C++ BackgroundMusicsMap类代码示例

void SimpleAudioEngine::playBackgroundMusic(const char* pszFilePath, bool bLoop)
{
    // If there is already a background music source we stop it first
    if (s_backgroundSource != AL_NONE)
        stopBackgroundMusic(false);

    // Changing file path to full path
    std::string fullPath = FileUtils::getInstance()->fullPathForFilename(pszFilePath);

    BackgroundMusicsMap::const_iterator it = s_backgroundMusics.find(fullPath);
    if (it == s_backgroundMusics.end())
    {
        preloadBackgroundMusic(fullPath.c_str());
        it = s_backgroundMusics.find(fullPath);
    }

    if (it != s_backgroundMusics.end())
    {
        s_backgroundSource = it->second->source;
        alSourcei(s_backgroundSource, AL_LOOPING, bLoop ? AL_TRUE : AL_FALSE);
        setBackgroundVolume(s_volume);
        alSourcePlay(s_backgroundSource);
        checkALError("playBackgroundMusic:alSourcePlay");
    }
}

	void SimpleAudioEngine::end()
	{
		checkALError("end");

		// clear all the sounds
	    EffectsMap::const_iterator end = s_effects.end();
	    for (EffectsMap::iterator it = s_effects.begin(); it != end; it++)
	    {
	        alSourceStop(it->second->source);
	        checkALError("end");
			alDeleteBuffers(1, &it->second->buffer);
			checkALError("end");
			alDeleteSources(1, &it->second->source);
			checkALError("end");
			delete it->second;
	    }
	    s_effects.clear();

		// and the background too
		stopBackground(true);

		for (BackgroundMusicsMap::iterator it = s_backgroundMusics.begin(); it != s_backgroundMusics.end(); ++it)
		{
			alSourceStop(it->second->source);
			checkALError("end");
			alDeleteBuffers(1, &it->second->buffer);
			checkALError("end");
			alDeleteSources(1, &it->second->source);
			checkALError("end");
			delete it->second;
		}
		s_backgroundMusics.clear();
	}

	void SimpleAudioEngine::end()
	{
		// clear all the sounds
	    EffectsMap::const_iterator end = s_effects.end();
	    for (EffectsMap::iterator it = s_effects.begin(); it != end; it++)
	    {
            Mix_FreeChunk(it->second->chunk);
			delete it->second;
	    }
	    s_effects.clear();

		// and the background too
		stopBackground(true);

		for (BackgroundMusicsMap::iterator it = s_backgroundMusics.begin(); it != s_backgroundMusics.end(); ++it)
		{
            Mix_FreeMusic(it->second->music);
			delete it->second;
		}
		s_backgroundMusics.clear();
	}

	//
	// background audio
	//
    void SimpleAudioEngine::preloadBackgroundMusic(const char* pszFilePath)
	{
		// Changing file path to full path
    	std::string fullPath = CCFileUtils::sharedFileUtils()->fullPathForFilename(pszFilePath);

    	BackgroundMusicsMap::const_iterator it = s_backgroundMusics.find(fullPath);
		if (it == s_backgroundMusics.end())
		{
			ALuint buffer = AL_NONE;
			if (isOGGFile(fullPath.data()))
			{
				buffer = createBufferFromOGG(fullPath.data());
			}
			else
			{
				buffer = alutCreateBufferFromFile(fullPath.data());
			}

			checkALError("preloadBackgroundMusic");

			if (buffer == AL_NONE)
			{
				fprintf(stderr, "Error loading file: '%s'\n", fullPath.data());
				alDeleteBuffers(1, &buffer);
				return;
			}

			ALuint source = AL_NONE;
			alGenSources(1, &source);
			checkALError("preloadBackgroundMusic");

			alSourcei(source, AL_BUFFER, buffer);
			checkALError("preloadBackgroundMusic");

			backgroundMusicData* data = new backgroundMusicData();
			data->buffer = buffer;
			data->source = source;
			s_backgroundMusics.insert(BackgroundMusicsMap::value_type(fullPath, data));
		}
	}

	void SimpleAudioEngine::playBackgroundMusic(const char* pszFilePath, bool bLoop)
	{
		if (s_backgroundSource != AL_NONE)
			stopBackgroundMusic(false);

		// Changing file path to full path
    	std::string fullPath = CCFileUtils::sharedFileUtils()->fullPathForFilename(pszFilePath);

