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Clementine-audio-player-Mac.../3rdparty/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 <tstring.h>
#include <tdebug.h>
#include <bitset>
#include <math.h>
#include "mpcproperties.h"
#include "mpcfile.h"
using namespace TagLib;
class MPC::Properties::PropertiesPrivate
{
public:
PropertiesPrivate(long length, ReadStyle s) :
streamLength(length),
style(s),
version(0),
length(0),
bitrate(0),
sampleRate(0),
channels(0),
totalFrames(0),
sampleFrames(0),
trackGain(0),
trackPeak(0),
albumGain(0),
albumPeak(0) {}
long streamLength;
ReadStyle style;
int version;
int length;
int bitrate;
int sampleRate;
int channels;
uint totalFrames;
uint sampleFrames;
uint trackGain;
uint trackPeak;
uint albumGain;
uint albumPeak;
String flags;
};
////////////////////////////////////////////////////////////////////////////////
// public members
////////////////////////////////////////////////////////////////////////////////
MPC::Properties::Properties(const ByteVector &data, long streamLength, ReadStyle style) : AudioProperties(style)
{
d = new PropertiesPrivate(streamLength, style);
readSV7(data);
}
MPC::Properties::Properties(File *file, long streamLength, ReadStyle style) : AudioProperties(style)
{
d = new PropertiesPrivate(streamLength, style);
ByteVector magic = file->readBlock(4);
if(magic == "MPCK") {
// Musepack version 8
readSV8(file);
}
else {
// Musepack version 7 or older, fixed size header
readSV7(magic + file->readBlock(MPC::HeaderSize - 4));
}
}
MPC::Properties::~Properties()
{
delete d;
}
int MPC::Properties::length() 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;
}
TagLib::uint MPC::Properties::totalFrames() const
{
return d->totalFrames;
}
TagLib::uint 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
////////////////////////////////////////////////////////////////////////////////
unsigned long readSize(File *file, TagLib::uint &sizelength)
{
unsigned char tmp;
unsigned long size = 0;
do {
ByteVector b = file->readBlock(1);
tmp = b[0];
size = (size << 7) | (tmp & 0x7F);
sizelength++;
} while((tmp & 0x80));
return size;
}
unsigned long readSize(const ByteVector &data, TagLib::uint &sizelength)
{
unsigned char tmp;
unsigned long size = 0;
unsigned long pos = 0;
do {
tmp = data[pos++];
size = (size << 7) | (tmp & 0x7F);
sizelength++;
} while((tmp & 0x80) && (pos < data.size()));
return size;
}
static const unsigned short sftable [4] = { 44100, 48000, 37800, 32000 };
void MPC::Properties::readSV8(File *file)
{
bool readSH = false, readRG = false;
while(!readSH && !readRG) {
ByteVector packetType = file->readBlock(2);
uint packetSizeLength = 0;
unsigned long packetSize = readSize(file, packetSizeLength);
unsigned long dataSize = packetSize - 2 - packetSizeLength;
if(packetType == "SH") {
// Stream Header
// http://trac.musepack.net/wiki/SV8Specification#StreamHeaderPacket
ByteVector data = file->readBlock(dataSize);
readSH = true;
TagLib::uint pos = 4;
d->version = data[pos];
pos += 1;
d->sampleFrames = readSize(data.mid(pos), pos);
ulong begSilence = readSize(data.mid(pos), pos);
std::bitset<16> flags(TAGLIB_CONSTRUCT_BITSET(data.mid(pos, 2).toUShort(true)));
pos += 2;
d->sampleRate = sftable[flags[15] * 4 + flags[14] * 2 + flags[13]];
d->channels = flags[7] * 8 + flags[6] * 4 + flags[5] * 2 + flags[4] + 1;
if((d->sampleFrames - begSilence) != 0)
d->bitrate = (int)(d->streamLength * 8.0 * d->sampleRate / (d->sampleFrames - begSilence));
d->bitrate = d->bitrate / 1000;
d->length = (d->sampleFrames - begSilence) / d->sampleRate;
}
else if (packetType == "RG") {
// Replay Gain
// http://trac.musepack.net/wiki/SV8Specification#ReplaygainPacket
ByteVector data = file->readBlock(dataSize);
readRG = true;
int replayGainVersion = data[0];
if(replayGainVersion == 1) {
d->trackGain = data.mid(1, 2).toUInt(true);
d->trackPeak = data.mid(3, 2).toUInt(true);
d->albumGain = data.mid(5, 2).toUInt(true);
d->albumPeak = data.mid(7, 2).toUInt(true);
}
}
else if(packetType == "SE") {
break;
}
else {
file->seek(dataSize, File::Current);
}
}
}
void MPC::Properties::readSV7(const ByteVector &data)
{
if(data.startsWith("MP+")) {
d->version = data[3] & 15;
if(d->version < 7)
return;
d->totalFrames = data.mid(4, 4).toUInt(false);
std::bitset<32> flags(TAGLIB_CONSTRUCT_BITSET(data.mid(8, 4).toUInt(false)));
d->sampleRate = sftable[flags[17] * 2 + flags[16]];
d->channels = 2;
uint gapless = data.mid(5, 4).toUInt(false);
d->trackGain = data.mid(14,2).toShort(false);
d->trackPeak = data.mid(12,2).toUInt(false);
d->albumGain = data.mid(18,2).toShort(false);
d->albumPeak = data.mid(16,2).toUInt(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) {
uint lastFrameSamples = (gapless >> 20) & 0x07FF;
d->sampleFrames = d->totalFrames * 1152 - lastFrameSamples;
}
else
d->sampleFrames = d->totalFrames * 1152 - 576;
}
else {
uint headerData = data.mid(0, 4).toUInt(false);
d->bitrate = (headerData >> 23) & 0x01ff;
d->version = (headerData >> 11) & 0x03ff;
d->sampleRate = 44100;
d->channels = 2;
if(d->version >= 5)
d->totalFrames = data.mid(4, 4).toUInt(false);
else
d->totalFrames = data.mid(6, 2).toUInt(false);
d->sampleFrames = d->totalFrames * 1152 - 576;
}
d->length = d->sampleRate > 0 ? (d->sampleFrames + (d->sampleRate / 2)) / d->sampleRate : 0;
if(!d->bitrate)
d->bitrate = d->length > 0 ? ((d->streamLength * 8L) / d->length) / 1000 : 0;
}
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