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192 lines
5.9 KiB
192 lines
5.9 KiB
/*****************************************************************************
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* sit.h: ISO/IEC 13818-1 Selection Information Table (SIT)
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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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* 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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* - ETSI EN 300 468 V1.11.1 (2010-04) (SI in DVB systems)
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*/
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#ifndef __BITSTREAM_DVB_SIT_H__
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#define __BITSTREAM_DVB_SIT_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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* Selection Information Table
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*****************************************************************************/
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#define SIT_PID 0x1f
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#define SIT_TABLE_ID 0x7f
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#define SIT_HEADER_SIZE (PSI_HEADER_SIZE_SYNTAX1 + 2)
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#define SIT_SERVICE_SIZE 4
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static inline void sit_init(uint8_t *p_sit)
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{
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psi_init(p_sit, true);
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psi_set_tableid(p_sit, SIT_TABLE_ID);
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p_sit[1] |= 0xe0;
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psi_set_tableidext(p_sit, 0xffff);
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psi_set_section(p_sit, 0);
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psi_set_lastsection(p_sit, 0);
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}
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static inline void sit_set_length(uint8_t *p_sit, uint16_t i_sit_length)
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{
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psi_set_length(p_sit, SIT_HEADER_SIZE + PSI_CRC_SIZE - PSI_HEADER_SIZE
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+ i_sit_length);
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}
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static inline uint16_t sit_get_desclength(const uint8_t *p_sit)
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{
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return ((p_sit[8] & 0x0f) << 8) | p_sit[9];
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}
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static inline void sit_set_desclength(uint8_t *p_sit, uint16_t i_length)
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{
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p_sit[8] = ((i_length >> 8) & 0xff) | 0xf0;
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p_sit[9] = i_length & 0xff;
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}
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static inline uint8_t *sit_get_descs(uint8_t *p_sit)
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{
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return &p_sit[8];
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}
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static inline void sitn_init(uint8_t *p_sit_n)
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{
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p_sit_n[2] = 0x80;
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}
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static inline uint16_t sitn_get_sid(const uint8_t *p_sit_n)
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{
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return (p_sit_n[0] << 8) | p_sit_n[1];
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}
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static inline void sitn_set_sid(uint8_t *p_sit_n, uint16_t i_sid)
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{
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p_sit_n[0] = (i_sid >> 8) & 0xff;
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p_sit_n[1] = i_sid & 0xff;
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}
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static inline uint8_t sitn_get_running_status(const uint8_t *p_sit_n)
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{
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return (p_sit_n[2] & 0x70) >> 4;
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}
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static inline void sitn_set_running_status(uint8_t *p_sit_n, uint8_t i_running_status)
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{
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p_sit_n[2] = (p_sit_n[2] &~ 0x70) | ((i_running_status & 0x07) << 4);
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}
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static inline void sitn_set_desclength(uint8_t *p_sit_n, uint16_t i_length)
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{
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p_sit_n[2] = ((i_length >> 8) & 0xff) | (p_sit_n[2] & 0xf0);
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p_sit_n[3] = i_length & 0xff;
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}
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static inline uint16_t sitn_get_desclength(const uint8_t *p_sit_n)
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{
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return ((p_sit_n[2] & 0xf) << 8) | p_sit_n[3];
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}
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static inline uint8_t *sitn_get_descs(uint8_t *p_sit_n)
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{
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return &p_sit_n[2];
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}
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static inline uint8_t *sit_get_service(uint8_t *p_sit, uint8_t n)
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{
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uint16_t i_section_size = psi_get_length(p_sit) + PSI_HEADER_SIZE
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- PSI_CRC_SIZE;
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uint8_t *p_sit_n = p_sit + SIT_HEADER_SIZE + sit_get_desclength(p_sit);
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if (p_sit_n - p_sit > i_section_size) return NULL;
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while (n) {
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if (p_sit_n + SIT_SERVICE_SIZE - p_sit > i_section_size) return NULL;
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p_sit_n += SIT_SERVICE_SIZE + sitn_get_desclength(p_sit_n);
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n--;
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}
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if (p_sit_n - p_sit >= i_section_size) return NULL;
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return p_sit_n;
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}
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static inline bool sit_validate_service(const uint8_t *p_sit, const uint8_t *p_sit_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_sit) + PSI_HEADER_SIZE
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- PSI_CRC_SIZE;
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return (p_sit_n + SIT_SERVICE_SIZE + i_desclength
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<= p_sit + i_section_size);
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}
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static inline bool sit_validate(const uint8_t *p_sit)
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{
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uint16_t i_section_size = psi_get_length(p_sit) + PSI_HEADER_SIZE
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- PSI_CRC_SIZE;
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const uint8_t *p_sit_n;
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if (!psi_get_syntax(p_sit) || psi_get_section(p_sit)
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|| psi_get_lastsection(p_sit)
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|| psi_get_tableid(p_sit) != SIT_TABLE_ID)
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return false;
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if (!psi_check_crc(p_sit))
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return false;
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if (i_section_size < SIT_HEADER_SIZE
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|| i_section_size < SIT_HEADER_SIZE + sit_get_desclength(p_sit))
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return false;
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if (!descs_validate(sit_get_descs((uint8_t *)p_sit)))
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return false;
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p_sit_n = p_sit + SIT_HEADER_SIZE + sit_get_desclength(p_sit);
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while (p_sit_n + SIT_SERVICE_SIZE - p_sit <= i_section_size
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&& p_sit_n + SIT_SERVICE_SIZE + sitn_get_desclength(p_sit_n) - p_sit
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<= i_section_size) {
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if (!descs_validate(sitn_get_descs((uint8_t *)p_sit_n)))
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return false;
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p_sit_n += SIT_SERVICE_SIZE + sitn_get_desclength(p_sit_n);
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}
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return (p_sit_n - p_sit == i_section_size);
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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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