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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>
224 lines
3.0 KiB
ReStructuredText
224 lines
3.0 KiB
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
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.. _V4L2-PIX-FMT-NV12:
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.. _V4L2-PIX-FMT-NV21:
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******************************************************
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V4L2_PIX_FMT_NV12 ('NV12'), V4L2_PIX_FMT_NV21 ('NV21')
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******************************************************
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*man V4L2_PIX_FMT_NV12(2)*
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V4L2_PIX_FMT_NV21
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Formats with ½ horizontal and vertical chroma resolution, also known as
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YUV 4:2:0. One luminance and one chrominance plane with alternating
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chroma samples as opposed to ``V4L2_PIX_FMT_YVU420``
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Description
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===========
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These are two-plane versions of the YUV 4:2:0 format. The three
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components are separated into two sub-images or planes. The Y plane is
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first. The Y plane has one byte per pixel. For ``V4L2_PIX_FMT_NV12``, a
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combined CbCr plane immediately follows the Y plane in memory. The CbCr
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plane is the same width, in bytes, as the Y plane (and of the image),
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but is half as tall in pixels. Each CbCr pair belongs to four pixels.
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For example, Cb\ :sub:`0`/Cr\ :sub:`0` belongs to Y'\ :sub:`00`,
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Y'\ :sub:`01`, Y'\ :sub:`10`, Y'\ :sub:`11`. ``V4L2_PIX_FMT_NV21`` is
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the same except the Cb and Cr bytes are swapped, the CrCb plane starts
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with a Cr byte.
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If the Y plane has pad bytes after each row, then the CbCr plane has as
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many pad bytes after its rows.
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**Byte Order.**
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Each cell is one byte.
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.. tabularcolumns:: |p{5.8cm}|p{2.9cm}|p{2.9cm}|p{2.9cm}|p{3.0cm}|
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.. flat-table::
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:header-rows: 0
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:stub-columns: 0
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:widths: 2 1 1 1 1
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- .. row 1
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- start + 0:
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- Y'\ :sub:`00`
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- Y'\ :sub:`01`
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- Y'\ :sub:`02`
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- Y'\ :sub:`03`
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- .. row 2
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- start + 4:
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- Y'\ :sub:`10`
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- Y'\ :sub:`11`
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- Y'\ :sub:`12`
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- Y'\ :sub:`13`
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- .. row 3
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- start + 8:
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- Y'\ :sub:`20`
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- Y'\ :sub:`21`
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- Y'\ :sub:`22`
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- Y'\ :sub:`23`
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- .. row 4
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- start + 12:
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- Y'\ :sub:`30`
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- Y'\ :sub:`31`
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- Y'\ :sub:`32`
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- Y'\ :sub:`33`
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- .. row 5
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- start + 16:
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- Cb\ :sub:`00`
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- Cr\ :sub:`00`
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- Cb\ :sub:`01`
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- Cr\ :sub:`01`
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- .. row 6
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- start + 20:
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- Cb\ :sub:`10`
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- Cr\ :sub:`10`
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- Cb\ :sub:`11`
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- Cr\ :sub:`11`
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**Color Sample Location..**
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.. flat-table::
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:header-rows: 0
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:stub-columns: 0
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- .. row 1
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-
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- 0
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-
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- 1
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- 2
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-
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- 3
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- .. row 2
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- 0
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- Y
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-
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- Y
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- Y
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-
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- Y
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- .. row 3
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-
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-
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- C
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-
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-
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- C
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-
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- .. row 4
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- 1
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- Y
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-
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- Y
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- Y
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-
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- Y
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- .. row 5
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-
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- .. row 6
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- 2
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- Y
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-
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- Y
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- Y
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-
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- Y
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- .. row 7
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-
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-
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- C
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-
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-
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- C
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-
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- .. row 8
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- 3
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- Y
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-
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- Y
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- Y
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-
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- Y
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