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/* Copyright 2016, Ableton AG, Berlin. All rights reserved.
*
* 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
// Make sure to define this before <cmath> is included for Windows
#define _USE_MATH_DEFINES
#include <ableton/Link.hpp>
#include <atomic>
#include <mutex>
namespace ableton
{
namespace linkaudio
{
class AudioEngine
{
public:
AudioEngine(Link& link);
void startPlaying();
void stopPlaying();
bool isPlaying() const;
double beatTime() const;
void setTempo(double tempo);
double quantum() const;
void setQuantum(double quantum);
bool isStartStopSyncEnabled() const;
void setStartStopSyncEnabled(bool enabled);
private:
struct EngineData
{
double requestedTempo;
bool requestStart;
bool requestStop;
double quantum;
bool startStopSyncOn;
};
void setBufferSize(std::size_t size);
void setSampleRate(double sampleRate);
EngineData pullEngineData();
void renderMetronomeIntoBuffer(Link::SessionState sessionState,
double quantum,
std::chrono::microseconds beginHostTime,
std::size_t numSamples);
void audioCallback(const std::chrono::microseconds hostTime, std::size_t numSamples);
Link& mLink;
double mSampleRate;
std::atomic<std::chrono::microseconds> mOutputLatency;
std::vector<double> mBuffer;
EngineData mSharedEngineData;
EngineData mLockfreeEngineData;
std::chrono::microseconds mTimeAtLastClick;
bool mIsPlaying;
std::mutex mEngineDataGuard;
friend class AudioPlatform;
};
} // namespace linkaudio
} // namespace ableton
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