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falkTX
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Import initial code
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Diff for: ‎hylia.cpp

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/*
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* This file is part of Hylia.
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*
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* Hylia 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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* Hylia 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 Hylia. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "mod-link.h"
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#include "AudioEngine.hpp"
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#include "ableton/link/HostTimeFilter.hpp"
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#include <chrono>
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class HyliaTransport {
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public:
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HyliaTransport(double bpm, double bufferSize, double sampleRate)
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: link(bpm),
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engine(link),
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outputLatency(0),
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sampleTime(0)
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{
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outputLatency = std::chrono::microseconds(llround(1.0e6 * bufferSize / sampleRate));
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}
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void setEnabled(bool enabled, double bpm)
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{
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link.enable(enabled);
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if (enabled)
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{
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sampleTime = 0;
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engine.setTempo(bpm);
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}
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}
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void setTempo(double tempo)
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{
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engine.setTempo(tempo);
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}
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void process(uint32_t frames, LinkTimeInfo* info)
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{
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const auto hostTime = hostTimeFilter.sampleTimeToHostTime(sampleTime);
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const auto bufferBeginAtOutput = hostTime + outputLatency;
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engine.timelineCallback(bufferBeginAtOutput, info);
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sampleTime += frames;
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}
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private:
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ableton::Link link;
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ableton::linkaudio::AudioEngine engine;
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ableton::link::HostTimeFilter<ableton::platforms::stl::Clock> hostTimeFilter;
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std::chrono::microseconds outputLatency;
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uint32_t sampleTime;
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};
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hylia_t* hylia_create(double bpm, uint32_t buffer_size, uint32_t sample_rate)
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{
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HyliaTransport* t;
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try {
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t = new HyliaTransport(bpm, buffer_size, sample_rate);
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} catch (...) {
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return nullptr;
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}
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return (hylia_t*)t;
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}
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void hylia_enable(hylia_t* link, bool on, double bpm)
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{
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((HyliaTransport*)link)->setEnabled(on, bpm);
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}
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void hylia_set_tempo(hylia_t* link, double bpm)
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{
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((HyliaTransport*)link)->setTempo(bpm);
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}
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void hylia_process(hylia_t* link, uint32_t frames, hylia_time_info_t* info)
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{
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((HyliaTransport*)link)->process(frames, (LinkTimeInfo*)info);
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}
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void hylia_cleanup(hylia_t* link)
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{
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delete (HyliaTransport*)link;
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}
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#include "AudioEngine.cpp"

Diff for: ‎hylia.h

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/*
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* This file is part of Hylia.
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*
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* Hylia 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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* Hylia 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 Hylia. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef MOD_LINK_H_INCLUDED
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#define MOD_LINK_H_INCLUDED
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#else
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#include <stdbool.h>
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#endif
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typedef struct _hylia_t hylia_t;
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typedef struct _hylia_time_info_t {
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double bpm, beats, phase;
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} hylia_time_info_t;
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hylia_t* hylia_create(double bpm, uint32_t buffer_size, uint32_t sample_rate);
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void hylia_enable(hylia_t* link, bool on, double bpm);
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void hylia_process(hylia_t* link, uint32_t frames, hylia_time_info_t* info);
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void hylia_set_tempo(hylia_t* link, double tempo);
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void hylia_cleanup(hylia_t* link);
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#ifdef __cplusplus
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}
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#endif
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#endif // MOD_LINK_H_INCLUDED

