[FFmpeg-devel] [Issue 664] [PATCH] Fix AAC PNS Scaling

[Uoti Urpala]

On Tue, 2008-10-07 at 23:01 +0200, Michael Niedermayer wrote:
> On Tue, Oct 07, 2008 at 04:40:20PM -0400, Alex Converse wrote:
> > Does ffmpeg target any non IEEE-754 machines?
> 
> ffmpeg should work on mostly POSIX- mostly ISO C- twos complement machines
> that does not implicate IEEE i think ...

Plain C says so little about floating point that it is impossible to
write a useful program relying only on "guaranteed to work by the
standard" assumptions. There's no widely used standard between the
precision levels of C and IEEE-754, so in practice a program must choose
between  1) require IEEE-754  2) list a custom set of assumptions  3)
decide "how likely is this to work on practical platforms?" on a
case-by-case basis.