Cocos2d-x中背景音乐和音效使用实例

游戏中的音乐和音效是必不可少的，好的音乐可以给我们留下很深的印象也决定了这个游戏的品质。今天我们来学习一下cocos2d-x中如何使用音乐和音效。这些用到的函数都比较简单，现在直接上代码。

//声音预先处理类的头文件

#ifndef _AUDIO_PRETREAT_H

#define _AUDIO_PRETREAT_H

#include "cocos2d.h"

//使用声音引擎必须包含SimpleAudioEngeim.h头文件

#include "SimpleAudioEngine.h"

using namespace cocos2d;

//声音引擎的命名空间

using namespace CocosDenshion;

//类AudioPretrea采用单例设计模式

//把用到的音乐做为枚举类型

enum MUSIC_TYPE

{

MUSIC_TYPE_BACKGROUND //背景音乐

};

//把用到的音乐做为枚举类型

enum EFFECT_TYPE

{

EFFECT_TYPE_EFFECT1

};

class AudioPretreat

{

private:

static AudioPretreat * m_audioPretreat;

public:

//单例设计的时候需要用到的俩个函数

static AudioPretreat * sharedAudioPretreat();

static void freeAudioPretreat();

//可以根据不同的平台获取不同的声音文件

char * getMusic(MUSIC_TYPE type);

char * getEffect(EFFECT_TYPE type);

//在init中完成声音的预先加载

bool init();

};

#endif

//声音预先处理类的实现

#include "AudioPretreat.h"

//单例设计模式采用的惯用方式

AudioPretreat * AudioPretreat::m_audioPretreat = NULL;

AudioPretreat * AudioPretreat::sharedAudioPretreat()

{

if(NULL == m_audioPretreat)

{

m_audioPretreat = new AudioPretreat();

}

return m_audioPretreat;

}

//在AppDelegate析构的时候调用这个函数

void AudioPretreat::freeAudioPretreat()

{

if(m_audioPretreat)

{

delete m_audioPretreat;

m_audioPretreat = NULL;

}

//根据不同的平台获得不同的声音文件

char * AudioPretreat::getMusic(MUSIC_TYPE type)

{

switch(type)

{

case MUSIC_TYPE_BACKGROUND:

//WIN32,ANDROID,IOS都使用MP3格式的背景音乐

#if(CC_TARGET_PLATFORM == CC_PLATFORM_WIN32)

return "background-music.mp3";

#else(CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)

return "background-music.mp3";

#endif

break;

}

return NULL;

}

//根据不同的平台获得不同的音效文件

char * AudioPretreat::getEffect(EFFECT_TYPE type)

{

switch(type)

{

case EFFECT_TYPE_EFFECT1:

#if(CC_TARGET_PLATFORM == CC_PLATFORM_WIN32)

return "pew-pew-lei.wav";

#else(CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)

return "pew-pew-lei.ogg";

#endif

}

return NULL;

}

//init函数中完成一些初始化的操作

bool AudioPretreat::init()

{

bool bRet = false;

do

{

//预先加载声音，参数是声音文件

SimpleAudioEngine::sharedEngine()->preloadBackgroundMusic(this->getMusic(MUSIC_TYPE_BACKGROUND));

//加载音效

SimpleAudioEngine::sharedEngine()->preloadEffect(this->getEffect(EFFECT_TYPE_EFFECT1));

//设置声音的大小0.0-1.0

SimpleAudioEngine::sharedEngine()->setBackgroundMusicVolume(0.1f);

bRet = true;

}

while(0);

return bRet;

}

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// 下面就来看一下如何使用声音引擎

bool HelloWorld::init()

{

bool bRet = false;

do

{

CC_BREAK_IF(! CCLayer::init());

CCSize size = CCDirector::sharedDirector()->getVisibleSize();

AudioPretreat::sharedAudioPretreat()->init();

