support whisper tts (#255)

* support whisper tts

* wip

* update speech util version

lib/utils/speech-utils.js

@@ -228,6 +228,23 @@ const testElevenlabs = async(logger, credentials) => {
   }
 };
 
+const testWhisper = async(logger, synthAudio, credentials) => {
+  try {
+    await synthAudio({increment: () => {}, histogram: () => {}},
+      {
+        vendor: 'whisper',
+        credentials,
+        language: 'en-US',
+        voice: 'alloy',
+        text: 'Hi there and welcome to jambones!'
+      }
+    );
+  } catch (err) {
+    logger.info({err}, 'synthEvenlabs returned error');
+    throw err;
+  }
+};
+
 const testIbmTts = async(logger, getTtsVoices, credentials) => {
   const {tts_api_key, tts_region} = credentials;
   const voices = await getTtsVoices({vendor: 'ibm', credentials: {tts_api_key, tts_region}});
@@ -386,6 +403,10 @@ function decryptCredential(obj, credential, logger, isObscureKey = true) {
   } else if ('assemblyai' === obj.vendor) {
     const o = JSON.parse(decrypt(credential));
     obj.api_key = isObscureKey ? obscureKey(o.api_key) : o.api_key;
+  } else if ('whisper' === obj.vendor) {
+    const o = JSON.parse(decrypt(credential));
+    obj.api_key = isObscureKey ? obscureKey(o.api_key) : o.api_key;
+    obj.model_id = o.model_id;
   }
 }
 
@@ -407,5 +428,6 @@ module.exports = {
   testElevenlabs,
   testAssemblyStt,
   getSpeechCredential,
-  decryptCredential
+  decryptCredential,
+  testWhisper
 };