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>
189 lines
3.3 KiB
ReStructuredText
189 lines
3.3 KiB
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
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.. _VIDIOC_G_JPEGCOMP:
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******************************************
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ioctl VIDIOC_G_JPEGCOMP, VIDIOC_S_JPEGCOMP
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******************************************
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Name
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====
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VIDIOC_G_JPEGCOMP - VIDIOC_S_JPEGCOMP
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Synopsis
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========
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.. cpp:function:: int ioctl( int fd, int request, v4l2_jpegcompression *argp )
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.. cpp:function:: int ioctl( int fd, int request, const v4l2_jpegcompression *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_JPEGCOMP, VIDIOC_S_JPEGCOMP
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``argp``
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Description
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===========
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These ioctls are **deprecated**. New drivers and applications should use
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:ref:`JPEG class controls <jpeg-controls>` for image quality and JPEG
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markers control.
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[to do]
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Ronald Bultje elaborates:
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APP is some application-specific information. The application can set it
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itself, and it'll be stored in the JPEG-encoded fields (eg; interlacing
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information for in an AVI or so). COM is the same, but it's comments,
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like 'encoded by me' or so.
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jpeg_markers describes whether the huffman tables, quantization tables
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and the restart interval information (all JPEG-specific stuff) should be
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stored in the JPEG-encoded fields. These define how the JPEG field is
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encoded. If you omit them, applications assume you've used standard
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encoding. You usually do want to add them.
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.. _v4l2-jpegcompression:
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.. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.7cm}|
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.. flat-table:: struct v4l2_jpegcompression
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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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- int
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- ``quality``
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- Deprecated. If
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:ref:`V4L2_CID_JPEG_COMPRESSION_QUALITY <jpeg-quality-control>`
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control is exposed by a driver applications should use it instead
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and ignore this field.
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- .. row 2
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- int
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- ``APPn``
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-
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- .. row 3
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- int
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- ``APP_len``
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-
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- .. row 4
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- char
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- ``APP_data``\ [60]
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-
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- .. row 5
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- int
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- ``COM_len``
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-
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- .. row 6
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- char
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- ``COM_data``\ [60]
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-
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- .. row 7
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- __u32
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- ``jpeg_markers``
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- See :ref:`jpeg-markers`. Deprecated. If
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:ref:`V4L2_CID_JPEG_ACTIVE_MARKER <jpeg-active-marker-control>`
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control is exposed by a driver applications should use it instead
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and ignore this field.
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.. _jpeg-markers:
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.. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.7cm}|
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.. flat-table:: JPEG Markers Flags
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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_JPEG_MARKER_DHT``
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- (1<<3)
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- Define Huffman Tables
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- .. row 2
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- ``V4L2_JPEG_MARKER_DQT``
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- (1<<4)
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- Define Quantization Tables
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- .. row 3
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- ``V4L2_JPEG_MARKER_DRI``
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- (1<<5)
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- Define Restart Interval
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- .. row 4
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- ``V4L2_JPEG_MARKER_COM``
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- (1<<6)
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- Comment segment
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- .. row 5
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- ``V4L2_JPEG_MARKER_APP``
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- (1<<7)
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- App segment, driver will always use APP0
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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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