    	BackgroundMusicsMap::const_iterator it = s_backgroundMusics.find(fullPath);
		if (it == s_backgroundMusics.end())
		{
			preloadBackgroundMusic(fullPath.c_str());
			it = s_backgroundMusics.find(fullPath);
		}

		if (it != s_backgroundMusics.end())
		{
			s_backgroundSource = it->second->source;
			alSourcei(s_backgroundSource, AL_LOOPING, bLoop ? AL_TRUE : AL_FALSE);
			alSourcePlay(s_backgroundSource);
			checkALError("playBackgroundMusic");
		}
	}

    static void stopBackground(bool bReleaseData)
    {
		alSourceStop(s_backgroundSource);

		if (bReleaseData)
		{
			for (BackgroundMusicsMap::iterator it = s_backgroundMusics.begin(); it != s_backgroundMusics.end(); ++it)
			{
				if (it->second->source == s_backgroundSource)
				{
					alDeleteBuffers(1, &it->second->buffer);
					checkALError("stopBackground");
					alDeleteSources(1, &it->second->source);
					checkALError("stopBackground");
					delete it->second;
					s_backgroundMusics.erase(it);
					break;
				}
			}
		}

		s_backgroundSource = AL_NONE;
    }

//
// background audio
//
void SimpleAudioEngine::preloadBackgroundMusic(const char* pszFilePath)
{
    // Changing file path to full path
    std::string fullPath = FileUtils::getInstance()->fullPathForFilename(pszFilePath);

    BackgroundMusicsMap::const_iterator it = s_backgroundMusics.find(fullPath);
    if (it == s_backgroundMusics.end())
    {
        ALuint buffer = AL_NONE;
        bool success = false;
        OpenALFile file;
        file.debugName = pszFilePath;
        file.file = fopen(fullPath.c_str(), "rb");
        if (!file.file) {
            fprintf(stderr, "Cannot read file: '%s'\n", fullPath.data());
            return;
        }

        const std::vector<OpenALDecoder *> &decoders = OpenALDecoder::getDecoders();
        for (size_t i = 0, n = decoders.size(); !success && i < n; ++i)
            success = decoders[i]->decode(file, buffer);
        file.clear();

        ALuint source = AL_NONE;
        alGenSources(1, &source);
        checkALError("preloadBackgroundMusic:alGenSources");

        alSourcei(source, AL_BUFFER, buffer);
        checkALError("preloadBackgroundMusic:alSourcei");

        backgroundMusicData* data = new backgroundMusicData();
        data->buffer = buffer;
        data->source = source;
        s_backgroundMusics.insert(BackgroundMusicsMap::value_type(fullPath, data));
    }
}

namespace CocosDenshion {

struct soundData {
    ALuint buffer;
    ALuint source;
    bool   isLooped;
    float pitch;
    float pan;
    float gain;
};

typedef map<string, soundData *> EffectsMap;
EffectsMap s_effects;

typedef enum {
    PLAYING,
    STOPPED,
    PAUSED,
} playStatus;

static float s_volume                  = 1.0f;
static float s_effectVolume            = 1.0f;

struct backgroundMusicData {
    ALuint buffer;
    ALuint source;
};

typedef map<string, backgroundMusicData *> BackgroundMusicsMap;
BackgroundMusicsMap s_backgroundMusics;

static ALuint s_backgroundSource = AL_NONE;

static SimpleAudioEngine  *s_engine = nullptr;

static int checkALError(const char *funcName)
{
    int err = alGetError();

    if (err != AL_NO_ERROR)
    {
        switch (err)
        {
            case AL_INVALID_NAME:
                fprintf(stderr, "AL_INVALID_NAME in %s\n", funcName);
                break;

            case AL_INVALID_ENUM:
                fprintf(stderr, "AL_INVALID_ENUM in %s\n", funcName);
                break;

            case AL_INVALID_VALUE:
                fprintf(stderr, "AL_INVALID_VALUE in %s\n", funcName);
                break;

            case AL_INVALID_OPERATION:
                fprintf(stderr, "AL_INVALID_OPERATION in %s\n", funcName);
                break;

            case AL_OUT_OF_MEMORY:
                fprintf(stderr, "AL_OUT_OF_MEMORY in %s\n", funcName);
                break;
        }
    }

