[wdmaudiodev] Re: IPreFetchOffset and AC3
- From: "Van Mieghem, Dirk" <dvm@xxxxxxxx>
- To: "'wdmaudiodev@xxxxxxxxxxxxx'" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Tue, 3 Dec 2002 13:31:53 +0100
Oops, my fault! It wasn't clear I was supposed to set the prefetch offset.
Thank you very much,
Dirk
> -----Original Message-----
> From: Martin Puryear [mailto:martinp@xxxxxxxxxxxxx]
> Sent: Tuesday, December 03, 2002 10:27
> To: wdmaudiodev@xxxxxxxxxxxxx
> Subject: [wdmaudiodev] Re: IPreFetchOffset and AC3
>
>
>
> That's odd. =20
>
> Your wording makes me think maybe you have this backwards.
> YOU need to =
> QI the WavePci pin for IPreFetchOffset, and then call
> SetPreFetchOffset =
> on it. In the latest DDK, ac97smpl demonstrates how to do this.
>
> Do I misunderstand you?
>
> Martin Puryear
> Development Manager
> Windows Audio/Video Platform
>
> This posting is provided "AS IS" with no warranties, and confers no =
> rights.
> Ce message est fourni en l'=E9tat, sans garantie d'aucune
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> vous conf=E8re aucun droit. Vous assumez tous les risques
> li=E9s =E0 son =
> utilisation.
>
> -----Original Message-----
> From: Van Mieghem, Dirk [mailto:dvm@xxxxxxxx]=20
> Sent: Friday, November 29, 2002 9:52 AM
> To: 'wdmaudiodev@xxxxxxxxxxxxx'
> Subject: [wdmaudiodev] IPreFetchOffset and AC3
>
>
>
> Hi Martin,
>
> the article at =
> http://www.microsoft.com/hwdev/tech/audio/highperf-drv.asp
> mentions the IPreFetchOffset interface. In a final attempt to
> get AC3 =
> reliably going, I checked if this interface is queried on any
> pin but =
> neither W2K/SP3 nor WXP/SP1 seems to use this interface. Is this =
> interface supposed to fix the AC3 problems with WavePCI? I tried to =
> reduce the mappings to the bare minimum but AC3 over
> DirectSound still =
> can't keep up.
>
> Any suggestions?
>
> Thanks,
> Dirk
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