axmol/CocosDenshion/qnx/SimpleAudioEngine.cpp

/****************************************************************************
Copyright (c) 2010 cocos2d-x.org

http://www.cocos2d-x.org

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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

#include <map>
#include <string>
#include <stdio.h>
#include <unistd.h>

#include <AL/al.h>
#include <AL/alc.h>
#include <AL/alut.h>
#include <sys/stat.h>
#include <vorbis/vorbisfile.h>

#include "SimpleAudioEngine.h"

using namespace std;

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;
    static bool  s_isBackgroundInitialized = false;
    static std::string s_currentBackgroundStr;

    ALuint s_backgroundBuffer;
    ALuint s_backgroundSource;

    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)
        {
            s_currentBackgroundStr = "";
            s_isBackgroundInitialized = false;

            alDeleteBuffers(1, &s_backgroundBuffer);
            checkALError("stopBackground");
            alDeleteSources(1, &s_backgroundSource);
            checkALError("stopBackground");
        }
    }

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

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

    SimpleAudioEngine::~SimpleAudioEngine()
    {
        alutExit();
    }

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

    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);
    }

    void SimpleAudioEngine::setResource(const char* pszZipFileName)
    {
    }

    //
    // OGG support
    //
    static bool isOGGFile(const char *pszFilePath)
    {
        FILE            *file;
        OggVorbis_File   ogg_file;
        int                 result;

        file = fopen(pszFilePath, "rb");
        result = ov_test(file, &ogg_file, 0, 0);
        ov_clear(&ogg_file);

        return (result == 0);
    }

    static ALuint createBufferFromOGG(const char *pszFilePath)
    {
        ALuint             buffer;
        OggVorbis_File  ogg_file;
        vorbis_info*    info;
        ALenum             format;
        int             result;
        int             section;
        int                err;
        unsigned int     size = 0;

        if (ov_fopen(pszFilePath, &ogg_file) < 0)
        {
            ov_clear(&ogg_file);
            fprintf(stderr, "Could not open OGG file %s\n", pszFilePath);
            return -1;
        }

        info = ov_info(&ogg_file, -1);

        if (info->channels == 1)
            format = AL_FORMAT_MONO16;
        else
            format = AL_FORMAT_STEREO16;

        // size = #samples * #channels * 2 (for 16 bit)
        unsigned int data_size = ov_pcm_total(&ogg_file, -1) * info->channels * 2;
        char* data = new char[data_size];

        while (size < data_size)
        {
            result = ov_read(&ogg_file, data + size, data_size - size, 0, 2, 1, &section);
            if (result > 0)
            {
                size += result;
            }
            else if (result < 0)
            {
                delete [] data;
                fprintf(stderr, "OGG file problem %s\n", pszFilePath);
                return -1;
            }
            else
            {
                break;
            }
        }

        if (size == 0)
        {
            delete [] data;
            fprintf(stderr, "Unable to read OGG data\n");
            return -1;
        }

        // clear al errors
        checkALError("createBufferFromOGG");

        // Load audio data into a buffer.
        alGenBuffers(1, &buffer);

        if (checkALError("createBufferFromOGG") != AL_NO_ERROR)
        {
            fprintf(stderr, "Couldn't generate a buffer for OGG file\n");
            delete [] data;
            return buffer;
        }

        alBufferData(buffer, format, data, data_size, info->rate);
        checkALError("createBufferFromOGG");

        delete [] data;
        ov_clear(&ogg_file);

        return buffer;
    }


    //
    // background audio
    //
    void SimpleAudioEngine::preloadBackgroundMusic(const char* pszFilePath)
    {
        if (!s_isBackgroundInitialized || s_currentBackgroundStr != pszFilePath)
        {
            string path = pszFilePath;

            if (isOGGFile(path.data()))
            {
                s_backgroundBuffer = createBufferFromOGG(path.data());
            }
            else
            {
                s_backgroundBuffer = alutCreateBufferFromFile(path.data());
            }

            checkALError("preloadBackgroundMusic");

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

            alGenSources(1, &s_backgroundSource);
            checkALError("preloadBackgroundMusic");

            alSourcei(s_backgroundSource, AL_BUFFER, s_backgroundBuffer);
            checkALError("preloadBackgroundMusic");

            s_currentBackgroundStr = pszFilePath;
        }

        s_currentBackgroundStr       = pszFilePath;
        s_isBackgroundInitialized = true;
    }

    void SimpleAudioEngine::playBackgroundMusic(const char* pszFilePath, bool bLoop)
    {
        if (!s_isBackgroundInitialized)
            preloadBackgroundMusic(pszFilePath);

        alSourcei(s_backgroundSource, AL_LOOPING, bLoop ? AL_TRUE : AL_FALSE);
        alSourcePlay(s_backgroundSource);
        checkALError("playBackgroundMusic");
    }

    void SimpleAudioEngine::stopBackgroundMusic(bool bReleaseData)
    {
        stopBackground(bReleaseData);
    }

    void SimpleAudioEngine::pauseBackgroundMusic()
    {
        alSourcePause(s_backgroundSource);
        checkALError("pauseBackgroundMusic");
    }

