[wdmaudiodev] Re: Can I identify my audio endpoint?
- From: Frank Yerrace <Frank.Yerrace@xxxxxxxxxxxxx>
- To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Thu, 26 Oct 2006 16:55:35 -0700
I hope Mitch or Noel can confirm this, but here's my understanding.
The first two bytes are a VARTYPE, in this case a VT_BLOB. The next two bytes I
believe are DONTCARE (you probably see random values because of some unpacked
structure definitions used in code to generate this data, and I'm sure this
caused confusion as you tried to reverse engineer this). The next four bytes
are a count of the bytes to follow.
Frank Yerrace
Microsoft Corporation
This posting is provided "AS IS" with no warranties, and confers no rights.
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Jeff Pages
Sent: Thursday, October 26, 2006 4:14 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: Can I identify my audio endpoint?
I've asked this question a couple of times but haven't yet received an
answer. What are the first 8 bytes of the PKEY_AudioEngine_OEMFormat block?
The rest of it's pretty clearly a WAVEFORMATEXTENSIBLE structure, but those
first 8 bytes have me baffled.
Jeff
----- Original Message -----
From: "Frank Yerrace" <Frank.Yerrace@xxxxxxxxxxxxx>
To: <wdmaudiodev@xxxxxxxxxxxxx>
Sent: Friday, October 27, 2006 9:00 AM
Subject: [wdmaudiodev] Re: Can I identify my audio endpoint?
> Mike, your answer to Alexandra's question is correct.
>
> Regarding your question- you'll noticed these directives:
>
> HKR,"FX\\0",%PKEY_SYSFX_Association%,,%KSNODETYPE_ANY%
> HKR,"EP\\0",%PKEY_AudioEndpoint_Association%,,%KSNODETYPE_SPEAKER%
>
> The "association" value tells the audio system to propagate the properties
> to all endpoints of that specific node type. You can see that the node
> type is "any" for the FX properties and it is "speaker" for the endpoint
> properties.
>
> If you want some properties for one type of endpoint and other properties
> for a different type of endpoint, then you can create another set of keys
> that start with, for example, "EP\1" and set a different association value
> under that key. You can create as many "EP\n" keys as you need.
>
> I'd be interested in hearing your results if you try this.
>
> Frank Yerrace
> Microsoft Corporation
> This posting is provided "AS IS" with no warranties, and confers no
> rights.
>
>
> -----Original Message-----
> From: wdmaudiodev-bounce@xxxxxxxxxxxxx
> [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Michael R. Preston
> Sent: Thursday, October 26, 2006 3:46 PM
> To: wdmaudiodev@xxxxxxxxxxxxx
> Subject: [wdmaudiodev] Re: Can I identify my audio endpoint?
>
> Frank, see my questions below. I want to answer Ally's question first,
> then I have a question for you...
>
> In the INF file that came with the Swap APO sample code, there are
> examples of how to put values into both the FX property store, and the
> endpoint property store. Entries to go into the FX property store get a
> label of "FX\\0", and entries to go into the endpoint property store get
> a label of "EP\\0". The following is taken from the aforementioned INF
> file:
>
> ;;
> ;; All FX\\0 entries in the same grouping
> ;;
> [SysFx.AddReg]
> HKR,"FX\\0",%PKEY_DisplayName%,,%SYSFX_FriendlyName%
> HKR,"FX\\0",%PKEY_SYSFX_PreMixClsid%,,%SYSFX_PREMIX_CLSID%
> HKR,"FX\\0",%PKEY_SYSFX_PostMixClsid%,,%SYSFX_POSTMIX_CLSID%
> HKR,"FX\\0",%PKEY_SYSFX_UiClsid%,,%SYSFX_UI_CLSID%
> HKR,"FX\\0",%PKEY_SYSFX_Association%,,%KSNODETYPE_ANY%
>
> ;;
> ;; All EP\\0 entries in the same grouping
> ;;
> ;; Set default format to 48kHz, 16-bit, Stereo
> ;; Add endpoint extension property page
> ;;
> [OEMSettingsOverride.AddReg]
> HKR,"EP\\0",%PKEY_AudioEndpoint_Association%,,%KSNODETYPE_SPEAKER%
> HKR,"EP\\0",%PKEY_AudioEngine_OEMFormat%,%REG_BINARY%,41,00,8C,70,28,00,00,00,FE,FF,02,00,80,BB,00,00,00,EE,02,00,04,00,10,00,16,00,10,00,03,00,00,00,01,00,00,00,00,00,10,00,80,00,00,AA,00,38,9B,71
> HKR,"EP\\0",%PKEY_AudioEndpoint_Ext_UiClsid%,,%AUDIOENDPOINT_EXT_UI_CLSID%
>
>
> The reason I'm bringing this up, is that I think there may be a problem
> with this mechanism. I'm running on a system with more than one
> playback endpoint (Speakers, Headphones, and S/PDIF). I can see entries
> destined for the FX property store get populated for all endpoints.
> However, entries destined for the endpoint property store only seem to
> get populated for the first (default) endpoint. Frank, is this a known
> problem? Any comments or suggestions?
