WMIDI

Midi encoding and decoding library.

Usage

use std::convert::TryFrom;

// Decoding messages from bytes.
fn handle_midi_message(bytes: &[u8]) -> Result<(), wmidi::FromBytesError> {
    let message = wmidi::MidiMessage::try_from(bytes)?;
    if let wmidi::MidiMessage::NoteOn(_, note, val) = message {
        let volume = u8::from(val) as u8 / 127.0;
        println!("Singing {} at volume {}", note, volume);
    }
    Ok(())
}

// Encoding messages to bytes.
fn midi_to_bytes(message: wmidi::MidiMessage<'_>) -> Vec<u8> {
    let mut bytes = vec![0u8; message.bytes_size()];
    message.copy_to_slice(bytes.as_mut_slice()).unwrap();
    bytes
}

Features

• Supports no_std environments.
• No memory allocations (therefore realtime safe) for parsing and encoding.
• No memory allocations for creating MidiMessage, except for MidiMessage::OwnedSysEx.

Testing & Benchmarking

• Build with cargo build.
• Test with cargo test.
• Benchmark with cargo bench. The results will be under ./target/criterion/report/index.html.

Changelog

Unreleased

• Use error from core.
• Added MidiMessage::set_channel() method.

4.0.0

• New ControlFunction type which simply wraps a U7.
• Constants and documentation for all ControlFunction values.
• Renumber Note enums/consts to be more consistent with midi; for example, C0 is now C1.

3.1.0

• Rename MidiMessage::wire_size() to MidiMessage::bytes_size().
• Introduce MidiMessage::copy_to_slice() method.

3.0.0

• Instances of U7 and U14 now have bounds checking.
• Note is now an enum instead of a u8. Can be converted with Note::try_from and u8::from.