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369 lines
10 KiB
C
369 lines
10 KiB
C
/*
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* libzvbi -- Sliced VBI data
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*
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* Copyright (C) 2000, 2001 Michael H. Schimek
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA.
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*/
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/* $Id: sliced.h,v 1.11 2008-02-24 14:17:02 mschimek Exp $ */
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#ifndef SLICED_H
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#define SLICED_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Public */
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#include <inttypes.h>
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/**
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* @addtogroup Sliced Sliced VBI data
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* @ingroup Raw
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* @brief Definition of sliced VBI data.
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*
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* The output of the libzvbi raw VBI decoder, and input to the data
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* service decoder, is VBI data in binary format as defined in this
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* section. It is similar to the output of hardware VBI decoders
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* and VBI data transmitted in digital TV streams.
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*/
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/**
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* @name Data service symbols
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* @ingroup Sliced
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* @{
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*/
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/**
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* @anchor VBI_SLICED_
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* No data service, blank vbi_sliced structure.
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*/
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#define VBI_SLICED_NONE 0
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/**
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* Unknown data service (vbi_dvb_demux).
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* @since 0.2.10
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*/
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#define VBI_SLICED_UNKNOWN 0
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/**
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* Antiope a.k.a. Teletext System A
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*
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* Reference: <a href="http://www.itu.ch">ITU-R BT.653
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* "Teletext Systems"</a>
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*
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* vbi_sliced payload: Last 37 bytes, without clock run-in and
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* framing code, lsb first transmitted.
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*
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* @since 0.2.10
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*/
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#define VBI_SLICED_ANTIOPE 0x00002000
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/**
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* Synonym of VBI_SLICED_ANTIOPE.
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* @since 0.2.10
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*/
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#define VBI_SLICED_TELETEXT_A 0x00002000
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#define VBI_SLICED_TELETEXT_B_L10_625 0x00000001
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#define VBI_SLICED_TELETEXT_B_L25_625 0x00000002
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/**
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* Teletext System B for 625 line systems
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*
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* Note this is separated into Level 1.0 and Level 2.5+ since the latter
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* permits occupation of scan line 6 which is frequently out of
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* range of raw VBI capture drivers. Clients should request decoding of both,
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* may then verify Level 2.5 is covered. vbi_sliced id can be
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* VBI_SLICED_TELETEXT_B, _B_L10_625 or _B_L25_625 regardless of line number.
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*
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* Reference: <a href="http://www.etsi.org">EN 300 706
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* "Enhanced Teletext specification"</a>, <a href="http://www.itu.ch">
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* ITU-R BT.653 "Teletext Systems"</a>
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*
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* vbi_sliced payload: Last 42 of the 45 byte Teletext packet, that is
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* without clock run-in and framing code, lsb first transmitted.
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*/
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#define VBI_SLICED_TELETEXT_B (VBI_SLICED_TELETEXT_B_L10_625 | \
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VBI_SLICED_TELETEXT_B_L25_625)
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/**
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* Synonym of VBI_SLICED_TELETEXT_B.
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* @since 0.2.10
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*/
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#define VBI_SLICED_TELETEXT_B_625 VBI_SLICED_TELETEXT_B
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/**
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* Teletext System C for 625 line systems
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*
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* Reference: <a href="http://www.itu.ch">ITU-R BT.653
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* "Teletext Systems"</a>
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*
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* vbi_sliced payload: Last 33 bytes, without clock run-in and
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* framing code, lsb first transmitted.
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*
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* @since 0.2.10
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*/
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#define VBI_SLICED_TELETEXT_C_625 0x00004000
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/**
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* Teletext System D for 625 line systems
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*
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* Reference: <a href="http://www.itu.ch">ITU-R BT.653
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* "Teletext Systems"</a>
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*
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* vbi_sliced payload: Last 34 bytes, without clock run-in and
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* framing code, lsb first transmitted.
