[speex-dev] Port to uClinux
jean-marc.valin at hermes.usherb.ca
Sun May 18 18:28:09 PDT 2003
OK, what happens is that I try to allocate one big chunk of memory, so
that no other allocation is needed in run-time. The biggest part of that
memory is used for a custom stack I use everywhere because C doesn't
allow variable-length stack arrays. The sizes I used will work for all
configurations (any mode/bit-rate/complexity), but if you're only
interested in a subset, you can probably reduce these values.
Le sam 17/05/2003 à 17:00, Ico Doornekamp a écrit :
> I'm trying a quick port of this terrific codec to uClinux, a Linux-derivate
> for mmu-less systems. I'm particulary interested in the alloc()'s the
> library does, and it's stack usage.
> In nb_celp.c I found two lines of code doing memory allocation :
> nb_celp.c: st = (EncState*)speex_alloc(sizeof(EncState)+8000*sizeof(float));
> nb_celp.c: st = (DecState*)speex_alloc(sizeof(DecState)+4000*sizeof(float));
> Where do these magic numbers 8000 and 4000 come from ? If I decrease those
> to 4000 and 2000, my test app still works (just lucky ?). Is there a way to
> know what the minimal size should be for a particular bitrate / quality /
> etc ?
Jean-Marc Valin, M.Sc.A.
Université de Sherbrooke, Québec, Canada
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