Lines Matching +full:data +full:- +full:lines
1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
7 Sliced VBI Data Interface
11 lines of an analog video signal. During VBI no picture information is
15 Sliced VBI devices use hardware to demodulate data transmitted in the
17 :ref:`raw VBI interface <raw-vbi>`. The data is passed as short
28 Different file descriptors must be used to pass raw and sliced VBI data
51 .. _sliced-vbi-format-negotitation:
56 To find out which data services are supported by the hardware
62 lines the hardware can capture or output per frame, or the number of
82 all services may be supported by the hardware on all lines (this is
103 -----------------------------
115 .. flat-table::
116 :header-rows: 0
117 :stub-columns: 0
120 * - __u16
121 - ``service_set``
122 - :cspan:`2`
124 If ``service_set`` is non-zero when passed with
130 a driver for the cx25840 video decoder sets lines 7-22 of both
140 * - __u16
141 - ``service_lines``\ [2][24]
142 - :cspan:`2`
144 Applications initialize this array with sets of data services the
152 Data services are defined in :ref:`vbi-services2`. Array indices
153 map to ITU-R line numbers\ [#f2]_ as follows:
154 * -
155 -
156 - Element
157 - 525 line systems
158 - 625 line systems
159 * -
160 -
161 - ``service_lines``\ [0][1]
162 - 1
163 - 1
164 * -
165 -
166 - ``service_lines``\ [0][23]
167 - 23
168 - 23
169 * -
170 -
171 - ``service_lines``\ [1][1]
172 - 264
173 - 314
174 * -
175 -
176 - ``service_lines``\ [1][23]
177 - 286
178 - 336
179 * -
180 -
181 - :cspan:`2` Drivers must set ``service_lines`` [0][0] and
188 * - __u32
189 - ``io_size``
190 - :cspan:`2` Maximum number of bytes passed by one
197 number of non-zero elements in the returned ``service_lines``
198 array (that is the number of lines potentially carrying data).
199 * - __u32
200 - ``reserved``\ [2]
201 - :cspan:`2` This array is reserved for future extensions.
209 .. _vbi-services2:
212 -------------------
220 .. flat-table::
221 :header-rows: 1
222 :stub-columns: 0
225 * - Symbol
226 - Value
227 - Reference
228 - Lines, usually
229 - Payload
230 * - ``V4L2_SLICED_TELETEXT_B`` (Teletext System B)
231 - 0x0001
232 - :ref:`ets300706`,
235 - PAL/SECAM line 7-22, 320-335 (second field 7-22)
236 - Last 42 of the 45 byte Teletext packet, that is without clock
237 run-in and framing code, lsb first transmitted.
238 * - ``V4L2_SLICED_VPS``
239 - 0x0400
240 - :ref:`ets300231`
241 - PAL line 16
242 - Byte number 3 to 15 according to Figure 9 of ETS 300 231, lsb
244 * - ``V4L2_SLICED_CAPTION_525``
245 - 0x1000
246 - :ref:`cea608`
247 - NTSC line 21, 284 (second field 21)
248 - Two bytes in transmission order, including parity bit, lsb first
250 * - ``V4L2_SLICED_WSS_625``
251 - 0x4000
252 - :ref:`itu1119`,
255 - PAL/SECAM line 23
256 -
263 * - ``V4L2_SLICED_VBI_525``
264 - 0x1000
265 - :cspan:`2` Set of services applicable to 525 line systems.
266 * - ``V4L2_SLICED_VBI_625``
267 - 0x4401
268 - :cspan:`2` Set of services applicable to 625 line systems.
275 read or write data without prior format negotiation, after switching the
285 Reading and writing sliced VBI data
289 call must pass all data belonging to one video frame. That is an array
292 in streaming I/O mode one buffer of ``io_size`` bytes must contain data
299 ---------------------------
303 .. flat-table::
304 :header-rows: 0
305 :stub-columns: 0
308 * - __u32
309 - ``id``
310 - A flag from :ref:`vbi-services` identifying the type of data in
315 contents of the ``data`` field are undefined and the driver must
316 no longer insert data on the requested ``field`` and ``line``.
