[Cocos2D-x For WP8]CocosDenshion音频播放

时间 2019-11-06

标签 cocos2d cocos wp8 cocosdenshion 音频播放栏目 Cocos2d-x 繁體版

原文原文链接

Cocos2D-x的音频分为长时间的背景音乐和短的音效两种，咱们能够经过SimpleAudioEngine::sharedEngine()方法来获取音频播放的引擎，而后调用对音频相关的操做方法就能够了，那么这个是很是简单的。函数

在Cocos2D-x For WP8里面的要使用音频播放的API，咱们须要把CocosDenshion这个项目添加到咱们的游戏项目里面去，而后添加引用。以下图所示：this

须要注意的是若是发如今编译的时候会出现下面的错误，那么一般是由于没有添加CocosDenshionWindowsPhone.lib连接库。spa

错误 306 error LNK2019: unresolved external symbol "__declspec(dllimport) public: static class CocosDenshion::SimpleAudioEngine * __cdecl CocosDenshion::SimpleAudioEngine::sharedEngine(void)" (__imp_?sharedEngine@SimpleAudioEngine@CocosDenshion@@SAPAV12@XZ) referenced in function __unwind$26 F:\coco2d\cocos2dx-win8-wp8_v2\cocos2dx-win8-wp8_v2\HelloWorld\HelloWorldScene.obj HelloWorld3d

那么咱们就须要在VS2012上经过这个路径（ Project > Properties > Configuration Properties > Linker > Input > Additional Dependencies）来添加CocosDenshionWindowsPhone.lib连接库，以下图所示：code

示例代码：blog

class TestLayer : public cocos2d::CCLayer
{
public:
    TestLayer(void);
    ~TestLayer(void);
    void menuCallback(cocos2d::CCObject * pSender);
    virtual void ccTouchesMoved(cocos2d::CCSet *pTouches, cocos2d::CCEvent *pEvent);
    virtual void ccTouchesBegan(cocos2d::CCSet *pTouches, cocos2d::CCEvent *pEvent);

private:
    cocos2d::CCMenu* m_pItmeMenu;
    cocos2d::CCPoint m_tBeginPos;
    int m_nTestCount;
    unsigned int m_nSoundId;
};

TestLayer::TestLayer()
{
        std::string testItems[] = {
        "play background music",
        "stop background music",
        "pause background music",
        "resume background music",
        "rewind background music",
        "is background music playing",
        "play effect",
        "play effect repeatly",
        "stop effect",
        "unload effect",
        "add background music volume",
        "sub background music volume",
        "add effects volume",
        "sub effects volume",
        "pause effect",
        "resume effect",
        "pause all effects",
        "resume all effects",
        "stop all effects"
    };
    //建立菜单栏
    m_pItmeMenu = CCMenu::create();
    CCSize s = CCDirector::sharedDirector()->getWinSize();
    m_nTestCount = sizeof(testItems) / sizeof(testItems[0]);
    //添加菜单栏项目和点击的回掉函数
    for (int i = 0; i < m_nTestCount; ++i)
    {
        CCLabelTTF* label = CCLabelTTF::create(testItems[i].c_str(), "Arial", 24);
        CCMenuItemLabel* pMenuItem = CCMenuItemLabel::create(label, this, menu_selector(TestLayer::menuCallback));
        m_pItmeMenu->addChild(pMenuItem, i + 10000);
        pMenuItem->setPosition( CCPointMake( s.width / 2, (s.height - (i + 1) * LINE_SPACE) ));
    }
    //设置菜单栏的位置
    m_pItmeMenu->setContentSize(CCSizeMake(s.width, (m_nTestCount + 1) * LINE_SPACE));
    m_pItmeMenu->setPosition(CCPointZero);
    addChild(m_pItmeMenu);

    setTouchEnabled(true);

    //预加载背景音乐和音效
    SimpleAudioEngine::sharedEngine()->preloadBackgroundMusic( CCFileUtils::fullPathFromRelativePath(MUSIC_FILE) );
    SimpleAudioEngine::sharedEngine()->preloadEffect( CCFileUtils::fullPathFromRelativePath(EFFECT_FILE) );
    
    //设置默认的音量
    SimpleAudioEngine::sharedEngine()->setEffectsVolume(0.5);
    SimpleAudioEngine::sharedEngine()->setBackgroundMusicVolume(0.5);
}

