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