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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_DEINTERLEAVER_IMPL_H
#define INCLUDED_DTV_ATSC_DEINTERLEAVER_IMPL_H
#include "atsc_types.h"
#include "interleaver_fifo.h"
#include <gnuradio/dtv/atsc_deinterleaver.h>
namespace gr {
namespace dtv {
class atsc_deinterleaver_impl : public atsc_deinterleaver
{
private:
static constexpr int s_interleavers = 52;
//! transform a single symbol
unsigned char transform(unsigned char input)
{
unsigned char retval = m_fifo[m_commutator].stuff(input);
m_commutator++;
if (m_commutator >= s_interleavers)
m_commutator = 0;
return retval;
}
/*!
* Note: The use of the alignment_fifo keeps the encoder and decoder
* aligned if both are synced to a field boundary. There may be other
* ways to implement this function. This is a best guess as to how
* this should behave, as we have no test vectors for either the
* interleaver or deinterleaver.
*/
interleaver_fifo<unsigned char> alignment_fifo;
int m_commutator;
std::vector<interleaver_fifo<unsigned char>> m_fifo;
public:
atsc_deinterleaver_impl();
~atsc_deinterleaver_impl() override;
int work(int noutput_items,
gr_vector_const_void_star& input_items,
gr_vector_void_star& output_items) override;
//! reset interleaver (flushes contents and resets commutator)
void reset();
//! sync interleaver (resets commutator, but doesn't flush fifos)
void sync() { m_commutator = 0; }
};
} /* namespace dtv */
} /* namespace gr */
#endif /* INCLUDED_DTV_ATSC_DEINTERLEAVER_IMPL_H */
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