ios - iPhone-播放电影后，播放音频效果不佳

Question

在我的应用程序中，当应用程序启动时，我正在播放介绍视频。在应用程序的稍后部分，我将在单击按钮时播放一些音频文件。但是音频不能很好地播放。注意到其消声和有时音频不足等问题。

我发现错误在于播放视频。当我不播放介绍视频时，音频播放良好。否则会造成麻烦。

我正在使用以下代码来设置电影播放器​​:

-(void)setupMovie
{
    NSString* moviePath;
    if ([[UIDevice currentDevice] userInterfaceIdiom] ==  UIUserInterfaceIdiomPad)
    {
        moviePath = [[NSBundle mainBundle] pathForResource:@"ipad" ofType:@"3gp"];
    }
    else 
    {
        moviePath = [[NSBundle mainBundle] pathForResource:@"iphone" ofType:@"3gp"];    

    }

    NSURL* movieURL = [NSURL fileURLWithPath:moviePath];
    playerCtrl =  [[MPMoviePlayerController alloc] initWithContentURL:movieURL];

    if ([[UIDevice currentDevice] userInterfaceIdiom] ==  UIUserInterfaceIdiomPad)
    {
        playerCtrl.view.frame = CGRectMake(0, 0, 1024, 768);
    }
    else 
    {
        playerCtrl.view.frame = CGRectMake(0, 0, 480, 320);     
    }


    playerCtrl.scalingMode = MPMovieScalingModeFill;
    playerCtrl.controlStyle = MPMovieControlStyleNone;
    [playerCtrl prepareToPlay];

    [[NSNotificationCenter defaultCenter] addObserver:self 
                                             selector:@selector(moviePlayerLoadStateChanged:) 
                                                 name:MPMoviePlayerLoadStateDidChangeNotification 
                                               object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self 
                                             selector:@selector(moviePlayBackDidFinish:) 
                                                 name:MPMoviePlayerPlaybackDidFinishNotification 
                                               object:nil];
}

- (void) moviePlayerLoadStateChanged:(NSNotification*)notification 
{
    if ([playerCtrl loadState] != MPMovieLoadStateUnknown)
    {
        [[NSNotificationCenter  defaultCenter] removeObserver:self 
                                                         name:MPMoviePlayerLoadStateDidChangeNotification 
                                                       object:nil];



        // Play the movie
        [self.view addSubview:playerCtrl.view];
        [playerCtrl play];

        [[NSNotificationCenter defaultCenter] postNotificationName:@"GSPLAYER_STARTED" object:nil];
    }
    else 
    {
        NSLog(@"Player received unknown error");
        [[NSNotificationCenter defaultCenter] postNotificationName:@"GSPLAYER_ERROR" object:nil];
    }
}

电影播放完后，我将按以下方式加载下一个 View :

-(void)playerCompleted
{
    [pv.view removeFromSuperview];
    [pv release];
    pv = nil;
    [self.window addSubview:navigationController.view];
}

以下代码用于播放音频:

-(void)playAudio:(NSString*)filename
{
    self.allowAnimation = NO;
    NSString* bundleName = [[NSBundle mainBundle] pathForResource:[filename lowercaseString] ofType:nil];

    //NSURL* url = [[NSURL alloc] initFileURLWithPath: bundleName];
    NSURL* url = [NSURL fileURLWithPath:bundleName];

    if (appSoundPlayer) {
        [appSoundPlayer release];
    }

    appSoundPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error: nil];
    //[appSoundPlayer prepareToPlay];
    [appSoundPlayer setVolume: 1.0];
    [appSoundPlayer setDelegate: self];
    [appSoundPlayer play];  
}

有人较早遇到过此类问题吗？可能是什么问题，将是解决方案？

Answer 1

您是否尝试过设置audioSession属性。仅在播放音频之前将Audiosession设置为要播放。我没有尝试过此代码，但是我认为 session 存在问题。

appSoundPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error: nil];
//[appSoundPlayer prepareToPlay];
[appSoundPlayer setVolume: 1.0];
[appSoundPlayer setDelegate: self];
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];
[appSoundPlayer play]