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/* -*- c++ -*- */
/*
* Copyright 2014,2016 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef INCLUDED_DTV_ATSC_SYNC_IMPL_H
#define INCLUDED_DTV_ATSC_SYNC_IMPL_H
#include <gnuradio/dtv/atsc_consts.h>
#include <gnuradio/dtv/atsc_sync.h>
#include <gnuradio/filter/single_pole_iir.h>
#include <gnuradio/filter/mmse_fir_interpolator_ff.h>
namespace gr {
namespace dtv {
class atsc_sync_impl : public atsc_sync
{
private:
gr::filter::single_pole_iir<float,float,float> d_loop; // ``VCO'' loop filter
gr::filter::mmse_fir_interpolator_ff d_interp;
unsigned long long d_next_input;
double d_rx_clock_to_symbol_freq;
int d_si;
double d_w; // ratio of PERIOD of Tx to Rx clocks
double d_mu; // fractional delay [0,1]
int d_incr;
float d_sample_mem[ATSC_DATA_SEGMENT_LENGTH];
float d_data_mem[ATSC_DATA_SEGMENT_LENGTH];
double d_timing_adjust;
int d_counter; // free running mod 832 counter
int d_symbol_index;
bool d_seg_locked;
unsigned char d_sr; // 4 bit shift register
signed char d_integrator[ATSC_DATA_SEGMENT_LENGTH];
int d_output_produced;
public:
atsc_sync_impl(float rate);
~atsc_sync_impl();
void reset();
void forecast(int noutput_items,
gr_vector_int &ninput_items_required);
virtual int general_work(int noutput_items,
gr_vector_int &ninput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items);
};
} /* namespace dtv */
} /* namespace gr */
#endif /* INCLUDED_DTV_ATSC_SYNC_IMPL_H */
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