Added Google TTS, lowercase voices so that people don't have to remember ridiculous case

tts/azure/index.js

@@ -10,7 +10,7 @@ module.exports = class AzureTTS extends BaseEngine {
     }
 
     getDefaultVoice() {
-        return "";
+        return "Aria";
     }
 
     getSpeechFile(text, filepath, voice = this.getDefaultVoice(), params = {}) {
@@ -48,7 +48,7 @@ module.exports = class AzureTTS extends BaseEngine {
         json.forEach((voice) => {
             if (this.voices[voice.DisplayName]) {
                 if (voice.Name.includes('Neural')) {
-                    this.voices[voice.DisplayName] = voice.ShortName;
+                    this.voices[voice.DisplayName.toLowerCase()] = voice.ShortName;
                 }
             } else {
                 this.voices[voice.DisplayName] = voice.ShortName;

tts/google/index.js

@@ -0,0 +1,36 @@
+const BaseEngine = require('../BaseEngine')
+const sdk = require('@google-cloud/text-to-speech');
+const fs = require('fs');
+const util = require('util');
+
+module.exports = class GoogleCloudTTS extends BaseEngine {
+    constructor() {
+        super('google', 'Google Cloud TTS', 'wav');
+        this.client = new sdk.TextToSpeechClient();
+        this.client.initialize();
+        this.voices = {};
+        this.populateVoiceList();
+    }
+    async populateVoiceList() {
+        const [result] = await this.client.listVoices({});
+        const voiceList = result.voices;
+        voiceList.forEach((voice) => {
+            console.log(voice)
+            this.voices[voice.name.toLowerCase()] = { name: voice.name, lang: voice.languageCodes[0] };
+        });
+    }
+    getDefaultVoice() {
+        return 'en-US-Wavenet-A';
+    }
+    async getSpeechFile(text, filepath, voice = this.getDefaultVoice(), params = {}) {
+        const request = {
+            input: { text: text },
+            voice: { name: this.voices[voice].name, languageCode: this.voices[voice].lang },
+            audioConfig: { audioEncoding: 'OGG_OPUS', effectsProfileId: ['medium-bluetooth-speaker-class-device'] },
+        };
+        let [response] = await this.client.synthesizeSpeech(request);
+        const writeFile = util.promisify(fs.writeFile);
+        await writeFile(filepath, response.audioContent, 'binary');
+        return filepath;
+    }
+}