shellscripts/music.html at master · dareni/shellscripts · GitHub

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<html>
  <!--
  Maintained at: git@github.com:dareni/shellscripts.git
  Play random webm audio files from a directory served up by:
    python -m http.server.

  Provide play/pause and skip button.
  If a .txt file exists it is used in a picklist for playlist
  of songs. Each line in the file is the filename of a song.
  -->

  <body>
    <select id="playlistSelector" style="display:none;padding:1%"></select>
    <span id="songName"></span>
    <div>
    <audio id="my-audio" controls width="100%"></audio>
    </div>
    <div>
      <button id="playButton" width="50%" height="20%">play</button>
    </div>
    <div>
      <button id="skipButton" width="50%" height="20%">skip</button>
    </div>

  <style type="text/css">
    #my-audio {width:100%; font-size: 200%; }
    #playButton {width:100%; height:20%; font-size: 200%; }
    #skipButton {width:100%; height:20%; font-size: 200%; }
    #playlistSelector {width:100% height:20%; font-size: 100%;
      display: none
      padding: 1% 1% 1% 1%; font-size: 200%}
    #songName {width:100% height:20%; font-size: 100%;
      display: flex; flex-wrap: wrap;
      align-content: center; align:center;
      padding: 1% 1% 1% 1%; font-size: 200%}
  </style>

  <script>
    console.log("v1.0")
    const baseURL = getBaseUrl();
    const myAudio = document.getElementById('my-audio');
    const playButton = document.getElementById('playButton');
    const skipButton = document.getElementById('skipButton');
    const playlistSelector = document.getElementById('playlistSelector');

    songList=[];
    songUnplayedPool=[];

    requestRootXml();

    function getBaseUrl() {
      var fileDir = document.URL;
      var endURL=fileDir.lastIndexOf("/");
      var baseURL=fileDir.substr(0,endURL);
      return baseURL;
    }

    function requestRootXml() {
      var xmlHttp = new XMLHttpRequest();
      xmlHttp.addEventListener("load", processRootXml);
      xmlHttp.open('GET', baseURL, true);
      xmlHttp.setRequestHeader('Content-Type', 'text/xml');
      xmlHttp.overrideMimeType('application/xml');
      xmlHttp.send();
    }

    function processRootXml(event) {
      var songStartMarker='<li><a href=\"';
      var markerLength=songStartMarker.length;

      if (event.target.status == 200) {
        var songXML = event.target.responseText;
        var files = getFileList(songXML)
        // console.log("filelist no:"+files.length)
            // for (i=0; i< files.length; i++) {
              // console.log(i + ": " + files[i])
            // }
        var playLists = findPlayList(files)
        if (playLists.length > 0) {
          for(i=0; i < playLists.length; i++) {
            const playOption = document.createElement('option')
            playOption.value = playLists[i];
            playOption.text= playLists[i];
            playlistSelector.appendChild(playOption)
          }
          playlistSelector.style.display='block'
          playlistSelector.addEventListener('change', doPlaylistChange)
          requestPlayListFile(playLists[0])
        } else  {
          songList = extractSongListFromFileList(files)
          if (songList.length>0) {
            populateUnplayedPool()
            setSong()
          }
        }
      }
    }

    function getFileList(pageXml) {
      var fileEnd = 0;
      var fileNo=0;
      var fileList=[];
      var fileStartMarker='<li><a href=\"';
      var fileMarkerLength=fileStartMarker.length;

      do {
        var fileStart = pageXml.indexOf(fileStartMarker, fileEnd);
        if (fileStart > 0) {
          fileStart = fileStart + fileMarkerLength;
          fileEnd = pageXml.indexOf('">', fileStart);
          var lineEnd = pageXml.indexOf('\n', fileStart);

          if (fileEnd > 0 && fileEnd < lineEnd) {
            filename=pageXml.substr(fileStart, fileEnd-fileStart);
            fileList[fileNo]=filename;
            fileNo=fileNo+1;
          } else {
            fileStart = -1;
          }
        }
      } while (fileStart != -1)
      return fileList;
    }

