Lines Matching +full:non +full:- +full:standard

1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
4 .. _raw-vbi:
52 ioctls as needed. The :ref:`video standard <standard>` ioctls provide
106 .. flat-table:: struct v4l2_vbi_format
107     :header-rows:  0
108     :stub-columns: 0
111     * - __u32
112       - ``sampling_rate``
113       - Samples per second, i. e. unit 1 Hz.
114     * - __u32
115       - ``offset``
116       - Horizontal offset of the VBI image, relative to the leading edge
120 	:ref:`vbi-hsync`.
121     * - __u32
122       - ``samples_per_line``
123       -
124     * - __u32
125       - ``sample_format``
126       - Defines the sample format as in :ref:`pixfmt`, a
127 	four-character-code. [#f2]_ Usually this is ``V4L2_PIX_FMT_GREY``,
134     * - __u32
135       - ``start``\ [#f2]_
136       - This is the scanning system line number associated with the first
138 	respectively. See :ref:`vbi-525` and :ref:`vbi-625` for valid
147     * - __u32
148       - ``count``\ [#f2]_
149       - The number of lines in the first and second field image,
151     * - :cspan:`2`
163 	return both count values non-zero.
170 	must first determine the current video standard selection. The
171 	:ref:`v4l2_std_id <v4l2-std-id>` or the ``framelines`` field
174     * - __u32
175       - ``flags``
176       - See :ref:`vbifmt-flags` below. Currently only drivers set flags,
178     * - __u32
179       - ``reserved``\ [#f2]_
180       - This array is reserved for future extensions. Drivers and
185 .. _vbifmt-flags:
187 .. flat-table:: Raw VBI Format Flags
188     :header-rows:  0
189     :stub-columns: 0
192     * - ``V4L2_VBI_UNSYNC``
193       - 0x0001
194       - This flag indicates hardware which does not properly distinguish
197 	or bottom field depending on the video standard. When this flag is
201     * - ``V4L2_VBI_INTERLACED``
202       - 0x0002
203       - By default the two field images will be passed sequentially; all
205 	(compare :ref:`field-order` ``V4L2_FIELD_SEQ_TB`` and
207 	memory depends on the video standard). When this flag is set, the
215 	non-zero.
218 .. _vbi-hsync:
220 .. kernel-figure:: vbi_hsync.svg
226 .. _vbi-525:
228 .. kernel-figure:: vbi_525.svg
232     **Figure 4.2. ITU-R 525 line numbering (M/NTSC and M/PAL)**
234 .. _vbi-625:
236 .. kernel-figure:: vbi_625.svg
240     **Figure 4.3. ITU-R 625 line numbering**
242 Remember the VBI image format depends on the selected video standard,
243 therefore the application must choose a new standard or query the
244 current standard first. Attempts to read or write data ahead of format
245 negotiation, or after switching the video standard which may invalidate
258 .. code-block:: c
279    ASK: Amplitude-Shift Keying. A high signal level represents a '1'
292    The valid values ar shown at :ref:`vbi-525` and :ref:`vbi-625`.