Bluecat's Plug'N'Script - Midi Channel 1 Exclusive only, when playing

midi_ch1_exckl.cxx

/** \file
*   MIDI channel filter.
*   Filter MIDI events (keeps only MIDI events for the selected channel).
*/

#include "lib/Midi.hxx"

// metadata
string name="MIDI Channel Special Filter";
string description="Filters events of other channels (when channel 1 is used)";


array<string> inputParametersNames={"Mode"};
array<string> inputParametersEnums={"Ch1 Exkl;Ch1 Only;Ch1++;Off"};
array<double> inputParameters(inputParametersNames.length,0);

array<double> inputParametersMin={0};
array<double> inputParametersMax={3};
array<double> inputParametersDefault={0};
array<double> inputParametersSteps={1};
array<MidiEvent> lateMidiIn = {};

int channelOneInUse = 0;
int channelOtherInUse = 0;
uint8 notePlus = 255;
uint8 lastNotePlus = 255;
uint64 pblock = 0;
int8 mode = 0;

void reset() {
  channelOneInUse = 0;
  channelOtherInUse = 0;
  notePlus = 255;
  lastNotePlus = 255;
  pblock = 0;
}

void processBlock(BlockData& data) {
  array<MidiEvent> midiIn = {};
  string temp, temp2, temp3, temp4, temp5;
  bool skip = false;
  pblock++;
  //just 1 midi event and 16 samples delay event per one process block, process it on the next process block (delayed for 16 samples)
  if(mode == 2 && data.inputMidiEvents.length > 0 && data.inputMidiEvents.length < 3 && data.samples.length <= 16) {
    //fill buffer
    for(uint i=0;i<data.inputMidiEvents.length;i++) {
      lateMidiIn.insertLast(data.inputMidiEvents[i]);
    }
    return;
  }
  //if late midi data, add this to buffer
  if(lateMidiIn.length>0) {
    midiIn = lateMidiIn;
    lateMidiIn = {};
  }
  //fill buffer with new events
  for(uint i=0;i<data.inputMidiEvents.length;i++) {
    if(MidiEventUtils::getType(data.inputMidiEvents[i]) == kMidiNoteOff || MidiEventUtils::getType(data.inputMidiEvents[i]) == kMidiNoteOn) {
      midiIn.insertLast(data.inputMidiEvents[i]);
    }
  }
  //preprocess for bass Mode
  for(uint i=0;i<midiIn.length;i++) {
    if(MidiEventUtils::getChannel(midiIn[i]) != 1) {
      switch(MidiEventUtils::getType(midiIn[i])) {
      case kMidiNoteOn:
        notePlus = MidiEventUtils::getNote(midiIn[i]);
        break;
      case kMidiNoteOff:
        notePlus = 255;
        break;
      }
    }
  }
  //debugdata
  intToString(mode, temp2);
  intToString(pblock, temp3);
  intToString(data.samples.length, temp4);
  intToString(midiIn.length, temp5);
  //process midi events
  for(uint i=0;i<midiIn.length;i++) {
    skip = false;
    intToString(MidiEventUtils::getNote(midiIn[i]), temp);
    switch (MidiEventUtils::getChannel(midiIn[i])) {
        case 1:
          switch(MidiEventUtils::getType(midiIn[i])) {
            case kMidiNoteOn:
              channelOneInUse ++;
              break;
            case kMidiNoteOff:
              channelOneInUse --;
              break;
          }
          data.outputMidiEvents.push(midiIn[i]);
          if(mode == 2 && notePlus != 255) {
            MidiEvent tempEv = midiIn[i];
            if(MidiEventUtils::getType(midiIn[i]) == kMidiNoteOn) {
              //normal out
              MidiEventUtils::setNote(tempEv, notePlus);
              lastNotePlus = notePlus;
            } else {
              MidiEventUtils::setNote(tempEv, lastNotePlus);
            }
            data.outputMidiEvents.push(tempEv);
          }
          break;
        default:
          switch(MidiEventUtils::getType(midiIn[i])) {
          case kMidiNoteOn:
            channelOtherInUse ++;
            break;
          case kMidiNoteOff:
            channelOtherInUse --;
            break;
          }
          if(
              (channelOneInUse==0 || mode == 3) && (mode != 1 && mode != 2)
              ) {
            data.outputMidiEvents.push(midiIn[i]);
          } else {
            skip = true;
          }
          break;
    }
    /*
    print(
        (MidiEventUtils::getChannel(midiIn[i]) != 1 ? "            ;" : "" ) +
        (MidiEventUtils::getType(midiIn[i]) == kMidiNoteOn ? "Note On" : "Note Off") +
        " " + temp +  ";" +
        (skip ? "- Skipped -":"") +
        "Mode: " + temp2 + "  --- #" + temp3 + " (" + temp4 + " samples, " + temp5 + " midi data)"
        );
    */
  }
  //switch mode only, hwn nothing is in process
  if(channelOneInUse == 0 && channelOtherInUse == 0 && lateMidiIn.length == 0) {
    mode = int8(inputParameters[0]+0.5);
  }
}

int getLatency() {
  return 0;
}