Feat: fix sequencer precision regression

Cargo.lock

@@ -1825,7 +1825,7 @@ dependencies = [
 [[package]]
 name = "doux"
 version = "0.0.15"
-source = "git+https://github.com/sova-org/doux?tag=v0.0.15#1f11f795b877d9c15f65d88eb5576e8149092b17"
+source = "git+https://github.com/sova-org/doux?tag=v0.0.15#29d8f055612f6141d7546d72b91e60026937b0fd"
 dependencies = [
  "arc-swap",
  "clap",

plugins/cagire-plugins/src/lib.rs

@@ -292,7 +292,7 @@ impl Plugin for CagirePlugin {
             fill: false,
             nudge_secs: 0.0,
             current_time_us: 0,
-            audio_sample_pos: self.sample_pos,
+            corrected_audio_pos: self.sample_pos as f64,
             sr: self.sample_rate as f64,
             mouse_x: 0.5,
             mouse_y: 0.5,

src/bin/desktop/main.rs

@@ -1,15 +1,16 @@
 #![windows_subsystem = "windows"]
 
-use std::sync::atomic::{AtomicBool, AtomicI64, AtomicU32, AtomicU64, Ordering};
+use std::sync::atomic::{AtomicBool, AtomicI64, AtomicU32, Ordering};
 use std::sync::Arc;
 use std::time::Duration;
 
+use arc_swap::ArcSwap;
 use clap::Parser;
 use doux::EngineMetrics;
 use eframe::NativeOptions;
 
 use cagire::engine::{
-    build_stream, AnalysisHandle, AudioStreamConfig, LinkState, ScopeBuffer,
+    build_stream, AnalysisHandle, AudioRef, AudioStreamConfig, LinkState, ScopeBuffer,
     SequencerHandle, SpectrumBuffer,
 };
 use cagire::terminal::{create_terminal, FontChoice, TerminalType};
@@ -48,7 +49,7 @@ struct CagireDesktop {
     metrics: Arc<EngineMetrics>,
     scope_buffer: Arc<ScopeBuffer>,
     spectrum_buffer: Arc<SpectrumBuffer>,
-    audio_sample_pos: Arc<AtomicU64>,
+    audio_ref: Arc<ArcSwap<AudioRef>>,
     sample_rate_shared: Arc<AtomicU32>,
     _stream: Option<cpal::Stream>,
     _input_stream: Option<cpal::Stream>,
@@ -94,7 +95,7 @@ impl CagireDesktop {
             metrics: b.metrics,
             scope_buffer: b.scope_buffer,
             spectrum_buffer: b.spectrum_buffer,
-            audio_sample_pos: b.audio_sample_pos,
+            audio_ref: b.audio_ref,
             sample_rate_shared: b.sample_rate_shared,
             _stream: b.stream,
             _input_stream: b.input_stream,
@@ -152,7 +153,11 @@ impl CagireDesktop {
             }
         }
 
-        self.audio_sample_pos.store(0, Ordering::Release);
+        self.audio_ref.store(Arc::new(AudioRef {
+            sample_pos: 0,
+            timestamp: std::time::Instant::now(),
+            sample_rate: 44100.0,
+        }));
 
         let preload_entries: Vec<(String, std::path::PathBuf)> = restart_samples
             .iter()
@@ -166,7 +171,7 @@ impl CagireDesktop {
             Arc::clone(&self.spectrum_buffer),
             Arc::clone(&self.metrics),
             restart_samples,
-            Arc::clone(&self.audio_sample_pos),
+            Arc::clone(&self.audio_ref),
             new_error_tx,
             &self.app.audio.config.sample_paths,
             Arc::clone(&self.device_lost),

src/engine/audio.rs

@@ -1,13 +1,22 @@
 //! Audio output stream (cpal) and FFT spectrum analysis.
 
+use arc_swap::ArcSwap;
 use ringbuf::{traits::*, HeapRb};
 use rustfft::{num_complex::Complex, FftPlanner};
 use std::sync::atomic::{AtomicBool, AtomicU32, Ordering};
 use std::sync::Arc;
 use std::thread::{self, JoinHandle};
+use std::time::Instant;
 
