Adding IPA output to emscripten js library and demo

emscripten/demo.html

         display: block;
         margin-bottom: 1rem;
       }
+      #ipaarea {
+        width: 100%;
+        height: 8rem;
+        display: block;
+        margin-bottom: 1rem;         
+      }
       p.gh {
         color: #333;
         text-align: right;
     <h1>espeakng.js 1.49.1 Demo</h1>
     <form>
       <textarea id="texttospeak">Call me Ishmael. Some years ago --- never mind how long precisely --- having little or no money in my purse, and nothing particular to interest me on shore, I thought I would sail about a little and see the watery part of the world. It is a way I have of driving off the spleen and regulating the circulation.</textarea>
+      <textarea readonly="true" placeholder="IPA" id="ipaarea"></textarea>
       <div class="speecharg">
         <label for="pitch">Pitch</label><input id="pitch" type="range" value="50" min="0" max="100" /><button type="button" aria-label="Reset pitch" title="Reset pitch" onclick="resetPitch();">&#x21b6;</button>
       </div>
         <label for="voice">Voice</label><select id="voice"></select><button type="button" aria-label="Reset voice" title="Reset voice" onclick="resetVoice();">&#x21b6;</button>
       </div>
       <div class="bottom">
-        <button type="button" onmousedown="speak();">Speak</button>
+        <button type="button" onmousedown="speakAndIpa();">Speak</button>
         <button type="button" onmousedown="stop();">Stop</button>
       </div>
       <p class="gh"><a href="https://github.com/eeejay/espeak/tree/emscripten">Original Code for eSpeak: Eitan Isaacson</a></p>

emscripten/espeakng_glue.cpp

     espeak_SetSynthCallback(NULL);
   }
 
+  int synth_ipa_(const char* aText, const char* virtualFileName) {
+
+  /* phoneme_mode
+    bit 1:   0=eSpeak's ascii phoneme names, 1= International Phonetic Alphabet (as UTF-8 characters).
+    bit 7:   use (bits 8-23) as a tie within multi-letter phonemes names
+    bits 8-23:  separator character, between phoneme names
+  */
+    
+    espeak_SetSynthCallback(NULL);
+        
+    int phoneme_options               = (1 << 1); // Use IPA
+    int use_custom_phoneme_separator  = (0 << 7);
+    int phonemes_separator            = ' '; // Use a default value
+
+    int phoneme_conf                  = phoneme_options | (phonemes_separator << 8);
+    
+    FILE* f_phonemes_out = fopen(virtualFileName,"wb");
+    if(!f_phonemes_out)
+      return -1;
+    
+    //espeak_ng_InitializeOutput(ENOUTPUT_MODE_SYNCHRONOUS, 0, NULL);
+    espeak_SetPhonemeTrace(phoneme_conf, f_phonemes_out);
+    espeak_Synth(aText, 0, 0, POS_CHARACTER, 0, 0, NULL, NULL);
+    espeak_SetPhonemeTrace(0, NULL);
+    fclose(f_phonemes_out);
+    
+    return 0;
+  }
+
   long set_voice(
         const char* aName,
         const char* aLang=NULL,

emscripten/espeakng_glue.idl

 interface eSpeakNGWorker {
   void eSpeakNGWorker();
   void synth_(DOMString aText, VoidPtr aCallback);
+  long synth_ipa_(DOMString aText, DOMString virtualFileName);
   long getSizeOfEventStruct_();
   long set_voice(DOMString aName, DOMString aLang, optional octet gender=0, optional octet age=0, optional octet aVariant=0);
   [Const] attribute espeak_VOICE[] voices;

emscripten/js/demo.js

   pusher.connect(ctx.destination);
   console.log('  Creating pusher... done');
 
+  var user_text = document.getElementById('texttospeak').value;
+  
   // actual synthesis
   console.log('  Calling synthesize...');
   tts.synthesize(
-    document.getElementById('texttospeak').value,
+    user_text,
     function cb(samples, events) {
       //console.log('  Inside synt cb');
       if (!samples) {
       //console.log('  Leaving synt cb');
     } // end of function cb
   ); // end of tts.synthesize()
-  console.log('  Calling synthesize... done');
-
+  console.log('  Calling synthesize... done');  
   console.log('Leaving speak()');
+
 } // end of speak()
 
+function ipa() {
+  
+  console.log("Synthesizing ipa ... ");
+  var ts = new Date();
+  var user_text = document.getElementById('texttospeak').value;
+
+ //user_text = user_text.repeat(50);
+  
+  tts.set_voice(document.getElementById('voice').value);
+  tts.synthesize_ipa(user_text, function(result) { 
+    var te = new Date();
+    document.getElementById('ipaarea').value = result.ipa;
+    console.log("Ipa synthesis done in " + (te-ts) + " ms.")
+  });
+}
+
+function speakAndIpa() {
+  speak();
+  ipa();
+}
+
 function resetPitch() {
   document.getElementById('pitch').value = 50;
 }
       console.log('Leaving cb1');
     } // end of function cb1
   );
+    
   console.log('Creating eSpeakNG instance... done');
 }

emscripten/js/espeakng.js

     'set_rate',
     'set_pitch',
     'set_voice',
-    'synthesize'
+    'synthesize',
+    'synthesize_ipa'
     ]) {
   eSpeakNG.prototype[method] = _createAsyncMethod(method);
 }

emscripten/post.js

   Runtime.removeFunction(fp);
 };
 
+eSpeakNGWorker.prototype.synthesize_ipa = function (aText, aCallback) {
+  
+  // Use a unique temp file for the worker. Avoid collisions, just in case.
+  var ipaVirtualFileName = "espeak-ng-ipa-tmp-"  + Math.random().toString().substring(2);
+  
+  var res = "";
+  var code = this.synth_ipa_(aText, ipaVirtualFileName);
+
+  if(code == 0)
+    res = FS.readFile(ipaVirtualFileName, { encoding: 'utf8' })
+    
+  // Clean up the tmp file
+  FS.unlink(ipaVirtualFileName);
+    
+  var ret = {
+    code: code,
+    ipa: res
+  }
+  
+  return ret;
+};
+
 // Make this a worker
 
 if (typeof WorkerGlobalScope !== 'undefined') {
   });
 
   onmessage = function(e) {
+    
     if (!worker) {
       throw 'eSpeakNGWorker worker not initialized';
     }