trellis_encoder_impl.h

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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 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 _ATSC_TRELLIS_ENCODER_H_
#define _ATSC_TRELLIS_ENCODER_H_

#include <gnuradio/atsc/api.h>
#include <gnuradio/atsc/basic_trellis_encoder_impl.h>
#include <gnuradio/atsc/types.h>

/*!
 * \brief fancy, schmancy 12-way interleaved trellis encoder for ATSC
 */

class ATSC_API atsci_trellis_encoder
{
public:
    static const int NCODERS = 12;

    atsci_trellis_encoder();
    ~atsci_trellis_encoder();

    //! reset all encoder states
    void reset();

    /*!
     * Take 12 RS encoded, convolutionally interleaved segments and
     * produce 12 trellis coded data segments.  We work in groups of 12
     * because that's the smallest number of segments that composes a
     * single full cycle of the encoder mux.
     */
    void encode(atsc_data_segment out[NCODERS],
                const atsc_mpeg_packet_rs_encoded in[NCODERS]);


protected:
    static const int SEGMENT_SIZE = ATSC_MPEG_RS_ENCODED_LENGTH; // 207
    static const int INPUT_SIZE = (SEGMENT_SIZE * 12);
    static const int OUTPUT_SIZE = (ATSC_DATA_SEGMENT_LENGTH * 12);

    void encode_helper(unsigned char out[OUTPUT_SIZE],
                       const unsigned char in[INPUT_SIZE]);

    atsci_basic_trellis_encoder enc[NCODERS];
    bool debug;
};


#endif /* _ATSC_TRELLIS_ENCODER_H_ */