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117 lines
3.0 KiB
117 lines
3.0 KiB
/*
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* section and descriptor parser
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*
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* Copyright (C) 2005 Kenneth Aafloy (kenneth@linuxtv.org)
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* Copyright (C) 2005 Andrew de Quincey (adq_dvb@lidskialf.net)
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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 Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#ifndef _UCSI_DVB_VBI_TELETEXT_DESCRIPTOR
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#define _UCSI_DVB_VBI_TELETEXT_DESCRIPTOR 1
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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#include <libucsi/descriptor.h>
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#include <libucsi/endianops.h>
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#include <libucsi/types.h>
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/**
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* dvb_vbi_teletext_descriptor structure
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*/
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struct dvb_vbi_teletext_descriptor {
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struct descriptor d;
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/* struct dvb_vbi_teletext_entry entries[] */
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} __ucsi_packed;
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/**
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* An entry in a dvb_vbi_teletext_descriptor structure.
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*/
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struct dvb_vbi_teletext_entry {
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iso639lang_t language_code;
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EBIT2(uint8_t type : 5; ,
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uint8_t magazine_number: 3; );
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uint8_t page_number;
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} __ucsi_packed;
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/**
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* Process an dvb_vbi_teletext_descriptor.
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*
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* @param d Generic descriptor.
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* @return dvb_vbi_teletext_descriptor pointer, or NULL on error.
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*/
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static inline struct dvb_vbi_teletext_descriptor*
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dvb_vbi_teletext_descriptor_codec(struct descriptor* d)
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{
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if (d->len % sizeof(struct dvb_vbi_teletext_entry))
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return NULL;
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return (struct dvb_vbi_teletext_descriptor*) d;
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}
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/**
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* Iterator for entries field of a dvb_vbi_teletext_descriptor.
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*
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* @param d Pointer to dvb_vbi_teletext_descriptor.
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* @param pos Variable holding a pointer to the current dvb_vbi_teletext_entry.
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*/
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#define dvb_vbi_teletext_descriptor_entries_for_each(d, pos) \
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for ((pos) = dvb_vbi_teletext_descriptor_entries_first(d); \
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(pos); \
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(pos) = dvb_vbi_teletext_descriptor_entries_next(d, pos))
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/******************************** PRIVATE CODE ********************************/
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static inline struct dvb_vbi_teletext_entry*
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dvb_vbi_teletext_descriptor_entries_first(struct dvb_vbi_teletext_descriptor *d)
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{
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if (d->d.len == 0)
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return NULL;
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return (struct dvb_vbi_teletext_entry *)
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((uint8_t*) d + sizeof(struct dvb_vbi_teletext_descriptor));
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}
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static inline struct dvb_vbi_teletext_entry*
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dvb_vbi_teletext_descriptor_entries_next(struct dvb_vbi_teletext_descriptor *d,
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struct dvb_vbi_teletext_entry *pos)
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{
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uint8_t *end = (uint8_t*) d + 2 + d->d.len;
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uint8_t *next = (uint8_t *) pos + sizeof(struct dvb_vbi_teletext_entry);
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if (next >= end)
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return NULL;
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return (struct dvb_vbi_teletext_entry *) next;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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