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/* -*- c++ -*- */
/*
* Copyright 2014 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifndef INCLUDED_DTV_ATSC_EQUALIZER_IMPL_H
#define INCLUDED_DTV_ATSC_EQUALIZER_IMPL_H
#include "atsc_syminfo_impl.h"
#include <gnuradio/dtv/atsc_consts.h>
#include <gnuradio/dtv/atsc_equalizer.h>
namespace gr {
namespace dtv {
class atsc_equalizer_impl : public atsc_equalizer
{
private:
static constexpr int NTAPS = 64;
static constexpr int NPRETAPS =
(int)(NTAPS * 0.8); // probably should be either .2 or .8
// the length of the field sync pattern that we know unequivocally
static constexpr int KNOWN_FIELD_SYNC_LENGTH = 4 + 511 + 3 * 63;
float training_sequence1[KNOWN_FIELD_SYNC_LENGTH];
float training_sequence2[KNOWN_FIELD_SYNC_LENGTH];
void filterN(const float* input_samples, float* output_samples, int nsamples);
void adaptN(const float* input_samples,
const float* training_pattern,
float* output_samples,
int nsamples);
std::vector<float> d_taps;
float data_mem[ATSC_DATA_SEGMENT_LENGTH + NTAPS]; // Buffer for previous data packet
float data_mem2[ATSC_DATA_SEGMENT_LENGTH];
unsigned short d_flags;
short d_segno;
bool d_buff_not_filled = true;
public:
atsc_equalizer_impl();
~atsc_equalizer_impl() override;
void setup_rpc() override;
std::vector<float> taps() const override;
std::vector<float> data() const override;
int general_work(int noutput_items,
gr_vector_int& ninput_items,
gr_vector_const_void_star& input_items,
gr_vector_void_star& output_items) override;
};
} /* namespace dtv */
} /* namespace gr */
#endif /* INCLUDED_DTV_ATSC_EQUALIZER_IMPL_H */
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