feat pause resume transcribe (#438)

* feat pause resume transcribe

* wip

* fix jslint

* update fsmrf

lib/tasks/transcribe.js

@@ -9,7 +9,8 @@ const {
   SonioxTranscriptionEvents,
   IbmTranscriptionEvents,
   NvidiaTranscriptionEvents,
-  JambonzTranscriptionEvents
+  JambonzTranscriptionEvents,
+  TranscribeStatus
 } = require('../utils/constants');
 const { normalizeJambones } = require('@jambonz/verb-specifications');
 const SttTask = require('./stt-task');
@@ -119,8 +120,7 @@ class TaskTranscribe extends SttTask {
     this.removeSpeechListeners(ep);
   }
 
-  async kill(cs) {
-    super.kill(cs);
+  async _stopTranscription() {
     let stopTranscription = false;
     if (this.ep?.connected) {
       stopTranscription = true;
@@ -132,6 +132,13 @@ class TaskTranscribe extends SttTask {
       this.ep2.stopTranscription({vendor: this.vendor})
         .catch((err) => this.logger.info(err, 'Error TaskTranscribe:kill'));
     }
+
+    return stopTranscription;
+  }
+
+  async kill(cs) {
+    super.kill(cs);
+    const stopTranscription = this._stopTranscription();
     // hangup after 1 sec if we don't get a final transcription
     if (stopTranscription) this._timer = setTimeout(() => this.notifyTaskDone(), 1500);
     else this.notifyTaskDone();
@@ -139,6 +146,23 @@ class TaskTranscribe extends SttTask {
     await this.awaitTaskDone();
   }
 
+  async updateTranscribe(status) {
+    if (!this.killed && this.ep && this.ep.connected) {
+      this.logger.info(`TaskTranscribe:updateTranscribe status ${status}`);
+      switch (status) {
+        case TranscribeStatus.Pause:
+          await this._stopTranscription();
+          break;
+        case TranscribeStatus.Resume:
+          await this._startTranscribing(this.cs, this.ep, 1);
+          if (this.separateRecognitionPerChannel && this.ep2) {
+            await this._startTranscribing(this.cs, this.ep2, 2);
+          }
+          break;
+      }
+    }
+  }
+
   async _startTranscribing(cs, ep, channel) {
     const opts = this.setChannelVarsForStt(this, this.sttCredentials, this.data.recognizer);
     switch (this.vendor) {