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docs: domain: document legacy audio for qemu

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Adding a blurb like this was forgotten in 2009.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
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Olaf Hering 2022-01-12 13:42:00 +01:00 committed by Andrea Bolognani
parent 161727417a
commit 31d461f575
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docs/formatdomain.rst
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@ -7105,6 +7105,20 @@ is permitted with the following attributes.
The audio format, one of ``s8``, ``u8``, ``s16``, ``u16``,
``s32``, ``u32``, ``f32``. The default is hypervisor specific.
Note:
If no ``<audio/>`` element is defined, and the ``graphics`` element is set to
either 'vnc' or 'sdl', the libvirtd or virtqemud process will honor the following
environment variables:
* ``SDL_AUDIODRIVER``
Valid values are 'pulseaudio', 'esd', 'alsa' or 'arts'.
* ``QEMU_AUDIO_DRV``
Valid values are 'pa', 'none', 'alsa', 'coreaudio', 'jack', 'oss',
'sdl', 'spice' or 'wav'.
None audio backend
^^^^^^^^^^^^^^^^^^