How to apply echo effect recorded file? - objective-c

Question

I want record and play same time. When play sound, how to apply echo effect? How to use AudioQueue? Can anyone help me out how can I achieve this. Thanks

Answer 1

There is a good example on how to record and play at the same time here: https://developer.apple.com/library/mac/samplecode/CAPlayThrough/Introduction/Intro.html

This example also shows you how to apply an echo effect: https://developer.apple.com/librarY/mac/samplecode/AVCaptureToAudioUnitOSX/Introduction/Intro.html