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Is there a free or open-source equivalent to Virtual Audio Cable for Windows?

I want to install a virtual sound card on Windows XP so I can stream the sound of a monitoring software on an ESX virtual machine which doesn't have a sound card.

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I was searching for such a thing recently (for this question: superuser.com/questions/88895/virtual-microphone-and-skype), and haven't found anything else for the same task. Maybe someone else will find, though. – Gnoupi Jan 21 '10 at 11:05
What do you wanna achieve with it? It might be easier to us to suggest a solution with knowing the purpose. – Bobby Jan 21 '10 at 11:12
I try to stream the sound of a monitoring software on an esx virtual machine wich don't has a sound card. – Adrien Jan 21 '10 at 11:20
Have you seen jack? jackaudio.org – Sam Jan 27 '10 at 0:02
Yes i've seen it, but can I use jack without modify my monitoring software on windows ? – Adrien Jan 27 '10 at 8:29
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3 Answers

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Not quite an open-source solution both both of these are zero cost

If your ESX virtual machine runs windows:

RDP (i.e. a remote desktop connection) can already support transporting audio with a little more config

If your ESX virtual machine runs linux:

Try NX as a remote access solution (The free edition supports 2 users and has multi-media support)

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While loooking for something similar, I also found http://www.clingman.org/winesd/ which could potentially be used as a rudimentary starting point for a project aiming at providing a virtual sound card.

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The hard part is actually building the driver, since it requires the appropriate DDK. – Ignacio Vazquez-Abrams Jun 30 '10 at 21:30
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@Ignacio: when you have XP, it's not really that hard. Things are much worse with Vista/7 (especially x64) with their driver signing policy... – whitequark Aug 3 '10 at 1:26
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Basically I programmed this as an open source (free) competitor to virtual audio cable. Ping me if you want me to convert it into a "real" kernel level audio device so that any program can use it, not just directshow compatible ones.

https://github.com/rdp/virtual-audio-capture-grabber-device

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