From a225f666ac7075e4d81513a427806d56ea6f3b6e Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Thu, 17 Aug 2017 11:48:29 +0900
Subject: [PATCH] audio: Bug fix: Race condition on 'pos' member (#413)

---
 audio/audio.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/audio/audio.go b/audio/audio.go
index c7293090c..4bad6386e 100644
--- a/audio/audio.go
+++ b/audio/audio.go
@@ -451,8 +451,10 @@ func (p *Player) bufferToInt16(lengthInBytes int) []int16 {
 
 func (p *Player) proceed(length int) {
 	// This function must be called on the same goruotine of readToBuffer.
+	p.m.Lock()
 	p.buf = p.buf[length:]
 	p.pos += int64(length)
+	p.m.Unlock()
 }
 
 // Play plays the stream.