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
|
/*
* 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_ISO_639_LANGUAGE_DESCRIPTOR
#define _UCSI_MPEG_ISO_639_LANGUAGE_DESCRIPTOR 1
#ifdef __cplusplus
extern "C"
{
#endif
#include <libucsi/descriptor.h>
#include <libucsi/endianops.h>
#include <libucsi/types.h>
/**
* Possible values for audio_type.
*/
enum {
MPEG_AUDIO_TYPE_CLEAN_EFFECTS = 0x01,
MPEG_AUDIO_TYPE_HEARING_IMPAIRED = 0x02,
MPEG_AUDIO_TYPE_VISUAL_IMPAIRED_COMMENTARY = 0x03,
};
/**
* mpeg_iso_639_language_descriptor structure.
*/
struct mpeg_iso_639_language_descriptor {
struct descriptor d;
/* struct mpeg_iso_639_language_code languages[] */
} __ucsi_packed;
/**
* An entry in the mpeg_iso_639_language_descriptor languages field.
*/
struct mpeg_iso_639_language_code {
iso639lang_t language_code;
uint8_t audio_type;
} __ucsi_packed;
/**
* Process an mpeg_iso_639_language_descriptor.
*
* @param d Generic descriptor structure.
* @return Pointer to an mpeg_iso_639_language_descriptor structure, or NULL
* on error.
*/
static inline struct mpeg_iso_639_language_descriptor*
mpeg_iso_639_language_descriptor_codec(struct descriptor* d)
{
if (d->len % sizeof(struct mpeg_iso_639_language_code))
return NULL;
return (struct mpeg_iso_639_language_descriptor*) d;
}
/**
* Convenience iterator for the languages field of an mpeg_iso_639_language_descriptor
*
* @param d Pointer to the mpeg_iso_639_language_descriptor structure.
* @param pos Variable holding a pointer to the current entry.
*/
#define mpeg_iso_639_language_descriptor_languages_for_each(_d, _pos) \
for ((_pos) = mpeg_iso_639_language_descriptor_languages_first(_d); \
(_pos); \
(_pos) = mpeg_iso_639_language_descriptor_languages_next(_d, _pos))
/******************************** PRIVATE CODE ********************************/
static inline struct mpeg_iso_639_language_code*
mpeg_iso_639_language_descriptor_languages_first(struct mpeg_iso_639_language_descriptor *d)
{
if (d->d.len < sizeof(struct mpeg_iso_639_language_code))
return NULL;
return (struct mpeg_iso_639_language_code *)
((uint8_t*) d + sizeof(struct mpeg_iso_639_language_descriptor));
}
static inline struct mpeg_iso_639_language_code*
mpeg_iso_639_language_descriptor_languages_next(struct mpeg_iso_639_language_descriptor *d,
struct mpeg_iso_639_language_code *pos)
{
uint8_t *end = (uint8_t*) d + 2 + d->d.len;
uint8_t *next = (uint8_t *) pos + sizeof(struct mpeg_iso_639_language_code);
if (next >= end)
return NULL;
return (struct mpeg_iso_639_language_code *) next;
}
#ifdef __cplusplus
}
#endif
#endif
|
