1 /*****************************************************************************
2 * eit.h: ETSI EN 300 468 Event Information Table (EIT)
3 *****************************************************************************
4 * Copyright (C) 2009-2010 VideoLAN
5 *
6 * Authors: Christophe Massiot <massiot@via.ecp.fr>
7 * Georgi Chorbadzhiyski <georgi@unixsol.org>
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining
10 * a copy of this software and associated documentation files (the
11 * "Software"), to deal in the Software without restriction, including
12 * without limitation the rights to use, copy, modify, merge, publish,
13 * distribute, sublicense, and/or sell copies of the Software, and to
14 * permit persons to whom the Software is furnished to do so, subject
15 * to the following conditions:
16 *
17 * The above copyright notice and this permission notice shall be
18 * included in all copies or substantial portions of the Software.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
23 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
24 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
25 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
26 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27 *****************************************************************************/
28
29 /*
30 * Normative references:
31 * - ETSI EN 300 468 V1.11.1 (2010-04) (SI in DVB systems)
32 */
33
34 #ifndef __BITSTREAM_DVB_EIT_H__
35 #define __BITSTREAM_DVB_EIT_H__
36
37 #include <bitstream/common.h>
38 #include <bitstream/mpeg/psi/psi.h>
39 #include <bitstream/mpeg/psi/descriptors.h>
40
41 #ifdef __cplusplus
42 extern "C"
43 {
44 #endif
45
46 /*****************************************************************************
47 * Event Information Table
48 *****************************************************************************/
49 #define EIT_PID 0x12
50 #define EIT_TABLE_ID_PF_ACTUAL 0x4e
51 #define EIT_TABLE_ID_PF_OTHER 0x4f
52 #define EIT_TABLE_ID_SCHED_ACTUAL_FIRST 0x50
53 #define EIT_TABLE_ID_SCHED_ACTUAL_LAST 0x5f
54 #define EIT_TABLE_ID_SCHED_OTHER_FIRST 0x60
55 #define EIT_TABLE_ID_SCHED_OTHER_LAST 0x6f
56 #define EIT_HEADER_SIZE (PSI_HEADER_SIZE_SYNTAX1 + 6)
57 #define EIT_EVENT_SIZE 12
58
59 #define eit_set_sid psi_set_tableidext
60 #define eit_get_sid psi_get_tableidext
61
eit_init(uint8_t * p_eit,bool b_actual)62 static inline void eit_init(uint8_t *p_eit, bool b_actual)
63 {
64 psi_init(p_eit, true);
65 psi_set_tableid(p_eit, b_actual ? EIT_TABLE_ID_PF_ACTUAL :
66 EIT_TABLE_ID_PF_OTHER);
67 }
68
eit_set_length(uint8_t * p_eit,uint16_t i_eit_length)69 static inline void eit_set_length(uint8_t *p_eit, uint16_t i_eit_length)
70 {
71 psi_set_length(p_eit, EIT_HEADER_SIZE + PSI_CRC_SIZE - PSI_HEADER_SIZE
72 + i_eit_length);
73 }
74
eit_set_tsid(uint8_t * p_eit,uint16_t i_tsid)75 static inline void eit_set_tsid(uint8_t *p_eit, uint16_t i_tsid)
76 {
77 p_eit[8] = i_tsid >> 8;
78 p_eit[9] = i_tsid & 0xff;
79 }
80
eit_get_tsid(const uint8_t * p_eit)81 static inline uint16_t eit_get_tsid(const uint8_t *p_eit)
