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
|
/*
* 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_MPEG_PMT_SECTION_H
#define _UCSI_MPEG_PMT_SECTION_H 1
#ifdef __cplusplus
extern "C"
{
#endif
#include <libucsi/section.h>
/**
* mpeg_pmt_section structure.
*/
struct mpeg_pmt_section {
struct section_ext head;
EBIT2(uint16_t reserved_1 : 3; ,
uint16_t pcr_pid :13; );
EBIT2(uint16_t reserved_2 : 4; ,
uint16_t program_info_length :12; );
/* struct descriptor descriptors[] */
/* struct mpeg_pmt_stream streams[] */
} __ucsi_packed;
/**
* A stream within an mpeg_pmt_section.
*/
struct mpeg_pmt_stream {
uint8_t stream_type;
EBIT2(uint16_t reserved_1 : 3; ,
uint16_t pid :13; );
EBIT2(uint16_t reserved_2 : 4; ,
uint16_t es_info_length :12; );
/* struct descriptor descriptors[] */
} __ucsi_packed;
/**
* Process an mpeg_pmt_section section.
*
* @param section Pointer to the generic section header.
* @return Pointer to the mpeg_pmt_section structure, or NULL on error.
*/
extern struct mpeg_pmt_section *mpeg_pmt_section_codec(struct section_ext *section);
/**
* Accessor for program_number field of a PMT.
*
* @param pmt PMT pointer.
* @return The program_number.
*/
static inline uint16_t mpeg_pmt_section_program_number(struct mpeg_pmt_section *pmt)
{
return pmt->head.table_id_ext;
}
/**
* Convenience iterator for the descriptors field of the mpeg_pmt_section structure.
*
* @param pmt Pointer to the mpeg_pmt_section structure.
* @param pos Variable holding a pointer to the current descriptor.
*/
#define mpeg_pmt_section_descriptors_for_each(pmt, pos) \
for ((pos) = mpeg_pmt_section_descriptors_first(pmt); \
(pos); \
(pos) = mpeg_pmt_section_descriptors_next(pmt, pos))
/**
* Convenience iterator for the streams field of the mpeg_pmt_section structure.
*
* @param pmt Pointer to the mpeg_pmt_section structure.
* @param pos Variable holding a pointer to the current mpeg_pmt_stream.
*/
#define mpeg_pmt_section_streams_for_each(pmt, pos) \
for ((pos) = mpeg_pmt_section_streams_first(pmt); \
(pos); \
(pos) = mpeg_pmt_section_streams_next(pmt, pos))
/**
* Convenience iterator for the descriptors field of an mpeg_pmt_stream structure.
*
* @param stream Pointer to the mpeg_pmt_stream structure.
* @param pos Variable holding a pointer to the current descriptor.
*/
#define mpeg_pmt_stream_descriptors_for_each(stream, pos) \
for ((pos) = mpeg_pmt_stream_descriptors_first(stream); \
(pos); \
(pos) = mpeg_pmt_stream_descriptors_next(stream, pos))
/******************************** PRIVATE CODE ********************************/
static inline struct descriptor *
mpeg_pmt_section_descriptors_first(struct mpeg_pmt_section * pmt)
{
if (pmt->program_info_length == 0)
return NULL;
return (struct descriptor *)
((uint8_t *) pmt + sizeof(struct mpeg_pmt_section));
}
static inline struct descriptor *
mpeg_pmt_section_descriptors_next(struct mpeg_pmt_section *pmt,
struct descriptor* pos)
{
return next_descriptor((uint8_t *) pmt + sizeof(struct mpeg_pmt_section),
pmt->program_info_length,
pos);
}
static inline struct mpeg_pmt_stream *
mpeg_pmt_section_streams_first(struct mpeg_pmt_section * pmt)
{
size_t pos = sizeof(struct mpeg_pmt_section) + pmt->program_info_length;
if (pos >= section_ext_length(&pmt->head))
return NULL;
return (struct mpeg_pmt_stream *)((uint8_t *)pmt + pos);
}
static inline struct mpeg_pmt_stream *
mpeg_pmt_section_streams_next(struct mpeg_pmt_section * pmt,
struct mpeg_pmt_stream * pos)
{
uint8_t *end = (uint8_t*) pmt + section_ext_length(&pmt->head);
uint8_t *next = (uint8_t *) pos + sizeof(struct mpeg_pmt_stream) +
pos->es_info_length;
if (next >= end)
return NULL;
return (struct mpeg_pmt_stream *) next;
}
static inline struct descriptor *
mpeg_pmt_stream_descriptors_first(struct mpeg_pmt_stream *stream)
{
if (stream->es_info_length == 0)
return NULL;
return (struct descriptor *)
((uint8_t*) stream + sizeof(struct mpeg_pmt_stream));
}
static inline struct descriptor *
mpeg_pmt_stream_descriptors_next(struct mpeg_pmt_stream *stream,
struct descriptor* pos)
{
return next_descriptor((uint8_t *) stream + sizeof(struct mpeg_pmt_stream),
stream->es_info_length,
pos);
}
#ifdef __cplusplus
}
#endif
#endif
|
