Support Deepgram TTS (#755)

Author: paulheinrichs-jb

.changeset/thick-chicken-raise.md

@@ -0,0 +1,5 @@
+---
+'@livekit/agents-plugin-deepgram': patch
+---
+
+Support deepgram tts

README.md

@@ -65,7 +65,7 @@ Currently, only the following plugins are supported:
 | ---------------------------------------------------------------------------------------------------- | ------------- |
 | [@livekit/agents-plugin-openai](https://www.npmjs.com/package/@livekit/agents-plugin-openai)         | LLM, TTS, STT |
 | [@livekit/agents-plugin-google](https://www.npmjs.com/package/@livekit/agents-plugin-google)         | LLM, TTS      |
-| [@livekit/agents-plugin-deepgram](https://www.npmjs.com/package/@livekit/agents-plugin-deepgram)     | STT           |
+| [@livekit/agents-plugin-deepgram](https://www.npmjs.com/package/@livekit/agents-plugin-deepgram)     | STT, TTS      |
 | [@livekit/agents-plugin-elevenlabs](https://www.npmjs.com/package/@livekit/agents-plugin-elevenlabs) | TTS           |
 | [@livekit/agents-plugin-cartesia](https://www.npmjs.com/package/@livekit/agents-plugin-cartesia)     | TTS           |
 | [@livekit/agents-plugin-neuphonic](https://www.npmjs.com/package/@livekit/agents-plugin-neuphonic)   | TTS           |

plugins/deepgram/src/index.ts

@@ -4,6 +4,7 @@
 import { Plugin } from '@livekit/agents';
 
 export * from './stt.js';
+export * from './tts.js';
 
 class DeepgramPlugin extends Plugin {
   constructor() {

plugins/deepgram/src/models.ts

@@ -2,6 +2,22 @@
 //
 // SPDX-License-Identifier: Apache-2.0
 
+export type TTSModels =
+  | 'aura-asteria-en'
+  | 'aura-luna-en'
+  | 'aura-stella-en'
+  | 'aura-athena-en'
+  | 'aura-hera-en'
+  | 'aura-orion-en'
+  | 'aura-arcas-en'
+  | 'aura-perseus-en'
+  | 'aura-angus-en'
+  | 'aura-orpheus-en'
+  | 'aura-helios-en'
+  | 'aura-zeus-en';
+
+export type TTSEncoding = 'linear16' | 'mulaw' | 'alaw' | 'mp3' | 'opus' | 'flac' | 'aac';
+
 export type STTModels =
   | 'nova-general'
   | 'nova-phonecall'

plugins/deepgram/src/tts.test.ts

@@ -0,0 +1,11 @@
+// SPDX-FileCopyrightText: 2024 LiveKit, Inc.
+//
+// SPDX-License-Identifier: Apache-2.0
+import { STT } from '@livekit/agents-plugin-deepgram';
+import { tts } from '@livekit/agents-plugins-test';
+import { describe } from 'vitest';
+import { TTS } from './tts.js';
+
+describe('Deepgram', async () => {
+  await tts(new TTS(), new STT());
+});