/usr/include/ableton/link/Tempo.hpp is in ableton-link-dev 1.0.0+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* If you would like to incorporate Link into a proprietary software application,
* please contact <link-devs@ableton.com>.
*/
#pragma once
#include <ableton/link/Beats.hpp>
#include <chrono>
namespace ableton
{
namespace link
{
struct Tempo : std::tuple<double>
{
Tempo() = default;
// Beats per minute
explicit Tempo(const double bpm)
: std::tuple<double>(bpm)
{
}
Tempo(const std::chrono::microseconds microsPerBeat)
: std::tuple<double>(60. * 1e6 / microsPerBeat.count())
{
}
double bpm() const
{
return std::get<0>(*this);
}
std::chrono::microseconds microsPerBeat() const
{
return std::chrono::microseconds{std::llround(60. * 1e6 / bpm())};
}
// Given the tempo, convert a time to a beat value
Beats microsToBeats(const std::chrono::microseconds micros) const
{
return Beats{micros.count() / static_cast<double>(microsPerBeat().count())};
}
// Given the tempo, convert a beat to a time value
std::chrono::microseconds beatsToMicros(const Beats beats) const
{
return std::chrono::microseconds{
std::llround(beats.floating() * microsPerBeat().count())};
}
// Model the NetworkByteStreamSerializable concept
friend std::uint32_t sizeInByteStream(const Tempo tempo)
{
return discovery::sizeInByteStream(tempo.microsPerBeat());
}
template <typename It>
friend It toNetworkByteStream(const Tempo tempo, It out)
{
return discovery::toNetworkByteStream(tempo.microsPerBeat(), std::move(out));
}
template <typename It>
static std::pair<Tempo, It> fromNetworkByteStream(It begin, It end)
{
auto result =
discovery::Deserialize<std::chrono::microseconds>::fromNetworkByteStream(
std::move(begin), std::move(end));
return std::make_pair(Tempo{std::move(result.first)}, std::move(result.second));
}
};
} // namespace link
} // namespace ableton
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