Re: How do I change playback speed using coreaudio api?
Re: How do I change playback speed using coreaudio api?
- Subject: Re: How do I change playback speed using coreaudio api?
- From: Alberto Ricci <email@hidden>
- Date: Mon, 26 Aug 2002 10:17:15 +0200
Rick,
and then plays it. I would like to add a simple slider control to the UI to
allow me to change the playback speed in real time without changing the
pitch. Do I need to use FFT code or can I simply change the data in the
buffer that I feed to the callback routines in the AudioConverter and
You need some time scaling code in order to change the playback speed
of audio without affecting the pitch. That functionality is not
present in CoreAudio as it is now.
There are numerous methods to do time scaling (or pitch shifting,
which is roughly the same problem), most of which involve some FFT
code and overlap-add operations... you should check out the Music-DSP
FAQ and code archives at
http://shoko.calarts.edu/musicdsp/
Best,
Alberto
Riccisoft
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