L'électron rare
b8d76ccb27
Pure-C++ store that log-resamples both channels' FFT magnitudes into scrolling columns, CH1 north and CH2 south, high frequencies toward the poles. No GL dependency, fully unit-tested.
33 lines
1.1 KiB
C++
33 lines
1.1 KiB
C++
#include "check.h"
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#include "SpectrogramBuffer.h"
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#include <vector>
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using oscope::SpectrogramBuffer;
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// writeIndex advances modulo width.
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static void test_write_index_wraps() {
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SpectrogramBuffer buf(8, 4);
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std::vector<float> z(1024, 0.0f);
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for (int i = 0; i < 10; ++i) buf.pushColumn(z, z);
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CHECK(buf.writeIndex() == 2); // 10 % 8
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CHECK(static_cast<int>(buf.data().size()) == 8 * 4);
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}
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// High-frequency energy must land near the poles for both channels.
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static void test_high_freq_maps_to_poles() {
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SpectrogramBuffer buf(4, 8); // H=8 -> CH1 rows 4..7, CH2 rows 0..3
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std::vector<float> hi(1024, 0.0f);
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hi[1023] = 100.0f; // energy at the top FFT bin
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buf.pushColumn(hi, hi); // both channels: high-frequency content
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const std::vector<float>& d = buf.data();
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const int W = buf.width();
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CHECK(d[7 * W + 0] > d[4 * W + 0]); // CH1: north pole > equator
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CHECK(d[0 * W + 0] > d[3 * W + 0]); // CH2: south pole > equator
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}
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int main() {
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test_write_index_wraps();
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test_high_freq_maps_to_poles();
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REPORT();
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}
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