pitchy

Minimalistic Rust library for working with musical notes, frequencies (Hz), MIDI numbers, and pitch operations like transposition and octave shifts.

✨ Features

• Parse note names like "A4", "C#3", "Db5"
• Convert to MIDI note number and frequency in Hz
• Transpose notes by semitones or octaves
• Lightweight and no_std compatible (via feature flag)

🚀 Usage

Add to your Cargo.toml:

[dependencies]
pitchy = "0.1"

Or, to use in no_std mode:

[dependencies.pitchy]
version = "0.1"
default-features = false

🔧 Example Usage

Parse and Analyze a Note

use pitchy::Note;
use core::str::FromStr;

let note = Note::from_str("A4").unwrap();
assert_eq!(note.midi_number(), Some(69));
assert_eq!(note.frequency(), 440.0);

Transpose a Note

let note = Note::from_str("C4").unwrap();
let up = note.transpose(4.0);
assert_eq!(up.midi_number(), Some(64)); // E4

Convert from MIDI Number

let note = Note::try_from_midi_number(60).unwrap();
assert_eq!(note.frequency(), 261.625565); // ≈ C4

Get Note Parts (no_std friendly)

let note = Note::from_str("F#3").unwrap();
let (semitone, octave) = note.note_parts().unwrap();
assert_eq!(semitone, 6); // F#
assert_eq!(octave, 3);

⚙️ Optional Features

• std (enabled by default): enables note name formatting and Display impls
• libm: enables the libm math backend used in no_std mode

To build without std, use:

cargo build --no-default-features --features libm

📄 License

MIT © paramako