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Cell.cxx
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359 lines (320 loc) · 10.9 KB
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// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
// This software is distributed under the terms of the GNU General Public
// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
//
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
#include "DataFormatsEMCAL/Constants.h"
#include "DataFormatsEMCAL/Cell.h"
#include <iostream>
#include <bitset>
#include <cmath>
using namespace o2::emcal;
namespace TimeEncoding
{
const float TIME_SHIFT = 600.,
TIME_RANGE = 1500.,
TIME_RESOLUTION = TIME_RANGE / 2047.;
}
namespace EnergyEncoding
{
namespace v0
{
const float
ENERGY_TRUNCATION = 250.,
ENERGY_RESOLUTION = ENERGY_TRUNCATION / 16383.;
}
namespace v1
{
const float
ENERGY_BITS = static_cast<float>(0x3FFF),
HGLGTRANSITION = o2::emcal::constants::EMCAL_HGLGTRANSITION * o2::emcal::constants::EMCAL_ADCENERGY,
ENERGY_TRUNCATION = 250.,
ENERGY_RESOLUTION_LG = (ENERGY_TRUNCATION - HGLGTRANSITION) / ENERGY_BITS,
ENERGY_RESOLUTION_HG = HGLGTRANSITION / ENERGY_BITS,
ENERGY_RESOLUTION_TRU = ENERGY_TRUNCATION / ENERGY_BITS,
ENERGY_RESOLUTION_LEDMON = ENERGY_TRUNCATION / ENERGY_BITS;
}
namespace v2
{
const float
ENERGY_BITS = static_cast<float>(0x3FFF),
SAFETYMARGIN = 0.2,
HGLGTRANSITION = o2::emcal::constants::OVERFLOWCUT * o2::emcal::constants::EMCAL_ADCENERGY,
OFFSET_LG = HGLGTRANSITION - SAFETYMARGIN,
ENERGY_TRUNCATION = 250.,
ENERGY_RESOLUTION_LG = (ENERGY_TRUNCATION - OFFSET_LG) / ENERGY_BITS,
ENERGY_RESOLUTION_HG = HGLGTRANSITION / ENERGY_BITS,
ENERGY_RESOLUTION_TRU = ENERGY_TRUNCATION / ENERGY_BITS,
ENERGY_RESOLUTION_LEDMON = ENERGY_TRUNCATION / ENERGY_BITS;
}
} // namespace EnergyEncoding
namespace DecodingV0
{
struct __attribute__((packed)) CellDataPacked {
uint16_t mTowerID : 15; ///< bits 0-14 Tower ID
uint16_t mTime : 11; ///< bits 15-25: Time (signed, can become negative after calibration)
uint16_t mEnergy : 14; ///< bits 26-39: Energy
uint16_t mCellStatus : 2; ///< bits 40-41: Cell status
uint16_t mZerod : 6; ///< bits 42-47: Zerod
};
} // namespace DecodingV0
Cell::Cell(short tower, float energy, float timestamp, ChannelType_t ctype) : mTowerID(tower), mEnergy(energy), mTimestamp(timestamp), mChannelType(ctype)
{
}
Cell::Cell(uint16_t towerBits, uint16_t energyBits, uint16_t timestampBits, uint16_t channelBits, EncoderVersion version)
{
initialiseFromEncoded(towerBits, timestampBits, energyBits, channelBits, version);
}
uint16_t Cell::getTowerIDEncoded() const
{
return mTowerID;
}
uint16_t Cell::getTimeStampEncoded() const
{
return encodeTime(mTimestamp);
}
uint16_t Cell::getEnergyEncoded(EncoderVersion version) const
{
uint16_t energyBits = 0;
switch (version) {
case EncoderVersion::EncodingV0:
energyBits = encodeEnergyV0(mEnergy);
break;
case EncoderVersion::EncodingV1:
energyBits = encodeEnergyV1(mEnergy, mChannelType);
break;
case EncoderVersion::EncodingV2:
energyBits = encodeEnergyV2(mEnergy, mChannelType);
break;
}
return energyBits;
}
uint16_t Cell::getCellTypeEncoded() const
{
return static_cast<uint16_t>(mChannelType);
}
void Cell::setEnergyEncoded(uint16_t energyBits, uint16_t channelTypeBits, EncoderVersion version)
{
switch (version) {
case EncoderVersion::EncodingV0:
mEnergy = decodeEnergyV0(energyBits);
break;
case EncoderVersion::EncodingV1:
