Function FL_TEST_FILE

tests/fl/audio/deficiencies.cpp:29–323

#include "fl/math/math.h"

FL_TEST_FILE(FL_FILEPATH) {

using namespace fl;
using Diag = fl::audio::detector::VocalDetectorDiagnostics;
using fl::audio::test::makeSample;
using fl::audio::test::generateDC;
using fl::audio::test::generateSine;

namespace {

constexpr float PI = 3.14159265358979f;

} // anonymous namespace

// =============================================================================
// 1. Signal conditioning SHOULD be enabled by default
// =============================================================================
// A user who creates an audio::Processor and calls update() should get
// conditioned audio (DC removed, spikes filtered) without needing to know
// about setSignalConditioningEnabled(). MEMS microphones like the INMP441
// always have DC offset and occasional I2S glitches.

FL_TEST_CASE("Audio fix - DC offset removed by default") {
    audio::Processor processor;

    // Sample with large DC offset (3000) — common with INMP441 MEMS mic
    vector<i16> pcm;
    generateSine(pcm, 512, 440.0f, 44100.0f, 5000);
    // Add DC offset
    for (auto& sample : pcm) {
        i32 val = static_cast<i32>(sample) + 3000;
        sample = static_cast<i16>(fl::max(-32768, fl::min(32767, val)));
    }

    processor.update(makeSample(pcm, 1000));

    // Measure DC offset of the sample that reached detector
    const auto &processed = processor.getSample().pcm();
    i64 sum = 0;
    for (size i = 0; i < processed.size(); ++i) {
        sum += processed[i];
    }
    float meanDC =
        static_cast<float>(sum) / static_cast<float>(processed.size());

    // DESIRED: DC offset should be removed — mean should be near zero
    FL_CHECK_LT(fl::abs(meanDC), 500.0f);
}

FL_TEST_CASE("Audio fix - I2S spike filtered by default") {
    audio::Processor processor;

    // Sample with a large spike (I2S glitch)
    vector<i16> pcm;
    generateDC(pcm, 512, 0);
    pcm[100] = 30000; // spike well above normal signal range

    processor.update(makeSample(pcm, 1000));