I have a video chat app, On my iPhone 5s, when in video chat, once GSM phone call come in, the Xcode always print out a log:
2013-12-17 14:50:00.826 xxxxx[2485:780f] 14:50:00.826 ERROR:
[0xad85000] AVAudioSessionPortImpl.mm:50: ValidateRequiredFields: Unknown selected data source for Port iPhone 麦克风 (type: MicrophoneBuiltIn)
which only happen on iPhone5' device, and my iPhone4s has no such problem, does someone know what this log meaning, and how to fix it.