82 {
83 return (p_eit[8] << 8) | p_eit[9];
84 }
85
eit_set_onid(uint8_t * p_eit,uint16_t i_onid)86 static inline void eit_set_onid(uint8_t *p_eit, uint16_t i_onid)
87 {
88 p_eit[10] = i_onid >> 8;
89 p_eit[11] = i_onid & 0xff;
90 }
91
eit_get_onid(const uint8_t * p_eit)92 static inline uint16_t eit_get_onid(const uint8_t *p_eit)
93 {
94 return (p_eit[10] << 8) | p_eit[11];
95 }
96
eit_set_segment_last_sec_number(uint8_t * p_eit,uint8_t i_segment_last_sec_number)97 static inline void eit_set_segment_last_sec_number(uint8_t *p_eit, uint8_t i_segment_last_sec_number)
98 {
99 p_eit[12] = i_segment_last_sec_number;
100 }
101
eit_get_segment_last_sec_number(const uint8_t * p_eit)102 static inline uint8_t eit_get_segment_last_sec_number(const uint8_t *p_eit)
103 {
104 return p_eit[12];
105 }
106
eit_set_last_table_id(uint8_t * p_eit,uint8_t i_last_table_id)107 static inline void eit_set_last_table_id(uint8_t *p_eit, uint8_t i_last_table_id)
108 {
109 p_eit[13] = i_last_table_id;
110 }
111
eit_get_last_table_id(const uint8_t * p_eit)112 static inline uint8_t eit_get_last_table_id(const uint8_t *p_eit)
113 {
114 return p_eit[13];
115 }
116
eitn_init(uint8_t * p_eit_n)117 static inline void eitn_init(uint8_t *p_eit_n)
118 {
119 p_eit_n[10] = 0;
120 }
121
eitn_get_event_id(const uint8_t * p_eit_n)122 static inline uint16_t eitn_get_event_id(const uint8_t *p_eit_n)
123 {
124 return (p_eit_n[0] << 8) | p_eit_n[1];
125 }
126
eitn_set_event_id(uint8_t * p_eit_n,uint16_t i_event_id)127 static inline void eitn_set_event_id(uint8_t *p_eit_n, uint16_t i_event_id)
128 {
129 p_eit_n[0] = i_event_id >> 8;
130 p_eit_n[1] = i_event_id & 0xff;
131 }
132
eitn_get_start_time(const uint8_t * p_eit_n)133 static inline uint64_t eitn_get_start_time(const uint8_t *p_eit_n)
134 {
135 return (uint64_t)(((uint64_t)p_eit_n[2] << 32) | ((uint64_t)p_eit_n[3] << 24) |
136 ((uint64_t)p_eit_n[4] << 16) | ((uint64_t)p_eit_n[5] << 8) | p_eit_n[6]);
137 }
138
eitn_set_start_time(uint8_t * p_eit_n,uint64_t i_start_time)139 static inline void eitn_set_start_time(uint8_t *p_eit_n, uint64_t i_start_time)
140 {
141 p_eit_n[2] = (i_start_time >> 32) & 0xff;
142 p_eit_n[3] = (i_start_time >> 24) & 0xff;
143 p_eit_n[4] = (i_start_time >> 16) & 0xff;
144 p_eit_n[5] = (i_start_time >> 8) & 0xff;
145 p_eit_n[6] = i_start_time & 0xff;
146 }
147
eitn_get_duration_bcd(const uint8_t * p_eit_n)148 static inline uint32_t eitn_get_duration_bcd(const uint8_t *p_eit_n)
149 {
150 return ((p_eit_n[7] << 16) | (p_eit_n[8] << 8)) | p_eit_n[9];
151 }
152
eitn_set_duration_bcd(uint8_t * p_eit_n,uint32_t i_duration_bcd)153 static inline void eitn_set_duration_bcd(uint8_t *p_eit_n, uint32_t i_duration_bcd)
154 {
155 p_eit_n[7] = (i_duration_bcd >> 16) & 0xff;
156 p_eit_n[8] = (i_duration_bcd >> 8) & 0xff;
157 p_eit_n[9] = i_duration_bcd & 0xff;
158 }
159
eitn_get_running(const uint8_t * p_eit_n)160 static inline uint8_t eitn_get_running(const uint8_t *p_eit_n)
161 {
162 return p_eit_n[10] >> 5;
163 }
164
