rdsdecoder.h

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// Copyright (C) 2015 F4EXB                                                      //
// written by Edouard Griffiths                                                  //
//                                                                               //
// This program 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 as version 3 of the License, or                  //
// (at your option) any later version.                                           //
//                                                                               //
// This program 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 V3 for more details.                               //
//                                                                               //
// You should have received a copy of the GNU General Public License             //
// along with this program. If not, see <http://www.gnu.org/licenses/>.          //

#ifndef PLUGINS_CHANNEL_BFM_RDSDECODER_H_
#define PLUGINS_CHANNEL_BFM_RDSDECODER_H_

class RDSDecoder
{
public:
    RDSDecoder();
    ~RDSDecoder();

    bool frameSync(bool bit);
    unsigned int *getGroup() { return m_group; }
    bool synced() const { return m_sync == SYNC; }

    float          m_qua;

protected:
    unsigned int calc_syndrome(unsigned long message, unsigned char mlen);
    void enter_sync(unsigned int sync_block_number);
    void enter_no_sync();

private:
    unsigned long m_reg;
    enum { NO_SYNC, SYNC } m_sync;
    bool m_presync;
    unsigned long  m_lastseenOffsetCounter;
    unsigned long  m_bitCounter;
    unsigned char  m_lastseenOffset;
    unsigned int   m_blockBitCounter;
    unsigned int   m_wrongBlocksCounter;
    unsigned int   m_blocksCounter;
    unsigned int   m_groupGoodBlocksCounter;
    unsigned char  m_blockNumber;
    bool           m_groupAssemblyStarted;
    bool           m_goodBlock;
    unsigned int   m_group[4];

    /* see page 59, Annex C, table C.1 in the standard
     * offset word C' has been put at the end */
    static const unsigned int offset_pos[5];
    static const unsigned int offset_word[5];
    static const unsigned int syndrome[5];
};



#endif /* PLUGINS_CHANNEL_BFM_RDSDECODER_H_ */