Add Google realtime voice options

src/app/api/tts/voices/route.ts

@@ -2,7 +2,7 @@ import { NextRequest, NextResponse } from "next/server";
 import { execFile } from "node:child_process";
 import { promisify } from "node:util";
 import { requireAuth } from "@/lib/require-auth";
-import { OPENAI_TTS_VOICES, type TtsVoiceOption, type TtsProviderId } from "@/lib/tts-voices";
+import { GOOGLE_REALTIME_VOICES, OPENAI_TTS_VOICES, type TtsVoiceOption, type TtsProviderId } from "@/lib/tts-voices";
 
 export const dynamic = "force-dynamic";
 
@@ -19,7 +19,7 @@ export async function GET(request: NextRequest) {
   const provider = normalizeProvider(request.nextUrl.searchParams.get("provider"));
   const query = (request.nextUrl.searchParams.get("q") || "").trim().toLowerCase();
 
-  const providers: TtsProviderId[] = provider === "all" ? ["openai", "elevenlabs", "say", "browser"] : [provider];
+  const providers: TtsProviderId[] = provider === "all" ? ["openai", "google", "elevenlabs", "say", "browser"] : [provider];
   const settled = await Promise.allSettled(providers.map((p) => listProviderVoices(p)));
   const voices = settled.flatMap((result) => result.status === "fulfilled" ? result.value : []);
   const filtered = query
@@ -34,14 +34,16 @@ export async function GET(request: NextRequest) {
 }
 
 function normalizeProvider(value: string | null): ProviderFilter {
-  if (value === "openai" || value === "elevenlabs" || value === "say" || value === "browser") return value;
+  if (value === "openai" || value === "google" || value === "elevenlabs" || value === "say" || value === "browser") return value;
   return "all";
 }
 
 async function listProviderVoices(provider: TtsProviderId): Promise<TtsVoiceOption[]> {
   switch (provider) {
     case "openai":
       return OPENAI_TTS_VOICES;
+    case "google":
+      return GOOGLE_REALTIME_VOICES;
     case "elevenlabs":
       return listElevenLabsVoices();
     case "say":

src/lib/realtime-voice-client.test.ts

@@ -131,6 +131,19 @@ describe("realtime voice client helpers", () => {
     });
   });
 
+  it("maps Google voice selections to realtime session settings", () => {
+    expect(resolveRealtimeVoiceSessionSettings({
+      enabled: true,
+      provider: "google",
+      voiceId: "Kore",
+      model: "gemini-2.5-flash-native-audio-preview-12-2025",
+    })).toEqual({
+      provider: "google",
+      voice: "Kore",
+      model: "gemini-2.5-flash-native-audio-preview-12-2025",
+    });
+  });
+
   it("does not forward non-realtime TTS voice settings", () => {
     expect(resolveRealtimeVoiceSessionSettings({
       enabled: true,

src/lib/realtime-voice-client.ts

@@ -1,4 +1,5 @@
 import {
+  GOOGLE_REALTIME_VOICE_IDS,
   OPENAI_REALTIME_VOICE_IDS,
   normalizeAgentVoiceSettings,
   type AgentVoiceSettings,
@@ -90,10 +91,20 @@ export function resolveRealtimeVoiceSessionSettings(
   voiceSettings?: AgentVoiceSettings | null,
 ): Pick<RealtimeVoiceSessionRequest, "provider" | "model" | "voice"> {
   const voice = normalizeAgentVoiceSettings(voiceSettings);
-  if (voice.enabled === false || voice.provider !== "openai") return {};
+  if (voice.enabled === false) return {};
 
-  const voiceId = voice.voiceId?.trim().toLowerCase();
+  const rawVoiceId = voice.voiceId?.trim();
+  const voiceId = rawVoiceId?.toLowerCase();
   const model = voice.model?.trim();
+  if (voice.provider === "google") {
+    return {
+      provider: "google",
+      voice: voiceId && GOOGLE_REALTIME_VOICE_IDS.has(voiceId) ? rawVoiceId : undefined,
+      model: model?.includes("native-audio") || model?.includes("live") ? model : undefined,
+    };
+  }
+  if (voice.provider !== "openai") return {};
+
   return {
     provider: "openai",
     voice: voiceId && OPENAI_REALTIME_VOICE_IDS.has(voiceId) ? voiceId : undefined,

src/lib/tts-voices.ts

@@ -1,4 +1,4 @@
-export type TtsProviderId = "openai" | "elevenlabs" | "say" | "browser";
+export type TtsProviderId = "openai" | "google" | "elevenlabs" | "say" | "browser";
 
 export interface TtsVoiceOption {
   id: string;
@@ -22,6 +22,7 @@ export interface AgentVoiceSettings {
 export const TTS_PROVIDER_OPTIONS: Array<{ value: TtsProviderId | "auto"; label: string; description: string }> = [
   { value: "auto", label: "Auto", description: "Use the best available device or configured backend voice" },
   { value: "openai", label: "OpenAI", description: "Cloud neural voices" },
+  { value: "google", label: "Google", description: "Gemini realtime voices" },
   { value: "elevenlabs", label: "ElevenLabs", description: "Large voice library when configured" },
   { value: "say", label: "macOS say", description: "Local system voices" },
   { value: "browser", label: "Browser", description: "Web Speech voices on this device" },
@@ -55,6 +56,15 @@ export const OPENAI_REALTIME_VOICE_IDS = new Set([
   "verse",
 ]);
 
+export const GOOGLE_REALTIME_VOICES: TtsVoiceOption[] = [
+  { id: "Kore", name: "Kore", provider: "google", description: "Gemini realtime default" },
+  { id: "Puck", name: "Puck", provider: "google", description: "Gemini realtime voice" },
+];
+
+export const GOOGLE_REALTIME_VOICE_IDS = new Set(
+  GOOGLE_REALTIME_VOICES.map((voice) => voice.id.toLowerCase()),
+);
+
 export const DEFAULT_AGENT_VOICE_SETTINGS: AgentVoiceSettings = {
   enabled: true,
   provider: "auto",
@@ -104,5 +114,9 @@ export function shouldUseDeviceTts(voice: AgentVoiceSettings) {
 }
 
 export function isRealtimeVoiceOption(voice: Pick<TtsVoiceOption, "provider" | "id">) {
-  return voice.provider === "openai" && OPENAI_REALTIME_VOICE_IDS.has(voice.id.trim().toLowerCase());
+  const voiceId = voice.id.trim().toLowerCase();
+  return (
+    (voice.provider === "openai" && OPENAI_REALTIME_VOICE_IDS.has(voiceId)) ||
+    (voice.provider === "google" && GOOGLE_REALTIME_VOICE_IDS.has(voiceId))
+  );
 }