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121 lines
3.8 KiB
121 lines
3.8 KiB
/*****************************************************************************
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* cat.h: ISO/IEC 13818-1 Conditional Access Table (CAT)
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*****************************************************************************
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* Copyright (C) 2011 Unix Solutions Ltd.
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*
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* Authors: Georgi Chorbadzhiyski <georgi@unixsol.org>
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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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* - ISO/IEC 13818-1:2007(E) (MPEG-2 Systems)
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*/
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#ifndef __BITSTREAM_MPEG_CAT_H__
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#define __BITSTREAM_MPEG_CAT_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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* Conditional Access Table
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*****************************************************************************/
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#define CAT_PID 0x01
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#define CAT_TABLE_ID 0x01
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#define CAT_HEADER_SIZE PSI_HEADER_SIZE_SYNTAX1
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static inline void cat_init(uint8_t *p_cat)
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{
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psi_init(p_cat, true);
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psi_set_tableid(p_cat, CAT_TABLE_ID);
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p_cat[1] &= ~0x40;
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psi_set_section(p_cat, 0);
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psi_set_lastsection(p_cat, 0);
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}
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static inline void cat_set_length(uint8_t *p_cat, uint16_t i_cat_length)
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{
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psi_set_length(p_cat, CAT_HEADER_SIZE + PSI_CRC_SIZE - PSI_HEADER_SIZE
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+ i_cat_length);
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}
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static inline uint16_t cat_get_desclength(const uint8_t *p_cat)
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{
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return psi_get_length(p_cat) - (CAT_HEADER_SIZE + PSI_CRC_SIZE - PSI_HEADER_SIZE);
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}
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static inline uint8_t *cat_get_descl(uint8_t *p_cat)
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{
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return p_cat + CAT_HEADER_SIZE;
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}
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static inline const uint8_t *cat_get_descl_const(const uint8_t *p_cat)
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{
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return p_cat + CAT_HEADER_SIZE;
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}
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static inline bool cat_validate(const uint8_t *p_cat)
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{
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uint16_t i_section_size = psi_get_length(p_cat) + PSI_HEADER_SIZE
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- PSI_CRC_SIZE;
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if (!psi_get_syntax(p_cat) || psi_get_section(p_cat)
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|| psi_get_lastsection(p_cat)
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|| psi_get_tableid(p_cat) != CAT_TABLE_ID)
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return false;
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if (i_section_size < CAT_HEADER_SIZE
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|| i_section_size < CAT_HEADER_SIZE + cat_get_desclength(p_cat))
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return false;
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if (!descl_validate(cat_get_descl_const(p_cat), cat_get_desclength(p_cat)))
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return false;
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return true;
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}
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static inline bool cat_table_validate(uint8_t **pp_sections)
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{
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uint8_t i_last_section = psi_table_get_lastsection(pp_sections);
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uint8_t i;
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for (i = 0; i <= i_last_section; i++) {
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uint8_t *p_section = psi_table_get_section(pp_sections, i);
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if (!psi_check_crc(p_section))
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return false;
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}
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return true;
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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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