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/* -*- c++ -*- */
/*
* Copyright 2007,2011,2013 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifndef INCLUDED_VOCODER_CVSD_DECODE_BS_IMPL_H
#define INCLUDED_VOCODER_CVSD_DECODE_BS_IMPL_H
#include <gnuradio/vocoder/cvsd_decode_bs.h>
namespace gr {
namespace vocoder {
class cvsd_decode_bs_impl : public cvsd_decode_bs
{
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);
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
unsigned int d_runner_mask; //!< \brief Value of the mask to access the last J bits of
//!< the shift register
short d_stepsize; //!< \brief Current value of the step sizer
public:
cvsd_decode_bs_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_decode_bs_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) override;
};
} /* namespace vocoder */
} /* namespace gr */
#endif /* INCLUDED_VOCODER_CVSD_DECODE_BS_IMPL_H */
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