当EZRecorder在iPhone X上调用ExtAudioFileWrite时崩溃

Question

我有一个示例应用程序,它使用AudioKit来录制音频并显示该音频数据的波形.此示例应用程序有两个viewControllers,其中根vc是一个空白页面,其中包含一个按钮,用户可以将该用户带到录音页面.

出于某种原因,仅在iPhone X(iOS 11.4.1)上,在录制音频时,如果我点击导航栏上的后退按钮(左上角),然后尝试再次录制,应用程序将崩溃.

特别是当录音机的方法appendDataFromBufferList: withBufferSize:调用时,应用程序似乎崩溃ExtAudioFileWrite(self.info->extAudioFileRef, bufferSize, bufferList).控制台中打印的错误消息是:

testAudioCrash(1312,0x16e203000)malloc:***对象0x109803a00的错误:释放对象的校验和不正确 - 对象可能在被释放后被修改. ***在malloc_error_break中设置断点以进行调试

我经历过僵尸剖析,泄漏剖析,逐步完成逻辑和堆栈,但我似乎无法弄清楚为什么会发生这种情况.

下面我提供了测试应用程序的代码以及堆栈和控制台输出的屏幕截图.任何帮助弄清楚为什么会崩溃将非常感激.不幸的是,这次崩溃也不是100%可重复的事实让我对它更加模糊.

代码注释如下:.h文件中没有自定义代码,所以我没有提供.每个视图控制器都有xib文件,其中包含UI组件.它们非常简单,所以我没有提供有关这些的信息,虽然我没有任何问题提供任何信息,任何人都要求.如果有人认为有必要,我也可以压缩项目并分享.

Repro步骤:1)启动应用2)点击录制音频按钮3)点击录制按钮4)点击导航栏上的按钮

5)重复步骤2-4直到发生崩溃

AppDelegate.m代码:

#import "AppDelegate.h"
#import "testViewController.h"

@interface AppDelegate ()
@end

@implementation AppDelegate


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.

    testViewController* rootVC = [[testViewController alloc] initWithNibName: @"testViewController" bundle: NSBundle.mainBundle];
    UINavigationController* nav = [[UINavigationController alloc] initWithRootViewController: rootVC];
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.window.rootViewController = nav;
    [self.window makeKeyAndVisible];
    return YES;
}


- (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 invalidate graphics rendering callbacks. Games should use this method to pause the game.
}


- (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, this method is called instead of applicationWillTerminate: when the user quits.
}


- (void)applicationWillEnterForeground:(UIApplication *)application {
    // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
}


- (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.
}


- (void)applicationWillTerminate:(UIApplication *)application {
    // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}


@end

testViewController.m代码:

#import "testViewController.h"
#import "testSecondViewController.h"

@interface testViewController ()

@end

@implementation testViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)AudioRecording:(id)sender
{
    testSecondViewController* sVC = [[testSecondViewController alloc] initWithNibName: @"testSecondViewController" bundle: NSBundle.mainBundle];
    [self.navigationController pushViewController: sVC animated: YES];
}

@end

testSecondViewController.m代码:

#import "testSecondViewController.h"
@import AudioKit;
@import AudioKitUI;

@interface testSecondViewController () <EZMicrophoneDelegate, EZRecorderDelegate>
@property (nonatomic, strong) EZRecorder* recorder;
@property (nonatomic, strong) EZMicrophone* mic;
@property (nonatomic, strong) EZAudioPlayer* player;
@property (strong, nonatomic) IBOutlet EZAudioPlot *audioPlot;
@property (nonatomic, strong) NSURL *finishedRecordingURL;
@property (atomic, assign) BOOL isRecording;

@end

@implementation testSecondViewController

- (void)dealloc
{
    if(_isRecording) [self pauseRecording: _mic];
    if(_recorder) [self finalizeAudioFile: _recorder];
    _recorder.delegate = nil;
    _mic.delegate = nil;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    [EZAudioUtilities setShouldExitOnCheckResultFail: NO];

    [self setupUI];
    [self setupConfig];
    [self audioKitSetup];
}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark UI Methods
-(void)setupUI
{
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Cancel" style: UIBarButtonItemStylePlain target: nil action:@selector(cancelButtonClicked)];
    [self configureWaveFormViewForAudioInput];
}

-(void)setupConfig
{
    [self initializeMic];
    [self initializeRecorder];
}

-(void)initializeMic
{
    self.mic = [[EZMicrophone alloc] initWithMicrophoneDelegate: self];
    self.isRecording = NO;
}

-(void)initializeRecorder
{
    NSURL *fileUrl = [self testFilePathURL];
    self.finishedRecordingURL = fileUrl;

    self.recorder = [[EZRecorder alloc] initWithURL: fileUrl clientFormat: [self.mic audioStreamBasicDescription] fileType: EZRecorderFileTypeM4A delegate: self];
}

#pragma mark - Utils
- (NSArray *)applicationDocuments
{
  return NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
}


