[Tremor] fixed vs float audio performance, lowmem branch, and latest memory leak fixes?

[Ethan Bordeaux]

Hi everyone, I've just started working on a Vorbis project and I have a few
questions.

1.  One of the first things I need to do is demonstrate the performance
difference the fixed and floating point version of the decoder.  From what I
read there isn't a defined set of test vectors for proving functionality,
but does anyone have a general set of recommendations on what would be a
good set of sounds/encoded vorbis files to use for this purpose?  I could
just blindly feed in sweeps, noises, and music samples, but I was hoping for
something a bit more scientific and rigorous than that.  Even if it's
something that could be borrow from verification of another audio codec,
that would be a good start.

2.  As this is going into an embedded system, memory usage is very important
to me.  I saw a note that the lowmem branch saves approximately 10-15% of
dynamic memory usage at the cost of an additional startup delay.  Has anyone
quantified this startup delay?  I know it will vary greatly depending on
target system but even a rough figure and a note on which platform you're
running on would be great.  I won't have the luxury of running on target
until pretty far into the project so it's important that I pick the right
starting point for my optimizations.

3.  I've seen a few notes on reported memory leaks in the Tremor source and
mentions of patches for these problems.  However, it's unclear to me exactly
where these patches reside.  All I've found thus far are the Tremor trunk
and lowmem branch both of which have the same changelog which ends in May
2002.  Are these memory leak fixes integrated into either of these
branches?  If not, where exactly can I find them?  I'm quite unfamiliar with
svn so my appologies if there's some command within subversion that lets me
view or gets these changes.

4.  Are there any other recommended mailing lists/discussion boards for
discussing Vorbis and audio compression?  While this is the perfect place
for these questions, it's a little quiet around here.

Thanks for the help.

Ethan
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