modify playingRate with AVAudioEngine, AVAudioPlayerNode

 

AVAudioNode
↑
AVAudioUnit
↑
AVAudioUnitTimeEffect
↑
AVAudioUnitVarispeed(only rate), AVAudioUnitTimeEffect(pitch, overlap, rate)

 

AVAudioUnitVarispeed 를 사용해보자

AVAudioPlayer → AVAudioUnitVarispeed → mainMixerNote

형태로 구성하면, AVAudioUnitVarispeed.rate 을 조종해서 재생속도를 조정할 수 있다.

 

ref. stackoverflow