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git-svn-id: svn://anonsvn.kde.org/home/kde/trunk/kdesupport/taglib@288617 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
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Scott Wheeler
2004-02-17 02:11:05 +00:00
commit 7fe6647435
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flac/flacproperties.cpp Normal file
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/***************************************************************************
copyright : (C) 2003 by Allan Sandfeld Jensen
email : kde@carewolf.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 *
***************************************************************************/
#include <tstring.h>
#include <tdebug.h>
#include "flacproperties.h"
#include "flacfile.h"
using namespace TagLib;
class FLAC::Properties::PropertiesPrivate
{
public:
PropertiesPrivate(File *f, ReadStyle s) :
file(f),
style(s),
length(0),
bitrate(0),
sampleRate(0),
sampleWidth(0),
channels(0) {}
File *file;
ReadStyle style;
int length;
int bitrate;
int sampleRate;
int sampleWidth;
int channels;
};
////////////////////////////////////////////////////////////////////////////////
// public members
////////////////////////////////////////////////////////////////////////////////
FLAC::Properties::Properties(File *file, ReadStyle style) : AudioProperties(style)
{
d = new PropertiesPrivate(file, style);
read();
}
FLAC::Properties::~Properties()
{
delete d;
}
int FLAC::Properties::length() const
{
return d->length;
}
int FLAC::Properties::bitrate() const
{
return d->bitrate;
}
int FLAC::Properties::sampleRate() const
{
return d->sampleRate;
}
int FLAC::Properties::sampleWidth() const
{
return d->sampleWidth;
}
int FLAC::Properties::channels() const
{
return d->channels;
}
////////////////////////////////////////////////////////////////////////////////
// private members
////////////////////////////////////////////////////////////////////////////////
void FLAC::Properties::read()
{
// Get the identification header.
ByteVector data = d->file->streamInfoData();
int pos = 0;
// Minimum block size (in samples)
pos += 2;
// Maximum block size (in samples)
pos += 2;
// Minimum frame size (in bytes)
pos += 3;
// Maximum frame size (in bytes)
pos += 3;
uint flags = data.mid(pos, 4).toUInt(true);
d->sampleRate = flags >> 12;
d->channels = ((flags >> 9) & 7) + 1;
d->sampleWidth = ((flags >> 4) & 31) + 1;
// The last 4 bit are the most significant 4 bits for the 36bit
// streamlength in samples. (Audio files measured in days)
uint highlength = (((flags & 0xf) << 28) / d->sampleRate) << 4;
pos += 4;
d->length = (data.mid(pos, 4).toUInt(true)) / d->sampleRate + highlength;
pos += 4;
// Uncompressed bitrate:
// d->bitrate = ((d->sampleRate * d->channels) / 1000) * d->sampleWidth;
// Real bitrate:
d->bitrate = ((d->file->streamLength()*8L) / d->length)/1000;
}