Swift - How to remove delay when recording audio using AVFoundation

Question

I'm using an app that records audio and streams it to another user. It's basically a VoIP call. The problem I'm running into is that the audio I'm streaming to the peer is delayed by about 0.5 seconds. This is quite noticeable, and a little annoying when you both try to talk at the same time.

I'm wondering if this is common among AVFoundation's AVAudioEngine, or if possibly it's something to do with the way I set it up.

I can include source code if this is NOT a known problem with AVAudioEngine, otherwise can you please suggest the best route to record audio with the least delay?

I would also prefer something that is fairly high-level, and compatible with swift 3/3.1. However, if there is not a solution that meets these needs, then recommend the tool you think seems best fit.

Thank you!

Answer 1

确保使用最小支持的bufferSize（100 ms）或（sampleRate * 0.1）样本调用“AVAudioEngine.inputNode.installTap”函数。