YTDJ/js/main.js

// Loads the IFrame Player API code asynchronously.
let tag = document.createElement('script');
tag.src = 'https://www.youtube.com/iframe_api';
let firstScriptTag = document.getElementsByTagName('script')[0];
firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);

//THE DJ CROSSFADER!!!
let crossfader = document.querySelector('#crossfader');

class player {
  trackID;
  player;
  crossfaderCoef;

  constructor(id) {
    this.id = id;
    this.iframe = document.querySelector('#'+this.id);

    this.node = this.iframe.parentNode;
    this.volume = this.node.querySelector('.volume-slider').value;
    this.volSliderVal = this.node.querySelector('.volume-slider-value');
    this.volVal = this.node.querySelector('.volume-value')
    this.volSliderVal.innerHTML = this.volume + '%';
    this.loadButton = this.node.querySelector('.load-button');
    this.speedSlider = this.node.querySelector('.speed-slider');
    this.speedSlider.nextElementSibling.querySelector('.speed-value').innerHTML = this.speedSlider.value;
  }

  init(trackID) {
    this.trackID = trackID;
    let src = `https://www.youtube-nocookie.com/embed/${trackID}?disablekb=1&enablejsapi=1&playsinline=1&autoplay=0&rel=0&modestbranding=1&iv_load_policy=3&version=3`;
    this.iframe.setAttribute('src', src);
    this.player = new YT.Player(this.id, {
      events: {
        'onReady': this.onPlayerReady.bind(this),
        'onStateChange': this.onPlayerStateChange.bind(this),
        'onError': this.onPlayerError.bind(this)
      }
    });
  }
  onPlayerReady(e) {
    this.player.setVolume(this.volume);

    this.node.querySelector('.volume-slider').addEventListener('input', (e) => {
      this.volume = e.target.value;
      this.volSliderVal.innerHTML = this.volume + '%';
      this.volumeUpdate();
    });

    this.loadButton.addEventListener('click', () => {
      let url = prompt('Enter a YouTube URL (track or playlist):', 'https://www.youtube.com/watch?v=' + this.trackID);

      if (url) {
        let resp = check_url(url);

        if (resp < 0) {
          console.log('Nothing to load!');
        } else if (resp == 0) {
          let newTrackID = get_video_id(url);
          let newPlaylistID = get_playlist_id(url);

          if (newPlaylistID[0] != 0) {
            console.log('playlistid to load: ' + newPlaylistID);
            this.loadPlaylist(newPlaylistID);
          } else if (newTrackID != 0) {
            console.log('track to load: ' + newTrackID);
            this.load(newTrackID);
          } else {
            console.log('Nothing to load!');
          }
        } else if (resp == 1) {
          fetch_bandcamp_url(url);
        }


      }
    });

    this.speedSlider.addEventListener('input', (e) => {
      this.speedSlider.nextElementSibling.querySelector('.speed-value').innerHTML = e.target.value;
      this.player.setPlaybackRate(Number(e.target.value));
    });

    this.volumeUpdate();
  }

  onPlayerStateChange(e) {
    console.log(this.id + ' state change: ' + e.data);
  }

  onPlayerError(e) {
    console.log(this.id + ' - Error: ' + e.data);
  }

  load(trackID) {
    this.player.loadVideoById(trackID);
  }

  loadPlaylist(playlistID) {
    //First element should be the playlist ID, second element the index of the video to play
    let list = playlistID[0];
    let index = playlistID[1];

    this.player.loadPlaylist({
      list: list,
      listType: 'playlist',
      index: index
    });
  }

  volumeUpdate() {
    let outputVolume = Math.round(this.volume * this.crossfaderCoef);
    this.player.setVolume(outputVolume);

    this.volVal.innerHTML = outputVolume + '%';

    let boxShadowStyle = '0 0 3em #ddbddd'
    this.iframe.style.boxShadow = boxShadowStyle + componentToHex(Math.round(this.crossfaderCoef*255));
  }
}


let playerA = new player('playerA');
let playerB = new player('playerB');


function onYouTubeIframeAPIReady() {
  playerA.init('anWaxGNDRJ4')
  playerB.init('PhEuAuhH418');
}

calcCrossfaderCoefs(crossfader.value);

crossfader.addEventListener('input', (e) => {
  //Makes the slider stick on the middle
  if (Math.abs(crossfader.value - 500) < 20) {
    crossfader.value = 500;
  }

  calcCrossfaderCoefs(crossfader.value);

  playerA.volumeUpdate();
  playerB.volumeUpdate();

  // updateCrossfader(crossfader.value);
});

function calcCrossfaderCoefs(input) {
  let normVal = input / 1000;

  //Classic 'transition' curve
  let coefB = Math.min(normVal*2, 1);
  let coefA = Math.min((1-normVal)*2, 1);

  //Cheap smooth curve
  // let coefB = normVal ** 2;
  // let coefA = (1 - normVal) ** 2;

  //Amplitude-preserving curve (but not power)
  // let coefB = (normVal ** 2) * (3 - 2 * normVal);
  // let coefA = 1 - coefB;

  playerA.crossfaderCoef = coefA;
  playerB.crossfaderCoef = coefB;
}

function check_url(url) {
  let test = url.indexOf('youtu');
  if (test > -1 && test < 13) {
    return 0; //It's most likely a youtube link
  } else if (url.indexOf('.bandcamp') > -1 || url.indexOf('/album/') > -1 || url.indexOf('/track/') > -1) {
    return 1; //It's most likely a bandcamp link
  } else {
    return -1; //Wrong link
  }
}

