ECLDeltaCompress Class Reference

ECL waveform compression/decompression to/from the BitStream storage with the DELTA algorithm. More...

#include <ECLCompress.h>

Inheritance diagram for ECLDeltaCompress:

Public Member Functions
void	compress (BitStream &out, const int *adc) override
	function to compress the ECL waveform with the DELTA algorithm
void	uncompress (BitStream &out, int *adc) override
	function to decompress the ECL waveform with the DELTA algorithm

Detailed Description

ECL waveform compression/decompression to/from the BitStream storage with the DELTA algorithm.

Definition at line 69 of file ECLCompress.h.

Member Function Documentation

compress()

void compress ( BitStream &  out, const int *  adc  )

overridevirtual

function to compress the ECL waveform with the DELTA algorithm

Implements ECLCompress.

Definition at line 62 of file ECLCompress.cc.

{
  int a0 = adc[0], dmin = 0, dmax = 0;
  for (int k = 1; k < EclConfiguration::m_nsmp; k++) {
    int d = adc[k] - a0;
    dmin = std::min(dmin, d);
    dmax = std::max(dmax, d);
    a0 = adc[k];
  }
 
  unsigned int w = ilog2(std::max(2 * dmax, -2 * dmin)) + 1;
  w &= 0xf;
  out.putNBits(w, 4);
 
  a0 = adc[0] & 0x3ffff;
  out.putNBits(a0, 18);
 
  unsigned int base = 1 << (w - 1);
  for (unsigned int i = 1; i < EclConfiguration::m_nsmp; i++) {
    unsigned int d = int(adc[i]) - a0 + base;
    out.putNBits(d, w);
    a0 = adc[i];
  }
}

uncompress()

void uncompress ( BitStream &  out, int *  adc  )

overridevirtual

function to decompress the ECL waveform with the DELTA algorithm

Implements ECLCompress.

Definition at line 87 of file ECLCompress.cc.

{
  unsigned int w = out.getNBits(4);
  adc[0] = out.getNBits(18);
  unsigned int base = 1 << (w - 1);
  for (unsigned int i = 1; i < EclConfiguration::m_nsmp; i++) {
    adc[i] = adc[i - 1] + out.getNBits(w) - base;
  }
}

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The documentation for this class was generated from the following files:

• ecl/digitization/include/ECLCompress.h
• ecl/digitization/src/ECLCompress.cc