qmk_firmware/keyboards/minimacro5/keymaps/media/keymap.c

#include QMK_KEYBOARD_H

#define _MAIN 0

void encoder_update_user(uint8_t index, bool clockwise) {
  if (index == 0) { /* First encoder*/
    if (clockwise) {
      tap_code(KC_VOLU);
    } else {
      tap_code(KC_VOLD);
    }
  } else if (index == 1) { /* Second encoder*/
    if (clockwise) {
      tap_code(KC_3);
    } else {
      tap_code(KC_4);
    }
  } else if (index == 2) { /* Third encoder*/
    if (clockwise) {
      tap_code(KC_5);
    } else {
      tap_code(KC_6);
    }
  } else if (index == 3) { /* Fourth encoder*/
    if (clockwise) {
      tap_code(KC_7);
    } else {
      tap_code(KC_8);
    }
  } else if (index == 4) { /* Fifth encoder*/
    if (clockwise) {
      tap_code(KC_9);
    } else {
      tap_code(KC_0);
    }
  }
}

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = { //buttion closest to usb is first
  [_MAIN] = LAYOUT_ortho_1x5(
     KC_MUTE, KC_MEDIA_PREV_TRACK, KC_MEDIA_NEXT_TRACK, KC_MEDIA_PLAY_PAUSE, KC_MEDIA_STOP
  )
};