-#[cfg(feature = "cli")]
-use std::sync::atomic::AtomicU64;
+/// Timestamped audio position reference for jitter-free tick interpolation.
+/// Published by the audio callback after each `process_block`, read by the
+/// sequencer to compute the correct sample position at any instant.
+#[derive(Clone)]
+pub struct AudioRef {
+    pub sample_pos: u64,
+    pub timestamp: Instant,
+    pub sample_rate: f64,
+}
 
 pub struct ScopeBuffer {
     pub samples: [AtomicU32; 256],
@@ -303,7 +312,7 @@ pub fn build_stream(
     spectrum_buffer: Arc<SpectrumBuffer>,
     metrics: Arc<EngineMetrics>,
     initial_samples: Vec<doux::sampling::SampleEntry>,
-    audio_sample_pos: Arc<AtomicU64>,
+    audio_ref: Arc<ArcSwap<AudioRef>>,
     error_tx: Sender<String>,
     sample_paths: &[std::path::PathBuf],
     device_lost: Arc<AtomicBool>,
@@ -438,6 +447,7 @@ pub fn build_stream(
     let mut rt_set = false;
     let mut live_scratch = vec![0.0f32; 4096];
     let mut input_consumer = input_consumer;
+    let mut current_pos: u64 = 0;
 
     let stream = device
         .build_output_stream(
@@ -454,8 +464,6 @@ pub fn build_stream(
                 let buffer_samples = data.len() / channels;
                 let buffer_time_ns = (buffer_samples as f64 / sr as f64 * 1e9) as u64;
 
-                audio_sample_pos.fetch_add(buffer_samples as u64, Ordering::Release);
-
                 while let Ok(cmd) = audio_rx.try_recv() {
                     match cmd {
                         AudioCommand::Evaluate { cmd, tick } => {
@@ -497,6 +505,16 @@ pub fn build_stream(
 
                 engine.metrics.load.set_buffer_time(buffer_time_ns);
                 engine.process_block(data, &[], &live_scratch[..raw_len]);
+
+                // Publish accurate audio reference AFTER process_block
+                // so sample_pos matches doux's internal tick exactly.
+                current_pos += buffer_samples as u64;
+                audio_ref.store(Arc::new(AudioRef {
+                    sample_pos: current_pos,
+                    timestamp: Instant::now(),
+                    sample_rate: sr as f64,
+                }));
+
                 scope_buffer.write(data);
 
                 // Feed mono mix to analysis thread via ring buffer (non-blocking)

src/engine/mod.rs

@@ -7,7 +7,7 @@ mod timing;
 
 pub use timing::{next_boundary, substeps_in_window, SyncTime};
 
-pub use audio::{preload_sample_heads, AnalysisHandle, ScopeBuffer, SpectrumBuffer};
+pub use audio::{preload_sample_heads, AnalysisHandle, AudioRef, ScopeBuffer, SpectrumBuffer};
 
 // Re-exported for the plugin crate (not used by the terminal binary).
 #[allow(unused_imports)]

src/engine/sequencer.rs

@@ -8,10 +8,12 @@ use rand::SeedableRng;
 use std::collections::HashMap;
 #[cfg(feature = "desktop")]
 use std::sync::atomic::AtomicU32;
-use std::sync::atomic::{AtomicI64, AtomicU64};
+use std::sync::atomic::AtomicI64;
 use std::sync::Arc;
 use std::thread::{self, JoinHandle};
 
+use super::audio::AudioRef;
+
 use super::dispatcher::{dispatcher_loop, MidiDispatch, TimedMidiCommand};
 use super::realtime::set_realtime_priority;
 use super::{next_boundary, substeps_in_window, LinkState, SyncTime};
@@ -329,7 +331,7 @@ impl AudioState {
 }
 
 pub struct SequencerConfig {
-    pub audio_sample_pos: Arc<AtomicU64>,
+    pub audio_ref: Arc<ArcSwap<AudioRef>>,
     pub sample_rate: Arc<std::sync::atomic::AtomicU32>,
     pub cc_access: Option<Arc<dyn CcAccess>>,
     pub variables: Variables,
@@ -393,7 +395,7 @@ pub fn spawn_sequencer(
                 shared_state_clone,
                 live_keys,
                 nudge_us,
-                config.audio_sample_pos,
+                config.audio_ref,
                 config.sample_rate,
                 config.cc_access,
                 variables,
@@ -502,7 +504,7 @@ pub struct TickInput {
     pub fill: bool,
     pub nudge_secs: f64,
     pub current_time_us: SyncTime,
-    pub audio_sample_pos: u64,
+    pub corrected_audio_pos: f64,
     pub sr: f64,
     pub mouse_x: f64,
     pub mouse_y: f64,
@@ -765,7 +767,7 @@ impl SequencerState {
             input.fill,
             input.nudge_secs,
             input.current_time_us,
-            input.audio_sample_pos,
+            input.corrected_audio_pos,
             input.sr,
             input.mouse_x,
             input.mouse_y,
@@ -780,7 +782,7 @@ impl SequencerState {
             input.quantum,
             input.fill,
             input.nudge_secs,
-            input.audio_sample_pos,
+            input.corrected_audio_pos,
             input.sr,
             input.mouse_x,
             input.mouse_y,
@@ -934,7 +936,7 @@ impl SequencerState {
         fill: bool,
         nudge_secs: f64,
         _current_time_us: SyncTime,
-        audio_sample_pos: u64,
+        corrected_audio_pos: f64,
         sr: f64,
         mouse_x: f64,
         mouse_y: f64,
@@ -983,7 +985,7 @@ impl SequencerState {
                 } else {
                     0.0
                 };
-                let event_tick = Some(audio_sample_pos + (time_delta * sr).round() as u64);
+                let event_tick = Some((corrected_audio_pos + time_delta * sr).round() as u64);
 
