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/***************************************************************************
copyright : (C) 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., 51 Franklin Street, Fifth Floor, Boston, MA *
* 02110-1301 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 <cmath>
// ldexp is a c99 function, which might not be defined in <cmath>
// so we pull in math.h too and hope it does the right (wrong) thing
// wrt. c99 functions in C++
#include <math.h>
#include "aiffproperties.h"
////////////////////////////////////////////////////////////////////////////////
// nasty 80-bit float helpers
////////////////////////////////////////////////////////////////////////////////
#define UnsignedToFloat(u) (((double)((long)(u - 2147483647L - 1))) + 2147483648.0)
static double ConvertFromIeeeExtended(unsigned char *bytes)
{
double f;
int expon;
unsigned long hiMant, loMant;
expon = ((bytes[0] & 0x7F) << 8) | (bytes[1] & 0xFF);
hiMant = ((unsigned long)(bytes[2] & 0xFF) << 24) |
((unsigned long)(bytes[3] & 0xFF) << 16) |
((unsigned long)(bytes[4] & 0xFF) << 8) |
((unsigned long)(bytes[5] & 0xFF));
loMant = ((unsigned long)(bytes[6] & 0xFF) << 24) |
((unsigned long)(bytes[7] & 0xFF) << 16) |
((unsigned long)(bytes[8] & 0xFF) << 8) |
((unsigned long)(bytes[9] & 0xFF));
if (expon == 0 && hiMant == 0 && loMant == 0)
f = 0;
else {
if(expon == 0x7FFF) /* Infinity or NaN */
f = HUGE_VAL;
else {
expon -= 16383;
f = ldexp(UnsignedToFloat(hiMant), expon -= 31);
f += ldexp(UnsignedToFloat(loMant), expon -= 32);
}
}
if(bytes[0] & 0x80)
return -f;
else
return f;
}
using namespace TagLib;
class RIFF::AIFF::Properties::PropertiesPrivate
{
public:
PropertiesPrivate() :
length(0),
bitrate(0),
sampleRate(0),
channels(0),
sampleWidth(0),
sampleFrames(0)
{
}
int length;
int bitrate;
int sampleRate;
int channels;
int sampleWidth;
uint sampleFrames;
};
////////////////////////////////////////////////////////////////////////////////
// public members
////////////////////////////////////////////////////////////////////////////////
RIFF::AIFF::Properties::Properties(const ByteVector &data, ReadStyle style) : AudioProperties(style)
{
d = new PropertiesPrivate;
read(data);
}
RIFF::AIFF::Properties::~Properties()
{
delete d;
}
int RIFF::AIFF::Properties::length() const
{
return d->length;
}
int RIFF::AIFF::Properties::bitrate() const
{
return d->bitrate;
}
int RIFF::AIFF::Properties::sampleRate() const
{
return d->sampleRate;
}
int RIFF::AIFF::Properties::channels() const
{
return d->channels;
}
int RIFF::AIFF::Properties::sampleWidth() const
{
return d->sampleWidth;
}
uint RIFF::AIFF::Properties::sampleFrames() const
{
return d->sampleFrames;
}
////////////////////////////////////////////////////////////////////////////////
// private members
////////////////////////////////////////////////////////////////////////////////
void RIFF::AIFF::Properties::read(const ByteVector &data)
{
d->channels = data.mid(0, 2).toShort();
d->sampleFrames = data.mid(2, 4).toUInt();
d->sampleWidth = data.mid(6, 2).toShort();
double sampleRate = ConvertFromIeeeExtended(reinterpret_cast<unsigned char *>(data.mid(8, 10).data()));
d->sampleRate = sampleRate;
d->bitrate = (sampleRate * d->sampleWidth * d->channels) / 1000.0;
d->length = d->sampleFrames / d->sampleRate;
}
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