fixes PR005

crates/host/prometeu-host-desktop-winit/src/audio.rs

@@ -1,15 +1,96 @@
 use cpal::traits::{DeviceTrait, HostTrait, StreamTrait};
 use prometeu_drivers::{AudioCommand, Channel, MAX_CHANNELS, OUTPUT_SAMPLE_RATE};
 use prometeu_hal::LoopMode;
-use ringbuf::HeapRb;
 use ringbuf::traits::{Consumer, Producer, Split};
+use ringbuf::HeapRb;
+use std::error::Error;
+use std::fmt;
 use std::sync::Arc;
 use std::time::Duration;
 
+trait AudioStreamHandle {}
+
+impl AudioStreamHandle for cpal::Stream {}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum HostAudioError {
+    NoOutputDevice,
+    BuildStream(String),
+    PlayStream(String),
+}
+
+impl fmt::Display for HostAudioError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            HostAudioError::NoOutputDevice => write!(f, "no output device available"),
+            HostAudioError::BuildStream(err) => write!(f, "failed to build audio stream: {}", err),
+            HostAudioError::PlayStream(err) => write!(f, "failed to play audio stream: {}", err),
+        }
+    }
+}
+
+impl Error for HostAudioError {}
+
+trait AudioRuntime {
+    type Device;
+    type Stream: AudioStreamHandle + 'static;
+
+    fn default_output_device(&self) -> Option<Self::Device>;
+
+    fn build_output_stream<D, E>(
+        &self,
+        device: &Self::Device,
+        config: &cpal::StreamConfig,
+        data_callback: D,
+        error_callback: E,
+    ) -> Result<Self::Stream, HostAudioError>
+    where
+        D: FnMut(&mut [f32]) + Send + 'static,
+        E: FnMut(String) + Send + 'static;
+
+    fn play_stream(&self, stream: &Self::Stream) -> Result<(), HostAudioError>;
+}
+
+struct CpalAudioRuntime;
+
+impl AudioRuntime for CpalAudioRuntime {
+    type Device = cpal::Device;
+    type Stream = cpal::Stream;
+
+    fn default_output_device(&self) -> Option<Self::Device> {
+        cpal::default_host().default_output_device()
+    }
+
+    fn build_output_stream<D, E>(
+        &self,
+        device: &Self::Device,
+        config: &cpal::StreamConfig,
+        mut data_callback: D,
+        mut error_callback: E,
+    ) -> Result<Self::Stream, HostAudioError>
+    where
+        D: FnMut(&mut [f32]) + Send + 'static,
+        E: FnMut(String) + Send + 'static,
+    {
+        device
+            .build_output_stream(
+                config,
+                move |data: &mut [f32], _: &cpal::OutputCallbackInfo| data_callback(data),
+                move |err| error_callback(err.to_string()),
+                None,
+            )
+            .map_err(|err| HostAudioError::BuildStream(err.to_string()))
+    }
+
+    fn play_stream(&self, stream: &Self::Stream) -> Result<(), HostAudioError> {
+        stream.play().map_err(|err| HostAudioError::PlayStream(err.to_string()))
+    }
+}
+
 pub struct HostAudio {
     pub producer: Option<ringbuf::wrap::CachingProd<Arc<HeapRb<AudioCommand>>>>,
     pub perf_consumer: Option<ringbuf::wrap::CachingCons<Arc<HeapRb<u64>>>>,
-    _stream: Option<cpal::Stream>,
+    _stream: Option<Box<dyn AudioStreamHandle>>,
 }
 
 impl HostAudio {
@@ -17,9 +98,16 @@ impl HostAudio {
         Self { producer: None, perf_consumer: None, _stream: None }
     }
 
-    pub fn init(&mut self) {
-        let host = cpal::default_host();
-        let device = host.default_output_device().expect("no output device available");
+    pub fn init(&mut self) -> Result<(), HostAudioError> {
+        self.init_with_runtime(&CpalAudioRuntime)
+    }
+
+    fn init_with_runtime<R: AudioRuntime>(&mut self, runtime: &R) -> Result<(), HostAudioError> {
+        self.producer = None;
+        self.perf_consumer = None;
+        self._stream = None;
+
+        let device = runtime.default_output_device().ok_or(HostAudioError::NoOutputDevice)?;
 
         let config = cpal::StreamConfig {
             channels: 2,
@@ -30,18 +118,16 @@ impl HostAudio {
         let rb = HeapRb::<AudioCommand>::new(1024);
         let (prod, mut cons) = rb.split();
 
-        self.producer = Some(prod);
-
         let mut mixer = AudioMixer::new();
 
         // To pass performance data from the audio thread to the main thread
         let audio_perf_rb = HeapRb::<u64>::new(64);
         let (mut perf_prod, perf_cons) = audio_perf_rb.split();
 
-        let stream = device
-            .build_output_stream(
+        let stream = runtime.build_output_stream(
+            &device,
             &config,
-                move |data: &mut [f32], _: &cpal::OutputCallbackInfo| {
+            move |data: &mut [f32]| {
                 // Consumes commands from ringbuffer
                 while let Some(cmd) = cons.try_pop() {
                     mixer.process_command(cmd);
@@ -52,13 +138,13 @@ impl HostAudio {
                 let _ = perf_prod.try_push(mixer.last_processing_time.as_micros() as u64);
             },
             |err| eprintln!("audio stream error: {}", err),
-                None,
-            )
-            .expect("failed to build audio stream");
+        )?;
 