//以下是对背景音乐的一些操作

//设置字符串，并且转码

std::string str1 = "播放背景音乐";

std::string str2 = "停止背景音乐";

std::string str3 = "暂停背景音乐";

std::string str4 = "恢复背景音乐";

std::string str5 = "重头播放背景音乐";

std::string str6 = "背景音乐：加";

std::string str7 = "背景音乐：减";

GBKToUTF8(str1,"GB2312","UTF-8");

GBKToUTF8(str2,"GB2312","UTF-8");

GBKToUTF8(str3,"GB2312","UTF-8");

GBKToUTF8(str4,"GB2312","UTF-8");

GBKToUTF8(str5,"GB2312","UTF-8");

GBKToUTF8(str6,"GB2312","UTF-8");

GBKToUTF8(str7,"GB2312","UTF-8");

CCMenuItemFont::setFontSize(24);

CCMenuItemFont::setFontName("Arial");

CCMenuItemFont * menu1 = CCMenuItemFont::create(str1.c_str(),this,menu_selector(HelloWorld::menu));

menu1->setTag(1);

CCMenuItemFont * menu2 = CCMenuItemFont::create(str2.c_str(),this,menu_selector(HelloWorld::menu));

menu2->setTag(2);

CCMenuItemFont * menu3 = CCMenuItemFont::create(str3.c_str(),this,menu_selector(HelloWorld::menu));

menu3->setTag(3);

CCMenuItemFont * menu4 = CCMenuItemFont::create(str4.c_str(),this,menu_selector(HelloWorld::menu));

menu4->setTag(4);

CCMenuItemFont * menu5 = CCMenuItemFont::create(str5.c_str(),this,menu_selector(HelloWorld::menu));

menu5->setTag(5);

CCMenuItemFont * menu6 = CCMenuItemFont::create(str6.c_str(),this,menu_selector(HelloWorld::menu));

menu6->setTag(6);

CCMenuItemFont * menu7 = CCMenuItemFont::create(str7.c_str(),this,menu_selector(HelloWorld::menu));

menu7->setTag(7);

CCMenu * leftMenu = CCMenu::create(menu1,menu2,menu3,menu4,menu5,menu6,menu7,NULL);

leftMenu->alignItemsVerticallyWithPadding(5);

leftMenu->setPositionX(size.width/4);

this->addChild(leftMenu);

//以下是对音效的操作

std::string str11 = "播放音效";

std::string str12 = "停止音效";

std::string str13 = "暂停音效";

std::string str14 = "恢复音效";

std::string str15 = "从缓存中移除音效";

std::string str16 = "音效：加";

std::string str17 = "音效：减";

GBKToUTF8(str11,"GB2312","UTF-8");

GBKToUTF8(str12,"GB2312","UTF-8");

GBKToUTF8(str13,"GB2312","UTF-8");

GBKToUTF8(str14,"GB2312","UTF-8");

GBKToUTF8(str15,"GB2312","UTF-8");

GBKToUTF8(str16,"GB2312","UTF-8");

GBKToUTF8(str17,"GB2312","UTF-8");

CCMenuItemFont * menu11 = CCMenuItemFont::create(str11.c_str(),this,menu_selector(HelloWorld::menu));

menu11->setTag(11);

CCMenuItemFont * menu12 = CCMenuItemFont::create(str12.c_str(),this,menu_selector(HelloWorld::menu));

menu12->setTag(12);

CCMenuItemFont * menu13 = CCMenuItemFont::create(str13.c_str(),this,menu_selector(HelloWorld::menu));

menu13->setTag(13);

CCMenuItemFont * menu14 = CCMenuItemFont::create(str14.c_str(),this,menu_selector(HelloWorld::menu));

menu14->setTag(14);

CCMenuItemFont * menu15 = CCMenuItemFont::create(str15.c_str(),this,menu_selector(HelloWorld::menu));

menu15->setTag(15);

CCMenuItemFont * menu16 = CCMenuItemFont::create(str16.c_str(),this,menu_selector(HelloWorld::menu));

menu16->setTag(16);

CCMenuItemFont * menu17 = CCMenuItemFont::create(str17.c_str(),this,menu_selector(HelloWorld::menu));

menu17->setTag(17);

