SquareGameLiberationFront/F.E.I.S
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Still WIP implementing the BPM detection alg

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This commit is contained in:
Stepland 2023-07-04 01:38:10 +02:00
parent f74ad4d701
commit b494e3a356
1 changed files with 30 additions and 2 deletions
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32
src/guess_tempo.cpp
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@ -20,6 +20,7 @@
#include "Eigen/src/Core/Array.h"
#include "aubio_cpp.hpp"
#include "special_numeric_types.hpp"
std::vector<float> guess_tempo(const std::filesystem::path& path) {
feis::InputSoundFile music;
@ -54,9 +55,36 @@ void estimate_bpm(const std::set<std::size_t>& onsets, const std::size_t sample_
std::sort(
candidates.begin(),
candidates.end(),
[](const IntervalFitness& a, const IntervalFitness& b){return a.fitness > b.fitness;}
[](const IntervalFitness& a, const IntervalFitness& b){return a.fitness < b.fitness;}
);
std::vector<IntervalFitness>
// remove multiples
std::vector<IntervalFitness> deduped_candidates;
while (not candidates.empty()) {
deduped_candidates.push_back(candidates.back());
candidates.pop_back();
const auto reference_interval = deduped_candidates.back().interval;
const Fraction reference_bpm = Fraction{60 * sample_rate} / Fraction{reference_interval};
std::erase_if(candidates, [&](const IntervalFitness& f){
const Fraction potential_multiple = round_fraction(Fraction(reference_interval, f.interval));
const Fraction candidate_bpm = Fraction{60 * sample_rate} / Fraction{f.interval};
Fraction diff = (reference_bpm * potential_multiple) - candidate_bpm;
if (diff < 0) {
diff *= -1;
}
return diff < 0.1f;
});
}
for (const auto& candidate: deduped_candidates) {
const Fraction bpm = Fraction{60 * sample_rate} / Fraction{candidate.interval};
const Fraction rounded_bpm = round_fraction(bpm);
Fraction diff = bpm - rounded_bpm;
if (diff < 0) {
diff *= -1;
}
if (diff < 0.05f) {
}
}
}
std::set<std::size_t> detect_onsets(feis::InputSoundFile& music) {