* Copyright (c) 2009 Vittorio Giovara <vittorio.giovara@gmail.com>

char oalbReady = 0;

int iNumSounds = 0;

/*Sources are points emitting sound*/

ALuint Sources[MAX_SOURCES];

/*structure that holds information about sounds*/

SSound_t *theSounds;

ALfloat SourcePos[] = { 0.0, 0.0, 0.0 }; /*Position of the source sound*/

ALfloat SourceVel[] = { 0.0, 0.0, 0.0 }; /*Velocity of the source sound*/

const char oalb_init (const char* programname, const char usehardware) {	

        /*Initialize an OpenAL contex and allocate memory space for data and buffers*/

        ALCcontext *context;

        ALCdevice *device;

        const ALCchar *default_device;

        int i;

        /*Position of the listener*/

        ALfloat ListenerPos[] = {0.0, 0.0, 0.0};

        /*Velocity of the listener*/

        ALfloat ListenerVel[] = {0.0, 0.0, 0.0};

        /*Orientation of the listener. (first 3 elements are "at", second 3 are "up")*/

        ALfloat ListenerOri[] = {0.0, 0.0, -1.0, 0.0, 1.0, 0.0};

        if (oalbReady == 1) {

        err_msg("(%s) INFO - Output device: %s", prog, alcGetString(device, ALC_DEVICE_SPECIFIER));

        alcProcessContext(context);

        if (AlGetError("(%s) ERROR - Failed to create a new contex") != AL_TRUE)

        alListenerf (AL_GAIN,        1.0f       );

        alListenerfv(AL_POSITION,    ListenerPos);

        alListenerfv(AL_VELOCITY,    ListenerVel);

        alListenerfv(AL_ORIENTATION, ListenerOri);

        theSounds = (SSound_t*) Malloc(sizeof(SSound_t)*MAX_SOUNDS);

        for (i = 0; i < MAX_SOUNDS; i++) {

                theSounds->isLoaded = 0;

                theSounds->sourceIndex = -1;

        }

        alGenSources(MAX_SOURCES, Sources);

        oalbReady = 1;

        /*Stop all sounds, deallocate all memory and close OpenAL */

        ALCcontext *context;

        ALCdevice  *device;

        alSourceStopv	(MAX_SOURCES, Sources);

        alDeleteSources (MAX_SOURCES, Sources);

        for (i = 0; i < MAX_SOUNDS; i++) {

                free(theSounds[i].filename);

                alDeleteBuffers (1, &theSounds[i].Buffer);

        free(theSounds);

        context = alcGetCurrentContext();

        device  = alcGetContextsDevice(context);

/*

 ALboolean helper_realloc (void) {

 expands allocated memory when loading more sound files than expected

 int oldsize = globalsize;

 globalsize += increment;

 #ifdef DEBUG

 err_msg("(%s) INFO - Realloc in process from %d to %d\n", prog, oldsize, globalsize);

 #endif

 Buffers = (ALuint*) Realloc(Buffers, sizeof(ALuint)*globalsize);

 Sources = (ALuint*) Realloc(Sources, sizeof(ALuint)*globalsize);

 return AL_TRUE;

 }*/

const int32_t oalb_loadfile (const char *filename){

        /*Open a file, load into memory and allocate the Source buffer for playing*/

        ALenum format, error;

        ALsizei bitsize, freq;

        char *data;

        int namelength, i;

        uint32_t magic;

        FILE *fp;

        /*when the buffers are all used, we can expand memory to accept new files*/

        //     if (globalindex == globalsize)

        //            helper_realloc();

        namelength=strlen(filename);

        /*if this sound is already loaded return the index from theSounds*/

        for (i = 0; i < iNumSounds; i++){

                if (theSounds[iNumSounds].isLoaded == 1) {

                        if (strncmp(theSounds[iNumSounds].filename, filename, namelength) == 0)

                                return i;

                }

        }

        /*else load it and store it into a theSounds cell*/

        /*detect the file format, as written in the first 4 bytes of the header*/

        fp = Fopen (filename, "rb");

        if (fp == NULL)

                return -1;

        error = fread (&magic, sizeof(uint32_t), 1, fp);

        fclose (fp);

        if (error < 0) {

                errno = EIO;

                err_ret("(%s) ERROR - File %s is too short", prog, filename);

                return -2;

        switch (ENDIAN_BIG_32(magic)) {

                case OGG_FILE_FORMAT:

