177 lines
4.8 KiB
C++
177 lines
4.8 KiB
C++
/***************************************************************************
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copyright : (C) 2003 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., 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 "flacproperties.h"
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#include "flacfile.h"
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using namespace TagLib;
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class FLAC::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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bitsPerSample(0),
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channels(0),
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sampleFrames(0) {}
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int length;
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int bitrate;
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int sampleRate;
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int bitsPerSample;
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int channels;
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unsigned long long sampleFrames;
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ByteVector signature;
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};
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////////////////////////////////////////////////////////////////////////////////
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// public members
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////////////////////////////////////////////////////////////////////////////////
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FLAC::Properties::Properties(ByteVector data, long streamLength, ReadStyle style) :
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AudioProperties(style),
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d(new PropertiesPrivate())
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{
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read(data, streamLength);
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}
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FLAC::Properties::Properties(File *, ReadStyle style) :
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AudioProperties(style),
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d(new PropertiesPrivate())
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{
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debug("FLAC::Properties::Properties() - This constructor is no longer used.");
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}
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FLAC::Properties::~Properties()
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{
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delete d;
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}
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int FLAC::Properties::length() const
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{
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return lengthInSeconds();
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}
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int FLAC::Properties::lengthInSeconds() const
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{
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return d->length / 1000;
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}
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int FLAC::Properties::lengthInMilliseconds() const
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{
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return d->length;
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}
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int FLAC::Properties::bitrate() const
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{
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return d->bitrate;
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}
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int FLAC::Properties::sampleRate() const
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{
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return d->sampleRate;
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}
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int FLAC::Properties::bitsPerSample() const
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{
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return d->bitsPerSample;
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}
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int FLAC::Properties::sampleWidth() const
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{
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return bitsPerSample();
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}
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int FLAC::Properties::channels() const
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{
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return d->channels;
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}
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unsigned long long FLAC::Properties::sampleFrames() const
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{
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return d->sampleFrames;
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}
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ByteVector FLAC::Properties::signature() const
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{
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return d->signature;
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}
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////////////////////////////////////////////////////////////////////////////////
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// private members
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////////////////////////////////////////////////////////////////////////////////
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void FLAC::Properties::read(const ByteVector &data, long streamLength)
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{
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if(data.size() < 18) {
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debug("FLAC::Properties::read() - FLAC properties must contain at least 18 bytes.");
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return;
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}
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unsigned int pos = 0;
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// Minimum block size (in samples)
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pos += 2;
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// Maximum block size (in samples)
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pos += 2;
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// Minimum frame size (in bytes)
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pos += 3;
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// Maximum frame size (in bytes)
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pos += 3;
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const unsigned int flags = data.toUInt(pos, true);
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pos += 4;
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d->sampleRate = flags >> 12;
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d->channels = ((flags >> 9) & 7) + 1;
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d->bitsPerSample = ((flags >> 4) & 31) + 1;
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// The last 4 bits are the most significant 4 bits for the 36 bit
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// stream length in samples. (Audio files measured in days)
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const unsigned long long hi = flags & 0xf;
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const unsigned long long lo = data.toUInt(pos, true);
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pos += 4;
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d->sampleFrames = (hi << 32) | lo;
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if(d->sampleFrames > 0 && d->sampleRate > 0) {
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const double length = d->sampleFrames * 1000.0 / d->sampleRate;
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d->length = static_cast<int>(length + 0.5);
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d->bitrate = static_cast<int>(streamLength * 8.0 / length + 0.5);
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}
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if(data.size() >= pos + 16)
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d->signature = data.mid(pos, 16);
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}
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