[Audacity-devel] Some neat new patches

[D. <du...@ya...>]

Hello audacity-devel,

I've gotten into hardcore hax0ring mode and have
cranked out 2 new effects and 1 bugfix for Audacity!

pa_unix_oss.c.patch:
A day or 2 ago, I submitted a report of a compile time
error on my debian 2.2r6 system. This patch fixes it.

Phonograph:
This effect makes the selection sound somewhat like a
33 1/3 LP record, adding pops/crackles. Kinda neat.
Might be useful for fooling your friends.

TimeStretch:
This is easily the most involved patch. It changes the
length of the sample using a SOLA (Synchronize
Overlap-Add) algorithm, which was easy to do: It's the
same algorithm for scaling sprites in games. It uses
the Clear() and InsertSilence() functions of the
WaveTrack class to actually change the length of the
sample. Even cooler yet: It experimentally supports
Pitch Scaling, so you can slow or speed up your sample
without changing the pitch! It uses smsPitchScale.cpp
by Stephan M. Sprenger, but the code is covered under
the Wide Open Licence, so you can relicence it under
the GPL. smsPitchScale uses a STFT (Slow Time Fourier
Transform). Right now it's hella slow, but it works.
Check it out. Oh, read the comments at the top of the
patch file for a short TODO list.

All 3 of these patches can be found here:
http://www.hcsw.org/audacity/

Instructions on applying the patches are found in the
comments at the top of the respective patch files.

All these patches are GPLed. Incorporate them if you
like, although they might need a bit more work.

I'm going to keep hacking too. There's a lot of
features in Steinberg's WaveLab that I'd like to see
in a Free Software program!

Great program!

Doug Hoyte

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