mirror of
https://github.com/edk2-porting/linux-next.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>
257 lines
3.5 KiB
ReStructuredText
257 lines
3.5 KiB
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
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.. _V4L2-PIX-FMT-YUV420M:
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.. _v4l2-pix-fmt-yvu420m:
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************************************************************
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V4L2_PIX_FMT_YUV420M ('YM12'), V4L2_PIX_FMT_YVU420M ('YM21')
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************************************************************
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*man V4L2_PIX_FMT_YUV420M(2)*
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V4L2_PIX_FMT_YVU420M
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Variation of ``V4L2_PIX_FMT_YUV420`` and ``V4L2_PIX_FMT_YVU420`` with
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planes non contiguous in memory.
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Description
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===========
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This is a multi-planar format, as opposed to a packed format. The three
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components are separated into three sub-images or planes.
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The Y plane is first. The Y plane has one byte per pixel. For
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``V4L2_PIX_FMT_YUV420M`` the Cb data constitutes the second plane which
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is half the width and half the height of the Y plane (and of the image).
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Each Cb belongs to four pixels, a two-by-two square of the image. For
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example, Cb\ :sub:`0` belongs to Y'\ :sub:`00`, Y'\ :sub:`01`,
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Y'\ :sub:`10`, and Y'\ :sub:`11`. The Cr data, just like the Cb plane,
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is in the third plane.
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``V4L2_PIX_FMT_YVU420M`` is the same except the Cr data is stored in the
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second plane and the Cb data in the third plane.
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If the Y plane has pad bytes after each row, then the Cb and Cr planes
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have half as many pad bytes after their rows. In other words, two Cx
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rows (including padding) is exactly as long as one Y row (including
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padding).
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``V4L2_PIX_FMT_YUV420M`` and ``V4L2_PIX_FMT_YVU420M`` are intended to be
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used only in drivers and applications that support the multi-planar API,
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described in :ref:`planar-apis`.
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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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- start0 + 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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- start0 + 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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- start0 + 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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- start0 + 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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-
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- .. row 6
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- start1 + 0:
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- Cb\ :sub:`00`
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- Cb\ :sub:`01`
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- .. row 7
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- start1 + 2:
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- Cb\ :sub:`10`
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- Cb\ :sub:`11`
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- .. row 8
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-
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- .. row 9
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- start2 + 0:
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- Cr\ :sub:`00`
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- Cr\ :sub:`01`
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- .. row 10
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- start2 + 2:
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- Cr\ :sub:`10`
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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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-
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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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-
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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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-
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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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-
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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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-
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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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-
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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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-
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- Y
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-
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- Y
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