在背景中在iPhone上播放mp3 - AudioQueue:错误

时间:2011-02-17 00:25:17

标签: iphone background audio mp3

您好 我正在开发一个应用程序,在5分钟的循环播放不同的缓冲mp3。 当应用程序在前台运行或在iphone待机模式下运行时,它可以正常播放,但是当我尝试时 在后台,但它给了我这个错误:

Thu Feb 17 00:05:06 unknown mediaserverd [2303]:00:05:06.158 AudioQueue:AudioSessionSetClientPlayState(3582)中的错误-12985 2月17日星期四00:05:06未知mediaserverd [2303]:00:05:06.167 AudioQueue:来自AudioSessionSetClientPlayState的错误-12985(3582)

更多信息:当我在cicle中播放缓冲的mp3(第一个关闭corse)时,它可以很好地播放背景。我也尝试将缓冲的mp3数据保存到mp3文件然后播放,但这是同样的问题。 我搜索了这个错误,但没有找到相关信息。

提前致谢。

有(我认为)相关代码:

-(void) prepareAudio {
    // Registers this class as the delegate of the audio session.
    [[AVAudioSession sharedInstance] setDelegate: self];

    // The AmbientSound category allows application audio to mix with Media Player
    // audio. The category also indicates that application audio should stop playing 
    // if the Ring/Siilent switch is set to "silent" or the screen locks.
    [[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryAmbient error: nil];

    // Use this code instead to allow the app sound to continue to play when the screen is locked.
    [[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryPlayback error: nil];

    UInt32 doSetProperty = 0;
    AudioSessionSetProperty (kAudioSessionProperty_OverrideCategoryMixWithOthers,
                             sizeof (doSetProperty),
                             &doSetProperty
                             );

    /*UInt32 category = kAudioSessionCategory_AmbientSound;
    OSStatus result = AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(category), &category);
    */
    // Activates the audio session.

    NSError *activationError = nil;
    [[AVAudioSession sharedInstance] setActive: YES error: &activationError];
}


- (void)finishedReceivingData:(NSData *)data {  
    if(data == nil) {
        NSLog(@"cdata nil");
        return;
    }
    if (player != nil) {
        [player release];
        player = nil;
    }

    player = [[AVAudioPlayer alloc] initWithData:data error: nil];
    [player setVolume:0.1];     
    [player play];
}

0 个答案:

没有答案
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