/* -*- c++ -*- */ /* * Copyright 2004 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. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include <trellis_permutation.h> #include <gr_io_signature.h> #include <iostream> #include <string.h> trellis_permutation_sptr trellis_make_permutation (int K, const std::vector<int> &TABLE, int SYMS_PER_BLOCK, size_t NBYTES_INOUT) { return trellis_permutation_sptr (new trellis_permutation (K,TABLE,SYMS_PER_BLOCK,NBYTES_INOUT)); } trellis_permutation::trellis_permutation (int K, const std::vector<int> &TABLE, int SYMS_PER_BLOCK, size_t NBYTES_INOUT) : gr_sync_block ("permutation", gr_make_io_signature (1, -1, NBYTES_INOUT), gr_make_io_signature (1, -1, NBYTES_INOUT)), d_K (K), d_TABLE (TABLE), d_SYMS_PER_BLOCK (SYMS_PER_BLOCK), d_NBYTES_INOUT (NBYTES_INOUT) { set_output_multiple (d_K*SYMS_PER_BLOCK); //std::cout << d_K << "\n"; } int trellis_permutation::work (int noutput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items) { int nstreams = input_items.size(); assert (input_items.size() == output_items.size()); assert (noutput_items % d_K ==0); for (int m=0;m<nstreams;m++) { const char *in = (const char *) input_items[m]; char *out = (char *) output_items[m]; // per stream processing for (int i = 0; i < noutput_items/d_SYMS_PER_BLOCK; i++){ // Index i refers to blocks. // Begining of packet (in blocks) int i0 = d_K*(i/d_K); // position of block within packet (in blocks) int j0 = i%d_K; // new position of block within packet (in blocks) int k0 = d_TABLE[j0]; memcpy(&(out[i*d_SYMS_PER_BLOCK*d_NBYTES_INOUT]), &(in[(i0+k0)*d_SYMS_PER_BLOCK*d_NBYTES_INOUT]), d_NBYTES_INOUT*d_SYMS_PER_BLOCK); } // end per stream processing } return noutput_items; }