mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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5bd4bb7817
LaTeX doesn't handle too well auto-width on tables, and ReST
markup requires an special tag to give it the needed hints.
As we're using A4 paper, we have 17cm of useful spaces. As
most media tables have widths, let's use it to generate the
needed via the following perl script:
my ($line_size, $table_header, $has_cols) = (17.5, 0, 0);
my $out;
my $header = "";
my @widths = ();
sub round { $_[0] > 0 ? int($_[0] + .5) : -int(-$_[0] + .5) }
while (<>) {
if (!$table_header) {
$has_cols = 1 if (m/..\s+tabularcolumns::/);
if (m/..\s+flat-table::/) {
$table_header = 1;
$header = $_;
next;
}
$out .= $_;
next;
}
$header .= $_;
@widths = split(/ /, $1) if (m/:widths:\s+(.*)/);
if (m/^\n$/) {
if (!$has_cols && @widths) {
my ($tot, $t, $i) = (0, 0, 0);
foreach my $v(@widths) { $tot += $v; };
$out .= ".. tabularcolumns:: |";
for ($i = 0; $i < scalar @widths - 1; $i++) {
my $v = $widths[$i];
my $w = round(10 * ($v * $line_size) / $tot) / 10;
$out .= sprintf "p{%.1fcm}|", $w;
$t += $w;
}
my $w = $line_size - $t;
$out .= sprintf "p{%.1fcm}|\n\n", $w;
}
$out .= $header;
$table_header = 0;
$has_cols = 0;
$header = "";
@widths = ();
}
}
print $out;
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
229 lines
4.6 KiB
ReStructuredText
229 lines
4.6 KiB
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
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.. _VIDIOC_ENUMOUTPUT:
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***********************
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ioctl VIDIOC_ENUMOUTPUT
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***********************
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Name
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====
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VIDIOC_ENUMOUTPUT - Enumerate video outputs
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Synopsis
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========
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.. cpp:function:: int ioctl( int fd, int request, struct v4l2_output *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_ENUMOUTPUT
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``argp``
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Description
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===========
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To query the attributes of a video outputs applications initialize the
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``index`` field of struct :ref:`v4l2_output <v4l2-output>` and call
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the :ref:`VIDIOC_ENUMOUTPUT` ioctl with a pointer to this structure.
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Drivers fill the rest of the structure or return an ``EINVAL`` error code
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when the index is out of bounds. To enumerate all outputs applications
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shall begin at index zero, incrementing by one until the driver returns
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EINVAL.
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.. _v4l2-output:
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.. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.7cm}|
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.. flat-table:: struct v4l2_output
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:header-rows: 0
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:stub-columns: 0
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:widths: 1 1 2
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- .. row 1
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- __u32
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- ``index``
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- Identifies the output, set by the application.
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- .. row 2
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- __u8
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- ``name``\ [32]
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- Name of the video output, a NUL-terminated ASCII string, for
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example: "Vout". This information is intended for the user,
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preferably the connector label on the device itself.
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- .. row 3
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- __u32
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- ``type``
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- Type of the output, see :ref:`output-type`.
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- .. row 4
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- __u32
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- ``audioset``
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- Drivers can enumerate up to 32 video and audio outputs. This field
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shows which audio outputs were selectable as the current output if
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this was the currently selected video output. It is a bit mask.
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The LSB corresponds to audio output 0, the MSB to output 31. Any
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number of bits can be set, or none.
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When the driver does not enumerate audio outputs no bits must be
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set. Applications shall not interpret this as lack of audio
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support. Drivers may automatically select audio outputs without
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enumerating them.
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For details on audio outputs and how to select the current output
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see :ref:`audio`.
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- .. row 5
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- __u32
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- ``modulator``
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- Output devices can have zero or more RF modulators. When the
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``type`` is ``V4L2_OUTPUT_TYPE_MODULATOR`` this is an RF connector
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and this field identifies the modulator. It corresponds to struct
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:ref:`v4l2_modulator <v4l2-modulator>` field ``index``. For
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details on modulators see :ref:`tuner`.
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- .. row 6
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- :ref:`v4l2_std_id <v4l2-std-id>`
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- ``std``
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- Every video output supports one or more different video standards.
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This field is a set of all supported standards. For details on
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video standards and how to switch see :ref:`standard`.
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- .. row 7
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- __u32
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- ``capabilities``
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- This field provides capabilities for the output. See
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:ref:`output-capabilities` for flags.
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- .. row 8
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- __u32
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- ``reserved``\ [3]
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- Reserved for future extensions. Drivers must set the array to
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zero.
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.. _output-type:
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.. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.7cm}|
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.. flat-table:: Output Type
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:header-rows: 0
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:stub-columns: 0
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:widths: 3 1 4
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- .. row 1
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- ``V4L2_OUTPUT_TYPE_MODULATOR``
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- 1
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- This output is an analog TV modulator.
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- .. row 2
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- ``V4L2_OUTPUT_TYPE_ANALOG``
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- 2
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- Analog baseband output, for example Composite / CVBS, S-Video,
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RGB.
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- .. row 3
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- ``V4L2_OUTPUT_TYPE_ANALOGVGAOVERLAY``
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- 3
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- [?]
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.. _output-capabilities:
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.. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.7cm}|
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.. flat-table:: Output capabilities
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:header-rows: 0
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:stub-columns: 0
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:widths: 3 1 4
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- .. row 1
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- ``V4L2_OUT_CAP_DV_TIMINGS``
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- 0x00000002
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- This output supports setting video timings by using
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VIDIOC_S_DV_TIMINGS.
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- .. row 2
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- ``V4L2_OUT_CAP_STD``
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- 0x00000004
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- This output supports setting the TV standard by using
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VIDIOC_S_STD.
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- .. row 3
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- ``V4L2_OUT_CAP_NATIVE_SIZE``
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- 0x00000008
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- This output supports setting the native size using the
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``V4L2_SEL_TGT_NATIVE_SIZE`` selection target, see
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:ref:`v4l2-selections-common`.
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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 struct :ref:`v4l2_output <v4l2-output>` ``index`` is out of
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bounds.
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