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262 lines
7.4 KiB
262 lines
7.4 KiB
/*****************************************************************************
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* sdt.h: ETSI EN 300 468 Service Definition Table (SDT)
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*****************************************************************************
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* Copyright (C) 2009-2020 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_SDT_H__
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#define __BITSTREAM_DVB_SDT_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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* Service Description Table
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*****************************************************************************/
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#define SDT_PID 0x11
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#define SDT_TABLE_ID_ACTUAL 0x42
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#define SDT_TABLE_ID_OTHER 0x46
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#define SDT_HEADER_SIZE (PSI_HEADER_SIZE_SYNTAX1 + 3)
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#define SDT_SERVICE_SIZE 5
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#define sdt_set_tsid psi_set_tableidext
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#define sdt_get_tsid psi_get_tableidext
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static inline void sdt_init(uint8_t *p_sdt, bool b_actual)
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{
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psi_init(p_sdt, true);
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psi_set_tableid(p_sdt, b_actual ? SDT_TABLE_ID_ACTUAL : SDT_TABLE_ID_OTHER);
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p_sdt[10] = 0xff;
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}
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static inline void sdt_set_length(uint8_t *p_sdt, uint16_t i_sdt_length)
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{
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psi_set_length(p_sdt, SDT_HEADER_SIZE + PSI_CRC_SIZE - PSI_HEADER_SIZE
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+ i_sdt_length);
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}
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static inline void sdt_set_onid(uint8_t *p_sdt, uint16_t i_onid)
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{
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p_sdt[8] = i_onid >> 8;
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p_sdt[9] = i_onid & 0xff;
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}
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static inline uint16_t sdt_get_onid(const uint8_t *p_sdt)
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{
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return (p_sdt[8] << 8) | p_sdt[9];
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}
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static inline void sdtn_init(uint8_t *p_sdt_n)
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{
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p_sdt_n[2] = 0xfc;
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p_sdt_n[3] = 0;
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}
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static inline void sdtn_set_sid(uint8_t *p_sdt_n, uint16_t i_sid)
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{
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p_sdt_n[0] = i_sid >> 8;
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p_sdt_n[1] = i_sid & 0xff;
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}
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static inline uint16_t sdtn_get_sid(const uint8_t *p_sdt_n)
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{
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return (p_sdt_n[0] << 8) | p_sdt_n[1];
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}
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static inline void sdtn_set_eitschedule(uint8_t *p_sdt_n)
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{
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p_sdt_n[2] |= 0x2;
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}
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static inline bool sdtn_get_eitschedule(const uint8_t *p_sdt_n)
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{
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return !!(p_sdt_n[2] & 0x2);
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}
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static inline void sdtn_set_eitpresent(uint8_t *p_sdt_n)
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{
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p_sdt_n[2] |= 0x1;
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}
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static inline bool sdtn_get_eitpresent(const uint8_t *p_sdt_n)
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{
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return !!(p_sdt_n[2] & 0x1);
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}
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static inline void sdtn_set_running(uint8_t *p_sdt_n, uint8_t i_running)
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{
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p_sdt_n[3] &= 0x1f;
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p_sdt_n[3] |= i_running << 5;
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}
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static inline uint8_t sdtn_get_running(const uint8_t *p_sdt_n)
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{
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return p_sdt_n[3] >> 5;
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}
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static inline void sdtn_set_ca(uint8_t *p_sdt_n)
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{
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p_sdt_n[3] |= 0x10;
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}
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static inline bool sdtn_get_ca(const uint8_t *p_sdt_n)
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{
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return !!(p_sdt_n[3] & 0x10);
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}
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static inline void sdtn_set_desclength(uint8_t *p_sdt_n, uint16_t i_length)
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{
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p_sdt_n[3] &= ~0xf;
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p_sdt_n[3] |= (i_length >> 8) & 0xf;
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p_sdt_n[4] = i_length & 0xff;
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}
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static inline uint16_t sdtn_get_desclength(const uint8_t *p_sdt_n)
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{
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return ((p_sdt_n[3] & 0xf) << 8) | p_sdt_n[4];
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}
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static inline uint8_t *sdtn_get_descs(uint8_t *p_sdt_n)
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{
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return &p_sdt_n[3];
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}
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static inline uint8_t *sdt_get_service(uint8_t *p_sdt, uint8_t n)
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{
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uint16_t i_section_size = psi_get_length(p_sdt) + PSI_HEADER_SIZE
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- PSI_CRC_SIZE;
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uint8_t *p_sdt_n = p_sdt + SDT_HEADER_SIZE;
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while (n) {
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if (p_sdt_n + SDT_SERVICE_SIZE - p_sdt > i_section_size) return NULL;
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p_sdt_n += SDT_SERVICE_SIZE + sdtn_get_desclength(p_sdt_n);
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n--;
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}
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if (p_sdt_n - p_sdt >= i_section_size) return NULL;
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return p_sdt_n;
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}
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static inline bool sdt_validate_service(const uint8_t *p_sdt,
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const uint8_t *p_sdt_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_sdt) + PSI_HEADER_SIZE
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- PSI_CRC_SIZE;
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return (p_sdt_n + SDT_SERVICE_SIZE + i_desclength
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<= p_sdt + i_section_size);
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}
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static inline bool sdt_validate(const uint8_t *p_sdt)
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{
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uint16_t i_section_size = psi_get_length(p_sdt) + PSI_HEADER_SIZE
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- PSI_CRC_SIZE;
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const uint8_t *p_sdt_n;
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if (!psi_get_syntax(p_sdt)
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|| (psi_get_tableid(p_sdt) != SDT_TABLE_ID_ACTUAL
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&& psi_get_tableid(p_sdt) != SDT_TABLE_ID_OTHER))
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return false;
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p_sdt_n = p_sdt + SDT_HEADER_SIZE;
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while (p_sdt_n + SDT_SERVICE_SIZE - p_sdt <= i_section_size
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&& p_sdt_n + SDT_SERVICE_SIZE + sdtn_get_desclength(p_sdt_n) - p_sdt
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<= i_section_size) {
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if (!descs_validate(p_sdt_n + 3))
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return false;
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p_sdt_n += SDT_SERVICE_SIZE + sdtn_get_desclength(p_sdt_n);
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}
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return (p_sdt_n - p_sdt == i_section_size);
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}
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static inline uint8_t *sdt_table_find_service(uint8_t **pp_sections,
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uint16_t i_sid)
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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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uint8_t *p_service;
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int j = 0;
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while ((p_service = sdt_get_service(p_section, j)) != NULL) {
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if (sdtn_get_sid(p_service) == i_sid)
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return p_service;
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j++;
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}
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}
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return NULL;
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}
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static inline bool sdt_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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uint16_t i_onid;
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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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uint8_t *p_service;
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int j = 0;
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if (!psi_check_crc(p_section))
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return false;
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if (!i)
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i_onid = sdt_get_onid(p_section);
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else if (sdt_get_onid(p_section) != i_onid)
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return false;
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while ((p_service = sdt_get_service(p_section, j)) != NULL) {
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j++;
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/* check that the service is not already in the table */
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if (sdt_table_find_service(pp_sections, sdtn_get_sid(p_service))
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!= p_service)
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return false;
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}
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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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