Hi all,
I've made a simple cleanup which unifies all snd_pcm_hw_params_*
functions. The first set of changes are in CVS a few days, but some
developers pointed that the backwards compatibility is a right thing.
After some thoughs, I think that this sort of cleanups is good for
implementing at any time. It doesn't break the implementation (in the
sense of behaviour), but it makes that older code is not compilable.
Fortunately, any C programmer can fix the compilation in this case, so
it's definitely not a big problem.
The much bigger drawback is that we have no binary compatibility
with older applications. I decided to use the versioned symbols in the
future versions of alsa library and to keep the binary compatibility with
older versions of library (function declarations). At the time, we have
two symbol versions: ALSA_0.9.0 and ALSA_0.9.0rc4.
These solutions exists for co-existing older and newer
applications:
1) New "versioned" library is libasound.so.3, so that older applications
uses older libasound.so.2.
2) Recompile older applications with "compatible library" which contains
versioned symbols ALSA_0.9, but headers are compatible with 0.9.0rc3.
This library will be also libasound.so.3, but ALL symbols have ALSA_0.9
tag which allows to override functions in future. The compatible library
will be built when '--with-compat-rc3' argument is passed to the
configure script in alsa-lib. This solution allows keeping binary
compatibility and allows to update alsa-lib with recent one (built
without --with-compat-rc3).
I suggest to use the second solution from this time.
Objections/further discussion is welcome.
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project http://www.alsa-project.org
SuSE Linux http://www.suse.com
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