播放声音的序列中的背景AVAudioPlayer [英] Playing sequence of sounds in background with AVAudioPlayer
问题描述
我想播放声音的序列与 AVAudioPlayer
。所有的都在前景好,但在后台我有问题。
I want to play sequence of sounds with AVAudioPlayer
. All are ok in foreground, but in background I have issues.
调度音未来它在背景,但声音的初始化后,下次故障后
After scheduling next sound it plays in background, but initialisation of sound after next fails.
如何解决这个问题?
其实,我有声音的序列和启动的时刻序列。当用户触控按键应用程序启动时播放声音。
In fact, I have sequence of sounds and sequence of starting moments. When user touch button application starts play sounds.
我用下面的code:
- (void)soundScheduleNext
{
NSURL * url = ...; // get url of next sound file
if (soundPlayer == nil)
soundPlayer = [AVAudioPlayer alloc];
soundPlayer = [soundPlayer initWithContentsOfURL:url error:nil];
soundPlayer.delegate = self;
AVAudioSession * audioSession = [AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
// if this is a first element of sound sequence...
if (soundSeqNext == 0)
{
// ... play right now
[soundPlayer prepareToPlay];
soundStartMoment = [soundPlayer deviceCurrentTime];
[soundPlayer play];
} else {
BOOL prepareToPlayOk = [soundPlayer prepareToPlay];
// when second element of sequence play - prepareToPlayOk is YES; when third - prepareToPlayOk is NO :(
NSLog(@"soundScheduleNext: prepareToPlayOk = %d", (int)prepareToPlayOk, nil);
NSTimeInterval timeMoment = ... ; // get moment of time for next sound
[soundPlayer playAtTime:timeMoment];
}
soundSeqNext++;
}
- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag
{
[self soundScheduleNext];
}
audioPlayerDidFinishPlaying
函数被调用完成声音播放结束后的每一次。
audioPlayerDidFinishPlaying
function is called every time after end of sound playback finished.
推荐答案
在音频会话设置类别下面这行解决了这个问题:
The following line after audio session setting category solves the problem:
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
在 http://stackoverflow.com/a/8071865/13441
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