Classes/MixerEQGraphTestDelegate.m

/*
    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