Code

//MAIN CODE

import processing.serial.*;
import processing.sound.*;
import ddf.minim.*;
import controlP5.*;

ControlP5 gui;
Serial port;
Minim minim;
Button BPnext;               //Button for Next File
Button BPstop;               //           Stop Playing          DONE
Button BPcont;               //           Continue Playing      DONE
Button BMexit;               //           Exit                  DONE
Button BAactive;             //           Is Serial port?       WIP
Button BFgetFolder;          //           Getting Dir to play   WIP
Button BVisu;                //Toggle For Visualization         DOING
Slider Sleng;                //                                 WIP
AudioPlayer player;          //                                 DONE
File[] files;                //                                 WIP(Counting WIP, other DONE)
File filetoplay;             //                                 DONE

int i = 100, overButton, directory, x, y, activeTab = 1;
int[] keysPressed;
String dir;
//String line = "C:\\Users\\Maccraft\\Desktop\\MUZYKABEZID3";
String line = ""; //Insert here path to directory with music
String nowPlay;
PFont font;
boolean isPi = false;
boolean isSerial = false;
boolean isPhone = false;
PrintWriter output;
BufferedReader reader;

void setup()
{
  background(0);
  size(500,200);

  font = createFont("arial", 10);
  files = listFiles(line);

  minim = new Minim(this);
  try
  {
   port = new Serial(this, Serial.list()[1], 9600);
   isSerial = true;
  }
  catch(Exception e)
  {
    isSerial = false;
  }
  gui = new ControlP5(this);
  reDraw();
  filetoplay = files[int(random(0, 51))]; //Replase 51 with .mp3 count
  println("PLAYING: ", filetoplay.getName());
  player = minim.loadFile(filetoplay.getAbsolutePath());
  player.play();
  textFont(font);
}

void draw()
{
  background(0);
  stroke(255);
  if (activeTab == 1)
  {
  for(int i = 0; i < player.bufferSize() - 1; i++)
    {
      float x1 = map( i, 0, player.bufferSize(), 0, 500);
      float x2 = map( i+1, 0, player.bufferSize(), 0, 500);
      line( x1, 100 + player.left.get(i)*50, x2, 100 + player.left.get(i+1)*50 );
    }
  }
  if (player.position()+10 == player.length())
   Next();

  Sleng.setValue(map(player.position(), 0, player.length(), 1, 100));
}

//FUNCTIONS CODE:

void Next()
{
  filetoplay = files[int(random(0, 51))];
  if (isSerial) println("Now Playing: "+filetoplay.getName());
  println("Now Playing: ", filetoplay.getName());
  player.mute();
  player = minim.loadFile(filetoplay.getAbsolutePath());
  player.play();
}

void Play()
{
  player.play();
}

void Stop()
{
  player.pause();
}

void EXIT()
{
  exit();
}

//GUI CODE:



void reDraw()
{
  background(0);

  gui.getTab("default")
   .activateEvent(true)
    .setLabel("Player")
     .setId(1);

   gui.getTab("Arduino")
   .activateEvent(true)
    .setId(2);

   gui.getTab("Files")
   .activateEvent(true)
    .setId(3);

  BPnext = new Button(gui, "Next")
   .setPosition(0, 16)
    .setHeight(24)
     .setWidth(50)
      .setFont(font);

  BPcont = new Button(gui, "Play")
   .setPosition (50,16)
    .setHeight(24)
     .setWidth(50)
      .setFont(font);

  BPstop = new Button(gui, "Stop")
   .setPosition(100, 16)
    .setHeight(24)
     .setWidth(47)
      .setFont(font);

  BMexit = new Button(gui, "EXIT")
   .setPosition(450, 0)
    .setHeight(24)
     .setWidth(50)
      .setFont(font);

  BAactive = new Button(gui, "IsSerial")
   .setPosition(150, 50)
    .setLabel("Serial Port Enabled?")
     .moveTo("Arduino")
      .setFont(font);

  BFgetFolder = new Button(gui, "Directory")
   .setPosition(150, 50)
     .moveTo("Files")
      .setFont(font);

  BVisu = new Button(gui, "GameMode")
   .setPosition(147, 16)
    .setHeight(24)
     .setWidth(100)
      .moveTo("default")
       .setLabelVisible(true)
        .setFont(font);

  Sleng = new Slider(gui, "Rewind")
   .setPosition(0, height-20)
    .setSize(width, 20)
     .setRange(1, 100);

}

//TABS CODE:

void controlEvent(ControlEvent theControlEvent)
{
 if (theControlEvent.isTab())
  activeTab = theControlEvent.getTab().getId();
}