[Audacity-quality] snd-avg function crashes Audacity if stepsize > blocksize

[Steve t. F. <ste...@gm...>]

This is not a new bug, and I'm not 100% sure if it really is a bug, but 
according to the Nyquist manual:


(snd-avg sound blocksize stepsize operation)
    Computes the averages or peak values of blocks of samples. Each 
output sample is an average or peak of blocksize (a fixnum) adjacent 
samples from the input sound. After each average or peak is taken, the 
input is advanced by stepsize, a fixnum which may be greater or less 
than blocksize.
http://www.audacity-forum.de/download/edgar/nyquist/nyquist-doc/manual/part6.html#index494

However, if "stepsize" is greater than "blocksize", Audacity crashes.

Example of how to reproduce:

In the Nyquist prompt box, enter the following code (according to the 
above manual reference this is valid code) and apply it to a mono track 
selection.

|(let
   ((blocksize 100)
   (stepsize 110))
   (snd-avg s blocksize stepsize OP-PEAK))


Steve D
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