Struct RpnTracker 

pub struct RpnTracker { /* private fields */ }

Tracks RPN/NRPN state across all 16 MIDI channels.

This struct is designed for real-time safety:

• Fixed-size array (no heap allocation)
• All operations are O(1)
• Implements Copy for simple value semantics

Usage

Plugins that need to receive RPN/NRPN messages should store an instance of this tracker in their state and call process_cc for each incoming Control Change event.

struct MyPlugin {
    rpn_tracker: RpnTracker,
}

impl Processor for MyPlugin {
    fn process_midi(&mut self, input: &[MidiEvent], output: &mut MidiBuffer) {
        for event in input {
            if let MidiEventKind::ControlChange(cc) = &event.event {
                if let Some(msg) = self.rpn_tracker.process_cc(cc) {
                    // Handle complete RPN/NRPN message
                    if msg.is_pitch_bend_sensitivity() {
                        let (semitones, cents) = msg.pitch_bend_sensitivity();
                        self.pitch_bend_range = semitones as f32 + cents as f32 / 100.0;
                    }
                }
            }
        }
    }
}

Implementations

impl RpnTracker

pub const fn new() -> Self

Create a new RPN tracker with all channels in their default state.

pub fn reset(&mut self)

Reset all channel states.

pub fn reset_channel(&mut self, channel: MidiChannel)

Reset a specific channel’s state.

pub fn process_cc( &mut self, cc: &ControlChange, ) -> Option<ParameterNumberMessage>

Process a Control Change event.

Returns Some(ParameterNumberMessage) when a complete RPN/NRPN message has been assembled from the CC sequence.

Arguments

• cc - The Control Change event to process

Returns

• None for non-RPN/NRPN CCs or incomplete sequences
• Some(message) when a complete RPN/NRPN is ready

pub fn current_parameter( &self, channel: MidiChannel, ) -> Option<(ParameterNumberKind, u16)>

Get the currently selected parameter for a channel, if any.

Trait Implementations

impl Clone for RpnTracker

fn clone(&self) -> RpnTracker

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for RpnTracker

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for RpnTracker

fn default() -> Self

Returns the “default value” for a type.

impl Copy for RpnTracker