diff options
Diffstat (limited to 'gr-vocoder/lib/vocoder_cvsd_encode_sb.cc')
| -rw-r--r-- | gr-vocoder/lib/vocoder_cvsd_encode_sb.cc | 189 |
1 files changed, 0 insertions, 189 deletions
diff --git a/gr-vocoder/lib/vocoder_cvsd_encode_sb.cc b/gr-vocoder/lib/vocoder_cvsd_encode_sb.cc deleted file mode 100644 index e15882c22..000000000 --- a/gr-vocoder/lib/vocoder_cvsd_encode_sb.cc +++ /dev/null @@ -1,189 +0,0 @@ -/* -*- c++ -*- */ -/* - * Copyright 2007,2010,2011 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 <vocoder_cvsd_encode_sb.h> -#include <gr_io_signature.h> -#include <limits.h> - -/* - * Create a new instance of vocoder_cvsd_encode_sb and return - * a boost shared_ptr. This is effectively the public constructor. - */ -vocoder_cvsd_encode_sb_sptr -vocoder_make_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) -{ - return gnuradio::get_initial_sptr(new vocoder_cvsd_encode_sb (min_step, max_step, - step_decay, accum_decay, K, J, - pos_accum_max, neg_accum_max)); -} - -vocoder_cvsd_encode_sb::vocoder_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) - : gr_sync_decimator ("vocoder_cvsd_encode_sb", - gr_make_io_signature (1, 1, sizeof (short)), - gr_make_io_signature (1, 1, sizeof (unsigned char)), - 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_stepsize(min_step) - -{ - assert(d_K <= 32); - assert(d_J <= d_K); -} - - -vocoder_cvsd_encode_sb::~vocoder_cvsd_encode_sb () -{ - // nothing else required in this example -} - -unsigned char vocoder_cvsd_encode_sb::cvsd_bitwise_sum (unsigned int input) -{ - unsigned int temp=input; - unsigned char bits=0; - - while(temp) { - temp=temp&(temp-1); - bits++; - } - return bits; -} - -int vocoder_cvsd_encode_sb::cvsd_round (double input) -{ - double temp; - temp=input+0.5; - temp=floor(temp); - - return (int)temp; -} - -unsigned int vocoder_cvsd_encode_sb::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 -vocoder_cvsd_encode_sb::work (int noutput_items, - gr_vector_const_void_star &input_items, - gr_vector_void_star &output_items) -{ - const short *in = (const short *) input_items[0]; - unsigned char *out = (unsigned char *) output_items[0]; - - unsigned short i=0; // 2 bytes, 0 .. 65,535 - unsigned char output_bit=0; // 1 byte, 0 .. 255 - unsigned char output_byte=0; // 1 bytes 0.255 - unsigned char bit_count=0; // 1 byte, 0 .. 255 - unsigned int mask=0; // 4 bytes, 0 .. 4,294,967,295 - - // Loop through each input data point - for(i = 0; i < noutput_items*8; i++) { - if((int)in[i] >= d_accum) { // Note: sign((data(n)-accum)) - output_bit=1; - } - else { - output_bit=0; - } - - // Update Accum (i.e. the reference value) - if (output_bit) { - d_accum=d_accum+d_stepsize; - //printf("Addding %d to the accum; the result is: %d.\n", d_stepsize, d_accum); - } - else { - d_accum=d_accum-d_stepsize; - //printf("Subtracting %d to the accum; the result is: %d.\n", d_stepsize, d_accum); - } - - // 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; - } - - // Update runner with the last output bit - // Update Step Size - if (d_loop_counter >= d_J) { // Run this only if you have >= J bits in your shift register - mask=(cvsd_pow(2, d_J) - 1); - if ((cvsd_bitwise_sum(d_runner & mask) >= d_J) || (cvsd_bitwise_sum((~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); - } - } - - // Runner is a shift-register; shift left, add on newest output bit - d_runner = (d_runner<<1) | ((unsigned int) output_bit); - - // Update the ouput type; shift left, add on newest output bit - // If you have put in 8 bits, output it as a byte - output_byte = (output_byte<<1) | output_bit; - bit_count++; - - if (d_loop_counter <= d_K) { - d_loop_counter++; - } - - // If you have put 8 bits, output and clear. - if (bit_count==8) { - // Read in short from the file - *(out++) = output_byte; - - // Reset the bit_count - bit_count=0; - output_byte=0; - } - } // While - - return noutput_items; -} |