Fix TTS playback and preinstall mecab

docker/melotts/Dockerfile

@@ -12,6 +12,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 
 RUN git clone https://github.com/myshell-ai/MeloTTS.git /opt/MeloTTS
 RUN pip install --no-cache-dir -e /opt/MeloTTS
+RUN pip install --no-cache-dir python-mecab-ko python-mecab-ko-dic
 RUN python -m unidic download
 RUN python /opt/MeloTTS/melo/init_downloads.py
 

src/services/audio-playback.ts

@@ -1,11 +1,12 @@
 import { spawn } from "node:child_process";
 import process from "node:process";
 
-async function run(command: string, args: string[]): Promise<void> {
+async function run(command: string, args: string[], env?: NodeJS.ProcessEnv): Promise<void> {
   await new Promise<void>((resolve, reject) => {
     const child = spawn(command, args, {
       stdio: ["ignore", "inherit", "inherit"],
       windowsHide: true,
+      env,
     });
 
     child.on("error", reject);
@@ -21,6 +22,11 @@ async function run(command: string, args: string[]): Promise<void> {
 
 export async function playWavFile(filePath: string): Promise<void> {
   if (process.platform === "win32") {
+    const env = {
+      ...process.env,
+      TTS_WAV_PATH: filePath,
+    };
+
     await run("powershell.exe", [
       "-NoProfile",
       "-NonInteractive",
@@ -28,13 +34,12 @@ export async function playWavFile(filePath: string): Promise<void> {
       "Bypass",
       "-Command",
       [
-        "$path = $args[0]",
+        "$path = $env:TTS_WAV_PATH",
         "$player = New-Object System.Media.SoundPlayer $path",
         "$player.Load()",
         "$player.PlaySync()",
       ].join("; "),
-      filePath,
+    ], env);
-    ]);
     return;
   }