c2b66cafdf
Shorten the tables by removing row numbers in comments, allowing for
later insertion of rows with minimal diffs.
All changes have been generated by the following script.
import io
import re
import sys
def process_table(fname, data):
if fname.endswith('hist-v4l2.rst'):
data = re.sub(u'\n{1,2}\t( ?) -( ?) ?', u'\n\t\\1 -\\2', data, flags = re.MULTILINE)
data = re.sub(u'\n(\t| )- \.\. row [0-9]+\n\t ?-( ?) ?', u'\\1* -\\2', data, flags = re.MULTILINE)
else:
data = re.sub(u'\n{1,2} -( ?) ?', u'\n -\\1', data, flags = re.MULTILINE)
data = re.sub(u'(\n?)(\n\n - \.\. row 1\n)', u'\n\\2', data, flags = re.MULTILINE)
data = re.sub(u'\n - \.\. row [0-9]+\n -( ?) ?', u' * -\\1', data, flags = re.MULTILINE)
data = re.sub(u'\n - \.\. row [0-9]+\n \.\. (_[A-Z0-9_`-]*:)', u'\n - .. \\1', data, flags = re.MULTILINE)
data = re.sub(u'\n - \.\. (_[A-Z0-9_`-]*:)\n -', u' * .. \\1\n\n -', data, flags = re.MULTILINE)
data = re.sub(u'^ - ', u' -', data, flags = re.MULTILINE)
data = re.sub(u'^(\t{1,2}) ', u'\\1', data, flags = re.MULTILINE)
return data
def process_file(fname, data):
buf = io.StringIO(data)
output = ''
in_table = False
table_separator = 0
for line in buf.readlines():
if line.find('.. flat-table::') != -1:
in_table = True
table = ''
elif in_table and not re.match('^[\t\n]|( )', line):
in_table = False
output += process_table(fname, table)
if in_table:
table += line
else:
output += line
if in_table:
in_table = False
output += process_table(fname, table)
return output
fname = sys.argv[1]
data = file(fname, 'rb').read().decode('utf-8')
data = process_file(fname, data)
file(fname, 'wb').write(data.encode('utf-8'))
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
144 lines
2.6 KiB
ReStructuredText
144 lines
2.6 KiB
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
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.. _V4L2-PIX-FMT-YVU420:
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.. _V4L2-PIX-FMT-YUV420:
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**********************************************************
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V4L2_PIX_FMT_YVU420 ('YV12'), V4L2_PIX_FMT_YUV420 ('YU12')
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**********************************************************
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V4L2_PIX_FMT_YUV420
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Planar formats with ½ horizontal and vertical chroma resolution, also
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known as YUV 4:2:0
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Description
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===========
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These are planar formats, as opposed to a packed format. The three
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components are separated into three sub- images or planes. The Y plane
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is first. The Y plane has one byte per pixel. For
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``V4L2_PIX_FMT_YVU420``, the Cr plane immediately follows the Y plane in
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memory. The Cr plane is half the width and half the height of the Y
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plane (and of the image). Each Cr belongs to four pixels, a two-by-two
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square of the image. For example, Cr\ :sub:`0` belongs to Y'\ :sub:`00`,
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Y'\ :sub:`01`, Y'\ :sub:`10`, and Y'\ :sub:`11`. Following the Cr plane
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is the Cb plane, just like the Cr plane. ``V4L2_PIX_FMT_YUV420`` is the
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same except the Cb plane comes first, then the Cr 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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**Byte Order.**
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Each cell is one byte.
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.. flat-table::
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:header-rows: 0
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:stub-columns: 0
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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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* - 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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* - 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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* - 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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* - start + 16:
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- Cr\ :sub:`00`
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- Cr\ :sub:`01`
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* - start + 18:
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- Cr\ :sub:`10`
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- Cr\ :sub:`11`
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* - start + 20:
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- Cb\ :sub:`00`
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- Cb\ :sub:`01`
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* - start + 22:
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- Cb\ :sub:`10`
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- Cb\ :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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* -
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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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* - 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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* -
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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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* - 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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* -
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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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* -
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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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* - 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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