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
|
/*****************************************************************
|
| AP4 - odda Atoms
|
| Copyright 2002-2008 Axiomatic Systems, LLC
|
|
| This file is part of Bento4/AP4 (MP4 Atom Processing Library).
|
| Unless you have obtained Bento4 under a difference license,
| this version of Bento4 is Bento4|GPL.
| Bento4|GPL is free software; you can redistribute it and/or modify
| it under the terms of the GNU General Public License as published by
| the Free Software Foundation; either version 2, or (at your option)
| any later version.
|
| Bento4|GPL 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 General Public License for more details.
|
| You should have received a copy of the GNU General Public License
| along with Bento4|GPL; see the file COPYING. If not, write to the
| Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
| 02111-1307, USA.
|
****************************************************************/
/*----------------------------------------------------------------------
| includes
+---------------------------------------------------------------------*/
#include "Ap4Utils.h"
#include "Ap4OddaAtom.h"
/*----------------------------------------------------------------------
| dynamic cast support
+---------------------------------------------------------------------*/
AP4_DEFINE_DYNAMIC_CAST_ANCHOR(AP4_OddaAtom)
/*----------------------------------------------------------------------
| AP4_OddaAtom::Create
+---------------------------------------------------------------------*/
AP4_OddaAtom*
AP4_OddaAtom::Create(AP4_UI64 size,
AP4_ByteStream& stream)
{
AP4_UI08 version;
AP4_UI32 flags;
if (AP4_FAILED(AP4_Atom::ReadFullHeader(stream, version, flags))) return NULL;
if (version != 0) return NULL;
return new AP4_OddaAtom(size, version, flags, stream);
}
/*----------------------------------------------------------------------
| AP4_OddaAtom::AP4_OddaAtom
+---------------------------------------------------------------------*/
AP4_OddaAtom::AP4_OddaAtom(AP4_UI64 size,
AP4_UI08 version,
AP4_UI32 flags,
AP4_ByteStream& stream) :
AP4_Atom(AP4_ATOM_TYPE_ODDA, size, true, version, flags)
{
// data length
stream.ReadUI64(m_EncryptedDataLength);
// get the source stream position
AP4_Position position;
stream.Tell(position);
// create a substream to represent the payload
m_EncryptedPayload = new AP4_SubStream(stream, position, m_EncryptedDataLength);
// seek to the end
stream.Seek(position+m_EncryptedDataLength);
}
/*----------------------------------------------------------------------
| AP4_OddaAtom::AP4_OddaAtom
+---------------------------------------------------------------------*/
AP4_OddaAtom::AP4_OddaAtom(AP4_ByteStream& encrypted_payload) :
AP4_Atom(AP4_ATOM_TYPE_ODDA, 0, true, 0, 0)
{
// encrypted data length
encrypted_payload.GetSize(m_EncryptedDataLength);
// update our size
SetSize(AP4_FULL_ATOM_HEADER_SIZE_64+8+m_EncryptedDataLength, true);
// keep a reference to the encrypted payload
m_EncryptedPayload = &encrypted_payload;
m_EncryptedPayload->AddReference();
}
/*----------------------------------------------------------------------
| AP4_OddaAtom::~AP4_OddaAtom
+---------------------------------------------------------------------*/
AP4_OddaAtom::~AP4_OddaAtom()
{
if (m_EncryptedPayload) m_EncryptedPayload->Release();
}
/*----------------------------------------------------------------------
| AP4_OddaAtom::SetEncryptedPayload
+---------------------------------------------------------------------*/
AP4_Result
AP4_OddaAtom::SetEncryptedPayload(AP4_ByteStream& stream, AP4_LargeSize length)
{
// keep a reference to the stream
if (m_EncryptedPayload) {
m_EncryptedPayload->Release();
}
m_EncryptedPayload = &stream;
m_EncryptedPayload->AddReference();
// update the size
m_EncryptedDataLength = length;
SetSize(AP4_FULL_ATOM_HEADER_SIZE_64 + 8 + length, true);
if (m_Parent) m_Parent->OnChildChanged(this);
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_OddaAtom::SetEncryptedPayload
+---------------------------------------------------------------------*/
AP4_Result
AP4_OddaAtom::SetEncryptedPayload(AP4_ByteStream& stream)
{
// the new encrypted data length is the size of the stream
AP4_LargeSize length;
AP4_Result result = stream.GetSize(length);
if (AP4_FAILED(result)) return result;
return SetEncryptedPayload(stream, length);
}
/*----------------------------------------------------------------------
| AP4_OddaAtom::WriteFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_OddaAtom::WriteFields(AP4_ByteStream& stream)
{
// write the content type
AP4_CHECK(stream.WriteUI64(m_EncryptedDataLength));
// check that we have a source stream
// and a normal size
if (m_EncryptedPayload == NULL || GetSize() < 8) {
return AP4_FAILURE;
}
// rewind the encrypted stream
AP4_CHECK(m_EncryptedPayload->Seek(0));
// copy the encrypted stream to the output
AP4_CHECK(m_EncryptedPayload->CopyTo(stream, m_EncryptedDataLength));
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_OddaAtom::InspectFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_OddaAtom::InspectFields(AP4_AtomInspector& inspector)
{
inspector.AddField("encrypted_data_length", (AP4_UI32)m_EncryptedDataLength);
return AP4_SUCCESS;
}
|
