Re: [PULL 15/26] audio: add mixeng option (documentation)

[Eric Blake <eblake@redhat.com>]

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On 9/19/19 3:36 AM, Gerd Hoffmann wrote:
> From: Kővágó, Zoltán <dirty.ice.hu@gmail.com>
> 
> This will allow us to disable mixeng when we use a decent backend.
> 
> Disabling mixeng have a few advantages:
> * we no longer convert the audio output from one format to another, when
>   the underlying audio system would just convert it to a third format.
>   We no longer convert, only the underlying system, when needed.
> * the underlying system probably has better resampling and sample format
>   converting methods anyway...
> * we may support formats that the mixeng currently does not support (S24
>   or float samples, more than two channels)
> * when using an audio server (like pulseaudio) different sound card
>   outputs will show up as separate streams, even if we use only one
>   backend
> 
> Disadvantages:
> * audio capturing no longer works (wavcapture, and vnc audio extension)
> * some backends only support a single playback stream or very picky
>   about the audio format.  In this case we can't disable mixeng.
> 
> However mixeng is not removed, only made optional, so this shouldn't be
> a big concern.
> 

> +++ b/qemu-options.hx
> @@ -433,6 +433,7 @@ DEF("audiodev", HAS_ARG, QEMU_OPTION_audiodev,
>      "                specifies the audio backend to use\n"
>      "                id= identifier of the backend\n"
>      "                timer-period= timer period in microseconds\n"
> +    "                in|out.mixing-engineeng= use mixing engine to mix streams inside QEMU\n"

s/engineeng/engine/

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org


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