On Tuesday 20 December 2005 16:55, Robin Getz wrote:> Hi.
>
> I was wondering if there is any work on a fixed point encoder for vorbis?
> If not, does anyone want to help with something?
>
> The purpose would be to make an icecast server on a low cost Linux
> platform, like Blackfin/uClinux, which doesn't have a floating point
unit,
> but does have plenty of fixed point mips.
>
Hi,
I am planning a master project for next year, at my school, where I will look
at making Ogg Vorbis use integer arithmetics, among other things. One of the
ideas I have is to use multiplicative division instead of regular division to
reduce rounding errors and consequently noise. One challenge is to convert a
multiplicative fraction back into its numerator and denumerator, but it is
not impossible. Maybe one has to use tables.
Currently I have created a small floating point library that uses
multiplicative fractions. I have created routines for square root,
logarithmics and the exponential function. Here are some extracts:
http://home.c2i.net/hselasky/math/fp_num.c
Does anyone have any comments on this?
Have anyone tried anything similar before?
--HPS