[wdmaudiodev] Re: Audio device control in Windows 7.

  • From: Michail Nikolaev <michail.nikolaev@xxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Mon, 28 Sep 2009 14:37:32 +0300

Hello.
Also, in Windows Vista and Windows7 you can use loopback recording to
capture audio output via user mode. See Core Audio API documentation(for
AUDCLNT_STREAMFLAGS_LOOPBACK param).

2009/9/28 mana <m92.suzuki@xxxxxxxxx>

> Hi all,
>
> I am developing the sound capture application in Windows 7.
> My goal is ...
>
>  1.Capture mixed audio output on the system using my virtual sound driver.
>  2.Without changing the preferred audio device by the user.
>  3.Captured audio data will put to the own audio encoder and send to the
> client
>    process which runs on remote and local PC.
>
> Now, my problem is No.2.
> And I know that there is no public mechanism (APIs) to change the default
> audio device from my application.
>
> Then, I have two question.
>
> Q1.
>  I want to disable all physical audio devices and enable only my
>  sound device (my virtual sound driver). Is it possible?
>  I want to do the state like the "Remote Playback Audio" that
>  appears in the audio redirection of RDP session.
>
> Q2.
>  In a server PC, Can I establish the RDP session only of audio?
>  I want to use only the audio redirection of the RDP. If it is possible,
>  I think that I will capture audio system data from "Playback audio
> device".
>
> Q3.
>  Is there any information about the mechanism of RDP audio redirection?
>
>  I am studying now about the RDP (Service APIs/Vitual
> Channel/Protocol ...) at the MSDN Library,
>  but I am still insufficient of understanding.
>
> Thanks & best regards,
> Mana.
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