64e4954619
The conversion script added some comments at the end. They point to the original DocBook files, with will be removed after the manual fixes. So, they'll be pointing to nowere. So, remove those comments. They'll be forever stored at the Kernel tree. So, if someone wants the references, it is just a matter of looking at the backlog. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
58 lines
1.4 KiB
ReStructuredText
58 lines
1.4 KiB
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
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.. _VIDIOC_ENUMAUDIOOUT:
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***********************
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ioctl VIDIOC_ENUMAUDOUT
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***********************
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*man VIDIOC_ENUMAUDOUT(2)*
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Enumerate audio outputs
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Synopsis
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========
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.. cpp:function:: int ioctl( int fd, int request, struct v4l2_audioout *argp )
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Arguments
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=========
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``fd``
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File descriptor returned by :ref:`open() <func-open>`.
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``request``
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VIDIOC_ENUMAUDOUT
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``argp``
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Description
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===========
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To query the attributes of an audio output applications initialize the
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``index`` field and zero out the ``reserved`` array of a struct
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:ref:`v4l2_audioout <v4l2-audioout>` and call the ``VIDIOC_G_AUDOUT``
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ioctl with a pointer to this structure. Drivers fill the rest of the
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structure or return an ``EINVAL`` error code when the index is out of
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bounds. To enumerate all audio outputs applications shall begin at index
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zero, incrementing by one until the driver returns ``EINVAL``.
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Note connectors on a TV card to loop back the received audio signal to a
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sound card are not audio outputs in this sense.
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See :ref:`VIDIOC_G_AUDIOout <VIDIOC_G_AUDIOout>` for a description of struct
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:ref:`v4l2_audioout <v4l2-audioout>`.
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Return Value
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============
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On success 0 is returned, on error -1 and the ``errno`` variable is set
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appropriately. The generic error codes are described at the
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:ref:`Generic Error Codes <gen-errors>` chapter.
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EINVAL
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The number of the audio output is out of bounds.
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