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/* -*- c++ -*- */
/*
* Copyright 2007,2013 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_VOCODER_CVSD_ENCODER_SB_IMPL_H
#define INCLUDED_VOCODER_CVSD_ENCODER_SB_IMPL_H
#include <gnuradio/vocoder/cvsd_encode_sb.h>
namespace gr {
namespace vocoder {
class cvsd_encode_sb_impl : public cvsd_encode_sb
{
private:
//! Member functions required by the encoder/decoder
//! \brief Rounding function specific to CVSD
//! \return the input value rounded to the nearest integer
int cvsd_round(double input);
//! \brief A power function specific to CVSD data formats
//! \return (radix)^power, where radix and power are short integers
unsigned int cvsd_pow(short radix, short power);
//! \brief Sums number of 1's in the input
//! \return the number of 1s in the four bytes of an input unsigned integer
unsigned char cvsd_bitwise_sum(unsigned int input);
// Members variables related to the CVSD encoder use to update interal reference value
short d_min_step;
short d_max_step;
double d_step_decay;
double d_accum_decay;
int d_K; //!< \brief Size of shift register; the number of output bits remembered in shift register
int d_J; //!< \brief Number of bits in the shift register that are equal; size of run of 1s, 0s
short d_pos_accum_max;
short d_neg_accum_max;
int d_accum; //!< \brief Current value of internal reference
int d_loop_counter; //!< \brief Current value of the loop counter
unsigned int d_runner; //!< \brief Current value of the shift register
short d_stepsize; //!< \brief Current value of the step sizer
public:
cvsd_encode_sb_impl(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);
~cvsd_encode_sb_impl();
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);
};
} /* namespace vocoder */
} /* namespace gr */
#endif /* INCLUDED_VOCODER_CVSD_ENCODE_SB_IMPL_H */
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