player.js

"use strict";
var music = Array(),
    track,
    audio,
    pic,
    title,
    shuffle,
    repeat,
    err,
    playlist,
    offset;
function getId(id) {
  return document.getElementById(id);
}

function randInt(min, max) {
  var rand = Math.round(Math.random() * (max - min + 1) + min);
  if (rand == max + 1) {
    return min;
  }
  return rand;
}

function sendEvt(element, event) {
  var evt = document.createEvent("HTMLEvents");
  evt.initEvent(event, true, true);
  return !element.dispatchEvent(evt);
}

function extToMime(ext) {
  switch(ext) {
    case "mp3":
      return "audio/mpeg";
    case "mp2":
      return "audio/mpeg";
    case "ogg":
      return "audio/ogg";
    case "aac":
      return "audio/aac";
    case "wav":
      return "audio/wave";
    case "webm":
      return "audio/webm";
    default:
      "audio/" + ext;
  }
}

function wait4It(fn) {// Dirty trick
  try {
    fn();
  } catch(e) {
    setTimeout(function() {
      wait4It(fn);
    }, 7);
  }
}

function populateList(arr, e, dir) {
  var li,
      i,
      x,
      cover;
  for (i in arr) {
    if (i != "/") {
      li = document.createElement('li');
      li.className = "folder";
      li.textContent = i;
      e.appendChild(li);
      li.addEventListener('click', function(event) {
        event.stopPropagation();
        if (this.className.indexOf("open") == -1) {
          this.className = "open " + this.className;
        } else {
          this.className = this.className.substr(5);
        }
      }, false);
      li.appendChild(document.createElement('ul'))
      populateList(arr[i], li.childNodes[1], dir + i + '/');
    } else {
      cover = false;
      for (x in arr[i]) {
        if (arr[i][x].slice(0, arr[i][x].lastIndexOf('.')).toLowerCase() == "cover") {
          cover = arr[i][x];
          arr[i].splice(x, 1);
          break;
        }
      }
      for (x in arr[i]) {
        li = document.createElement('li');
        li.id = music.length;
        li.className = "song";
        li.textContent = arr[i][x].substr(0, arr[i][x].lastIndexOf('.'));
        li.setAttribute('file', dir + arr[i][x]);
        li.setAttribute('cover', cover ? dir + cover : '/icons/sound2.png');
        li.addEventListener('click', function(event) {
          event.stopPropagation();
          var file = this.getAttribute('file'),
              cover = this.getAttribute('cover'),
              s = document.createElement('source'),
              mime = extToMime(file.substr(-3)),
              last = music[track];
          if (last.className.indexOf('playing') > -1) {
            while (last.id != 'playlist') {
              last.className = last.className.slice(0, -8);
              last = last.parentNode.parentNode;
            }
          }
          pic.src = cover;
          title.textContent = this.textContent;
          if (!audio.canPlayType(mime)) {
            err.textContent = "This browser does not support " + mime.substr(mime.indexOf('/') + 1).toUpperCase() + " audio."
            err.className = 'open';
          } else {
            err.removeAttribute('class');
          }
          s.type = mime;
          s.src = file;
          audio.appendChild(s);
          if (audio.childNodes.length > 1) {
            audio.removeChild(audio.childNodes[0]);
          }
          audio.load();
          audio.play();
          track = parseInt(this.id);
          if (mime == 'audio/mpeg' || mime == 'audio/aac') {
            ID3.loadTags(file, function() {
              var tags = ID3.getAllTags(file);
              document.getElementById("artist").textContent = "Artist : " + tags.artist || "";
              document.getElementById("album").textContent = "Album : " + tags.album || "";
              window.document.title = title.textContent = tags.title || title.textContent;
            });
          } else {
              document.getElementById("artist").textContent = "";
              document.getElementById("album").textContent = "";
              window.document.title = title.textContent;
          }
          last = music[track];
          while (last.id != 'playlist') {
            last.className += ' playing';
            last = last.parentNode.parentNode;
          }
        }, false);
        e.appendChild(li);
        music.push(li);
      }
    }
  }
}

function init() {
  var ul = document.createElement('ul'),
      config = localStorage.getItem("config");
  audio = getId('audio');
  title = getId('title');
  pic = getId('cover');
  shuffle = getId('shuffle');
  repeat = getId('repeat');
  err = getId('error');
  offset = getId('player').offsetHeight + 32;
  playlist = getId('playlist');
  playlist.appendChild(ul);
  sendEvt(window, 'resize');
  populateList(library['music'], ul, library['path']);
  config = config != null ? JSON.parse(config) : {// Default player settings
    "volume" : .25,
    "track" : 0,
    "state" : false,
    "time" : 0,
    "shuffle" : true,
    "repeat" : false
  };
  audio.addEventListener("ended", function() {
    if (repeat.checked) {
      audio.currentTime = 0;
      return audio.play();
    }
    var next = track;
    if (shuffle.checked) {
      next = randInt(0, music.length - 1);
    } else if (track + 1 < music.length) {
      next++;
    } else {
      next = 0;
    }
    sendEvt(music[next], 'click');
  }, false);
  getId('next').addEventListener("click", function() {
    if (track == music.length - 1) {
      track = -1;
    }
    sendEvt(music[track + 1], 'click');
  }, false);
  getId('back').addEventListener("click", function() {
    if (track == 0) {
      track = music.length;
    }
    sendEvt(music[track - 1], 'click');
  }, false);
  shuffle.checked = config["shuffle"];
  repeat.checked = config["repeat"];
  track = config["track"];
  if (config['time'] == 0 && track == 0) {
    sendEvt(audio, 'ended');
  } else {
    sendEvt(music[track], 'click');
    audio.pause();
    wait4It(function() {
      audio.currentTime = config["time"];
      if (config["state"] === false) {
        audio.play();
      }
    });
  }
  audio.volume = config["volume"];
  window.onunload = function() {
    if (isNaN(track) || isNaN(audio.currentTime) || isNaN(audio.volume)) {
      return;
    }
    localStorage.setItem("config", JSON.stringify({
      "volume" : audio.volume,
      "track" : track,
      "state" : audio.paused === true,
      "time" : audio.currentTime,
      "shuffle" : shuffle.checked === true,
      "repeat" : repeat.checked === true
    }));
  }
  document.addEventListener('keyup', function(event) {// keyboard shortcuts
    switch(event.which) {
      case 32:
        audio[audio.paused?'play':'pause']();
        return;
      // spacebar
      case 107:
        audio.volume = audio.volume + .1 > 1 ? 1 : audio.volume + .1;
        return;
      // + (num pad)
      case 109:
        audio.volume = audio.volume - .1 < 0 ? 0 : audio.volume - .1;
        return;
      // - (num pad)
      case 37:
        getId('back').click();
        return;
      // left arrow
      case 39:
        getId('next').click();
        return;
      // right arrow
      case 38:
        audio.currentTime += 5;
        return;
      // up arrow
      case 40:
        audio.currentTime -= 5;
        return;
      // down arrow
      case 83:
        shuffle.checked = !shuffle.checked;
        return;
      // s
      case 82:
        repeat.checked = !repeat.checked;
        return;
      // r
    }
  }, false);
}

window.onresize = function() {
  playlist.style.maxHeight = window.innerHeight - offset + 'px';
}