Messages in this thread | | | Date | Mon, 25 Jun 2007 09:11:09 +0530 | From | "Nobin Mathew" <> | Subject | Re: Is it time for remove (crap) ALSA from kernel tree ? |
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> I sent a patch to the ALSA developers 4 years ago. > It was never included in the kernel :/
ALSA maintainers are very open to patches. try sending this again
> > Here's the comment from a script that I once wrote to > make some closed-source dinosar code run (speech recognition) > on modern linux: > > # Note that ALSA (Advanced Linux Sound Architecture), the sound drivers that > # replace the older OSS as of kernel 2.5, also introduce a problem for some > # soundcards: unlike the OSS drivers, the ALSA drivers limit the recording > # buffer to the hardware limit of your sound card. For example, the SB Live! > # only has two 'period' buffers (called fragments before), and although > # viavoice requests an 'arbitrary number of periods, size 1024 bytes', it > # only gets two periods of 1024 bytes: 2048 bytes in total! The ViaVoice > # engine however doesn't even process sound until it sees at least 6102 bytes. > # The 'solution' for this is to increase the buffer size (from 1024 to say > # 8192), this script also takes care of that. Unfortunately, also that is > # possibly not enough: the sound is read from the hardware in chunks of > # 'period size' and having only two buffers this is often causing an underrun. > # When ALSA sees an underrun... it stops the sound stream. >
native ALSA drivers has all these required features.
> My (four year old) patch can be found here: > > http://www.xs4all.nl/~carlo17/alsa/index.html > > I STILL think that ALSA should restart the stream after an underrun, > but I am not someone who asks twice :p usually.
If it is native ALSA driver then it will restart after each underrun and overrun. It is the applications job to do this, alsa-lib provides all support for this. I have no idea of OSS and OSS emulation in ALSA.
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