Update piper TTS wrapper with auto-discovery and espeak_data path for Windows

Solvers/piper/piper_tts_wrapper.py

@@ -14,28 +14,68 @@ import json
 import subprocess
 import os
 
+
+def find_piper_exe():
+    """Find the piper executable in known HyperTwist solver paths or PATH."""
+    script_dir = os.path.dirname(os.path.abspath(__file__))
+    candidates = [
+        os.path.join(script_dir, "piper", "piper", "piper.exe"),
+        os.path.join(script_dir, "..", "..", "..", "Binaries", "Win64", "Solvers", "piper", "piper", "piper.exe"),
+        os.path.join(script_dir, "piper", "piper.exe"),
+        os.path.join(script_dir, "..", "piper", "piper", "piper.exe"),
+        "piper",
+        "piper.exe",
+    ]
+    for candidate in candidates:
+        resolved = os.path.abspath(candidate)
+        if os.path.isfile(resolved):
+            return resolved
+    return None
+
+
+def find_espeak_data(piper_exe):
+    """Locate espeak-ng-data directory next to the piper executable."""
+    exe_dir = os.path.dirname(os.path.abspath(piper_exe))
+    candidates = [
+        os.path.join(exe_dir, "espeak-ng-data"),
+        os.path.join(exe_dir, "..", "espeak-ng-data"),
+    ]
+    for candidate in candidates:
+        resolved = os.path.abspath(candidate)
+        if os.path.isdir(resolved):
+            return resolved
+    return None
+
+
 def synthesize(text: str, model_path: str, config_path: str, output_path: str) -> str:
     """Synthesize speech using piper."""
     if not os.path.exists(model_path):
         return f"ERROR: Model not found: {model_path}"
-    
-    # Try using piper directly if available in PATH
+
+    piper_exe = find_piper_exe()
+    if not piper_exe:
+        return "ERROR: piper executable not found. Place it in Solvers/piper/piper/ or add to PATH."
+
+    espeak_data = find_espeak_data(piper_exe)
+
+    cmd = [
+        piper_exe,
+        "--model", os.path.abspath(model_path),
+        "--config", os.path.abspath(config_path),
+        "--output_file", os.path.abspath(output_path),
+    ]
+    if espeak_data:
+        cmd.extend(["--espeak_data", espeak_data])
+
     try:
-        cmd = [
-            "piper",
-            "--model", model_path,
-            "--config", config_path,
-            "--output_file", output_path
-        ]
         result = subprocess.run(cmd, input=text, text=True, capture_output=True, timeout=60)
         if result.returncode == 0:
-            return output_path
+            return os.path.abspath(output_path)
         return f"ERROR: {result.stderr}"
-    except FileNotFoundError:
-        return "ERROR: piper executable not found in PATH. Install piper or compile from .external/piper"
     except Exception as e:
         return f"ERROR: {e}"
 
+
 if __name__ == "__main__":
     parser = argparse.ArgumentParser(description="HyperTwist Piper TTS Wrapper")
     parser.add_argument("--text", required=True, help="Text to synthesize")