add instrument factory

CMakeLists.txt

@@ -55,10 +55,11 @@ add_library(sonobulus_core STATIC
     src/synth/NoteQueue.cpp
     src/synth/Scope.cpp
     src/synth/Synth.cpp
-    src/synth/Voice.cpp
+    #src/synth/Voice.cpp
     src/synth/Filter.cpp
     src/synth/WavetableLoader.cpp
     src/synth/Envelope.cpp
+    src/synth/InstrumentFactory.cpp
     src/synth/instruments/Instrument.cpp
     src/synth/instruments/PianoString.cpp
     src/synth/instruments/WavetableOscillator.cpp

config/sonobulus.cfg

@@ -8,7 +8,7 @@ Logger = (
             "Info",
             "Warning",
             "Error"
-        );
+        ); # TODO: console flags vs file flags
 
         ShowTime = false;
         ShowSourceTrace = false;
@@ -35,6 +35,7 @@ AudioEngine = (
     }
 );
 
+# TODO: I don't like this being in the main config, maybe import it in (mainly the notes and keycodes)
 KeyboardController = (
     {
         Id = "Main";

src/main.cpp

@@ -50,4 +50,3 @@ int main(int argc, char* argv[]) {
     // execute app
     return app.exec();
 }
- 

src/synth/InstrumentFactory.cpp

@@ -0,0 +1,38 @@
+
+#include "InstrumentFactory.hpp"
+
+#include "Instruments/PianoString.hpp"
+#include "Instruments/WavetableOscillator.hpp"
+
+InstrumentFactory::InstrumentFactory(ConfigService* config, LoggerService* logger) : 
+    config_(config), logger_(logger) {
+
+}
+
+Instrument* InstrumentFactory::createInstrument(InstrumentType type, float sampleRate, AudioParams* params) {
+
+    switch(type) {
+        case InstrumentType::Default:
+            return new Instrument(config_, logger_, sampleRate, params);
+        case InstrumentType::PianoString:
+            return new PianoString(config_, logger_, sampleRate, params);
+        case InstrumentType::WavetableOscillator:
+            return new WavetableOscillator(config_, logger_, wavetableLoader_, sampleRate, params);
+        default:
+            return nullptr;
+    }
+}
+
+int32_t InstrumentFactory::createInstruments(std::vector<Instrument*>* instruments, size_t voiceCount, float sampleRate, AudioParams* params) {
+
+    // parse the config file
+    // if there's wavetables then we need a wavetable loader
+    // initialize wavetableLoader_ here
+
+    for(size_t i = 0; i < params->maxVoices; i++) {
+        instruments->push_back(createInstrument(InstrumentType::PianoString, static_cast<float>(params->sampleRate), params));
+    }
+
+    return params->maxVoices;
+
+}

src/synth/InstrumentFactory.hpp

@@ -0,0 +1,35 @@
+
+#pragma once
+
+#include "config/ConfigService.hpp"
+#include "config/AudioConfig.hpp"
+#include "LoggerService.hpp"
+#include "Instruments/Instrument.hpp"
+#include "WavetableLoader.hpp"
+
+class InstrumentFactory {
+
+public:
+
+    InstrumentFactory(ConfigService* config, LoggerService* logger);
+    ~InstrumentFactory() = default;
+
+    int32_t createInstruments(std::vector<Instrument*>* instruments, size_t voiceCount, float sampleRate, AudioParams* params);
+
+    enum class InstrumentType {
+        Default,
+        PianoString,
+        WavetableOscillator
+    };
+
+private:
+
+    Instrument* createInstrument(InstrumentType type, float sampleRate, AudioParams* params);
+
+    ConfigService* config_;
+    LoggerService* logger_;
+
+    // optional creators
+    WavetableLoader* wavetableLoader_ = nullptr;
+
+};

src/synth/Instruments/Instrument.cpp

@@ -3,8 +3,16 @@
 
 #include "string"
 
-Instrument::Instrument(ConfigService* config, LoggerService* logger, float sampleRate) :
-    config_(config), logger_(logger), sampleRate_(sampleRate) {
+Instrument::Instrument(ConfigService* config, LoggerService* logger, float sampleRate, AudioParams* params) :
+    config_(config), logger_(logger), sampleRate_(sampleRate), params_(params) {
+
+}
+
+void Instrument::startNote(uint8_t midiNote, float velocity) {
+
+    note_ = midiNote;
+
+    noteOn(noteToFrequency(midiNote), velocity);
 
 }
 

src/synth/Instruments/Instrument.hpp

@@ -3,6 +3,7 @@
 
 #include "config/ConfigService.hpp"
 #include "LoggerService.hpp"
+#include "config/AudioConfig.hpp"
 