eitn_set_running(uint8_t * p_eit_n,uint8_t i_running_status)165 static inline void eitn_set_running(uint8_t *p_eit_n, uint8_t i_running_status)
166 {
167 p_eit_n[10] = (p_eit_n[10] & 0x1f) | (i_running_status << 5);
168 }
169
eitn_get_ca(const uint8_t * p_eit_n)170 static inline bool eitn_get_ca(const uint8_t *p_eit_n)
171 {
172 return (p_eit_n[10] & 0x10) == 0x10;
173 }
174
eitn_set_ca(uint8_t * p_eit_n)175 static inline void eitn_set_ca(uint8_t *p_eit_n)
176 {
177 p_eit_n[10] |= 0x10;
178 }
179
eitn_get_desclength(const uint8_t * p_eit_n)180 static inline uint16_t eitn_get_desclength(const uint8_t *p_eit_n)
181 {
182 return ((p_eit_n[10] & 0xf) << 8) | p_eit_n[11];
183 }
184
eitn_set_desclength(uint8_t * p_eit_n,uint16_t i_length)185 static inline void eitn_set_desclength(uint8_t *p_eit_n, uint16_t i_length)
186 {
187 p_eit_n[10] &= ~0xf;
188 p_eit_n[10] |= (i_length >> 8) & 0xf;
189 p_eit_n[11] = i_length & 0xff;
190 }
191
eitn_get_descs(uint8_t * p_eit_n)192 static inline uint8_t *eitn_get_descs(uint8_t *p_eit_n)
193 {
194 return &p_eit_n[10];
195 }
196
eit_get_event(uint8_t * p_eit,uint8_t n)197 static inline uint8_t *eit_get_event(uint8_t *p_eit, uint8_t n)
198 {
199 uint16_t i_section_size = psi_get_length(p_eit) + PSI_HEADER_SIZE
200 - PSI_CRC_SIZE;
201 uint8_t *p_eit_n = p_eit + EIT_HEADER_SIZE;
202 if (p_eit_n - p_eit > i_section_size) return NULL;
203
204 while (n) {
205 if (p_eit_n + EIT_EVENT_SIZE - p_eit > i_section_size) return NULL;
206 p_eit_n += EIT_EVENT_SIZE + eitn_get_desclength(p_eit_n);
207 n--;
208 }
209 if (p_eit_n - p_eit >= i_section_size) return NULL;
210
211 return p_eit_n;
212 }
213
eit_validate_event(const uint8_t * p_eit,const uint8_t * p_eit_n,uint16_t i_desclength)214 static inline bool eit_validate_event(const uint8_t *p_eit,
215 const uint8_t *p_eit_n,
216 uint16_t i_desclength)
217 {
218 uint16_t i_section_size = psi_get_length(p_eit) + PSI_HEADER_SIZE
219 - PSI_CRC_SIZE;
220 return (p_eit_n + EIT_EVENT_SIZE + i_desclength
221 <= p_eit + i_section_size);
222 }
223
eit_validate(const uint8_t * p_eit)224 static inline bool eit_validate(const uint8_t *p_eit)
225 {
226 uint16_t i_section_size = psi_get_length(p_eit) + PSI_HEADER_SIZE
227 - PSI_CRC_SIZE;
228 uint8_t i_tid = psi_get_tableid(p_eit);
229 const uint8_t *p_eit_n;
230
231 if (!psi_get_syntax(p_eit)
232 || (i_tid != EIT_TABLE_ID_PF_ACTUAL
233 && i_tid != EIT_TABLE_ID_PF_OTHER
234 && !(i_tid >= EIT_TABLE_ID_SCHED_ACTUAL_FIRST
235 && i_tid <= EIT_TABLE_ID_SCHED_ACTUAL_LAST)
236 && !(i_tid >= EIT_TABLE_ID_SCHED_OTHER_FIRST
237 && i_tid <= EIT_TABLE_ID_SCHED_OTHER_LAST)))
238 return false;
239
240 if (!psi_check_crc(p_eit))
241 return false;
242
243 p_eit_n = p_eit + EIT_HEADER_SIZE;
244
245 while (p_eit_n + EIT_EVENT_SIZE - p_eit <= i_section_size
246 && p_eit_n + EIT_EVENT_SIZE + eitn_get_desclength(p_eit_n) - p_eit
247 <= i_section_size) {
248 if (!descs_validate(p_eit_n + 10))
249 return false;
250
251 p_eit_n += EIT_EVENT_SIZE + eitn_get_desclength(p_eit_n);
252 }
253
254 return (p_eit_n - p_eit == i_section_size);
255 }
256
257 #ifdef __cplusplus
258 }
259 #endif
260
261 #endif
262