Diff for: ‎link/AudioEngine.cpp

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/* 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
11+
* 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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#include "AudioEngine.hpp"
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// Make sure to define this before <cmath> is included for Windows
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#define _USE_MATH_DEFINES
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#include <cmath>
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namespace ableton
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{
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namespace linkaudio
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{
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AudioEngine::AudioEngine(Link& link)
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: mLink(link)
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, mSharedEngineData({0., false, 4.})
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{
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}
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double AudioEngine::beatTime() const
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{
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const auto timeline = mLink.captureAppTimeline();
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return timeline.beatAtTime(mLink.clock().micros(), mSharedEngineData.quantum);
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}
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void AudioEngine::setTempo(double tempo)
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{
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std::lock_guard<std::mutex> lock(mEngineDataGuard);
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mSharedEngineData.requestedTempo = tempo;
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}
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double AudioEngine::quantum() const
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{
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return mSharedEngineData.quantum;
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}
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void AudioEngine::setQuantum(double quantum)
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{
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std::lock_guard<std::mutex> lock(mEngineDataGuard);
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mSharedEngineData.quantum = quantum;
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mSharedEngineData.resetBeatTime = true;
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}
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AudioEngine::EngineData AudioEngine::pullEngineData()
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{
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auto engineData = EngineData{};
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if (mEngineDataGuard.try_lock())
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{
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engineData.requestedTempo = mSharedEngineData.requestedTempo;
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mSharedEngineData.requestedTempo = 0;
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engineData.resetBeatTime = mSharedEngineData.resetBeatTime;
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engineData.quantum = mSharedEngineData.quantum;
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mSharedEngineData.resetBeatTime = false;
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mEngineDataGuard.unlock();
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}
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return engineData;
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}
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void AudioEngine::timelineCallback(const std::chrono::microseconds hostTime, LinkTimeInfo* const info)
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{
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const auto engineData = pullEngineData();
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auto timeline = mLink.captureAudioTimeline();
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if (engineData.resetBeatTime)
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{
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// Reset the timeline so that beat 0 lands at the beginning of
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// this buffer and clear the flag.
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timeline.requestBeatAtTime(0, hostTime, engineData.quantum);
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}
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if (engineData.requestedTempo > 0)
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{
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// Set the newly requested tempo from the beginning of this buffer
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timeline.setTempo(engineData.requestedTempo, hostTime);
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}
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// Timeline modifications are complete, commit the results
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mLink.commitAudioTimeline(timeline);
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// Save timeline info
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info->bpm = timeline.tempo();
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info->beats = timeline.beatAtTime(hostTime, engineData.quantum);
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info->phase = timeline.phaseAtTime(hostTime, engineData.quantum);
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}
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} // namespace linkaudio
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} // namespace ableton

Diff for: ‎link/AudioEngine.hpp

+66
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@@ -0,0 +1,66 @@
1+
/* 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
4+
* it under the terms of the GNU General Public License as published by
5+
* the Free Software Foundation, either version 2 of the License, or
6+
* (at your option) any later version.
7+
*
8+
* This program is distributed in the hope that it will be useful,
9+
* but WITHOUT ANY WARRANTY; without even the implied warranty of
10+
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11+
* GNU General Public License for more details.
12+
*
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* You should have received a copy of the GNU General Public License
14+
* along with this program. If not, see <http://www.gnu.org/licenses/>.
15+
*
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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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// Make sure to define this before <cmath> is included for Windows
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#define _USE_MATH_DEFINES
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#include "ableton/Link.hpp"
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#include <mutex>
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struct LinkTimeInfo {
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double bpm, beats, phase;
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};
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namespace ableton
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{
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namespace linkaudio
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{
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class AudioEngine
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{
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public:
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AudioEngine(Link& link);
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double beatTime() const;
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void setTempo(double tempo);
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double quantum() const;
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void setQuantum(double quantum);
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void timelineCallback(const std::chrono::microseconds hostTime, LinkTimeInfo* const info);
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private:
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struct EngineData
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{
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double requestedTempo;
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bool resetBeatTime;
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double quantum;
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};
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EngineData pullEngineData();
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Link& mLink;
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EngineData mSharedEngineData;
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std::mutex mEngineDataGuard;
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friend class AudioPlatform;
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};
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} // namespace linkaudio
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} // namespace ableton

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