Restructure project: 1 file = 1 responsibility, max 4 files/folder, 250 lines/file

src/dsp/preset/mod.rs

@@ -0,0 +1,131 @@
+//! Preset voice settings: pitch, formant, effect chain and gate.
+//! Built at startup from built-ins plus custom presets from the config file.
+
+pub mod build;
+pub mod table_a;
+pub mod table_b;
+
+pub use build::build_effects;
+
+use serde::{Deserialize, Serialize};
+use std::sync::OnceLock;
+
+pub struct Preset {
+    pub name: String,
+    /// Pitch shift in semitones (positive = higher).
+    pub pitch_semitones: f32,
+    /// Formant ratio (1.0 = unchanged, >1 = higher/brighter).
+    pub formant_ratio: f32,
+    /// Effects applied in order after pitch/formant.
+    pub effects: Vec<EffectSpec>,
+    /// Output makeup gain so every preset sounds equally loud.
+    pub gain: f32,
+    /// Noise gate threshold for this preset (-100 = off).
+    pub gate_db: f32,
+}
+
+#[derive(Clone, Copy, Debug, Serialize, Deserialize)]
+pub enum EffectSpec {
+    Distortion {
+        drive: f32,
+        output: f32,
+    },
+    Overdrive {
+        drive: f32,
+        output: f32,
+    },
+    Bitcrush {
+        bits: u8,
+        sample_rate_div: u32,
+        max_gain: f32,
+        target: f32,
+    },
+    Reverb {
+        room: f32,
+        damp: f32,
+        wet: f32,
+    },
+    Chorus {
+        depth_ms: f32,
+        rate_hz: f32,
+        wet: f32,
+    },
+    Flanger {
+        depth_ms: f32,
+        rate_hz: f32,
+        feedback: f32,
+        wet: f32,
+    },
+    Tremolo {
+        depth: f32,
+        rate_hz: f32,
+    },
+    RingMod {
+        freq_hz: f32,
+        depth: f32,
+    },
+    Bandpass {
+        low_hz: f32,
+        high_hz: f32,
+        mix: f32,
+    },
+    Noise {
+        gain: f32,
+    },
+    Compressor {
+        threshold_db: f32,
+        ratio: f32,
+        makeup_db: f32,
+    },
+    Vocoder {
+        bands: usize,
+        carrier: crate::dsp::fx::CarrierKind,
+        carrier_hz: f32,
+        wet: f32,
+    },
+}
+
+/// User-defined preset from the config file.
+#[derive(Deserialize)]
+pub struct CustomPresetCfg {
+    pub pitch: Option<f32>,
+    pub formant: Option<f32>,
+    pub effects: Option<Vec<EffectSpec>>,
+    pub gate_db: Option<f32>,
+}
+
+static PRESETS: OnceLock<Vec<Preset>> = OnceLock::new();
+
+fn builtin_presets() -> Vec<Preset> {
+    let mut all = table_a::table_a();
+    all.extend(table_b::table_b());
+    all
+}
+
+/// Register custom presets (from the config file). Call once at startup.
+pub fn init_custom(customs: Vec<Preset>) {
+    let _ = PRESETS.get_or_init(|| {
+        let mut all = builtin_presets();
+        all.extend(customs);
+        all
+    });
+}
+
+/// The full preset list (built-ins + customs).
+pub fn presets() -> &'static [Preset] {
+    init_custom(Vec::new());
+    PRESETS.get_or_init(builtin_presets)
+}
+
+impl Preset {
+    pub fn find(name: &str) -> Option<usize> {
+        presets().iter().position(|p| {
+            p.name.eq_ignore_ascii_case(name)
+                || p.name
+                    .split('/')
+                    .next()
+                    .map(|s| s.trim().eq_ignore_ascii_case(name))
+                    .unwrap_or(false)
+        })
+    }
+}