clamp audio options

src/engine/audio.rs

@@ -255,6 +255,9 @@ pub fn build_stream(
     let default_config = device.default_output_config().map_err(|e| e.to_string())?;
     let sample_rate = default_config.sample_rate() as f32;
 
+    let max_channels = doux::audio::max_output_channels(&device);
+    let channels = config.channels.min(max_channels);
+
     let buffer_size = if config.buffer_size > 0 {
         cpal::BufferSize::Fixed(config.buffer_size)
     } else {
@@ -262,13 +265,13 @@ pub fn build_stream(
     };
 
     let stream_config = cpal::StreamConfig {
-        channels: config.channels,
+        channels,
         sample_rate: default_config.sample_rate(),
         buffer_size,
     };
 
     let sr = sample_rate;
-    let channels = config.channels as usize;
+    let channels = channels as usize;
     let max_voices = config.max_voices;
 
     let mut engine =