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*
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* @since 0.2.10
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*/
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#define VBI_SLICED_TELETEXT_D_625 0x00008000
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/**
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* Video Program System
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*
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* Reference: <a href="http://www.etsi.org">ETS 300 231
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* "Specification of the domestic video Programme
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* Delivery Control system (PDC)"</a>, <a href="http://www.irt.de">
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* IRT 8R2 "Video-Programm-System (VPS)"</a>.
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*
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* vbi_sliced payload: Byte number 3 to 15 according to ETS 300 231
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* Figure 9, lsb first transmitted.
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*/
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#define VBI_SLICED_VPS 0x00000004
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/**
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* Pseudo-VPS signal transmitted on field 2
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*
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* vbi_sliced payload: 13 bytes.
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*
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* @since 0.2.10
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*/
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#define VBI_SLICED_VPS_F2 0x00001000
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#define VBI_SLICED_CAPTION_625_F1 0x00000008
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#define VBI_SLICED_CAPTION_625_F2 0x00000010
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/**
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* Closed Caption for 625 line systems
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*
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* Note this is split into field one and two services since for basic
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* caption decoding only field one is required. vbi_sliced id can be
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* VBI_SLICED_CAPTION_625, _625_F1 or _625_F2 regardless of line number.
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*
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* Reference: <a href="http://global.ihs.com">EIA 608
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* "Recommended Practice for Line 21 Data Service"</a>.
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*
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* vbi_sliced payload: First and second byte including parity,
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* lsb first transmitted.
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*/
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#define VBI_SLICED_CAPTION_625 (VBI_SLICED_CAPTION_625_F1 | \
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VBI_SLICED_CAPTION_625_F2)
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/**
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* Wide Screen Signalling for 625 line systems
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*
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* Reference: <a href="http://www.etsi.org">EN 300 294
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* "625-line television Wide Screen Signalling (WSS)"</a>.
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*
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* vbi_sliced payload:
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* ```
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* Byte 0 1
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* msb lsb msb lsb
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* bit 7 6 5 4 3 2 1 0 x x 13 12 11 10 9 8
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* ```
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* according to EN 300 294, Table 1, lsb first transmitted.
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*/
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#define VBI_SLICED_WSS_625 0x00000400
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#define VBI_SLICED_CAPTION_525_F1 0x00000020
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#define VBI_SLICED_CAPTION_525_F2 0x00000040
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/**
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* Closed Caption for 525 line systems (NTSC).
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*
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* Note this is split into field one and two services since for basic
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* caption decoding only field one is required. vbi_sliced id can be
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* VBI_SLICED_CAPTION_525, _525_F1 or _525_F2 regardless of line number.
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*
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* VBI_SLICED_CAPTION_525 also covers XDS (Extended Data Service),
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* V-Chip data and ITV / WebTV data.
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*
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* Reference: <a href="http://global.ihs.com">EIA 608
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* "Recommended Practice for Line 21 Data Service"</a>.
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*
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* vbi_sliced payload: First and second byte including parity,
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* lsb first transmitted.
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*/
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#define VBI_SLICED_CAPTION_525 (VBI_SLICED_CAPTION_525_F1 | \
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VBI_SLICED_CAPTION_525_F2)
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/**
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* Closed Caption at double bit rate for 525 line systems.
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*
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* Reference: ?
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*
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* vbi_sliced payload: First to fourth byte including parity bit,
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* lsb first transmitted.
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*/
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#define VBI_SLICED_2xCAPTION_525 0x00000080
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/**
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* Teletext System B for 525 line systems
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*
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* Reference: <a href="http://www.itu.ch">ITU-R BT.653
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* "Teletext Systems"</a>
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*
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* vbi_sliced payload: Last 34 bytes, without clock run-in and
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* framing code, lsb first transmitted.
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*
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* @since 0.2.10
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*/
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#define VBI_SLICED_TELETEXT_B_525 0x00010000
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/**
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* North American Basic Teletext Specification
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* a.k.a. Teletext System C for 525 line systems
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*
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* Reference: <a href="http://global.ihs.com">EIA-516
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* "North American Basic Teletext Specification (NABTS)"</a>,
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* <a href="http://www.itu.ch">ITU-R BT.653 "Teletext Systems"</a>
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*
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* vbi_sliced payload: Last 33 bytes, without clock run-in and
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* framing code, lsb first transmitted.
