├── picture1.png ├── Audio Shift ├── audio1.m4a ├── audio2.m4a ├── ViewController.h ├── AppDelegate.h ├── main.m ├── ShiftModel.h ├── ViewController.m ├── Images.xcassets │ └── AppIcon.appiconset │ │ └── Contents.json ├── Info.plist ├── Base.lproj │ ├── Main.storyboard │ └── LaunchScreen.xib ├── AppDelegate.m └── ShiftModel.m ├── Audio Shift.xcodeproj ├── project.xcworkspace │ └── contents.xcworkspacedata └── project.pbxproj ├── .gitignore ├── Audio ShiftTests ├── Info.plist └── Audio_ShiftTests.m ├── LICENSE └── README.md /picture1.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Vaberer/audio_time_shifting/HEAD/picture1.png -------------------------------------------------------------------------------- /Audio Shift/audio1.m4a: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Vaberer/audio_time_shifting/HEAD/Audio Shift/audio1.m4a -------------------------------------------------------------------------------- /Audio Shift/audio2.m4a: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Vaberer/audio_time_shifting/HEAD/Audio Shift/audio2.m4a -------------------------------------------------------------------------------- /Audio Shift.xcodeproj/project.xcworkspace/contents.xcworkspacedata: -------------------------------------------------------------------------------- 1 | 2 | 4 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /Audio Shift/ViewController.h: -------------------------------------------------------------------------------- 1 | // 2 | // ViewController.h 3 | // Audio Shift 4 | // 5 | // Created by Patrik Vaberer on 5/27/15. 6 | // Copyright (c) 2015 Patrik Vaberer. All rights reserved. 7 | // 8 | 9 | #import 10 | 11 | @interface ViewController : UIViewController 12 | 13 | 14 | @end 15 | 16 | -------------------------------------------------------------------------------- /Audio Shift/AppDelegate.h: -------------------------------------------------------------------------------- 1 | // 2 | // AppDelegate.h 3 | // Audio Shift 4 | // 5 | // Created by Patrik Vaberer on 5/27/15. 6 | // Copyright (c) 2015 Patrik Vaberer. All rights reserved. 7 | // 8 | 9 | #import 10 | 11 | @interface AppDelegate : UIResponder 12 | 13 | @property (strong, nonatomic) UIWindow *window; 14 | 15 | 16 | @end 17 | 18 | -------------------------------------------------------------------------------- /Audio Shift/main.m: -------------------------------------------------------------------------------- 1 | // 2 | // main.m 3 | // Audio Shift 4 | // 5 | // Created by Patrik Vaberer on 5/27/15. 6 | // Copyright (c) 2015 Patrik Vaberer. All rights reserved. 7 | // 8 | 9 | #import 10 | #import "AppDelegate.h" 11 | 12 | int main(int argc, char * argv[]) { 13 | @autoreleasepool { 14 | return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class])); 15 | } 16 | } 17 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # Xcode 2 | # 3 | build/ 4 | *.pbxuser 5 | !default.pbxuser 6 | *.mode1v3 7 | !default.mode1v3 8 | *.mode2v3 9 | !default.mode2v3 10 | *.perspectivev3 11 | !default.perspectivev3 12 | xcuserdata 13 | *.xccheckout 14 | *.moved-aside 15 | DerivedData 16 | *.hmap 17 | *.ipa 18 | *.xcuserstate 19 | 20 | # CocoaPods 21 | # 22 | # We recommend against adding the Pods directory to your .gitignore. However 23 | # you should judge for yourself, the pros and cons are mentioned at: 24 | # http://guides.cocoapods.org/using/using-cocoapods.html#should-i-ignore-the-pods-directory-in-source-control 25 | # 26 | #Pods/ 27 | -------------------------------------------------------------------------------- /Audio Shift/ShiftModel.h: -------------------------------------------------------------------------------- 1 | // 2 | // ShiftModel.h 3 | // Audio Shift 4 | // 5 | // Created by Patrik Vaberer on 5/27/15. 