[wdmaudiodev] Re: WaveCyclic vs WavePCI for HD Audio
- From: Preston <prestonfick@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Sun, 29 Mar 2009 03:52:56 -0500
I should also add that this is for XPSP3, so WaveRT is not an option.
On Sun, Mar 29, 2009 at 1:58 AM, Preston <prestonfick@xxxxxxxxx> wrote:
> I've seen lots of discussions on WavePCI vs WaveCyclic but nothing
> specifically references HD Audio since both seem to have been available long
> before HD Audio existed .
>
> I know that the HD Audio DDI
> document<http://download.microsoft.com/download/e/b/a/eba1050f-a31d-436b-9281-92cdfeae4b45/HDAudioDdi11.doc>from
> Microsoft stated that the HD Audio sample driver was written using
> WaveCyclic. However based on reading the documentation WavePCI seems to be
> seen as the more effecient choice, but a bit trickier to implement. I did
> see another
> post<//www.freelists.org/post/wdmaudiodev/Problem-about-GetMapping-ReleaseMapping-in-WavePCI,12>on
> here that if states if implemented correctly, WavePCI doesn't yield much
> better results than WaveCyclic:
>
> "There should be no difference in audio quality between WaveCyclic and
> WavePci. ... The IRP handling between the two models is essentially the
> same, with the main difference that in the case of WavePci we hand you the
> page mappings from the mapped IRP buffer and in WaveCyclic we copy the data
> from the IRP buffer into your cyclic buffer based on your indication of DMA
> position with a DPC that is scheduled whenever you notify us."
>
> it seems like WaveCyclic would the reasonable choice for development, does
> anyone have reccomendations on this?
>
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