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>
153 lines
2.9 KiB
ReStructuredText
153 lines
2.9 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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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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.. flat-table::
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:header-rows: 0
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:stub-columns: 0
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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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* - 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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* - 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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* - 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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* -
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* - start1 + 0:
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- Cb\ :sub:`00`
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- Cb\ :sub:`01`
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* - start1 + 2:
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- Cb\ :sub:`10`
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- Cb\ :sub:`11`
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* -
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* - start2 + 0:
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- Cr\ :sub:`00`
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- Cr\ :sub:`01`
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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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* -
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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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