[wdmaudiodev] Re: Strange behaviour of directsound in Vista
- From: KS <wakeup1504@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Fri, 10 Aug 2007 11:52:04 +0800
Hi Jeff,
On the card that I saw the issue, the topology of the capture endpoint looks
something like below
bridge pin A -----> ADC A ----> vol A -----> filter pin A (Rec Endpoint A)
bridge pin B -----> ADC B -----> vol B ------> filter pin B (Rec Endpoint B)
Both endpoints are independent of each other. I do not see the same
behaviour on some other that uses a selector to connect 2 inputs to 1 filter
pin
bridge pin A --------> ADC A -------> vol A --------> Selector ------------>
filter pin
^
bridge pin B --------> ADC B -------> vol B --------------|
For your test, was it on an audio card with independent recording endpoints
from the topology view? Thanks.
KS
On 8/10/07, Jeff Pages <jeff@xxxxxxxxxxxxxxxx> wrote:
>
> I've just tried this with our own 2-input card, and it's behaving
> correctly
> with DirectSoundCapture, ie. whichever input I set the default capture
> endpoint to, DirectSoundCapture uses that input when I set the
> pcGuidDevice
> pointer to NULL or &DSDEVID_DefaultCapture.
>
> Let me know if there's any other tests you'd like me to try for
> comparison.
>
> Jeff
>
> ----- Original Message -----
> From: KS
> To: wdmaudiodev@xxxxxxxxxxxxx
> Sent: Thursday, August 09, 2007 1:45 PM
> Subject: [wdmaudiodev] Strange behaviour of directsound in Vista
>
>
> Hi,
>
> I've noticed something strange for applications that are using directsound
> when running in Vista. When I use it on my audio card that expose 2
> independent recording endpoint (rec-endpoint-a and rec-endpoint-b), and
> the
> default recording endpoint was set to rec-endpoint-a, my directsound
> application end up opening a recording stream on rec-endpoint-b instead.
>
> When I used RMAA to run a loopback test through directsound on the audio
> card, I've also found that in order to get the loopback test to use
> rec-endpoint-b, as I've selected in the application, I have to make sure
> that rec-endpoint-a is selected as the default in the sound control panel.
>
> Does anyone knows whether this is an expected behaviour, or is it an error
> in the directsound layer? Thanks.
>
>
> KS
>
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