在静音模式下播放电影的音频吗？

Question

很抱歉我的问题，但我已经实现了一个介绍视频，尽管我的iPad的硬件静音开关，音频正在播放。我还在我的应用程序中使用AVAudioplayer，只是为了播放简短的声音样本。在这个类中，它是我设置"AVAudioSessionCategory“的唯一区域。但是对于所有的音频播放，没有什么可听的。这只是我的介绍视频。

有什么帮助吗?如何修复“音频错误”，使电影播放器是静音的？谢谢你

这是我的音频类：

- (id)initWithSoundfileName:(NSString*) file 
{
    if ((self = [super init]))
    {
        NSString* filename =       [file stringByDeletingPathExtension];
        NSString* fileextension =  [file pathExtension];

        // get file path from bundle
        NSString *soundFilePath = [[NSBundle mainBundle] pathForResource: filename ofType: fileextension];
        NSLog(@"AudioPlayer init: %@", soundFilePath);

        NSURL* fileurl = [[NSURL alloc] initFileURLWithPath:soundFilePath];
        NSError* error = nil;

        AVAudioPlayer* audioplayer = [[AVAudioPlayer alloc] initWithContentsOfURL:fileurl error:&error ];
        if (error) { NSLog(@"Error creating AVAudioPlayer %@", [error description]);}

        // set audio policy
        [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryAmbient error:NULL];

        self.player =  audioplayer;
        [self.player prepareToPlay];
        [self.player setDelegate:self];
    }
    return self;

}
-(void) play{
    [self.player play];
}

下面是我的视频回放方法：

- (void)playIntroVideo
{    
    NSString *movpath = [[NSBundle mainBundle] pathForResource:@"mymovie" ofType:@"mp4"];

    NSURL *fileURL    =   [NSURL fileURLWithPath:movpath];  
    self.moviePlayerController = [[MPMoviePlayerController alloc] initWithContentURL:fileURL]; 
    self.moviePlayerController.fullscreen = YES;
    self.moviePlayerController.scalingMode = MPMovieScalingModeAspectFit;
    self.moviePlayerController.controlStyle = MPMovieControlStyleNone;
    self.moviePlayerController.movieSourceType = MPMovieSourceTypeFile;

    self.moviePlayerController.useApplicationAudioSession = NO;     
    [self.moviePlayerController.view setFrame: self.view.bounds];   

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlayBackComplete:)  
                                                 name:MPMoviePlayerPlaybackDidFinishNotification  
                                               object:self.moviePlayerController];  


    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlaybackStateChanged:)  
                                                 name:MPMoviePlayerPlaybackStateDidChangeNotification  
                                               object:self.moviePlayerController];  

    [self.view addSubview:self.moviePlayerController.view];

    [self.moviePlayerController prepareToPlay];
    [self.moviePlayerController play];
}

Answer 1

就像@Till提到的那样:当我将MoviePlayerController属性更改为useApplicationAudioSession=TRUE时，它会修复我的问题。音频播放处于静默状态。