                 if let Some(step) = pattern.steps.get(step_idx) {
                     let resolved_script = pattern.resolve_script(step_idx);
@@ -1095,7 +1097,7 @@ impl SequencerState {
         quantum: f64,
         fill: bool,
         nudge_secs: f64,
-        audio_sample_pos: u64,
+        corrected_audio_pos: f64,
         sr: f64,
         mouse_x: f64,
         mouse_y: f64,
@@ -1117,7 +1119,7 @@ impl SequencerState {
             } else {
                 0.0
             };
-            let event_tick = Some(audio_sample_pos + (time_delta * sr).round() as u64);
+            let event_tick = Some((corrected_audio_pos + time_delta * sr).round() as u64);
 
             let step_in_cycle = self.script_step % self.script_length;
 
@@ -1263,7 +1265,7 @@ fn sequencer_loop(
     shared_state: Arc<ArcSwap<SharedSequencerState>>,
     live_keys: Arc<LiveKeyState>,
     nudge_us: Arc<AtomicI64>,
-    audio_sample_pos: Arc<AtomicU64>,
+    audio_ref: Arc<ArcSwap<AudioRef>>,
     sample_rate: Arc<std::sync::atomic::AtomicU32>,
     cc_access: Option<Arc<dyn CcAccess>>,
     variables: Variables,
@@ -1330,7 +1332,9 @@ fn sequencer_loop(
         let lookahead_end = beat + lookahead_beats;
 
         let sr = sample_rate.load(Ordering::Relaxed) as f64;
-        let audio_samples = audio_sample_pos.load(Ordering::Acquire);
+        let ref_snapshot = audio_ref.load();
+        let elapsed_secs = ref_snapshot.timestamp.elapsed().as_secs_f64();
+        let corrected_pos = ref_snapshot.sample_pos as f64 + elapsed_secs * ref_snapshot.sample_rate;
         let input = TickInput {
             commands,
             playing: is_playing,
@@ -1341,7 +1345,7 @@ fn sequencer_loop(
             fill: live_keys.fill(),
             nudge_secs: nudge_us.load(Ordering::Relaxed) as f64 / 1_000_000.0,
             current_time_us,
-            audio_sample_pos: audio_samples,
+            corrected_audio_pos: corrected_pos,
             sr,
             #[cfg(feature = "desktop")]
             mouse_x: f32::from_bits(mouse_x.load(Ordering::Relaxed)) as f64,
@@ -1563,7 +1567,7 @@ mod tests {
             fill: false,
             nudge_secs: 0.0,
             current_time_us: 0,
-            audio_sample_pos: 0,
+            corrected_audio_pos: 0.0,
             sr: 48000.0,
             mouse_x: 0.5,
             mouse_y: 0.5,
@@ -1582,7 +1586,7 @@ mod tests {
             fill: false,
             nudge_secs: 0.0,
             current_time_us: 0,
-            audio_sample_pos: 0,
+            corrected_audio_pos: 0.0,
             sr: 48000.0,
             mouse_x: 0.5,
             mouse_y: 0.5,

src/init.rs

@@ -1,14 +1,16 @@
 use std::path::PathBuf;
-use std::sync::atomic::{AtomicBool, AtomicI64, AtomicU32, AtomicU64, Ordering};
+use std::sync::atomic::{AtomicBool, AtomicI64, AtomicU32, Ordering};
 use std::sync::Arc;
+use std::time::Instant;
 
