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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_FS_CHECKER_IMPL_H
#define INCLUDED_DTV_ATSC_FS_CHECKER_IMPL_H
#include "atsc_syminfo_impl.h"
#include <gnuradio/dtv/atsc_fs_checker.h>
namespace gr {
namespace dtv {
class atsc_fs_checker_impl : public atsc_fs_checker
{
private:
static constexpr int SRSIZE = 1024; // must be power of two
int d_index; // points at oldest sample
float d_sample_sr[SRSIZE]; // sample shift register
atsc::syminfo d_tag_sr[SRSIZE]; // tag shift register
unsigned char d_bit_sr[SRSIZE]; // binary decision shift register
int d_field_num;
int d_segment_num;
static constexpr int OFFSET_511 = 4; // offset to second PN 63 pattern
static constexpr int LENGTH_511 = 511; // length of PN 63 pattern
static constexpr int OFFSET_2ND_63 = 578; // offset to second PN 63 pattern
static constexpr int LENGTH_2ND_63 = 63; // length of PN 63 pattern
inline static int wrap(int index) { return index & (SRSIZE - 1); }
inline static int incr(int index) { return wrap(index + 1); }
inline static int decr(int index) { return wrap(index - 1); }
public:
atsc_fs_checker_impl();
~atsc_fs_checker_impl() override;
void reset();
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_FS_CHECKER_IMPL_H */
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