fix audio bugs

- reset buffer even if no device;
- keep audio device on Gameboy::reset

yarge-core/src/api.rs

@@ -189,6 +189,18 @@ impl Gameboy {
     self.cpu.bus.apu.device = Some(Box::new(device));
   }
 
+  #[inline] pub fn get_audio_device(&mut self) -> Option<&dyn AudioDevice> {
+    self.cpu.bus.apu.device.as_ref().map(|x| x.as_ref())
+  }
+
+  #[inline] pub fn get_audio_device_mut(&mut self) -> Option<&mut Box<dyn AudioDevice>> {
+    self.cpu.bus.apu.device.as_mut()
+  }
+
+  #[inline] pub fn remove_audio_device(&mut self) -> Option<Box<dyn AudioDevice>> {
+    self.cpu.bus.apu.device.take()
+  }
+
   #[inline] pub fn has_save_data(&self) -> bool {
     self.cpu.bus.cart.has_save_data()
   }

yarge-core/src/apu.rs

@@ -88,8 +88,8 @@ impl Apu {
       if self.buffer.is_full() {
         if let Some(device) = self.device.as_mut() {
           device.queue_samples(self.buffer.get_buffer());
-          self.buffer.reset();
         }
+          self.buffer.reset();
       }
     }
   }

yarge-core/src/lib.rs

@@ -86,7 +86,10 @@ impl Gameboy {
   }
 
   pub fn reset(&mut self) {
+    //MAYBE: option to keep rom?
+    let device = self.cpu.bus.apu.device.take();
     self.cpu = Cpu::new();
+    self.cpu.bus.apu.device = device;
   }
 
   #[cfg(feature = "dbg-logging")]