https://github.com/rawbits2010/libbitdauer

Just a wave generator for my music projects
https://github.com/rawbits2010/libbitdauer

Last synced: 12 months ago
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Just a wave generator for my music projects

• Host: GitHub
• URL: https://github.com/rawbits2010/libbitdauer
• Owner: rawbits2010
• License: mit
• Created: 2024-03-11T00:23:05.000Z (over 2 years ago)
• Default Branch: main
• Last Pushed: 2025-01-18T02:29:02.000Z (over 1 year ago)
• Last Synced: 2025-01-20T06:44:33.081Z (over 1 year ago)
• Language: Go
• Size: 47.9 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# LibBitDauer v0.1

A simple software synthesizer package for my audio projects. Also includes some basic sound analysis tools for no reason.

#### Limitations:

- It has some limited support for continuous generation, but currently it is only used to generate into a fixed size buffer.

- The envelope is also supposed to fully support the MIDI key-trigger mechanics, but it's never been used.

## Features

- Oscillator

  - Wave functions:

    - Sine, square, triangle, sawtooth, reverse sawtooth

	- Noise:

	  - White (using built-in Go rand.Rand)

	  - Red, pink, blue, violet (by applying filters to the white noise)

- Modulators:

  - Envelope (ADSR with various shapes):

    - LERP

    - Ease-in, ease-out, ease-in-out

	- Exponential, logarithmic, inverse exponential, inverse logarithmic

	- S-Curve (sigmoid)

  - LFO (can use all wave functions above)

- Filters:

  - Single, chain, chain of chain

  - Low-pass, high-pass, band-pass, notch, peaking

- Musical scale LUT generator based on a base note frequency

- Output options:

  - Export to WAV or raw (unsigned 32 bit integer) format

  - Play as 1 channel 44.1kHz using the [oto package](https://github.com/ebitengine/oto)

## Examples

Some examples are provided in the cmd folder, both for the synth and the analysis tools.

### Genex

The synth example creates an oscillator that outputs an A4 note with a customized envelope into a 2-second-long buffer. The generated sound will be played with the default sound device and saved as a WAV file.

### Idex

Loads a WAV file and extracts the dominant frequencies to identify the waveform. It also saves the extracted data into a CSV, and generates various diagrams into PNGs. An example untuned identification is performed using the harmonic ratios and another with other metrics (bandwidth, spectral centroid).

## TODOs

A rough list of planned features:

- Mixer to have multiple oscillators

- PWM generator

- Filter support to the oscillator

- Free form modulator (multiple envelope sections with selectable easing functions)

- Other filters like expander, compressor, limiter

- Handle overdrive

## License

This project is licensed under the MIT License. See the [LICENSE](LICENSE) file for details.