rftimeblockencoder.h

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#ifndef DYSCO_RFTIME_BLOCK_ENCODER_H
#define DYSCO_RFTIME_BLOCK_ENCODER_H
 
#include "stochasticencoder.h"
#include "timeblockbuffer.h"
#include "uvector.h"
 
#include <complex>
#include <random>
#include <vector>
 
#include "timeblockencoder.h"
 
class RFTimeBlockEncoder : public TimeBlockEncoder {
 public:
  RFTimeBlockEncoder(size_t nPol, size_t nChannels);
 
  virtual ~RFTimeBlockEncoder() override;
 
  virtual void EncodeWithDithering(
      const dyscostman::StochasticEncoder<float> &gausEncoder, FBuffer &buffer,
      float *metaBuffer, symbol_t *symbolBuffer, size_t antennaCount,
      std::mt19937 &rnd) final override {
    encode<true>(gausEncoder, buffer, metaBuffer, symbolBuffer, antennaCount,
                 &rnd);
  }
 
  virtual void EncodeWithoutDithering(
      const dyscostman::StochasticEncoder<float> &gausEncoder, FBuffer &buffer,
      float *metaBuffer, symbol_t *symbolBuffer,
      size_t antennaCount) final override {
    encode<false>(gausEncoder, buffer, metaBuffer, symbolBuffer, antennaCount,
                  0);
  }
 
  virtual void InitializeDecode(const float *metaBuffer, size_t nRow,
                                size_t nAntennae) final override;
 
  virtual void Decode(const dyscostman::StochasticEncoder<float> &gausEncoder,
                      FBuffer &buffer, const symbol_t *symbolBuffer,
                      size_t blockRow, size_t antenna1,
                      size_t antenna2) final override;
 
  virtual size_t SymbolCount(size_t nRow, size_t nPol,
                             size_t nChannels) const final override {
    return nRow * nChannels * nPol * 2 /*complex*/;
  }
 
  virtual size_t SymbolCount(size_t nRow) const final override {
    return nRow * _nChannels * _nPol * 2 /*complex*/;
  }
 
  virtual size_t SymbolsPerRow() const final override {
    return _nChannels * _nPol * 2 /*complex*/;
  }
 
  virtual size_t MetaDataCount(size_t nRow, size_t nPol, size_t nChannels,
                               size_t /*nAntennae*/) const final override {
    return nPol * (nChannels + nRow);
  }
 
  void Normalize(const dyscostman::StochasticEncoder<float> &gausEncoder,
                 TimeBlockBuffer<std::complex<float>> &buffer,
                 size_t antennaCount);
 
 private:
  void calculateAntennaeRMS(const std::vector<DBufferRow> &data,
                            size_t polIndex, size_t antennaCount);
 
  template <bool UseDithering>
  void encode(const dyscostman::StochasticEncoder<float> &gausEncoder,
              const FBuffer &buffer, float *metaBuffer, symbol_t *symbolBuffer,
              size_t antennaCount, std::mt19937 *rnd);
 
  void changeChannelFactor(std::vector<DBufferRow> &data, float *metaBuffer,
                           size_t visIndex, double factor);
  void fitToMaximum(std::vector<DBufferRow> &data, float *metaBuffer,
                    const dyscostman::StochasticEncoder<float> &gausEncoder,
                    size_t antennaCount);
 
  size_t _nPol, _nChannels;
 
  ao::uvector<double> _channelFactors, _rowFactors;
  std::uniform_int_distribution<unsigned> _ditherDist;
};
 
#endif