web worker support

kripken · Jan 13, 2012 · 4ea90aa · 4ea90aa
1 parent 904faf2
commit 4ea90aa
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Showing 3 changed files with 23 additions and 9 deletions.
diff --git a/demo.html b/demo.html
@@ -10,7 +10,7 @@
 <body>
   <h1>speak.js</h1>
   <h2>Text-To-Speech on the Web</h2>
-  <form onsubmit="speak(text.value, { amplitude: amplitude.value, wordgap: workdgap.value, pitch: pitch.value, speed: speed.value, debug: true }); return false">
+  <form onsubmit="speak(text.value, { amplitude: amplitude.value, wordgap: workdgap.value, pitch: pitch.value, speed: speed.value, worker: true }); return false">
     Text: <input type="text" name="text" size=50 value="Never gonna give, you, up.">
     Amplitude: <input type="text" name="amplitude" size=5 value="100">
     Pitch: <input type="text" name="pitch" size=5 value="50">

diff --git a/speakClient.js b/speakClient.js
@@ -69,15 +69,23 @@ function speak(text, args) {
     }
   }
 
-  var startTime = Date.now();
+  function handleWav(wav) {
+    var data = parseWav(wav); // validate the data and parse it
 
-  var wav = generateSpeech(text, args);
-  var data = parseWav(wav); // validate the data and parse it
-
-  // TODO: try playAudioDataAPI(data), and fallback if failed
-  playHTMLAudioElement(wav);
+    // TODO: try playAudioDataAPI(data), and fallback if failed
+    playHTMLAudioElement(wav);
+  }
 
-  var endTime = Date.now();
-  if (args && args.debug) console.log('speak.js: took ' + (endTime - startTime) + ' ms.');
+  if (!(args && args.worker)) {
+    // Do everything right now. speakGenerator.js must have been loaded.
+    handleWav(generateSpeech(text, args));
+  } else {
+    // Call a worker, which will return a wav that we then play
+    var worker = new Worker('speakWorker.js');
+    worker.onmessage = function(event) {
+      handleWav(event.data);
+    };
+    worker.postMessage({ text: text, args: args });
+  }
 }
 
diff --git a/speakWorker.js b/speakWorker.js
@@ -0,0 +1,6 @@
+importScripts('speakGenerator.js');
+
+onmessage = function(event) {
+  postMessage(generateSpeech(event.data.text, event.data.args));
+};
+