FileStream DShow

vvvv.nodes.dshow9.js

// VVVV.js -- Visual Web Client Programming
// (c) 2011 Matthias Zauner
// VVVV.js is freely distributable under the MIT license.
// Additional authors of sub components are mentioned at the specific code locations.


/*
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 NODE: FileStream (DShow9)
 Author(s): Vadim Smakhtin
 Original Node Author(s): VVVV Group
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/

VVVV.Nodes.FileStream = function(id, graph) {
  this.constructor(id, "FileStream (DShow9)", graph);
  
  this.meta = {
    authors: ['Vadim Smakhtin'],
    original_authors: ['VVVV Group'],
    credits: [],
    compatibility_issues: []
  };

  this.auto_evaluate = false;

  var playIn = this.addInputPin("Play", [0], this);
  var loopIn = this.addInputPin("Loop", [0], this);
  var startTimeIn = this.addInputPin("Start Time", [0.0], this);
  var endTimeIn = this.addInputPin("End Time", [0.0], this);
  var doSeekIn = this.addInputPin("Do Seek", [0], this);
  var seekPositionIn = this.addInputPin("Seek Position", [0.0], this);
  var speedIn = this.addInputPin("Speed", [1.0], this);
  var filenameIn = this.addInputPin("Filename", ["file.avi"], this);

  var audioOut = this.addOutputPin("Audio", [], this);
  var midiOut = this.addOutputPin("Midi", [], this);
  var videoOut = this.addOutputPin("Video", [], this);
  var durationOut = this.addOutputPin("Duration", [0.0], this);
  var positionOut = this.addOutputPin("Position", [0.0], this);
  var seekingCapabilitiesOut = this.addOutputPin("Seeking Capabilities", [], this);
  var bytesToReadOut = this.addOutputPin("Bytes to Read", [0], this);


  var audioStreams = [];

  this.evaluate = function() {
   

    var maxSize = this.getMaxInputSliceCount();
    var fileName;
    var extension;

    audioOut.setSliceCount(audioStreams.length);

    for (var i=0; i<maxSize; i++) {
      audioOut.setValue(i, audioStreams[i]);

      if (!filenameIn.pinIsChanged() || !this.contexChanged)
      {
        fileName = filenameIn.getValue(i);
        extension = fileName.split('.')[0];

        switch(extension)
        {
          case: "mp3":
            audioStreams[i] = new Audio(fileName);
            break;
        }
      }
    }
  }
}
VVVV.Nodes.String2Enum.prototype = new VVVV.Core.Node();

Audio = function(fileName) {
  this.context = new webkitAudioContext();
  this.source = context.createBufferSource();
  
  this.analyser = context.createAnalyser();
  analyser.fftSize = 2048;

  this.audioBuffer = null;

  source.connect(analyser);
  analyser.connect(context.destination);

  loadAudio(fileName);

  function loadAudio (url) {
    var request = new XMLHttpRequest();
    request.open("GET", url, true);
    request.responseType = "arraybuffer";

    request.onLoad = function () {
      this.audioBuffer = context.createBuffer(request.response, false /*true*/);
      finishLoad();  // add in the slider, etc. now that we've loaded the audio
    }
  }

  function finishLoad() {
    source.buffer = audioBuffer;
    source.looping = true;

    source.noteOn(0.0);
  }
}