3 * Copyright 2002 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.
24 * FIXME. This code is virtually identical to qa_gr_fir_?CC.cc
25 * Kludge up some kind of macro to handle the minor differences.
35 typedef gr_complex o_type;
36 typedef gr_complex tap_type;
37 typedef gr_complex acc_type;
40 #include <qa_gr_fir_scc.h>
41 #include <gr_fir_scc.h>
42 #include <gr_fir_util.h>
47 #include <cppunit/TestAssert.h>
52 #define ERR_DELTA (1e-5)
54 #define NELEM(x) (sizeof (x) / sizeof (x[0]))
57 // typedef for something logically "pointer to constructor".
58 // there may be a better way, please let me know...
60 typedef gr_fir_scc* (*fir_maker_t)(const std::vector<tap_type> &taps);
66 return 2.0 * ((float) random () / RANDOM_MAX - 0.5); // uniformly (-1, 1)
70 random_input (i_type *buf, unsigned n)
72 for (unsigned i = 0; i < n; i++)
73 buf[i] = (i_type) rint (uniform () * 32767);
77 random_complex (gr_complex *buf, unsigned n)
79 for (unsigned i = 0; i < n; i++){
80 float re = rint (uniform () * 32767);
81 float im = rint (uniform () * 32767);
82 buf[i] = gr_complex (re, im);
87 ref_dotprod (const i_type input[], const tap_type taps[], int ntaps)
90 for (int i = 0; i < ntaps; i++)
91 sum += (float) input[i] * taps[ntaps - i - 1];
97 // Test for ntaps in [0,9], and input lengths in [0,17].
98 // This ensures that we are building the shifted taps correctly,
99 // and exercises all corner cases on input alignment and length.
103 test_random_io (fir_maker_t maker)
105 const int MAX_TAPS = 9;
106 const int OUTPUT_LEN = 17;
107 const int INPUT_LEN = MAX_TAPS + OUTPUT_LEN;
109 i_type input[INPUT_LEN];
110 o_type expected_output[OUTPUT_LEN];
111 o_type actual_output[OUTPUT_LEN];
112 tap_type taps[MAX_TAPS];
115 srandom (0); // we want reproducibility
117 for (int n = 0; n <= MAX_TAPS; n++){
118 for (int ol = 0; ol <= OUTPUT_LEN; ol++){
120 // cerr << "@@@ n:ol " << n << ":" << ol << endl;
122 // build random test case
123 random_input (input, INPUT_LEN);
124 random_complex (taps, MAX_TAPS);
126 // compute expected output values
127 for (int o = 0; o < ol; o++){
128 expected_output[o] = ref_dotprod (&input[o], taps, n);
133 vector<tap_type> f1_taps (&taps[0], &taps[n]);
134 gr_fir_scc *f1 = maker (f1_taps);
136 // zero the output, then do the filtering
137 memset (actual_output, 0, sizeof (actual_output));
138 f1->filterN (actual_output, input, ol);
142 // we use a sloppy error margin because on the x86 architecture,
143 // our reference implementation is using 80 bit floating point
144 // arithmetic, while the SSE version is using 32 bit float point
147 for (int o = 0; o < ol; o++){
148 CPPUNIT_ASSERT_COMPLEXES_EQUAL(expected_output[o],
150 abs (expected_output[o]) * ERR_DELTA);
159 for_each (void (*f)(fir_maker_t))
161 std::vector<gr_fir_scc_info> info;
162 gr_fir_util::get_gr_fir_scc_info (&info); // get all known scc implementations
164 for (std::vector<gr_fir_scc_info>::iterator p = info.begin ();
168 std::cerr << " [" << p->name << "]";
172 std::cerr << std::endl;
178 for_each (test_random_io);