[wdmaudiodev] Re: Clock Problems
- From: "David A. Hoatson" <dhoatson@xxxxxxx>
- To: <thatsamiam@xxxxxxxxxxx>, <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Fri, 10 Sep 2004 14:30:02 -0700
Hello,
I noticed your post on the WDM Audio Dev list server from *way* back, and
wondered if you ever got a reply from Microsoft?
I have noticed that after going though a repeated pause/restart condition
multiple times, WDM eventually stops sending audio (it still sends buffers,
but they are all silence). This happens with pretty much every driver I
have tested (including the AC97 sample driver), so I am pretty sure this is
a problem with WDM and not the driver. Has anyone else seen this problem
or have a fix?
Thank you,
David
----- Original Message -----
From: "Sam Tertzakian" <thatsamiam@xxxxxxxxxxx>
To: <wdmaudiodev@xxxxxxxxxxxxx>
Sent: Friday, January 23, 2004 11:19 AM
Subject: [wdmaudiodev] Clock Problems
Hi,
I have noticed that if I use GraphEdit to conntect the capture pin of an
audio device to the render pin of the same audio device and run the
stream everything is fine until I pause and then restart. After I restart
the render clock slows down from 44100 to 43488. I have tried with a
couple of audio cards and I have the exact same result.
I check by opening the Filter Properities Advanced tab in the "Slaving
Info" box.
Ordinarily, I would not have noticed this.
But, it really becomes a problem when I am trying to render video
synchronized with audio directly from a capture pin of a video filter.
The video renderer uses the master clock indicated by windows, but after
a pause and restart, the clock slows down and the render is forced to
slow down such that its rate of consuming buffers is less than that of
capture. Eventually the renderer has all the buffers and the capture
stream is starved.
I don't see a solution for this...Why does the clock rate slow down from
44100 to 43488?
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