings for Go

Fluidsynth2 bindings for Go

This package allows you to interface with FluidSynth 2 using Go. FluidSynth is great for playing back MIDI, both realtime through the audio output or to a file for offline consumption. There is just something magical about hearing a terrible MIDI cover of Neil Young playing back through a bad soundfont that prompted me to work on these bindings.

It's based on the repo by sqweek with updates for FluidSynth2 and a lot more that allows you to actually use most of the functionality in FluidSynth.

Installation

1. Get the bindings:

$ go get -u github.com/coral/fluidsynth2

2. Import it in your code:

import "github.com/coral/fluidsynth2"

Simple Example

This example will play a MIDI file from disk. You need a MIDI file and a Soundfont in order for audio to play.

s := fluidsynth2.NewSettings()
synth := fluidsynth2.NewSynth(s)
synth.SFLoad("soundfont.sf2", false)

player := fluidsynth2.NewPlayer(synth)
player.Add("song.mid")

fluidsynth2.NewAudioDriver(s, synth)

player.Play()
player.Join()

Configuring FluidSynth

Most of the methods needed to configure FluidSynth are exposed. Here is an example of how you can query FluidSynth for avaliable audio drivers.

s := fluidsynth2.NewSettings()

audioDrivers := s.GetOptions("audio.driver")

for _, driver := range audioDrivers {
	fmt.Print(driver + " ")
}

//Perform logic here to decide what driver to use.
//In this case we are going to use coreaudio

s.SetString("audio.driver", "coreaudio")

Playing MIDI from a buffer

Sometimes you want to load files through Go rather than FluidSynth, the bindings provide a simple way to play back byte slices of MIDI.

s := fluidsynth2.NewSettings()

synth := fluidsynth2.NewSynth(s)
synth.SFLoad("files/soundfont.sf2", false)

dat, err := ioutil.ReadFile("midifile.mid")
if err != nil {
	panic(err)
}

player.AddMem(dat)

fluidsynth2.NewAudioDriver(s, synth)

player.Play()
player.Join()

Contributing

m8 just open a PR with some gucchimucchi code and I'll review it.