237 lines
6.5 KiB
C++
237 lines
6.5 KiB
C++
/***************************************************************************
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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, 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 "wavpackproperties.h"
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#include "wavpackfile.h"
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// Implementation of this class is based on the information at:
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// http://www.wavpack.com/file_format.txt
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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() :
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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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lossless(false),
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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 channels;
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int version;
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int bitsPerSample;
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bool lossless;
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unsigned int sampleFrames;
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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 &, long, ReadStyle style) :
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AudioProperties(style),
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d(new PropertiesPrivate())
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{
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debug("WavPack::Properties::Properties() -- This constructor is no longer used.");
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}
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WavPack::Properties::Properties(File *file, 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(file, streamLength);
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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 lengthInSeconds();
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}
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int WavPack::Properties::lengthInSeconds() const
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{
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return d->length / 1000;
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}
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int WavPack::Properties::lengthInMilliseconds() 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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bool WavPack::Properties::isLossless() const
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{
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return d->lossless;
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}
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unsigned int WavPack::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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namespace
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{
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const unsigned int sample_rates[] = {
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6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000,
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32000, 44100, 48000, 64000, 88200, 96000, 192000, 0 };
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}
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#define BYTES_STORED 3
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#define MONO_FLAG 4
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#define LOSSLESS_FLAG 8
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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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#define MIN_STREAM_VERS 0x402
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#define MAX_STREAM_VERS 0x410
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#define FINAL_BLOCK 0x1000
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void WavPack::Properties::read(File *file, long streamLength)
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{
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long offset = 0;
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while(true) {
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file->seek(offset);
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const ByteVector data = file->readBlock(32);
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if(data.size() < 32) {
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debug("WavPack::Properties::read() -- data is too short.");
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break;
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}
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if(!data.startsWith("wvpk")) {
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debug("WavPack::Properties::read() -- Block header not found.");
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break;
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}
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const unsigned int flags = data.toUInt(24, false);
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if(offset == 0) {
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d->version = data.toShort(8, false);
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if(d->version < MIN_STREAM_VERS || d->version > MAX_STREAM_VERS)
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break;
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d->bitsPerSample = ((flags & BYTES_STORED) + 1) * 8 - ((flags & SHIFT_MASK) >> SHIFT_LSB);
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d->sampleRate = sample_rates[(flags & SRATE_MASK) >> SRATE_LSB];
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d->lossless = !(flags & LOSSLESS_FLAG);
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d->sampleFrames = data.toUInt(12, false);
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}
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d->channels += (flags & MONO_FLAG) ? 1 : 2;
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if(flags & FINAL_BLOCK)
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break;
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const unsigned int blockSize = data.toUInt(4, false);
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offset += blockSize + 8;
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}
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if(d->sampleFrames == ~0u)
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d->sampleFrames = seekFinalIndex(file, streamLength);
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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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}
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unsigned int WavPack::Properties::seekFinalIndex(File *file, long streamLength)
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{
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const long offset = file->rfind("wvpk", streamLength);
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if(offset == -1)
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return 0;
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file->seek(offset);
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const ByteVector data = file->readBlock(32);
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if(data.size() < 32)
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return 0;
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const int version = data.toShort(8, false);
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if(version < MIN_STREAM_VERS || version > MAX_STREAM_VERS)
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return 0;
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const unsigned int flags = data.toUInt(24, false);
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if(!(flags & FINAL_BLOCK))
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return 0;
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const unsigned int blockIndex = data.toUInt(16, false);
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const unsigned int blockSamples = data.toUInt(20, false);
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return blockIndex + blockSamples;
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}
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