Subject: Re: [ecasound] blast of static when using /dev/dsp
From: S. Massy (theanaloguekid@tak.net.dhis.org)
Date: Sat Oct 14 2000 - 00:32:29 EEST
On Fri, 13 Oct 2000, Kai Vehmanen wrote:
> On Mon, 9 Oct 2000, S. Massy wrote:
>
> > that everytime the playback is started (with t) or restarted (s then
> > t) there's a short blast of static (maybe half a second). I did the
> > same test with different apps that use /dev/dsp and it seems that only
> > ecasound is plagued with this problem. A test using alsa output in
>
> Hmm, this might be related to OSS triggering feature. Most apps using OSS
> (/dev/dsp) don't use this feature, but ecasound always uses it (warns if
> not supported). The basic idea is: without triggering, apps write to
> /dev/dsp, and when there's enough data in the buffer, playback starts
> automatically. Ecasound however, writes data to /dev/dsp, but playback
> isn't started until ecasound explicitly issue a OSS trigger call. This is
I just tried playing with the buffersize and here's what I've found out:
The problem is almost inaudible at a buffersize of 1024 and increases
steadily as the buffersize is reduced so that it is very loud once
down to 128. Does this confirm what you suspected?
> used for synchronizing playback and recording. So, so, this could be a
> problem specific to your sound card (and its /dev/dsp drivers). Others,
> can you test this?
>
> --
> . http://www.eca.cx ... [ audio software for linux ] /\ .
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