audio/internal/readerdriver: Experimental increase of buffers

Also, this change reduces goroutine uses for efficiency.

Updates #1768

audio/internal/readerdriver/driver_windows.go

@@ -22,7 +22,7 @@ import (
 	"golang.org/x/sys/windows"
 )
 
-const headerBufferSize = 4096
+const headerBufferSize = 8192
 
 func IsAvailable() bool {
 	return true
@@ -117,7 +117,7 @@ func NewContext(sampleRate, channelNum, bitDepthInBytes int) (Context, chan stru
 	}
 
 	c.waveOut = w
-	c.headers = make([]*header, 0, 4)
+	c.headers = make([]*header, 0, 3)
 	for len(c.headers) < cap(c.headers) {
 		h, err := newHeader(c.waveOut, headerBufferSize)
 		if err != nil {

audio/internal/readerdriver/player_notjs.go

@@ -156,15 +156,23 @@ func (p *player) Play() {
 }
 
 func (p *playerImpl) Play() {
-	ch := make(chan struct{})
+	// Goroutines don't work effiently on Windows. Avoid using them (#1768).
-	go func() {
+	if runtime.GOOS == "windows" {
 		p.m.Lock()
 		defer p.m.Unlock()
 
-		close(ch)
 		p.playImpl()
-	}()
+	} else {
-	<-ch
+		ch := make(chan struct{})
+		go func() {
+			p.m.Lock()
+			defer p.m.Unlock()
+
+			close(ch)
+			p.playImpl()
+		}()
+		<-ch
+	}
 }
 
 func (p *playerImpl) playImpl() {