giuliomoro@181: /*
giuliomoro@181: * render.cpp
giuliomoro@181: *
giuliomoro@181: * Created on: Oct 24, 2014
giuliomoro@181: * Author: parallels
giuliomoro@181: */
giuliomoro@181:
giuliomoro@301: #include <Bela.h>
giuliomoro@181: #include <Midi.h>
giuliomoro@187: #include <Utilities.h>
giuliomoro@181: #include <stdlib.h>
giuliomoro@181: #include <rtdk.h>
giuliomoro@181: #include <cmath>
giuliomoro@181:
giuliomoro@224: float gFreq;
giuliomoro@224: float gPhaseIncrement = 0;
giuliomoro@224: bool gIsNoteOn = 0;
giuliomoro@224: int gVelocity = 0;
giuliomoro@224: float gSamplingPeriod = 0;
giuliomoro@224:
giuliomoro@226: void midiMessageCallback(MidiChannelMessage message, void* arg){
giuliomoro@226: if(arg != NULL){
giuliomoro@226: rt_printf("Message from midi port %d: ", *(int*)arg);
giuliomoro@226: }
giuliomoro@224: message.prettyPrint();
giuliomoro@224: if(message.getType() == kmmNoteOn){
giuliomoro@224: gFreq = powf(2, (message.getDataByte(0)-69)/12.0f) * 440;
giuliomoro@224: gVelocity = message.getDataByte(1);
giuliomoro@224: gPhaseIncrement = 2 * M_PI * gFreq * gSamplingPeriod;
giuliomoro@224: gIsNoteOn = gVelocity > 0;
giuliomoro@224: rt_printf("v0:%f, ph: %6.5f, gVelocity: %d\n", gFreq, gPhaseIncrement, gVelocity);
giuliomoro@224: }
giuliomoro@224: }
giuliomoro@181: // setup() is called once before the audio rendering starts.
giuliomoro@181: // Use it to perform any initialisation and allocation which is dependent
giuliomoro@181: // on the period size or sample rate.
giuliomoro@181: //
giuliomoro@181: // userData holds an opaque pointer to a data structure that was passed
giuliomoro@181: // in from the call to initAudio().
giuliomoro@181: //
giuliomoro@181: // Return true on success; returning false halts the program.
giuliomoro@181: Midi midi;
giuliomoro@226: int gMidiPort0 = 0;
giuliomoro@301: bool setup(BelaContext *context, void *userData)
giuliomoro@181: {
giuliomoro@226: midi.readFrom(gMidiPort0);
giuliomoro@226: midi.writeTo(gMidiPort0);
giuliomoro@224: midi.enableParser(true);
giuliomoro@226: midi.setParserCallback(midiMessageCallback, &gMidiPort0);
giuliomoro@181: if(context->analogFrames == 0) {
giuliomoro@226: rt_printf("Error: this example needs the analog I/O to be enabled\n");
giuliomoro@181: return false;
giuliomoro@181: }
giuliomoro@224: gSamplingPeriod = 1/context->audioSampleRate;
giuliomoro@181: return true;
giuliomoro@181: }
giuliomoro@181:
giuliomoro@181: // render() is called regularly at the highest priority by the audio engine.
giuliomoro@181: // Input and output are given from the audio hardware and the other
giuliomoro@181: // ADCs and DACs (if available). If only audio is available, numMatrixFrames
giuliomoro@181: // will be 0.
