Re: how to change pitch in real time
Re: how to change pitch in real time
- Subject: Re: how to change pitch in real time
- From: Brian Willoughby <email@hidden>
- Date: Thu, 13 Jan 2011 01:32:26 -0800
On Jan 13, 2011, at 00:38, Akram Ahmad wrote:
I want to change the pitch during playback of an audio file using a
"pitch slider". Actually, My app has an view with two sliders
namely Pitch and Tempo. I want to change the pitch and tempo when
audio is playing.
Could you please help me with some code snippet?
I have already gone through with MixerHost sample code on apple
site to play the audio file but not able to change the pitch during
playback.
I have not looked at the MixerHost sample, but if it uses AUGraph and
AudioUnits, then it would be very easy to add pitch changes.
AUVarispeed will change pitch and tempo together, like a physical
tape deck. Just hook up the PlaybackRate parameter to your slider
(and update the other slider to match).
AUTimePitch allows changing of playback rate independently from
pitch, using a pair of parameters.
Both of these AudioUnits are from Apple, and are included for free
with CoreAudio. On my ancient PowerPC machine, they only use about
3% to 6% of the CPU.
Brian Willoughby
Sound Consulting
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