[speex-dev] Fixed-point in CVS

Chris Flerackers cflerackers at androme.be
Wed Oct 8 03:09:13 PDT 2003


Is there any speed advantage to using the fixed point version on a PC with
an Intel or AMD processor?
An advantage would be that you don't have to convert the audio input from
short to float but what about
encoding/decoding itself?

BTW, thanks for a great codec :-)

Best regards,

<p>>> ----- Original Message ----- 
>> From: "Jean-Marc Valin" <Jean-Marc.Valin at USherbrooke.ca>
>> To: "speex" <speex-dev at xiph.org>
>> Sent: Wednesday, October 08, 2003 8:48 AM
>> Subject: [speex-dev] Fixed-point in CVS
>> Hi,
>> I have been doing some work on a fixed-point port and it is now in CVS.
>> All of the CPU-intensive parts should now be using only integer
>> operations. Now, it's in a state where even non-coders can help: find
>> bugs. With all these changes, there are probably several bugs and some
>> may show up only under specific circumstances. Please test to see if the
>> fixed-point behaves the same as the floating point, under all kinds of
>> modes, all kinds of files, mixing versions for encoder and decoder, and
>> so on. Please report any case where the new version behaves badly
>> compared to other versions.
>> Last thing: to enable the fixed-point, you need to compile the
>> FIXED_POINT defined (sorry, no configure option yet).
>>  Jean-Marc
>> P.S. I'm also interested on speed reports on CPU's without an FPU.
>> (expect the fixed-point to run slower on x86)
>> -- 
>> Jean-Marc Valin, M.Sc.A., ing. jr.
>> LABORIUS (http://www.gel.usherb.ca/laborius)
>> Université de Sherbrooke, Québec, Canada

--- >8 ----
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