giuliomoro@181:
giuliomoro@181:
giuliomoro@181: enum {kVelocity, kNoteOn, kNoteNumber};
giuliomoro@301: void render(BelaContext *context, void *userData)
giuliomoro@181: {
giuliomoro@224: // one way of getting the midi data is to parse them yourself
giuliomoro@224: // (you should set midi.enableParser(false) above):
giuliomoro@224: /*
giuliomoro@224: static midi_byte_t noteOnStatus = 0x90; //on channel 1
giuliomoro@181: static int noteNumber = 0;
giuliomoro@181: static int waitingFor = kNoteOn;
giuliomoro@184: static int playingNote = -1;
giuliomoro@197: int message;
giuliomoro@181: while ((message = midi.getInput()) >= 0){
giuliomoro@191: rt_printf("%d\n", message);
giuliomoro@181: switch(waitingFor){
giuliomoro@181: case kNoteOn:
giuliomoro@181: if(message == noteOnStatus){
giuliomoro@181: waitingFor = kNoteNumber;
giuliomoro@181: }
giuliomoro@181: break;
giuliomoro@181: case kNoteNumber:
giuliomoro@181: if((message & (1<<8)) == 0){
giuliomoro@181: noteNumber = message;
giuliomoro@181: waitingFor = kVelocity;
giuliomoro@181: }
giuliomoro@181: break;
giuliomoro@181: case kVelocity:
giuliomoro@181: if((message & (1<<8)) == 0){
giuliomoro@184: int _velocity = message;
giuliomoro@181: waitingFor = kNoteOn;
giuliomoro@184: // "monophonic" behaviour, with priority to the latest note on
giuliomoro@184: // i.e.: a note off from a previous note does not stop the current note
giuliomoro@184: // still you might end up having a key down and no note being played if you pressed and released another
giuliomoro@184: // key in the meantime
giuliomoro@184: if(_velocity == 0 && noteNumber == playingNote){
giuliomoro@181: noteOn = false;
giuliomoro@184: playingNote = -1;
giuliomoro@184: velocity = _velocity;
giuliomoro@184: } else if (_velocity > 0) {
giuliomoro@184: noteOn = true;
giuliomoro@184: velocity = _velocity;
giuliomoro@184: playingNote = noteNumber;
giuliomoro@184: f0 = powf(2, (playingNote-69)/12.0f) * 440;
giuliomoro@184: phaseIncrement = 2 * M_PI * f0 / context->audioSampleRate;
giuliomoro@184: }
giuliomoro@181: rt_printf("NoteOn: %d, NoteNumber: %d, velocity: %d\n", noteOn, noteNumber, velocity);
giuliomoro@181: }
giuliomoro@181: break;
giuliomoro@181: }
giuliomoro@181: }
giuliomoro@199: */
giuliomoro@224: /*
giuliomoro@197: int num;
giuliomoro@197: //alternatively, you can use the built-in parser (only processes channel messages at the moment).
giuliomoro@197: while((num = midi.getParser()->numAvailableMessages()) > 0){
giuliomoro@197: static MidiChannelMessage message;
giuliomoro@197: message = midi.getParser()->getNextChannelMessage();
giuliomoro@197: message.prettyPrint();
giuliomoro@199: if(message.getType() == kmmNoteOn){
giuliomoro@199: f0 = powf(2, (message.getDataByte(0)-69)/12.0f) * 440;
giuliomoro@199: velocity = message.getDataByte(1);
giuliomoro@199: phaseIncrement = 2 * M_PI * f0 / context->audioSampleRate;
giuliomoro@199: noteOn = velocity > 0;
giuliomoro@224: rt_printf("v0:%f, ph: %6.5f, velocity: %d\n", f0, phaseIncrement, gVelocity);
giuliomoro@199: }
giuliomoro@197: }
giuliomoro@224: */
giuliomoro@224: // the following block toggles the LED on an Owl pedal
giuliomoro@224: // and asks the pedal to return the status of the LED
giuliomoro@224: // using MIDI control changes
giuliomoro@191: for(unsigned int n = 0; n < context->analogFrames; n++){
giuliomoro@191: static int count = 0;
giuliomoro@191: static bool state = 0;
andrewm@308: analogWriteOnce(context, n, 1, state);
giuliomoro@191: if(count % 40000 == 0){
giuliomoro@191: state = !state;
giuliomoro@224: midi_byte_t bytes[6] = {176, 30, (char)(state*127), 176, 67, 30}; // toggle the OWL led and ask for the led status
giuliomoro@191: midi.writeOutput(bytes, 6);
giuliomoro@191: }
giuliomoro@199: count++;
giuliomoro@199: }
giuliomoro@199: for(unsigned int n = 0; n < context->audioFrames; n++){
giuliomoro@224: if(gIsNoteOn == 1){
giuliomoro@181: static float phase = 0;
giuliomoro@224: phase += gPhaseIncrement;
giuliomoro@181: if(phase > 2 * M_PI)
giuliomoro@181: phase -= 2 * M_PI;
giuliomoro@224: float value = sinf(phase) * gVelocity/128.0f;
andrewm@308: audioWrite(context, n, 0, value);
andrewm@308: audioWrite(context, n, 1, value);
giuliomoro@181: } else {
andrewm@308: audioWrite(context, n, 0, 0);
andrewm@308: audioWrite(context, n, 1, 0);
giuliomoro@181: }
giuliomoro@181: }
giuliomoro@181: }
giuliomoro@181:
giuliomoro@181: // cleanup() is called once at the end, after the audio has stopped.
giuliomoro@181: // Release any resources that were allocated in setup().
giuliomoro@181:
giuliomoro@301: void cleanup(BelaContext *context, void *userData)
giuliomoro@181: {
giuliomoro@181:
giuliomoro@181: }