126 lines
3.2 KiB
C++
126 lines
3.2 KiB
C++
/* Copyright 2016, Ableton AG, Berlin. All rights reserved.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* If you would like to incorporate Link into a proprietary software application,
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* please contact <link-devs@ableton.com>.
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*/
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#pragma once
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#include <ableton/link/Beats.hpp>
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#include <chrono>
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namespace ableton
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{
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namespace link
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{
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struct Tempo
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{
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Tempo() = default;
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// Beats per minute
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explicit Tempo(const double bpm)
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: mValue(bpm)
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{
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}
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Tempo(const std::chrono::microseconds microsPerBeat)
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: mValue(60. * 1e6 / static_cast<double>(microsPerBeat.count()))
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{
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}
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double bpm() const
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{
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return mValue;
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}
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std::chrono::microseconds microsPerBeat() const
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{
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return std::chrono::microseconds{std::llround(60. * 1e6 / bpm())};
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}
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// Given the tempo, convert a time to a beat value
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Beats microsToBeats(const std::chrono::microseconds micros) const
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{
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return Beats{
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static_cast<double>(micros.count()) / static_cast<double>(microsPerBeat().count())};
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}
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// Given the tempo, convert a beat to a time value
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std::chrono::microseconds beatsToMicros(const Beats beats) const
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{
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return std::chrono::microseconds{
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std::llround(beats.floating() * static_cast<double>(microsPerBeat().count()))};
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}
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// Model the NetworkByteStreamSerializable concept
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friend std::uint32_t sizeInByteStream(const Tempo tempo)
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{
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return discovery::sizeInByteStream(tempo.microsPerBeat());
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}
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template <typename It>
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friend It toNetworkByteStream(const Tempo tempo, It out)
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{
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return discovery::toNetworkByteStream(tempo.microsPerBeat(), std::move(out));
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}
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template <typename It>
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static std::pair<Tempo, It> fromNetworkByteStream(It begin, It end)
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{
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auto result =
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discovery::Deserialize<std::chrono::microseconds>::fromNetworkByteStream(
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std::move(begin), std::move(end));
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return std::make_pair(Tempo{std::move(result.first)}, std::move(result.second));
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}
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friend bool operator==(const Tempo lhs, const Tempo rhs)
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{
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return lhs.mValue == rhs.mValue;
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}
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friend bool operator!=(const Tempo lhs, const Tempo rhs)
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{
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return lhs.mValue != rhs.mValue;
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}
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friend bool operator<(const Tempo lhs, const Tempo rhs)
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{
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return lhs.mValue < rhs.mValue;
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}
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friend bool operator>(const Tempo lhs, const Tempo rhs)
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{
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return lhs.mValue > rhs.mValue;
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}
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friend bool operator<=(const Tempo lhs, const Tempo rhs)
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{
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return lhs.mValue <= rhs.mValue;
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}
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friend bool operator>=(const Tempo lhs, const Tempo rhs)
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{
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return lhs.mValue >= rhs.mValue;
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}
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private:
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double mValue = 0;
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};
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} // namespace link
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} // namespace ableton
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