/*

    File: MixerEQGraphTestDelegate.m  

Abstract: The application delegate class.  

 Version: 1.2.2  

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*/

#import "MixerEQGraphTestDelegate.h"

@implementation MixerEQGraphTestDelegate

@synthesize window, navigationController, myViewController;

#pragma mark -Audio Session Interruption Notification

- (void)handleInterruption:(NSNotification *)notification

{

    UInt8 theInterruptionType = [[notification.userInfo valueForKey:AVAudioSessionInterruptionTypeKey] intValue];

    NSLog(@"Session interrupted > --- %s ---\n", theInterruptionType == AVAudioSessionInterruptionTypeBegan ? "Begin Interruption" : "End Interruption");

    if (theInterruptionType == AVAudioSessionInterruptionTypeBegan) {

        [self->myViewController stopForInterruption];

    }

    if (theInterruptionType == AVAudioSessionInterruptionTypeEnded) {

        // make sure to activate the session

        NSError *error = nil;

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

        if (nil != error) NSLog(@"AVAudioSession set active failed with error: %d", error.code);

    }

}

#pragma mark -Audio Session Route Change Notification

- (void)handleRouteChange:(NSNotification *)notification

{

    UInt8 reasonValue = [[notification.userInfo valueForKey:AVAudioSessionRouteChangeReasonKey] intValue];

    AVAudioSessionRouteDescription *routeDescription = [notification.userInfo valueForKey:AVAudioSessionRouteChangePreviousRouteKey];

    NSLog(@"Route change:");

    switch (reasonValue) {

    case AVAudioSessionRouteChangeReasonNewDeviceAvailable:

        NSLog(@"     NewDeviceAvailable");

        break;

    case AVAudioSessionRouteChangeReasonOldDeviceUnavailable:

        NSLog(@"     OldDeviceUnavailable");

        break;

    case AVAudioSessionRouteChangeReasonCategoryChange:

        NSLog(@"     CategoryChange");

        NSLog(@" New Category: %@", [[AVAudioSession sharedInstance] category]);

        break;

    case AVAudioSessionRouteChangeReasonOverride:

        NSLog(@"     Override");

        break;

    case AVAudioSessionRouteChangeReasonWakeFromSleep:

        NSLog(@"     WakeFromSleep");

        break;

    case AVAudioSessionRouteChangeReasonNoSuitableRouteForCategory:

        NSLog(@"     NoSuitableRouteForCategory");

        break;

    default:

        NSLog(@"     ReasonUnknown");

    }

    NSLog(@"Previous route:\n");

    NSLog(@"%@", routeDescription);

}

- (void)applicationDidFinishLaunching:(UIApplication *)application {    

    // Override point for customization after application launch

    self.window.rootViewController = navigationController;

    [window makeKeyAndVisible];

    try {

        NSError *error = nil;

        // Configure the audio session

        AVAudioSession *sessionInstance = [AVAudioSession sharedInstance];

        // our default category -- we change this for conversion and playback appropriately

        [sessionInstance setCategory:AVAudioSessionCategoryPlayback error:&error];

        XThrowIfError(error.code, "couldn't set audio category");

        NSTimeInterval bufferDuration = .005;

        [sessionInstance setPreferredIOBufferDuration:bufferDuration error:&error];

        XThrowIfError(error.code, "couldn't set IOBufferDuration");

        double hwSampleRate = 44100.0;

        [sessionInstance setPreferredSampleRate:hwSampleRate error:&error];

        XThrowIfError(error.code, "couldn't set preferred sample rate");

        // add interruption handler

        [[NSNotificationCenter defaultCenter] addObserver:self

                                                 selector:@selector(handleInterruption:) 

                                                     name:AVAudioSessionInterruptionNotification 

                                                   object:sessionInstance];

        // we don't do anything special in the route change notification

        [[NSNotificationCenter defaultCenter] addObserver:self

                                                 selector:@selector(handleRouteChange:)

                                                     name:AVAudioSessionRouteChangeNotification 

                                                   object:sessionInstance];

        // activate the audio session

        [sessionInstance setActive:YES error:&error];

        XThrowIfError(error.code, "couldn't set audio session active\n");

        // just print out some info

        printf("Current IOBufferDuration: %fms\n", sessionInstance.IOBufferDuration * 1000);

        printf("Hardware Sample Rate: %.1fHz\n", sessionInstance.sampleRate);

        printf("Current Hardware Output Latency: %fms\n", sessionInstance.outputLatency * 1000);

    } catch (CAXException e) {

        char buf[256];

        fprintf(stderr, "Error: %s (%s)\n", e.mOperation, e.FormatError(buf));

        printf("You probably want to fix this before continuing!");

    }

    // initialize the graphController object

    [myViewController.graphController initializeAUGraph];

    // set up the mixer according to our interface defaults

    [myViewController setUIDefaults];

}

- (void)dealloc {

    self.window = nil;

    self.navigationController = nil;

    self.myViewController = nil;

    [[NSNotificationCenter defaultCenter] removeObserver:self

                                                    name:AVAudioSessionInterruptionNotification 

                                                  object:[AVAudioSession sharedInstance]];

    [[NSNotificationCenter defaultCenter] removeObserver:self

                                                    name:AVAudioSessionRouteChangeNotification 

                                                  object:[AVAudioSession sharedInstance]];

    [super dealloc];

}

@end