Subject: Re: [ecasound] blast of static when using /dev/dsp
From: Kai Vehmanen (k@eca.cx)
Date: Fri Oct 13 2000 - 23:49:11 EEST
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
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?
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