Synopsis
========
-.. cpp:function:: int ioctl( int fd, int request, struct v4l2_standard *argp )
+.. c:function:: int ioctl( int fd, VIDIOC_ENUMSTD, struct v4l2_standard *argp )
+ :name: VIDIOC_ENUMSTD
Arguments
``fd``
File descriptor returned by :ref:`open() <func-open>`.
-``request``
- VIDIOC_ENUMSTD
-
``argp``
To query the attributes of a video standard, especially a custom (driver
defined) one, applications initialize the ``index`` field of struct
-:ref:`v4l2_standard <v4l2-standard>` and call the :ref:`VIDIOC_ENUMSTD`
+:c:type:`v4l2_standard` and call the :ref:`VIDIOC_ENUMSTD`
ioctl with a pointer to this structure. Drivers fill the rest of the
structure or return an ``EINVAL`` error code when the index is out of
bounds. To enumerate all standards applications shall begin at index
or output. [#f1]_
-.. _v4l2-standard:
+.. c:type:: v4l2_standard
.. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.7cm}|
:stub-columns: 0
:widths: 1 1 2
-
- - .. row 1
-
- - __u32
-
- - ``index``
-
- - Number of the video standard, set by the application.
-
- - .. row 2
-
- - :ref:`v4l2_std_id <v4l2-std-id>`
-
- - ``id``
-
- - The bits in this field identify the standard as one of the common
- standards listed in :ref:`v4l2-std-id`, or if bits 32 to 63 are
- set as custom standards. Multiple bits can be set if the hardware
- does not distinguish between these standards, however separate
- indices do not indicate the opposite. The ``id`` must be unique.
- No other enumerated :ref:`struct v4l2_standard <v4l2-standard>` structure,
- for this input or output anyway, can contain the same set of bits.
-
- - .. row 3
-
- - __u8
-
- - ``name``\ [24]
-
- - Name of the standard, a NUL-terminated ASCII string, for example:
- "PAL-B/G", "NTSC Japan". This information is intended for the
- user.
-
- - .. row 4
-
- - struct :ref:`v4l2_fract <v4l2-fract>`
-
- - ``frameperiod``
-
- - The frame period (not field period) is numerator / denominator.
- For example M/NTSC has a frame period of 1001 / 30000 seconds.
-
- - .. row 5
-
- - __u32
-
- - ``framelines``
-
- - Total lines per frame including blanking, e. g. 625 for B/PAL.
-
- - .. row 6
-
- - __u32
-
- - ``reserved``\ [4]
-
- - Reserved for future extensions. Drivers must set the array to
- zero.
-
-
-
-.. _v4l2-fract:
+ * - __u32
+ - ``index``
+ - Number of the video standard, set by the application.
+ * - :ref:`v4l2_std_id <v4l2-std-id>`
+ - ``id``
+ - The bits in this field identify the standard as one of the common
+ standards listed in :ref:`v4l2-std-id`, or if bits 32 to 63 are
+ set as custom standards. Multiple bits can be set if the hardware
+ does not distinguish between these standards, however separate
+ indices do not indicate the opposite. The ``id`` must be unique.
+ No other enumerated struct :c:type:`v4l2_standard` structure,
+ for this input or output anyway, can contain the same set of bits.
+ * - __u8
+ - ``name``\ [24]
+ - Name of the standard, a NUL-terminated ASCII string, for example:
+ "PAL-B/G", "NTSC Japan". This information is intended for the
+ user.
+ * - struct :c:type:`v4l2_fract`
+ - ``frameperiod``
+ - The frame period (not field period) is numerator / denominator.
+ For example M/NTSC has a frame period of 1001 / 30000 seconds.
+ * - __u32
+ - ``framelines``
+ - Total lines per frame including blanking, e. g. 625 for B/PAL.
+ * - __u32
+ - ``reserved``\ [4]
+ - Reserved for future extensions. Drivers must set the array to
+ zero.
+
+
+
+.. c:type:: v4l2_fract
.. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.7cm}|
:stub-columns: 0
:widths: 1 1 2
-
- - .. row 1
-
- - __u32
-
- - ``numerator``
-
- -
-
- - .. row 2
-
- - __u32
-
- - ``denominator``
-
- -
+ * - __u32
+ - ``numerator``
+ -
+ * - __u32
+ - ``denominator``
+ -
+.. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.7cm}|
.. _v4l2-std-id:
-.. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.7cm}|
-
.. flat-table:: typedef v4l2_std_id
:header-rows: 0
:stub-columns: 0
:widths: 1 1 2
-
- - .. row 1
-
- - __u64
-
- - ``v4l2_std_id``
-
- - This type is a set, each bit representing another video standard
- as listed below and in :ref:`video-standards`. The 32 most
- significant bits are reserved for custom (driver defined) video
- standards.
