161 lines
4.9 KiB
C++
161 lines
4.9 KiB
C++
/***************************************************************************
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copyright : (C) 2008 by Scott Wheeler
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email : wheeler@kde.org
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***************************************************************************/
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/***************************************************************************
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* This library is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU Lesser General Public License version *
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* 2.1 as published by the Free Software Foundation. *
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* *
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* This library is distributed in the hope that it will be useful, but *
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* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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* Lesser General Public License for more details. *
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* *
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* You should have received a copy of the GNU Lesser General Public *
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* License along with this library; if not, write to the Free Software *
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA *
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* 02110-1301 USA *
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* *
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* Alternatively, this file is available under the Mozilla Public *
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* License Version 1.1. You may obtain a copy of the License at *
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* http://www.mozilla.org/MPL/ *
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***************************************************************************/
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#include <tstring.h>
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#include <tdebug.h>
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#include <cmath>
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// ldexp is a c99 function, which might not be defined in <cmath>
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// so we pull in math.h too and hope it does the right (wrong) thing
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// wrt. c99 functions in C++
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#include <math.h>
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#include "aiffproperties.h"
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////////////////////////////////////////////////////////////////////////////////
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// nasty 80-bit float helpers
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////////////////////////////////////////////////////////////////////////////////
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#define UnsignedToFloat(u) (((double)((long)(u - 2147483647L - 1))) + 2147483648.0)
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static double ConvertFromIeeeExtended(const TagLib::uchar *bytes)
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{
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double f;
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int expon;
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unsigned long hiMant, loMant;
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expon = ((bytes[0] & 0x7F) << 8) | (bytes[1] & 0xFF);
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hiMant = ((unsigned long)(bytes[2] & 0xFF) << 24) |
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((unsigned long)(bytes[3] & 0xFF) << 16) |
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((unsigned long)(bytes[4] & 0xFF) << 8) |
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((unsigned long)(bytes[5] & 0xFF));
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loMant = ((unsigned long)(bytes[6] & 0xFF) << 24) |
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((unsigned long)(bytes[7] & 0xFF) << 16) |
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((unsigned long)(bytes[8] & 0xFF) << 8) |
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((unsigned long)(bytes[9] & 0xFF));
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if (expon == 0 && hiMant == 0 && loMant == 0)
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f = 0;
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else {
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if(expon == 0x7FFF) /* Infinity or NaN */
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f = HUGE_VAL;
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else {
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expon -= 16383;
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f = ldexp(UnsignedToFloat(hiMant), expon -= 31);
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f += ldexp(UnsignedToFloat(loMant), expon -= 32);
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}
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}
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if(bytes[0] & 0x80)
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return -f;
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else
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return f;
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}
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using namespace TagLib;
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class RIFF::AIFF::Properties::PropertiesPrivate
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{
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public:
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PropertiesPrivate() :
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length(0),
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bitrate(0),
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sampleRate(0),
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channels(0),
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sampleWidth(0),
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sampleFrames(0)
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{
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}
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int length;
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int bitrate;
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int sampleRate;
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int channels;
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int sampleWidth;
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uint sampleFrames;
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};
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////////////////////////////////////////////////////////////////////////////////
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// public members
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////////////////////////////////////////////////////////////////////////////////
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RIFF::AIFF::Properties::Properties(const ByteVector &data, ReadStyle style) : AudioProperties(style)
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{
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d = new PropertiesPrivate;
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read(data);
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}
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RIFF::AIFF::Properties::~Properties()
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{
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delete d;
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}
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int RIFF::AIFF::Properties::length() const
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{
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return d->length;
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}
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int RIFF::AIFF::Properties::bitrate() const
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{
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return d->bitrate;
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}
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int RIFF::AIFF::Properties::sampleRate() const
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{
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return d->sampleRate;
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}
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int RIFF::AIFF::Properties::channels() const
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{
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return d->channels;
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}
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int RIFF::AIFF::Properties::sampleWidth() const
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{
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return d->sampleWidth;
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}
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TagLib::uint RIFF::AIFF::Properties::sampleFrames() const
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{
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return d->sampleFrames;
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}
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////////////////////////////////////////////////////////////////////////////////
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// private members
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////////////////////////////////////////////////////////////////////////////////
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void RIFF::AIFF::Properties::read(const ByteVector &data)
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{
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d->channels = data.toShort(0U);
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d->sampleFrames = data.toUInt(2U);
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d->sampleWidth = data.toShort(6U);
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double sampleRate = ConvertFromIeeeExtended(reinterpret_cast<const uchar *>(data.data() + 8));
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d->sampleRate = (int)sampleRate;
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d->bitrate = (int)((sampleRate * d->sampleWidth * d->channels) / 1000.0);
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d->length = d->sampleRate > 0 ? d->sampleFrames / d->sampleRate : 0;
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}
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