TestLayer::~TestLayer()
{
}

void TestLayer::menuCallback(CCObject * pSender)
{
    //获取调用回掉函数的菜单，获取它的ZOrder，用于判断是那个菜单项触发的
    CCMenuItem* pMenuItem = (CCMenuItem *)(pSender);
    int nIdx = pMenuItem->getZOrder() - 10000;

    switch(nIdx)
    {
    // 播放背景音乐
    case 0:
        SimpleAudioEngine::sharedEngine()->playBackgroundMusic(std::string(CCFileUtils::fullPathFromRelativePath(MUSIC_FILE)).c_str(), true);
        break;
    // 中止背景音乐
    case 1:
        SimpleAudioEngine::sharedEngine()->stopBackgroundMusic();
        break;
    // 暂停背景音乐
    case 2:
        SimpleAudioEngine::sharedEngine()->pauseBackgroundMusic();
        break;
    // 恢复背景音乐
    case 3:
        SimpleAudioEngine::sharedEngine()->resumeBackgroundMusic();
        break;
    // 回放背景音乐
    case 4:
        SimpleAudioEngine::sharedEngine()->rewindBackgroundMusic();
        break;
    // 判断背景音乐是否正在播放
    case 5:
        if (SimpleAudioEngine::sharedEngine()->isBackgroundMusicPlaying())
        {
            CCLOG("background music is playing");
        }
        else
        {
            CCLOG("background music is not playing");
        }
        break;
    // 播放音效
    case 6:
        m_nSoundId = SimpleAudioEngine::sharedEngine()->playEffect(std::string(CCFileUtils::fullPathFromRelativePath(EFFECT_FILE)).c_str());
        break;
    // 重复播放音效
    case 7:
        m_nSoundId = SimpleAudioEngine::sharedEngine()->playEffect(std::string(CCFileUtils::fullPathFromRelativePath(EFFECT_FILE)).c_str(), true);
        break;
    // 中止播放音效
    case 8:
        SimpleAudioEngine::sharedEngine()->stopEffect(m_nSoundId);
        break;
    // 移除音效
    case 9:
        SimpleAudioEngine::sharedEngine()->unloadEffect(std::string(CCFileUtils::fullPathFromRelativePath(EFFECT_FILE)).c_str());
        break;
        // 添加背景音乐音量
    case 10:
        SimpleAudioEngine::sharedEngine()->setBackgroundMusicVolume(SimpleAudioEngine::sharedEngine()->getBackgroundMusicVolume() + 0.1f);
        break;
        // 减小背景音乐音量
    case 11:
        SimpleAudioEngine::sharedEngine()->setBackgroundMusicVolume(SimpleAudioEngine::sharedEngine()->getBackgroundMusicVolume() - 0.1f);
        break;
        // 添加音效音量
    case 12:
        SimpleAudioEngine::sharedEngine()->setEffectsVolume(SimpleAudioEngine::sharedEngine()->getEffectsVolume() + 0.1f);
        break;
        // 减小背景音乐音量
    case 13:
        SimpleAudioEngine::sharedEngine()->setEffectsVolume(SimpleAudioEngine::sharedEngine()->getEffectsVolume() - 0.1f);
        break;
        //暂停音效播放
    case 14:
        SimpleAudioEngine::sharedEngine()->pauseEffect(m_nSoundId);
        break;
    case 15:
        //恢复音效播放
        SimpleAudioEngine::sharedEngine()->resumeEffect(m_nSoundId);
        break;
        //暂停全部音效播放
    case 16:
        SimpleAudioEngine::sharedEngine()->pauseAllEffects();
        break;
    case 17:
        //恢复全部音效播放
        SimpleAudioEngine::sharedEngine()->resumeAllEffects();
        break;
    case 18:
        //中止暂停全部音效播放
        SimpleAudioEngine::sharedEngine()->stopAllEffects();
        break;
    }
    
}

void TestLayer::ccTouchesBegan(CCSet *pTouches, CCEvent *pEvent)
{
    CCSetIterator it = pTouches->begin();
    CCTouch* touch = (CCTouch*)(*it);

    m_tBeginPos = touch->getLocationInView();    
    m_tBeginPos = CCDirector::sharedDirector()->convertToGL( m_tBeginPos );
}
//处理菜单栏的滑动
void TestLayer::ccTouchesMoved(CCSet *pTouches, CCEvent *pEvent)
{
    CCSetIterator it = pTouches->begin();
    CCTouch* touch = (CCTouch*)(*it);

    CCPoint touchLocation = touch->getLocationInView();    
    touchLocation = CCDirector::sharedDirector()->convertToGL( touchLocation );
    float nMoveY = touchLocation.y - m_tBeginPos.y;

    CCPoint curPos  = m_pItmeMenu->getPosition();
    CCPoint nextPos = ccp(curPos.x, curPos.y + nMoveY);
    CCSize winSize = CCDirector::sharedDirector()->getWinSize();
    if (nextPos.y < 0.0f)
    {
        m_pItmeMenu->setPosition(CCPointZero);
        return;
    }

    if (nextPos.y > ((m_nTestCount + 1)* LINE_SPACE - winSize.height))
    {
        m_pItmeMenu->setPosition(ccp(0, ((m_nTestCount + 1)* LINE_SPACE - winSize.height)));
        return;
    }

    m_pItmeMenu->setPosition(nextPos);
    m_tBeginPos = touchLocation;
}

运行效果：
游戏