+ * - __u64
+ - ``v4l2_std_id``
+ - This type is a set, each bit representing another video standard
+ as listed below and in :ref:`video-standards`. The 32 most
+ significant bits are reserved for custom (driver defined) video
+ standards.
.. raw:: latex
- \newline\newline\begin{adjustbox}{width=\columnwidth}
+ \begin{adjustbox}{width=\columnwidth}
.. NTSC/M PAL/M /N /B /D /H /I SECAM/B /D /K1 /L
.. tabularcolumns:: |p{2.7cm}|p{2.6cm}|p{3.0cm}|p{3.2cm}|p{3.2cm}|p{2.2cm}|p{1.2cm}|p{3.2cm}|p{3.0cm}|p{2.0cm}|p{2.0cm}|p{2.0cm}|
:header-rows: 1
:stub-columns: 0
-
- - .. row 1
-
- - Characteristics
-
- - M/NTSC [#f2]_
-
- - M/PAL
-
- - N/PAL [#f3]_
-
- - B, B1, G/PAL
-
- - D, D1, K/PAL
-
- - H/PAL
-
- - I/PAL
-
- - B, G/SECAM
-
- - D, K/SECAM
-
- - K1/SECAM
-
- - L/SECAM
-
- - .. row 2
-
- - Frame lines
-
- - :cspan:`1` 525
-
- - :cspan:`8` 625
-
- - .. row 3
-
- - Frame period (s)
-
- - :cspan:`1` 1001/30000
-
- - :cspan:`8` 1/25
-
- - .. row 4
-
- - Chrominance sub-carrier frequency (Hz)
-
- - 3579545 ± 10
-
- - 3579611.49 ± 10
-
- - 4433618.75 ± 5
-
- (3582056.25 ± 5)
-
- - :cspan:`3` 4433618.75 ± 5
-
- - 4433618.75 ± 1
-
- - :cspan:`2` f\ :sub:`OR` = 4406250 ± 2000,
-
- f\ :sub:`OB` = 4250000 ± 2000
-
- - .. row 5
-
- - Nominal radio-frequency channel bandwidth (MHz)
-
- - 6
-
- - 6
-
- - 6
-
- - B: 7; B1, G: 8
-
- - 8
-
- - 8
-
- - 8
-
- - 8
-
- - 8
-
- - 8
-
- - 8
-
- - .. row 6
-
- - Sound carrier relative to vision carrier (MHz)
-
- - 4.5
-
- - 4.5
-
- - 4.5
-
- - 5.5 ± 0.001 [#f4]_ [#f5]_ [#f6]_ [#f7]_
-
- - 6.5 ± 0.001
-
- - 5.5
-
- - 5.9996 ± 0.0005
-
- - 5.5 ± 0.001
-
- - 6.5 ± 0.001
-
- - 6.5
-
- - 6.5 [#f8]_
+ * - Characteristics
+ - M/NTSC [#f2]_
+ - M/PAL
+ - N/PAL [#f3]_
+ - B, B1, G/PAL
+ - D, D1, K/PAL
+ - H/PAL
+ - I/PAL
+ - B, G/SECAM
+ - D, K/SECAM
+ - K1/SECAM
+ - L/SECAM
+ * - Frame lines
+ - :cspan:`1` 525
+ - :cspan:`8` 625
+ * - Frame period (s)
+ - :cspan:`1` 1001/30000
+ - :cspan:`8` 1/25
+ * - Chrominance sub-carrier frequency (Hz)
+ - 3579545 ± 10
+ - 3579611.49 ± 10
+ - 4433618.75 ± 5
+
+ (3582056.25 ± 5)
+ - :cspan:`3` 4433618.75 ± 5
+ - 4433618.75 ± 1
+ - :cspan:`2` f\ :sub:`OR` = 4406250 ± 2000,
+
+ f\ :sub:`OB` = 4250000 ± 2000
+ * - Nominal radio-frequency channel bandwidth (MHz)
+ - 6
+ - 6
+ - 6
+ - B: 7; B1, G: 8
+ - 8
+ - 8
+ - 8
+ - 8
+ - 8
+ - 8
+ - 8
+ * - Sound carrier relative to vision carrier (MHz)
+ - 4.5
+ - 4.5
+ - 4.5
+ - 5.5 ± 0.001 [#f4]_ [#f5]_ [#f6]_ [#f7]_
+ - 6.5 ± 0.001
+ - 5.5
+ - 5.9996 ± 0.0005
+ - 5.5 ± 0.001
+ - 6.5 ± 0.001
+ - 6.5
+ - 6.5 [#f8]_
.. raw:: latex
:ref:`Generic Error Codes <gen-errors>` chapter.
EINVAL
- The struct :ref:`v4l2_standard <v4l2-standard>` ``index`` is out
+ The struct :c:type:`v4l2_standard` ``index`` is out
of bounds.
ENODATA
projects / cascardo / linux.git / blobdiff