mEnergy = decodeEnergyV1(energyBits, static_cast<ChannelType_t>(channelTypeBits));
break;
case EncoderVersion::EncodingV2:
mEnergy = decodeEnergyV2(energyBits, static_cast<ChannelType_t>(channelTypeBits));
break;
}
}
void Cell::setTimestampEncoded(uint16_t timestampBits)
{
mTimestamp = decodeTime(timestampBits);
}
void Cell::setTowerIDEncoded(uint16_t towerIDBits)
{
mTowerID = towerIDBits;
}
void Cell::setChannelTypeEncoded(uint16_t channelTypeBits)
{
mChannelType = static_cast<ChannelType_t>(channelTypeBits);
}
void Cell::initializeFromPackedBitfieldV0(const char* bitfield)
{
auto bitrepresentation = reinterpret_cast<const DecodingV0::CellDataPacked*>(bitfield);
mEnergy = decodeEnergyV0(bitrepresentation->mEnergy);
mTimestamp = decodeTime(bitrepresentation->mTime);
mTowerID = bitrepresentation->mTowerID;
mChannelType = static_cast<ChannelType_t>(bitrepresentation->mCellStatus);
}
float Cell::getEnergyFromPackedBitfieldV0(const char* bitfield)
{
return decodeEnergyV0(reinterpret_cast<const DecodingV0::CellDataPacked*>(bitfield)->mEnergy);
}
float Cell::getTimeFromPackedBitfieldV0(const char* bitfield)
{
return decodeTime(reinterpret_cast<const DecodingV0::CellDataPacked*>(bitfield)->mTime);
}
ChannelType_t Cell::getCellTypeFromPackedBitfieldV0(const char* bitfield)
{
return static_cast<ChannelType_t>(reinterpret_cast<const DecodingV0::CellDataPacked*>(bitfield)->mCellStatus);
}
short Cell::getTowerFromPackedBitfieldV0(const char* bitfield)
{
return reinterpret_cast<const DecodingV0::CellDataPacked*>(bitfield)->mTowerID;
}
void Cell::truncate(EncoderVersion version)
{
setEnergyEncoded(getEnergyEncoded(version), getCellTypeEncoded(), version);
setTimestampEncoded(getTimeStampEncoded());
}
uint16_t Cell::encodeTime(float timestamp)
{
// truncate
auto timestampTruncated = timestamp;
const float TIME_MIN = -1. * TimeEncoding::TIME_SHIFT,
TIME_MAX = TimeEncoding::TIME_RANGE - TimeEncoding::TIME_SHIFT;
if (timestampTruncated < TIME_MIN) {
timestampTruncated = TIME_MIN;
} else if (timestampTruncated > TIME_MAX) {
timestampTruncated = TIME_MAX;
}
return static_cast<uint16_t>(std::round((timestampTruncated + TimeEncoding::TIME_SHIFT) / TimeEncoding::TIME_RESOLUTION));
}
uint16_t Cell::encodeEnergyV0(float energy)
{
auto truncatedEnergy = energy;
if (truncatedEnergy < 0.) {
truncatedEnergy = 0.;
} else if (truncatedEnergy > EnergyEncoding::v0::ENERGY_TRUNCATION) {
truncatedEnergy = EnergyEncoding::v0::ENERGY_TRUNCATION;
}
return static_cast<uint16_t>(std::round(truncatedEnergy / EnergyEncoding::v0::ENERGY_RESOLUTION));
}
uint16_t Cell::encodeEnergyV1(float energy, ChannelType_t celltype)
{
double truncatedEnergy = energy;
if (truncatedEnergy < 0.) {
truncatedEnergy = 0.;
} else if (truncatedEnergy > EnergyEncoding::v1::ENERGY_TRUNCATION) {
truncatedEnergy = EnergyEncoding::v1::ENERGY_TRUNCATION;
}
float resolutionApplied = 0., energyOffset = 0.;
switch (celltype) {
case ChannelType_t::HIGH_GAIN: {
resolutionApplied = EnergyEncoding::v1::ENERGY_RESOLUTION_HG;
break;
}
case ChannelType_t::LOW_GAIN: {
resolutionApplied = EnergyEncoding::v1::ENERGY_RESOLUTION_LG;
energyOffset = EnergyEncoding::v1::HGLGTRANSITION;
break;
}
case ChannelType_t::TRU: {
resolutionApplied = EnergyEncoding::v1::ENERGY_RESOLUTION_TRU;
break;
}
case ChannelType_t::LEDMON: {
resolutionApplied = EnergyEncoding::v1::ENERGY_RESOLUTION_LEDMON;
break;
}
}
return static_cast<uint16_t>(std::round((truncatedEnergy - energyOffset) / resolutionApplied));
