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/*
* section and descriptor parser
*
* Copyright (C) 2005 Kenneth Aafloy (kenneth@linuxtv.org)
* Copyright (C) 2005 Andrew de Quincey (adq_dvb@lidskialf.net)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifndef _UCSI_MPEG_PAT_SECTION_H
#define _UCSI_MPEG_PAT_SECTION_H 1
#ifdef __cplusplus
extern "C"
{
#endif
#include <libucsi/section.h>
/**
* mpeg_pat_section structure.
*/
struct mpeg_pat_section {
struct section_ext head; /* table_id_ext == transport_stream_id */
/* struct mpeg_pat_program programs[] */
} __ucsi_packed;
/**
* A program within an mpeg_pat_section.
*/
struct mpeg_pat_program {
uint16_t program_number;
EBIT2(uint16_t reserved : 3; ,
uint16_t pid :13; );
} __ucsi_packed;
/**
* Process an mpeg_pat_section.
*
* @param section Pointer to the generic section_ext structure.
* @return Pointer to the mpeg_pat_section structure, or NULL on error.
*/
extern struct mpeg_pat_section *mpeg_pat_section_codec(struct section_ext *section);
/**
* Accessor for the transport_stream_id field of a PAT.
*
* @param pat PAT pointer.
* @return The transport_stream_id.
*/
static inline uint16_t mpeg_pat_section_transport_stream_id(struct mpeg_pat_section *pat)
{
return pat->head.table_id_ext;
}
/**
* Conveience iterator for the programs field of an mpeg_pat_section.
*
* @param pat Pointer to the mpeg_pat_section structure.
* @param pos Variable holding a pointer to the current mpeg_pat_program structure.
*/
#define mpeg_pat_section_programs_for_each(pat, pos) \
for ((pos) = mpeg_pat_section_programs_first(pat); \
(pos); \
(pos) = mpeg_pat_section_programs_next(pat, pos))
/******************************** PRIVATE CODE ********************************/
static inline struct mpeg_pat_program *
mpeg_pat_section_programs_first(struct mpeg_pat_section * pat)
{
size_t pos = sizeof(struct mpeg_pat_section);
if (pos >= section_ext_length(&pat->head))
return NULL;
return (struct mpeg_pat_program*)((uint8_t *) pat + pos);
}
static inline
struct mpeg_pat_program *mpeg_pat_section_programs_next(struct mpeg_pat_section * pat,
struct mpeg_pat_program * pos)
{
uint8_t *end = (uint8_t*) pat + section_ext_length(&pat->head);
uint8_t *next= (uint8_t *) pos + sizeof(struct mpeg_pat_program);
if (next >= end)
return NULL;
return (struct mpeg_pat_program *) next;
}
#ifdef __cplusplus
}
#endif
#endif
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