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This commit is contained in:
Raphaël Forment
2026-02-03 02:53:34 +01:00
parent b305df3d79
commit 5c805c60d7
5 changed files with 146 additions and 126 deletions
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33
src/engine/timing.rs
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@@ -1,25 +1,14 @@
/// Microsecond-precision timestamp for audio synchronization.
pub type SyncTime = u64;
/// Sentinel value representing "never" or "no scheduled time".
pub const NEVER: SyncTime = SyncTime::MAX;
/// Convert beat duration to microseconds at given tempo.
pub fn beats_to_micros(beats: f64, tempo: f64) -> SyncTime {
fn beats_to_micros(beats: f64, tempo: f64) -> SyncTime {
if tempo <= 0.0 {
return 0;
}
((beats / tempo) * 60_000_000.0).round() as SyncTime
}
/// Convert microseconds to beats at given tempo.
pub fn micros_to_beats(micros: SyncTime, tempo: f64) -> f64 {
if tempo <= 0.0 {
return 0.0;
}
(tempo * (micros as f64)) / 60_000_000.0
}
/// Timing boundary types for step and pattern scheduling.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum StepTiming {
@@ -67,9 +56,6 @@ pub fn substeps_crossed(prev_beat: f64, curr_beat: f64, speed: f64) -> usize {
(curr_substep - prev_substep).clamp(0, 16) as usize
}
/// Threshold for switching from sleep to active wait (100μs).
pub const ACTIVE_WAIT_THRESHOLD_US: SyncTime = 100;
/// Calculate microseconds until the next substep boundary.
pub fn micros_until_next_substep(current_beat: f64, speed: f64, tempo: f64) -> SyncTime {
if tempo <= 0.0 || speed <= 0.0 {
@@ -94,26 +80,9 @@ mod tests {
assert_eq!(beats_to_micros(0.5, 120.0), 250_000);
}
#[test]
fn test_micros_to_beats_at_120_bpm() {
// At 120 BPM, 500,000 microseconds = 1 beat
assert!((micros_to_beats(500_000, 120.0) - 1.0).abs() < 1e-10);
assert!((micros_to_beats(1_000_000, 120.0) - 2.0).abs() < 1e-10);
}
#[test]
fn test_zero_tempo() {
assert_eq!(beats_to_micros(1.0, 0.0), 0);
assert_eq!(micros_to_beats(1_000_000, 0.0), 0.0);
}
#[test]
fn test_roundtrip() {
let tempo = 135.0;
let beats = 3.75;
let micros = beats_to_micros(beats, tempo);
let back = micros_to_beats(micros, tempo);
assert!((back - beats).abs() < 1e-6);
}
#[test]