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

[Frédéric Bastien]

Hi,

I have see an explanation of the memory leak on the mailing list long
time ago. So I implemented it and send on the mailing list a patch of
the fix. I hoped that someone with access would commited it. If the
last commit is from 2002, nobody commited it. So look in the archive
of the mailing list for the patch and apply them.

Who have commit access to the repository? I think it is time to commit
the patch after so long time. Especially if nodoby complained about it
and it is a small patch to review. This will prevent this trouble from
popping from time to time here. Is their any reason that it was not
commited?

Here is the link to the message with the patch:
http://lists.xiph.org/pipermail/tremor/2004-October/001112.html

this patch don't fix all memory fix, only the one that conserned me.
So event if it don't fix everything, I don't see why it should not be
accepted.

thanks

Frédéric Bastien

On Tue, Oct 28, 2008 at 9:36 AM, Ethan Bordeaux
<ethan.bordeaux at gmail.com> wrote:
> 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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