107 lines
2.0 KiB
C++
107 lines
2.0 KiB
C++
#include "tools/bpmcalculator.h"
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#include <cmath>
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#include <numeric>
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#include <iostream>
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BPMCalculator::BPMCalculator(const std::shared_ptr<Music>& music) :
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_music(music)
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{
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reset();
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}
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void BPMCalculator::reset()
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{
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_calculating = false;
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_deltas.clear();
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_previous_click_offset = 0;
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_first_click_offset = 0;
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_need_recalculate = true;
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}
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void BPMCalculator::setMusic(const std::shared_ptr<Music>& music)
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{
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_music = music;
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reset();
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}
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std::shared_ptr<Music> BPMCalculator::music() const
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{
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return _music;
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}
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void BPMCalculator::start()
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{
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reset();
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_calculating = true;
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}
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void BPMCalculator::stop()
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{
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_calculating = false;
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}
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bool BPMCalculator::calculating() const
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{
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return _calculating;
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}
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void BPMCalculator::click()
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{
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if (!_calculating)
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return;
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const microsec click_offset = _music->fetchOffset();
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_need_recalculate = true;
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if (_previous_click_offset == 0)
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{
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_previous_click_offset = click_offset;
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_first_click_offset = click_offset;
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return;
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}
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const microsec delta = click_offset - _previous_click_offset;
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_deltas.emplace_back(delta);
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_previous_click_offset = click_offset;
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}
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const beat_utils::BeatInfo& BPMCalculator::fetchApproximatedInfo()
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{
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if (!_need_recalculate)
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return _approximated_info;
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_need_recalculate = false;
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bool hasEnoughDeltas = _deltas.size() >= 8;
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_approximated_info = (!hasEnoughDeltas)
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? beat_utils::BeatInfo{}
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: beat_utils::calculateBeatRateInfo(_deltas);
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return _approximated_info;
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}
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microsec BPMCalculator::getStartingOffset() const
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{
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return _first_click_offset;
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}
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void BPMCalculator::setStartingOffset(microsec offset)
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{
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_first_click_offset = offset;
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}
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void BPMCalculator::moveStartingOffsetBy(microsec shift)
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{
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_first_click_offset += shift;
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}
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microsec BPMCalculator::fetchTimeUntilNextBeat()
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{
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const microsec actual_offset = _music->fetchOffset() - getStartingOffset();
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return actual_offset % fetchApproximatedInfo().interval;
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}
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