support dial translate

lib/tasks/dial.js

@@ -110,6 +110,7 @@ class TaskDial extends Task {
     this.tag = this.data.tag;
     this.boostAudioSignal = this.data.boostAudioSignal;
     this._mediaPath = MediaPath.FullMedia;
+    this.translate = this.data.translate;
 
     if (this.dtmfHook) {
       const {parentDtmfCollector, childDtmfCollector} = parseDtmfOptions(logger, this.data.dtmfCapture || {});
@@ -158,6 +159,7 @@ class TaskDial extends Task {
 
   get canReleaseMedia() {
     const keepAnchor = this.data.anchorMedia ||
+      this.data.translate ||
       this.cs.isBackGroundListen ||
       this.cs.onHoldMusic ||
       ANCHOR_MEDIA_ALWAYS ||
@@ -291,6 +293,17 @@ class TaskDial extends Task {
       this.transcribeTask.span.end();
       this.transcribeTask = null;
     }
+    if (this.llmTask) {
+      await this.llmTask.kill(cs);
+      this.llmTask.span.end();
+      this.llmTask = null;
+    }
+
+    if (this.sdLlmTask) {
+      await this.sdLlmTask.kill(cs);
+      this.sdLlmTask.span.end();
+      this.sdLlmTask = null;
+    }
     this.notifyTaskDone();
   }
 
@@ -758,6 +771,30 @@ class TaskDial extends Task {
     this._killOutdials();       // NB: order is important
   }
 
+  async _startTranslate(cs, sd) {
+    if (this.translate) {
+      const {callerLanguage, calleeLanguage, gain} = this.translate;
+      assert(this.translate.llm, 'Dial:_startTranslate - missing llm in translate');
+      this.logger.debug('Dial:_startTranslate start llm services');
+      // setup caller LLM task
+      this.llmTask = makeTask(this.logger, {'llm': this.translate.llm});
+      this.llmTask.configureDialTranslate({
+        language: callerLanguage,
+        gain,
+      });
+
+      // setup callee LLM task
+      this.sdLlmTask = makeTask(this.logger, {'llm': this.translate.llm});
+      this.sdLlmTask.configureDialTranslate({
+        language: calleeLanguage,
+        gain,
+      });
+
+      this.llmTask.exec(cs, {ep: this.ep});
+      this.sdLlmTask.exec(cs, {ep: sd.ep});
+    }
+  }
+
   async _onReinvite(req, res) {
     try {
       let isHandled = false;