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>
145 lines
3.1 KiB
ReStructuredText
145 lines
3.1 KiB
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
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.. _V4L2-PIX-FMT-NV12M:
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.. _v4l2-pix-fmt-nv12mt-16x16:
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.. _V4L2-PIX-FMT-NV21M:
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***********************************************************************************
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V4L2_PIX_FMT_NV12M ('NM12'), V4L2_PIX_FMT_NV21M ('NM21'), V4L2_PIX_FMT_NV12MT_16X16
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***********************************************************************************
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V4L2_PIX_FMT_NV21M
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V4L2_PIX_FMT_NV12MT_16X16
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Variation of ``V4L2_PIX_FMT_NV12`` and ``V4L2_PIX_FMT_NV21`` with planes
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non contiguous in memory.
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Description
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===========
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This is a multi-planar, two-plane version of the YUV 4:2:0 format. The
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three components are separated into two sub-images or planes.
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``V4L2_PIX_FMT_NV12M`` differs from ``V4L2_PIX_FMT_NV12`` in that the
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two planes are non-contiguous in memory, i.e. the chroma plane do not
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necessarily immediately follows the luma plane. The luminance data
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occupies the first plane. The Y plane has one byte per pixel. In the
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second plane there is a chrominance data with alternating chroma
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samples. The CbCr plane is the same width, in bytes, as the Y plane (and
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of the image), but is half as tall in pixels. Each CbCr pair belongs to
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four pixels. For example, Cb\ :sub:`0`/Cr\ :sub:`0` belongs to
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Y'\ :sub:`00`, Y'\ :sub:`01`, Y'\ :sub:`10`, Y'\ :sub:`11`.
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``V4L2_PIX_FMT_NV12MT_16X16`` is the tiled version of
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``V4L2_PIX_FMT_NV12M`` with 16x16 macroblock tiles. Here pixels are
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arranged in 16x16 2D tiles and tiles are arranged in linear order in
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memory. ``V4L2_PIX_FMT_NV21M`` is the same as ``V4L2_PIX_FMT_NV12M``
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except the Cb and Cr bytes are swapped, the CrCb plane starts with a Cr
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byte.
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``V4L2_PIX_FMT_NV12M`` is intended to be used only in drivers and
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applications that support the multi-planar API, described in
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:ref:`planar-apis`.
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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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.. 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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- Cr\ :sub:`00`
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- Cb\ :sub:`01`
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- Cr\ :sub:`01`
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* - start1 + 4:
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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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* -
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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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* - 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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* -
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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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* - 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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* -
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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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* -
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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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- Y
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-
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- Y
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