Vorbis dev - Aug 2000 - double -> float conversion

I'm in the process of collecting performance data on my platform and I
thought I'd test the difference between double and float performance.  So, I
replaced all occurances of double in vorbis with float (as was suggested should
work).

  I ended up hanging at:

#0  0x0002695c in cacm283 ()
#1  0x00026dd0 in vorbis_lpc_to_lsp ()
#2  0x0001b3cc in forward ()
#3  0x0001cac8 in forward ()
#4  0x0000b844 in vorbis_analysis ()
#5  0x000030b4 in oe_encode ()
#6  0x00002230 in main ()
#7  0x00001a04 in _start ()
#8  0x000018a8 in start ()
(gdb) q

  Is the rewritten LPC/LSP (whatever that is :) that works with floats on the
head of the repository?

-tim

  (of course, maybe I missed something - I only did lib, include and
vorbis-tools)

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> 
>   I'm in the process of collecting performance data on my platform and
I thought I'd test the difference between double and float performance.  So,
I replaced all occurances of double in vorbis with float (as was suggested
should work).
> 
>   I ended up hanging at:
> 
> #0  0x0002695c in cacm283 ()
> #1  0x00026dd0 in vorbis_lpc_to_lsp ()
> #2  0x0001b3cc in forward ()
> #3  0x0001cac8 in forward ()
> #4  0x0000b844 in vorbis_analysis ()
> #5  0x000030b4 in oe_encode ()
> #6  0x00002230 in main ()
> #7  0x00001a04 in _start ()
> #8  0x000018a8 in start ()
Ah, the iterative root finder ran out of precision.

The *decoder* is currently well tested with floats.  The encoder will work too 
if you guard the LSP root finder against near-digital-silence.  I haven't 
determined the proper threshold value for using floats, although I suppose I 
should do so.

(you're hitting this case, I'll guess, in a frame os near silence with
just a
bit or two over 1024 samples to make the frame nonzero).

<onty

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