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PluginSimpleSynth.cpp
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PluginSimpleSynth.cpp
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/*
* Simple Synth audio efffect based on DISTRHO Plugin Framework (DPF)
* Copyright (C) 2018 Christopher Arndt <info@chrisarndt.de>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <math.h>
#include "PluginSimpleSynth.hpp"
START_NAMESPACE_DISTRHO
// -----------------------------------------------------------------------
PluginSimpleSynth::PluginSimpleSynth()
: Plugin(paramCount, 1, 0) // paramCount params, 1 program(s), 0 states
{
sampleRateChanged(getSampleRate());
osc = sawOsc();
env = new ADSR();
loadProgram(0);
}
PluginSimpleSynth::~PluginSimpleSynth() {
delete env;
delete osc;
}
// -----------------------------------------------------------------------
// Init
void PluginSimpleSynth::initParameter(uint32_t index, Parameter& parameter) {
if (index >= paramCount)
return;
parameter.ranges.min = 0.0f;
parameter.ranges.max = 1.0f;
parameter.ranges.def = 0.1f;
parameter.hints = kParameterIsAutomable | kParameterIsLogarithmic;
switch (index) {
case paramVolume:
parameter.name = "Volume";
parameter.symbol = "volume";
break;
}
}
/**
Set the name of the program @a index.
This function will be called once, shortly after the plugin is created.
*/
void PluginSimpleSynth::initProgramName(uint32_t index, String& programName) {
switch (index) {
case 0:
programName = "Default";
break;
}
}
// -----------------------------------------------------------------------
// Internal data
/**
Optional callback to inform the plugin about a sample rate change.
*/
void PluginSimpleSynth::sampleRateChanged(double newSampleRate) {
fSampleRate = newSampleRate;
}
/**
Get the current value of a parameter.
*/
float PluginSimpleSynth::getParameterValue(uint32_t index) const {
return fParams[index];
}
/**
Change a parameter value.
*/
void PluginSimpleSynth::setParameterValue(uint32_t index, float value) {
fParams[index] = value;
switch (index) {
case paramVolume:
// nothing to do here...
break;
}
}
/**
Load a program.
The host may call this function from any context,
including realtime processing.
*/
void PluginSimpleSynth::loadProgram(uint32_t index) {
switch (index) {
case 0:
setParameterValue(paramVolume, 0.6f);
break;
}
}
// -----------------------------------------------------------------------
// Process
void PluginSimpleSynth::activate() {
double fSampleRate = getSampleRate();
osc->setFrequency(440.0f / fSampleRate);
env->setAttackRate(0.1f * fSampleRate);
env->setDecayRate(0.3f * fSampleRate);
env->setReleaseRate(2.0f * fSampleRate);
env->setSustainLevel(0.8f);
for (int i=0; i < 128; i++) {
noteState[i] = false;
}
}
void PluginSimpleSynth::run(const float**, float** outputs, uint32_t frames,
const MidiEvent *midiEvents, uint32_t midiEventCount) {
// get the left and right audio outputs
float* const outL = outputs[0];
float* const outR = outputs[1];
uint8_t note, velo;
float freq, vol = fParams[paramVolume];
for (uint32_t count, pos=0, curEventIndex=0; pos<frames;) {
for (;curEventIndex < midiEventCount && pos >= midiEvents[curEventIndex].frame; ++curEventIndex) {
if (midiEvents[curEventIndex].size > MidiEvent::kDataSize)
continue;
const uint8_t* data = midiEvents[curEventIndex].data;
const uint8_t status = data[0] & 0xF0;
switch (status) {
case 0x90:
note = data[1];
velo = data[2];
DISTRHO_SAFE_ASSERT_BREAK(note < 128);
if (noteState[note]) {
if (velo == 0) {
noteState[note] = false;
env->gate(false);
}
}
else if (velo > 0) {
freq = 440.0f * powf(2.0f, (note - 69.0f) / 12.0f);
osc->setFrequency(freq / fSampleRate);
noteState[note] = true;
env->gate(true);
break;
}
break;
case 0x80:
note = data[1];
DISTRHO_SAFE_ASSERT_BREAK(note < 128);
if (noteState[note]) {
noteState[note] = false;
env->gate(false);
}
break;
}
}
if (curEventIndex < midiEventCount && midiEvents[curEventIndex].frame < frames)
count = midiEvents[curEventIndex].frame - pos;
else
count = frames - pos;
for (uint32_t i=0; i<count; ++i) {
float sample = osc->getOutput() * env->process() * vol;
outL[pos + i] = sample;
outR[pos + i] = sample;
osc->updatePhase();
}
pos += count;
}
}
// -----------------------------------------------------------------------
Plugin* createPlugin() {
return new PluginSimpleSynth();
}
// -----------------------------------------------------------------------
END_NAMESPACE_DISTRHO