[Tremor] Implementing Tremor on low-end ARM

[Nicholas Vinen]

Andy Grundman wrote:
> I tested your patch with one of my test files with a 100K artwork  
> comment, it's a -q9 file, and fails:
>
> STATIC MEMORY ERROR: tmem.bufdata exhausted (9216/8192)
>
> It also fails on a newly encoded -q9 file without any comments:
>
> STATIC MEMORY ERROR: tmem.dectable exhausted (15844/14602)
>
> This file is here: http://bugs.slimdevices.com/attachment.cgi?id=3261
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>   

It's because different allocations take up different amounts of space as
the quality level changes. My latest patch allocates pretty much
everything out of a single piece of memory, so if one thing grows and
another shrinks it doesn't fail like that. Try this one:

http://x256.org/~hb/Tremor3.patch

I'm still a bit uncertain about the comment truncation code; it works on
all my test files now (1k, 2k, 3k, 4k, 5k and 40k comments) but I'm
really not sure that it won't break on some other size. Unfortunately I
find the way the code parses the file rather mysterious and complex and
I have too many other things to work out now to work it all out. I think
the general approach is sound - ignore and discard the latter pages of
large comment fields as they're being read in - but I've implemented it
in a rather clumsy way.



Nicholas