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139 lines
4.7 KiB
139 lines
4.7 KiB
/*****************************************************************************
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* eit.h: ETSI EN 300 468 Event Information Table (EIT)
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*****************************************************************************
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* Copyright (C) 2009-2010 VideoLAN
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*
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* Authors: Christophe Massiot <massiot@via.ecp.fr>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject
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* to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*****************************************************************************/
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/*
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* Normative references:
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* - ETSI EN 300 468 V1.11.1 (2010-04) (SI in DVB systems)
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*/
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#ifndef __BITSTREAM_DVB_EIT_H__
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#define __BITSTREAM_DVB_EIT_H__
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#include <bitstream/common.h>
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#include <bitstream/mpeg/psi/psi.h>
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#include <bitstream/mpeg/psi/descriptors.h>
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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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/*****************************************************************************
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* Event Information Table
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*****************************************************************************/
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#define EIT_PID 0x12
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#define EIT_TABLE_ID_PF_ACTUAL 0x4e
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#define EIT_TABLE_ID_PF_OTHER 0x4f
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#define EIT_TABLE_ID_SCHED_ACTUAL_FIRST 0x50
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#define EIT_TABLE_ID_SCHED_ACTUAL_LAST 0x5f
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#define EIT_TABLE_ID_SCHED_OTHER_FIRST 0x60
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#define EIT_TABLE_ID_SCHED_OTHER_LAST 0x6f
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#define EIT_HEADER_SIZE (PSI_HEADER_SIZE_SYNTAX1 + 6)
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#define EIT_EVENT_SIZE 12
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#define eit_set_sid psi_set_tableidext
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#define eit_get_sid psi_get_tableidext
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static inline void eit_init(uint8_t *p_eit, bool b_actual)
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{
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psi_init(p_eit, true);
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psi_set_tableid(p_eit, b_actual ? EIT_TABLE_ID_PF_ACTUAL :
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EIT_TABLE_ID_PF_OTHER);
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}
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static inline void eit_set_length(uint8_t *p_eit, uint16_t i_eit_length)
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{
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psi_set_length(p_eit, EIT_HEADER_SIZE + PSI_CRC_SIZE - PSI_HEADER_SIZE
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+ i_eit_length);
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}
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static inline void eit_set_tsid(uint8_t *p_eit, uint16_t i_tsid)
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{
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p_eit[8] = i_tsid >> 8;
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p_eit[9] = i_tsid & 0xff;
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}
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static inline uint16_t eit_get_tsid(const uint8_t *p_eit)
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{
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return (p_eit[8] << 8) | p_eit[9];
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}
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static inline uint16_t eitn_get_desclength(const uint8_t *p_eit_n)
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{
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return ((p_eit_n[10] & 0xf) << 8) | p_eit_n[11];
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}
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static inline bool eit_validate_event(const uint8_t *p_eit,
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const uint8_t *p_eit_n,
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uint16_t i_desclength)
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{
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uint16_t i_section_size = psi_get_length(p_eit) + PSI_HEADER_SIZE
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- PSI_CRC_SIZE;
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return (p_eit_n + EIT_EVENT_SIZE + i_desclength
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<= p_eit + i_section_size);
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}
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static inline bool eit_validate(const uint8_t *p_eit)
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{
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uint16_t i_section_size = psi_get_length(p_eit) + PSI_HEADER_SIZE
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- PSI_CRC_SIZE;
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uint8_t i_tid = psi_get_tableid(p_eit);
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const uint8_t *p_eit_n;
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if (!psi_get_syntax(p_eit)
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|| (i_tid != EIT_TABLE_ID_PF_ACTUAL
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&& i_tid != EIT_TABLE_ID_PF_OTHER
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&& !(i_tid >= EIT_TABLE_ID_SCHED_ACTUAL_FIRST
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&& i_tid <= EIT_TABLE_ID_SCHED_ACTUAL_LAST)
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&& !(i_tid >= EIT_TABLE_ID_SCHED_OTHER_FIRST
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&& i_tid <= EIT_TABLE_ID_SCHED_OTHER_LAST)))
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return false;
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if (!psi_check_crc(p_eit))
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return false;
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p_eit_n = p_eit + EIT_HEADER_SIZE;
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while (p_eit_n + EIT_EVENT_SIZE - p_eit <= i_section_size
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&& p_eit_n + EIT_EVENT_SIZE + eitn_get_desclength(p_eit_n) - p_eit
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<= i_section_size) {
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if (!descs_validate(p_eit_n + 10))
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return false;
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p_eit_n += EIT_EVENT_SIZE + eitn_get_desclength(p_eit_n);
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}
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return (p_eit_n - p_eit == i_section_size);
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}
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/* TODO: unfinished support */
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#ifdef __cplusplus
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}
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#endif
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#endif
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