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abbf24ade7
BUG: 99829 git-svn-id: svn://anonsvn.kde.org/home/kde/trunk/kdesupport/taglib@402712 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
141 lines
3.9 KiB
C++
141 lines
3.9 KiB
C++
/***************************************************************************
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copyright : (C) 2004 by Allan Sandfeld Jensen
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email : kde@carewolf.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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
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* USA *
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***************************************************************************/
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#include <tstring.h>
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#include <tdebug.h>
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#include <bitset>
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#include "mpcproperties.h"
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#include "mpcfile.h"
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using namespace TagLib;
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class MPC::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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version(0),
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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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ByteVector data;
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long streamLength;
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ReadStyle style;
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int version;
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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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};
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////////////////////////////////////////////////////////////////////////////////
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// public members
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////////////////////////////////////////////////////////////////////////////////
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MPC::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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MPC::Properties::~Properties()
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{
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delete d;
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}
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int MPC::Properties::length() const
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{
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return d->length;
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}
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int MPC::Properties::bitrate() const
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{
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return d->bitrate;
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}
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int MPC::Properties::sampleRate() const
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{
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return d->sampleRate;
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}
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/*
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int MPC::Properties::sampleWidth() const
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{
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return d->sampleWidth;
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}
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*/
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int MPC::Properties::channels() const
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{
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return d->channels;
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}
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int MPC::Properties::mpcVersion() const
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{
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return d->version;
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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 short sftable [4] = { 44100, 48000, 37800, 32000 };
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void MPC::Properties::read()
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{
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if(!d->data.startsWith("MP+"))
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return;
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d->version = d->data[3] & 15;
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unsigned int frames;
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if(d->version >= 7) {
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frames = d->data.mid(4, 4).toUInt(false);
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std::bitset<32> flags = d->data.mid(8, 4).toUInt(false);
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d->sampleRate = sftable[flags[17] * 2 + flags[16]];
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d->channels = 2;
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}
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else {
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unsigned int headerData = d->data.mid(0, 4).toUInt(false);
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d->bitrate = (headerData >> 23) & 0x01ff;
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d->version = (headerData >> 11) & 0x03ff;
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d->sampleRate = 44100;
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d->channels = 2;
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if(d->version >= 5)
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frames = d->data.mid(4, 4).toUInt(false);
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else
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frames = d->data.mid(4, 2).toUInt(false);
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}
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unsigned int samples = frames * 1152 - 576;
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d->length = d->sampleRate > 0 ? (samples + (d->sampleRate / 2)) / d->sampleRate : 0;
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if(!d->bitrate)
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d->bitrate = d->length > 0 ? ((d->streamLength * 8L) / d->length) / 1000 : 0;
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}
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