6 | // Copyright (c) 2015 Patrik Vaberer. All rights reserved. 7 | // 8 | 9 | #import 10 | 11 | NS_CLASS_AVAILABLE_IOS(8_0) @interface ShiftModel : NSObject 12 | 13 | /** 14 | Process the cross-corelation to determine time shift between two audio files. 15 | Sample rate and file format must be equal. 16 | @param audioURL1 First audio file 17 | @param audioURL2 Second audio file 18 | @return Time shift in seconds. If the vaule is DBL_MIN, it could not find out the time shift. 19 | */ 20 | + (double)getTimeShiftFirstAudioURL:(NSURL *)audioURL1 secondAudio:(NSURL *)audioURL2; 21 | 22 | @end 23 | -------------------------------------------------------------------------------- /Audio Shift/ViewController.m: -------------------------------------------------------------------------------- 1 | // 2 | // ViewController.m 3 | // Audio Shift 4 | // 5 | // Created by Patrik Vaberer on 5/27/15. 6 | // Copyright (c) 2015 Patrik Vaberer. All rights reserved. 7 | // 8 | 9 | #import "ViewController.h" 10 | #import "ShiftModel.h" 11 | @interface ViewController () 12 | 13 | @end 14 | 15 | @implementation ViewController 16 | 17 | - (void)viewDidLoad { 18 | [super viewDidLoad]; 19 | 20 | NSURL *audioURL1 = [[NSBundle mainBundle] URLForResource:@"audio2" withExtension:@"m4a"]; 21 | NSURL *audioURL2 = [[NSBundle mainBundle] URLForResource:@"audio1" withExtension:@"m4a"];; 22 | 23 | 24 | [ShiftModel getTimeShiftFirstAudioURL:audioURL1 secondAudio:audioURL2]; 25 | 26 | 27 | } 28 | 29 | 30 | 31 | @end 32 | -------------------------------------------------------------------------------- /Audio Shift/Images.xcassets/AppIcon.appiconset/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "images" : [ 3 | { 4 | "idiom" : "iphone", 5 | "size" : "29x29", 6 | "scale" : "2x" 7 | }, 8 | { 9 | "idiom" : "iphone", 10 | "size" : "29x29", 11 | "scale" : "3x" 12 | }, 13 | { 14 | "idiom" : "iphone", 15 | "size" : "40x40", 16 | "scale" : "2x" 17 | }, 18 | { 19 | "idiom" : "iphone", 20 | "size" : "40x40", 21 | "scale" : "3x" 22 | }, 23 | { 24 | "idiom" : "iphone", 25 | "size" : "60x60", 26 | "scale" : "2x" 27 | }, 28 | { 29 | "idiom" : "iphone", 30 | "size" : "60x60", 31 | "scale" : "3x" 32 | } 33 | ], 34 | "info" : { 35 | "version" : 1, 36 | "author" : "xcode" 37 | } 38 | } -------------------------------------------------------------------------------- /Audio ShiftTests/Info.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | en 7 | CFBundleExecutable 8 | $(EXECUTABLE_NAME) 9 | CFBundleIdentifier 10 | vaberer.$(PRODUCT_NAME:rfc1034identifier) 11 | CFBundleInfoDictionaryVersion 12 | 6.0 13 | CFBundleName 14 | $(PRODUCT_NAME) 15 | CFBundlePackageType 16 | BNDL 17 | CFBundleShortVersionString 18 | 1.0 19 | CFBundleSignature 20 | ???? 21 | CFBundleVersion 22 | 1 23 | 24 | 25 | -------------------------------------------------------------------------------- /Audio ShiftTests/Audio_ShiftTests.m: -------------------------------------------------------------------------------- 1 | // 2 | // Audio_ShiftTests.m 3 | // Audio ShiftTests 4 | // 5 | // Created by Patrik Vaberer on 5/27/15. 6 | // Copyright (c) 2015 Patrik Vaberer. All rights reserved. 7 | // 8 | 9 | #import 10 | #import 11 | 12 | @interface Audio_ShiftTests : XCTestCase 13 | 14 | @end 15 | 16 | @implementation Audio_ShiftTests 17 | 18 | - (void)setUp { 19 | [super setUp]; 20 | // Put setup code here. This method is called before the invocation of each test method in the class. 21 | } 22 | 23 | - (void)tearDown { 24 | // Put teardown code here. This method is called after the invocation of each test method in the class. 