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/* -*- c++ -*- */
/*
* Copyright 2002 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 2, 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 _ATSC_VITERBI_DECODER_H_
#define _ATSC_VITERBI_DECODER_H_
#define USE_SIMPLE_SLICER 0
#include <atsc_types.h>
#include <interleaver_fifo.h>
#if (USE_SIMPLE_SLICER)
#include <atsci_fake_single_viterbi.h>
typedef atsci_fake_single_viterbi single_viterbi_t;
#else
#include <atsci_single_viterbi.h>
typedef atsci_single_viterbi single_viterbi_t;
#endif
/*!
* \brief fancy, schmancy 12-way interleaved viterbi decoder for ATSC
*/
class atsci_viterbi_decoder {
public:
static const int NCODERS = 12;
atsci_viterbi_decoder ();
~atsci_viterbi_decoder ();
//! reset all decoder states
void reset ();
/*!
* Take 12 data segments of soft decisions (floats) and
* produce 12 RS encoded data segments. We work in groups of 12
* because that's the smallest number of segments that composes a
* single full cycle of the decoder mux.
*/
void decode (atsc_mpeg_packet_rs_encoded out[NCODERS],
const atsc_soft_data_segment in[NCODERS]);
protected:
typedef interleaver_fifo<unsigned char> fifo_t;
static const int SEGMENT_SIZE = ATSC_MPEG_RS_ENCODED_LENGTH; // 207
static const int OUTPUT_SIZE = (SEGMENT_SIZE * 12);
static const int INPUT_SIZE = (ATSC_DATA_SEGMENT_LENGTH * 12);
void decode_helper (unsigned char out[OUTPUT_SIZE],
const float in[INPUT_SIZE]);
single_viterbi_t viterbi[NCODERS];
fifo_t *fifo[NCODERS];
bool debug;
};
#endif /* _ATSC_VITERBI_DECODER_H_ */
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