    return err;
}

static void stopBackground(bool bReleaseData)
{
    // The background music might have been already stopped
    // Stop request can come from
    //   - stopBackgroundMusic(..)
    //   - end(..)
    if (s_backgroundSource != AL_NONE)
        alSourceStop(s_backgroundSource);

    if (bReleaseData)
    {
        for (auto it = s_backgroundMusics.begin(); it != s_backgroundMusics.end(); ++it)
        {
            if (it->second->source == s_backgroundSource)
            {
                alDeleteSources(1, &it->second->source);
                checkALError("stopBackground:alDeleteSources");
                alDeleteBuffers(1, &it->second->buffer);
                checkALError("stopBackground:alDeleteBuffers");
                delete it->second;
                s_backgroundMusics.erase(it);
                break;
            }
        }
    }

    s_backgroundSource = AL_NONE;
}

static void setBackgroundVolume(float volume)
{
    alSourcef(s_backgroundSource, AL_GAIN, volume);
//.........这里部分代码省略.........

namespace CocosDenshion
{
	struct soundData {
        Mix_Chunk *chunk;
		bool   isLooped;
	};

	typedef map<string, soundData *> EffectsMap;
	EffectsMap s_effects;
    float s_effectsVolume = 1.0;

	typedef enum {
		PLAYING,
		STOPPED,
		PAUSED,
	} playStatus;

	struct backgroundMusicData {
		Mix_Music *music;
	};
	typedef map<string, backgroundMusicData *> BackgroundMusicsMap;
	BackgroundMusicsMap s_backgroundMusics;
    float s_backgroundVolume = 1.0;

	static SimpleAudioEngine  *s_engine = 0;

    // Unfortunately this is just hard-coded in Emscripten's SDL
    // implementation.
    static const int NR_CHANNELS = 32;
    static void stopBackground(bool bReleaseData)
    {
        SimpleAudioEngine *engine = SimpleAudioEngine::getInstance();
        engine->stopBackgroundMusic();
    }

	SimpleAudioEngine::SimpleAudioEngine()
	{
	}

	SimpleAudioEngine::~SimpleAudioEngine()
	{
	}

	SimpleAudioEngine* SimpleAudioEngine::getInstance()
	{
		if (!s_engine)
			s_engine = new SimpleAudioEngine();
        
		return s_engine;
	}

	void SimpleAudioEngine::end()
	{
		// clear all the sounds
	    EffectsMap::const_iterator end = s_effects.end();
	    for (EffectsMap::iterator it = s_effects.begin(); it != end; it++)
	    {
            Mix_FreeChunk(it->second->chunk);
			delete it->second;
	    }
	    s_effects.clear();

		// and the background too
		stopBackground(true);

		for (BackgroundMusicsMap::iterator it = s_backgroundMusics.begin(); it != s_backgroundMusics.end(); ++it)
		{
            Mix_FreeMusic(it->second->music);
			delete it->second;
		}
		s_backgroundMusics.clear();
	}

	//
	// background audio
	//
    void SimpleAudioEngine::preloadBackgroundMusic(const char* pszFilePath)
	{
	}

	void SimpleAudioEngine::playBackgroundMusic(const char* pszFilePath, bool bLoop)
	{
        std::string key = std::string(pszFilePath);
        struct backgroundMusicData *musicData;
        if(!s_backgroundMusics.count(key))
        {
            musicData = new struct backgroundMusicData();
            musicData->music = Mix_LoadMUS(pszFilePath);
            s_backgroundMusics[key] = musicData;
        }
        else
        {
            musicData = s_backgroundMusics[key];
        }

        Mix_PlayMusic(musicData->music, bLoop ? -1 : 0);
	}

	void SimpleAudioEngine::stopBackgroundMusic(bool bReleaseData)
	{
//.........这里部分代码省略.........

namespace CocosDenshion
{
	struct soundData {
		ALuint buffer;
		ALuint source;
		bool   isLooped;
	};

	typedef map<string, soundData *> EffectsMap;
	EffectsMap s_effects;

	typedef enum {
		PLAYING,
		STOPPED,
		PAUSED,
	} playStatus;

	static float s_volume 				   = 1.0f;
	static float s_effectVolume			   = 1.0f;

	struct backgroundMusicData {
		ALuint buffer;
		ALuint source;
	};
	typedef map<string, backgroundMusicData *> BackgroundMusicsMap;
	BackgroundMusicsMap s_backgroundMusics;

	static ALuint s_backgroundSource = AL_NONE;

	static SimpleAudioEngine  *s_engine = 0;

