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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>
113 lines
3.4 KiB
ReStructuredText
113 lines
3.4 KiB
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
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.. _VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL:
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***************************************
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ioctl VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL
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***************************************
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Name
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====
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VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL - Enumerate frame intervals
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Synopsis
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========
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.. c:function:: int ioctl( int fd, VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL, struct v4l2_subdev_frame_interval_enum * argp )
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:name: VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL
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Arguments
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=========
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``fd``
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File descriptor returned by :ref:`open() <func-open>`.
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``argp``
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Description
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===========
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This ioctl lets applications enumerate available frame intervals on a
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given sub-device pad. Frame intervals only makes sense for sub-devices
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that can control the frame period on their own. This includes, for
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instance, image sensors and TV tuners.
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For the common use case of image sensors, the frame intervals available
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on the sub-device output pad depend on the frame format and size on the
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same pad. Applications must thus specify the desired format and size
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when enumerating frame intervals.
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To enumerate frame intervals applications initialize the ``index``,
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``pad``, ``which``, ``code``, ``width`` and ``height`` fields of struct
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:c:type:`v4l2_subdev_frame_interval_enum`
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and call the :ref:`VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL` ioctl with a pointer
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to this structure. Drivers fill the rest of the structure or return an
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EINVAL error code if one of the input fields is invalid. All frame
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intervals are enumerable by beginning at index zero and incrementing by
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one until ``EINVAL`` is returned.
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Available frame intervals may depend on the current 'try' formats at
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other pads of the sub-device, as well as on the current active links.
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See :ref:`VIDIOC_SUBDEV_G_FMT` for more
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information about the try formats.
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Sub-devices that support the frame interval enumeration ioctl should
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implemented it on a single pad only. Its behaviour when supported on
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multiple pads of the same sub-device is not defined.
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.. c:type:: v4l2_subdev_frame_interval_enum
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.. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.7cm}|
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.. flat-table:: struct v4l2_subdev_frame_interval_enum
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:header-rows: 0
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:stub-columns: 0
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:widths: 1 1 2
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* - __u32
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- ``index``
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- Number of the format in the enumeration, set by the application.
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* - __u32
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- ``pad``
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- Pad number as reported by the media controller API.
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* - __u32
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- ``code``
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- The media bus format code, as defined in
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:ref:`v4l2-mbus-format`.
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* - __u32
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- ``width``
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- Frame width, in pixels.
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* - __u32
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- ``height``
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- Frame height, in pixels.
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* - struct :c:type:`v4l2_fract`
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- ``interval``
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- Period, in seconds, between consecutive video frames.
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* - __u32
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- ``which``
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- Frame intervals to be enumerated, from enum
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:ref:`v4l2_subdev_format_whence <v4l2-subdev-format-whence>`.
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* - __u32
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- ``reserved``\ [8]
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- Reserved for future extensions. Applications and drivers must set
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the array to zero.
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Return Value
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============
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On success 0 is returned, on error -1 and the ``errno`` variable is set
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appropriately. The generic error codes are described at the
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:ref:`Generic Error Codes <gen-errors>` chapter.
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EINVAL
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The struct
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:c:type:`v4l2_subdev_frame_interval_enum`
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``pad`` references a non-existing pad, one of the ``code``,
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``width`` or ``height`` fields are invalid for the given pad or the
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``index`` field is out of bounds.
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