fix cartesia channel vars for streaming

lib/tasks/tts-task.js

@@ -59,10 +59,13 @@ class TtsTask extends Task {
   }
 
   async setTtsStreamingChannelVars(vendor, language, voice, credentials, ep) {
-    const {api_key, model_id, cartesia_model_id, cartesia_voice_id} = credentials;
+    const {api_key, model_id} = credentials;
     const {stability, similarity_boost, use_speaker_boost, style} = this.options;
     let obj;
 
+    this.logger.debug({credentials},
+      `setTtsStreamingChannelVars: vendor: ${vendor}, language: ${language}, voice: ${voice}`);
+
     switch (vendor) {
       case 'deepgram':
         obj = {
@@ -73,8 +76,8 @@ class TtsTask extends Task {
       case 'cartesia':
         obj = {
           CARTESIA_API_KEY: api_key,
-          CARTESIA_TTS_STREAMING_MODEL_ID: cartesia_model_id,
+          CARTESIA_TTS_STREAMING_MODEL_ID: model_id,
-          CARTESIA_TTS_STREAMING_VOICE_ID: cartesia_voice_id,
+          CARTESIA_TTS_STREAMING_VOICE_ID: voice,
           CARTESIA_TTS_STREAMING_LANGUAGE: language || 'en',
         };
         break;

lib/utils/tts-streaming-buffer.js

@@ -110,7 +110,6 @@ class TtsStreamingBuffer extends Emitter {
       return {status: 'failed', reason: `connection to ${this.vendor} failed`};
     }
 
-    const starting = this.tokens === '';
     const displayedTokens = tokens.length <= 40 ? tokens : tokens.substring(0, 40);
     const totalLength = tokens.length;
 
@@ -127,14 +126,14 @@ class TtsStreamingBuffer extends Emitter {
     }
 
     this.logger.debug(
-      `TtsStreamingBuffer:bufferTokens "${displayedTokens}" (length: ${totalLength}), starting? ${starting}`
+      `TtsStreamingBuffer:bufferTokens "${displayedTokens}" (length: ${totalLength}), starting? ${this.isEmpty}`
     );
     this.tokens += (tokens || '');
 
     const  leftoverTokens = await this._feedTokens();
 
     /* do we need to start a timer to periodically feed tokens to the endpoint? */
-    if (starting && leftoverTokens > 0) {
+    if (this.isEmpty && leftoverTokens > 0) {
       assert(!this.timer);
       this.timer = setInterval(async() => {
         const remaining = await this._feedTokens();