From 84fd73630af22557c516afd3b2c6ad0e31534097 Mon Sep 17 00:00:00 2001
From: Justin Hawkwood <justin@hawkwood.com>
Date: Fri, 3 Apr 2015 15:57:47 -0700
Subject: [PATCH] Fix iOS 5.1.1 crash caused by interruptionHandler

checks OS version and sets handling based on what is available.
---
 cocos/audio/apple/AudioEngine-inl.mm | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/cocos/audio/apple/AudioEngine-inl.mm b/cocos/audio/apple/AudioEngine-inl.mm
index e01b99586e..0f9bc4df00 100644
--- a/cocos/audio/apple/AudioEngine-inl.mm
+++ b/cocos/audio/apple/AudioEngine-inl.mm
@@ -141,11 +141,31 @@ namespace cocos2d {
 
 @implementation AudioEngineSessionHandler
 
+void AudioEngineInterruptionListenerCallback(void* user_data, UInt32 interruption_state)
+{
+    if (kAudioSessionBeginInterruption == interruption_state)
+    {
+      alcMakeContextCurrent(nullptr);
+    }
+    else if (kAudioSessionEndInterruption == interruption_state)
+    {
+      OSStatus result = AudioSessionSetActive(true);
+      if (result) NSLog(@"Error setting audio session active! %d\n", result);
+
+      alcMakeContextCurrent(s_ALContext);
+    }
+}
+
 -(id) init
 {
     if (self == [super init])
     {
+      if ([[[UIDevice currentDevice] systemVersion] intValue] > 5) {
         [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleInterruption:) name:AVAudioSessionInterruptionNotification object:[AVAudioSession sharedInstance]];
+      }
+      else {
+        AudioSessionInitialize(NULL, NULL, AudioEngineInterruptionListenerCallback, self);
+      }
     }
     return self;
 }