3 * Copyright 2008 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 <gr_stretch_ff.h>
28 #include <gr_io_signature.h>
31 gr_make_stretch_ff(float lo, size_t vlen)
33 return gr_stretch_ff_sptr(new gr_stretch_ff(lo, vlen));
36 gr_stretch_ff::gr_stretch_ff(float lo, size_t vlen)
37 : gr_sync_block("stretch_ff",
38 gr_make_io_signature(1, 1, vlen * sizeof(float)),
39 gr_make_io_signature(1, 1, vlen * sizeof(float))),
40 d_lo(lo), d_vlen(vlen)
45 gr_stretch_ff::work(int noutput_items,
46 gr_vector_const_void_star &input_items,
47 gr_vector_void_star &output_items)
49 const float *in = (const float *) input_items[0];
50 float *out = (float *) output_items[0];
52 for (int count = 0; count < noutput_items; count++) {
53 float vmax = in[0] - d_lo;
55 for (unsigned int i = 1; i < d_vlen; i++) {
56 float vtmp = in[i] - d_lo;
62 for (unsigned int i = 0; i < d_vlen; i++)
63 out[i] = d_lo * (1.0 - (in[i] - d_lo) / vmax);
65 for (unsigned int i = 0; i < d_vlen; i++)