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
|
/*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is MPEG4IP.
*
* The Initial Developer of the Original Code is Cisco Systems Inc.
* Portions created by Cisco Systems Inc. are
* Copyright (C) Cisco Systems Inc. 2001. All Rights Reserved.
*
* Contributor(s):
* Dave Mackie [email protected]
*/
#include "src/impl.h"
namespace mp4v2 {
namespace impl {
///////////////////////////////////////////////////////////////////////////////
MP4TkhdAtom::MP4TkhdAtom(MP4File &file)
: MP4Atom(file, "tkhd")
{
AddVersionAndFlags();
}
void MP4TkhdAtom::AddProperties(uint8_t version)
{
if (version == 1) {
AddProperty( /* 2 */
new MP4Integer64Property(*this, "creationTime"));
AddProperty( /* 3 */
new MP4Integer64Property(*this, "modificationTime"));
} else { // version == 0
AddProperty( /* 2 */
new MP4Integer32Property(*this, "creationTime"));
AddProperty( /* 3 */
new MP4Integer32Property(*this, "modificationTime"));
}
AddProperty( /* 4 */
new MP4Integer32Property(*this, "trackId"));
AddReserved(*this, "reserved1", 4); /* 5 */
if (version == 1) {
AddProperty( /* 6 */
new MP4Integer64Property(*this, "duration"));
} else {
AddProperty( /* 6 */
new MP4Integer32Property(*this, "duration"));
}
AddReserved(*this, "reserved2", 8); /* 7 */
AddProperty( /* 8 */
new MP4Integer16Property(*this, "layer"));
AddProperty( /* 9 */
new MP4Integer16Property(*this, "alternate_group"));
MP4Float32Property* pProp;
pProp = new MP4Float32Property(*this, "volume");
pProp->SetFixed16Format();
AddProperty(pProp); /* 10 */
AddReserved(*this, "reserved3", 2); /* 11 */
AddProperty(new MP4BytesProperty(*this, "matrix", 36)); /* 12 */
pProp = new MP4Float32Property(*this, "width");
pProp->SetFixed32Format();
AddProperty(pProp); /* 13 */
pProp = new MP4Float32Property(*this, "height");
pProp->SetFixed32Format();
AddProperty(pProp); /* 14 */
}
void MP4TkhdAtom::Generate()
{
uint8_t version = m_File.Use64Bits(GetType()) ? 1 : 0;
SetVersion(version);
AddProperties(version);
MP4Atom::Generate();
// set creation and modification times
MP4Timestamp now = MP4GetAbsTimestamp();
if (version == 1) {
((MP4Integer64Property*)m_pProperties[2])->SetValue(now);
((MP4Integer64Property*)m_pProperties[3])->SetValue(now);
} else {
((MP4Integer32Property*)m_pProperties[2])->SetValue(now);
((MP4Integer32Property*)m_pProperties[3])->SetValue(now);
}
// property "matrix" has non-zero fixed values
// this default identity matrix indicates no transformation, i.e.
// 1, 0, 0
// 0, 1, 0
// 0, 0, 1
// see http://developer.apple.com/documentation/QuickTime/QTFF/QTFFChap4/chapter_5_section_4.html
static uint8_t matrix[36] = {
0x00, 0x01, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x01, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x40, 0x00, 0x00, 0x00,
};
((MP4BytesProperty*)m_pProperties[12])->
SetValue(matrix, sizeof(matrix));
}
void MP4TkhdAtom::Read()
{
/* read atom version */
ReadProperties(0, 1);
/* need to create the properties based on the atom version */
AddProperties(GetVersion());
/* now we can read the remaining properties */
ReadProperties(1);
Skip(); // to end of atom
}
///////////////////////////////////////////////////////////////////////////////
}
} // namespace mp4v2::impl
|
