MicroDexed/drums.cpp

/*
   MicroDexed

   MicroDexed is a port of the Dexed sound engine
   Dexed ist heavily based on https://github.com/google/music-synthesizer-for-android

   (c)2018-2021 H. Wirtz <wirtz@parasitstudio.de>

   Permission is hereby granted, free of charge, to any person obtaining a copy
   of this software and associated documentation files (the "Software"), to deal
   in the Software without restriction, including without limitation the rights
   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   copies of the Software, and to permit persons to whom the Software is
   furnished to do so, subject to the following conditions:

   The above copyright notice and this permission notice shall be included in
   all copies or substantial portions of the Software.

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   THE SOFTWARE.
*/

#include <Arduino.h>
#include <ArduinoJson.h>
#include <Audio.h>
#include "config.h"
#include "drums.h"

extern drum_config_t drum_config[DRUM_MAX_INSTRUMENTS];

uint8_t read_drum_config(void)
{
  uint8_t config_drums = 0;
  File json;
  DynamicJsonDocument drums_json(4096);

  AudioNoInterrupts();
  if (SD.exists("/DRM/CFGDrums.json"))
  {
#ifdef DEBUG
    Serial.println(F("Found drum configuration file."));
#endif
    json = SD.open("/DRM/CFGDrums.json");
    if (json)
    {
      deserializeJson(drums_json, json);
      json.close();

      config_drums = drums_json["drums"].size();
#ifdef DEBUG
      Serial.print(F("Drum Objects: "));
      Serial.println(config_drums);
      if (config_drums > DRUM_MAX_INSTRUMENTS)
        Serial.println(F("*** Maximum number of drum samples exceeded! ***"));
      //Serial.println(F("Drum Configuration:"));
      //serializeJsonPretty(drums_json, Serial);
      //Serial.println();
#endif
      config_drums = constrain(config_drums, 0, DRUM_MAX_INSTRUMENTS);
    }
  }
  AudioInterrupts();

  uint8_t drum = 0;
  JsonObject root = drums_json["drums"].as<JsonObject>();
  for (JsonPair kv : root)
  {
    sprintf(drum_config[drum].filename, "/drm/%s.wav", kv.key().c_str());
    if (!SD.exists(drum_config[drum].filename))
    {
#ifdef DEBUG
      Serial.print(F("Cannot find WAV file ["));
      Serial.print(drum_config[drum].filename);
      Serial.println(F("]"));
#endif
      continue;
    }
    JsonObject drum_root = drums_json["drums"][kv.key().c_str()].as<JsonObject>();
    for (JsonPair drum_kv : drum_root)
    {
      if (strcmp(drum_kv.key().c_str(), "drum_class") == 0)
      {
        if (drum_kv.value().is<const char*>())
        {
          if (strcmp(drum_kv.value().as<const char*>(), "DRUM_NONE") == 0)
            drum_config[drum].drum_class = DRUM_NONE;
          else if (strcmp(drum_kv.value().as<const char*>(), "DRUM_BASS") == 0)
            drum_config[drum].drum_class = DRUM_BASS;
          else if (strcmp(drum_kv.value().as<const char*>(), "DRUM_SNARE") == 0)
            drum_config[drum].drum_class = DRUM_SNARE;
          else if (strcmp(drum_kv.value().as<const char*>(), "DRUM_HIHAT") == 0)
            drum_config[drum].drum_class = DRUM_HIHAT;
          else if (strcmp(drum_kv.value().as<const char*>(), "DRUM_HANDCLAP") == 0)
            drum_config[drum].drum_class = DRUM_HANDCLAP;
          else if (strcmp(drum_kv.value().as<const char*>(), "DRUM_RIDE") == 0)
            drum_config[drum].drum_class = DRUM_RIDE;
          else if (strcmp(drum_kv.value().as<const char*>(), "DRUM_CHRASH") == 0)
            drum_config[drum].drum_class = DRUM_CHRASH;
          else if (strcmp(drum_kv.value().as<const char*>(), "DRUM_LOWTOM") == 0)
            drum_config[drum].drum_class = DRUM_LOWTOM;
          else if (strcmp(drum_kv.value().as<const char*>(), "DRUM_MIDTOM") == 0)
            drum_config[drum].drum_class = DRUM_MIDTOM;
          else if (strcmp(drum_kv.value().as<const char*>(), "DRUM_HIGHTOM") == 0)
            drum_config[drum].drum_class = DRUM_HIGHTOM;
          else if (strcmp(drum_kv.value().as<const char*>(), "DRUM_PERCUSSION") == 0)
            drum_config[drum].drum_class = DRUM_PERCUSSION;
        }
      }
      else if (strcmp(drum_kv.key().c_str(), "midinote") == 0)
      {
        if (drum_kv.value().is<const char*>())
        {
          uint8_t note_number = 0;
          uint8_t oct = 0;
          char midi_note[4];