>
> Thanks,
> Mike
>
> Alexandra Schoepel (Ally) wrote:
>> Hi Frank,
>>
>> Regarding setting a special property to help us locate our endpoint: as
>> far as I can tell, the sysfx example adds properties to the FX
>> PROPERTIES key in the registry, but not the 'standard' one, e.g.
>>
>> ..\MMDevices\Audio\Render\{DS GUID}\Properties\
>>
>> Am I missing something, or does the example only demonstrate adding
>> properties for the effects? It looks to me the only way to find the
>> endpoint associated with an audio driver is by the device
>> name/description from the inf.
>>
>> Thanks,
>> Ally
>>
>> ------------------------------------------------------------------------
>> *From:* wdmaudiodev-bounce@xxxxxxxxxxxxx
>> [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] *On Behalf Of *Frank Yerrace
>> *Sent:* Wednesday, October 18, 2006 3:53 PM
>> *To:* wdmaudiodev@xxxxxxxxxxxxx
>> *Subject:* [wdmaudiodev] Re: Can I identifying my audio endpoint?
>>
>> I'm sorry I misled you with my previous response. A colleague reminded
>> me that PKEY_Endpoint_KsComponentId is not generally available in the
>> endpoint property stores. Another alternative- similar in concept- is
>> for your device INF to indirectly populate the endpoint property stores
>> with your own custom properties. The SYSFX sample demonstrates this.
>> (Sorry I don't have a pointer to the SYSFX sample or documentation at my
>> fingertips. I believe it's been referenced in other messages to this
>> mailing list.) Then your app can search for an endpoint that has your
>> custom properties in its property store.
>>
>>
>>
>> Frank Yerrace
>>
>> Microsoft Corporation
>>
>> This posting is provided "AS IS" with no warranties, and confers no
>> rights.
>>
>>
>>
>> ------------------------------------------------------------------------
>>
>> *From:* wdmaudiodev-bounce@xxxxxxxxxxxxx
>> [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] *On Behalf Of *Alexandra
>> Schoepel (Ally)
>> *Sent:* Tuesday, October 17, 2006 4:12 PM
>> *To:* wdmaudiodev@xxxxxxxxxxxxx
>> *Subject:* [wdmaudiodev] Re: Can I identifying my audio endpoint?
>>
>>
>>
>> Yes it does. Okay, very cool. Is this key defined in a standard header
>> or is there a section of documentation describing how the KSCOMPONENTID
>> is encapsulated in the PROPVARIANT so I don't bother you any more. :)
>>
>>
>>
>> Thanks again,
>>
>> Alexandra Schoepel
>>
>>
>>
>> ------------------------------------------------------------------------
>>
>> *From:* wdmaudiodev-bounce@xxxxxxxxxxxxx
>> [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] *On Behalf Of *Frank Yerrace
>> *Sent:* Tuesday, October 17, 2006 3:59 PM
>> *To:* wdmaudiodev@xxxxxxxxxxxxx
>> *Subject:* [wdmaudiodev] Re: Can I identifying my audio endpoint?
>>
>> Does your device have its own audio driver? One alternative is to read
>> PKEY_Endpoint_KsComponentId from the endpoint property store. This
>> returns a KSCOMPONENTID structure. However, for this endpoint property
>> to have useful information, the audio driver must support the KS
>> property KSPROPERTY_GENERAL_COMPONENTID and fill it in with useful
>> information.
>>
>>
>>
>> Frank Yerrace
>>
>> Microsoft Corporation
>>
>>
>>
>> This posting is provided "AS IS" with no warranties, and confers no
>> rights.
>>
>>
>>
>>
>>
>> ------------------------------------------------------------------------
>>
>> *From:* wdmaudiodev-bounce@xxxxxxxxxxxxx
>> [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] *On Behalf Of *Alexandra
>> Schoepel (Ally)
>> *Sent:* Tuesday, October 17, 2006 3:27 PM
>> *To:* wdmaudiodev@xxxxxxxxxxxxx
>> *Subject:* [wdmaudiodev] Can I identifying my audio endpoint?
>>
>>
>>
>> Hi guys,
>>
>> What is the most effective way to identify one's own audio endpoint when
>> using the IMMDeviceEnumerator? None of the published Audio Endpoint
>> properties seem to be uniquely tied to the device. The DirectSound GUID
>> (PKEY_AudioEndpoint_GUID) seems to be a floating value assigned by the
>> OS and in no way tied to any information in the inf file of the driver.
>> Additionally, help on the IMMDevice::GetId function states that the
>> information it represents is opaque and should not be used to obtain
>> information about the device. Any advice?
>>
>> Thanks,
>> Alexandra Schoepel
>>
>
> --
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> | Mike Preston | Home/Office: (360)756-1655 |
> | E-mail: mike@xxxxxxxxxxxxxxxxxxx | Cell: (360)303-9331 |
> |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~|
> | The man who follows the crowd will usually get no |
> | further than the crowd. The man who walks alone is |
> | likely to find himself in places no one has ever been. |
> | -- Alan Ashley-Pitt |
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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