3 * Copyright 2004 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
7 * GNU Radio is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3, or (at your option)
12 * GNU Radio is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with GNU Radio; see the file COPYING. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street,
20 * Boston, MA 02110-1301, USA.
23 // WARNING: this file is machine generated. Edits will be over written
29 #include <trellis_viterbi_combined_sb.h>
30 #include <gr_io_signature.h>
34 static const float INF = 1.0e9;
36 trellis_viterbi_combined_sb_sptr
37 trellis_make_viterbi_combined_sb (
43 const std::vector<short> &TABLE,
44 trellis_metric_type_t TYPE)
46 return trellis_viterbi_combined_sb_sptr (new trellis_viterbi_combined_sb (FSM,K,S0,SK,D,TABLE,TYPE));
49 trellis_viterbi_combined_sb::trellis_viterbi_combined_sb (
55 const std::vector<short> &TABLE,
56 trellis_metric_type_t TYPE)
57 : gr_block ("viterbi_combined_sb",
58 gr_make_io_signature (1, -1, sizeof (short)),
59 gr_make_io_signature (1, -1, sizeof (unsigned char))),
69 set_relative_rate (1.0 / ((double) d_D));
70 set_output_multiple (d_K);
74 void trellis_viterbi_combined_sb::set_TABLE(const std::vector<short> &table)
80 trellis_viterbi_combined_sb::forecast (int noutput_items, gr_vector_int &ninput_items_required)
82 assert (noutput_items % d_K == 0);
83 int input_required = d_D * noutput_items ;
84 unsigned ninputs = ninput_items_required.size();
85 for (unsigned int i = 0; i < ninputs; i++) {
86 ninput_items_required[i] = input_required;
93 void viterbi_algorithm_combined(int I, int S, int O,
94 const std::vector<int> &NS,
95 const std::vector<int> &OS,
96 const std::vector< std::vector<int> > &PS,
97 const std::vector< std::vector<int> > &PI,
101 const std::vector<short> &TABLE,
102 trellis_metric_type_t TYPE,
103 const short *in, unsigned char *out)//,
104 //std::vector<int> &trace)
106 std::vector<int> trace(S*K);
107 std::vector<float> alpha(S*2);
108 float *metric = new float[O];
114 if(S0<0) { // initial state not specified
115 for(int i=0;i<S;i++) alpha[0*S+i]=0;
118 for(int i=0;i<S;i++) alpha[0*S+i]=INF;
123 for(int k=0;k<K;k++) {
124 calc_metric(O, D, TABLE, &(in[k*D]), metric,TYPE); // calc metrics
126 for(int j=0;j<S;j++) { // for each next state do ACS
129 for(unsigned int i=0;i<PS[j].size();i++) {
131 if((mm=alpha[alphai*S+PS[j][i]]+metric[OS[PS[j][i]*I+PI[j][i]]])<minm)
135 alpha[((alphai+1)%2)*S+j]=minm;
136 if(minm<norm) norm=minm;
139 alpha[((alphai+1)%2)*S+j]-=norm; // normalize total metrics so they do not explode
143 if(SK<0) { // final state not specified
147 if((mm=alpha[alphai*S+i])<minm) minm=mm,minmi=i;
154 for(int k=K-1;k>=0;k--) { // traceback
155 int i0=trace[k*S+st];
156 out[k]= (unsigned char) PI[st][i0];
170 trellis_viterbi_combined_sb::general_work (int noutput_items,
171 gr_vector_int &ninput_items,
172 gr_vector_const_void_star &input_items,
173 gr_vector_void_star &output_items)
175 assert (input_items.size() == output_items.size());
176 int nstreams = input_items.size();
177 assert (noutput_items % d_K == 0);
178 int nblocks = noutput_items / d_K;
180 for (int m=0;m<nstreams;m++) {
181 const short *in = (const short *) input_items[m];
182 unsigned char *out = (unsigned char *) output_items[m];
183 for (int n=0;n<nblocks;n++) {
184 viterbi_algorithm_combined(d_FSM.I(),d_FSM.S(),d_FSM.O(),d_FSM.NS(),d_FSM.OS(),d_FSM.PS(),d_FSM.PI(),d_K,d_S0,d_SK,d_D,d_TABLE,d_TYPE,&(in[n*d_K*d_D]),&(out[n*d_K]));//,d_trace);
188 consume_each (d_D * noutput_items );
189 return noutput_items;