iPhone不会播放音频文件

Question

我正在尝试制作一个录音应用程序，所以显然我需要能够录制和播放音频文件。看起来它正在工作，根本没有错误，但它不会工作。我不确定它是否真的在录制？

它应该自己创建声音文件，对吗？我不必将声音文件放入项目中吗？

- (void)viewDidLoad
{
    [super viewDidLoad];

    playButton.enabled = NO;
    stopButton.enabled = NO;

    NSArray *dirPaths;
    NSString *docsDir;

    dirPaths = NSSearchPathForDirectoriesInDomains(
                                                   NSDocumentDirectory, NSUserDomainMask, YES);
    docsDir = [dirPaths objectAtIndex:0];
    NSString *soundFilePath = [docsDir
                               stringByAppendingPathComponent:@"sound.caf"];

    NSURL *soundFileURL = [NSURL fileURLWithPath:soundFilePath];

    NSDictionary *recordSettings = [NSDictionary 
                                    dictionaryWithObjectsAndKeys:
                                    [NSNumber numberWithInt:AVAudioQualityMin],
                                    AVEncoderAudioQualityKey,
                                    [NSNumber numberWithInt:16], 
                                    AVEncoderBitRateKey,
                                    [NSNumber numberWithInt: 2], 
                                    AVNumberOfChannelsKey,
                                    [NSNumber numberWithFloat:44100.0], 
                                    AVSampleRateKey,
                                    nil];

    NSError *error = nil;

    audioRecorder = [[AVAudioRecorder alloc]
                     initWithURL:soundFileURL
                     settings:recordSettings
                     error:&error];

    if (error)
    {
        NSLog(@"error: %@", [error localizedDescription]);

    } else {
        [audioRecorder prepareToRecord];
    }

}

// Methods called by the start recording button, stop recording, and play.
-(void) recordAudio
{
    if (!audioRecorder.recording)
    {
        playButton.enabled = NO;
        stopButton.enabled = YES;
        [audioRecorder record];
    }
}
-(void)stop
{
    stopButton.enabled = NO;
    playButton.enabled = YES;
    recordButton.enabled = YES;

    if (audioRecorder.recording)
    {
        [audioRecorder stop];
    } else if (audioPlayer.playing) {
        [audioPlayer stop];
    }
}
-(void) playAudio
{
    if (!audioRecorder.recording)
    {
        stopButton.enabled = YES;
        recordButton.enabled = NO;

        NSError *error;

        audioPlayer = [[AVAudioPlayer alloc] 
                       initWithContentsOfURL:audioRecorder.url                                    
                       error:&error];

        audioPlayer.delegate = self;

        if (error)
            NSLog(@"Error: %@", 
                  [error localizedDescription]);
        else {
            [audioPlayer setVolume:1.0];
            [audioPlayer play];
        }
    }
}

// Delegate methods

-(void)audioPlayerDidFinishPlaying:
(AVAudioPlayer *)player successfully:(BOOL)flag
{
    recordButton.enabled = YES;
    stopButton.enabled = NO;

    NSLog(@"did play");
}
-(void)audioPlayerDecodeErrorDidOccur:
(AVAudioPlayer *)player 
                                error:(NSError *)error
{
    NSLog(@"Decode Error occurred");
}
-(void)audioRecorderDidFinishRecording:
(AVAudioRecorder *)recorder 
                          successfully:(BOOL)flag
{
    NSLog(@"did record");
}
-(void)audioRecorderEncodeErrorDidOccur:
(AVAudioRecorder *)recorder 
                                  error:(NSError *)error
{
    NSLog(@"Encode Error occurred");
}

提前致谢。我对整个录音和处理音频文件和目录非常陌生。

Answer 1

尝试添加 AVAudioSession 代码如下..

NSError *error; 

AVAudioSession * audioSession = [AVAudioSession sharedInstance];

[audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error: &error];

[audioSession setActive:YES error: &error];