2016-06-30 21:18:56 +08:00
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.. -*- coding: utf-8; mode: rst -*-
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.. _V4L2-PIX-FMT-YUV422P:
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*****************************
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V4L2_PIX_FMT_YUV422P ('422P')
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*****************************
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Format with ½ horizontal chroma resolution, also known as YUV 4:2:2.
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Planar layout as opposed to ``V4L2_PIX_FMT_YUYV``
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Description
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===========
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This format is not commonly used. This is a planar version of the YUYV
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format. The three components are separated into three sub-images or
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planes. The Y plane is first. The Y plane has one byte per pixel. The Cb
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plane immediately follows the Y plane in memory. The Cb plane is half
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the width of the Y plane (and of the image). Each Cb belongs to two
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pixels. For example, Cb\ :sub:`0` belongs to Y'\ :sub:`00`,
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Y'\ :sub:`01`. Following the Cb plane is the Cr plane, just like the Cb
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plane.
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If the Y plane has pad bytes after each row, then the Cr and Cb 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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2016-07-05 00:58:01 +08:00
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**Byte Order.**
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2016-06-30 21:18:56 +08:00
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Each cell is one byte.
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[media] docs-rst: add tabularcolumns to all tables
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>
2016-08-17 19:14:19 +08:00
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2016-06-30 21:18:56 +08:00
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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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- 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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- Cb\ :sub:`01`
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- .. row 6
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- start + 18:
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- Cb\ :sub:`10`
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- Cb\ :sub:`11`
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- .. row 7
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- start + 20:
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- Cb\ :sub:`20`
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- Cb\ :sub:`21`
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- .. row 8
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- start + 22:
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- Cb\ :sub:`30`
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- Cb\ :sub:`31`
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- .. row 9
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- start + 24:
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- Cr\ :sub:`00`
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- Cr\ :sub:`01`
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- .. row 10
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- start + 26:
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- Cr\ :sub:`10`
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- Cr\ :sub:`11`
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- .. row 11
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- start + 28:
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- Cr\ :sub:`20`
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- Cr\ :sub:`21`
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- .. row 12
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- start + 30:
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- Cr\ :sub:`30`
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- Cr\ :sub:`31`
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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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2016-07-05 03:25:48 +08:00
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-
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2016-06-30 21:18:56 +08:00
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- 0
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2016-07-05 03:25:48 +08:00
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-
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2016-06-30 21:18:56 +08:00
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- 1
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- 2
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2016-07-05 03:25:48 +08:00
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-
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2016-06-30 21:18:56 +08:00
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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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- C
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- Y
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- Y
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- C
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- Y
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- .. row 3
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- 1
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- Y
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- C
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- Y
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- Y
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- C
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- Y
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- .. row 4
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- 2
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- Y
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- C
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- Y
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- Y
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- C
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- Y
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- .. row 5
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- 3
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- Y
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- C
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- Y
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- Y
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- C
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- Y
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