Re: [Bluez-devel] Advanced Audio Distribution Profile (A2DP)

[Brad Midgley <bmidgley@xmission.com>]

Marcel

It actually isn't that bad to do multiply and divide ops using fixed 
point. I committed a change that provides a config option --enable-fixed 
and provides the datatype and inline functions for the basic math ops 
and conversions (add and subtract don't need anything special)

I like the flexibility of keeping an LGPL license as long as we can.

I used the explanation in 
http://home.rochester.rr.com/ohommes/MathFP/mathfp_bg.html which is a 
lot better than trying to figure out or tear out code from mad.

One strange thing was I had to abandon using int32_t as the native type. 
For some reason, math ops on these things that should have used 64 bits 
for intermediate results instead used 32-bit intermediates. Anyway, 
using the type "int" outright made it work as expected.

I think a function to do the conversion from double to fixed will 
require linking libm (for trunc(double) etc) so hopefully we can avoid it.

Brad


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