CCMenu * rightMenu = CCMenu::create(menu11,menu12,menu13,menu14,menu15,menu16,menu17,NULL);

rightMenu->alignItemsVerticallyWithPadding(5);

rightMenu->setPositionX(size.width*3/4);

this->addChild(rightMenu);

bRet = true;

} while (0);

return bRet;

}

void HelloWorld::menu(CCObject * sender)

{

CCNode * node = (CCNode *)sender;

int tag = node->getTag();

switch(tag)

{

case 1:

//播放声音，第二个参数代表是否循环播放

SimpleAudioEngine::sharedEngine()->playBackgroundMusic(

AudioPretreat::sharedAudioPretreat()->getMusic(MUSIC_TYPE_BACKGROUND),true);

break;

case 2:

SimpleAudioEngine::sharedEngine()->stopBackgroundMusic();

break;

case 3:

//pause和resume成对使用

SimpleAudioEngine::sharedEngine()->pauseBackgroundMusic();

break;

case 4:

SimpleAudioEngine::sharedEngine()->resumeBackgroundMusic();

break;

case 5:

SimpleAudioEngine::sharedEngine()->rewindBackgroundMusic();

break;

case 6:

//这个函数在win32上没法改变声音的大小，大家用f12跟进函数的时候里边是空，但是在android平台上有实现

SimpleAudioEngine::sharedEngine()->setBackgroundMusicVolume(

SimpleAudioEngine::sharedEngine()->getBackgroundMusicVolume()+0.1f);

break;

case 7:

//这个函数在win32上没法改变声音的大小，大家用f12跟进函数的时候里边是空，但是在android平台上有实现

SimpleAudioEngine::sharedEngine()->setBackgroundMusicVolume(

SimpleAudioEngine::sharedEngine()->getBackgroundMusicVolume()-0.1f);

break;

case 11:

//第二个参数设为true的话则循环播放,soundID是在HelloWorld的头文件中定义的

//音效函数不同于背景音乐的是会返回一个ID

soundID = SimpleAudioEngine::sharedEngine()->playEffect(

AudioPretreat::sharedAudioPretreat()->getEffect(EFFECT_TYPE_EFFECT1),true);

break;

case 12:

//音效函数大多会传入一个ID，因为游戏中的音效不止一个

SimpleAudioEngine::sharedEngine()->stopEffect(soundID);

break;

case 13:

SimpleAudioEngine::sharedEngine()->pauseEffect(soundID);

break;

case 14:

SimpleAudioEngine::sharedEngine()->resumeEffect(soundID);

case 15:

//从缓存中移除音效，需要传入移除的音效的名字

SimpleAudioEngine::sharedEngine()->unloadEffect(

AudioPretreat::sharedAudioPretreat()->getEffect(EFFECT_TYPE_EFFECT1));

case 16:

SimpleAudioEngine::sharedEngine()->setEffectsVolume(

SimpleAudioEngine::sharedEngine()->getEffectsVolume()+0.1);

break;

case 17:

SimpleAudioEngine::sharedEngine()->setEffectsVolume(

SimpleAudioEngine::sharedEngine()->getEffectsVolume()-0.1);

break;

}

//编码格式转化函数

int GBKToUTF8(std::string & gbkStr, const char* toCode, const char* fromCode)

{

iconv_t iconvH;

iconvH = iconv_open(fromCode, toCode);

if (iconvH == 0)

{

return -1;

}

const char* strChar = gbkStr.c_str();

const char** pin = &strChar;

size_t strLength = gbkStr.length();

char* outbuf = (char*) malloc(strLength*4);

char* pBuff = outbuf;

memset( outbuf, 0, strLength*4);

size_t outLength = strLength*4;

if (-1 == iconv(iconvH, pin, &strLength, &outbuf, &outLength))

{

iconv_close(iconvH);

return -1;

}

gbkStr = pBuff;

iconv_close(iconvH);

return 0;

}

Cocos2d-x中背景音乐和音效使用实例

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