317 * - __u32
318 - ``field``
319 - The video field number this data has been captured from, or shall
322 * - __u32
323 - ``line``
324 - The field (as opposed to frame) line number this data has been
325 captured from, or shall be inserted at. See :ref:`vbi-525` and
326 :ref:`vbi-625` for valid values. Sliced VBI capture devices can
328 reliably identify scan lines. The field number must always be
330 * - __u32
331 - ``reserved``
332 - This field is reserved for future extensions. Applications and
334 * - __u8
335 - ``data``\ [48]
336 - The packet payload. See :ref:`vbi-services` for the contents and
337 number of bytes passed for each data type. The contents of padding
354 captured frame does not carry any of the requested data services drivers
356 VBI data in time for output, the driver must output the last VPS and WSS
358 data, or output data which is ignored by Closed Caption and Teletext
364 synchronizing video and VBI data by using buffer timestamps.
366 Sliced VBI Data in MPEG Streams
371 :ref:`negotiated sliced VBI services <sliced-vbi-format-negotitation>`
372 as data embedded in the MPEG stream. Users or applications control this
373 sliced VBI data insertion with the
374 :ref:`V4L2_CID_MPEG_STREAM_VBI_FMT <v4l2-mpeg-stream-vbi-fmt>`
378 :ref:`V4L2_CID_MPEG_STREAM_VBI_FMT <v4l2-mpeg-stream-vbi-fmt>`
380 :ref:`V4L2_MPEG_STREAM_VBI_FMT_NONE <v4l2-mpeg-stream-vbi-fmt>`,
381 then the device cannot embed sliced VBI data in the MPEG stream.
384 :ref:`V4L2_CID_MPEG_STREAM_VBI_FMT <v4l2-mpeg-stream-vbi-fmt>`
386 capturing sliced VBI data. The control only indicates to embed sliced
387 VBI data in the MPEG stream, if an application has negotiated sliced VBI
390 It may also be the case that a device can embed sliced VBI data in only
391 certain types of MPEG streams: for example in an MPEG-2 PS but not an
392 MPEG-2 TS. In this situation, if sliced VBI data insertion is requested,
393 the sliced VBI data will be embedded in MPEG stream types when
395 data insertion is not supported by the device.
398 data.
400 MPEG Stream Embedded, Sliced VBI Data Format: NONE
401 --------------------------------------------------
404 :ref:`V4L2_MPEG_STREAM_VBI_FMT_NONE <v4l2-mpeg-stream-vbi-fmt>`
406 to cease embedding sliced VBI data in MPEG streams. Neither the device
407 nor driver shall insert "empty" embedded sliced VBI data packets in the
408 MPEG stream when this format is set. No MPEG stream data structures are
411 MPEG Stream Embedded, Sliced VBI Data Format: IVTV
412 --------------------------------------------------
415 :ref:`V4L2_MPEG_STREAM_VBI_FMT_IVTV <v4l2-mpeg-stream-vbi-fmt>`
417 embed up to 36 lines of sliced VBI data per frame in an MPEG-2 *Private
418 Stream 1 PES* packet encapsulated in an MPEG-2 *Program Pack* in the
422 custom, embedded, sliced VBI data format used by the ``ivtv`` driver.
424 in the file ``Documentation/userspace-api/media/drivers/cx2341x-uapi.rst`` . The
427 to extracting, decoding, and displaying sliced VBI data embedded within
431 exclusive to CX2341x devices, as the sliced VBI data packet insertion
433 ``cx18`` driver provides sliced VBI data insertion into an MPEG-2 PS in
436 The following definitions specify the payload of the MPEG-2 *Private
437 Stream 1 PES* packets that contain sliced VBI data when
438 :ref:`V4L2_MPEG_STREAM_VBI_FMT_IVTV <v4l2-mpeg-stream-vbi-fmt>`
439 is set. (The MPEG-2 *Private Stream 1 PES* packet header and
440 encapsulating MPEG-2 *Program Pack* header are not detailed here. Please
441 refer to the MPEG-2 specifications for details on those packet headers.)