 // an instrument is our state space model. it calculates discrete samples as a function of time, the current states, and the inputs
 // an instrument is owned by a voice
@@ -11,9 +12,10 @@ class Instrument {
 public:
 
     Instrument() = default;
-    Instrument(ConfigService* config, LoggerService* logger, float sampleRate);
+    Instrument(ConfigService* config, LoggerService* logger, float sampleRate, AudioParams* params);
     ~Instrument() = default;
 
+    void startNote(uint8_t midiNote, float velocity);
     virtual void noteOn(float frequency, float velocity);
     virtual void noteOff();
 
@@ -21,13 +23,23 @@ public:
 
     virtual float process(bool& scopeTrigger);
 
+    uint8_t note() { return note_; }
+    float frequency() { return noteToFrequency(note_); }
+
 protected:
 
+    inline float noteToFrequency(uint8_t note) {
+        return params_->pitchStandard * pow(params_->octaveConstant, static_cast<float>(note - params_->midiHome) / params_->notesPerOctave); 
+    }
+
     float sampleRate_ = 1.0f;
     bool active_ = false;
 
     ConfigService* config_;
     LoggerService* logger_;
+    AudioParams* params_;
+
+    uint8_t note_;
 
     static constexpr float pi = 3.14159265358979323846f;
     float phase_ = 0.0f;

src/synth/Instruments/PianoString.cpp

@@ -1,7 +1,7 @@
 
 #include "PianoString.hpp"
 
-PianoString::PianoString(ConfigService* config, LoggerService* logger, float sampleRate) : Instrument(config, logger, sampleRate) {
+PianoString::PianoString(ConfigService* config, LoggerService* logger, float sampleRate, AudioParams* params) : Instrument(config, logger, sampleRate, params) {
 
     stringY_current_.resize(segmentCount_ + 1);
     stringY_previous_.resize(segmentCount_ + 1);

src/synth/Instruments/PianoString.hpp

@@ -10,7 +10,7 @@ class PianoString : public Instrument {
 public:
 
     PianoString() = default;
-    PianoString(ConfigService* config, LoggerService* logger, float sampleRate);
+    PianoString(ConfigService* config, LoggerService* logger, float sampleRate, AudioParams* params);
     ~PianoString() = default;
     
     void noteOn(float frequency, float velocity) override;

src/synth/Instruments/WavetableOscillator.cpp

@@ -2,12 +2,17 @@
 #include "WavetableOscillator.hpp"
 
 
-WavetableOscillator::WavetableOscillator(ConfigService* config, LoggerService* logger, float sampleRate) {
+WavetableOscillator::WavetableOscillator(ConfigService* config, LoggerService* logger, WavetableLoader* wavetabler, float sampleRate, AudioParams* params) 
+    : Instrument(config, logger, sampleRate, params), wavetableLoader_(wavetabler) {
 
 }
 
 void WavetableOscillator::noteOn(float frequency, float velocity) {
     envelope_.noteOn(); // hmm we can scale this by velocity
+
+    frequency_ = frequency;
+    phaseIncrement_ = 2.0f * kPi_ * frequency_ / sampleRate_;
+    
 }
 
 void WavetableOscillator::noteOff() {
@@ -19,12 +24,18 @@ bool WavetableOscillator::isActive() {
 }
 
 float WavetableOscillator::process(bool& scopeTrigger) {
-    // return wavetable_.process() * envelope_.process();
-    // more like 
+
+    if(wavetableLoader_ == nullptr) {
         return 0.0f;
-}
+    }
 
-bool WavetableOscillator::loadWavetable(std::string filename) {
-    return false;
-}
+    float sampleOut = wavetableLoader_->sample(wavetableId_, phase_);
 
+    phase_ += phaseIncrement_;
+    if(phase_ > 2.0f * kPi_) {
+        phase_ -= 2.0f * kPi_;
+        scopeTrigger = true;
+    }
+
+    return sampleOut;
+}

src/synth/Instruments/WavetableOscillator.hpp

@@ -5,13 +5,14 @@
 
 #include "synth/instruments/Instrument.hpp"
 #include "synth/Envelope.hpp"
+#include "synth/WavetableLoader.hpp"
 
 class WavetableOscillator : public Instrument {
 
 public:
 
     WavetableOscillator() = default;
-    WavetableOscillator(ConfigService* config, LoggerService* logger, float sampleRate);
+    WavetableOscillator(ConfigService* config, LoggerService* logger, WavetableLoader* wavetabler, float sampleRate, AudioParams* params);
     ~WavetableOscillator() = default;
     
     void noteOn(float frequency, float velocity) override;
@@ -21,12 +22,19 @@ public:
 
     float process(bool& scopeTrigger) override;
 
