iOS - 使用 AVAudioRecorder 录制音频失败且没有错误

Question

我遇到了这个问题，因为 AVAudioRecorder 不适合我，至少从我能看到（或听不到）的情况来看。

我的目标是带有 ARC 的 iOS 5。

我确实设置了错误对象，但没有一个被解雇，所以我想我在这里做错了什么。

这是我设置 AVAudioRecorder 的部分：

NSArray *dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docsDir = [dirPaths objectAtIndex:0];
NSString *soundFilePath = [docsDir stringByAppendingPathComponent:currentTrack.trackFileName];

currentTrack.trackFileURL = [NSURL fileURLWithPath:soundFilePath];

NSLog(@"Chemin : %@", currentTrack.trackFileURL.path);

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

[recordSetting setValue :[NSNumber numberWithInt:kAudioFormatLinearPCM] forKey:AVFormatIDKey];
[recordSetting setValue:[NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey]; 
[recordSetting setValue:[NSNumber numberWithInt: 2] forKey:AVNumberOfChannelsKey];

[recordSetting setValue :[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
[recordSetting setValue :[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsBigEndianKey];
[recordSetting setValue :[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsFloatKey];


currentTrack.trackRecordSettings = recordSetting;


NSError *err = nil;


//[audioSession setDelegate:self];
if(err){
    NSLog(@"audioSession: %@ %d %@", [err domain], [err code], [[err userInfo] description]);
    return;
}
[[AVAudioSession sharedInstance] setActive:YES error:&err];
err = nil;
if(err){
    NSLog(@"audioSession: %@ %d %@", [err domain], [err code], [[err userInfo] description]);
    return;
}
err = nil;
recorder = [[AVAudioRecorder alloc]
                 initWithURL:currentTrack.trackFileURL
                 settings:currentTrack.trackRecordSettings
                 error:&error];

if (err)
{
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @"Warning"
                               message: [err localizedDescription]
                              delegate: nil
                     cancelButtonTitle:@"OK"
                     otherButtonTitles:nil];
    [alert show];
    NSLog(@"error: %@", [error localizedDescription]);

} else {
    [recorder setDelegate:self];
    [recorder prepareToRecord];

    BOOL audioHWAvailable = [[AVAudioSession sharedInstance]inputIsAvailable ];
    if (!audioHWAvailable) {
        UIAlertView *cantRecordAlert =
        [[UIAlertView alloc] initWithTitle: @"Warning"
                                   message: @"Audio input hardware not available"
                                  delegate: nil
                         cancelButtonTitle:@"OK"
                         otherButtonTitles:nil];
        [cantRecordAlert show]; 
        return;
    }
}

这里没有报错

那么什么时候开始录制呢：

-(void)startRecordingAudio{
    NSLog(@"Start recording");
    [[AVAudioSession sharedInstance] setCategory :AVAudioSessionCategoryRecord error:nil];
    [recorder record];
}

然后是时候停止录制了：

-(void)stopRecordingAudio{
    NSLog(@"Stop recording");
    [recorder stop];
    NSError *err;
    NSData *audioData = [NSData dataWithContentsOfFile:currentTrack.trackFileURL.path options: 0 error:&err];
    if(!audioData)
        NSLog(@"audio data error: %@ %d %@", [err domain], [err code], [[err userInfo] description]);
    NSLog(@"%d", audioData.length);
    }

audioData 长度始终为 4096 是否正常？如果我理解正确的话，大约是 93 毫秒的声音......

最后，是时候播放录制的声音了：

-(void)startPlayingAudio{
    [[AVAudioSession sharedInstance] setCategory :AVAudioSessionCategoryPlayback error:nil];

    NSLog(@"Start playing");
    NSError *error;
    if(player == nil){
        player = [[AVAudioPlayer alloc] initWithContentsOfURL:currentTrack.trackFileURL    
        error:&error];                                                                           
    }


    player.delegate = self;

    if (error)
        NSLog(@"Error: %@", 
              [error localizedDescription]);
    else
        [player  play];
}

我确实设置了永远不会触发的委托方法：

-(void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag
{
   NSLog (@"audioRecorderDidFinishRecording:successfully:");
}
-(void)audioPlayerDecodeErrorDidOccur:(AVAudioPlayer *)player error:(NSError *)error
{
    NSLog(@"Decode Error occurred");
}
-(void)audioRecorderDidFinishRecording:(AVAudioRecorder *)recorder successfully:    (BOOL)flag
{
    NSLog (@"audioRecorderDidFinishRecording:successfully: %d", flag);
}
-(void)audioRecorderEncodeErrorDidOccur:(AVAudioRecorder *)recorder error:(NSError *)error
{
    NSLog(@"Encode Error occurred");
}
-(void)beginInterruption{
    NSLog(@"INTERRUPT");
}

另外，我确实看到 .caf 文件在我的应用程序文件夹中正确创建。

感谢您提供的任何帮助。至于现在我听不到录制的声音，我使用没有耳机的 iPhone 4 设备进行测试。

Answer 1

发现问题： 在 prepareRecord 之前调用记录。由于我使用 viewDidAppear 来设置录制，因此在视图可见之前调用了开始录制...

我确实使用了 viewDidAppear，因为我不使用 initWithNib，所以没有调用 viewDidLoad。我试图覆盖 loadView，但我发现的所有示例都不太清楚主题，并且从未调用 loadView。也许有人可以指出我正确的方向？尽管如此，我还是能在 iPhone 上听到我的声音！

感谢您的宝贵时间。