AVAudioSession 无法在 iOS 7 上播放

Posted 2023-02-25

【中文标题】AVAudioSession 无法在 iOS 7 上播放

【英文标题】：AVAudioSession Won't Play On iOS 7

【发布时间】：2013-09-12 13:09:59

【问题描述】：

在 ios 6 上，我已经能够设置一个 AVAudioSession 来播放 mp3 文件。在 iOS 7 中使用 Base 设置运行时，这不再有效。任何想法为什么这不起作用？该应用程序永远不会崩溃......它只是不播放 mp3。我已经验证了相同的代码和相同的 URL 可以在 iOS 6 应用程序上运行。

错误是：

ERROR:     185: Error creating aggregate audio device: 'what'
WARNING:   219: The input device is 0x31; 'AppleHDAEngineInput:1B,0,1,0:1'
WARNING:   223: The output device is 0x28; 'AppleHDAEngineOutput:1B,0,1,1:0'
ERROR:     398: error 'what'
_itemFailedToPlayToEnd: 
    kind = 1;
    new = 2;
    old = 0;

代码：

- (void)viewDidLoad 
    AVAudioSession *audioSession = [AVAudioSession sharedInstance];

    NSError *setCategoryError = nil;
    [audioSession setCategory:AVAudioSessionCategoryPlayback error:&setCategoryError];

    if (setCategoryError)  /* handle the error condition */ 

    NSError *activationError = nil;    
    [audioSession setActive:YES error:&activationError];

    if (activationError)  /* handle the error condition */ 

    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];   
    [self becomeFirstResponder];    

    NSURL *newURL = [NSURL URLWithString:_entry.articleUrl];
    self.player = [[MPMoviePlayerController alloc] initWithContentURL: newURL];
    [player prepareToPlay];
    player.allowsAirPlay = YES;
    player.scalingMode = MPMovieScalingModeAspectFit;    
    player.view.frame = self.view.frame;
    [self.view addSubview: player.view];
    [self.player setFullscreen:YES animated:YES];

    [[NSNotificationCenter defaultCenter] addObserver:self
                               selector:@selector(movieFinishedCallback:)
                                   name:MPMoviePlayerPlaybackDidFinishNotification
                                 object:player];

    [[NSNotificationCenter defaultCenter] addObserver:self
                               selector:@selector(exitedFullscreen:) 
                                   name:MPMoviePlayerDidExitFullscreenNotification 
                                 object:player];

    [[NSNotificationCenter defaultCenter] addObserver:self 
                               selector:@selector(playbackStateChanged:) 
                                   name:MPMoviePlayerPlaybackStateDidChangeNotification 
                                 object:player];
    [player play];

    [super viewDidLoad];   

【问题讨论】：

为set Active添加日志语句：NSError *activationError = nil; if ([audioSession setActive:YES error:&activationError] ) NSLog(@"Audiosession errore: %@", error)

@rckoenes 我刚刚在原始帖子中添加了错误和警告消息日志。

类似问题：***.com/questions/19104728/… 和 ***.com/questions/19088955/…。你的文件名有空格吗？

【参考方案1】：

尝试使用

NSURL *newURL = [NSURL fileURLWithPath:_entry.articleUrl];

而不是

NSURL *newURL = [NSURL URLWithString:_entry.articleUrl];