170 lines
4.6 KiB
C++
170 lines
4.6 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(ByteVector d, long st, ReadStyle s) :
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data(d),
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streamLength(st),
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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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sampleWidth(0),
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channels(0),
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sampleFrames(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 sampleWidth;
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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) : 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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FLAC::Properties::Properties(File *file, ReadStyle style) : AudioProperties(style)
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{
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d = new PropertiesPrivate(file->streamInfoData(), file->streamLength(), style);
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read();
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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 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::sampleWidth() const
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{
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return d->sampleWidth;
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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()
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{
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if(d->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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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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uint flags = d->data.mid(pos, 4).toUInt(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->sampleWidth = ((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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unsigned long long hi = flags & 0xf;
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unsigned long long lo = d->data.mid(pos, 4).toUInt(true);
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pos += 4;
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d->sampleFrames = (hi << 32) | lo;
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if(d->sampleRate > 0)
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d->length = int(d->sampleFrames / d->sampleRate);
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// Uncompressed bitrate:
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//d->bitrate = ((d->sampleRate * d->channels) / 1000) * d->sampleWidth;
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// Real bitrate:
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d->bitrate = d->length > 0 ? ((d->streamLength * 8UL) / d->length) / 1000 : 0;
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d->signature = d->data.mid(pos, 32);
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}
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