1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
/*
* section and descriptor parser
*
* Copyright (C) 2005 Kenneth Aafloy (kenneth@linuxtv.org)
* Copyright (C) 2005 Andrew de Quincey (adq_dvb@lidskialf.net)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifndef _UCSI_DVB_EXTENDED_EVENT_DESCRIPTOR
#define _UCSI_DVB_EXTENDED_EVENT_DESCRIPTOR 1
#ifdef __cplusplus
extern "C"
{
#endif
#include <libucsi/descriptor.h>
#include <libucsi/endianops.h>
#include <libucsi/types.h>
/**
* dvb_extended_event_descriptor structure.
*/
struct dvb_extended_event_descriptor {
struct descriptor d;
EBIT2(uint8_t descriptor_number : 4; ,
uint8_t last_descriptor_number : 4; );
iso639lang_t language_code;
uint8_t length_of_items;
/* struct dvb_extended_event_item items[] */
/* struct dvb_extended_event_descriptor_part2 part2 */
} __ucsi_packed;
/**
* An entry in the items field of a dvb_extended_event_descriptor.
*/
struct dvb_extended_event_item {
uint8_t item_description_length;
/* uint8_t item_description[] */
/* struct dvb_extended_event_item_part2 part2 */
} __ucsi_packed;
/**
* The second part of a dvb_extended_event_item, following the variable length
* description field.
*/
struct dvb_extended_event_item_part2 {
uint8_t item_length;
/* uint8_t item[] */
} __ucsi_packed;
/**
* The second part of a dvb_extended_event_descriptor, following the variable
* length items field.
*/
struct dvb_extended_event_descriptor_part2 {
uint8_t text_length;
/* uint8_t text[] */
} __ucsi_packed;
/**
* Process a dvb_extended_event_descriptor.
*
* @param d Generic descriptor structure.
* @return dvb_extended_event_descriptor pointer, or NULL on error.
*/
static inline struct dvb_extended_event_descriptor*
dvb_extended_event_descriptor_codec(struct descriptor* d)
{
uint8_t* buf = (uint8_t*) d + 2;
uint32_t pos = 0;
uint32_t len = d->len;
struct dvb_extended_event_descriptor * p =
(struct dvb_extended_event_descriptor *) d;
struct dvb_extended_event_descriptor_part2 *p2;
pos += sizeof(struct dvb_extended_event_descriptor) - 2;
if (pos > len)
return NULL;
pos += p->length_of_items;
if (pos > len)
return NULL;
p2 = (struct dvb_extended_event_descriptor_part2*) (buf+pos);
pos += sizeof(struct dvb_extended_event_descriptor_part2);
if (pos > len)
return NULL;
pos += p2->text_length;
if (pos != len)
return NULL;
return p;
}
/**
* Iterator for the items field of a dvb_extended_event_descriptor.
*
* @param d dvb_extended_event_descriptor pointer.
* @param pos Variable containing a pointer to the current dvb_extended_event_item.
*/
#define dvb_extended_event_descriptor_items_for_each(d, pos) \
for ((pos) = dvb_extended_event_descriptor_items_first(d); \
(pos); \
(pos) = dvb_extended_event_descriptor_items_next(d, pos))
/**
* Accessor for the description field of a dvb_extended_event_item.
*
* @param d dvb_extended_event_item pointer.
* @return Pointer to the field.
*/
static inline uint8_t*
dvb_extended_event_item_description(struct dvb_extended_event_item *d)
{
return (uint8_t*) d + sizeof(struct dvb_extended_event_item);
}
/**
* Accessor for the second part of a dvb_extended_event_item.
*
* @param dvb_extended_event_item pointer.
* @return dvb_extended_event_item_part2 pointer.
*/
static inline struct dvb_extended_event_item_part2*
dvb_extended_event_item_part2(struct dvb_extended_event_item *d)
{
return (struct dvb_extended_event_item_part2*)
((uint8_t*) d + sizeof(struct dvb_extended_event_item) +
d->item_description_length);
}
/**
* Accessor for the item field of a dvb_extended_event_item_part2.
*
* @param d dvb_extended_event_item_part2 pointer.
* @return Pointer to the item field.
*/
static inline uint8_t*
dvb_extended_event_item_part2_item(struct dvb_extended_event_item_part2 *d)
{
return (uint8_t*) d + sizeof(struct dvb_extended_event_item_part2);
}
/**
* Accessor for the second part of a dvb_extended_event_descriptor.
*
* @param d dvb_extended_event_descriptor pointer.
* @return dvb_extended_event_descriptor_part2 pointer.
*/
static inline struct dvb_extended_event_descriptor_part2*
dvb_extended_event_descriptor_part2(struct dvb_extended_event_descriptor *d)
{
return (struct dvb_extended_event_descriptor_part2*)
((uint8_t*) d + sizeof(struct dvb_extended_event_descriptor) +
d->length_of_items);
}
/**
* Accessor for the text field of an dvb_extended_event_descriptor_part2.
*
* @param d dvb_extended_event_descriptor_part2 pointer.
* @return Pointer to the text field.
*/
static inline uint8_t*
dvb_extended_event_descriptor_part2_text(struct dvb_extended_event_descriptor_part2 *d)
{
return (uint8_t*)
((uint8_t*) d + sizeof(struct dvb_extended_event_descriptor_part2));
}
/******************************** PRIVATE CODE ********************************/
static inline struct dvb_extended_event_item*
dvb_extended_event_descriptor_items_first(struct dvb_extended_event_descriptor *d)
{
if (d->length_of_items == 0)
return NULL;
return (struct dvb_extended_event_item *)
((uint8_t*) d + sizeof(struct dvb_extended_event_descriptor));
}
static inline struct dvb_extended_event_item*
dvb_extended_event_descriptor_items_next(struct dvb_extended_event_descriptor *d,
struct dvb_extended_event_item *pos)
{
struct dvb_extended_event_item_part2* part2 =
dvb_extended_event_item_part2(pos);
uint8_t *end = (uint8_t*) d + sizeof(struct dvb_extended_event_descriptor) + d->length_of_items;
uint8_t *next = (uint8_t *) part2 +
sizeof(struct dvb_extended_event_item_part2) +
part2->item_length;
if (next >= end)
return NULL;
return (struct dvb_extended_event_item *) next;
}
#ifdef __cplusplus
}
#endif
#endif
|
