Subject: Re: [ecasound] weird delay in real time processing
From: S. Massy (firstname.lastname@example.org)
Date: Thu Jun 01 2000 - 23:57:45 EEST
On Thu, 01 Jun 2000, Jeremy Hall wrote:
> Remember that the OSS emulation is actually a front-end to the ALSA API,
> so if the ALSA stuff is broken in the right part, the OSS stuff will also
> be broken.
This holds true only if the problem is within the driver itself, if
the problem is within the routine used to deal with a certain API
(ALSA's API, for example) using OSS emulation (another API) will
actually fix the problem. In my case I believe I have two problems,
one with ALSA devices which appears to be with ecasound only (since I
don't experience this problem with arecord/aplay) and one with the
full duplex mode which could very well be somewhere in emu10k1 ALSA's
driver. Unfortunately, the more components are involved the harder it
is to track down where each problem comes from.
> In the new year, Kai Vehmanen wrote:
> > On Wed, 31 May 2000, S. Massy wrote:
> > > can be. Some stuff I did appeared to help, latest patches to ALSA
> > > 0.5.7, slightly bigger buffersize, etc. ALSA native devices are still
> > Have you tried the real OSS drivers?
> > > unusable, overly poor sound quality. I have to fall back on OSS
> > > emulation which has much more minor problems, or so I thought, but
> > > whenever I record to wave, which is my primary intent, the sound
> > > quality drops again. :( It'd be nice if someone could give me an
> > > advice on what the best chainsetup to do it could be, here's what I use:
> > Unfortunately there isn't much you can do on ecasound's side. If
> > "ecasound -i somefile.wav -o /dev/dsp" doesn't work, then there ain't
> > much you can do. Either your soundcard drivers or the hardware itself
> > is not working correctly. With more complex setups, ecasound can cause
> > problems, but it definitely should work with the above setup.
> > Few pointers:
> > - what apps do work (especially non-ALSA apps)?
> > - have you double-checked your irq and dma settings
> > (and possibly tried different configurations)?
> > - have you tried older ALSA drivers+
> > --
> > Kai Vehmanen <email@example.com> ---------------- CS, University of Turku .
> > . audio software for linux .. http://www.eca.cx .
> > . armchair-tunes mp3/wav/ra . http://www.wakkanet.fi/sculpscape .
> > --
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