Question

我的应用程序使用AVPlayer播放mp4，当我的应用程序完成启动时，它会中断iPod音乐，虽然我已将音频会话设置为允许与其他人混音

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

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

视图控制器确实出现后，我重新启动iPod音乐，它可以正常使用我的应用程序而不会中断，我的应用程序不会再打断音乐了。

有谁知道问题是否可以解决？我还检查了myapp-info.plist，找不到属性以防止中断iPod。

所有AudioSession方法都不会返回任何错误。

这是iPhoneConfigureUtility中的日志：

Aug 20 10:55:54 nova-teki-iPhone audiotest[3510] <Warning>: AudioSessionInitialize status = 0
Aug 20 10:55:55 nova-teki-iPhone kernel[0] <Debug>: ALS: kIOHIDDisplayBrightnessSliderPositionKey=69% (0xb226)
Aug 20 10:55:55 nova-teki-iPhone audiotest[3510] <Warning>: AudioSessionSetActive status = 0
Aug 20 10:55:55 nova-teki-iPhone audiotest[3510] <Warning>: kAudioSessionProperty_AudioCategory status = 0
Aug 20 10:55:55 nova-teki-iPhone audiotest[3510] <Warning>: kAudioSessionProperty_OverrideCategoryMixWithOthers status = 0
Aug 20 10:55:56 nova-teki-iPhone audiotest[3510] <Error>: [10:55:56.005] FigSubtitleSampleCreateFromPropertyList signalled err=50 (kFigCFBadPropertyListErr) (NULL or bad plist) at /SourceCache/EmbeddedCoreMedia/EmbeddedCoreMedia-1033.6/BuildSystem/XcodeProjects/MediaToolbox/../../../Sources/../Prototypes/ClosedCaptions/FigCaptionCommand.c line 762
Aug 20 10:55:56 nova-teki-iPhone audiotest[3510] <Warning>: Application windows are expected to have a root view controller at the end of application launch

以下是我的测试程序：

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

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(itemDidPlayToEndTime:)
                                             name:AVPlayerItemDidPlayToEndTimeNotification
                                           object:nil];

self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
// Override point for customization after application launch.
playerView = [[MoviePlayerView alloc] initWithFrame:self.window.bounds];
AVPlayer *player = [AVPlayer playerWithURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"sunny" ofType:@"mp4"]]];
player.actionAtItemEnd = AVPlayerActionAtItemEndNone;
[player play];
[(AVPlayerLayer *)playerView.layer setPlayer:player];
[self.window addSubview:playerView];
[playerView release];

self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;

Answer 1

在iOS 6/7中，您可以使用AVAudioSession，因为不推荐使用AudioSessionSetProperty。

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback withOptions:AVAudioSessionCategoryOptionMixWithOthers error:nil];

Answer 2

最后，我弄清楚出了什么问题。

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);

必须在AudioSessionSetProperty之后调用AudioSessionSetActive，它现在可以正常工作。

应用AVPlayer播放后播放mp4中断iPod音乐

2 个答案: