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meshulameshula
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initial toy
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‎CMakeLists.txt

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cmake_minimum_required (VERSION 3.4)
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project(LabSynthToy)
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# Don't report that sample file installation up to date
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set(CMAKE_INSTALL_MESSAGE LAZY)
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set(LABSYNTHTOY_ROOT ${CMAKE_CURRENT_SOURCE_DIR})
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configure_file("${LABSYNTHTOY_ROOT}/LabSynthToy.config.h" "${LABSYNTHTOY_ROOT}/LabSynthToy.h" @ONLY)
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add_subdirectory(LabSound)
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if (APPLE)
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set(PLATFORM_LIBS
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"-framework AudioToolbox"
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"-framework AudioUnit"
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"-framework Accelerate"
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"-framework Cocoa"
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"-framework CoreAudio"
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# "-framework Metal"
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# "-framework MetalKit"
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# "-framework QuartzCore"
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)
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endif()
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add_executable(LabSynthToy
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TinySoundFont/tml.h
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TinySoundFont/tsf.h
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TinySoundFontNode.h
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TinySoundFontNode.cpp
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LabSoundTemplateNode.h
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LabSoundTemplateNode.cpp
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LabSynthToy.cpp)
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target_link_libraries(LabSynthToy Lab::Sound ${PLATFORM_LIBS})
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target_include_directories(LabSynthToy PRIVATE "${LABSYNTHTOY_ROOT}")
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install(TARGETS LabSynthToy RUNTIME DESTINATION bin)
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install(FILES
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"${LABSYNTHTOY_ROOT}/TinySoundFont/examples/florestan-subset.sf2"
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"${LABSYNTHTOY_ROOT}/TinySoundFont/examples/venture.mid"
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DESTINATION share/LabSynthToy)

‎LabSoundTemplateNode.cpp

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#include "LabSoundTemplateNode.h"
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#include <LabSound/core/AudioBus.h>
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#include <LabSound/core/AudioContext.h>
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#include <LabSound/core/AudioNodeOutput.h>
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#include <LabSound/extended/AudioContextLock.h>
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#include <LabSound/extended/Registry.h>
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#include "concurrentqueue.h"
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#include <algorithm>
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#include <queue>
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using namespace lab;
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struct LabSoundTemplateNodeEvent
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{
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double when;
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int id;
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bool operator<(const LabSoundTemplateNodeEvent& rhs) const
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{
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if (when > rhs.when)
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return true;
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if (when < rhs.when)
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return false;
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return id > rhs.id;
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}
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};
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struct LabSoundTemplateNode::Detail
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{
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std::priority_queue<LabSoundTemplateNodeEvent> queue;
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moodycamel::ConcurrentQueue<LabSoundTemplateNodeEvent> incoming;
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lab::AudioContext* ac = nullptr;
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Detail() = default;
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~Detail() = default;
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void clearSchedules()
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{
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LabSoundTemplateNodeEvent s;
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while (incoming.try_dequeue(s)) {}
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while (!queue.empty())
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queue.pop();
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}
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};
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LabSoundTemplateNode::LabSoundTemplateNode(AudioContext& ac)
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: AudioNode(ac)
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, _detail(new Detail())
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{
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_detail->ac = &ac;
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addOutput(std::unique_ptr<AudioNodeOutput>(new AudioNodeOutput(this, 1)));
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if (s_registered)
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initialize();
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}
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bool LabSoundTemplateNode::s_registered = NodeRegistry::Register(LabSoundTemplateNode::static_name(),
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[](AudioContext& ac)->AudioNode* { return new LabSoundTemplateNode(ac); },
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[](AudioNode* n) { delete n; });
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LabSoundTemplateNode::~LabSoundTemplateNode()
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{
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_detail->clearSchedules();
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uninitialize();
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delete _detail;
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}
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void LabSoundTemplateNode::realtimeEvent(float when, int identifier)
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{
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double now = _detail->ac->currentTime();
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_detail->incoming.enqueue({when + now, identifier});
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}
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void LabSoundTemplateNode::process(ContextRenderLock &r, int bufferSize)
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{
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AudioBus * outputBus = output(0)->bus(r);
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if (!isInitialized())
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{
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if (outputBus)
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outputBus->zero();
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_detail->clearSchedules();
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return;
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}
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// move incoming commands to the internal schedule
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{
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LabSoundTemplateNodeEvent s;
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while (_detail->incoming.try_dequeue(s))
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{
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_detail->queue.push(s);
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}
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}
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auto& ac = *r.context();
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double quantumStart = ac.currentTime();
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double quantumEnd = quantumStart + (double) bufferSize / ac.sampleRate();
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// any events to service now?
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int events = 0;
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outputBus->zero();
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while (!_detail->queue.empty() && _detail->queue.top().when < quantumEnd)
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{
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auto& top = _detail->queue.top();
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// compute the exact sample the event occurs at
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int offset = (top.when < quantumStart) ? 0 : static_cast<int>((top.when - quantumStart) * ac.sampleRate());
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// sanity to guard against rounding problems
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if (offset > bufferSize - 1)
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offset = bufferSize - 1;
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// make a little popping sound
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float* data = outputBus->channel(0)->mutableData();
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for (int i = std::max(0, offset - 4); i < std::min(offset + 4, bufferSize); ++i)
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data[i] = 1;
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_detail->queue.pop();
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++events;
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}
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if (events > 0)
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outputBus->clearSilentFlag();
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}
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void LabSoundTemplateNode::reset(ContextRenderLock&)
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{
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_detail->clearSchedules();
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}

‎LabSoundTemplateNode.h

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#ifndef LABSOUND_TEMPLATE_NODE
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#define LABSOUND_TEMPLATE_NODE
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#include <LabSound/core/AudioNode.h>
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class LabSoundTemplateNode : public lab::AudioNode
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{
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struct Detail;
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Detail* _detail = nullptr;
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static bool s_registered;
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public:
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LabSoundTemplateNode(lab::AudioContext & ac);
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virtual ~LabSoundTemplateNode();
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static const char* static_name() { return "LabSoundTemplateNode"; }
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virtual const char* name() const override { return static_name(); }
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// AudioNode
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virtual void process(lab::ContextRenderLock &, int bufferSize) override;
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virtual void reset(lab::ContextRenderLock &) override;
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void realtimeEvent(float when, int identifier);
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private:
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virtual bool propagatesSilence(lab::ContextRenderLock& r) const override { return false; }
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virtual double tailTime(lab::ContextRenderLock & r) const override { return 0; }
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virtual double latencyTime(lab::ContextRenderLock & r) const override { return 0; }
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};
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#endif

‎LabSynthToy.config.h

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#ifndef LABSYNTHTOYCONFIG_H
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#define LABSYNTHTOYCONFIG_H
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const char* synth_toy_asset_base = "@CMAKE_INSTALL_PREFIX@/share/LabSynthToy/";
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#endif

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