Question

好的，所以我有一个应用程序，其中有许多练习视频，根本没有任何声音。

此外，在练习开始时，我会显示设备音乐播放器中的所有mp3文件，供用户选择音频文件。

但是，每当视频开始播放时，音乐播放器就会暂停。如何让它以音乐播放器继续播放和视频同时播放的方式工作。

对于视频，使用类 - MPMoviePlayerViewController

添加如下：

self.movieplayerController = [[MPMoviePlayerViewController alloc] initWithContentURL:urlStr];
self.movieplayerController.moviePlayer.controlStyle =  MPMovieControlStyleFullscreen;
self.movieplayerController.moviePlayer.fullscreen = YES;
self.movieplayerController.moviePlayer.view.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin;
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(movieFinishedCallback:) name:MPMoviePlayerPlaybackDidFinishNotification object:nil];
[self presentModalViewController:movieplayerController animated:YES];

对于音乐播放器，类是--- MPMusicPlayerController。

选择并播放音频如下：

 - (void)mediaPicker: (MPMediaPickerController *)mediaPicker didPickMediaItems:(MPMediaItemCollection *)mediaItemCollection
{
      [self dismissModalViewControllerAnimated: YES];

      [self.musicPlayer stop];

      [self.musicPlayer setQueueWithItemCollection:mediaItemCollection];

      [self.musicPlayer play];
}

编辑：

另外，尝试AVPlayer播放视频但没有成功！

代码如下：

AVPlayerItem *playerItem = [[AVPlayerItem alloc] initWithURL:urlStr];
AVPlayer *player = [[AVPlayer alloc] initWithPlayerItem:playerItem];

AVPlayerLayer *avPlayerLayer = [AVPlayerLayer playerLayerWithPlayer:player];

avPlayerLayer.frame = self.view.frame;
[self.view.layer addSublayer:avPlayerLayer];
[player play];

Answer 1

终于得到了答案......

适用于AVPlayer。

在问题中按上述方式对其进行初始化。

AVPlayerItem *playerItem = [[AVPlayerItem alloc] initWithURL:urlStr];
AVPlayer *player = [[AVPlayer alloc] initWithPlayerItem:playerItem];

AVPlayerLayer *avPlayerLayer = [AVPlayerLayer playerLayerWithPlayer:player];

avPlayerLayer.frame = self.view.frame;
[self.view.layer addSublayer:avPlayerLayer];
[player play];

但在此之前，在AppDelegate中，创建一个允许混音的AudioSession。

AudioSessionInitialize(NULL, NULL, NULL, NULL);  
UInt32 sessionCategory = kAudioSessionCategory_AmbientSound;
AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(sessionCategory), &sessionCategory);
UInt32 allowMixWithOthers = true;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryMixWithOthers, sizeof(allowMixWithOthers), &allowMixWithOthers);
AudioSessionSetActive(true);

从这里得到答案。

App with AVPlayer plays mp4 interrupt iPod music after launched

Answer 2

您可以将AudioToolbox用于此目的。我已经开发了一个小型演示（在阅读了你的问题之后）及其工作。

从此处下载MPMoviePlayerViewController的演示： - http://mobile.tutsplus.com/tutorials/iphone/mediaplayer-framework_mpmovieplayercontroller_ios4/

现在将任意.wav文件添加到您的捆绑包中。

现在修改此方法：

-(IBAction)playMovie:(id)sender
{
    UIButton *playButton = (UIButton *) sender; 

    NSString *filepath   =   [[NSBundle mainBundle] pathForResource:@"big-buck-bunny-clip" ofType:@"m4v"];
    NSURL    *fileURL    =   [NSURL fileURLWithPath:filepath];
    MPMoviePlayerViewController *moviePlayerController = [[MPMoviePlayerViewController alloc] initWithContentURL:fileURL];

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

    [moviePlayerController.view setFrame:CGRectMake(playButton.frame.origin.x, 
                                                    playButton.frame.origin.y, 
                                                    playButton.frame.size.width, 
                                                    playButton.frame.size.height)];

    [self.view addSubview:moviePlayerController.view];
    //moviePlayerController.fullscreen = YES;

    //moviePlayerController.scalingMode = MPMovieScalingModeFill;

    [moviePlayerController.moviePlayer play];

    NSString *soundPath = [[NSBundle mainBundle] pathForResource:@"test" ofType:@"wav"];

    SystemSoundID soundID;

    AudioServicesCreateSystemSoundID((CFURLRef)[NSURL fileURLWithPath: soundPath], &soundID);

    AudioServicesPlaySystemSound (soundID);

    [soundPath release];
}

它只是一个演示。希望它有助于进一步......

Answer 3

不幸的是，AudioSessionInitialize和朋友不推荐使用iOS7。现在使用AVAudioSession更容易混合。我使用audioSession对象作为全局 - 不确定如果它被解除分配会发生什么。如果它在堆栈中声明，AVPlayer肯定会匆忙放弃 - 所以要小心那个问题。

  _audioSession = [AVAudioSession sharedInstance];
  [_audioSession setCategory:AVAudioSessionCategoryAmbient error:&theError];

播放无声视频以及音乐应用程序播放歌曲

3 个答案: