Add voice notes

// FREEBIE

js/components.js

@@ -38595,4 +38595,203 @@ if (typeof exports === 'object') {
 	}
 
 	module.exports = autosize;
-});
+});
+(function(window) {
+  // internal: same as jQuery.extend(true, args...)
+  var extend = function() {
+    var target = arguments[0],
+        sources = [].slice.call(arguments, 1);
+    for (var i = 0; i < sources.length; ++i) {
+      var src = sources[i];
+      for (key in src) {
+        var val = src[key];
+        target[key] = typeof val === "object"
+          ? extend(typeof target[key] === "object" ? target[key] : {}, val)
+          : val;
+      }
+    }
+    return target;
+  };
+
+  var WORKER_FILE = {
+    wav: "WebAudioRecorderWav.js",
+    ogg: "WebAudioRecorderOgg.js",
+    mp3: "WebAudioRecorderMp3.js"
+  };
+
+  // default configs
+  var CONFIGS = {
+    workerDir: "/",     // worker scripts dir (end with /)
+    numChannels: 2,     // number of channels
+    encoding: "wav",    // encoding (can be changed at runtime)
+
+    // runtime options
+    options: {
+      timeLimit: 300,           // recording time limit (sec)
+      encodeAfterRecord: false, // process encoding after recording
+      progressInterval: 1000,   // encoding progress report interval (millisec)
+      bufferSize: undefined,    // buffer size (use browser default)
+
+      // encoding-specific options
+      wav: {
+        mimeType: "audio/wav"
+      },
+      ogg: {
+        mimeType: "audio/ogg",
+        quality: 0.5            // (VBR only): quality = [-0.1 .. 1]
+      },
+      mp3: {
+        mimeType: "audio/mpeg",
+        bitRate: 160            // (CBR only): bit rate = [64 .. 320]
+      }
+    }
+  };
+
+  // constructor
+  var WebAudioRecorder = function(sourceNode, configs) {
+    extend(this, CONFIGS, configs || {});
+    this.context = sourceNode.context;
+    if (this.context.createScriptProcessor == null)
+      this.context.createScriptProcessor = this.context.createJavaScriptNode;
+    this.input = this.context.createGain();
+    sourceNode.connect(this.input);
+    this.buffer = [];
+    this.initWorker();
+  };
+
+  // instance methods
+  extend(WebAudioRecorder.prototype, {
+    isRecording: function() { return this.processor != null; },
+
+    setEncoding: function(encoding) {
+      if (this.isRecording())
+        this.error("setEncoding: cannot set encoding during recording");
+      else if (this.encoding !== encoding) {
+        this.encoding = encoding;
+        this.initWorker();
+      }
+    },
+
+    setOptions: function(options) {
+      if (this.isRecording())
+        this.error("setOptions: cannot set options during recording");
+      else {
+        extend(this.options, options);
+        this.worker.postMessage({ command: "options", options: this.options });
+      }
+    },
+
+    startRecording: function() {
+      if (this.isRecording())
+        this.error("startRecording: previous recording is running");
+      else {
+        var numChannels = this.numChannels,
+            buffer = this.buffer,
+            worker = this.worker;
+        this.processor = this.context.createScriptProcessor(
+                                this.options.bufferSize,
+                                this.numChannels, this.numChannels);
+        this.input.connect(this.processor);
+        this.processor.connect(this.context.destination);
+        this.processor.onaudioprocess = function(event) {
+          for (var ch = 0; ch < numChannels; ++ch)
+            buffer[ch] = event.inputBuffer.getChannelData(ch);
+          worker.postMessage({ command: "record", buffer: buffer });
+        };
+        this.worker.postMessage({
+          command: "start",
+          bufferSize: this.processor.bufferSize
+        });
+        this.startTime = Date.now();
+      }
+    },
+
+    recordingTime: function() {
+      return this.isRecording() ? (Date.now() - this.startTime) * 0.001 : null;
+    },
+
+    cancelRecording: function() {
+      if (this.isRecording()) {
+        this.input.disconnect();
+        this.processor.disconnect();
+        delete this.processor;
+        this.worker.postMessage({ command: "cancel" });
+      } else
+        this.error("cancelRecording: no recording is running");
+    },
+
+    finishRecording: function() {
+      if (this.isRecording()) {
+        this.input.disconnect();
+        this.processor.disconnect();
+        delete this.processor;
+        this.worker.postMessage({ command: "finish" });
+      } else
+        this.error("finishRecording: no recording is running");
+    },
+
+    cancelEncoding: function() {
+      if (this.options.encodeAfterRecord)
+        if (this.isRecording())
+          this.error("cancelEncoding: recording is not finished");
+        else {
+          this.onEncodingCanceled(this);
+          this.initWorker();
+        }
+      else
+        this.error("cancelEncoding: invalid method call");
+    },
+
+    initWorker: function() {
+      if (this.worker != null)
+        this.worker.terminate();
+      this.onEncoderLoading(this, this.encoding);
+      this.worker = new Worker(this.workerDir + WORKER_FILE[this.encoding]);
+      var _this = this;
+      this.worker.onmessage = function(event) {
+        var data = event.data;
+        switch (data.command) {
+          case "loaded":
+            _this.onEncoderLoaded(_this, _this.encoding);
+            break;
+          case "timeout":
+            _this.onTimeout(_this);
+            break;
+          case "progress":
+            _this.onEncodingProgress(_this, data.progress);
+            break;
+          case "complete":
+            _this.onComplete(_this, data.blob);
+            break;
+          case "error":
+            _this.error(data.message);
+        }
+      };
+      this.worker.postMessage({
+        command: "init",
+        config: {
+          sampleRate: this.context.sampleRate,
+          numChannels: this.numChannels
+        },
+        options: this.options
+      });
+    },
+
+    error: function(message) {
+      this.onError(this, "WebAudioRecorder.js:" + message);
+    },
+
+    // event handlers
+    onEncoderLoading: function(recorder, encoding) {},
+    onEncoderLoaded: function(recorder, encoding) {},
+    onTimeout: function(recorder) { recorder.finishRecording(); },
+    onEncodingProgress: function (recorder, progress) {},
+    onEncodingCanceled: function(recorder) {},
+    onComplete: function(recorder, blob) {
+      recorder.onError(recorder, "WebAudioRecorder.js: You must override .onComplete event");
+    },
+    onError: function(recorder, message) { console.log(message); }
+  });
+
+  window.WebAudioRecorder = WebAudioRecorder;
+})(window);