25 | [super tearDown]; 26 | } 27 | 28 | - (void)testExample { 29 | // This is an example of a functional test case. 30 | XCTAssert(YES, @"Pass"); 31 | } 32 | 33 | - (void)testPerformanceExample { 34 | // This is an example of a performance test case. 35 | [self measureBlock:^{ 36 | // Put the code you want to measure the time of here. 37 | }]; 38 | } 39 | 40 | @end 41 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | The MIT License (MIT) 2 | 3 | Copyright (c) 2015 Patrik Vaberer 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | 23 | -------------------------------------------------------------------------------- /Audio Shift/Info.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | en 7 | CFBundleExecutable 8 | $(EXECUTABLE_NAME) 9 | CFBundleIdentifier 10 | vaberer.$(PRODUCT_NAME:rfc1034identifier) 11 | CFBundleInfoDictionaryVersion 12 | 6.0 13 | CFBundleName 14 | $(PRODUCT_NAME) 15 | CFBundlePackageType 16 | APPL 17 | CFBundleShortVersionString 18 | 1.0 19 | CFBundleSignature 20 | ???? 21 | CFBundleVersion 22 | 1 23 | LSRequiresIPhoneOS 24 | 25 | UILaunchStoryboardName 26 | LaunchScreen 27 | UIMainStoryboardFile 28 | Main 29 | UIRequiredDeviceCapabilities 30 | 31 | armv7 32 | 33 | UISupportedInterfaceOrientations 34 | 35 | UIInterfaceOrientationPortrait 36 | 37 | 38 | 39 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Audio Time Shifting 2 | ![Font Awesome Swift](https://github.com/Vaberer/Font-Awesome-Swift/blob/master/resources/opensource_matters.png) 3 | 4 | Follow me: [@vaberer](https://twitter.com/vaberer) 5 | 6 | I like ★. Do not forget to ★ this project. 7 | 8 | 9 | Determining a time shift between two audio files. 10 | 11 | The result of the function is a number in seconds: 12 |

13 | 14 |

15 | 16 | Demnostration of finding time shift between two audio files in Objective-C compatible with iOS8. 17 | 18 | Sample code contains two audio files i na Bundle in which we perform a cross-correlation 19 | and determine time shift is seconds. 20 | 21 | We were recording a youtube song where the second audio - ```audio2.m4a``` is shifted in 3 minutes. 22 | 23 | The code is also optimalized by 50 times. We presume that sample rate and file formats of two audio files are equal. 24 | 25 |

Author

Licence

34 | 35 | Audio Time Shifting is available under the MIT license. See the LICENSE file for more info. 36 | 37 | -------------------------------------------------------------------------------- /Audio Shift/Base.lproj/Main.storyboard: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | -------------------------------------------------------------------------------- /Audio Shift/AppDelegate.m: -------------------------------------------------------------------------------- 1 | // 2 | // AppDelegate.m 3 | // Audio Shift 4 | // 5 | // Created by Patrik Vaberer on 5/27/15. 6 | // Copyright (c) 2015 Patrik Vaberer. All rights reserved. 7 | // 8 | 9 | #import "AppDelegate.h" 10 | 11 | @interface AppDelegate () 12 | 13 | @end 14 | 15 | @implementation AppDelegate 16 | 17 | 18 | - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 19 | // Override point for customization after application launch. 20 | return YES; 21 | } 22 | 23 | - (void)applicationWillResignActive:(UIApplication *)application { 24 | // 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. 25 | // 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. 26 | } 27 | 28 | - (void)applicationDidEnterBackground:(UIApplication *)application { 29 | // 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. 