Feat: fixing stderr catching and scope not drawing completely

src/engine/audio.rs

@@ -251,7 +251,7 @@ use cpal::traits::{DeviceTrait, StreamTrait};
 #[cfg(feature = "cli")]
 use cpal::Stream;
 #[cfg(feature = "cli")]
-use crossbeam_channel::Receiver;
+use crossbeam_channel::{Receiver, Sender};
 #[cfg(feature = "cli")]
 use doux::{Engine, EngineMetrics};
 
@@ -274,6 +274,7 @@ pub struct AudioStreamInfo {
 }
 
 #[cfg(feature = "cli")]
+#[allow(clippy::too_many_arguments)]
 pub fn build_stream(
     config: &AudioStreamConfig,
     audio_rx: Receiver<AudioCommand>,
@@ -282,6 +283,7 @@ pub fn build_stream(
     metrics: Arc<EngineMetrics>,
     initial_samples: Vec<doux::sampling::SampleEntry>,
     audio_sample_pos: Arc<AtomicU64>,
+    error_tx: Sender<String>,
 ) -> Result<
     (
         Stream,
@@ -375,15 +377,15 @@ pub fn build_stream(
 
                 engine.metrics.load.set_buffer_time(buffer_time_ns);
                 engine.process_block(data, &[], &[]);
-                scope_buffer.write(&engine.output);
+                scope_buffer.write(data);
 
                 // Feed mono mix to analysis thread via ring buffer (non-blocking)
-                for chunk in engine.output.chunks(channels) {
+                for chunk in data.chunks(channels) {
                     let mono = chunk.iter().sum::<f32>() / channels as f32;
                     let _ = fft_producer.try_push(mono);
                 }
             },
-            |err| eprintln!("stream error: {err}"),
+            move |err| { let _ = error_tx.try_send(format!("stream error: {err}")); },
             None,
         )
         .map_err(|e| format!("Failed to build stream: {e}"))?;