OSS is DEAD and with kernel 2.6 most if not all distros will use ALSA by default while
providing an OSS emulation layer.
mmap is not necessarily needed for good performance and low latency and it would be
better if people implemented only a jackd interface to provide maximum benefits for users.
writing a jackd client is much easier than using ALSA, OSS etc directly plus you get all the
routing for free and you can totally forget about mmap and other soundcard specific stuff.
The future of audio on linux is called jackd clients, jackd that does audio I/O via ALSA.
Please remove OSS and /dev/dsp from your dictionary :-)
cheers, Benno http://www.linuxsampler.org
Jaroslav Kysela wrote:
Hello,
we discovered your notes about ALSA (Advanced Linux Sound Architecture) on your web pages:
http://www.transgaming.com/showthread.php?news=98
Please, let me comment ALSA issues. Perhaps, your development people should contact us directly before making such bad assumptions.
ALSA, of particular interest to TransGaming's Linux audience, does not
provide much of an added benefit over OSS. The primary speed advantage,
hardware mixing, a slower kludgy implementation use due to the fact that
looping sound doesn't appear to be supported; although full duplex
What's looping sound? You can initiate endless ring buffer looping when
you set stop_threshold to boundary (sw_params). I think that this major drawback does not exist.
support should be easier to provide than with OSS. The major drawback of
ALSA is that its mmap interface is not compatible with what is required
for DirectSound unless undocumented interfaces are used. All in all it
appears that using ALSA would provide some speed advantages for newer
cards, but to be done properly would require a rewrite of the winealsa
driver. Thus we would suggest that, for the time being, people continue
to use the OSS emulation layer of ALSA with "MMap" = "Y" enabled in
their config file to get the best performance if it's supported on their
sound card.
We can do everything with our API like OSS and our API has many other extensions which OSS does not have.
Again, please, tell your developers that they are wrong and remove this paragraph from your pages, because this text hurt us.
Jaroslav Kysela The ALSA project leader
----- Jaroslav Kysela <[EMAIL PROTECTED]> Linux Kernel Sound Maintainer ALSA Project, SuSE Labs
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