Hi!
> Does anyone know a good technic/routine to time-stretch a buffer of
> audio data (mono channel) ?
In the case you want to replay the audio data at a different sampling rate
WITH changing the duration of the sound accordingly to the ratio of
original sampling rate and new sampling rate you should give following article a
chance (about bandlimited interpolation):
http://ccrma-www.stanford.edu/~jos/Interpolation/
In the case you want to change the sampling frequency WITHOUT changing the
duration of the sound (or changing the sound duration without following the
ratio of original to replay sampling rate) the following link is a good
point for information (incl. source code):
http://www.dspdimension.com/html/pscalestft.html
have fun
markf
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