47 lines
1.5 KiB
C++
47 lines
1.5 KiB
C++
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// tests/cpp/test_dsp_pitch_shift.cpp — pitch shifter sanity.
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//
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// Without a full FFT, we test:
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// - Output is finite for arbitrary input.
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// - Identity-shift (0 semitones) preserves rough RMS of a sine.
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// - Output remains bounded for large inputs.
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#include <cmath>
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#include "test_helpers.hpp"
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#include "../../nisps/dsp/pitch_shift.hpp"
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NISPS_TEST(pitch_shifter_finite_output) {
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nisps::PitchShifter<8192> ps;
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ps.init(48000.f);
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ps.set_transposition(7.f); // up a perfect fifth
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for (int n = 0; n < 20000; ++n) {
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const float x = std::sin(2.f * 3.14159265f * 440.f * n / 48000.f);
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const float y = ps.process(x);
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NISPS_EXPECT(std::isfinite(y));
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NISPS_EXPECT(std::fabs(y) < 5.f);
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}
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}
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NISPS_TEST(pitch_shifter_zero_input_gives_zero_output) {
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nisps::PitchShifter<8192> ps;
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ps.init(48000.f);
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ps.set_transposition(0.f);
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// Run 8192 samples to flush startup, then check zero-in → zero-out.
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for (int n = 0; n < 16384; ++n) ps.process(0.f);
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for (int n = 0; n < 1000; ++n) {
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const float y = ps.process(0.f);
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NISPS_EXPECT(std::fabs(y) < 1e-4f);
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}
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}
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NISPS_TEST(pitch_shifter_ratio_changes) {
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nisps::PitchShifter<8192> ps;
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ps.init(48000.f);
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ps.set_transposition(0.f);
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NISPS_EXPECT_NEAR(ps.ratio(), 1.f, 1e-5);
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ps.set_transposition(12.f); // octave up
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NISPS_EXPECT_NEAR(ps.ratio(), 2.f, 1e-3);
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ps.set_transposition(-12.f);
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NISPS_EXPECT_NEAR(ps.ratio(), 0.5f, 1e-3);
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}
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