          strcpy(midi_note, drum_kv.value().as<const char*>());

          switch (midi_note[0])
          {
            case 'C':
              if (midi_note[1] == '#')
              {
                note_number = 1;
                oct = midi_note[2] - 48;
              }
              else
              {
                note_number = 0;
                oct = midi_note[1] - 48;
              }
              break;
            case 'D':
              if (midi_note[1] == '#')
              {
                note_number = 3;
                oct = midi_note[2] - 48;
              }
              else
              {
                note_number = 2;
                oct = midi_note[1] - 48;
              }
              break;
            case 'E':
              note_number = 4;
              oct = midi_note[1] - 48;
              break;
            case 'F':
              if (midi_note[1] == '#')
              {
                note_number = 6;
                oct = midi_note[2] - 48;
              }
              else
              {
                note_number = 5;
                oct = midi_note[1] - 48;
              }
              break;
            case 'G':
              if (midi_note[1] == '#')
              {
                note_number = 8;
                oct = midi_note[2] - 48;
              }
              else
              {
                note_number = 7;
                oct = midi_note[1] - 48;
              }
              break;
            case 'A':
              if (midi_note[1] == '#')
              {
                note_number = 10;
                oct = midi_note[2] - 48;
              }
              else
              {
                note_number = 9;
                oct = midi_note[1] - 48;
              }
              break;
            case 'B':
              note_number = 11;
              oct = midi_note[1] - 48;
              break;
          }
          drum_config[drum].midinote = constrain(note_number + 12 + (oct  * 12), 21, 127);
        }
      }
      else if (strcmp(drum_kv.key().c_str(), "shortname") == 0)
      {
        memset(drum_config[drum].shortname, 0, 2);
        if (drum_kv.value().is<const char*>())
          drum_config[drum].shortname[0] = drum_kv.value().as<const char*>()[0];
      }
      else if (strcmp(drum_kv.key().c_str(), "pan") == 0)
      {
        if (drum_kv.value().is<float>())
          drum_config[drum].pan = constrain(drum_kv.value().as<float>(), 0.0, 1.0);
        if (drum_kv.value().is<int>())
          drum_config[drum].pan = constrain(float(drum_kv.value().as<int>()), 0.0, 1.0);
      }
      else if (strcmp(drum_kv.key().c_str(), "vol_max") == 0)
      {
        if (drum_kv.value().is<float>())
          drum_config[drum].vol_max = constrain(drum_kv.value().as<float>(), 0.0, 1.0);
        if (drum_kv.value().is<int>())
          drum_config[drum].vol_max = constrain(float(drum_kv.value().as<int>()), 0.0, 1.0);
      }
      else if (strcmp(drum_kv.key().c_str(), "vol_min") == 0)
      {
        if (drum_kv.value().is<float>())
          drum_config[drum].vol_min = constrain(drum_kv.value().as<float>(), 0.0, 1.0);
        if (drum_kv.value().is<int>())
          drum_config[drum].vol_min = constrain(float(drum_kv.value().as<int>()), 0.0, 1.0);
      }
      else if (strcmp(drum_kv.key().c_str(), "reverb_send") == 0)
      {
        if (drum_kv.value().is<float>())
          drum_config[drum].reverb_send = constrain(drum_kv.value().as<float>(), 0.0, 1.0);
        if (drum_kv.value().is<int>())
          drum_config[drum].reverb_send = constrain(float(drum_kv.value().as<int>()), 0.0, 1.0);
      }
    }

#ifdef DEBUG
    Serial.print(F("[Drum "));
    Serial.print(drum, DEC);
    Serial.println(F("]"));
    Serial.print(F("drum_class="));
    Serial.println(drum_config[drum].drum_class, DEC);
    Serial.print(F("midinote="));
    Serial.println(drum_config[drum].midinote, DEC);
    Serial.print(F("filename="));
    Serial.println(drum_config[drum].filename);
    Serial.print(F("shortname="));
    Serial.println(drum_config[drum].shortname);
    Serial.print(F("pan="));
    Serial.println(drum_config[drum].pan);
    Serial.print(F("vol_max="));
    Serial.println(drum_config[drum].vol_max);
    Serial.print(F("vol_min="));
    Serial.println(drum_config[drum].vol_min);
    Serial.print(F("reverb_send="));
    Serial.println(drum_config[drum].reverb_send);
#endif
    drum++;
  }
  
  drum++;
  drum_config[drum].drum_class = DRUM_NONE;
  drum_config[drum].midinote = 0;
  strcpy(drum_config[drum].filename, "EMPTY");
  strcpy(drum_config[drum].shortname, "-");
  drum_config[drum].pan = 0.0;
  drum_config[drum].vol_max = 0.0;
  drum_config[drum].vol_min = 0.0;
  drum_config[drum].reverb_send = 0.0;

  return (drum);
}