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cog/Frameworks/TagLib/taglib/taglib/mpc/mpcproperties.cpp

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/***************************************************************************
copyright : (C) 2004 by Allan Sandfeld Jensen
email : kde@carewolf.org
***************************************************************************/
/***************************************************************************
* This library is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License version *
* 2.1 as published by the Free Software Foundation. *
* *
* This library is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this library; if not, write to the Free Software *
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA *
* 02110-1301 USA *
* *
* Alternatively, this file is available under the Mozilla Public *
* License Version 1.1. You may obtain a copy of the License at *
* http://www.mozilla.org/MPL/ *
***************************************************************************/
#include <taglib/toolkit/tstring.h>
#include <taglib/toolkit/tdebug.h>
#include <bitset>
#include <math.h>
#include <taglib/mpc/mpcproperties.h>
#include <taglib/mpc/mpcfile.h>
using namespace TagLib;
class MPC::Properties::PropertiesPrivate
{
public:
PropertiesPrivate() :
version(0),
length(0),
bitrate(0),
sampleRate(0),
channels(0),
totalFrames(0),
sampleFrames(0),
trackGain(0),
trackPeak(0),
albumGain(0),
albumPeak(0) {}
int version;
int length;
int bitrate;
int sampleRate;
int channels;
unsigned int totalFrames;
unsigned int sampleFrames;
int trackGain;
int trackPeak;
int albumGain;
int albumPeak;
};
////////////////////////////////////////////////////////////////////////////////
// public members
////////////////////////////////////////////////////////////////////////////////
MPC::Properties::Properties(const ByteVector &data, long streamLength, ReadStyle style) :
AudioProperties(style),
d(new PropertiesPrivate())
{
readSV7(data, streamLength);
}
MPC::Properties::Properties(File *file, long streamLength, ReadStyle style) :
AudioProperties(style),
d(new PropertiesPrivate())
{
ByteVector magic = file->readBlock(4);
if(magic == "MPCK") {
// Musepack version 8
readSV8(file, streamLength);
}
else {
// Musepack version 7 or older, fixed size header
readSV7(magic + file->readBlock(MPC::HeaderSize - 4), streamLength);
}
}
MPC::Properties::~Properties()
{
delete d;
}
int MPC::Properties::length() const
{
return lengthInSeconds();
}
int MPC::Properties::lengthInSeconds() const
{
return d->length / 1000;
}
int MPC::Properties::lengthInMilliseconds() const
{
return d->length;
}
int MPC::Properties::bitrate() const
{
return d->bitrate;
}
int MPC::Properties::sampleRate() const
{
return d->sampleRate;
}
int MPC::Properties::channels() const
{
return d->channels;
}
int MPC::Properties::mpcVersion() const
{
return d->version;
}
unsigned int MPC::Properties::totalFrames() const
{
return d->totalFrames;
}
unsigned int MPC::Properties::sampleFrames() const
{
return d->sampleFrames;
}
int MPC::Properties::trackGain() const
{
return d->trackGain;
}
int MPC::Properties::trackPeak() const
{
return d->trackPeak;
}
int MPC::Properties::albumGain() const
{
return d->albumGain;
}
int MPC::Properties::albumPeak() const
{
return d->albumPeak;
}
////////////////////////////////////////////////////////////////////////////////
// private members
////////////////////////////////////////////////////////////////////////////////
namespace
{
unsigned long readSize(File *file, unsigned int &sizeLength, bool &eof)
{
sizeLength = 0;
eof = false;
unsigned char tmp;
unsigned long size = 0;
do {
const ByteVector b = file->readBlock(1);
if(b.isEmpty()) {
eof = true;
break;
}
tmp = b[0];
size = (size << 7) | (tmp & 0x7F);
sizeLength++;
} while((tmp & 0x80));
return size;
}
unsigned long readSize(const ByteVector &data, unsigned int &pos)
{
unsigned char tmp;
unsigned long size = 0;
do {
tmp = data[pos++];
size = (size << 7) | (tmp & 0x7F);
} while((tmp & 0x80) && (pos < data.size()));
return size;
}
// This array looks weird, but the same as original MusePack code found at:
