Cleanup AudioEngine resource after exiting NewAudioEngineTest. (cocos2d#17675)

* Unschedules update in AudioEngine implementation while AudioEngine::end is called.

* Cleanup AudioEngine resource after exiting NewAudioEngineTest.

Author: James Chen

cocos/audio/apple/AudioEngine-inl.mm

@@ -192,12 +192,18 @@ -(void) dealloc
 AudioEngineImpl::AudioEngineImpl()
 : _lazyInitLoop(true)
 , _currentAudioID(0)
+, _scheduler(nullptr)
 {
 
 }
 
 AudioEngineImpl::~AudioEngineImpl()
 {
+    if (_scheduler != nullptr)
+    {
+        _scheduler->unschedule(CC_SCHEDULE_SELECTOR(AudioEngineImpl::update), this);
+    }
+
     if (s_ALContext) {
         alDeleteSources(MAX_AUDIOINSTANCES, _alSources);
 

cocos/audio/win32/AudioEngine-win32.cpp

@@ -112,12 +112,18 @@ static ALCcontext *s_ALContext = nullptr;
 AudioEngineImpl::AudioEngineImpl()
 : _lazyInitLoop(true)
 , _currentAudioID(0)
+, _scheduler(nullptr)
 {
 
 }
 
 AudioEngineImpl::~AudioEngineImpl()
 {
+    if (_scheduler != nullptr)
+    {
+        _scheduler->unschedule(CC_SCHEDULE_SELECTOR(AudioEngineImpl::update), this);
+    }
+
     if (s_ALContext) {
         alDeleteSources(MAX_AUDIOINSTANCES, _alSources);
 

cocos/audio/winrt/AudioEngine-winrt.cpp

@@ -38,6 +38,8 @@ AudioEngineImpl::AudioEngineImpl()
 
 AudioEngineImpl::~AudioEngineImpl()
 {
+    auto scheduler = cocos2d::Director::getInstance()->getScheduler();
+    scheduler->unschedule(schedule_selector(AudioEngineImpl::update), this);
     _audioCaches.clear();
 }
 

tests/cpp-tests/Classes/NewAudioEngineTest/NewAudioEngineTest.cpp

@@ -207,6 +207,12 @@ std::string AudioEngineTestDemo::title() const
     return "New Audio Engine Test";
 }
 
+void AudioEngineTestDemo::onBackCallback(cocos2d::Ref* sender)
+{
+    AudioEngine::end();
+    TestCase::onBackCallback(sender);
+}
+
 // AudioControlTest
 bool AudioControlTest::init()
 {

tests/cpp-tests/Classes/NewAudioEngineTest/NewAudioEngineTest.h

@@ -41,6 +41,9 @@ class AudioEngineTestDemo : public TestCase
 
     virtual std::string title() const override;
     virtual void onExit() override;
+
+    virtual void onBackCallback(cocos2d::Ref* sender) override;
+
 protected:
     std::shared_ptr<bool> _isDestroyed;
 };