30 | // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits. 31 | } 32 | 33 | - (void)applicationWillEnterForeground:(UIApplication *)application { 34 | // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background. 35 | } 36 | 37 | - (void)applicationDidBecomeActive:(UIApplication *)application { 38 | // 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. 39 | } 40 | 41 | - (void)applicationWillTerminate:(UIApplication *)application { 42 | // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:. 43 | } 44 | 45 | @end 46 | -------------------------------------------------------------------------------- /Audio Shift/Base.lproj/LaunchScreen.xib: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | -------------------------------------------------------------------------------- /Audio Shift/ShiftModel.m: -------------------------------------------------------------------------------- 1 | // 2 | // ShiftModel.m 3 | // Audio Shift 4 | // 5 | // Created by Patrik Vaberer on 5/27/15. 6 | // Copyright (c) 2015 Patrik Vaberer. All rights reserved. 7 | // 8 | 9 | #import "ShiftModel.h" 10 | #import 11 | #include 12 | 13 | 14 | @implementation ShiftModel 15 | 16 | 17 | 18 | static ShiftModel *shiftModel; 19 | + (id) s { 20 | if (shiftModel == nil) 21 | shiftModel = [[self alloc] init]; 22 | return shiftModel; 23 | 24 | } 25 | 26 | 27 | 28 | + (double)getTimeShiftFirstAudioURL:(NSURL *)audioURL1 secondAudio:(NSURL *)audioURL2 { 29 | 30 | if (audioURL1 == nil || audioURL2 == nil) { 31 | 32 | NSLog(@"%@", @"One of the audio files is nil"); 33 | return DBL_MIN; 34 | 35 | } 36 | 37 | // Record *longerRecord = myRecord.rDuration.floatValue > newRecord.rDuration.floatValue ? myRecord : newRecord; 38 | // 39 | // //[self changeSampleRate:[H getURLFromString:longerRecord.rFileName]]; 40 | // 41 | // Record *shorterRecord = myRecord.rDuration.floatValue <= newRecord.rDuration.floatValue ? myRecord : newRecord; 42 | // 43 | 44 | //load first audio 45 | NSError *er = nil; 46 | AVAudioFile *myAudioFile1 = [[AVAudioFile alloc] initForReading:audioURL1 error:&er]; 47 | if (er) { 48 | NSLog(@"%@", er.localizedDescription); 49 | return DBL_MIN; 50 | } 51 | 52 | 53 | 54 | 55 | 56 | //load second audio 57 | er = nil; 58 | AVAudioFile *myAudioFile2 = [[AVAudioFile alloc] initForReading:audioURL2 error:&er]; 59 | if (er) { 60 | NSLog(@"%@", er.localizedDescription); 61 | return DBL_MIN; 62 | } 63 | 64 | 65 | 66 | //we compare longer audio against the shorter audio 67 | if (myAudioFile2.length / myAudioFile2.processingFormat.sampleRate > myAudioFile1.length / myAudioFile1.processingFormat.sampleRate) { 68 | 69 | AVAudioFile *t = myAudioFile1; 70 | myAudioFile1 = myAudioFile2; 71 | myAudioFile2 = t; 72 | 73 | } 74 | 75 | 76 | AVAudioFormat *myAudioFormat1 = myAudioFile1.processingFormat; 77 | UInt32 myAudioFrameCount1 = (UInt32)myAudioFile1.length - 1; 78 | 79 | AVAudioPCMBuffer *myAudioBuffer1 = [[AVAudioPCMBuffer alloc] initWithPCMFormat:myAudioFormat1 frameCapacity:myAudioFrameCount1]; 80 | 81 | 82 | 83 | AVAudioFormat *myAudioFormat2 = myAudioFile2.processingFormat; 84 | UInt32 myAudioFrameCount2 = (UInt32)myAudioFile2.length - 1; 85 | AVAudioPCMBuffer *myAudioBuffer2 = [[AVAudioPCMBuffer alloc] initWithPCMFormat:myAudioFormat2 frameCapacity:myAudioFrameCount2]; 86 | 87 | 88 | 89 | 90 | 91 | if (myAudioFormat1.sampleRate != myAudioFormat2.sampleRate) { 92 | 93 | NSLog(@"%@", @"Sample rate needs to be equal"); 94 | return DBL_MIN; 95 | } 96 | int workingFrequency = myAudioFormat1.sampleRate; 97 | 98 | 99 | 100 | er = nil; 101 | [myAudioFile1 readIntoBuffer:myAudioBuffer1 error:&er]; 102 | if (er) { 103 | NSLog(@"%@", er.localizedDescription); 