- (NSString *)applicationDocumentsDirectory
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;
    return basePath;
}

- (NSURL *)testFilePathURL
{
    self.finishedRecordingURL = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/%@",
                               [self applicationDocumentsDirectory],
                               @"test2.m4a"]];

    if (self.finishedRecordingURL && [[NSFileManager defaultManager] fileExistsAtPath:self.finishedRecordingURL.path])
    {
        NSError *error;
        [[NSFileManager defaultManager] removeItemAtURL:self.finishedRecordingURL error:&error];
        if(error){
            printf("%s", error.description);
        }
    }

    return self.finishedRecordingURL;
}

#pragma mark AudioKit Util methods
- (void) audioKitSetup
{
    [AKSettings setDefaultToSpeaker: YES];
    [AKSettings setAudioInputEnabled: YES];
    [AKSettings setPlaybackWhileMuted: YES];
    [AKSettings setSampleRate: 44100];
    [AKSettings setChannelCount: 1];
}

- (void) configureWaveFormViewForAudioInput
{
//    self.audioPlot.gain = 6;
//    self.audioPlot.color = [UIColor blueColor];
    self.audioPlot.plotType = EZPlotTypeRolling;
//    self.audioPlot.shouldFill = YES;
//    self.audioPlot.shouldMirror = YES;
    [self.view addSubview: self.audioPlot];
    self.audioPlot.clipsToBounds = YES;
}

- (IBAction)startRecording:(id)sender
{
    if (!self.mic)
    {
        self.mic = [EZMicrophone microphoneWithDelegate: self];
    }

    if (!self.recorder)
    {
        if (self.finishedRecordingURL && [[NSFileManager defaultManager] fileExistsAtPath:self.finishedRecordingURL.path])
        {
            self.recorder = [EZRecorder recorderWithURL: self.finishedRecordingURL clientFormat: [self.mic audioStreamBasicDescription] fileType: EZRecorderFileTypeM4A delegate: self];
        }
        else
        {
            self.recorder = [EZRecorder recorderWithURL: [self testFilePathURL] clientFormat: [self.mic audioStreamBasicDescription] fileType: EZRecorderFileTypeM4A delegate: self];
            self.finishedRecordingURL = self.recorder.url;
        }
    }

    [self.mic startFetchingAudio];
    self.isRecording = YES;
}

- (IBAction)pauseRecording:(id)sender
{
    [self.mic stopFetchingAudio];
    self.isRecording = NO;
}

- (void) finalizeAudioFile: (EZRecorder*) recorder
{
    if (self.isRecording)
    {
        [self.mic stopFetchingAudio];
    }

    [recorder closeAudioFile];
}

- (IBAction)cancelButtonClicked:(id)sender
{
        if(self.isRecording)
    {
        [self pauseRecording: self.mic];
    }

    UIAlertController *alert = [UIAlertController alertControllerWithTitle: @"Delete recording?" message:@"Would you like to delete your audio recording and stop recording?" preferredStyle: UIAlertControllerStyleAlert];

        UIAlertAction* yesButton = [UIAlertAction
                                actionWithTitle:@"Discard"
                                style:UIAlertActionStyleDefault
                                handler:^(UIAlertAction * action) {

                                    [self finalizeAudioFile: self.recorder];

                                    NSError *error;
                                    [[NSFileManager defaultManager] removeItemAtURL:self.finishedRecordingURL error:&error];
                                    if(error){
                                        printf("%s", error.description);
                                    }

                                     [self dismissViewControllerAnimated:YES completion:NULL];
                                }];

        UIAlertAction* noButton = [UIAlertAction
                               actionWithTitle:@"Cancel"
                               style:UIAlertActionStyleDefault
                               handler:^(UIAlertAction * action) {
                                   [alert dismissViewControllerAnimated:YES completion: nil];
                               }];

                                   [alert addAction:yesButton];
    [alert addAction:noButton];

    [self presentViewController:alert animated:YES completion:nil];
}

#pragma mark - EZMicrophone Delegate methods
- (void)  microphone:(EZMicrophone *)microphone
    hasAudioReceived:(float **)buffer
      withBufferSize:(UInt32)bufferSize
withNumberOfChannels:(UInt32)numberOfChannels
{
    __weak typeof (self) weakling = self;
    dispatch_async(dispatch_get_main_queue(), ^{
        [weakling.audioPlot updateBuffer:buffer[0]
                          withBufferSize:bufferSize];
    });
}

- (void)  microphone:(EZMicrophone *)microphone
       hasBufferList:(AudioBufferList *)bufferList
      withBufferSize:(UInt32)bufferSize
withNumberOfChannels:(UInt32)numberOfChannels
{
    if (self.isRecording)
    {
        [self.recorder appendDataFromBufferList:bufferList
                                 withBufferSize:bufferSize];
    }
}

- (void)microphone:(EZMicrophone *)microphone changedPlayingState:(BOOL)isPlaying
{
    self.isRecording = isPlaying;
}

@end

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