initial changes for major tts revamp

lib/tasks/say.js

@@ -9,31 +9,32 @@ class TaskSay extends Task {
     this.text = this.data.text;
     this.loop = this.data.loop || 1;
     this.earlyMedia = this.data.earlyMedia === true || (parentTask && parentTask.earlyMedia);
-    if (this.data.synthesizer) {
-      this.voice = this.data.synthesizer.voice;
-      switch (this.data.synthesizer.vendor) {
-        case 'google':
-          this.ttsEngine = 'google_tts';
-          break;
-        default:
-          throw new Error(`unsupported tts vendor ${this.data.synthesizer.vendor}`);
-      }
-    }
+    this.synthesizer = this.data.synthesizer || {};
   }
 
   get name() { return TaskName.Say; }
 
   async exec(cs, ep) {
+    const {srf} = cs;
+    const {synthAudio} = srf.locals.dbHelpers;
     super.exec(cs);
     this.ep = ep;
     try {
+      let filepath;
+      const opts = Object.assign({
+        text: this.text,
+        vendor: cs.speechSynthesisVendor,
+        language: cs.speechSynthesisLanguage,
+        voice: cs.speechSynthesisVoice
+      }, this.synthesizer);
+
       while (!this.killed && this.loop--) {
         this.logger.debug(`TaskSay: remaining loops ${this.loop}`);
-        await ep.speak({
-          ttsEngine: 'google_tts',
-          voice: this.voice || this.callSession.speechSynthesisVoice,
-          text: this.text
-        });
+        if (!filepath) {
+          filepath = await synthAudio(opts);
+          cs.trackTmpFile(filepath);
+        }
+        await ep.play(filepath);
       }
     } catch (err) {
       this.logger.info(err, 'TaskSay:exec error');