OpenSound - was Re: lockmgr patch

Steve O'Hara-Smith steve at
Sat Jun 16 02:44:34 PDT 2007

On Sat, 16 Jun 2007 04:11:28 -0400
Chris Turner <c.turner at> wrote:

> I suppose the standard answer from that perspective is that these are
> still two separate types of scenarios - the TV card / audio record synch
> is a passive, 'recording centric' type of thing that can be buffered
> more before to catch all the hardware interrupts (e.g 1 second is ok),

	Not really because the audio is coming through the sound card and
the video is coming separately through the bktr device so to have the audio
and video in sync requires either very low latency in both or precisely
matched latency. I know the bktr device has very low latency because there
is only a single frame buffer presented by DMA which rather implies that
the sound recording also has very low latency.

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