mirror of
https://github.com/taglib/taglib.git
synced 2025-05-27 21:20:26 -04:00
7fe6647435
a server-side copy/move. git-svn-id: svn://anonsvn.kde.org/home/kde/trunk/kdesupport/taglib@288617 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
139 lines
3.7 KiB
C++
139 lines
3.7 KiB
C++
/***************************************************************************
|
|
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;
|
|
|
|
|
|
}
|