3 * Copyright 2004,2010 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_bytes_to_syms.h>
28 #include <gr_io_signature.h>
31 static const int BITS_PER_BYTE = 8;
34 gr_make_bytes_to_syms ()
36 return gnuradio::get_initial_sptr(new gr_bytes_to_syms ());
39 gr_bytes_to_syms::gr_bytes_to_syms ()
40 : gr_sync_interpolator ("bytes_to_syms",
41 gr_make_io_signature (1, 1, sizeof (unsigned char)),
42 gr_make_io_signature (1, 1, sizeof (float)),
48 gr_bytes_to_syms::work (int noutput_items,
49 gr_vector_const_void_star &input_items,
50 gr_vector_void_star &output_items)
52 const unsigned char *in = (unsigned char *) input_items[0];
53 float *out = (float *) output_items[0];
55 assert (noutput_items % BITS_PER_BYTE == 0);
57 for (int i = 0; i < noutput_items / BITS_PER_BYTE; i++){
60 *out++ = (((x >> 7) & 0x1) << 1) - 1;
61 *out++ = (((x >> 6) & 0x1) << 1) - 1;
62 *out++ = (((x >> 5) & 0x1) << 1) - 1;
63 *out++ = (((x >> 4) & 0x1) << 1) - 1;
64 *out++ = (((x >> 3) & 0x1) << 1) - 1;
65 *out++ = (((x >> 2) & 0x1) << 1) - 1;
66 *out++ = (((x >> 1) & 0x1) << 1) - 1;
67 *out++ = (((x >> 0) & 0x1) << 1) - 1;