};
uint16_t Cell::encodeEnergyV2(float energy, ChannelType_t celltype)
{
double truncatedEnergy = energy;
if (truncatedEnergy < 0.) {
truncatedEnergy = 0.;
} else if (truncatedEnergy > EnergyEncoding::v2::ENERGY_TRUNCATION) {
truncatedEnergy = EnergyEncoding::v2::ENERGY_TRUNCATION;
}
float resolutionApplied = 0., energyOffset = 0.;
switch (celltype) {
case ChannelType_t::HIGH_GAIN: {
resolutionApplied = EnergyEncoding::v2::ENERGY_RESOLUTION_HG;
break;
}
case ChannelType_t::LOW_GAIN: {
resolutionApplied = EnergyEncoding::v2::ENERGY_RESOLUTION_LG;
energyOffset = EnergyEncoding::v2::OFFSET_LG;
break;
}
case ChannelType_t::TRU: {
resolutionApplied = EnergyEncoding::v2::ENERGY_RESOLUTION_TRU;
break;
}
case ChannelType_t::LEDMON: {
resolutionApplied = EnergyEncoding::v2::ENERGY_RESOLUTION_LEDMON;
break;
}
}
return static_cast<uint16_t>(std::round((truncatedEnergy - energyOffset) / resolutionApplied));
};
uint16_t Cell::V0toV1(uint16_t energyBits, ChannelType_t celltype)
{
auto decodedEnergy = decodeEnergyV0(energyBits);
return encodeEnergyV1(decodedEnergy, celltype);
}
uint16_t Cell::V0toV2(uint16_t energyBits, ChannelType_t celltype)
{
auto decodedEnergy = decodeEnergyV0(energyBits);
return encodeEnergyV2(decodedEnergy, celltype);
}
uint16_t Cell::V1toV2(uint16_t energyBits, ChannelType_t celltype)
{
auto decodedEnergy = decodeEnergyV1(energyBits, celltype);
return encodeEnergyV2(decodedEnergy, celltype);
}
float Cell::decodeTime(uint16_t timestampBits)
{
return (static_cast<float>(timestampBits) * TimeEncoding::TIME_RESOLUTION) - TimeEncoding::TIME_SHIFT;
}
float Cell::decodeEnergyV0(uint16_t energyBits)
{
return static_cast<float>(energyBits) * EnergyEncoding::v0::ENERGY_RESOLUTION;
}
float Cell::decodeEnergyV1(uint16_t energyBits, ChannelType_t celltype)
{
float resolutionApplied = 0.,
energyOffset = 0.;
switch (celltype) {
case ChannelType_t::HIGH_GAIN: {
resolutionApplied = EnergyEncoding::v1::ENERGY_RESOLUTION_HG;
break;
}
case ChannelType_t::LOW_GAIN: {
resolutionApplied = EnergyEncoding::v1::ENERGY_RESOLUTION_LG;
energyOffset = EnergyEncoding::v1::HGLGTRANSITION;
break;
}
case ChannelType_t::TRU: {
resolutionApplied = EnergyEncoding::v1::ENERGY_RESOLUTION_TRU;
break;
}
case ChannelType_t::LEDMON: {
resolutionApplied = EnergyEncoding::v1::ENERGY_RESOLUTION_LEDMON;
break;
}
}
return (static_cast<float>(energyBits) * resolutionApplied) + energyOffset;
}
float Cell::decodeEnergyV2(uint16_t energyBits, ChannelType_t celltype)
{
float resolutionApplied = 0.,
energyOffset = 0.;
switch (celltype) {
case ChannelType_t::HIGH_GAIN: {
resolutionApplied = EnergyEncoding::v2::ENERGY_RESOLUTION_HG;
break;
}
case ChannelType_t::LOW_GAIN: {
resolutionApplied = EnergyEncoding::v2::ENERGY_RESOLUTION_LG;
energyOffset = EnergyEncoding::v2::OFFSET_LG;
break;
}
case ChannelType_t::TRU: {
resolutionApplied = EnergyEncoding::v2::ENERGY_RESOLUTION_TRU;
break;
}
case ChannelType_t::LEDMON: {
resolutionApplied = EnergyEncoding::v2::ENERGY_RESOLUTION_LEDMON;
break;
}
}
return (static_cast<float>(energyBits) * resolutionApplied) + energyOffset;
}
void Cell::PrintStream(std::ostream& stream) const
{
stream << "EMCAL Cell: Type " << getType() << ", Energy " << getEnergy() << ", Time " << getTimeStamp() << ", Tower " << getTower();
}
std::ostream& o2::emcal::operator<<(std::ostream& stream, const Cell& c)
{
c.PrintStream(stream);
return stream;
}