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
|
/***************************************************************************
copyright : (C) 2003 by Ismael Orenstein
email : orenstein@kde.org
***************************************************************************/
/***************************************************************************
* This library is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License version *
* 2.1 as published by the Free Software Foundation. *
* *
* 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 *
* *
* Alternatively, this file is available under the Mozilla Public *
* License Version 1.1. You may obtain a copy of the License at *
* http://www.mozilla.org/MPL/ *
***************************************************************************/
#include <tbytevector.h>
#include <tstring.h>
#include <tdebug.h>
#include "xingheader.h"
#include "mpegfile.h"
using namespace TagLib;
class MPEG::XingHeader::XingHeaderPrivate
{
public:
XingHeaderPrivate() :
frames(0),
size(0),
type(MPEG::XingHeader::Invalid) {}
unsigned int frames;
unsigned int size;
MPEG::XingHeader::HeaderType type;
};
////////////////////////////////////////////////////////////////////////////////
// public members
////////////////////////////////////////////////////////////////////////////////
MPEG::XingHeader::XingHeader(const ByteVector &data) :
d(new XingHeaderPrivate())
{
parse(data);
}
MPEG::XingHeader::~XingHeader()
{
delete d;
}
bool MPEG::XingHeader::isValid() const
{
return (d->type != Invalid && d->frames > 0 && d->size > 0);
}
unsigned int MPEG::XingHeader::totalFrames() const
{
return d->frames;
}
unsigned int MPEG::XingHeader::totalSize() const
{
return d->size;
}
MPEG::XingHeader::HeaderType MPEG::XingHeader::type() const
{
return d->type;
}
int MPEG::XingHeader::xingHeaderOffset(TagLib::MPEG::Header::Version /*v*/,
TagLib::MPEG::Header::ChannelMode /*c*/)
{
return 0;
}
////////////////////////////////////////////////////////////////////////////////
// private members
////////////////////////////////////////////////////////////////////////////////
void MPEG::XingHeader::parse(const ByteVector &data)
{
// Look for a Xing header.
long offset = data.find("Xing");
if(offset < 0)
offset = data.find("Info");
if(offset >= 0) {
// Xing header found.
if(data.size() < static_cast<unsigned long>(offset + 16)) {
debug("MPEG::XingHeader::parse() -- Xing header found but too short.");
return;
}
if((data[offset + 7] & 0x03) != 0x03) {
debug("MPEG::XingHeader::parse() -- Xing header doesn't contain the required information.");
return;
}
d->frames = data.toUInt(offset + 8, true);
d->size = data.toUInt(offset + 12, true);
d->type = Xing;
}
else {
// Xing header not found. Then look for a VBRI header.
offset = data.find("VBRI");
if(offset >= 0) {
// VBRI header found.
if(data.size() < static_cast<unsigned long>(offset + 32)) {
debug("MPEG::XingHeader::parse() -- VBRI header found but too short.");
return;
}
d->frames = data.toUInt(offset + 14, true);
d->size = data.toUInt(offset + 10, true);
d->type = VBRI;
}
}
}
|
