iOS 录制语音消息的时候报错，couldn't get default input device
RT ，当我按下语音按钮的时候就报这个错，然后就挂了：不知道是缺少什么库吗 还是什么权限没有？希望懂的大神能指点一下，谢谢啦
2016-03-29 11:28:01.843 engineeringbrain[6743:103786] 11:28:01.843 WARNING: 40: ERROR: couldn't get default input device, ID = 0, err = 0!
2016-03-29 11:28:04.377 engineeringbrain[6743:103786] 11:28:04.377 WARNING: 803: The default input device 0x0 '(null)' has no input channels.
2016-03-29 11:28:05.817 engineeringbrain[6743:103695] 11:28:05.817 ERROR: 1066: AudioConverterNew returned -50
2016-03-29 11:28:05.818 engineeringbrain[6743:103695] 11:28:05.818 ERROR: 1066: AudioConverterNew returned -50
2016-03-29 11:28:05.818 engineeringbrain[6743:103695] 11:28:05.818 ERROR: 1066: AudioConverterNew returned -50
2016-03-29 11:28:05.818 engineeringbrain[6743:103695] 11:28:05.818 ERROR: 1066: AudioConverterNew returned -50
2016-03-29 11:28:05.818 engineeringbrain[6743:103695] 11:28:05.818 ERROR: 1066: AudioConverterNew returned -50
2016-03-29 11:28:05.818 engineeringbrain[6743:103695] 11:28:05.818 ERROR: 1066: AudioConverterNew returned -50
2016-03-29 11:28:05.834 engineeringbrain[6743:103695] -[EBChatViewController recordButtonTouchUpInside]
2016-03-29 11:28:05.835 engineeringbrain[6743:103786] 11:28:05.835 ERROR: 1066: AudioConverterNew returned -50
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donghai