Chris@118: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@110: 
Chris@110: #include "base/Window.h"
Chris@110: 
Chris@110: #include <iostream>
Chris@110: 
Chris@110: #define BOOST_TEST_DYN_LINK
Chris@110: #define BOOST_TEST_MAIN
Chris@110: 
Chris@110: #include <boost/test/unit_test.hpp>
Chris@110: 
Chris@110: BOOST_AUTO_TEST_SUITE(TestWindow)
Chris@110: 
Chris@110: using std::cout;
Chris@110: using std::endl;
Chris@110: 
Chris@110: #define COMPARE_ARRAY(a, b)						\
Chris@110:     for (int cmp_i = 0; cmp_i < (int)(sizeof(a)/sizeof(a[0])); ++cmp_i) { \
Chris@110:         BOOST_CHECK_SMALL(a[cmp_i] - b[cmp_i], 1e-4);			\
Chris@110:     }
Chris@110: 
Chris@110: void
Chris@110: testSymmetric(double *d, int n)
Chris@110: {
Chris@110:     for (int i = 0; i <= n/2; ++i) {
Chris@110: 	BOOST_CHECK_CLOSE(d[i], d[n-i-1], 1e-10);
Chris@110:     }
Chris@110: }
Chris@110: 
Chris@110: BOOST_AUTO_TEST_CASE(periodic)
Chris@110: {
Chris@110:     // We can't actually test whether a function is periodic, given
Chris@110:     // only one cycle of it! But we can make sure that all but the
Chris@110:     // first sample is symmetric, which is what a symmetric window
Chris@110:     // becomes when generated in periodic mode
Chris@110:     double d[9];
Chris@110:     for (int n = 8; n <= 9; ++n) {
Chris@110: 	for (int wt = (int)FirstWindow; wt <= (int)LastWindow; ++wt) {
Chris@110: 	    for (int i = 0; i < n; ++i) d[i] = 1.0;
Chris@110: 	    Window<double> w((WindowType)wt, n);
Chris@110: 	    w.cut(d);
Chris@110: 	    testSymmetric(d + 1, n - 1);
Chris@110: 	}
Chris@110:     }
Chris@110: }
Chris@110: 
Chris@110: template <int N>
Chris@110: void testWindow(WindowType type, const double expected[N])
Chris@110: {
Chris@110:     double d[N];
Chris@110:     for (int i = 0; i < N; ++i) d[i] = 1.0;
Chris@110:     Window<double> w(type, N);
Chris@110:     w.cut(d);
Chris@110:     COMPARE_ARRAY(d, expected);
Chris@111: 
Chris@111:     double d0[N], d1[N];
Chris@111:     for (int i = 0; i < N; ++i) d0[i] = 0.5 + (1.0 / (N * 2)) * (i + 1);
Chris@111:     w.cut(d0, d1);
Chris@111:     for (int i = 0; i < N; ++i) {
Chris@111: 	BOOST_CHECK_SMALL(d1[i] - d0[i] * expected[i], 1e-4);
Chris@111:     }
Chris@110: }
Chris@110: 
Chris@110: BOOST_AUTO_TEST_CASE(bartlett)
Chris@110: {
Chris@110:     double e1[] = { 1 };
Chris@110:     testWindow<1>(BartlettWindow, e1);
Chris@110: 
Chris@110:     double e2[] = { 0, 0 };
Chris@110:     testWindow<2>(BartlettWindow, e2);
Chris@110: 
Chris@110:     double e3[] = { 0, 2./3., 2./3. };
Chris@110:     testWindow<3>(BartlettWindow, e3);
Chris@110: 
Chris@110:     double e4[] = { 0, 1./2., 1., 1./2. };
Chris@110:     testWindow<4>(BartlettWindow, e4);
Chris@110: 
Chris@110:     double e5[] = { 0, 1./2., 1., 1., 1./2. };
Chris@110:     testWindow<5>(BartlettWindow, e5);
Chris@110: 
Chris@110:     double e6[] = { 0, 1./3., 2./3., 1., 2./3., 1./3. };
Chris@110:     testWindow<6>(BartlettWindow, e6);
Chris@110: }
Chris@110:     
Chris@110: BOOST_AUTO_TEST_CASE(hamming)
Chris@110: {
Chris@110:     double e1[] = { 1 };
Chris@110:     testWindow<1>(HammingWindow, e1);
Chris@110: 
Chris@110:     double e10[] = {
Chris@110: 	0.0800, 0.1679, 0.3979, 0.6821, 0.9121,
Chris@110:         1.0000, 0.9121, 0.6821, 0.3979, 0.1679
Chris@110:     };
Chris@110:     testWindow<10>(HammingWindow, e10);
Chris@110: }
Chris@110:     
Chris@110: BOOST_AUTO_TEST_CASE(hann)
Chris@110: {
Chris@110:     double e1[] = { 1 };
Chris@110:     testWindow<1>(HanningWindow, e1);
Chris@110: 
Chris@110:     double e10[] = {
Chris@110:         0, 0.0955, 0.3455, 0.6545, 0.9045,
Chris@110:         1.0000, 0.9045, 0.6545, 0.3455, 0.0955,
Chris@110:     };
Chris@110:     testWindow<10>(HanningWindow, e10);
Chris@110: }
Chris@110:     
Chris@110: BOOST_AUTO_TEST_CASE(blackman)
Chris@110: {
Chris@110:     double e1[] = { 1 };
Chris@110:     testWindow<1>(BlackmanWindow, e1);
Chris@110: 
Chris@110:     double e10[] = {
Chris@110:         0, 0.0402, 0.2008, 0.5098, 0.8492,
Chris@110:         1.0000, 0.8492, 0.5098, 0.2008, 0.0402,
Chris@110:     };
Chris@110:     testWindow<10>(BlackmanWindow, e10);
Chris@110: }
Chris@110:     
Chris@110: BOOST_AUTO_TEST_SUITE_END()
Chris@110: