Go-MeltySynth is a SoundFont synthesizer written in Go, ported from MeltySynth for C#.
- Suitable for both real-time and offline synthesis.
- Support for standard MIDI files.
- No dependencies other than the standard library.
https://www.youtube.com/watch?v=HLta6pASIFg
go get github.com/sinshu/go-meltysynth
An example code to synthesize a simple chord:
// Load the SoundFont.
sf2, _ := os.Open("TimGM6mb.sf2")
soundFont, _ := meltysynth.NewSoundFont(sf2)
sf2.Close()
// Create the synthesizer.
settings := meltysynth.NewSynthesizerSettings(44100)
synthesizer, _ := meltysynth.NewSynthesizer(soundFont, settings)
// Play some notes (middle C, E, G).
synthesizer.NoteOn(0, 60, 100)
synthesizer.NoteOn(0, 64, 100)
synthesizer.NoteOn(0, 67, 100)
// The output buffer (3 seconds).
length := 3 * settings.SampleRate
left := make([]float32, length)
right := make([]float32, length)
// Render the waveform.
synthesizer.Render(left, right)Another example code to synthesize a MIDI file:
// Load the SoundFont.
sf2, _ := os.Open("TimGM6mb.sf2")
soundFont, _ := meltysynth.NewSoundFont(sf2)
sf2.Close()
// Create the synthesizer.
settings := meltysynth.NewSynthesizerSettings(44100)
synthesizer, _ := meltysynth.NewSynthesizer(soundFont, settings)
// Load the MIDI file.
mid, _ := os.Open("C:\\Windows\\Media\\flourish.mid")
midiFile, _ := meltysynth.NewMidiFile(mid)
mid.Close()
// Create the MIDI sequencer.
sequencer := meltysynth.NewMidiFileSequencer(synthesizer)
sequencer.Play(midiFile, true)
// The output buffer.
length := int(float64(settings.SampleRate) * float64(midiFile.GetLength()) / float64(time.Second))
left := make([]float32, length)
right := make([]float32, length)
// Render the waveform.
sequencer.Render(left, right)- Wave synthesis
- SoundFont reader
- Waveform generator
- Envelope generator
- Low-pass filter
- Vibrato LFO
- Modulation LFO
- MIDI message processing
- Note on/off
- Bank selection
- Modulation
- Volume control
- Pan
- Expression
- Hold pedal
- Program change
- Pitch bend
- Tuning
- Effects
- Reverb
- Chorus
- Other things
- Standard MIDI file support
- Performace optimization
Go-MeltySynth is available under the MIT license.