    void SimpleAudioEngine::resumeBackgroundMusic()
    {
        alSourcePlay(s_backgroundSource);
        checkALError("resumeBackgroundMusic");
    } 

    void SimpleAudioEngine::rewindBackgroundMusic()
    {
        alSourceRewind(s_backgroundSource);
        checkALError("rewindBackgroundMusic");
    }

    bool SimpleAudioEngine::willPlayBackgroundMusic()
    {
        return true;
    }

    bool SimpleAudioEngine::isBackgroundMusicPlaying()
    {
        ALint play_status;
        alGetSourcei(s_backgroundSource, AL_SOURCE_STATE, &play_status);

        return (play_status == AL_PLAYING);
    }

    float SimpleAudioEngine::getBackgroundMusicVolume()
    {
        return s_volume;
    }

    void SimpleAudioEngine::setBackgroundMusicVolume(float volume)
    {
        if (s_volume != volume && volume >= -0.0001 && volume <= 1.0001)
        {
            s_volume = volume;

            setBackgroundVolume(volume);
        }
    }

    //
    // Effect audio (using OpenAL)
    //
    float SimpleAudioEngine::getEffectsVolume()
    {
        return s_effectVolume;
    }

    void SimpleAudioEngine::setEffectsVolume(float volume)
    {
        if (volume != s_effectVolume)
        {
            EffectsMap::const_iterator end = s_effects.end();
            for (EffectsMap::const_iterator it = s_effects.begin(); it != end; it++)
            {
                alSourcef(it->second->source, AL_GAIN, volume);
            }

            s_effectVolume = volume;
        }
    }

    unsigned int SimpleAudioEngine::playEffect(const char* pszFilePath, bool bLoop)
    {
        EffectsMap::iterator iter = s_effects.find(pszFilePath);

        if (iter == s_effects.end())
        {
            preloadEffect(pszFilePath);

            // let's try again
            iter = s_effects.find(pszFilePath);
            if (iter == s_effects.end())
            {
                fprintf(stderr, "could not find play sound %s\n", pszFilePath);
                return -1;
            }
        }

        checkALError("playEffect");
        iter->second->isLooped = bLoop;
        alSourcei(iter->second->source, AL_LOOPING, iter->second->isLooped ? AL_TRUE : AL_FALSE);
        alSourcePlay(iter->second->source);
        checkALError("playEffect");

        return iter->second->source;
    }

    void SimpleAudioEngine::stopEffect(unsigned int nSoundId)
    {
        alSourceStop(nSoundId);
        checkALError("stopEffect");
    }

    void SimpleAudioEngine::preloadEffect(const char* pszFilePath)
    {
        EffectsMap::iterator iter = s_effects.find(pszFilePath);

        // check if we have this already
        if (iter == s_effects.end())
        {
            ALuint         buffer;
            ALuint         source;
            soundData  *data = new soundData;
            string         path = pszFilePath;

            checkALError("preloadEffect");

            if (isOGGFile(path.data()))
            {
                buffer = createBufferFromOGG(path.data());
            }
            else
            {
                buffer = alutCreateBufferFromFile(path.data());
                checkALError("preloadEffect");
            }

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

            alGenSources(1, &source);

            if (checkALError("preloadEffect") != AL_NO_ERROR)
            {
                alDeleteBuffers(1, &buffer);
                return;
            }

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

            data->isLooped = false;
            data->buffer = buffer;
            data->source = source;

            s_effects.insert(EffectsMap::value_type(pszFilePath, data));
        }
    }

    void SimpleAudioEngine::unloadEffect(const char* pszFilePath)
    {
        EffectsMap::iterator iter = s_effects.find(pszFilePath);

        if (iter != s_effects.end())
        {
            checkALError("unloadEffect");

            alSourceStop(iter->second->source);
            checkALError("unloadEffect");

            alDeleteSources(1, &iter->second->source);
            checkALError("unloadEffect");

            alDeleteBuffers(1, &iter->second->buffer);
            checkALError("unloadEffect");
            delete iter->second;

            s_effects.erase(iter);
        }
    }

    void SimpleAudioEngine::pauseEffect(unsigned int nSoundId)
    {
        alSourcePause(nSoundId);
        checkALError("pauseEffect");
    }

    void SimpleAudioEngine::pauseAllEffects()
    {
        EffectsMap::iterator iter = s_effects.begin();

        if (iter != s_effects.end())
        {
            alSourcePause(iter->second->source);
            checkALError("pauseAllEffects");
        }
    }

    void SimpleAudioEngine::resumeEffect(unsigned int nSoundId)
    {
        alSourcePlay(nSoundId);
        checkALError("resumeEffect");
    }

    void SimpleAudioEngine::resumeAllEffects()
    {
        EffectsMap::iterator iter = s_effects.begin();

        if (iter != s_effects.end())
        {
            checkALError("resumeAllEffects");
            alSourcePlay(iter->second->source);
            checkALError("resumeAllEffects");
        }
    }

    void SimpleAudioEngine::stopAllEffects()
    {
        EffectsMap::iterator iter = s_effects.begin();

        if (iter != s_effects.end())
        {
            checkALError("stopAllEffects");
            alSourceStop(iter->second->source);
            checkALError("stopAllEffects");
        }
    }

}