Classes/MultichannelMixerTestDelegate.m

/*
     File: MultichannelMixerTestDelegate.m 
 Abstract: The application delegate class.
  
  Version: 1.1.1 
  
 Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple 
 Inc. ("Apple") in consideration of your agreement to the following 
 terms, and your use, installation, modification or redistribution of 
 this Apple software constitutes acceptance of these terms.  If you do 
 not agree with these terms, please do not use, install, modify or 
 redistribute this Apple software. 
  
 In consideration of your agreement to abide by the following terms, and 
 subject to these terms, Apple grants you a personal, non-exclusive 
 license, under Apple's copyrights in this original Apple software (the 
 "Apple Software"), to use, reproduce, modify and redistribute the Apple 
 Software, with or without modifications, in source and/or binary forms; 
 provided that if you redistribute the Apple Software in its entirety and 
 without modifications, you must retain this notice and the following 
 text and disclaimers in all such redistributions of the Apple Software. 
 Neither the name, trademarks, service marks or logos of Apple Inc. may 
 be used to endorse or promote products derived from the Apple Software 
 without specific prior written permission from Apple.  Except as 
 expressly stated in this notice, no other rights or licenses, express or 
 implied, are granted by Apple herein, including but not limited to any 
 patent rights that may be infringed by your derivative works or by other 
 works in which the Apple Software may be incorporated. 
  
 The Apple Software is provided by Apple on an "AS IS" basis.  APPLE 
 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION 
 THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS 
 FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND 
 OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS. 
  
 IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL 
 OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, 
 MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED 
 AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE), 
 STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE 
 POSSIBILITY OF SUCH DAMAGE. 
  
 Copyright (C) 2013 Apple Inc. All Rights Reserved. 
  
*/
 
#import "MultichannelMixerTestDelegate.h"
 
@implementation MultichannelMixerTestDelegate
 
@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: %@", error);
    }
}
 
#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 the sample rate
        printf("Hardware Sample Rate: %.1f Hz\n", sessionInstance.sampleRate);
    } 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 mixerController object
    [myViewController.mixerController 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];
}
 
- (void)applicationDidEnterBackground:(UIApplication *)application {
    /*
     Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later. 
     If your application supports background execution, called instead of applicationWillTerminate: when the user quits.
     */
     
    printf("applicationDidEnterBackground\n");
}
 
 
- (void)applicationWillEnterForeground:(UIApplication *)application {
    /*
     Called as part of  transition from the background to the inactive state: here you can undo many of the changes made on entering the background.
     */
     
     printf("applicationWillEnterForeground\n");
}
 
- (void)applicationWillResignActive:(UIApplication *)application {
    /*
     Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
     Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
     */
    
    printf("applicationWillResignActive\n");
}
 
- (void)applicationDidBecomeActive:(UIApplication *)application {
    /*
     Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
     */
    
    printf("applicationDidBecomeActive\n");
}
 
@end