1 /***************************************************************************
2 copyright : (C) 2003 by Allan Sandfeld Jensen
3 email : kde@carewolf.org
4 ***************************************************************************/
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. *
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. *
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
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 ***************************************************************************/
29 #include "flacproperties.h"
32 using namespace TagLib;
34 class FLAC::Properties::PropertiesPrivate
37 PropertiesPrivate(ByteVector d, long st, ReadStyle s) :
57 ////////////////////////////////////////////////////////////////////////////////
59 ////////////////////////////////////////////////////////////////////////////////
61 FLAC::Properties::Properties(ByteVector data, long streamLength, ReadStyle style) : AudioProperties(style)
63 d = new PropertiesPrivate(data, streamLength, style);
67 FLAC::Properties::Properties(File *file, ReadStyle style) : AudioProperties(style)
69 d = new PropertiesPrivate(file->streamInfoData(), file->streamLength(), style);
73 FLAC::Properties::~Properties()
78 int FLAC::Properties::length() const
83 int FLAC::Properties::bitrate() const
88 int FLAC::Properties::sampleRate() const
93 int FLAC::Properties::sampleWidth() const
95 return d->sampleWidth;
98 int FLAC::Properties::channels() const
103 ////////////////////////////////////////////////////////////////////////////////
105 ////////////////////////////////////////////////////////////////////////////////
107 void FLAC::Properties::read()
109 if(d->data.size() < 18) {
110 debug("FLAC::Properties::read() - FLAC properties must contain at least 18 bytes.");
116 // Minimum block size (in samples)
119 // Maximum block size (in samples)
122 // Minimum frame size (in bytes)
125 // Maximum frame size (in bytes)
128 uint flags = d->data.mid(pos, 4).toUInt(true);
129 d->sampleRate = flags >> 12;
130 d->channels = ((flags >> 9) & 7) + 1;
131 d->sampleWidth = ((flags >> 4) & 31) + 1;
133 // The last 4 bits are the most significant 4 bits for the 36 bit
134 // stream length in samples. (Audio files measured in days)
136 uint highLength =d->sampleRate > 0 ? (((flags & 0xf) << 28) / d->sampleRate) << 4 : 0;
139 d->length = d->sampleRate > 0 ?
140 (d->data.mid(pos, 4).toUInt(true)) / d->sampleRate + highLength : 0;
143 // Uncompressed bitrate:
145 //d->bitrate = ((d->sampleRate * d->channels) / 1000) * d->sampleWidth;
149 d->bitrate = d->length > 0 ? ((d->streamLength * 8UL) / d->length) / 1000 : 0;