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Is it possible to create another audio device and redirect only wanted input streams to it?

Here's my concrete problem:

I am broadcasting a game via XFire and it uses the Windows audio device to capture any audio I receive. As I am broadcasting, other users who watch the video stream are communicating with me over Skype, and they hear themselves back within the video stream and it is entirely logical since I am broadcasting the audio I hear.

What I want to do is create another audio device within Windows and redirect (pipe) ONLY the audio input from that game and not the input reveived from Skype. I would then tell XFire to use that newly created "virtual" audio device to broadcast and therefore my partners won't hear themselves back.

Is there any software that can do that or can it be achieved natively with Windows? (I am under Windows 7).

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up vote 10 down vote accepted

Give a try to Virtual Audio Cable. It creates virtual audio cards and let you route sound from outputs to inputs using virtual cables.

alt text

It runs with Windows 7. It's not free but there is a trial version, so you can check if it can do what you need.

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That is exacly what I needed! Though I would like a similar application that is free. It always says "Trial" while waving the audio which is quite irritating. Do you know any free alternatives? – Steven Rosato Mar 9 '10 at 0:36
    
Not that I know of, sorry. – Snark Mar 9 '10 at 6:28
1  
Hi, I've been looking for a solution to this problem for a while too. I have tried VAC but think it only works as a 'what you hear' re-direct/loopback... Am I right in saying that VAC will not help with D3D apps which use the system's default audio device and DON'T have a setting to change which audio device to use? The problem is that if you're running the app/game in a windowed mode, you also get Windows sounds piped through the system-default audio device (which would need to be the VAC virtual device). Anyone know of something that lets you only isolate the sound from any D3D app/game? – Beeblebrox Jan 2 '14 at 11:37
    
I think this is a free alternative: vb-audio.pagesperso-orange.fr/Cable/index.htm – endolith Oct 1 '15 at 15:41

Virtual Audio Streaming worked for me without that silly "Trial" speech in the middle of my recording.

Virtual Audio Streaming can record ALL sounds that played from your computer. It is done by our kernel-mode virtual audio card driver to ensure the recording quality

Hope this helps if you're still looking for this!

alternativeto.net is a great resource for alternatives to software like this. I wanted to do the same thing as you, so that I could record an MP3 as a voicemail for Google Voice. With that site I found this software that functions essentially the same as Virtual Audio Cable.

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I wasn't able to make this tool work for me, while Virtual Audio Cable worked out well in my case (except for the "trial" noise). – AntonK Sep 20 '13 at 21:34

https://github.com/rdp/virtual-audio-capture-grabber-device is my attempt at one. Free, open source! :)

ffsplit used to have something similar (now defunct?)

See also http://web.archive.org/web/20140222025420/http://superuser.com/questions/98720/is-there-a-free-or-open-source-equivalent-to-vac/364156

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The first link leads to what I think is the most slapstick / disorganized project I've ever seen on GitHub, which is not even open-source or has any obvious way to build it. The other link is dead, and the ffsplit homepage is dead. – Vladimir Panteleev Apr 3 at 16:01
    
@VladimirPanteleev thanks for the feedback, it is indeed open source, and I have added a section on how to build it. Seems stackexchange people have found it necessary to delete nicely helpful posts <sigh>, updated the link, also mentioned ffsplit is dead now, though they were alive a few months ago, thanks for the feedback. – rogerdpack Apr 4 at 16:27
    
Based on github.com/rdp/virtual-audio-capture-grabber-device/blob/master/… it's not actually open-source at the moment (making the source code available is not enough). Since no license is specified, copyright laws apply by default, which means that no one can actually copy (distribute) your code. – Vladimir Panteleev Apr 4 at 18:03
1  
@VladimirPanteleev OK updated the license a bit. And added some more building instructions. Feel free to file issues if you can't get it to build or what not. The jruby code is for a "GUI wrapper" around FFmpeg to get it to work, and are not necessary for hacking on the directshow devices themselves. Cheers! – rogerdpack Apr 4 at 19:53
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Thank you. I really have no right to complain and it's nice that you've done this, sorry if I was overly grumpy. – Vladimir Panteleev Apr 6 at 2:48

Here is a good option to VAC as an audio device driver, not external software and is FREE without the lame "Trial" announcements.

http://vb-audio.pagesperso-orange.fr/Cable/index.htm

One single input/output device for free and 2 additional devices can be added with a donation.

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Works fine, thank you a lot ! – 131 Oct 27 '14 at 1:04

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