973455b158
Header-only, heap-free, sample-rate-aware DSP primitives for stream 3: - Biquad (LPF/HPF/BPF/Notch/Peak/LowShelf/HighShelf, denormal flush) - Delay<N> + DynamicDelay<N> (fixed-length feedback + power-of-two ring with fractional read & smoothed offset) - AllPass / Comb / LpComb (Schroeder-Moorer reverb sections, split per role rather than maximilian's one-class-many-roles maxiReverbFilters) - DCBlocker (one-pole HPF) - ChamberlinSVF + OnePoleSmoother<NCh> + EnvelopeFollower - ADSR envelope generator - SineOsc/SawOsc/SquareOsc, PAFOperator (port of maxiPAFOperator with static gauss/cauchy tables), FMOp single-operator FM building block - PitchShifter<N> granular two-head crossfade (replaces daisysp PitchShifter) Tests: biquad freq-domain attenuation, delay tap timing, reverb boundedness, pitch-shifter ratio + finite output. All pass under -Wall -Wextra -Werror -Wpedantic, C++20.
50 lines
1.5 KiB
C++
50 lines
1.5 KiB
C++
// tests/cpp/test_dsp_delay.cpp — verify delay-line tap timing.
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#include "test_helpers.hpp"
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#include "../../nisps/dsp/delay.hpp"
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NISPS_TEST(delay_outputs_zero_before_first_full_cycle) {
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nisps::Delay<128> dl;
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// First N samples (with size=64) should output zeros, since memory
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// starts at zero.
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for (int n = 0; n < 64; ++n) {
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const float y = dl.play(1.f, 64u, 0.f);
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NISPS_EXPECT(y == 0.f);
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}
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}
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NISPS_TEST(delay_recovers_input_after_size_samples) {
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nisps::Delay<128> dl;
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// Feed an impulse, then zeros. Read should produce the impulse 64
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// samples later.
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dl.play(1.f, 64u, 0.f);
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float impulse_seen_at = -1.f;
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for (int n = 1; n < 70; ++n) {
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const float y = dl.play(0.f, 64u, 0.f);
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if (y > 0.5f && impulse_seen_at < 0.f) {
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impulse_seen_at = static_cast<float>(n);
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}
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}
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// Should appear ~63 samples after the impulse was written.
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NISPS_EXPECT(impulse_seen_at >= 60.f && impulse_seen_at <= 67.f);
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}
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NISPS_TEST(dynamic_delay_smoothes_and_reads) {
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nisps::DynamicDelay<128> dd;
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dd.set_smooth_coeff(0.5f);
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for (int n = 0; n < 200; ++n) {
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dd.write(static_cast<float>(n));
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const float r = dd.read(50.f);
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NISPS_EXPECT(std::isfinite(r));
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}
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}
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NISPS_TEST(delay_clear_resets_buffer) {
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nisps::Delay<64> dl;
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for (int n = 0; n < 32; ++n) dl.play(0.5f, 32u, 0.f);
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dl.clear();
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for (int n = 0; n < 32; ++n) {
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const float y = dl.play(0.f, 32u, 0.f);
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NISPS_EXPECT(y == 0.f);
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}
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}
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