1 /***************************************************************************
2 copyright : (C) 2003 by Allan Sandfeld Jensen
3 email : kde@carewolf.org
4 ***************************************************************************/
5
6 /***************************************************************************
7 * This library is free software; you can redistribute it and/or modify *
8 * it under the terms of the GNU Lesser General Public License version *
9 * 2.1 as published by the Free Software Foundation. *
10 * *
11 * This library is distributed in the hope that it will be useful, but *
12 * WITHOUT ANY WARRANTY; without even the implied warranty of *
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
14 * Lesser General Public License for more details. *
15 * *
16 * You should have received a copy of the GNU Lesser General Public *
17 * License along with this library; if not, write to the Free Software *
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA *
19 * 02110-1301 USA *
20 * *
21 * Alternatively, this file is available under the Mozilla Public *
22 * License Version 1.1. You may obtain a copy of the License at *
23 * http://www.mozilla.org/MPL/ *
24 ***************************************************************************/
25
26 #include <tstring.h>
27 #include <tdebug.h>
28
29 #include "flacproperties.h"
30 #include "flacfile.h"
31
32 using namespace TagLib;
33
34 class FLAC::Properties::PropertiesPrivate
35 {
36 public:
PropertiesPrivate()37 PropertiesPrivate() :
38 length(0),
39 bitrate(0),
40 sampleRate(0),
41 bitsPerSample(0),
42 channels(0),
43 sampleFrames(0) {}
44
45 int length;
46 int bitrate;
47 int sampleRate;
48 int bitsPerSample;
49 int channels;
50 unsigned long long sampleFrames;
51 ByteVector signature;
52 };
53
54 ////////////////////////////////////////////////////////////////////////////////
55 // public members
56 ////////////////////////////////////////////////////////////////////////////////
57
Properties(ByteVector data,long streamLength,ReadStyle style)58 FLAC::Properties::Properties(ByteVector data, long streamLength, ReadStyle style) :
59 AudioProperties(style),
60 d(new PropertiesPrivate())
61 {
62 read(data, streamLength);
63 }
64
Properties(File *,ReadStyle style)65 FLAC::Properties::Properties(File *, ReadStyle style) :
66 AudioProperties(style),
67 d(new PropertiesPrivate())
68 {
69 debug("FLAC::Properties::Properties() - This constructor is no longer used.");
70 }
71
~Properties()72 FLAC::Properties::~Properties()
73 {
74 delete d;
75 }
76
length() const77 int FLAC::Properties::length() const
78 {
79 return lengthInSeconds();
80 }
81
lengthInSeconds() const82 int FLAC::Properties::lengthInSeconds() const
83 {
84 return d->length / 1000;
85 }
86
lengthInMilliseconds() const87 int FLAC::Properties::lengthInMilliseconds() const
88 {
89 return d->length;
90 }
91
bitrate() const92 int FLAC::Properties::bitrate() const
93 {
94 return d->bitrate;
95 }
96
sampleRate() const97 int FLAC::Properties::sampleRate() const
98 {
99 return d->sampleRate;
100 }
101
bitsPerSample() const102 int FLAC::Properties::bitsPerSample() const
103 {
104 return d->bitsPerSample;
105 }
106
sampleWidth() const107 int FLAC::Properties::sampleWidth() const
108 {
109 return bitsPerSample();
110 }
111
channels() const112 int FLAC::Properties::channels() const
113 {
114 return d->channels;
115 }
116
sampleFrames() const117 unsigned long long FLAC::Properties::sampleFrames() const
118 {
119 return d->sampleFrames;
120 }
121
signature() const122 ByteVector FLAC::Properties::signature() const
123 {
124 return d->signature;
125 }
126
127 ////////////////////////////////////////////////////////////////////////////////
128 // private members
129 ////////////////////////////////////////////////////////////////////////////////
130
read(const ByteVector & data,long streamLength)131 void FLAC::Properties::read(const ByteVector &data, long streamLength)
132 {
133 if(data.size() < 18) {
134 debug("FLAC::Properties::read() - FLAC properties must contain at least 18 bytes.");
135 return;
136 }
137
138 unsigned int pos = 0;
139
140 // Minimum block size (in samples)
141 pos += 2;
142
143 // Maximum block size (in samples)
144 pos += 2;
145
146 // Minimum frame size (in bytes)
147 pos += 3;
148
149 // Maximum frame size (in bytes)
150 pos += 3;
151
152 const unsigned int flags = data.toUInt(pos, true);
153 pos += 4;
154
155 d->sampleRate = flags >> 12;
156 d->channels = ((flags >> 9) & 7) + 1;
157 d->bitsPerSample = ((flags >> 4) & 31) + 1;
158
159 // The last 4 bits are the most significant 4 bits for the 36 bit
160 // stream length in samples. (Audio files measured in days)
161
162 const unsigned long long hi = flags & 0xf;
163 const unsigned long long lo = data.toUInt(pos, true);
164 pos += 4;
165
166 d->sampleFrames = (hi << 32) | lo;
167
168 if(d->sampleFrames > 0 && d->sampleRate > 0) {
169 const double length = d->sampleFrames * 1000.0 / d->sampleRate;
170 d->length = static_cast<int>(length + 0.5);
171 d->bitrate = static_cast<int>(streamLength * 8.0 / length + 0.5);
172 }
173
174 if(data.size() >= pos + 16)
175 d->signature = data.mid(pos, 16);
176 }
177