104 | return DBL_MIN; 105 | } 106 | float *audioSample1 = myAudioBuffer1.floatChannelData[0]; 107 | int bufferSize1 = myAudioBuffer1.frameLength; 108 | 109 | 110 | 111 | 112 | 113 | er = nil; 114 | [myAudioFile2 readIntoBuffer:myAudioBuffer2 error:&er]; 115 | if (er) { 116 | NSLog(@"%@", er.localizedDescription); 117 | return DBL_MIN; 118 | } 119 | 120 | float *audioSample2 = myAudioBuffer2.floatChannelData[0]; 121 | int bufferSize2 = myAudioBuffer2.frameLength; 122 | 123 | 124 | #define CUT_DOWN 50 125 | 126 | int buffer1PaddingCount = 0; 127 | while (audioSample1[buffer1PaddingCount] == 0 && ++buffer1PaddingCount < bufferSize1); 128 | 129 | int bufferSize1WithoutPadding = (bufferSize1 - buffer1PaddingCount) / CUT_DOWN; 130 | 131 | 132 | int buffer2PaddingCount = 0; 133 | while (audioSample1[buffer2PaddingCount] == 0 && ++buffer2PaddingCount < bufferSize2); 134 | 135 | int bufferSize2WithoutPadding = (bufferSize2 - buffer2PaddingCount) / CUT_DOWN; 136 | 137 | 138 | int32_t newBufferSize1 = (bufferSize1WithoutPadding + bufferSize2WithoutPadding * 2) * sizeof(float); 139 | float *newBuffer1 = (float *)malloc( newBufferSize1 ); 140 | memset(newBuffer1, 0, bufferSize2WithoutPadding * sizeof(float)); 141 | 142 | 143 | float *shiftedBuffer1 = newBuffer1 + bufferSize2WithoutPadding; 144 | 145 | 146 | int tCounter = 0; 147 | for (int i = buffer1PaddingCount * 2; i < bufferSize1; i+= 1 * CUT_DOWN) { 148 | *shiftedBuffer1++ = audioSample1[i]; 149 | tCounter++; 150 | } 151 | memset(shiftedBuffer1 , 0, bufferSize2WithoutPadding * sizeof(float)); 152 | myAudioBuffer1 = nil; 153 | 154 | 155 | float *newBuffer2 = (float *)malloc(bufferSize2WithoutPadding * sizeof(float)); 156 | 157 | 158 | 159 | int indexBuffer2 = 0; 160 | for (int i = buffer2PaddingCount * 2; i < bufferSize2; i+= 1 * CUT_DOWN ) { 161 | 162 | newBuffer2[indexBuffer2] = audioSample2[i]; 163 | indexBuffer2++; 164 | } 165 | myAudioBuffer2 = nil; 166 | 167 | float *audio2Input, *audio1Input; 168 | float *resultInput; 169 | 170 | int32_t audio1Stride, audio2Stride, resultStride; 171 | uint32_t audio2Length, audio1Length, resultLength; 172 | 173 | audio1Length = bufferSize1WithoutPadding; 174 | audio1Stride = 1; 175 | audio1Input = newBuffer1; 176 | 177 | audio2Length = indexBuffer2; 178 | audio2Stride = 1; 179 | audio2Input = newBuffer2; 180 | 181 | resultInput = (float *)malloc(((audio1Length + audio2Length) / audio1Stride) * sizeof(float)); 182 | resultLength = (int32_t)(audio1Length + (int32_t)audio2Length) / audio1Stride; 183 | resultStride = 1; 184 | 185 | 186 | vDSP_conv(audio1Input, audio1Stride, audio2Input, audio2Stride, resultInput, resultStride, resultLength, audio2Length); 187 | free(audio1Input); 188 | free(audio2Input); 189 | 190 | float max = FLT_MIN; 191 | int maxIndex = 0; 192 | for (int i = 0; i < resultLength; i++) { 193 | 194 | if (fabs(resultInput[i]) > max) { 195 | max = resultInput[i]; 196 | maxIndex = i; 197 | } 198 | } 199 | free(resultInput); 200 | 201 | double timeShift = (float)(maxIndex - bufferSize2WithoutPadding + buffer2PaddingCount / CUT_DOWN) / (workingFrequency / CUT_DOWN); 202 | 203 | NSLog(@"The biggest match is %@ at the position: %@", @(max),@(maxIndex) ); 204 | NSLog(@"Time shift is: %@ seconds", @(timeShift)); 205 | 206 | return timeShift; 207 | 208 | 209 | } 210 | 211 | @end 212 | -------------------------------------------------------------------------------- /Audio Shift.xcodeproj/project.pbxproj: -------------------------------------------------------------------------------- 1 | // !$*UTF8*$! 2 | { 3 | archiveVersion = 1; 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