// https://www.musepack.net/index.php?pg=src
const unsigned short sftable [8] = { 44100, 48000, 37800, 32000, 0, 0, 0, 0 };
}
void MPC::Properties::readSV8(File *file, long streamLength)
{
bool readSH = false, readRG = false;
while(!readSH && !readRG) {
const ByteVector packetType = file->readBlock(2);
unsigned int packetSizeLength;
bool eof;
const unsigned long packetSize = readSize(file, packetSizeLength, eof);
if(eof) {
debug("MPC::Properties::readSV8() - Reached to EOF.");
break;
}
const unsigned long dataSize = packetSize - 2 - packetSizeLength;
const ByteVector data = file->readBlock(dataSize);
if(data.size() != dataSize) {
debug("MPC::Properties::readSV8() - dataSize doesn't match the actual data size.");
break;
}
if(packetType == "SH") {
// Stream Header
// http://trac.musepack.net/wiki/SV8Specification#StreamHeaderPacket
if(dataSize <= 5) {
debug("MPC::Properties::readSV8() - \"SH\" packet is too short to parse.");
break;
}
readSH = true;
unsigned int pos = 4;
d->version = data[pos];
pos += 1;
d->sampleFrames = readSize(data, pos);
if(pos > dataSize - 3) {
debug("MPC::Properties::readSV8() - \"SH\" packet is corrupt.");
break;
}
const unsigned long begSilence = readSize(data, pos);
if(pos > dataSize - 2) {
debug("MPC::Properties::readSV8() - \"SH\" packet is corrupt.");
break;
}
const unsigned short flags = data.toUShort(pos, true);
pos += 2;
d->sampleRate = sftable[(flags >> 13) & 0x07];
d->channels = ((flags >> 4) & 0x0F) + 1;
const unsigned int frameCount = d->sampleFrames - begSilence;
if(frameCount > 0 && d->sampleRate > 0) {
const double length = frameCount * 1000.0 / d->sampleRate;
d->length = static_cast<int>(length + 0.5);
d->bitrate = static_cast<int>(streamLength * 8.0 / length + 0.5);
}
}
else if (packetType == "RG") {
// Replay Gain
// http://trac.musepack.net/wiki/SV8Specification#ReplaygainPacket
if(dataSize <= 9) {
debug("MPC::Properties::readSV8() - \"RG\" packet is too short to parse.");
break;
}
readRG = true;
const int replayGainVersion = data[0];
if(replayGainVersion == 1) {
d->trackGain = data.toShort(1, true);
d->trackPeak = data.toShort(3, true);
d->albumGain = data.toShort(5, true);
d->albumPeak = data.toShort(7, true);
}
}
else if(packetType == "SE") {
break;
}
else {
file->seek(dataSize, File::Current);
}
}
}
void MPC::Properties::readSV7(const ByteVector &data, long streamLength)
{
if(data.startsWith("MP+")) {
d->version = data[3] & 15;
if(d->version < 7)
return;
d->totalFrames = data.toUInt(4, false);
const unsigned int flags = data.toUInt(8, false);
d->sampleRate = sftable[(flags >> 16) & 0x03];
d->channels = 2;
const unsigned int gapless = data.toUInt(5, false);
d->trackGain = data.toShort(14, false);
d->trackPeak = data.toUShort(12, false);
d->albumGain = data.toShort(18, false);
d->albumPeak = data.toUShort(16, false);
// convert gain info
if(d->trackGain != 0) {
int tmp = (int)((64.82 - (short)d->trackGain / 100.) * 256. + .5);
if(tmp >= (1 << 16) || tmp < 0) tmp = 0;
d->trackGain = tmp;
}
if(d->albumGain != 0) {
int tmp = (int)((64.82 - d->albumGain / 100.) * 256. + .5);
if(tmp >= (1 << 16) || tmp < 0) tmp = 0;
d->albumGain = tmp;
}
if (d->trackPeak != 0)
d->trackPeak = (int)(log10((double)d->trackPeak) * 20 * 256 + .5);
if (d->albumPeak != 0)
d->albumPeak = (int)(log10((double)d->albumPeak) * 20 * 256 + .5);
bool trueGapless = (gapless >> 31) & 0x0001;
if(trueGapless) {
unsigned int lastFrameSamples = (gapless >> 20) & 0x07FF;
d->sampleFrames = d->totalFrames * 1152 - lastFrameSamples;
}
else
d->sampleFrames = d->totalFrames * 1152 - 576;
}
else {
const unsigned int headerData = data.toUInt(0, false);
d->bitrate = (headerData >> 23) & 0x01ff;
d->version = (headerData >> 11) & 0x03ff;
d->sampleRate = 44100;
d->channels = 2;
if(d->version >= 5)
d->totalFrames = data.toUInt(4, false);
else
d->totalFrames = data.toUShort(6, false);
d->sampleFrames = d->totalFrames * 1152 - 576;
}
if(d->sampleFrames > 0 && d->sampleRate > 0) {
const double length = d->sampleFrames * 1000.0 / d->sampleRate;
d->length = static_cast<int>(length + 0.5);
if(d->bitrate == 0)
d->bitrate = static_cast<int>(streamLength * 8.0 / length + 0.5);
}
}
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