+use arc_swap::ArcSwap;
 use doux::EngineMetrics;
 
 use crate::app::App;
 use crate::engine::{
-    build_stream, preload_sample_heads, spawn_sequencer, AnalysisHandle, AudioStreamConfig,
-    LinkState, PatternChange, ScopeBuffer, SequencerConfig, SequencerHandle,
-    SpectrumBuffer,
+    build_stream, preload_sample_heads, spawn_sequencer, AnalysisHandle, AudioRef,
+    AudioStreamConfig, LinkState, PatternChange, ScopeBuffer, SequencerConfig,
+    SequencerHandle, SpectrumBuffer,
 };
 use crate::midi;
 use crate::model;
@@ -36,7 +38,7 @@ pub struct Init {
     pub metrics: Arc<EngineMetrics>,
     pub scope_buffer: Arc<ScopeBuffer>,
     pub spectrum_buffer: Arc<SpectrumBuffer>,
-    pub audio_sample_pos: Arc<AtomicU64>,
+    pub audio_ref: Arc<ArcSwap<AudioRef>>,
     pub sample_rate_shared: Arc<AtomicU32>,
     pub stream: Option<cpal::Stream>,
     pub input_stream: Option<cpal::Stream>,
@@ -151,7 +153,11 @@ pub fn init(args: InitArgs) -> Init {
     let scope_buffer = Arc::new(ScopeBuffer::new());
     let spectrum_buffer = Arc::new(SpectrumBuffer::new());
 
-    let audio_sample_pos = Arc::new(AtomicU64::new(0));
+    let audio_ref = Arc::new(ArcSwap::from_pointee(AudioRef {
+        sample_pos: 0,
+        timestamp: Instant::now(),
+        sample_rate: 44100.0,
+    }));
     let sample_rate_shared = Arc::new(AtomicU32::new(44100));
     let mut initial_samples = Vec::new();
     for path in &app.audio.config.sample_paths {
@@ -177,7 +183,7 @@ pub fn init(args: InitArgs) -> Init {
     let mouse_down = Arc::new(AtomicU32::new(0.0_f32.to_bits()));
 
     let seq_config = SequencerConfig {
-        audio_sample_pos: Arc::clone(&audio_sample_pos),
+        audio_ref: Arc::clone(&audio_ref),
         sample_rate: Arc::clone(&sample_rate_shared),
         cc_access: Some(Arc::new(app.midi.cc_memory.clone()) as Arc<dyn model::CcAccess>),
         variables: Arc::clone(&app.variables),
@@ -218,7 +224,7 @@ pub fn init(args: InitArgs) -> Init {
         Arc::clone(&spectrum_buffer),
         Arc::clone(&metrics),
         initial_samples,
-        Arc::clone(&audio_sample_pos),
+        Arc::clone(&audio_ref),
         stream_error_tx,
         &app.audio.config.sample_paths,
         Arc::clone(&device_lost),
@@ -262,7 +268,7 @@ pub fn init(args: InitArgs) -> Init {
         metrics,
         scope_buffer,
         spectrum_buffer,
-        audio_sample_pos,
+        audio_ref,
         sample_rate_shared,
         stream,
         input_stream,

src/main.rs

@@ -96,7 +96,7 @@ fn main() -> io::Result<()> {
     let metrics = b.metrics;
     let scope_buffer = b.scope_buffer;
     let spectrum_buffer = b.spectrum_buffer;
-    let audio_sample_pos = b.audio_sample_pos;
+    let audio_ref = b.audio_ref;
     let sample_rate_shared = b.sample_rate_shared;
     let mut _stream = b.stream;
     let mut _input_stream = b.input_stream;
@@ -148,7 +148,11 @@ fn main() -> io::Result<()> {
                 }
             }
 
-            audio_sample_pos.store(0, Ordering::Relaxed);
+            audio_ref.store(Arc::new(engine::AudioRef {
+                sample_pos: 0,
+                timestamp: std::time::Instant::now(),
+                sample_rate: 44100.0,
+            }));
 
             let preload_entries: Vec<(String, std::path::PathBuf)> = restart_samples
                 .iter()
@@ -162,7 +166,7 @@ fn main() -> io::Result<()> {
                 Arc::clone(&spectrum_buffer),
                 Arc::clone(&metrics),
                 restart_samples,
-                Arc::clone(&audio_sample_pos),
+                Arc::clone(&audio_ref),
                 new_error_tx,
                 &app.audio.config.sample_paths,
                 Arc::clone(&device_lost),