diff options
Diffstat (limited to 'gr-cvsd-vocoder/src/lib/cvsd_decode_bs.cc')
| -rw-r--r-- | gr-cvsd-vocoder/src/lib/cvsd_decode_bs.cc | 193 |
1 files changed, 0 insertions, 193 deletions
diff --git a/gr-cvsd-vocoder/src/lib/cvsd_decode_bs.cc b/gr-cvsd-vocoder/src/lib/cvsd_decode_bs.cc deleted file mode 100644 index 26dcb29da..000000000 --- a/gr-cvsd-vocoder/src/lib/cvsd_decode_bs.cc +++ /dev/null @@ -1,193 +0,0 @@ -/* -*- c++ -*- */ -/* - * Copyright 2007,2010 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. - */ - -/* - * config.h is generated by configure. It contains the results - * of probing for features, options etc. It should be the first - * file included in your .cc file. - */ -#ifdef HAVE_CONFIG_H -#include "config.h" -#endif - -#include <cvsd_decode_bs.h> -#include <gr_io_signature.h> -#include <limits.h> - -/* - * Create a new instance of cvsd_decode_bs and return - * a boost shared_ptr. This is effectively the public constructor. - */ -cvsd_decode_bs_sptr -cvsd_make_decode_bs (short min_step, short max_step, double step_decay, - double accum_decay, int K, int J, - short pos_accum_max, short neg_accum_max) -{ - return gnuradio::get_initial_sptr(new cvsd_decode_bs (min_step, max_step, - step_decay, accum_decay, K, J, - pos_accum_max, neg_accum_max)); -} - -cvsd_decode_bs::cvsd_decode_bs (short min_step, short max_step, double step_decay, - double accum_decay, int K, int J, - short pos_accum_max, short neg_accum_max) - : gr_sync_interpolator ("cvsd_decode_bs", - gr_make_io_signature (1, 1, sizeof (unsigned char)), - gr_make_io_signature (1, 1, sizeof (short)), - 8), - d_min_step (min_step), d_max_step(max_step), d_step_decay(step_decay), - d_accum_decay(accum_decay), d_K(K), d_J(J), - d_pos_accum_max(pos_accum_max), d_neg_accum_max(neg_accum_max), - d_accum(0), - d_loop_counter(1), - d_runner(0), - d_runner_mask(0), - d_stepsize(min_step) - -{ - assert(d_K <= 32); - assert(d_J <= d_K); -} - - -cvsd_decode_bs::~cvsd_decode_bs () -{ - // nothing else required in this example -} - -unsigned char cvsd_decode_bs::cvsd_bitwise_sum (unsigned int input) -{ - unsigned int temp=input; - unsigned char bits=0; - - while(temp) { - temp=temp&(temp-1); - bits++; - } - return bits; -} - -int cvsd_decode_bs::cvsd_round (double input) -{ - double temp; - temp=input+0.5; - temp=floor(temp); - - return (int)temp; -} - -unsigned int cvsd_decode_bs::cvsd_pow (short radix, short power) -{ - double d_radix = (double) radix; - int i_power = (int) power; - double output; - - output=pow(d_radix,i_power); - return ( (unsigned int) cvsd_round(output)); -} - - -int -cvsd_decode_bs::work (int noutput_items, - gr_vector_const_void_star &input_items, - gr_vector_void_star &output_items) -{ - - - const unsigned char *in = (const unsigned char *) input_items[0]; - short *out = (short *) output_items[0]; - - int i=0; - short output_short=0; // 2 bytes 0 .. 65,535 - unsigned char bit_count=0; // 1 byte, 0 .. 255 - unsigned int mask=0; // 4 bytes, 0 .. 4,294,967,295 - unsigned char input_byte=0; // 1 bytes - unsigned char input_bit=0; // 1 byte, 0 .. 255 - - // Loop through each input data point - for(i = 0; i < noutput_items/8.0; i++) { - - input_byte = in[i]; - // Initiliaze bit counter - bit_count=0; - - while(bit_count<8) { - // Compute the Appropriate Mask - mask=cvsd_pow(2,7-bit_count); - - // Pull off the corresponding bit - input_bit = input_byte & mask; - - // Update the bit counter - bit_count++; - - // Update runner with the next input bit - // Runner is a shift-register; shift left, add on newest output bit - d_runner = (d_runner<<1) | ((unsigned int) input_bit); - - // Run this only if you have >= J bits in your shift register - if (d_loop_counter>=d_J) { - // Update Step Size - d_runner_mask=(cvsd_pow(2,d_J)-1); - if ((cvsd_bitwise_sum(d_runner & d_runner_mask)>=d_J)||(cvsd_bitwise_sum((~d_runner) & d_runner_mask)>=d_J)) { - // Runs of 1s and 0s - d_stepsize = std::min( (short) (d_stepsize + d_min_step), d_max_step); - } - else { - // No runs of 1s and 0s - d_stepsize = std::max( (short) cvsd_round(d_stepsize*d_step_decay), d_min_step); - } - } - - // Update Accum (i.e. the reference value) - if (input_bit) { - d_accum=d_accum+d_stepsize; - } - else { - d_accum=d_accum-d_stepsize; - } - - // Multiply by Accum_Decay - d_accum=(cvsd_round(d_accum*d_accum_decay)); - - // Check for overflow - if (d_accum >=((int) d_pos_accum_max)) { - d_accum=(int)d_pos_accum_max; - } - else if (d_accum <=((int) d_neg_accum_max)) { - d_accum=(int)d_neg_accum_max; - } - - // Find the output short to write to the file - output_short=((short) d_accum); - - if (d_loop_counter <= d_K) { - d_loop_counter++; - } - - *(out++) = output_short; - } // while () - - } // for() - - return noutput_items; -} |