Speex dev - Aug 2004 - Re: does installed lib support _int()s ?

Assuming one prefers to use the speex_encode_int() and
speex_decode_int() when available, but fallback to speex_encode()
and speex_decode() if an older version if the lib is installed,
how does one best make the determination?

The only thing I can see to do is call speex_init_header() and look
at the result. Even at compile time it seems one must compile a test
app that outputs that data and then look at the version field of the
header struct....

OTOH, I do not see the version string in the strings(1) output from
either the static or shared libs.  Am I missing something obvious?

-JimC

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> Assuming one prefers to use the speex_encode_int() and
> speex_decode_int() when available, but fallback to speex_encode()
> and speex_decode() if an older version if the lib is installed,
> how does one best make the determination?
Well, for compile-time, I'd think that an #ifdef would do the trick.

The only way you could do it at RUNTIME is if you perform a dlopen() on the
speex library instead having it shared-linked, since the runtime ld.so will
fail to run your binary if it's linked against an old speex library without
the speex_XXXXX_int() symbols.  You'd open the .so file with RTLD_LAZY mode.

Of course, you'll need to figure out where the speex library is within your
program.  You'll be linking against libdl rather than libspeex, and
performing  a dlopen() and dlsym() for the various entry points.

You could always walk the /etc/ld.so.conf file for pathnames where to look
for the libspeex.so files.

=MB
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>>>>> "Malcolm" == Malcolm Baldridge
<speex@paypc.com> writes:
Malcolm> Well, for compile-time, I'd think that an #ifdef would do the
Malcolm> trick.

How?  VERSION isn't included anywhere except in speex_init_header(),
and I do not see any other symbols that encode the version....

That said, I looked at the code for speex_encode_int and friends
since writing that.  When compiled w/o --enable-fixed-point the
_int functions do what the code I was looking at updating already
does: convert each sample from short to float in a loop.  And
when compiled w/ --enable-fixed-point the non _int funtions do
the opposite.

It wouldn't matter except that the dists are taking their time moving
from 1.0 to 1.1.  'Twould be easier were they all at 1.1.

-JimC

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