Speex dev - Apr 2006 - How to create a compact Speex library

Hi,

Sorry if this a repost but I want to create the
smallest Speex library possible to be put in TI's
TMS320 DSP.  I'm only interested in one configuration:
5.97 Kbps narrowband.  What part of source code can I
remove?  Currently, when I compiled the version 1.1.12
libspeex.a library with the TI TMS320 and
Fixed-Integer options, I get around 522Kb.  I would
like to reduce it to as small as possible given my
above 5.97 Kbps operating constraints (I don't need
all the other extra features from Speex: jitter
buffer, echo cancellation, etc).

Please advise.

Thanks in Advance,
Andy

Andy

> Sorry if this a repost but I want to create the
> smallest Speex library possible to be put in TI's
> TMS320 DSP.  I'm only interested in one configuration:
> 5.97 Kbps narrowband.  What part of source code can I
> remove?  Currently, when I compiled the version 1.1.12
> libspeex.a library with the TI TMS320 and
> Fixed-Integer options, I get around 522Kb. 
You mean kilo-bit or kilo-byte? The former is what I'd expect, so if
you're getting the latter, something's already wrong.
>  I would
> like to reduce it to as small as possible given my
> above 5.97 Kbps operating constraints (I don't need
> all the other extra features from Speex: jitter
> buffer, echo cancellation, etc).
First, try --disable-wideband (or define DISABLE_WIDEBAND). Then you can
start removing other stuff you don't need. To get rid of the echo
canceller, simply remove mdf.c. Then you can get rid of jitter.c,
preprocess.c, pcm_wrapper.c, smallft.c, ... Basically, if you remove the
file and it still works, then it wasn't needed. In addition to all the
files you can remove without the need to touch anything else, the
following can be disabled as long as you disable a bit of code:
- VBR (vbr.c and references to VBR in nb_celp.c)
- codebooks for other bit-rates: 
   * all exc_*.c files except exc_10_16_table.c
   * gain_table.c

There might be a few bits more that can be removed, but I think this
summarizes it well.

	Jean-Marc

--- Jean-Marc Valin <jean-marc.valin@usherbrooke.ca>
wrote:
> > Sorry if this a repost but I want to create the
> > smallest Speex library possible to be put in TI's
> > TMS320 DSP.  I'm only interested in one
> configuration:
> > 5.97 Kbps narrowband.  What part of source code
> can I
> > remove?  Currently, when I compiled the version
> 1.1.12
> > libspeex.a library with the TI TMS320 and
> > Fixed-Integer options, I get around 522Kb. 
> 
> You mean kilo-bit or kilo-byte? The former is what
> I'd expect, so if
> you're getting the latter, something's already
> wrong.
> 
> >  I would
> > like to reduce it to as small as possible given my
> > above 5.97 Kbps operating constraints (I don't
> need
> > all the other extra features from Speex: jitter
> > buffer, echo cancellation, etc).
> 
> First, try --disable-wideband (or define
> DISABLE_WIDEBAND). Then you can
> start removing other stuff you don't need. To get
> rid of the echo
> canceller, simply remove mdf.c. Then you can get rid
> of jitter.c,
> preprocess.c, pcm_wrapper.c, smallft.c, ...
> Basically, if you remove the
> file and it still works, then it wasn't needed. In
> addition to all the
> files you can remove without the need to touch
> anything else, the
> following can be disabled as long as you disable a
> bit of code:
> - VBR (vbr.c and references to VBR in nb_celp.c)
> - codebooks for other bit-rates: 
>    * all exc_*.c files except exc_10_16_table.c
>    * gain_table.c
> 
> There might be a few bits more that can be removed,
> but I think this
> summarizes it well.
> 
> 	Jean-Marc
> 

Thanks, that help a lot.  I was able to reduced the
library from 522Kb to 296Kb per your suggestions.  I
want to reduce it more but don't know what other files
to remove; you wrote "..., smallft.c, etc.", would you
mind specifying the "etc" files; I know I'm too lazy
to figure it out myself and since you are the expert,
I will trush you more.  Thanks.