443 The payload of the MPEG-2 *Private Stream 1 PES* packets that contain
444 sliced VBI data is specified by struct
446 payload is variable length, depending on the actual number of lines of
447 sliced VBI data present in a video frame. The payload may be padded at
449 4-byte boundary. The payload shall never exceed 1552 bytes (2 fields
450 with 18 lines/field with 43 bytes of data/line and a 4 byte magic
456 -----------------------------
460 .. flat-table::
461 :header-rows: 0
462 :stub-columns: 0
465 * - __u8
466 - ``magic``\ [4]
467 - A "magic" constant from :ref:`v4l2-mpeg-vbi-fmt-ivtv-magic` that
468 indicates this is a valid sliced VBI data payload and also
470 ``ITV0``, to use for the payload data.
471 * - union {
472 - (anonymous)
473 * - struct :c:type:`v4l2_mpeg_vbi_itv0`
474 - ``itv0``
475 - The primary form of the sliced VBI data payload that contains
476 anywhere from 1 to 35 lines of sliced VBI data. Line masks are
477 provided in this form of the payload indicating which VBI lines
479 * - struct :ref:`v4l2_mpeg_vbi_ITV0 <v4l2-mpeg-vbi-itv0-1>`
480 - ``ITV0``
481 - An alternate form of the sliced VBI data payload used when 36
482 lines of sliced VBI data are present. No line masks are provided
485 * - }
486 -
488 .. _v4l2-mpeg-vbi-fmt-ivtv-magic:
491 -------------------------------------------------------------
495 .. flat-table::
496 :header-rows: 1
497 :stub-columns: 0
500 * - Defined Symbol
501 - Value
502 - Description
503 * - ``V4L2_MPEG_VBI_IVTV_MAGIC0``
504 - "itv0"
505 - Indicates the ``itv0`` member of the union in struct
508 * - ``V4L2_MPEG_VBI_IVTV_MAGIC1``
509 - "ITV0"
510 - Indicates the ``ITV0`` member of the union in struct
512 valid and that 36 lines of sliced VBI data are present.
520 -------------------------------------------------
524 .. flat-table::
525 :header-rows: 0
526 :stub-columns: 0
529 * - __le32
530 - ``linemask``\ [2]
531 - Bitmasks indicating the VBI service lines present. These
547 linemask[1] b4-b31: unused and set to 0
548 * - struct
550 - ``line``\ [35]
551 - This is a variable length array that holds from 1 to 35 lines of
552 sliced VBI data. The sliced VBI data lines present correspond to
560 one line of unspecified data that should be ignored by
564 .. _v4l2-mpeg-vbi-itv0-1:
567 -------------------------
571 .. flat-table::
572 :header-rows: 0
573 :stub-columns: 0
576 * - struct
578 - ``line``\ [36]
579 - A fixed length array of 36 lines of sliced VBI data. ``line``\ [0]
580 through ``line``\ [17] correspond to lines 6 through 23 of the
582 lines 6 through 23 of the second field.
588 ------------------------------
592 .. flat-table::
593 :header-rows: 0
594 :stub-columns: 0
597 * - __u8
598 - ``id``
599 - A line identifier value from
600 :ref:`ITV0-Line-Identifier-Constants` that indicates the type of
601 sliced VBI data stored on this line.
602 * - __u8
603 - ``data``\ [42]
604 - The sliced VBI data for the line.
607 .. _ITV0-Line-Identifier-Constants:
610 ------------------------------------------------------------
614 .. flat-table::
615 :header-rows: 1
616 :stub-columns: 0
619 * - Defined Symbol
620 - Value
621 - Description
622 * - ``V4L2_MPEG_VBI_IVTV_TELETEXT_B``
623 - 1
624 - Refer to :ref:`Sliced VBI services <vbi-services2>` for a
626 * - ``V4L2_MPEG_VBI_IVTV_CAPTION_525``
627 - 4
628 - Refer to :ref:`Sliced VBI services <vbi-services2>` for a
630 * - ``V4L2_MPEG_VBI_IVTV_WSS_625``
631 - 5
632 - Refer to :ref:`Sliced VBI services <vbi-services2>` for a
634 * - ``V4L2_MPEG_VBI_IVTV_VPS``
635 - 7
636 - Refer to :ref:`Sliced VBI services <vbi-services2>` for a
641 According to :ref:`ETS 300 706 <ets300706>` lines 6-22 of the first
642 field and lines 5-22 of the second field may carry Teletext data.
645 See also :ref:`vbi-525` and :ref:`vbi-625`.