support mod_google_tts_streaming (#1409)

* support mod_google_tts_streaming

* wip

* wip

lib/tasks/tts-task.js

@@ -157,6 +157,13 @@ class TtsTask extends Task {
           ...(reduceLatency && {RIMELABS_TTS_STREAMING_REDUCE_LATENCY: reduceLatency})
         };
         break;
+      case 'google':
+        obj = {
+          GOOGLE_TTS_LANGUAGE_CODE: language,
+          GOOGLE_TTS_VOICE_NAME: voice,
+          GOOGLE_APPLICATION_CREDENTIALS: JSON.stringify(credentials.credentials)
+        };
+        break;
       default:
         if (vendor.startsWith('custom:')) {
           const use_tls = custom_tts_streaming_url.startsWith('wss://');

lib/utils/constants.json

@@ -311,6 +311,11 @@
     "ConnectFailure": "deepgram_tts_streaming::connect_failed",
     "Connect": "deepgram_tts_streaming::connect"
   },
+  "GoogleTtsStreamingEvents": {
+    "Empty": "google_tts_streaming::empty",
+    "ConnectFailure": "google_tts_streaming::connect_failed",
+    "Connect": "google_tts_streaming::connect"
+  },
   "CartesiaTtsStreamingEvents": {
     "Empty": "cartesia_tts_streaming::empty",
     "ConnectFailure": "cartesia_tts_streaming::connect_failed",

lib/utils/tts-streaming-buffer.js

@@ -421,6 +421,7 @@ class TtsStreamingBuffer extends Emitter {
       'cartesia',
       'elevenlabs',
       'rimelabs',
+      'google',
       'custom'
     ].forEach((vendor) => {
       const eventClassName = `${vendor.charAt(0).toUpperCase() + vendor.slice(1)}TtsStreamingEvents`;