Add offline desktop speech with Silero Xenia for Russian

scripts/download-tts-model.py

@@ -0,0 +1,56 @@
+#!/usr/bin/env python3
+"""Download the pinned Supertonic 3 CPU model. No packages or credentials required."""
+import hashlib
+import json
+from pathlib import Path
+import sys
+import urllib.request
+
+ROOT = Path(__file__).resolve().parent.parent
+MANIFEST = json.loads((ROOT / "scripts/supertonic-3-model.json").read_text())
+
+
+def valid(path, entry):
+    if not path.is_file() or path.stat().st_size != entry["size"]:
+        return False
+    digest = hashlib.sha256() if "sha256" in entry else hashlib.sha1()
+    if "git_blob" in entry:
+        digest.update(f"blob {entry['size']}\0".encode())
+    with path.open("rb") as source:
+        for chunk in iter(lambda: source.read(1024 * 1024), b""):
+            digest.update(chunk)
+    return digest.hexdigest() == entry.get("sha256", entry.get("git_blob"))
+
+
+def download(manifest, destination):
+    total = sum(entry["size"] for entry in manifest["files"])
+    print(f"{manifest['repository']}: {total / 1e6:.1f} MB; destination: {destination}", flush=True)
+    base = f"https://huggingface.co/{manifest['repository']}/resolve/{manifest['revision']}"
+    for entry in manifest["files"]:
+        target = destination / entry["path"]
+        if valid(target, entry):
+            print(f"Verified {entry['path']}", flush=True)
+            continue
+        target.parent.mkdir(parents=True, exist_ok=True)
+        temporary = target.with_suffix(target.suffix + ".part")
+        print(f"Downloading {entry['path']} ({entry['size'] / 1e6:.1f} MB)", flush=True)
+        try:
+            with urllib.request.urlopen(f"{base}/{entry['path']}", timeout=60) as source, temporary.open("wb") as output:
+                while chunk := source.read(1024 * 1024):
+                    output.write(chunk)
+            if not valid(temporary, entry):
+                raise RuntimeError(f"Checksum mismatch: {entry['path']}")
+            temporary.replace(target)
+        finally:
+            temporary.unlink(missing_ok=True)
+
+
+def main():
+    destination = Path(sys.argv[1]) if len(sys.argv) > 1 else ROOT / ".local/tts/supertonic-3"
+    print("Supertonic model license: OpenRAIL-M (saved as LICENSE alongside the model).", flush=True)
+    download(MANIFEST, destination)
+    print("Ready. Run ./gradlew :composeApp:run and use Read aloud in a book.", flush=True)
+
+
+if __name__ == "__main__":
+    main()