Just use AUNewTimePitch (or whatever it’s called) by itself. That’ll change rate without changing pitch. And it can go more than double-speed (I think the limits are 1/32x to 32x)
Note that this unit is of type format converter, not effect, because you of the differing counts of input and output frames. —Chris > On Aug 18, 2017, at 8:41 AM, Waverly Edwards <[email protected]> wrote: > > Would someone provide some guidance on how you can take an audio file and > speed it up without changing the pitch. > I was working yesterday and I added AVAudioUnitVarispeed unit to my engine > and increased the speed by 2. It worked, however I found output to have the > chipmunk sound. > Would you use a AVAudioUnitTimePitch unit to lower the pitch to compensate or > is there a better way to achieve this outcome? > > I would like to increase the speed by more than a rate of 2. Is there a > reason why I couldn’t daisy chain two AVAudioUnitVarispeed units together? > > Lastly, is there a way to know how many audio frames were produced after the > effect completed. Since I have a change in time, the number of frames coming > in are not the same number going out. > > Thank you, > > > W. > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Coreaudio-api mailing list ([email protected] > <mailto:[email protected]>) > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/coreaudio-api/invalidname%40gmail.com > <https://lists.apple.com/mailman/options/coreaudio-api/invalidname%40gmail.com> > > This email sent to [email protected] <mailto:[email protected]>
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