use a bigger buffer size for macOS

Author: hajimehoshi

driver_darwin.go

@@ -88,6 +88,13 @@ type context struct {
 var theContext *context
 
 func newContext(sampleRate int, channelCount int, format mux.Format, bufferSizeInBytes int) (*context, chan struct{}, error) {
+	// defaultOneBufferSizeInBytes is the default buffer size in bytes.
+	//
+	// 12288 seems necessary at least on iPod touch (7th) and MacBook Pro 2020.
+	// With 48000[Hz] stereo, the maximum delay is (12288*4[buffers] / 4 / 2)[samples] / 48000 [Hz] = 100[ms].
+	// '4' is float32 size in bytes. '2' is a number of channels for stereo.
+	const defaultOneBufferSizeInBytes = 12288
+
 	var oneBufferSizeInBytes int
 	if bufferSizeInBytes != 0 {
 		oneBufferSizeInBytes = bufferSizeInBytes / bufferCount

driver_ios.go

@@ -16,12 +16,6 @@
 
 package oto
 
-// 12288 seems necessary at least on iPod touch (7th).
-// With 48000[Hz] stereo, the maximum delay is (12288*4[buffers] / 4 / 2)[samples] / 48000 [Hz] = 100[ms].
-// '4' is float32 size in bytes. '2' is a number of channels for stereo.
-
-const defaultOneBufferSizeInBytes = 12288
-
 func setNotificationHandler() error {
 	// AVAudioSessionInterruptionNotification is not reliable on iOS. Rely on
 	// applicationWillResignActive and applicationDidBecomeActive instead. See

driver_macos.go

@@ -23,8 +23,6 @@ import (
 	"github.com/ebitengine/purego/objc"
 )
 
-const defaultOneBufferSizeInBytes = 8192
-
 // setNotificationHandler sets a handler for sleep/wake notifications.
 func setNotificationHandler() error {
 	appkit, err := purego.Dlopen("/System/Library/Frameworks/AppKit.framework/Versions/Current/AppKit", purego.RTLD_GLOBAL)