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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>
127 lines
3.0 KiB
ReStructuredText
127 lines
3.0 KiB
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
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.. _VIDIOC_G_AUDOUT:
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**************************************
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ioctl VIDIOC_G_AUDOUT, VIDIOC_S_AUDOUT
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**************************************
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Name
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====
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VIDIOC_G_AUDOUT - VIDIOC_S_AUDOUT - Query or select the current audio output
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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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.. cpp:function:: int ioctl( int fd, int request, const 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_G_AUDOUT, VIDIOC_S_AUDOUT
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``argp``
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Description
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===========
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To query the current audio output applications zero out the ``reserved``
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array of a struct :ref:`v4l2_audioout <v4l2-audioout>` and call the
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``VIDIOC_G_AUDOUT`` ioctl with a pointer to this structure. Drivers fill
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the rest of the structure or return an ``EINVAL`` error code when the device
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has no audio inputs, or none which combine with the current video
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output.
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Audio outputs have no writable properties. Nevertheless, to select the
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current audio output applications can initialize the ``index`` field and
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``reserved`` array (which in the future may contain writable properties)
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of a :ref:`struct v4l2_audioout <v4l2-audioout>` structure and call the
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``VIDIOC_S_AUDOUT`` ioctl. Drivers switch to the requested output or
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return the ``EINVAL`` error code when the index is out of bounds. This is a
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write-only ioctl, it does not return the current audio output attributes
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as ``VIDIOC_G_AUDOUT`` does.
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.. note::
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Connectors on a TV card to loop back the received audio signal
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to a sound card are not audio outputs in this sense.
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.. _v4l2-audioout:
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.. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.7cm}|
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.. flat-table:: struct v4l2_audioout
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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 audio output, set by the driver or 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 audio output, a NUL-terminated ASCII string, for
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example: "Line Out". 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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- ``capability``
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- Audio capability flags, none defined yet. Drivers must set this
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field to zero.
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- .. row 4
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- __u32
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- ``mode``
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- Audio mode, none defined yet. Drivers and applications (on
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``VIDIOC_S_AUDOUT``) must set this field to zero.
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- .. row 5
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- __u32
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- ``reserved``\ [2]
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- Reserved for future extensions. Drivers and applications must set
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the array to zero.
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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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No audio outputs combine with the current video output, or the
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number of the selected audio output is out of bounds or it does not
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combine.
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