1 /***************************************************************************
2 copyright : (C) 2002 - 2008 by Scott Wheeler
3 email : wheeler@kde.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 <oggpageheader.h>
31 #include "vorbisproperties.h"
32 #include "vorbisfile.h"
34 using namespace TagLib;
36 class Vorbis::Properties::PropertiesPrivate
39 PropertiesPrivate(File *f, ReadStyle s) :
65 * Vorbis headers can be found with one type ID byte and the string "vorbis" in
66 * an Ogg stream. 0x01 indicates the setup header.
68 static const char vorbisSetupHeaderID[] = { 0x01, 'v', 'o', 'r', 'b', 'i', 's', 0 };
71 ////////////////////////////////////////////////////////////////////////////////
73 ////////////////////////////////////////////////////////////////////////////////
75 Vorbis::Properties::Properties(File *file, ReadStyle style) : AudioProperties(style)
77 d = new PropertiesPrivate(file, style);
81 Vorbis::Properties::~Properties()
86 int Vorbis::Properties::length() const
91 int Vorbis::Properties::bitrate() const
93 return int(float(d->bitrate) / float(1000) + 0.5);
96 int Vorbis::Properties::sampleRate() const
101 int Vorbis::Properties::channels() const
106 int Vorbis::Properties::vorbisVersion() const
108 return d->vorbisVersion;
111 int Vorbis::Properties::bitrateMaximum() const
113 return d->bitrateMaximum;
116 int Vorbis::Properties::bitrateNominal() const
118 return d->bitrateNominal;
121 int Vorbis::Properties::bitrateMinimum() const
123 return d->bitrateMinimum;
126 ////////////////////////////////////////////////////////////////////////////////
128 ////////////////////////////////////////////////////////////////////////////////
130 void Vorbis::Properties::read()
132 // Get the identification header from the Ogg implementation.
134 ByteVector data = d->file->packet(0);
138 if(data.mid(pos, 7) != vorbisSetupHeaderID) {
139 debug("Vorbis::Properties::read() -- invalid Vorbis identification header");
145 d->vorbisVersion = data.mid(pos, 4).toUInt(false);
148 d->channels = uchar(data[pos]);
151 d->sampleRate = data.mid(pos, 4).toUInt(false);
154 d->bitrateMaximum = data.mid(pos, 4).toUInt(false);
157 d->bitrateNominal = data.mid(pos, 4).toUInt(false);
160 d->bitrateMinimum = data.mid(pos, 4).toUInt(false);
162 // TODO: Later this should be only the "fast" mode.
163 d->bitrate = d->bitrateNominal;
165 // Find the length of the file. See http://wiki.xiph.org/VorbisStreamLength/
166 // for my notes on the topic.
168 const Ogg::PageHeader *first = d->file->firstPageHeader();
169 const Ogg::PageHeader *last = d->file->lastPageHeader();
172 long long start = first->absoluteGranularPosition();
173 long long end = last->absoluteGranularPosition();
175 if(start >= 0 && end >= 0 && d->sampleRate > 0)
176 d->length = (end - start) / (long long) d->sampleRate;
178 debug("Vorbis::Properties::read() -- Either the PCM values for the start or "
179 "end of this file was incorrect or the sample rate is zero.");
182 debug("Vorbis::Properties::read() -- Could not find valid first and last Ogg pages.");