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/***************************************************************************
copyright : (C) 2002 - 2008 by Scott Wheeler
email : wheeler@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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
* 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 <tstring.h>
#include <tdebug.h>
#include <oggpageheader.h>
#include "vorbisproperties.h"
#include "vorbisfile.h"
using namespace TagLib;
class Vorbis::Properties::PropertiesPrivate
{
public:
PropertiesPrivate(File *f, ReadStyle s) :
file(f),
style(s),
length(0),
bitrate(0),
sampleRate(0),
channels(0),
vorbisVersion(0),
bitrateMaximum(0),
bitrateNominal(0),
bitrateMinimum(0) {}
File *file;
ReadStyle style;
int length;
int bitrate;
int sampleRate;
int channels;
int vorbisVersion;
int bitrateMaximum;
int bitrateNominal;
int bitrateMinimum;
};
namespace TagLib {
/*!
* Vorbis headers can be found with one type ID byte and the string "vorbis" in
* an Ogg stream. 0x01 indicates the setup header.
*/
static const char vorbisSetupHeaderID[] = { 0x01, 'v', 'o', 'r', 'b', 'i', 's', 0 };
}
////////////////////////////////////////////////////////////////////////////////
// public members
////////////////////////////////////////////////////////////////////////////////
Vorbis::Properties::Properties(File *file, ReadStyle style) : AudioProperties(style)
{
d = new PropertiesPrivate(file, style);
read();
}
Vorbis::Properties::~Properties()
{
delete d;
}
int Vorbis::Properties::length() const
{
return d->length;
}
int Vorbis::Properties::bitrate() const
{
return int(float(d->bitrate) / float(1000) + 0.5);
}
int Vorbis::Properties::sampleRate() const
{
return d->sampleRate;
}
int Vorbis::Properties::channels() const
{
return d->channels;
}
int Vorbis::Properties::vorbisVersion() const
{
return d->vorbisVersion;
}
int Vorbis::Properties::bitrateMaximum() const
{
return d->bitrateMaximum;
}
int Vorbis::Properties::bitrateNominal() const
{
return d->bitrateNominal;
}
int Vorbis::Properties::bitrateMinimum() const
{
return d->bitrateMinimum;
}
////////////////////////////////////////////////////////////////////////////////
// private members
////////////////////////////////////////////////////////////////////////////////
void Vorbis::Properties::read()
{
// Get the identification header from the Ogg implementation.
ByteVector data = d->file->packet(0);
int pos = 0;
if(data.mid(pos, 7) != vorbisSetupHeaderID) {
debug("Vorbis::Properties::read() -- invalid Vorbis identification header");
return;
}
pos += 7;
d->vorbisVersion = data.mid(pos, 4).toUInt(false);
pos += 4;
d->channels = uchar(data[pos]);
pos += 1;
d->sampleRate = data.mid(pos, 4).toUInt(false);
pos += 4;
d->bitrateMaximum = data.mid(pos, 4).toUInt(false);
pos += 4;
d->bitrateNominal = data.mid(pos, 4).toUInt(false);
pos += 4;
d->bitrateMinimum = data.mid(pos, 4).toUInt(false);
// TODO: Later this should be only the "fast" mode.
d->bitrate = d->bitrateNominal;
// Find the length of the file. See http://wiki.xiph.org/VorbisStreamLength/
// for my notes on the topic.
const Ogg::PageHeader *first = d->file->firstPageHeader();
const Ogg::PageHeader *last = d->file->lastPageHeader();
if(first && last) {
long long start = first->absoluteGranularPosition();
long long end = last->absoluteGranularPosition();
if(start >= 0 && end >= 0 && d->sampleRate > 0)
d->length = (end - start) / (long long) d->sampleRate;
else {
debug("Vorbis::Properties::read() -- Either the PCM values for the start or "
"end of this file was incorrect or the sample rate is zero.");
}
}
else {
debug("Vorbis::Properties::read() -- Could not find valid first and last Ogg pages.");
}
}
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