Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 60 insertions, 0 deletions

diff --git a/Documentation/media/uapi/v4l/vidioc-enumaudioout.rst b/Documentation/media/uapi/v4l/vidioc-enumaudioout.rst
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+.. -*- coding: utf-8; mode: rst -*-
+
+.. _VIDIOC_ENUMAUDOUT:
+
+***********************
+ioctl VIDIOC_ENUMAUDOUT
+***********************
+
+Name
+====
+
+VIDIOC_ENUMAUDOUT - Enumerate audio outputs
+
+
+Synopsis
+========
+
+.. c:function:: int ioctl( int fd, VIDIOC_ENUMAUDOUT, struct v4l2_audioout *argp )
+    :name: VIDIOC_ENUMAUDOUT
+
+
+Arguments
+=========
+
+``fd``
+    File descriptor returned by :ref:`open() <func-open>`.
+
+``argp``
+    Pointer to struct :c:type:`v4l2_audioout`.
+
+
+Description
+===========
+
+To query the attributes of an audio output applications initialize the
+``index`` field and zero out the ``reserved`` array of a struct
+:c:type:`v4l2_audioout` and call the ``VIDIOC_G_AUDOUT``
+ioctl with a pointer to this structure. Drivers fill the rest of the
+structure or return an ``EINVAL`` error code when the index is out of
+bounds. To enumerate all audio outputs applications shall begin at index
+zero, incrementing by one until the driver returns ``EINVAL``.
+
+.. note::
+
+    Connectors on a TV card to loop back the received audio signal
+    to a sound card are not audio outputs in this sense.
+
+See :ref:`VIDIOC_G_AUDIOout <VIDIOC_G_AUDOUT>` for a description of struct
+:c:type:`v4l2_audioout`.
+
+
+Return Value
+============
+
+On success 0 is returned, on error -1 and the ``errno`` variable is set
+appropriately. The generic error codes are described at the
+:ref:`Generic Error Codes <gen-errors>` chapter.
+
+EINVAL
+    The number of the audio output is out of bounds.