                        error = load_oggvorbis (filename, &format, &data, &bitsize, &freq);

                        break;

                case WAV_FILE_FORMAT:

                        error = load_wavpcm (filename, &format, &data, &bitsize, &freq);

                        break;

                default:

                        errno = EINVAL;

                        err_ret ("(%s) ERROR - File format (%08X) not supported", prog, ENDIAN_BIG_32(magic));

                        return -5;

                        break;

        }

        theSounds[iNumSounds].filename = (char*) Malloc(sizeof(char) * namelength);

        strncpy(theSounds[iNumSounds].filename, filename, namelength);

        theSounds[iNumSounds].isLoaded = 1;

        /*prepare the buffer to receive data*/

        alGenBuffers(1, &theSounds[iNumSounds].Buffer);

        if (AlGetError("(%s) ERROR - Failed to allocate memory for buffers") != AL_TRUE)

                return -3;

        /*copy pcm data in one buffer*/

        alBufferData(theSounds[iNumSounds].Buffer, format, data, bitsize, freq);

        /*deallocate data to save memory*/

        free(data);		

        if (AlGetError("(%s) ERROR - Failed to write data to buffers") != AL_TRUE)

                return -6;

        alGetError();  /* clear any AL errors beforehand */

        /*returns the index of the source you just loaded, increments it and exits*/

        return iNumSounds++;

        float percentage;

                percentage = 1.0f;

                percentage = cPercentage / 100.0f;

        alSourcef(Sources[theSounds[iIndex].sourceIndex], AL_GAIN, percentage);

void oalb_fade (uint32_t iIndex, uint16_t quantity, ALboolean direction) {

        /*Fade in or out by calling a helper thread*/

#ifndef _WIN32

        pthread_t thread;

#else

        HANDLE Thread;

        DWORD threadID;

#endif

        fade_t *fade;

        if (oalbReady == 0) {

                errno = EPERM;                

                err_ret("(%s) WARN - OpenAL not initialized", prog);

                return ;

        }

        fade = (fade_t*) Malloc(sizeof(fade_t));

        fade->index = iIndex;

        fade->quantity = quantity;

        if(iIndex < 0 || iIndex >= iNumSounds) {

                errno = EINVAL;

                err_ret("(%s) ERROR - Index (%d) out of bounds", prog, iIndex);

                return;

        }

        switch (direction) {

                case FADE_IN:

#ifndef _WIN32

                        pthread_create(&thread, NULL, helper_fadein, (void*) fade);

#else

                        Thread = _beginthread(&helper_fadein, 0, (void*) fade);

#endif

                        break;

                case FADE_OUT:

#ifndef _WIN32

                        pthread_create(&thread, NULL, helper_fadeout, (void*) fade);

#else

                        Thread = _beginthread(&helper_fadeout, 0, (void*) fade);

#endif	

                        break;

                default:

                        errno = EINVAL;

                        err_ret("(%s) ERROR - Unknown direction for fading", prog, index);

                        free(fade);

                        return;

                        break;

        }

#ifndef _WIN32

        pthread_detach(thread);

#endif

        alGetError();  /* clear any AL errors beforehand */

        return;

}

void oalb_fadeout (uint32_t index, uint16_t quantity) {

        /*wrapper for fadeout*/

        oalb_fade(index, quantity, FADE_OUT);

        return;

}

void oalb_fadein (uint32_t index, uint16_t quantity) {

        /*wrapper for fadein*/

        oalb_fade(index, quantity, FADE_IN);

        return;

}

/*      ALboolean openal_setposition (uint32_t index, float x, float y, float z) {

 if (openalReady == AL_FALSE) {

 }*/

void oalb_playsound (const uint32_t iIndex, const char bLoop){

        int findNewSource;

        int i, j, state;

        if (oalbReady == 0) {

        /*check if sound has already a source*/

        if (theSounds[iIndex].sourceIndex == -1) {

                /*needs a new source*/

                findNewSource = 1;

        } else {