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better MIDI

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This commit is contained in:
Gordon JC Pearce 2025-01-07 17:50:23 +00:00
parent b32579e6e1
commit a884d11f61
2 changed files with 48 additions and 10 deletions
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50
plugin/alphaosc.cpp
View File

@ -32,6 +32,11 @@ void AlphaOsc::initAudioPort(bool input, uint32_t index, AudioPort &port) {
if (!input && index == 0) port.name = "Osc Out";
}
void AlphaOsc::activate() {
uint8_t i;
for (i = 0; i < 7; i++) notequeue[i] = 0x00; // mark note as unused
}
// Processing function
void AlphaOsc::run(const float **, float **outputs, uint32_t frames, const MidiEvent *midiEvents, uint32_t midiEventCount) {
bzero(outputs[0], sizeof(float) * frames);
@ -40,7 +45,7 @@ void AlphaOsc::run(const float **, float **outputs, uint32_t frames, const MidiE
//(void)midiEventCount;
//(void)midiEvents;
uint32_t i;
uint32_t i, j;
uint32_t osc;
uint8_t lfo, pw;
@ -53,19 +58,48 @@ void AlphaOsc::run(const float **, float **outputs, uint32_t frames, const MidiE
float out, in;
// handle any MIDI events
for(i=0; i<midiEventCount; i++) {
if (midiEvents[i].data[0] == 0x90) {
for (i = 0; i < midiEventCount; i++) {
uint8_t val = 0;
uint8_t status = midiEvents[i].data[0];
if (midiEvents[i].size > 1) {
val = midiEvents[i].data[1];
}
if (status == 0x90) {
// note on
note = midiEvents[i].data[1];
freq = 130.81*powf(2, (note-48)/12.0f);
// if (notequeue[0] != val) {
// we're not just re-enabling the first note in the queue
for (j = 0; j < 7; j++) {
// insert note into queue, highest first
if (notequeue[j] < val) { // note is lower
// make space, dropping lowest note out
memmove(notequeue + j + 1, notequeue + j, 7 - j);
notequeue[j] = val;
break;
}
}
//}
// first note in queue is going to play
note = notequeue[0];
freq = 130.81 * powf(2, (note - 48) / 12.0f);
gate = 1;
}
if (midiEvents[i].data[0] == 0x80 && midiEvents[1].data[1] == note) {
// note off for same note
gate = 0;
if (status == 0x80) {
// note off
// find the note in the queue
for (j = 0; j < 7; j++) {
if (notequeue[j] == val) {
// found it, move notes down
memmove(notequeue + j, notequeue + j + 1, 7 - j);
}
}
note = notequeue[0];
freq = 130.81 * powf(2, (note - 48) / 12.0f);
if (notequeue[0] == 0) gate = 0;
}
}
// steeply "logarithmic" curve similar to the Juno 106 LFO rate curve

6
plugin/alphaosc.hpp
View File

@ -50,8 +50,10 @@ class AlphaOsc : public Plugin {
// Initialisation
void initAudioPort(bool input, uint32_t index, AudioPort &port) override;
void initParameter(uint32_t index, Parameter &parameter) override;
void activate() override;
void setParameterValue(uint32_t index, float value) override;
float getParameterValue(uint32_t index) const override;
@ -63,6 +65,8 @@ class AlphaOsc : public Plugin {
uint32_t omega, lfoOmega;
uint32_t phase, lfoPhase;
uint8_t notequeue[8];
uint8_t note = 48; // last heard MIDI note
float freq = 130.8; // C3, an octave below Middle C
float gate = 0; // output attenuation