[vorbis-dev] ogg-vorbis and ARM

[Ian Walters]

Hi,

I am attempting to port ogg-vorbis to the iPaq H36xx (see 
http://handhelds.org).  Since this device uses an ARM chip, no floating 
point.  Now the port was easy and worked fine, except that all the fp ops 
were emulated, making it very very slow.  So I thought I would try with 
-msoft-float so an exception doesn't occur on every fp operation.

libm had no soft-float library available, and I used a old, custom library I 
could easily recompile that had no asm code in it.  it has the following 
options

_POSIX_MODE _XOPEN_MODE _SVID3_MODE _IEEE_

Since I saw a flag -no-ieee-fp flag in the make files, I am guessing the last 
option is a no-go.  

However, while the straight compile encoded and decoded ogg files perfectly 
(at 95 times real-time), the -msoft-float code seems to provide mostly 
silence with the occasional bit of white-noise (like a short click or couple 
of short clicks).

Soooooo.... The questions are

What known floating point incompatabilities exist between ogg-vorbis and 
varaious fp libraries
What code is likely to be easiest (e.g. with little knowledge on my part) to 
convert to integer only code.

Thanks in advance for any help anyone can give me

Ian Walters.

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