AudioQueueServices录音时AudioQueueStart失败OSStatus-50

参考链接http://www.cnblogs.com/cocoajin/p/5660621.html

指定AudioSession后不要忘记设置cate

AVAudioSession *session = [AVAudioSession sharedInstance];
[session setCategory: AVAudioSessionCategoryPlayAndRecord error:nil];
[session setActive: YES error:nil];