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1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
16 transmissions of services such as Teletext or Closed Caption.
19 signal, or to be added to a signal for output. The data format is
31 ``/dev/video``. To capture or output raw VBI data with these devices
33 Accessed as ``/dev/vbi``, raw VBI capturing or output is the default
39 Devices supporting the raw VBI capturing or output API set the
40 ``V4L2_CAP_VBI_CAPTURE`` or ``V4L2_CAP_VBI_OUTPUT`` flags, respectively,
44 read/write or streaming I/O methods must be supported. VBI
45 devices may or may not have a tuner or modulator.
50 VBI devices shall support :ref:`video input or output <video>`,
51 :ref:`tuner or modulator <tuner>`, and :ref:`controls <control>`
71 ``V4L2_BUF_TYPE_VBI_CAPTURE`` or ``V4L2_BUF_TYPE_VBI_OUTPUT``, and call
80 ``vbi`` member of the ``fmt`` union, or better just modify the results
89 overlap, or when the driver supports multiple opens and another process
90 already requested VBI capturing or output. Anyway, applications must
131 	necessarily indicate if the signal is 'high' or 'low' because 128
142 	for each field for each 525 or 625 line format as a convenience.
154 	be possible to extend or move the VBI capture window down to the
158 	An application can set the first or second ``count`` value to zero
165 	Both ``count`` values set to zero, or line numbers are outside the
166 	bounds depicted\ [#f4]_, or a field image covering lines of two
171 	:ref:`v4l2_std_id <v4l2-std-id>` or the ``framelines`` field
197 	or bottom field depending on the video standard. When this flag is
198 	set the first or second field may be stored first, however the
206 	``V4L2_FIELD_SEQ_BT``, whether the top or bottom field is first in
212 	or output interlaced video images and is unable to separate the
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
266 A VBI device may support :ref:`read/write <rw>` and/or streaming
267 (:ref:`memory mapping <mmap>` or :ref:`user pointer <userp>`) I/O.
289    decoded or encoded when ``V4L2_VBI_UNSYNC`` is set.