Chris@112: 
Chris@112: #include "dsp/phasevocoder/PhaseVocoder.h"
Chris@112: 
Chris@112: #include "base/Window.h"
Chris@112: 
Chris@112: #define BOOST_TEST_DYN_LINK
Chris@112: #define BOOST_TEST_MAIN
Chris@112: 
Chris@112: #include <boost/test/unit_test.hpp>
Chris@112: 
Chris@112: BOOST_AUTO_TEST_SUITE(TestFFT)
Chris@112: 
Chris@112: #define COMPARE_CONST(a, n) \
Chris@112:     for (int cmp_i = 0; cmp_i < (int)(sizeof(a)/sizeof(a[0])); ++cmp_i) { \
Chris@112:         BOOST_CHECK_SMALL(a[cmp_i] - n, 1e-14);				\
Chris@112:     }
Chris@112: 
Chris@112: #define COMPARE_ARRAY(a, b)						\
Chris@112:     for (int cmp_i = 0; cmp_i < (int)(sizeof(a)/sizeof(a[0])); ++cmp_i) { \
Chris@112:         BOOST_CHECK_SMALL(a[cmp_i] - b[cmp_i], 1e-14);			\
Chris@112:     }
Chris@112: 
Chris@112: #define COMPARE_ARRAY_EXACT(a, b)						\
Chris@112:     for (int cmp_i = 0; cmp_i < (int)(sizeof(a)/sizeof(a[0])); ++cmp_i) { \
Chris@112:         BOOST_CHECK_EQUAL(a[cmp_i], b[cmp_i]);			\
Chris@112:     }
Chris@112: 
Chris@112: BOOST_AUTO_TEST_CASE(fullcycle)
Chris@112: {
Chris@115:     // Cosine with one cycle exactly equal to pvoc hopsize. This is
Chris@115:     // pretty much the most trivial case -- in fact it's
Chris@115:     // indistinguishable from totally silent input (in the phase
Chris@115:     // values) because the measured phases are zero throughout.
Chris@115: 
Chris@115:     // We aren't windowing the input frame because (for once) it
Chris@115:     // actually *is* just a short part of a continuous infinite
Chris@115:     // sinusoid.
Chris@112: 
Chris@112:     double frame[] = { 1, 0, -1, 0, 1, 0, -1, 0 };
Chris@112: 
Chris@115:     PhaseVocoder pvoc(8, 4);
Chris@112: 
Chris@112:     // Make these arrays one element too long at each end, so as to
Chris@112:     // test for overruns. For frame size 8, we expect 8/2+1 = 5
Chris@112:     // mag/phase pairs.
Chris@112:     double mag[]   = { 999, 999, 999, 999, 999, 999, 999 };
Chris@112:     double phase[] = { 999, 999, 999, 999, 999, 999, 999 };
Chris@115:     double unw[]   = { 999, 999, 999, 999, 999, 999, 999 };
Chris@112: 
Chris@115:     pvoc.process(frame, mag + 1, phase + 1, unw + 1);
Chris@112: 
Chris@112:     double magExpected0[] = { 999, 0, 0, 4, 0, 0, 999 };
Chris@112:     COMPARE_ARRAY_EXACT(mag, magExpected0);
Chris@112: 
Chris@112:     double phaseExpected0[] = { 999, 0, 0, 0, 0, 0, 999 };
Chris@112:     COMPARE_ARRAY_EXACT(phase, phaseExpected0);
Chris@112: 
Chris@115:     double unwExpected0[] = { 999, 0, 0, 0, 0, 0, 999 };
Chris@115:     COMPARE_ARRAY(unw, unwExpected0);
Chris@115: 
Chris@115:     pvoc.process(frame, mag + 1, phase + 1, unw + 1);
Chris@112: 
Chris@112:     double magExpected1[] = { 999, 0, 0, 4, 0, 0, 999 };
Chris@112:     COMPARE_ARRAY_EXACT(mag, magExpected1);
Chris@112: 
Chris@115:     double phaseExpected1[] = { 999, 0, 0, 0, 0, 0, 999 };
Chris@112:     COMPARE_ARRAY(phase, phaseExpected1);
Chris@113: 
Chris@115:     // Derivation of values:
Chris@115:     // 
Chris@115:     // * Bin 0 (DC) always has phase 0 and expected phase 0
Chris@115:     //
Chris@115:     // * Bin 1 has expected phase pi (the hop size is half a cycle at
Chris@115:     //   its frequency), but measured phase 0 (because there is no
Chris@115:     //   signal in that bin). So it has phase error -pi, which is
Chris@115:     //   mapped into (-pi,pi] range as pi, giving an unwrapped phase
Chris@115:     //   of 2*pi.
Chris@115:     //  
Chris@115:     // * Bin 2 has expected unwrapped phase 2*pi, measured phase 0,
Chris@115:     //   hence error 0 and unwrapped phase 2*pi.
Chris@115:     //
Chris@115:     // * Bin 3 is like bin 1: it has expected phase 3*pi, measured
Chris@115:     //   phase 0, so phase error -pi and unwrapped phase 4*pi.
Chris@115:     //
Chris@115:     // * Bin 4 (Nyquist) is like bin 2: expected phase 4*pi, measured
Chris@115:     //   phase 0, hence error 0 and unwrapped phase 4*pi.
Chris@115: 
Chris@115:     double unwExpected1[] = { 999, 0, 2*M_PI, 2*M_PI, 4*M_PI, 4*M_PI, 999 };
Chris@115:     COMPARE_ARRAY(unw, unwExpected1);
Chris@115: 
Chris@115:     pvoc.process(frame, mag + 1, phase + 1, unw + 1);
Chris@113: 
Chris@113:     double magExpected2[] = { 999, 0, 0, 4, 0, 0, 999 };
Chris@113:     COMPARE_ARRAY_EXACT(mag, magExpected2);
Chris@113: 
Chris@115:     double phaseExpected2[] = { 999, 0, 0, 0, 0, 0, 999 };
Chris@113:     COMPARE_ARRAY(phase, phaseExpected2);
Chris@115: 
Chris@115:     double unwExpected2[] = { 999, 0, 4*M_PI, 4*M_PI, 8*M_PI, 8*M_PI, 999 };
Chris@115:     COMPARE_ARRAY(unw, unwExpected2);
Chris@112: }
Chris@112: 
Chris@115: //!!! signal that starts mid-phase
Chris@115: 
Chris@115: 
Chris@112: BOOST_AUTO_TEST_SUITE_END()
Chris@112: