From 541156f255d7e820a6dffd5d15eeeae204bf9107 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Fri, 28 May 2021 16:16:56 +0900
Subject: [PATCH] audio/internal/readerdriver: Wait the loop when there is no
 player (Windows)

---
 audio/internal/readerdriver/driver_windows.go | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/audio/internal/readerdriver/driver_windows.go b/audio/internal/readerdriver/driver_windows.go
index f78ee85d5..5906859d2 100644
--- a/audio/internal/readerdriver/driver_windows.go
+++ b/audio/internal/readerdriver/driver_windows.go
@@ -123,6 +123,7 @@ func (p *players) add(player *playerImpl) error {
 		p.players = map[*playerImpl]struct{}{}
 	}
 	p.players[player] = struct{}{}
+	p.cond.Signal()
 
 	if p.waveOut != 0 {
 		return nil
@@ -183,6 +184,10 @@ func (p *players) removeImpl(player *playerImpl) error {
 }
 
 func (p *players) shouldWait() bool {
+	if len(p.players) == 0 {
+		return true
+	}
+
 	if p.waveOut == 0 {
 		return false
 	}
@@ -271,6 +276,10 @@ func (p *players) readAndWriteBuffers() error {
 }
 
 func (p *players) readAndWriteBuffersImpl() error {
+	if len(p.players) == 0 {
+		return nil
+	}
+
 	headerNum := 0
 	for _, h := range p.headers {
 		if h.IsQueued() {