Feat: background head-preload for sample libraries

src/bin/desktop.rs

@@ -15,11 +15,11 @@ use soft_ratatui::embedded_graphics_unicodefonts::{
 };
 use soft_ratatui::{EmbeddedGraphics, SoftBackend};
 
-use cagire::init::{init, InitArgs};
 use cagire::engine::{
     build_stream, AnalysisHandle, AudioStreamConfig, LinkState, MidiCommand, ScopeBuffer,
     SequencerHandle, SpectrumBuffer,
 };
+use cagire::init::{init, InitArgs};
 use cagire::input::{handle_key, InputContext, InputResult};
 use cagire::input_egui::convert_egui_events;
 use cagire::settings::Settings;
@@ -218,6 +218,11 @@ impl CagireDesktop {
 
         self.audio_sample_pos.store(0, Ordering::Release);
 
+        let preload_entries: Vec<(String, std::path::PathBuf)> = restart_samples
+            .iter()
+            .map(|e| (e.name.clone(), e.path.clone()))
+            .collect();
+
         match build_stream(
             &new_config,
             new_audio_rx,
@@ -227,7 +232,7 @@ impl CagireDesktop {
             restart_samples,
             Arc::clone(&self.audio_sample_pos),
         ) {
-            Ok((new_stream, info, new_analysis)) => {
+            Ok((new_stream, info, new_analysis, registry)) => {
                 self._stream = Some(new_stream);
                 self._analysis_handle = Some(new_analysis);
                 self.app.audio.config.sample_rate = info.sample_rate;
@@ -236,7 +241,18 @@ impl CagireDesktop {
                 self.sample_rate_shared
                     .store(info.sample_rate as u32, Ordering::Relaxed);
                 self.app.audio.error = None;
+                self.app.audio.sample_registry = Some(std::sync::Arc::clone(&registry));
                 self.app.ui.set_status("Audio restarted".to_string());
+
+                if !preload_entries.is_empty() {
+                    let sr = info.sample_rate;
+                    std::thread::Builder::new()
+                        .name("sample-preload".into())
+                        .spawn(move || {
+                            cagire::init::preload_sample_heads(preload_entries, sr, &registry);
+                        })
+                        .expect("failed to spawn preload thread");
+                }
             }
             Err(e) => {
                 self.app.audio.error = Some(e.clone());