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Linux/Documentation/userspace-api/media/v4l/vidioc-enumaudioout.rst

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  1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
  2 .. c:namespace:: V4L
  3 
  4 .. _VIDIOC_ENUMAUDOUT:
  5 
  6 ***********************
  7 ioctl VIDIOC_ENUMAUDOUT
  8 ***********************
  9 
 10 Name
 11 ====
 12 
 13 VIDIOC_ENUMAUDOUT - Enumerate audio outputs
 14 
 15 Synopsis
 16 ========
 17 
 18 .. c:macro:: VIDIOC_ENUMAUDOUT
 19 
 20 ``int ioctl(int fd, VIDIOC_ENUMAUDOUT, struct v4l2_audioout *argp)``
 21 
 22 Arguments
 23 =========
 24 
 25 ``fd``
 26     File descriptor returned by :c:func:`open()`.
 27 
 28 ``argp``
 29     Pointer to struct :c:type:`v4l2_audioout`.
 30 
 31 Description
 32 ===========
 33 
 34 To query the attributes of an audio output applications initialize the
 35 ``index`` field and zero out the ``reserved`` array of a struct
 36 :c:type:`v4l2_audioout` and call the ``VIDIOC_G_AUDOUT``
 37 ioctl with a pointer to this structure. Drivers fill the rest of the
 38 structure or return an ``EINVAL`` error code when the index is out of
 39 bounds. To enumerate all audio outputs applications shall begin at index
 40 zero, incrementing by one until the driver returns ``EINVAL``.
 41 
 42 .. note::
 43 
 44     Connectors on a TV card to loop back the received audio signal
 45     to a sound card are not audio outputs in this sense.
 46 
 47 See :ref:`VIDIOC_G_AUDIOout <VIDIOC_G_AUDOUT>` for a description of struct
 48 :c:type:`v4l2_audioout`.
 49 
 50 Return Value
 51 ============
 52 
 53 On success 0 is returned, on error -1 and the ``errno`` variable is set
 54 appropriately. The generic error codes are described at the
 55 :ref:`Generic Error Codes <gen-errors>` chapter.
 56 
 57 EINVAL
 58     The number of the audio output is out of bounds.

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