/* -*- c++ -*- */
/*
 * Copyright 2007,2011,2012 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_DIGITAL_OFDM_FRAME_SINK_IMPL_H
#define INCLUDED_DIGITAL_OFDM_FRAME_SINK_IMPL_H

#include <gnuradio/digital/ofdm_frame_sink.h>

namespace gr {
namespace digital {

class ofdm_frame_sink_impl : public ofdm_frame_sink
{
private:
    enum state_t { STATE_SYNC_SEARCH, STATE_HAVE_SYNC, STATE_HAVE_HEADER };

    static const int MAX_PKT_LEN = 4096;
    static const int HEADERBYTELEN = 4;

    msg_queue::sptr d_target_queue; // where to send the packet when received
    state_t d_state;
    unsigned int d_header;   // header bits
    int d_headerbytelen_cnt; // how many so far

    char* d_bytes_out; // hold the current bytes produced by the demapper

    int d_occupied_carriers;
    unsigned int d_byte_offset;
    unsigned int d_partial_byte;

    char d_packet[MAX_PKT_LEN];   // assembled payload
    int d_packetlen;              // length of packet
    int d_packet_whitener_offset; // offset into whitener string to use
    int d_packetlen_cnt;          // how many so far

    gr_complex*
        d_derotated_output; // Pointer to output stream to send deroated symbols out

    std::vector<gr_complex> d_sym_position;
    std::vector<char> d_sym_value_out;
    std::vector<gr_complex> d_dfe;
    unsigned int d_nbits;

    char d_resid;
    unsigned int d_nresid;
    float d_phase;
    float d_freq;
    float d_phase_gain;
    float d_freq_gain;
    float d_eq_gain;

    std::vector<int> d_subcarrier_map;

protected:
    void enter_search();
    void enter_have_sync();
    void enter_have_header();

    bool header_ok()
    {
        // confirm that two copies of header info are identical
        return ((d_header >> 16) ^ (d_header & 0xffff)) == 0;
    }

    char slicer(const gr_complex x);
    unsigned int demapper(const gr_complex* in, char* out);

    bool set_sym_value_out(const std::vector<gr_complex>& sym_position,
                           const std::vector<char>& sym_value_out);

public:
    ofdm_frame_sink_impl(const std::vector<gr_complex>& sym_position,
                         const std::vector<char>& sym_value_out,
                         msg_queue::sptr target_queue,
                         int occupied_tones,
                         float phase_gain = 0.25,
                         float freq_gain = 0.25 * 0.25 / 4);
    ~ofdm_frame_sink_impl();

    int work(int noutput_items,
             gr_vector_const_void_star& input_items,
             gr_vector_void_star& output_items);
};

} /* namespace digital */
} /* namespace gr */

#endif /* INCLUDED_GR_OFDM_FRAME_SINK_IMPL_H */
