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/* -*- c++ -*- */
/*
* Copyright 2007 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 INCLUDED_CVSD_ENCODER_SB_H
#define INCLUDED_CVSD_ENCODER_SB_H
#include <gr_sync_decimator.h>
class cvsd_encode_sb;
typedef boost::shared_ptr<cvsd_encode_sb> cvsd_encode_sb_sptr;
cvsd_encode_sb_sptr cvsd_make_encode_sb (short min_step=10,
short max_step=1280,
double step_decay=0.9990234375,
double accum_decay= 0.96875,
int K=32,
int J=4,
short pos_accum_max=32767,
short neg_accum_max=-32767);
class cvsd_encode_sb : public gr_sync_decimator
{
private:
friend cvsd_encode_sb_sptr cvsd_make_encode_sb (short min_step,
short max_step,
double step_decay,
double accum_decay,
int K,
int J,
short pos_accum_max,
short neg_accum_max);
cvsd_encode_sb (short min_step, short max_step, double step_decay,
double accum_decay, int K, int J,
short pos_accum_max, short neg_accum_max);
int cvsd_round(double input);
unsigned int cvsd_pow (short radix, short power);
unsigned char cvsd_bitwise_sum (unsigned int input);
short d_min_step;
short d_max_step;
double d_step_decay;
double d_accum_decay;
//! \brief Size of shift register; the number of output bits remembered in shift register
int d_K;
//! \brief Number of bits in the shift register that are equal; size of run of 1s, 0s
int d_J;
short d_pos_accum_max;
short d_neg_accum_max;
int d_accum;
int d_loop_counter;
unsigned int d_runner;
short d_stepsize;
public:
~cvsd_encode_sb (); // public destructor
short min_step() { return d_min_step; }
short max_step() { return d_max_step; }
double step_decay() { return d_step_decay; }
double accum_decay() { return d_accum_decay; }
int K() { return d_K; }
int J() { return d_J; }
short pos_accum_max() { return d_pos_accum_max; }
short neg_accum_max() { return d_neg_accum_max; }
int work (int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items);
};
#endif /* INCLUDED_CVSD_ENCODE_SB_H */
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