[Audacity-nyquist] One problem with the attached plug-in

[David R. S. <dav...@sh...>]

Hi,

I have one problem with the attached plug-in I've been working on
for some time, Audio Chunker. it breaks an audio selection into
user-defined number of equal duration chunks, and moves those
chunks in time. Think of the beginning of each of those chunks as
being on a virtual spring, which can be extended so the chunks are
separated from each other by a duration of 1 chunk (shift time is
100%); lined up one after the other like the original selection
(0%); all starting at the same time, overlapping (-100%), and so on
down to -300%, at which point the last chunk from the original
selection is now the first chunk, with all chunks separated from
each other by 1 chunk duration of silence. Integer values from -300
to +100%, inclusive.

The problem is that when shift values become negative, there is
silence appended to the end of chunk audio. for instance, with a 4-
second sound broken into 4 chunks and a -200% shift, the resulting
audio is not only 4 seconds of audio, but 7 seconds: four chunks of
1 second duration, with 3 seconds unwanted silence appended after
that.

I've tried several things, including applying an extract-abs
function to the result (which I have commented out), but that
doesn't work either (with several equations to calculate the
resulting end or cutoff time). Besides which, I think if I need to
do that, I've done something inaccurate inside the make-chunk
function.

apart from the appended silence problem with negative shift values,
the audio chunks results are fine.

The code may look messy: while I'm writing code, I mark closing
parentheses so it's much easier for me to fix code, after which I
clean it up.

Thanks

David