fixed-point sbc decoder

Victor,

I was working on the fixed point decoder. I also found and reorganized the inner loop around another optimization... the code I've written works when using floating point but something is not right in the fixed point. Can you have a quick look?

What I do is

btsco$ make && ./sbc/sbcdec t1.sbc

I suspect I'm not be doing the 64 to 32 bit conversions right...

http://bluetooth-alsa.sf.net/fixed/fixed-decode.patch
http://bluetooth-alsa.sf.net/fixed/t1.sbc

The latter is just an audio file, but as a bonus it's a friend's band (and probably too noisy to be a good test :)

Brad

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