[linux-audio-dev] JACK/ALSA cannot set capture period lower than 512 with SBLive

[Robert Jonsson]

måndagen den 7 juni 2004 23.02 skrev Lee Revell:
> Hey,
>
> It seems to be a known issue that you cannot run JACK with the capture
> period size lower than 512 with the SBLive ALSA driver.  See this
> thread:
>
> http://ccrma-mail.stanford.edu/pipermail/planetccrma/2003-December/003764.h
>tml
>
> and this:
>
> http://www.music.columbia.edu/pipermail/linux-audio-user/2003-April/004040.
>html
>
> The above threads seem to indicate that this is a hardware limitation.
> However it seems to me more like a driver issue.  Using the kX drivers
> (on Windows, http://www.kxproject.com) with the exact same card, an old
> SBLive Platinum, Ableton Live is usable with the record and playback
> period sizes (set via ASIO driver config) at 64 samples (2.33 ms
> latency) with nothing else running, and rock solid at 128 (~5 ms) in the
> face of basically anything you throw at it.  Of course it crashes, as
> it's Windows, using an alpha quality third-party driver, but is quite
> usable in a live music setting.  512x2 is not really usable for my
> purposes.
>
> Is this assessment correct, and if so, can someone familiar with the
> SBLive ALSA driver give me an idea as to how this could be fixed?  Could
> this be done via ALSA config files maybe?

Your assessment is probably correct, I've brought up this issue a few times 
before. Fact is the ALSA driver for emu10k1 does not allow to set the capture 
buffer smaller than 512. Exactly why is still unknown, atleast to me. 
Unfortunately I don't think it can be solved with configuration.

Talking to the kx people would probably be a good idea if you wish to dive 
deeper into this issue. The ALSA lists is another place to try.

Regards,
Robert


>
> Lee

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