+    bool setWavetableId(size_t id) { wavetableId_ = id; }
+
 private:
 
-    bool loadWavetable(std::string filename); // TODO: load from conf file instead
-
-    std::vector<float> wavetable_;
+    WavetableLoader* wavetableLoader_;
+    size_t wavetableId_ = 0;
 
     Envelope envelope_;
 
+    // float phase_ = 0.0f; inherited from parent class
+    float frequency_ = 0.0f;
+    float phaseIncrement = 0.0f;
+
+    static constexpr float kPi_ = 3.14159265358979323846;
+
 };

src/synth/Synth.cpp

@@ -2,7 +2,7 @@
 #include "Synth.hpp"
 
 Synth::Synth(ConfigService* config, LoggerService* logger, ScopeBuffer* scope, NoteQueue* queue) :
-    config_(config), logger_(logger), scope_(scope), noteQueue_(queue) {
+    config_(config), logger_(logger), scope_(scope), noteQueue_(queue), instrumentFactory_(config_, logger_) {
 
     // load audio settings from config service
     if(!(config->getConfig<AudioParams, AudioConfig>("AudioEngine", "Main", &engineConfiguration_))) {
@@ -12,7 +12,14 @@ Synth::Synth(ConfigService* config, LoggerService* logger, ScopeBuffer* scope, N
     // note: this is the audio engine's configuration so we can grab sample rate
     // it includes some synth params as well, so when synth gets its own config node they all need to be moved
     
-    voices_.assign(engineConfiguration_.maxVoices, Voice(config_, logger_, static_cast<float>(engineConfiguration_.sampleRate), &engineConfiguration_));
+    int32_t instrumentsCreated = instrumentFactory_.createInstruments(&instruments_, engineConfiguration_.maxVoices, static_cast<float>(engineConfiguration_.sampleRate), &engineConfiguration_);
+    if(instrumentsCreated == 0) {
+        logger_->log("Audio", LogFlag::Error, "Failed to create any voices from factory.");
+    } else if(instrumentsCreated > engineConfiguration_.maxVoices) {
+        logger_->log("Audio", LogFlag::Warning, "Created too many voices, possible truncation or overflow.");
+    } else {
+        logger_->log("Audio", LogFlag::Info, "Created voices from factory.");
+    }
 
     filter_.setSampleRate(engineConfiguration_.sampleRate);
     filter_.setParams(Filter::Type::BiquadLowpass, 4000.0f, 0.707f);
@@ -22,16 +29,16 @@ Synth::Synth(ConfigService* config, LoggerService* logger, ScopeBuffer* scope, N
 void Synth::handleNoteEvent(const NoteEvent& event) {
 
     // stop all voices that are currently playing this note
-    for(Voice& v : voices_) {
-        if(v.isActive() && v.note() == event.note) {
-            v.noteOff();
+    for(Instrument* i : instruments_) {
+        if(i->isActive() && i->note() == event.note) {
+            i->noteOff();
         }
     }
 
     // call note-on for an idle voice for the note-event
     if(event.type == NoteEventType::NoteOn) {
-        Voice* v = findFreeVoice();
-        if(v != nullptr) v->noteOn(event.note, event.velocity);
+        Instrument* i = findFreeVoice();
+        if(i != nullptr) i->startNote(event.note, event.velocity);
     }
     
 }
@@ -46,9 +53,9 @@ void Synth::process(float* out, size_t nFrames) {
     // find lowest frequency voice for scope triggering
     size_t lowestVoice = 0;
     float lowestFreq = FLT_MAX;
-    for(size_t i = 0; i < voices_.size(); i++) {
-        if(!voices_[i].isActive()) continue;
-        float currentFreq = voices_[i].frequency();
+    for(size_t i = 0; i < instruments_.size(); i++) {
+        if(!instruments_[i]->isActive()) continue;
+        float currentFreq = instruments_[i]->frequency();
         if(currentFreq < lowestFreq) {
             lowestVoice = i;
             lowestFreq = currentFreq;
@@ -66,10 +73,10 @@ void Synth::process(float* out, size_t nFrames) {
 
         // process all active voices and mix their produced samples
         float mix = 0.0f;
-        for(size_t j = 0; j < voices_.size(); j++) {
+        for(size_t j = 0; j < instruments_.size(); j++) {
             bool temp = false;
-            if(!voices_[j].isActive()) continue;
-            mix += voices_[j].process(temp);
+            if(!instruments_[j]->isActive()) continue;
+            mix += instruments_[j]->process(temp);
             if(j == lowestVoice) triggered = temp;
         }
         mix = tanh(mix); // prevent clipping
@@ -89,21 +96,21 @@ void Synth::process(float* out, size_t nFrames) {
 
