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I am programming an audio App using AudioUnit and AVAudioSession, and AVAudioSession is initialized as:[[AVAudioSession sharedInstance] setCategory:audioSessionCategory withOptions:AVAudioSessionCategoryOptionAllowBluetoothA2DP | AVAudioSessionCategoryOptionMixWithOthers error:NULL];When a Bluetooth headset is connected, I am able to get the output latency by "AVAudioSession.sharedInstance().outputLatency".However, the value retrieved is still much smaller than the real Bluetooth audio latency.Also, I found that such a latency is actually changing over time, sometimes, within 1 min, the latency can change from 193ms to 260ms.I am wondering how can I query the accurate current Bluetooth audio output latency using API calls?If not possible, is there any way to lock the output latency to a safe value using Bluetooth audio? I do not care about the latency if it is measurable.Thanks