MIDI To Note Length, Delay, and Frequency In A Relevantly Applicable Format

Or just MIDI2LengthAndFreqsArrays.

Description

This is simply a quite useful, albeit niche, program written by yours truly that translates MIDI files into usable array data. Designed originally specifically for making arduino buzzer tone tunes much more easily than manual transcription, this simple software outputs three clearly labeled arrays in each text file, for each track, for each present MIDI file.

Usage Instructions

0. Download and extract zip file or publish the release build of source.
1. Run the executable once.
2. Copy and paste your midi files (*.mid, *.midi) into the newly created ./MIDI2LengthAndFreqsArrays_IO/ folder located at the exe.
3. Run the executable again. (Hit any key to close at end)
4. Check the ./MIDI2LengthAndFreqsArrays_IO/ folder and observe your new text files.

Note that the program deletes all (*.txt) files within the IO folder upon execution, then regenerates based on the current MIDI files.

Output Format

Plain text files (.txt) of names formatted to include the track and origin MIDI file name. Example contents of output file:

Note Frequency (Hz): {[doubles]} Note Length (ms): {[more doubles]} Pre-Note Delay (ms): {[doubles again]}

Basic Usage Example

Here is some C++ Arduino code for playing the output on a buzzer:

long TestSeqAlphaFreqs[] PROGMEM = {[insert note frequencies]};
long TestSeqAlphaLengths[] PROGMEM = {[insert note lengths]};
long TestSeqAlphaPreNoteDelay[] PROGMEM = {[insert pre-note delays]};
// No idea why I used longs but usually uint16_t should be fine

void setup()
{
  // BUZZER BOOTUP SONG TEST
  noTone(BZZR_TEST_PIN);
  long prevNoteSustain = 0;
  for (int n = 0; n < TestSeqAlphaTotalLength; n++)
  {
    uint32_t
      frequency = pgm_read_word_near(&(TestSeqAlphaFreqs[n])),
      sustainLength = pgm_read_word_near(&(TestSeqAlphaLengths[n])),
      preDelay = pgm_read_word_near(&(TestSeqAlphaPreNoteDelay[n]));
  
    delay(preDelay + prevNoteSustain);
    tone(BZZR_TEST_PIN, frequency, max(sustainLength, 8));
    prevNoteSustain = sustainLength;
  }
}

Multiple tracks would require multiple buzzers, thus the loop code would have to be modified a bit for that.