Re: [linux-audio-dev] How hard is it to write a pitch shifter?

[Cournapeau David]

Erik de Castro Lopo wrote:

But I cant find out how to deal with the missing data that is removed - to
keep the original length. 
   

Changing the pitch without changing the length is true pitch shifting. The
code and concepts required to do this well is extremely complicated.
 

To do it well is difficult, but the basic stuff is really simple, if you 
have a library to do sample-rate conversion: doing the time scale 
compression/expansion
with the simplest method (overlapp add) is just a matter of buffering. 
It will sound awful, of course !

David