	static int checkALError(const char *funcName)
	{
		int err = alGetError();

		if (err != AL_NO_ERROR)
		{
			switch (err)
			{
				case AL_INVALID_NAME:
					fprintf(stderr, "AL_INVALID_NAME in %s\n", funcName);
					break;

				case AL_INVALID_ENUM:
					fprintf(stderr, "AL_INVALID_ENUM in %s\n", funcName);
					break;

				case AL_INVALID_VALUE:
					fprintf(stderr, "AL_INVALID_VALUE in %s\n", funcName);
					break;

				case AL_INVALID_OPERATION:
					fprintf(stderr, "AL_INVALID_OPERATION in %s\n", funcName);
					break;

				case AL_OUT_OF_MEMORY:
					fprintf(stderr, "AL_OUT_OF_MEMORY in %s\n", funcName);
					break;
			}
		}

		return err;
	}

    static void stopBackground(bool bReleaseData)
    {
		alSourceStop(s_backgroundSource);

		if (bReleaseData)
		{
			for (BackgroundMusicsMap::iterator it = s_backgroundMusics.begin(); it != s_backgroundMusics.end(); ++it)
			{
				if (it->second->source == s_backgroundSource)
				{
					alDeleteBuffers(1, &it->second->buffer);
					checkALError("stopBackground");
					alDeleteSources(1, &it->second->source);
					checkALError("stopBackground");
					delete it->second;
					s_backgroundMusics.erase(it);
					break;
				}
			}
		}

		s_backgroundSource = AL_NONE;
    }

    static void setBackgroundVolume(float volume)
    {
    	alSourcef(s_backgroundSource, AL_GAIN, volume);
    }

	SimpleAudioEngine::SimpleAudioEngine()
	{
		alutInit(0, 0);
	}

	SimpleAudioEngine::~SimpleAudioEngine()
	{
//.........这里部分代码省略.........

static void stopBackground(bool bReleaseData)
{
    // The background music might have been already stopped
    // Stop request can come from
    //   - stopBackgroundMusic(..)
    //   - end(..)
    if (s_backgroundSource != AL_NONE)
        alSourceStop(s_backgroundSource);

    if (bReleaseData)
    {
        for (auto it = s_backgroundMusics.begin(); it != s_backgroundMusics.end(); ++it)
        {
            if (it->second->source == s_backgroundSource)
            {
                alDeleteSources(1, &it->second->source);
                checkALError("stopBackground:alDeleteSources");
                alDeleteBuffers(1, &it->second->buffer);
                checkALError("stopBackground:alDeleteBuffers");
                delete it->second;
                s_backgroundMusics.erase(it);
                break;
            }
        }
    }

    s_backgroundSource = AL_NONE;
}

void SimpleAudioEngine::end()
{
    checkALError("end:init");

    // clear all the sound effects
    EffectsMap::const_iterator end = s_effects.end();
    for (auto it = s_effects.begin(); it != end; ++it)
    {
        alSourceStop(it->second->source);
        checkALError("end:alSourceStop");

        alDeleteSources(1, &it->second->source);
        checkALError("end:alDeleteSources");

        alDeleteBuffers(1, &it->second->buffer);
        checkALError("end:alDeleteBuffers");

        delete it->second;
    }
    s_effects.clear();

    // and the background music too
    stopBackground(true);

    for (auto it = s_backgroundMusics.begin(); it != s_backgroundMusics.end(); ++it)
    {
        alSourceStop(it->second->source);
        checkALError("end:alSourceStop");

        alDeleteSources(1, &it->second->source);
        checkALError("end:alDeleteSources");

        alDeleteBuffers(1, &it->second->buffer);
        checkALError("end:alDeleteBuffers");

        delete it->second;
    }
    s_backgroundMusics.clear();

    CC_SAFE_DELETE(s_engine);
}

	void SimpleAudioEngine::playBackgroundMusic(const char* pszFilePath, bool bLoop)
	{
        std::string key = std::string(pszFilePath);
        struct backgroundMusicData *musicData;
        if(!s_backgroundMusics.count(key))
        {
            musicData = new struct backgroundMusicData();
            musicData->music = Mix_LoadMUS(pszFilePath);
            s_backgroundMusics[key] = musicData;
        }
        else
        {
            musicData = s_backgroundMusics[key];
        }

        Mix_PlayMusic(musicData->music, bLoop ? -1 : 0);
	}