How can I play a sound file with varying pitch in iOS device programmatically

Question

I have a heart beat sound file. I would like to play it on increasing pitch as a user waits for a time interval to finish. Can anyone tell me how to do this in iOS ?

Answer 1

You may want to see: Real-time Pitch Shifting on the iPhone

That article references dirac3d, but CoreAudio also now has this capability but it's non-trivial to setup. Chris Adamson has written some good articles on CoreAudio that would probably be helpful.

Answer 2

当前版本的iOS包括内置的NewTimePitch音频单元，可用于独立增加音调或播放时间。