 }
 
-Voice* Synth::findFreeVoice() {
+Instrument* Synth::findFreeVoice() {
 
-    for(Voice& v : voices_) {
-        if(!v.isActive()) {
-            return &v;
+    for(Instrument* i : instruments_) {
+        if(!i->isActive()) {
+            return i;
         }
     }
     return nullptr;
 }
 
-Voice* Synth::findVoiceByNote(uint8_t note) {
+Instrument* Synth::findVoiceByNote(uint8_t note) {
 
-    for(Voice& v : voices_) {
-        if(v.isActive() && v.note() == note) {
-            return &v;
+    for(Instrument* i : instruments_) {
+        if(i->isActive() && i->note() == note) {
+            return i;
         }
     }
     return nullptr;

src/synth/Synth.hpp

@@ -5,9 +5,10 @@
 #include "config/AudioConfig.hpp"
 #include "LoggerService.hpp"
 #include "NoteQueue.hpp"
-#include "Voice.hpp"
 #include "Scope.hpp"
 #include "Filter.hpp"
+#include "Instruments/Instrument.hpp"
+#include "InstrumentFactory.hpp"
 
 #include <vector>
 
@@ -23,20 +24,21 @@ public:
 
 private:
 
-    Voice* findFreeVoice();
-    Voice* findVoiceByNote(uint8_t note);
+    Instrument* findFreeVoice();
+    Instrument* findVoiceByNote(uint8_t note);
 
     std::vector<uint8_t> sustainedNotes_;
     Filter filter_;
 
     // voices
     size_t maxVoices;
-    std::vector<Voice> voices_;
+    std::vector<Instrument*> instruments_;
 
     ConfigService* config_;
     AudioParams engineConfiguration_;
     LoggerService* logger_;
-    ScopeBuffer* scope_;;
+    ScopeBuffer* scope_;
     NoteQueue* noteQueue_;
+    InstrumentFactory instrumentFactory_;
 
 };

src/synth/Voice.cpp

@@ -1,35 +0,0 @@
-
-#include "Voice.hpp"
-
-Voice::Voice(ConfigService* config, LoggerService* logger, float sampleRate, AudioParams* params) :
-    config_(config), logger_(logger), sampleRate_(sampleRate), params_(params) {
-
-    // TODO: instrument factory << WHAT DO YOU MEAN JUST TODO A WHOLE FACTORY
-    instrument_ = PianoString(config_, logger_, sampleRate_);
-
-}
-
-void Voice::noteOn(uint8_t midiNote, float velocity) {
-
-    note_ = midiNote;
-    instrument_.noteOn(noteToFrequency(midiNote), velocity);
-
-}
-
-void Voice::noteOff() {
-
-    instrument_.noteOff();
-
-}
-
-bool Voice::isActive() {
-
-    return instrument_.isActive();
-
-}
-
-float Voice::process(bool& scopeTrigger) {
-
-    return instrument_.process(scopeTrigger);
-
-}

src/synth/Voice.hpp

@@ -1,44 +0,0 @@
-
-#pragma once
-
-#include <stdint.h>
-
-#include "instruments/Instrument.hpp"
-#include "instruments/PianoString.hpp"
-#include "config/AudioConfig.hpp"
-
-// a voice is a tone generator that the synth uses for polyphony
-// the synth mixes multiple voices together into a polyphonic audio. calculations for samples are handled in the instrument
-class Voice {
-
-public:
-
-    Voice() = default;
-    Voice(ConfigService* config, LoggerService* logger, float sampleRate, AudioParams* params);
-    ~Voice() = default;
-
-    void noteOn(uint8_t midiNote, float velocity);
-    void noteOff();
-    bool isActive();
-
-    float process(bool& scopeTrigger);
-    uint8_t note() { return note_; }
-    float frequency() { return noteToFrequency(note_); }
-
-private:
-
-    inline float noteToFrequency(uint8_t note) {
-        return params_->pitchStandard * pow(params_->octaveConstant, static_cast<float>(note - params_->midiHome) / params_->notesPerOctave); 
-    }
-    
-    float sampleRate_ = 1.0f;
-    uint8_t note_ = 0;
-    float velocity_ = 1.0f;
-    bool active_ = false;
-
-    ConfigService* config_;
-    AudioParams* params_;
-    LoggerService* logger_;
-    PianoString instrument_;
-
-};

src/synth/WavetableLoader.hpp

@@ -1,6 +1,8 @@
 
 #pragma once
 
+#pragma once
+
 // placeholder to handle loading wavetables from files
 // so that wavetables can be shared to each voice/instrument
 // only need to need to load once for x number of voices