git.r.bdr.sh - rbdr/r.bdr.sh/blob - jekyll/js/vendor/recorderjs/recorder.js

   1 (function(window){
   2
   3   var WORKER_PATH = 'recorderWorker.js';
   4
   5   var Recorder = function(source, cfg){
   6     var config = cfg || {};
   7     var bufferLen = config.bufferLen || 4096;
   8     this.context = source.context;
   9     this.node = (this.context.createScriptProcessor ||
  10                  this.context.createJavaScriptNode).call(this.context,
  11                                                          bufferLen, 2, 2);
  12     var worker = new Worker(config.workerPath || WORKER_PATH);
  13     worker.postMessage({
  14       command: 'init',
  15       config: {
  16         sampleRate: this.context.sampleRate
  17       }
  18     });
  19     var recording = false,
  20       currCallback;
  21
  22     var self = this;
  23     this.node.onaudioprocess = function(e){
  24       if (!recording) return;
  25       self.ondata && self.ondata(e.inputBuffer.getChannelData(0));
  26       worker.postMessage({
  27         command: 'record',
  28         buffer: [
  29           e.inputBuffer.getChannelData(0),
  30           e.inputBuffer.getChannelData(1)
  31         ]
  32       });
  33     }
  34
  35     this.configure = function(cfg){
  36       for (var prop in cfg){
  37         if (cfg.hasOwnProperty(prop)){
  38           config[prop] = cfg[prop];
  39         }
  40       }
  41     }
  42
  43     this.record = function(){
  44       recording = true;
  45     }
  46
  47     this.stop = function(){
  48       recording = false;
  49     }
  50
  51     this.clear = function(){
  52       worker.postMessage({ command: 'clear' });
  53     }
  54
  55     this.getBuffer = function(cb) {
  56       currCallback = cb || config.callback;
  57       worker.postMessage({ command: 'getBuffer' })
  58     }
  59
  60     this.exportWAV = function(cb, type){
  61       currCallback = cb || config.callback;
  62       type = type || config.type || 'audio/wav';
  63       if (!currCallback) throw new Error('Callback not set');
  64       worker.postMessage({
  65         command: 'exportWAV',
  66         type: type
  67       });
  68     }
  69
  70     this.shutdown = function(){
  71       worker.terminate();
  72       source.disconnect();
  73       this.node.disconnect();
  74     };
  75
  76     worker.onmessage = function(e){
  77       var blob = e.data;
  78       currCallback(blob);
  79     }
  80
  81     source.connect(this.node);
  82     this.node.connect(this.context.destination);    //this should not be necessary
  83   };
  84
  85   Recorder.forceDownload = function(blob, filename){
  86     var url = (window.URL || window.webkitURL).createObjectURL(blob);
  87     var link = window.document.createElement('a');
  88     link.href = url;
  89     link.download = filename || 'output.wav';
  90     var click = document.createEvent("Event");
  91     click.initEvent("click", true, true);
  92     link.dispatchEvent(click);
  93   }
  94
  95   window.Recorder = Recorder;
  96
  97 })(window);