fixed buffer size

gb-emu/src/audio.rs

@@ -6,6 +6,7 @@ use futures::executor;
 use gb_emu_lib::connect::{AudioOutput, DownsampleType};
 
 const BUFFERS_PER_FRAME: usize = 5;
+const DEFAULT_BUFFER_SIZE: u32 = 64;
 const DOWNSAMPLE_TYPE: DownsampleType = DownsampleType::ZeroOrderHold;
 
 pub fn create_output(muted: bool) -> (AudioOutput, Stream) {
@@ -21,12 +22,20 @@ pub fn create_output(muted: bool) -> (AudioOutput, Stream) {
 
     let sample_rate = config.sample_rate().0;
 
+    let mut stream_config = config.config();
+
+    if let cpal::SupportedBufferSize::Range { min, max } = config.buffer_size() {
+        stream_config.buffer_size =
+            cpal::BufferSize::Fixed(DEFAULT_BUFFER_SIZE.min(*max).max(*min));
+    }
+    println!("got buffer size {:#?}", stream_config.buffer_size);
+
     let (output, mut rx) = AudioOutput::new(sample_rate as f32, BUFFERS_PER_FRAME, DOWNSAMPLE_TYPE);
 
     let stream = if muted {
         device
             .build_output_stream(
-                &config.config(),
+                &stream_config,
                 move |data: &mut [f32], _info: &cpal::OutputCallbackInfo| {
                     for _ in data.chunks_exact_mut(2) {
                         match executor::block_on(rx.pop()) {
@@ -60,6 +69,7 @@ pub fn create_output(muted: bool) -> (AudioOutput, Stream) {
             )
             .unwrap()
     };
+
     stream.play().unwrap();
 
     (output, stream)