使用 AVAudioRecorder 录制语音后的空文件

Posted 2023-02-25

【中文标题】使用 AVAudioRecorder 录制语音后的空文件

【英文标题】：Empty file after recording voice with AVAudioRecorder

【发布时间】：2016-12-31 09:48:33

【问题描述】：

我尝试使用 AVAudioRecorder 录制语音，录制后我有一个 0 字节的空文件，当尝试播放它时，我有这个警告

2016-12-31 15:28:59.511 FlowerProject[11209:4781594] 15:28:59.511
 WARNING:  [0x38cb1000] 998: Failure to setup sound, err = -50

我尝试使用任何格式，例如 m4a，它也是 0 字节大小。感谢您的帮助。

编辑：

同时我尝试录制音频并用动画更新我的 UI

- (void)commanClickOnPetal:(FlowerObject *)flowerObject andButton:(UIButton *)sender 

    if ([[NSUserDefaults standardUserDefaults] boolForKey:flowerObject.imageName] == NO || ![[NSUserDefaults standardUserDefaults] boolForKey:flowerObject.imageName]) 

        [self.flowerObject changeRecordedState:YES andKey:flowerObject.imageName];

        self.view.userInteractionEnabled = NO;
        [self playFirstSound];

        [self initRecorderWithName:[NSString stringWithFormat:@"%@sound", flowerObject.imageName]];

        dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, 10 * NSEC_PER_SEC);
        dispatch_after(popTime, dispatch_get_main_queue(), ^(void)

            [self startRecording];
            [self.recordIdentifierLabel setHidden:NO];


            [UIView animateWithDuration:1.f
                              delay:0.f
                            options: UIViewAnimationOptionRepeat | UIViewAnimationCurveLinear | UIViewAnimationOptionAutoreverse
                         animations:^
                             [self.recordIdentifierLabel setAlpha:0.0f];
                          completion:nil];


            [UIView transitionWithView:sender duration:29.0f options:UIViewAnimationOptionTransitionCrossDissolve | UIViewAnimationOptionAllowAnimatedContent animations:^

                [sender setBackgroundImage:[UIImage imageNamed:[NSString stringWithFormat:@"%@BW",flowerObject.imageName]] forState:UIControlStateNormal];


             completion:^(BOOL finished) 

                self.view.userInteractionEnabled = YES;
                [self.recordIdentifierLabel setHidden:YES];

            ];

        );

     else 

        [self playSoundFromPetal:[NSString stringWithFormat:@"%@sound", flowerObject.imageName]];

    

这是我的记录器初始化方法：

- (void)initRecorderWithName:(NSString *)name 

    self.recordName = [NSString stringWithFormat:@"%@.wav",name];

    NSArray *pathComponents = [NSArray arrayWithObjects:
                               [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject],
                               self.recordName, nil];

    NSURL *outputFileURL = [NSURL fileURLWithPathComponents:pathComponents];

    self.currentSession = [AVAudiosession sharedInstance];
    [self.currentSession setCategory:AVAudioSessionCategoryRecord error:nil];

    NSMutableDictionary *recordingSettings= [[NSMutableDictionary alloc] init];

    [recordingSettings setValue:[NSNumber numberWithInt:kAudioFormatLinearPCM] forKey:AVFormatIDKey];
    [recordingSettings setValue:[NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey];
    [recordingSettings setValue:[NSNumber numberWithInt: 2] forKey:AVNumberOfChannelsKey];
    [recordingSettings setValue:[NSNumber numberWithInt: 16] forKey:AVLinearPCMBitDepthKey];
    [recordingSettings setValue:[NSNumber numberWithBool: NO] forKey:AVLinearPCMIsBigEndianKey];
    [recordingSettings setValue:[NSNumber numberWithBool: NO] forKey:AVLinearPCMIsFloatKey];
    [recordingSettings setValue:[NSNumber numberWithInt: AVAudioQualityHigh] forKey:AVEncoderAudioQualityKey];

    recorder = [[AVAudioRecorder alloc] initWithURL:outputFileURL settings:recordingSettings error:NULL];
    recorder.delegate = self;
    recorder.meteringEnabled = YES;
    [recorder prepareToRecord];

录制后，我使用 MailCore 通过电子邮件发送声音，但文件为 0 字节。录制持续 30 秒后调用方法 [self stopRecording]

- (void) startRecording 

    if (!recorder.recording) 
        AVAudioSession *session = self.currentSession;
        [session setActive:YES error:nil];
        [recorder record];
        self.timer = [NSTimer scheduledTimerWithTimeInterval: 1.0 target:self selector:@selector(updateCountdown) userInfo:nil repeats: YES];
     else 
        [recorder stop];
    



- (void) stopRecording 

    [recorder stop];
    AVAudioSession *audioSession = [AVAudioSession sharedInstance];
    [audioSession setActive:NO error:nil];
    self.dictionaryWithRecords = (NSMutableDictionary *) @@"URL": recorder.url,
                                                           @"Name": self.recordName;

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^

        if ([[DBEmailSender sharedManager] emailAddress] != nil) 

            [[DBEmailSender sharedManager] sendMailWithAddress:[[NSUserDefaults standardUserDefaults] objectForKey:@"email"] andCode:nil andFilePath:[self.dictionaryWithRecords objectForKey:@"Name"]];

        
    );


- (void)updateCountdown 

    self.tick += 1;
    double seconds = fmod(self.tick, 60.0);

    if (seconds == 29) 
        self.tick = 0;
        seconds = 0;
        [self.timer invalidate];
        self.timer = nil;
        [self stopRecording];
    

这是我通过点击按钮播放我的声音：

- (void)playSoundFromPetal:(NSString *)soundName 

    SystemSoundID mySSID;
    NSString *path = [NSTemporaryDirectory() stringByAppendingPathComponent:soundName];
    AudioServicesCreateSystemSoundID((__bridge CFURLRef)[NSURL fileURLWithPath: path], &mySSID);
    AudioServicesPlaySystemSound(mySSID);

【参考方案1】：

这可能有很多原因 但就我而言， 已经有另一个对象使用 AVAudioSession 播放音频。

【讨论】：

那么您是如何从该对象中获取音频会话的？

@hyd00 好吧，我实际上意识到另一个对象的会话并不是真正必要的，所以我只是删除了它。但是你也可以试试： let sharedSession = AVAudioSession.sharedInstance() do try sharedSession.setCategory(AVAudioSessionCategoryRecord) try sharedSession.setActive(true) catch