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.
27 #include <trellis_permutation.h>
28 #include <gr_io_signature.h>
31 trellis_permutation_sptr
32 trellis_make_permutation (int K, const std::vector<int> &TABLE, int SYMS_PER_BLOCK, size_t NBYTES_INOUT)
34 return trellis_permutation_sptr (new trellis_permutation (K,TABLE,SYMS_PER_BLOCK,NBYTES_INOUT));
37 trellis_permutation::trellis_permutation (int K, const std::vector<int> &TABLE, int SYMS_PER_BLOCK, size_t NBYTES_INOUT)
38 : gr_sync_block ("permutation",
39 gr_make_io_signature (1, -1, NBYTES_INOUT),
40 gr_make_io_signature (1, -1, NBYTES_INOUT)),
43 d_SYMS_PER_BLOCK (SYMS_PER_BLOCK),
44 d_NBYTES_INOUT (NBYTES_INOUT)
46 set_output_multiple (d_K*SYMS_PER_BLOCK);
47 //std::cout << d_K << "\n";
53 trellis_permutation::work (int noutput_items,
54 gr_vector_const_void_star &input_items,
55 gr_vector_void_star &output_items)
57 int nstreams = input_items.size();
58 assert (input_items.size() == output_items.size());
59 assert (noutput_items % d_K ==0);
61 for (int m=0;m<nstreams;m++) {
62 const char *in = (const char *) input_items[m];
63 char *out = (char *) output_items[m];
65 // per stream processing
66 for (int i = 0; i < noutput_items/d_SYMS_PER_BLOCK; i++){
67 // Index i refers to blocks.
68 // Begining of packet (in blocks)
70 // position of block within packet (in blocks)
72 // new position of block within packet (in blocks)
74 memcpy(&(out[i*d_SYMS_PER_BLOCK*d_NBYTES_INOUT]),
75 &(in[(i0+k0)*d_SYMS_PER_BLOCK*d_NBYTES_INOUT]),
76 d_NBYTES_INOUT*d_SYMS_PER_BLOCK);
78 // end per stream processing