228 lines
7.1 KiB
C++
228 lines
7.1 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 "id3v2tag.h"
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#include "apeproperties.h"
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#include "apefile.h"
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#include "apetag.h"
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#include "apefooter.h"
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using namespace Strawberry_TagLib::TagLib;
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class APE::AudioProperties::AudioPropertiesPrivate {
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public:
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explicit AudioPropertiesPrivate() : 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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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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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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APE::AudioProperties::AudioProperties(File *file, long long streamLength, ReadStyle) : Strawberry_TagLib::TagLib::AudioProperties(), d(new AudioPropertiesPrivate()) {
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read(file, streamLength);
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}
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APE::AudioProperties::~AudioProperties() {
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delete d;
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}
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int APE::AudioProperties::lengthInSeconds() const {
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return d->length / 1000;
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}
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int APE::AudioProperties::lengthInMilliseconds() const {
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return d->length;
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}
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int APE::AudioProperties::bitrate() const {
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return d->bitrate;
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}
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int APE::AudioProperties::sampleRate() const {
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return d->sampleRate;
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}
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int APE::AudioProperties::channels() const {
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return d->channels;
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}
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int APE::AudioProperties::version() const {
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return d->version;
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}
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int APE::AudioProperties::bitsPerSample() const {
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return d->bitsPerSample;
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}
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unsigned int APE::AudioProperties::sampleFrames() const {
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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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int headerVersion(const ByteVector &header) {
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if (header.size() < 6 || !header.startsWith("MAC "))
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return -1;
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return header.toUInt16LE(4);
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}
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} // namespace
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void APE::AudioProperties::read(File *file, long long streamLength) {
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// First, we assume that the file pointer is set at the first descriptor.
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long long offset = file->tell();
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int version = headerVersion(file->readBlock(6));
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// Next, we look for the descriptor.
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if (version < 0) {
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offset = file->find("MAC ", offset);
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file->seek(offset);
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version = headerVersion(file->readBlock(6));
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}
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if (version < 0) {
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debug("APE::AudioProperties::read() -- APE descriptor not found");
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return;
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}
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d->version = version;
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if (d->version >= 3980)
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analyzeCurrent(file);
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else
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analyzeOld(file);
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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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void APE::AudioProperties::analyzeCurrent(File *file) {
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// Read the descriptor
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file->seek(2, File::Current);
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const ByteVector descriptor = file->readBlock(44);
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if (descriptor.size() < 44) {
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debug("APE::AudioProperties::analyzeCurrent() -- descriptor is too short.");
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return;
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}
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const unsigned int descriptorBytes = descriptor.toUInt32LE(0);
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if ((descriptorBytes - 52) > 0)
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file->seek(descriptorBytes - 52, File::Current);
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// Read the header
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const ByteVector header = file->readBlock(24);
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if (header.size() < 24) {
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debug("APE::AudioProperties::analyzeCurrent() -- MAC header is too short.");
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return;
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}
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// Get the APE info
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d->channels = header.toUInt16LE(18);
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d->sampleRate = header.toUInt32LE(20);
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d->bitsPerSample = header.toUInt16LE(16);
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const unsigned int totalFrames = header.toUInt32LE(12);
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if (totalFrames == 0)
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return;
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const unsigned int blocksPerFrame = header.toUInt32LE(4);
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const unsigned int finalFrameBlocks = header.toUInt32LE(8);
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d->sampleFrames = (totalFrames - 1) * blocksPerFrame + finalFrameBlocks;
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}
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void APE::AudioProperties::analyzeOld(File *file) {
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const ByteVector header = file->readBlock(26);
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if (header.size() < 26) {
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debug("APE::AudioProperties::analyzeOld() -- MAC header is too short.");
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return;
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}
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const unsigned int totalFrames = header.toUInt32LE(18);
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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.toUInt32LE(0);
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unsigned int 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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// Get the APE info
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d->channels = header.toUInt16LE(4);
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d->sampleRate = header.toUInt32LE(6);
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const unsigned int finalFrameBlocks = header.toUInt32LE(22);
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d->sampleFrames = (totalFrames - 1) * blocksPerFrame + finalFrameBlocks;
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// Get the bit depth from the RIFF-fmt chunk.
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file->seek(16, File::Current);
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const ByteVector fmt = file->readBlock(28);
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if (fmt.size() < 28 || !fmt.startsWith("WAVEfmt ")) {
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debug("APE::AudioProperties::analyzeOld() -- fmt header is too short.");
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return;
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}
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d->bitsPerSample = fmt.toUInt16LE(26);
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}
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