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/***************************************************************************
copyright : (C) 2006 by Lukáš Lalinský
email : [email protected]
copyright : (C) 2004 by Allan Sandfeld Jensen
email : [email protected]
(original MPC implementation)
***************************************************************************/
/***************************************************************************
* 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., 51 Franklin Street, Fifth Floor, Boston, *
* MA 02110-1301 USA *
***************************************************************************/
#include <tstring.h>
#if 0
#include <tdebug.h>
#endif
#include <bitset>
#include "wvproperties.h"
#include "wvfile.h"
using namespace TagLib;
class WavPack::Properties::PropertiesPrivate
{
public:
PropertiesPrivate(const ByteVector &d, long length, ReadStyle s) :
data(d),
streamLength(length),
style(s),
length(0),
bitrate(0),
sampleRate(0),
channels(0),
version(0),
bitsPerSample(0) {}
ByteVector data;
long streamLength;
ReadStyle style;
int length;
int bitrate;
int sampleRate;
int channels;
int version;
int bitsPerSample;
};
////////////////////////////////////////////////////////////////////////////////
// public members
////////////////////////////////////////////////////////////////////////////////
WavPack::Properties::Properties(const ByteVector &data, long streamLength, ReadStyle style) : AudioProperties(style)
{
d = new PropertiesPrivate(data, streamLength, style);
read();
}
WavPack::Properties::~Properties()
{
delete d;
}
int WavPack::Properties::length() const
{
return d->length;
}
int WavPack::Properties::bitrate() const
{
return d->bitrate;
}
int WavPack::Properties::sampleRate() const
{
return d->sampleRate;
}
int WavPack::Properties::channels() const
{
return d->channels;
}
int WavPack::Properties::version() const
{
return d->version;
}
int WavPack::Properties::bitsPerSample() const
{
return d->bitsPerSample;
}
////////////////////////////////////////////////////////////////////////////////
// private members
////////////////////////////////////////////////////////////////////////////////
static const unsigned int sample_rates[] = { 6000, 8000, 9600, 11025, 12000,
16000, 22050, 24000, 32000, 44100, 48000, 64000, 88200, 96000, 192000 };
#define BYTES_STORED 3
#define MONO_FLAG 4
#define SHIFT_LSB 13
#define SHIFT_MASK (0x1fL << SHIFT_LSB)
#define SRATE_LSB 23
#define SRATE_MASK (0xfL << SRATE_LSB)
void WavPack::Properties::read()
{
if(!d->data.startsWith("wvpk"))
return;
d->version = d->data.mid(8, 2).toShort(false);
unsigned int flags = d->data.mid(24, 4).toUInt(false);
d->bitsPerSample = ((flags & BYTES_STORED) + 1) * 8 -
((flags & SHIFT_MASK) >> SHIFT_LSB);
d->sampleRate = sample_rates[(flags & SRATE_MASK) >> SRATE_LSB];
d->channels = (flags & MONO_FLAG) ? 1 : 2;
unsigned int samples = d->data.mid(12, 4).toUInt(false);
d->length = d->sampleRate > 0 ? (samples + (d->sampleRate / 2)) / d->sampleRate : 0;
d->bitrate = d->length > 0 ? ((d->streamLength * 8L) / d->length) / 1000 : 0;
}
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