[Speex-dev] speex on embedded processor

Alain M. alainm at pobox.com
Fri Feb 1 07:33:23 PST 2008

Hi Jean-Marc,

will you include these optimizations for minimal ram usage in the main 

Maybe if Peter sends a Patch...


Jean-Marc Valin escreveu:
> Sounds like you did most of what you needed to do. Using a coverage
> analysis tool might help you remove bits of code here and there (e.g.
> unused _ctl() cases), but the main part is done. About the preprocessor,
> there are some of the state variables that could instead be allocated on
> the stack, but that's about as far as you can shrink things.
> Cheers,
> 	Jean-Marc
> Peter Ruckle a écrit :
>> I need to shrink speex so it will fit on an embedded processor along
>> with some other code.  The chip has only 20k of ram.  I have done
>> some work with libspeex.dsp by removing references to all modes but
>> narrow band 8000 hz (submode 3).  I used the defines: FIXED_POINT,
>> structures for the other submodes and the functions that they called.
>> I reduced the NB_DEC_STACK and NB_ENC_STACK to the smallest values
>> and minimized the heap based on all calls to calloc.  I haven't
>> optimized the call stack yet.  I reduced the ram usage to around 6k.
>> The problem is when I added the preprocess functionality, the ram
>> usage went to around 20k.  I need to know what can be removed or
>> reduced from the S[eexPreprocessState structure.  The only
>> functionality we want to use is the denoise option.  We don't want
>> vbr or echo cancellation.  I only see about 1k that is directly
>> related that can be removed from the structure.  Are there any other
>> buffers in the structure that can be removed or a way to reduce the
>> size of some buffers.
>> Peter Ruckle
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