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how do I synchronize playback to AVAudioRecorder start record time? Can I assume AVAudioRecorder uses the clock from CMClockGetHostTimeClock? CMTime referenceTime = CMTimeAdd(CMClockGetTime(self.player.masterClock), CMTimeMakeWithSeconds(2, NSECPERSEC)); //start playback and record 2 seconds after.         [self.player setRate:1.0 time:kCMTimeZero atHostTime:referenceTime];     CMTime syncPTS = CMSyncConvertTime(referenceTime, self.player.masterClock, CMClockGetHostTimeClock());     [self.audioRecorder recordAtTime:CMTimeGetSeconds(syncPTS) forDuration:30]; //audioRecorder is an instance of AVAudioRecorder

Is this how you would calculate the total roundtrip latency as you described with AVAudioSession? ([AVAudioSession sharedInstance].IOBufferDuration + [AVAudioSession sharedInstance].inputLatency + [AVAudioSession sharedInstance].outputLatency);My understanding is that both inputLatency and outputLatency accounts for device and stream latency. I can find how to get the input and output safety offsets in iOS. Also, should add the IOBufferDuration twice for the roundtrip? One for output and one for input?

How do you get the safety offsets on iOS? I have searched everywhere.