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Re: [Qemu-devel] [PATCH 12/25] audio: basic support for multi backend au

From: Marc-André Lureau
Subject: Re: [Qemu-devel] [PATCH 12/25] audio: basic support for multi backend audio
Date: Fri, 21 Aug 2015 16:24:59 +0200


On Fri, Aug 21, 2015 at 2:23 PM, Kővágó Zoltán <address@hidden> wrote:
> Hmm.  Maybe it would make more sense, but it's not how the audio system
> works.  The situation cyrrently (before my patch) is the following:
> VNC/spice/wavcapture attaches a capture to the global AudioState and starts
> recording/transmitting the mixed together audio of all connected guest sound
> cards.

Ok, thanks for explaining.

> Now with more audiodevs, you have to specify which one you wan't to capture
> from.  If there's multiple sound cards attached to a single audiodev
> (AudioState), then we will transmit the mix of them.  (If there's only one
> attached though, then we will only transmit that...)
> To support capture from a single guest device would require some rewriting
> of the audio capture logic, in a backward compatible way (which would mean
> support both capturing form a single card and capturing a mix of all cards.
> And in the latter case we still need some way to specify audiodev...)

Forget about that for now then :)


Marc-André Lureau

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