[wdmaudiodev] asio track sync

From: "Faby, Paul" <pfaby@xxxxxxxxx>
To: <wdmaudiodev@xxxxxxxxxxxxx>
Date: Tue, 22 Feb 2005 12:26:59 -0700
Currently I'm developing an ASIO driver on top of DirectKS.
I'm using Cubase for testing.

Here's my setup.
Sine wave track loaded and configured to play out output 1

Output 1 is then ran into input 1.

Input 1 is armed for recording and will capture the sine wave...

Problem.  
The first time I record, I'll have almost a half second of silence in my
recording.  I can then hit stop, delete the newly recorded track, then
hit record one more time and the track lines up properly..!.!

If I go manually reset the driver, I also don't see this problem....e.g.
I go reset, then hit record, the audio lines up...i don't see the extra
silence.

Has anyone seen anything like this?
Much thanks
Paul




-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Tomislav
Harsnabovic
Sent: Monday, February 21, 2005 7:14 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] AC3 over WaveCyclic

Hello all!

I am currently working on a driver for an ordinary PCI soundcard based
on 
the WaveCyclic port class, and I'm desperately trying to pass an AC3
stream 
over S/PDIF. Unfortunately, my decoder doesn't make a sound. For testing

purposes, I utilize KsStudio and its 'Dolby Digital File Source' test 
filter because PowerDVD/WinDVD aren't able to connect to the SPDIF 
interface for some reason - they decode to PCM instead and pass the PCM 
stream down to the driver, which works flawlessly like every other PCM
stream.

The sound controller's registers and stuff are correctly set for an AC3 
stream, so my first guess was that the AC3 frames were chopped by 
WaveCyclic's stream copying mechanisms. Therefore I tried to force a 
framing size of 0x600 bytes (size of an AC3 frame) and a DMA size which
is 
a multiple of 0x600 bytes. But that didn't help. And now I'm a bit lost 
here because I ran out of good ideas.

I'd be grateful for some directions.

Cheers,

Tomislav

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[wdmaudiodev] asio track sync

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