Add wav->ogg (opus) transcoding

server/config.example.toml

@@ -42,6 +42,8 @@ enabled = true
 server = "http://127.0.0.1:3001"
 voice = "Microsoft Sam"
 tempDir = "/tmp/msac-tts"
+# Transcode SAPI5 Waveform files to Opus. Greatly reduces bandwidth usage. Requires ffmpeg to be installed and in PATH.
+transcodeOpus = true
 wavExpirySeconds = 60
 
 [[agents]]

server/package.json

@@ -6,6 +6,7 @@
   },
   "packageManager": "yarn@4.2.2",
   "devDependencies": {
+    "@types/fluent-ffmpeg": "^2.1.24",
     "@types/node": "^20.14.10",
     "@types/ws": "^8.5.10",
     "typescript": "5.4.5"
@@ -15,6 +16,7 @@
     "@fastify/websocket": "^10.0.1",
     "discord.js": "^14.15.3",
     "fastify": "^4.28.1",
+    "fluent-ffmpeg": "^2.1.3",
     "html-entities": "^2.5.2",
     "mysql2": "^3.10.2",
     "toml": "^3.0.0",

server/src/config.ts

@@ -17,6 +17,7 @@ export interface TTSConfig {
 	server: string;
 	voice: string;
 	tempDir: string;
+	transcodeOpus: boolean;
 	wavExpirySeconds: number;
 }
 

server/src/room.ts

@@ -78,6 +78,8 @@ export class MSAgentChatRoom {
 			}
 		});
 		client.on('talk', async (message) => {
+			message = message.trim();
+			if (message.length === 0) return;
 			let msg: MSAgentChatMessage = {
 				op: MSAgentProtocolMessageType.Chat,
 				data: {

server/src/tts.ts

@@ -4,6 +4,7 @@ import { TTSConfig } from './config.js';
 import { Readable } from 'node:stream';
 import { ReadableStream } from 'node:stream/web';
 import { finished } from 'node:stream/promises';
+import ffmpeg from 'fluent-ffmpeg';
 
 export class TTSClient {
 	private config: TTSConfig;
@@ -42,7 +43,7 @@ export class TTSClient {
 
 	async synthesizeToFile(text: string, id: string): Promise<string> {
 		this.ensureDirectoryExists();
-		let wavFilename = id + '.wav';
+		let wavFilename = id + (this.config.transcodeOpus ? '.ogg' : '.wav');
 		let wavPath = path.join(this.config.tempDir, wavFilename);
 		try {
 			await fs.unlink(wavPath);
@@ -59,7 +60,14 @@ export class TTSClient {
 				voice: this.config.voice
 			})
 		});
+		if (this.config.transcodeOpus) {
+			let coder = ffmpeg(Readable.fromWeb(res.body as ReadableStream<any>))
+				.audioCodec('opus')
+				.outputFormat('ogg');
+			await finished(coder.pipe(stream));
+		} else {
 			await finished(Readable.fromWeb(res.body as ReadableStream<any>).pipe(stream));
+		}
 		await file.close();
 		this.deleteOps.set(
 			wavPath,

webapp/config.ts

@@ -1,4 +1,4 @@
 export const Config = {
 	// The server address for the webapp to connect to. The below default is the same address the webapp is hosted at.
-	serverAddress: `${window.location.protocol}//${window.location.host}`
+	serverAddress: `http://127.0.0.1:3000`
 };

yarn.lock

@@ -308,10 +308,12 @@ __metadata:
   dependencies:
     "@fastify/static": "npm:^7.0.4"
     "@fastify/websocket": "npm:^10.0.1"
+    "@types/fluent-ffmpeg": "npm:^2.1.24"
     "@types/node": "npm:^20.14.10"
     "@types/ws": "npm:^8.5.10"
     discord.js: "npm:^14.15.3"
     fastify: "npm:^4.28.1"
+    fluent-ffmpeg: "npm:^2.1.3"
     html-entities: "npm:^2.5.2"
     mysql2: "npm:^3.10.2"
     toml: "npm:^3.0.0"
@@ -1458,6 +1460,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/fluent-ffmpeg@npm:^2.1.24":
+  version: 2.1.24
+  resolution: "@types/fluent-ffmpeg@npm:2.1.24"
+  dependencies:
+    "@types/node": "npm:*"
+  checksum: 10c0/73a32f2313a0225452b5acdf7a341b9860ffcb88490ee726a1241887111cf4f2f7259d7491cf4e9b6be8316ababdd9064e085437f0b768adcfb0becc0733973c
+  languageName: node
+  linkType: hard
+
 "@types/node@npm:*, @types/node@npm:^20.14.10":
   version: 20.14.10
   resolution: "@types/node@npm:20.14.10"
@@ -1628,6 +1639,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"async@npm:^0.2.9":
+  version: 0.2.10
+  resolution: "async@npm:0.2.10"
+  checksum: 10c0/714d284dc6c3ae59f3e8b347083e32c7657ba4ffc4ff945eb152ad4fb08def27e768992fcd4d9fd3b411c6b42f1541862ac917446bf2a1acfa0f302d1001f7d2
+  languageName: node
+  linkType: hard
+
 "atomic-sleep@npm:^1.0.0":
   version: 1.0.0
   resolution: "atomic-sleep@npm:1.0.0"
@@ -2403,6 +2421,16 @@ __metadata:
   languageName: node
   linkType: hard
 
+"fluent-ffmpeg@npm:^2.1.3":
+  version: 2.1.3
+  resolution: "fluent-ffmpeg@npm:2.1.3"
+  dependencies:
+    async: "npm:^0.2.9"
+    which: "npm:^1.1.1"
+  checksum: 10c0/0397379ec3237c10b2389edeef26fdaf93f36d1b20b0f28f8945fe6d9121dcee9b0c615bf7d44edb7abd37233e0d24f0db39389668d3c86a1a2a0d59e3f4457b
+  languageName: node
+  linkType: hard
+
 "foreground-child@npm:^3.1.0":
   version: 3.2.1
   resolution: "foreground-child@npm:3.2.1"
@@ -4472,6 +4500,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"which@npm:^1.1.1":
+  version: 1.3.1
+  resolution: "which@npm:1.3.1"
+  dependencies:
+    isexe: "npm:^2.0.0"
+  bin:
+    which: ./bin/which
+  checksum: 10c0/e945a8b6bbf6821aaaef7f6e0c309d4b615ef35699576d5489b4261da9539f70393c6b2ce700ee4321c18f914ebe5644bc4631b15466ffbaad37d83151f6af59
+  languageName: node
+  linkType: hard
+
 "which@npm:^2.0.1":
   version: 2.0.2
   resolution: "which@npm:2.0.2"