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https://github.com/sinshu/go-meltysynth
A SoundFont MIDI synthesizer written in pure Golang
https://github.com/sinshu/go-meltysynth
audio go golang meltysynth midi soundfont synthesizer
Last synced: 17 days ago
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A SoundFont MIDI synthesizer written in pure Golang
- Host: GitHub
- URL: https://github.com/sinshu/go-meltysynth
- Owner: sinshu
- License: other
- Created: 2022-08-08T14:20:42.000Z (over 2 years ago)
- Default Branch: main
- Last Pushed: 2023-04-07T13:07:14.000Z (over 1 year ago)
- Last Synced: 2024-10-15T02:44:04.262Z (about 1 month ago)
- Topics: audio, go, golang, meltysynth, midi, soundfont, synthesizer
- Language: Go
- Homepage:
- Size: 597 KB
- Stars: 62
- Watchers: 5
- Forks: 11
- Open Issues: 3
-
Metadata Files:
- Readme: README.md
- License: LICENSE.txt
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README
# Go-MeltySynth
Go-MeltySynth is a SoundFont synthesizer written in Go, ported from [MeltySynth for C#](https://github.com/sinshu/meltysynth).
## Features
* Suitable for both real-time and offline synthesis.
* Support for standard MIDI files.
* No dependencies other than the standard library.
## Demo
https://www.youtube.com/watch?v=HLta6pASIFg
[](https://www.youtube.com/watch?v=HLta6pASIFg)
## Installation
```
go get github.com/sinshu/go-meltysynth
```
## Examples
An example code to synthesize a simple chord:
```go
// 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:
```go
// 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)
```
## Todo
* __Wave synthesis__
- [x] SoundFont reader
- [x] Waveform generator
- [x] Envelope generator
- [x] Low-pass filter
- [x] Vibrato LFO
- [x] Modulation LFO
* __MIDI message processing__
- [x] Note on/off
- [x] Bank selection
- [x] Modulation
- [x] Volume control
- [x] Pan
- [x] Expression
- [x] Hold pedal
- [x] Program change
- [x] Pitch bend
- [x] Tuning
* __Effects__
- [x] Reverb
- [x] Chorus
* __Other things__
- [x] Standard MIDI file support
- [x] Performace optimization
## License
Go-MeltySynth is available under [the MIT license](LICENSE.txt).