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Dan Grigsby committed Aug 19, 2009
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7 changes: 7 additions & 0 deletions .gitignore
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build
*.pbxuser
*.perspective
*.perspectivev3
*.mode1v3
*.mode2v3
.DS_Store
22 changes: 22 additions & 0 deletions Classes/MicBlowAppDelegate.h
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//
// MicBlowAppDelegate.h
// MicBlow
//
// Created by Dan Grigsby on 8/19/09.
// Copyright __MyCompanyName__ 2009. All rights reserved.
//

#import <UIKit/UIKit.h>

@class MicBlowViewController;

@interface MicBlowAppDelegate : NSObject <UIApplicationDelegate> {
UIWindow *window;
MicBlowViewController *viewController;
}

@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet MicBlowViewController *viewController;

@end

33 changes: 33 additions & 0 deletions Classes/MicBlowAppDelegate.m
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//
// MicBlowAppDelegate.m
// MicBlow
//
// Created by Dan Grigsby on 8/19/09.
// Copyright __MyCompanyName__ 2009. All rights reserved.
//

#import "MicBlowAppDelegate.h"
#import "MicBlowViewController.h"

@implementation MicBlowAppDelegate

@synthesize window;
@synthesize viewController;


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

// Override point for customization after app launch
[window addSubview:viewController.view];
[window makeKeyAndVisible];
}


- (void)dealloc {
[viewController release];
[window release];
[super dealloc];
}


@end
14 changes: 14 additions & 0 deletions Classes/MicBlowViewController.h
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#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
#import <CoreAudio/CoreAudioTypes.h>

@interface MicBlowViewController : UIViewController {
AVAudioRecorder *recorder;
NSTimer *levelTimer;
double lowPassResults;
}

- (void)levelTimerCallback:(NSTimer *)timer;

@end

49 changes: 49 additions & 0 deletions Classes/MicBlowViewController.m
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#import "MicBlowViewController.h"

@implementation MicBlowViewController

- (void)viewDidLoad {
[super viewDidLoad];

NSURL *url = [NSURL fileURLWithPath:@"/dev/null"];

NSDictionary *settings = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithFloat: 44100.0], AVSampleRateKey,
[NSNumber numberWithInt: kAudioFormatAppleLossless], AVFormatIDKey,
[NSNumber numberWithInt: 1], AVNumberOfChannelsKey,
[NSNumber numberWithInt: AVAudioQualityMax], AVEncoderAudioQualityKey,
nil];

NSError *error;

recorder = [[AVAudioRecorder alloc] initWithURL:url settings:settings error:&error];

if (recorder) {
[recorder prepareToRecord];
recorder.meteringEnabled = YES;
[recorder record];
levelTimer = [NSTimer scheduledTimerWithTimeInterval: 0.03 target: self selector: @selector(levelTimerCallback:) userInfo: nil repeats: YES];
} else
NSLog([error description]);
}


- (void)levelTimerCallback:(NSTimer *)timer {
[recorder updateMeters];

const double ALPHA = 0.05;
double peakPowerForChannel = pow(10, (0.05 * [recorder peakPowerForChannel:0]));
lowPassResults = ALPHA * peakPowerForChannel + (1.0 - ALPHA) * lowPassResults;

if (lowPassResults < 0.95)
NSLog(@"Mic blow detected");
}


- (void)dealloc {
[levelTimer release];
[recorder release];
[super dealloc];
}

@end
218 changes: 218 additions & 0 deletions MainWindow.xib
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30 changes: 30 additions & 0 deletions MicBlow-Info.plist
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>CFBundleDevelopmentRegion</key>
<string>English</string>
<key>CFBundleDisplayName</key>
<string>${PRODUCT_NAME}</string>
<key>CFBundleExecutable</key>
<string>${EXECUTABLE_NAME}</string>
<key>CFBundleIconFile</key>
<string></string>
<key>CFBundleIdentifier</key>
<string>com.yourcompany.${PRODUCT_NAME:rfc1034identifier}</string>
<key>CFBundleInfoDictionaryVersion</key>
<string>6.0</string>
<key>CFBundleName</key>
<string>${PRODUCT_NAME}</string>
<key>CFBundlePackageType</key>
<string>APPL</string>
<key>CFBundleSignature</key>
<string>????</string>
<key>CFBundleVersion</key>
<string>1.0</string>
<key>LSRequiresIPhoneOS</key>
<true/>
<key>NSMainNibFile</key>
<string>MainWindow</string>
</dict>
</plist>
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