/*

     File: MusicCubePlayback.m

 Abstract: Defines the audio playback object for the application. The object responds to the OpenAL environment.

  Version: 1.3

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#import "MusicCubePlayback.h"

#import "MyOpenALSupport.h"

#import <AVFoundation/AVAudioSession.h>

@implementation MusicCubePlayback

@synthesize isPlaying = _isPlaying;

@synthesize wasInterrupted = _wasInterrupted;

@synthesize listenerRotation = _listenerRotation;

#pragma mark Object Init / Maintenance

- (void)handleInterruption:(NSNotification *)notification

{

    AVAudioSessionInterruptionType interruptionType = [[[notification userInfo]

                                                        objectForKey:AVAudioSessionInterruptionTypeKey] unsignedIntegerValue];

    if (AVAudioSessionInterruptionTypeBegan == interruptionType)

    {

        // do nothing

        [self teardownOpenAL];

        if (_isPlaying) {

            _wasInterrupted = YES;

            _isPlaying = NO;

        }

    }

    else if (AVAudioSessionInterruptionTypeEnded == interruptionType)

    {

        NSError *error = nil;

        [[AVAudioSession sharedInstance] setActive:YES error:&error];

        if (nil != error) NSLog(@"Error setting audio session active! %@", error);

        [self initOpenAL];

        if (_wasInterrupted)

        {

            [self startSound];

            _wasInterrupted = NO;

        }

    }

}

- (id)init

{   

    if (self = [super init]) {

        // initial position of the sound source and 

        // initial position and rotation of the listener

        // will be set by the view

        // setup our audio session

        AVAudioSession *sessionInstance = [AVAudioSession sharedInstance];

        // add interruption handler

        [[NSNotificationCenter defaultCenter] addObserver:self

                                                 selector:@selector(handleInterruption:)

                                                     name:AVAudioSessionInterruptionNotification

                                                    object:sessionInstance];

        NSError *error = nil;

        [sessionInstance setCategory:AVAudioSessionCategoryAmbient error:&error];

        if(nil != error) NSLog(@"Error setting audio session category! %@", error);

        else {

            [sessionInstance setActive:YES error:&error];

            if (nil != error) NSLog(@"Error setting audio session active! %@", error);

        }

        _wasInterrupted = NO;

        // Initialize our OpenAL environment

        [self initOpenAL];

    }

    return self;

}

- (void)dealloc

{

    if (_data) free(_data);

    [self teardownOpenAL];

    [super dealloc];

}

#pragma mark OpenAL

- (void) initBuffer

{

    ALenum  error = AL_NO_ERROR;

    ALenum  format = 0;

    ALsizei size = 0;

    ALsizei freq = 0;

    NSBundle*               bundle = [NSBundle mainBundle];

    // get some audio data from a wave file

    CFURLRef fileURL = (CFURLRef)[[NSURL fileURLWithPath:[bundle pathForResource:@"sound" ofType:@"wav"]] retain];

    if (fileURL)

    {   

        _data = MyGetOpenALAudioData(fileURL, &size, &format, &freq);

        CFRelease(fileURL);

        if((error = alGetError()) != AL_NO_ERROR) {

            printf("error loading sound: %x\n", error);

            exit(1);

        }

        // use the static buffer data API

        alBufferDataStaticProc(_buffer, format, _data, size, freq);

        if((error = alGetError()) != AL_NO_ERROR) {

            printf("error attaching audio to buffer: %x\n", error);

        }       

    }

    else

    {

        printf("Could not find file!\n");

        _data = NULL;

    }

}

- (void) initSource

{

    ALenum error = AL_NO_ERROR;

    alGetError(); // Clear the error

    // Turn Looping ON

    alSourcei(_source, AL_LOOPING, AL_TRUE);

    // Set Source Position

    alSourcefv(_source, AL_POSITION, _sourcePos);

    // Set Source Reference Distance

    alSourcef(_source, AL_REFERENCE_DISTANCE, 0.15f);

    // attach OpenAL Buffer to OpenAL Source

    alSourcei(_source, AL_BUFFER, _buffer);

    if((error = alGetError()) != AL_NO_ERROR) {

        printf("Error attaching buffer to source: %x\n", error);

        exit(1);

    }   

}

- (void)initOpenAL

{

    ALenum          error;

    ALCcontext      *newContext = NULL;

    ALCdevice       *newDevice = NULL;

    // Create a new OpenAL Device

    // Pass NULL to specify the system’s default output device

    newDevice = alcOpenDevice(NULL);

    if (newDevice != NULL)

    {

        // Create a new OpenAL Context

        // The new context will render to the OpenAL Device just created 

        newContext = alcCreateContext(newDevice, 0);

        if (newContext != NULL)

        {

            // Make the new context the Current OpenAL Context

            alcMakeContextCurrent(newContext);

            // Create some OpenAL Buffer Objects

            alGenBuffers(1, &_buffer);

            if((error = alGetError()) != AL_NO_ERROR) {

                printf("Error Generating Buffers: %x", error);

                exit(1);

            }

            // Create some OpenAL Source Objects

            alGenSources(1, &_source);

            if(alGetError() != AL_NO_ERROR) 

            {

                printf("Error generating sources! %x\n", error);

                exit(1);

            }

        }

    }

    // clear any errors

    alGetError();

    [self initBuffer];  

    [self initSource];

}

- (void)teardownOpenAL

{

    ALCcontext  *context = NULL;

    ALCdevice   *device = NULL;

    // Delete the Sources

    alDeleteSources(1, &_source);

    // Delete the Buffers

    alDeleteBuffers(1, &_buffer);

    //Get active context (there can only be one)

    context = alcGetCurrentContext();

    //Get device for active context

    device = alcGetContextsDevice(context);

    //Release context

    alcDestroyContext(context);

    //Close device

    alcCloseDevice(device);

}

#pragma mark Play / Pause

- (void)startSound

{

    ALenum error;

    printf("Start!\n");

    // Begin playing our source file

    alSourcePlay(_source);

    if((error = alGetError()) != AL_NO_ERROR) {

        printf("error starting source: %x\n", error);

    } else {

        // Mark our state as playing

        self.isPlaying = YES;

    }

}

- (void)stopSound

{

    ALenum error;

    printf("Stop!!\n");

    // Stop playing our source file

    alSourceStop(_source);

    if((error = alGetError()) != AL_NO_ERROR) {

        printf("error stopping source: %x\n", error);

    } else {

        // Mark our state as not playing

        self.isPlaying = NO;

    }

}

#pragma mark Setters / Getters

- (float*)sourcePos

{

    return _sourcePos;

}

- (void)setSourcePos:(float*)SOURCEPOS

{

    int i;

    for (i=0; i<3; i++)

        _sourcePos[i] = SOURCEPOS[i];

    // Move our audio source coordinates

    alSourcefv(_source, AL_POSITION, _sourcePos);

}

- (float*)listenerPos

{

    return _listenerPos;

}

- (void)setListenerPos:(float*)LISTENERPOS

{

    int i;

    for (i=0; i<3; i++)

        _listenerPos[i] = LISTENERPOS[i];

    // Move our listener coordinates

    alListenerfv(AL_POSITION, _listenerPos);

}

- (float)listenerRotation

{

    return _listenerRotation;

}

- (void)setListenerRotation:(float)radians

{

    _listenerRotation = radians;

    float ori[] = {0., cos(radians), sin(radians), 1., 0., 0.};

    // Set our listener orientation (rotation)

    alListenerfv(AL_ORIENTATION, ori);

}

@end