iphone - 使用音频队列处理中断

我正在开发一个音频流媒体，并声明了一个中断监听器，以便在发生中断(例如来电或短信)时保存歌曲的状态。

这是相关代码

在我的 AppDelegate 中，我有这个

AudioSessionInitialize (NULL, NULL, interruptionListenerCallback, self);
AudioSessionSetActive(YES);

这就是中断监听器的样子

void interruptionListenerCallback (void *inUserData, UInt32 interruptionState) {
// This callback, being outside the implementation block, needs a reference 
//to the AudioPlayer object
MyPlayer *player = (MyPlayer *)inUserData;

if (interruptionState == kAudioSessionBeginInterruption) {
    if ([player audioStreamer]) {
        // if currently playing, pause
        [player pausePlayback];
        player.interruptedOnPlayback = YES;
    }

} else if ((interruptionState == kAudioSessionEndInterruption) && player.interruptedOnPlayback) {
    // if the interruption was removed, and the app had been playing, resume playback
    [player resumePlayback];
    player.interruptedOnPlayback = NO;
}

}

当我接到电话时，会调用中断监听器，如果用户拒绝接听电话，还会调用播放恢复方法。但是在调用resumePlayback方法之前，我在AudioQueueEnqueueBuffer的控制台中收到此错误