[wdmaudiodev] Re: Enumeration of Nodes on Instantiated Pins
- From: "Jeff Pages" <jeff@xxxxxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Mon, 30 Sep 2002 15:09:57 +1000
Just as an aside on this thread, when you have multiple devices how do you
correlate dsound and mixer devices? I presume that the nth dsound device
does not necessarily correspond to the nth mixer device.
Jeff
----- Original Message -----
From: "Mitchell Rundle" <mitchr@xxxxxxxxxxxxx>
To: <wdmaudiodev@xxxxxxxxxxxxx>
Sent: Thursday, September 26, 2002 4:50 AM
Subject: [wdmaudiodev] Re: Enumeration of Nodes on Instantiated Pins
>
> I'm not laughing :) we do similar stuff in our test apps. If you only
> have 1 renderer, then you can simply use the wave out DST line (master
> volume) and set the waveout SRC line (assuming there is one) to unity.
> If you have multiple devices, then the difficulty is in correlating
> wave, mixer and dsound devices. Aside from that problem, I don't see
> any reason to use KS at all.
>
> Sorry for the tardiness of the whitepaper. I will be working on it this
> week.
>
> Mitch
>
> -----Original Message-----
> From: Art Edwards [mailto:snowdog0@xxxxxxxxxxxx]=20
> Sent: Wednesday, September 25, 2002 11:28 AM
> To: wdmaudiodev@xxxxxxxxxxxxx
> Subject: [wdmaudiodev] Re: Enumeration of Nodes on Instantiated Pins
>
>
>
> You assume correctly. I am referring to the mixer API.
>
> OK. But don't laugh.
>
> I'm interested in implementing an el-cheapo audio generator/analyzer.
> I've=20
> been using Directsound for the generator. I'd like to have some ability
> to=20
> predict what the output level (in volts or something similar) will be.
>
> For calibrating the system, I was hoping to take the approach of
> adjusting=20
> the wave volume while reading the volume node until I get it somewhere
> near=20
> 0dB. Then I figured I'd capture the mixer API setting & use that. I
> told=20
> you it was el-cheapo.
>
> I suppose a better approach would be to go Kernel Streaming the whole=20
> way. Then, I'd have a handle to the pin I created. But, I'm not sure
> how=20
> to accomplish that. Any news on that white-paper BTW ?...
>
> At 01:48 PM 9/25/2002 , you wrote:
>
> >By mixer, I assume you mean the mixer API and not Kmixer (Kmixer=20
> >doesn't need to know anything about the topology of downstream=20
> >filters).
> >
> >The mixer API gets the topology of the whole graph through Sysaudio.=20
> >Sysaudio exposes the audio graph as a few unconnected "virtual"=20
> >filters. E.g. The "wave" render graph is virtualized as a single filter
>
> >with all the nodes of all the real filters in the graph. The=20
> >inter-filter pin-to-pin connections are hidden in this view, which=20
> >simplifies things for the clients (e.g. Windows APIs). So if the mixer
>
> >API needs to set a volume control, it does so through a "virtualized"=20
> >pin handle on the Sysaudio filter. Sysaudio routes the call=20
> >appropriately.
> >
> >Out of curiosity, what are you trying to accomplish (big-picture-wise)?
>
> >Thanks.
> >
> >Mitch Rundle
> >Microsoft Corporation
> >
> >This posting confers no rights and contains no guarantees.
> >
> >
> >-----Original Message-----
> >From: Art Edwards [mailto:snowdog0@xxxxxxxxxxxx]=3D20
> >Sent: Wednesday, September 25, 2002 10:00 AM
> >To: wdmaudiodev@xxxxxxxxxxxxx
> >Subject: [wdmaudiodev] Re: Enumeration of Nodes on Instantiated Pins
> >
> >
> >
> >Yes, I forgot to mention that I can get the count of pin instances from
>
> >the filter.
> >
> >Hmmm, as I suspected...
> >
> >So, how does the mixer send property requests to the volume =
> control=3D20=20
> >pin-nodes on a wave out filter ?
> >
> >At 12:43 PM 9/25/2002 , you wrote:
> >
> > >It depends on what you mean by "enumerate". You can infer the count=20
> > >of
> >
> > >pin instances, but you cannot get handles to them (which is what=20
> > >you=3D20 need for sending property IOCTLs) unless you instantiated =
> them
>
> > >yourself
> >
> > >(e.g. via KsCreatePin).
> > >
> > >Mitch Rundle
> > >Microsoft Corporation
> > >
> > >This posting confers no rights and contains no guarantees.
> > >
> > >-----Original Message-----
> > >From: Art Edwards [mailto:snowdog0@xxxxxxxxxxxx]=3D3D20
> > >Sent: Wednesday, September 25, 2002 5:45 AM
> > >To: wdmaudiodev@xxxxxxxxxxxxx
> > >Subject: [wdmaudiodev] Enumeration of Nodes on Instantiated Pins
> > >
> > >
> > >
> > >Does anyone know if an application can
> > >enumerate pin instances on a filter ?
> > >
> > >If so, did I miss it when I searched the
> > >DDK help and the WDMAudioDev archives ?
> > >Or, is it top-secret ?
> > >
> > >I am trying to send IOCTL_KS_PROPERTY
> > >requests to volume nodes associated with
> > >a pin instance (i.e. so called
> > >pin-nodes) on a filter. I have been
> > >successful sending such requests to
> > >nodes that are global to the filter.
> > >(i.e. so called filter-nodes).
>
> Art Edwards
>
> Art's <http://members.localnet.com/~snowdog0/Resume>resume.
> Art's <http://www.soniqboom.net>band (a.k.a. Soniq Boom).
>
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