// From https://stackoverflow.com/a/55616161/14182148
function get_playlist_id(url) {
    let VID_REGEX = /^.*(youtu.be\/|v\/|u\/\w\/|embed\/|watch\?v=|\&v=)([^#\&\?]*).*/
    let regPlaylist = /[?&]list=([^#\&\?]+)/;
    let regIndex = /[?&]index=([^#]+)/;
    let match = url.match(regPlaylist);
    let matchIndex = url.match(regIndex);
    let index = 0;
    if (matchIndex != null) {
      index = matchIndex[1] - 1;
    }
    if (match != null) {
      return [match[1], index];
    } else {
      return [0,0];
    }
}

function get_video_id(url) { //originally 'video_id_from_playlist'
    let VID_REGEX = /^.*(youtu.be\/|v\/|u\/\w\/|embed\/|watch\?v=|\&v=)([^#\&\?]*).*/
    let video_id = url.match(VID_REGEX);
    if (video_id != null) {
      return video_id[2];
    } else {
      return 0;
    }
}

function fetch_bandcamp_url(url) {
  let iframe = document.createElement('iframe');
  iframe.setAttribute('class','hidden');
  iframe.setAttribute('src',url);
  playerB.node.parentNode.appendChild(iframe);
  console.log(iframe);
  let scrap = iframe.contentWindow.document.querySelector('script[data-tralbum]');
  console.log('scrap: ' + scrap);
}

function componentToHex(c) {
  var hex = c.toString(16);
  return hex.length == 1 ? "0" + hex : hex;
}

// Thumbnails: https://i1.ytimg.com/vi/{trackID}/mqdefault.jpg

let bcURL = 'https://clett.bandcamp.com/track/placenta';
// let html = async await fetch(bcURL).text(); // html as text
// let doc = new DOMParser().parseFromString(html, 'text/html');
// doc.title; doc.body;

// let Http = new XMLHttpRequest();
// Http.open("GET", bcURL);
// Http.send();
//
// Http.onreadystatechange = (e) => {
//   console.log(Http.responseText)
// }

let areStarsShooting = true;
let shootingStarWrapper = document.getElementsByClassName('shooting-stars-wrapper')[0];
let shootingStar;

function newShootingStar() {
  shootingStar = document.createElement('div');

  let topStart = Math.floor(0.6 * window.innerHeight * Math.random());
  let leftStart = Math.floor(window.innerWidth * (0.1 + 0.8 * Math.random()));
  let duration = 1000 + Math.floor(Math.random() * 5000);
  let distance = 200 + Math.floor(Math.random() * 500);
  let angle = Math.floor(Math.random() * 30) - 15;
  let direction = Math.random() < 0.5 ? -1 : 1;

  shootingStar.style.top = topStart + 'px';
  shootingStar.style.left = leftStart + 'px';
  // root.style.setProperty('--shooting-star-duration', duration + "px");
  // shootingStarCSS.insertRule(':root{--shooting-star-duration: '+ duration + 'ms}');

  document.documentElement.style.setProperty('--shooting-star-duration', duration + "ms");
  document.documentElement.style.setProperty('--shooting-star-translate', distance + "px");
  document.documentElement.style.setProperty('--shooting-star-angle', angle + "deg");
  document.documentElement.style.setProperty('--shooting-star-direction', direction);



  shootingStarWrapper.appendChild(shootingStar);
  shootingStar.classList.add('shooting-star');

  setTimeout(() => {
    shootingStar.remove();
    // let nextIn = 10;
    let nextIn =  7000 + Math.floor(Math.random() * 5000);
    if (areStarsShooting) {
      setTimeout('newShootingStar()', nextIn);
    }
  }, duration);
  // setTimeout('newShootingStar()', duration + nextIn);
}
// function endShootingStar(el) {
//   el.remove();
//   console.log('removed!');
//   let nextIn = 4000;
//   setTimeout('newShootingStar()', nextIn);
// }

newShootingStar();

// Enable/disable shooting stars
let separatorSpan = document.createElement('span');
separatorSpan.innerHTML = ' - ';
document.getElementById('shooting-stars-enable').after(separatorSpan);
document.getElementById('shooting-stars-enable').innerHTML = '⭐️Disable shooting stars⭐️';

document.getElementById('shooting-stars-enable').addEventListener('click', () => {
  if (areStarsShooting) {
    document.getElementById('shooting-stars-enable').innerHTML = '⭐️Enable shooting stars⭐️';
    areStarsShooting = false;
  } else {
    document.getElementById('shooting-stars-enable').innerHTML = '⭐️Disable shooting stars⭐️';
    areStarsShooting = true;
    newShootingStar();
  }
});


// Enable/disable shooting stars (with P5JS background)
// if (typeof processingSketch !== 'undefined') {
//   let separatorSpan = document.createElement('span');
//   separatorSpan.innerHTML = ' - ';
//   document.getElementById('shooting-stars-enable').after(separatorSpan);
//   document.getElementById('shooting-stars-enable').innerHTML = 'Disable shooting stars⭐️';
// }
// document.getElementById('shooting-stars-enable').addEventListener('click', () => {
//   if (processingIsOn) {
//     processingSketch.frameRate(0);
//     document.getElementById('shooting-stars-enable').innerHTML = 'Enable shooting stars⭐️';
//     processingIsOn = false;
//   } else {
//     processingSketch.frameRate(24);
//     document.getElementById('shooting-stars-enable').innerHTML = 'Disable shooting stars⭐️';
//     processingIsOn = true;
//   }
// });