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*
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* @since 0.2.10
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*/
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#define VBI_SLICED_NABTS 0x00000100
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/**
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* Synonym of VBI_SLICED_NABTS.
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* @since 0.2.10
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*/
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#define VBI_SLICED_TELETEXT_C_525 0x00000100
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/**
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* Misdefined.
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*
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* vbi_sliced payload: 34 bytes.
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*
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* @deprecated
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* This service was misdefined.
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* Use VBI_SLICED_TELETEXT_B_525 or VBI_SLICED_TELETEXT_D_525 in new code.
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*/
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#define VBI_SLICED_TELETEXT_BD_525 0x00000200
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/**
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* Teletext System D for 525 line systems
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*
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* Reference: <a href="http://www.itu.ch">ITU-R BT.653
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* "Teletext Systems"</a>
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*
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* vbi_sliced payload: Last 34 bytes, without clock run-in and
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* framing code, lsb first transmitted.
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*
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* @since 0.2.10
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*/
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#define VBI_SLICED_TELETEXT_D_525 0x00020000
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/**
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* Wide Screen Signalling for NTSC Japan
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*
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* Reference: <a href="http://www.jeita.or.jp">EIA-J CPR-1204</a>
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*
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* vbi_sliced payload:
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* ```
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* Byte 0 1 2
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* msb lsb msb lsb msb lsb
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* bit 7 6 5 4 3 2 1 0 15 14 13 12 11 10 9 8 x x x x 19 18 17 16
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* ```
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*/
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#define VBI_SLICED_WSS_CPR1204 0x00000800
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/**
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* No actual data service. This symbol is used to request capturing
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* of all PAL/SECAM VBI data lines from the libzvbi driver interface,
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* as opposed to just those lines used to transmit the requested
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* data services.
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*/
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#define VBI_SLICED_VBI_625 0x20000000
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/**
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* No actual data service. This symbol is used to request capturing
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* of all NTSC VBI data lines from the libzvbi driver interface,
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* as opposed to just those lines used to transmit the requested
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* data services.
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*/
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#define VBI_SLICED_VBI_525 0x40000000
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/** @} */
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typedef unsigned int vbi_service_set;
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/**
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* @ingroup Sliced
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* @brief This structure holds one scan line of sliced vbi data.
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*
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* For example the contents of NTSC line 21, two bytes of Closed Caption
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* data. Usually an array of vbi_sliced is used, covering all
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* VBI lines of the two fields of a video frame.
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*/
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typedef struct {
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/**
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* A @ref VBI_SLICED_ symbol identifying the data service. Under circumstances
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* (see VBI_SLICED_TELETEXT_B) this can be a set of VBI_SLICED_ symbols.
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*/
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uint32_t id;
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/**
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* Source line number according to the ITU-R line numbering scheme,
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* a value of @c 0 if the exact line number is unknown. Note that some
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* data services cannot be reliable decoded without line number.
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*
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* @image html zvbi_625.gif "ITU-R PAL/SECAM line numbering scheme"
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* @image html zvbi_525.gif "ITU-R NTSC line numbering scheme"
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*/
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uint32_t line;
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/**
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* The actual payload. See the documentation of @ref VBI_SLICED_ symbols
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* for details.
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*/
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uint8_t data[56];
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} vbi_sliced;
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/**
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* @addtogroup Sliced
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* @{
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*/
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extern const char *
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vbi_sliced_name (vbi_service_set service)
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_vbi_const;
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extern unsigned int
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vbi_sliced_payload_bits (vbi_service_set service)
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_vbi_const;
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/** @} */
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/* Private */
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#ifdef __cplusplus
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}
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#endif
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#endif /* SLICED_H */
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/*
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Local variables:
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c-set-style: K&R
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c-basic-offset: 8
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End:
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*/
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