xsynth-core 0.4.0

A fast Rust-based SoundFont synthesizer designed for high voice counts and low latency.
Documentation 
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use std::{iter, ops::Deref, sync::Arc};

use crate::{
    helpers::are_arc_vecs_equal,
    soundfont::SoundfontBase,
    voice::{Voice, VoiceControlData},
};

use super::voice_spawner::VoiceSpawnerMatrix;

#[derive(Default, PartialEq, Eq, Clone, Copy, Debug)]
pub struct ProgramDescriptor {
    pub bank: u8,
    pub preset: u8,
}

pub struct ChannelSoundfont {
    soundfonts: Vec<Arc<dyn SoundfontBase>>,
    matrix: VoiceSpawnerMatrix,
    curr_program: ProgramDescriptor,
}

impl Deref for ChannelSoundfont {
    type Target = VoiceSpawnerMatrix;

    #[inline(always)]
    fn deref(&self) -> &Self::Target {
        &self.matrix
    }
}

impl ChannelSoundfont {
    pub fn new() -> Self {
        ChannelSoundfont {
            soundfonts: Vec::new(),
            matrix: VoiceSpawnerMatrix::new(),
            curr_program: Default::default(),
        }
    }

    pub fn set_soundfonts(&mut self, soundfonts: Vec<Arc<dyn SoundfontBase>>) {
        if !are_arc_vecs_equal(&self.soundfonts, &soundfonts) {
            self.soundfonts = soundfonts;
            self.rebuild_matrix();
        }
    }

    pub fn change_program(&mut self, program: ProgramDescriptor) {
        if self.curr_program != program {
            self.curr_program = program;
            self.rebuild_matrix();
        }
    }

    fn rebuild_matrix(&mut self) {
        // If a preset/instr. is missing from all banks it will be muted,
        // if a preset/instr. has regions in bank 0, all missing banks will be replaced by 0,
        // if a preset/instr. has regions in any bank other than 0, all missing banks will be muted.
        // For drum patches the same applies with bank and preset switched.

        let bank = self.curr_program.bank;
        let preset = self.curr_program.preset;

        for k in 0..128u8 {
            for v in 0..128u8 {
                let find_replacement_attack = || {
                    if bank == 128 {
                        self.soundfonts
                            .iter()
                            .map(|sf| sf.get_attack_voice_spawners_at(bank, 0, k, v))
                            .find(|vec| !vec.is_empty())
                    } else {
                        self.soundfonts
                            .iter()
                            .map(|sf| sf.get_attack_voice_spawners_at(0, preset, k, v))
                            .find(|vec| !vec.is_empty())
                    }
                };

                let attack_spawners = self
                    .soundfonts
                    .iter()
                    .map(|sf| sf.get_attack_voice_spawners_at(bank, preset, k, v))
                    .chain(iter::once_with(find_replacement_attack).flatten())
                    .find(|vec| !vec.is_empty())
                    .unwrap_or_default();

                let find_replacement_release = || {
                    if bank == 128 {
                        self.soundfonts
                            .iter()
                            .map(|sf| sf.get_release_voice_spawners_at(bank, 0, k, v))
                            .find(|vec| !vec.is_empty())
                    } else {
                        self.soundfonts
                            .iter()
                            .map(|sf| sf.get_release_voice_spawners_at(0, preset, k, v))
                            .find(|vec| !vec.is_empty())
                    }
                };

                let release_spawners = self
                    .soundfonts
                    .iter()
                    .map(|sf| sf.get_release_voice_spawners_at(bank, preset, k, v))
                    .chain(iter::once_with(find_replacement_release).flatten())
                    .find(|vec| !vec.is_empty())
                    .unwrap_or_default();

                self.matrix.set_spawners_attack(k, v, attack_spawners);
                self.matrix.set_spawners_release(k, v, release_spawners);
            }
        }
    }

    pub fn spawn_voices_attack<'a>(
        &'a self,
        control: &'a VoiceControlData,
        key: u8,
        vel: u8,
    ) -> impl Iterator<Item = Box<dyn Voice>> + 'a {
        self.matrix.spawn_voices_attack(control, key, vel)
    }

    pub fn spawn_voices_release<'a>(
        &'a self,
        control: &'a VoiceControlData,
        key: u8,
        vel: u8,
    ) -> impl Iterator<Item = Box<dyn Voice>> + 'a {
        self.matrix.spawn_voices_release(control, key, vel)
    }

    pub fn exclusive_classes_attack<'a>(
        &'a self,
        key: u8,
        vel: u8,
    ) -> impl Iterator<Item = u8> + 'a {
        self.matrix.exclusive_classes_attack(key, vel)
    }
}