184 lines
5.2 KiB
C++
184 lines
5.2 KiB
C++
/***************************************************************************
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copyright : (C) 2002 - 2008 by Scott Wheeler
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email : wheeler@kde.org
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***************************************************************************/
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/***************************************************************************
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* This library is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU Lesser General Public License version *
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* 2.1 as published by the Free Software Foundation. *
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* *
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* This library is distributed in the hope that it will be useful, but *
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* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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* Lesser General Public License for more details. *
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* *
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* You should have received a copy of the GNU Lesser General Public *
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* License along with this library; if not, write to the Free Software *
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA *
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* 02110-1301 USA *
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* *
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* Alternatively, this file is available under the Mozilla Public *
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* License Version 1.1. You may obtain a copy of the License at *
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* http://www.mozilla.org/MPL/ *
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***************************************************************************/
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#include <tstring.h>
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#include <tdebug.h>
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#include <oggpageheader.h>
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#include "vorbisproperties.h"
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#include "vorbisfile.h"
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using namespace TagLib;
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class Vorbis::Properties::PropertiesPrivate
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{
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public:
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PropertiesPrivate(File *f, ReadStyle s) :
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file(f),
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style(s),
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length(0),
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bitrate(0),
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sampleRate(0),
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channels(0),
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vorbisVersion(0),
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bitrateMaximum(0),
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bitrateNominal(0),
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bitrateMinimum(0) {}
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File *file;
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ReadStyle style;
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int length;
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int bitrate;
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int sampleRate;
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int channels;
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int vorbisVersion;
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int bitrateMaximum;
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int bitrateNominal;
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int bitrateMinimum;
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};
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namespace TagLib {
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/*!
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* Vorbis headers can be found with one type ID byte and the string "vorbis" in
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* an Ogg stream. 0x01 indicates the setup header.
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*/
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static const char vorbisSetupHeaderID[] = { 0x01, 'v', 'o', 'r', 'b', 'i', 's', 0 };
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}
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////////////////////////////////////////////////////////////////////////////////
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// public members
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////////////////////////////////////////////////////////////////////////////////
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Vorbis::Properties::Properties(File *file, ReadStyle style) : AudioProperties(style)
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{
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d = new PropertiesPrivate(file, style);
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read();
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}
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Vorbis::Properties::~Properties()
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{
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delete d;
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}
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int Vorbis::Properties::length() const
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{
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return d->length;
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}
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int Vorbis::Properties::bitrate() const
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{
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return int(float(d->bitrate) / float(1000) + 0.5);
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}
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int Vorbis::Properties::sampleRate() const
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{
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return d->sampleRate;
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}
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int Vorbis::Properties::channels() const
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{
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return d->channels;
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}
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int Vorbis::Properties::vorbisVersion() const
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{
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return d->vorbisVersion;
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}
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int Vorbis::Properties::bitrateMaximum() const
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{
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return d->bitrateMaximum;
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}
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int Vorbis::Properties::bitrateNominal() const
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{
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return d->bitrateNominal;
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}
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int Vorbis::Properties::bitrateMinimum() const
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{
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return d->bitrateMinimum;
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}
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////////////////////////////////////////////////////////////////////////////////
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// private members
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////////////////////////////////////////////////////////////////////////////////
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void Vorbis::Properties::read()
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{
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// Get the identification header from the Ogg implementation.
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ByteVector data = d->file->packet(0);
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uint pos = 0;
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if(data.mid(pos, 7) != vorbisSetupHeaderID) {
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debug("Vorbis::Properties::read() -- invalid Vorbis identification header");
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return;
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}
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pos += 7;
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d->vorbisVersion = data.toUInt(pos, false);
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pos += 4;
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d->channels = uchar(data[pos]);
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pos += 1;
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d->sampleRate = data.toUInt(pos, false);
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pos += 4;
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d->bitrateMaximum = data.toUInt(pos, false);
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pos += 4;
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d->bitrateNominal = data.toUInt(pos, false);
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pos += 4;
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d->bitrateMinimum = data.toUInt(pos, false);
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// TODO: Later this should be only the "fast" mode.
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d->bitrate = d->bitrateNominal;
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// Find the length of the file. See http://wiki.xiph.org/VorbisStreamLength/
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// for my notes on the topic.
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const Ogg::PageHeader *first = d->file->firstPageHeader();
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const Ogg::PageHeader *last = d->file->lastPageHeader();
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if(first && last) {
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long long start = first->absoluteGranularPosition();
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long long end = last->absoluteGranularPosition();
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if(start >= 0 && end >= 0 && d->sampleRate > 0)
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d->length = (int)((end - start) / (long long) d->sampleRate);
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else
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debug("Vorbis::Properties::read() -- Either the PCM values for the start or "
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"end of this file was incorrect or the sample rate is zero.");
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}
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else
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debug("Vorbis::Properties::read() -- Could not find valid first and last Ogg pages.");
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}
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