    function findPlayList(fileList) {
      var playLists = []
      // console.log("file count:"+fileList.length)
      for (i=0; i< fileList.length; i++) {
        var filename = fileList[i];
        if (filename.length > 4) {
          var suffix = filename.substr(filename.length-3, 3)
          if (suffix === "txt") {
            playLists.push(filename)
          }
        }
      }[]
      return playLists
    }

    function extractSongListFromFileList(fileList) {
      var songList = []
      var songNo = 0;
      for (i=0; i< fileList.length; i++) {
        var filename = fileList[i];
        if (filename.length > 4) {
          var suffix = filename.substr(filename.length-3, 3)
          if (suffix==="mp3" || suffix === "mp4") {
            songList[songNo]=filename;
            songNo+=1;
          }
        }
      }
      return songList
    }

    function doPlaylistChange(event) {
      requestPlayListFile(event.target.value)
    }

    // function processPlayLists(file) {
    //   var playList = file[0];
    //   requestPlayListFile(playList)
    // }

    function requestPlayListFile(filename) {
      var xmlHttp = new XMLHttpRequest();
      xmlHttp.addEventListener("load", processPlayListFile);
      // xmlHttp.open('GET', baseURL+"/"+filename, true);
      var url = baseURL+"/"+filename
      console.log("pl url:"+url)
      xmlHttp.open('GET', url, true);
      xmlHttp.setRequestHeader('Content-Type', 'text/plain');
      // xmlHttp.overrideMimeType('application/xml');
      xmlHttp.send();

    }

    function processPlayListFile(event) {
      if (event.target.status == 200) {
        var playlistText = event.target.responseText;
        console.log(playlistText)
        var endOfLine = 0;
        var songNameStart=0;
        var endOfLineMarker="\n";
        var songNo=0
        songList=[]
        songUnplayedPool=[]
        do {
          var endOfLine = playlistText.indexOf(endOfLineMarker, endOfLine+1);
          if (endOfLine> 0) {
              var songName=playlistText.substr(songNameStart, endOfLine-songNameStart);
              songList[songNo]=songName;
              songNo=songNo+1;
          }
          songNameStart = endOfLine + endOfLineMarker;

        } while (endOfLine != -1)
          if (songList.length>0) {
            populateUnplayedPool()
            setSong()
            myAudio.play()
          }
      } else {
        console.log("Error obtainn playlistfile: "+ event.target.status)
      }
    }

    function switchState() {
      if (myAudio.paused) {
        myAudio.play();
        playButton.textContent = "pause";
      } else {
        myAudio.pause();
        playButton.textContent = "play";
      }
    }

    playButton.addEventListener('click', () => {
      switchState();
    }, false);

    skipButton.addEventListener('click', () => {
      setSong();
      myAudio.play();
    }, false);


    myAudio.addEventListener("ended", () => {
      setSong();
      myAudio.play();
    });

    function populateUnplayedPool() {
      for (i=0; i< songList.length; i++) {
        songUnplayedPool[i]=i
      }
    }

    function getRandomUnplayedSong() {
      if (songUnplayedPool.length < 1) {
        populateUnplayedPool()
      }
      songPrint=""
      for (i=0; i< songUnplayedPool.length; i++) {
        songPrint+=i+", "
      }
      var newSong = Math.floor(Math.random() * songUnplayedPool.length);
      songPrint+=" - song:"+songUnplayedPool[newSong] + " index:"+newSong
      // get the index to the song list before we remove it from unplayed.
      var songListIndex =songUnplayedPool[newSong];
      songUnplayedPool.splice(newSong, 1)
      return songListIndex
    }

    function getRandomSong() {
      var newSong = Math.floor(Math.random() * songList.length);
      return newSong;
    }

    function setSong() {
      var newSong = getRandomUnplayedSong()
      var songName = songList[newSong];
      myAudio.setAttribute('src', songName);
      var songNameDiv = document.getElementById('songName');
      songName = songName.substring(0,songName.length-4);
      songNameDiv.innerHTML=decodeURI(songName);
    }


  </script>
  </body>
</html>