233 lines
6.5 KiB
C++
233 lines
6.5 KiB
C++
/***************************************************************************
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copyright : (C) 2010 by Alex Novichkov
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email : novichko@atnet.ru
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copyright : (C) 2006 by Lukáš Lalinský
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email : lalinsky@gmail.com
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(original WavPack 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 <bitset>
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#include "id3v2tag.h"
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#include "apeproperties.h"
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#include "apefile.h"
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using namespace TagLib;
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class APE::Properties::PropertiesPrivate
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{
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public:
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PropertiesPrivate(File *file, long streamLength) :
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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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sampleFrames(0),
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file(file),
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streamLength(streamLength) {}
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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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uint sampleFrames;
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File *file;
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long streamLength;
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};
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////////////////////////////////////////////////////////////////////////////////
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// public members
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////////////////////////////////////////////////////////////////////////////////
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APE::Properties::Properties(File *file, ReadStyle style) : AudioProperties(style)
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{
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d = new PropertiesPrivate(file, file->length());
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read();
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}
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APE::Properties::~Properties()
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{
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delete d;
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}
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int APE::Properties::length() const
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{
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return d->length;
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}
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int APE::Properties::bitrate() const
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{
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return d->bitrate;
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}
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int APE::Properties::sampleRate() const
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{
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return d->sampleRate;
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}
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int APE::Properties::channels() const
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{
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return d->channels;
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}
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int APE::Properties::version() const
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{
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return d->version;
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}
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int APE::Properties::bitsPerSample() const
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{
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return d->bitsPerSample;
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}
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TagLib::uint APE::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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void APE::Properties::read()
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{
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// First we are searching the descriptor
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long offset = findDescriptor();
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if(offset < 0)
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return;
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// Then we read the header common for all versions of APE
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d->file->seek(offset);
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ByteVector commonHeader = d->file->readBlock(6);
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if(!commonHeader.startsWith("MAC "))
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return;
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d->version = commonHeader.toUShort(4, false);
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if(d->version >= 3980) {
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analyzeCurrent();
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}
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else {
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analyzeOld();
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}
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}
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long APE::Properties::findDescriptor()
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{
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long ID3v2Location = findID3v2();
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long ID3v2OriginalSize = 0;
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bool hasID3v2 = false;
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if(ID3v2Location >= 0) {
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ID3v2::Tag tag(d->file, ID3v2Location);
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ID3v2OriginalSize = tag.header()->completeTagSize();
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if(tag.header()->tagSize() > 0)
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hasID3v2 = true;
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}
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long offset = 0;
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if(hasID3v2)
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offset = d->file->find("MAC ", ID3v2Location + ID3v2OriginalSize);
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else
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offset = d->file->find("MAC ");
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if(offset < 0) {
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debug("APE::Properties::findDescriptor() -- APE descriptor not found");
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return -1;
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}
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return offset;
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}
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long APE::Properties::findID3v2()
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{
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if(!d->file->isValid())
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return -1;
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d->file->seek(0);
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if(d->file->readBlock(3) == ID3v2::Header::fileIdentifier())
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return 0;
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return -1;
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}
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void APE::Properties::analyzeCurrent()
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{
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// Read the descriptor
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d->file->seek(2, File::Current);
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ByteVector descriptor = d->file->readBlock(44);
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const uint descriptorBytes = descriptor.toUInt(0, false);
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if ((descriptorBytes - 52) > 0)
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d->file->seek(descriptorBytes - 52, File::Current);
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// Read the header
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ByteVector header = d->file->readBlock(24);
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// Get the APE info
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d->channels = header.toShort(18, false);
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d->sampleRate = header.toUInt(20, false);
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d->bitsPerSample = header.toShort(16, false);
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//d->compressionLevel =
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const uint totalFrames = header.toUInt(12, false);
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const uint blocksPerFrame = header.toUInt(4, false);
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const uint finalFrameBlocks = header.toUInt(8, false);
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d->sampleFrames = totalFrames > 0 ? (totalFrames - 1) * blocksPerFrame + finalFrameBlocks : 0;
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d->length = d->sampleRate > 0 ? d->sampleFrames / 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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void APE::Properties::analyzeOld()
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{
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ByteVector header = d->file->readBlock(26);
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const uint totalFrames = header.toUInt(18, false);
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// Fail on 0 length APE files (catches non-finalized APE files)
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if(totalFrames == 0)
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return;
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const short compressionLevel = header.toShort(0, false);
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uint blocksPerFrame;
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if(d->version >= 3950)
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blocksPerFrame = 73728 * 4;
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else if(d->version >= 3900 || (d->version >= 3800 && compressionLevel == 4000))
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blocksPerFrame = 73728;
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else
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blocksPerFrame = 9216;
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d->channels = header.toShort(4, false);
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d->sampleRate = header.toUInt(6, false);
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const uint finalFrameBlocks = header.toUInt(22, false);
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const uint totalBlocks
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= totalFrames > 0 ? (totalFrames - 1) * blocksPerFrame + finalFrameBlocks : 0;
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d->length = totalBlocks / d->sampleRate;
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d->bitrate = d->length > 0 ? ((d->streamLength * 8L) / d->length) / 1000 : 0;
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}
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