-        stream.play().expect("failed to play audio stream");
-        self._stream = Some(stream);
+        runtime.play_stream(&stream)?;
+        self.producer = Some(prod);
         self.perf_consumer = Some(perf_cons);
+        self._stream = Some(Box::new(stream));
+        Ok(())
     }
 
     pub fn send_commands(&mut self, commands: &mut Vec<AudioCommand>) {
@@ -68,6 +154,8 @@ impl HostAudio {
                     eprintln!("[HostAudio] Command ringbuffer full, dropping command.");
                 }
             }
+        } else {
+            commands.clear();
         }
     }
 
@@ -80,6 +168,133 @@ impl HostAudio {
     }
 }
 
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::stats::HostStats;
+
+    struct FakeStream;
+
+    impl AudioStreamHandle for FakeStream {}
+
+    #[derive(Clone, Copy)]
+    struct FakeDevice;
+
+    struct FakeRuntime {
+        has_device: bool,
+        build_result: Result<(), HostAudioError>,
+        play_result: Result<(), HostAudioError>,
+    }
+
+    impl AudioRuntime for FakeRuntime {
+        type Device = FakeDevice;
+        type Stream = FakeStream;
+
+        fn default_output_device(&self) -> Option<Self::Device> {
+            self.has_device.then_some(FakeDevice)
+        }
+
+        fn build_output_stream<D, E>(
+            &self,
+            _device: &Self::Device,
+            _config: &cpal::StreamConfig,
+            _data_callback: D,
+            _error_callback: E,
+        ) -> Result<Self::Stream, HostAudioError>
+        where
+            D: FnMut(&mut [f32]) + Send + 'static,
+            E: FnMut(String) + Send + 'static,
+        {
+            self.build_result.clone().map(|_| FakeStream)
+        }
+
+        fn play_stream(&self, _stream: &Self::Stream) -> Result<(), HostAudioError> {
+            self.play_result.clone()
+        }
+    }
+
+    #[test]
+    fn test_send_commands_without_audio_drops_pending_commands() {
+        let mut audio = HostAudio::new();
+        let mut commands = vec![AudioCommand::MasterPause, AudioCommand::MasterResume];
+
+        audio.send_commands(&mut commands);
+
+        assert!(commands.is_empty());
+        assert!(audio.producer.is_none());
+    }
+
+    #[test]
+    fn test_update_stats_without_audio_is_safe() {
+        let mut audio = HostAudio::new();
+        let mut stats = HostStats::new();
+
+        audio.update_stats(&mut stats);
+
+        assert_eq!(stats.audio_load_accum_us, 0);
+        assert_eq!(stats.audio_load_samples, 0);
+    }
+
+    #[test]
+    fn test_init_returns_error_when_no_output_device_exists() {
+        let mut audio = HostAudio::new();
+        let runtime = FakeRuntime { has_device: false, build_result: Ok(()), play_result: Ok(()) };
+
+        let result = audio.init_with_runtime(&runtime);
+
+        assert_eq!(result, Err(HostAudioError::NoOutputDevice));
+        assert!(audio.producer.is_none());
+        assert!(audio.perf_consumer.is_none());
+        assert!(audio._stream.is_none());
+    }
+
+    #[test]
+    fn test_init_returns_error_when_stream_build_fails() {
+        let mut audio = HostAudio::new();
+        let runtime = FakeRuntime {
+            has_device: true,
+            build_result: Err(HostAudioError::BuildStream("simulated build failure".to_string())),
+            play_result: Ok(()),
+        };
+
+        let result = audio.init_with_runtime(&runtime);
+
+        assert_eq!(result, Err(HostAudioError::BuildStream("simulated build failure".to_string())));
+        assert!(audio.producer.is_none());
+        assert!(audio.perf_consumer.is_none());
+        assert!(audio._stream.is_none());
+    }
+
+    #[test]
+    fn test_init_returns_error_when_stream_play_fails() {
+        let mut audio = HostAudio::new();
+        let runtime = FakeRuntime {
+            has_device: true,
+            build_result: Ok(()),
+            play_result: Err(HostAudioError::PlayStream("simulated play failure".to_string())),
+        };
+
+        let result = audio.init_with_runtime(&runtime);
+
+        assert_eq!(result, Err(HostAudioError::PlayStream("simulated play failure".to_string())));
+        assert!(audio.producer.is_none());
+        assert!(audio.perf_consumer.is_none());
+        assert!(audio._stream.is_none());
+    }
+
+    #[test]
+    fn test_init_populates_audio_state_on_success() {
+        let mut audio = HostAudio::new();
+        let runtime = FakeRuntime { has_device: true, build_result: Ok(()), play_result: Ok(()) };
+
+        audio.init_with_runtime(&runtime).unwrap();
+
+        assert!(audio.producer.is_some());
+        assert!(audio.perf_consumer.is_some());
+        assert!(audio._stream.is_some());
+    }
+}
+
 pub struct AudioMixer {
     voices: [Channel; MAX_CHANNELS],
     pub last_processing_time: Duration,

crates/host/prometeu-host-desktop-winit/src/runner.rs

@@ -7,8 +7,8 @@ use crate::stats::HostStats;
 use crate::utilities::draw_rgb565_to_rgba8;
 use pixels::wgpu::PresentMode;
 use pixels::{Pixels, PixelsBuilder, SurfaceTexture};
-use prometeu_drivers::AudioCommand;
 use prometeu_drivers::hardware::Hardware;
+use prometeu_drivers::AudioCommand;
 use prometeu_firmware::{BootTarget, Firmware};
 use prometeu_hal::color::Color;
 use prometeu_hal::telemetry::CertificationConfig;
@@ -238,7 +238,9 @@ impl ApplicationHandler for HostRunner {
 
         self.pixels = Some(pixels);
 
-        self.audio.init();
+        if let Err(err) = self.audio.init() {
+            eprintln!("[HostAudio] Disabled: {}", err);
+        }
 
         event_loop.set_control_flow(ControlFlow::Poll);
     }