[audio]fix audio get_window security error (#47386)

* fix window security error

* format

python/paddle/audio/functional/window.py

@@ -19,17 +19,39 @@ import paddle
 from paddle import Tensor
 
 
+class WindowFunctionRegister(object):
+    def __init__(self):
+        self._functions_dict = dict()
+
+    def register(self, func=None):
+        def add_subfunction(func):
+            name = func.__name__
+            self._functions_dict[name] = func
+            return func
+
+        return add_subfunction
+
+    def get(self, name):
+        return self._functions_dict[name]
+
+
+window_function_register = WindowFunctionRegister()
+
+
+@window_function_register.register()
 def _cat(x: List[Tensor], data_type: str) -> Tensor:
     l = [paddle.to_tensor(_, data_type) for _ in x]
     return paddle.concat(l)
 
 
+@window_function_register.register()
 def _acosh(x: Union[Tensor, float]) -> Tensor:
     if isinstance(x, float):
         return math.log(x + math.sqrt(x**2 - 1))
     return paddle.log(x + paddle.sqrt(paddle.square(x) - 1))
 
 
+@window_function_register.register()
 def _extend(M: int, sym: bool) -> bool:
     """Extend window by 1 sample if needed for DFT-even symmetry."""
     if not sym:
@@ -38,6 +60,7 @@ def _extend(M: int, sym: bool) -> bool:
         return M, False
 
 
+@window_function_register.register()
 def _len_guards(M: int) -> bool:
     """Handle small or incorrect window lengths."""
     if int(M) != M or M < 0:
@@ -46,6 +69,7 @@ def _len_guards(M: int) -> bool:
     return M <= 1
 
 
+@window_function_register.register()
 def _truncate(w: Tensor, needed: bool) -> Tensor:
     """Truncate window by 1 sample if needed for DFT-even symmetry."""
     if needed:
@@ -54,6 +78,7 @@ def _truncate(w: Tensor, needed: bool) -> Tensor:
         return w
 
 
+@window_function_register.register()
 def _general_gaussian(
     M: int, p, sig, sym: bool = True, dtype: str = 'float64'
 ) -> Tensor:
@@ -70,6 +95,7 @@ def _general_gaussian(
     return _truncate(w, needs_trunc)
 
 
+@window_function_register.register()
 def _general_cosine(
     M: int, a: float, sym: bool = True, dtype: str = 'float64'
 ) -> Tensor:
@@ -86,6 +112,7 @@ def _general_cosine(
     return _truncate(w, needs_trunc)
 
 
+@window_function_register.register()
 def _general_hamming(
     M: int, alpha: float, sym: bool = True, dtype: str = 'float64'
 ) -> Tensor:
@@ -95,6 +122,7 @@ def _general_hamming(
     return _general_cosine(M, [alpha, 1.0 - alpha], sym, dtype=dtype)
 
 
+@window_function_register.register()
 def _taylor(
     M: int, nbar=4, sll=30, norm=True, sym: bool = True, dtype: str = 'float64'
 ) -> Tensor:
@@ -151,6 +179,7 @@ def _taylor(
     return _truncate(w, needs_trunc)
 
 
+@window_function_register.register()
 def _hamming(M: int, sym: bool = True, dtype: str = 'float64') -> Tensor:
     """Compute a Hamming window.
     The Hamming window is a taper formed by using a raised cosine with
@@ -159,6 +188,7 @@ def _hamming(M: int, sym: bool = True, dtype: str = 'float64') -> Tensor:
     return _general_hamming(M, 0.54, sym, dtype=dtype)
 
 
+@window_function_register.register()
 def _hann(M: int, sym: bool = True, dtype: str = 'float64') -> Tensor:
     """Compute a Hann window.
     The Hann window is a taper formed by using a raised cosine or sine-squared
@@ -167,6 +197,7 @@ def _hann(M: int, sym: bool = True, dtype: str = 'float64') -> Tensor:
     return _general_hamming(M, 0.5, sym, dtype=dtype)
 
 
+@window_function_register.register()
 def _tukey(
     M: int, alpha=0.5, sym: bool = True, dtype: str = 'float64'
 ) -> Tensor:
@@ -200,6 +231,7 @@ def _tukey(
     return _truncate(w, needs_trunc)
 
 
+@window_function_register.register()
 def _kaiser(
     M: int, beta: float, sym: bool = True, dtype: str = 'float64'
 ) -> Tensor:
@@ -209,6 +241,7 @@ def _kaiser(
     raise NotImplementedError()
 
 
+@window_function_register.register()
 def _gaussian(
     M: int, std: float, sym: bool = True, dtype: str = 'float64'
 ) -> Tensor:
@@ -226,6 +259,7 @@ def _gaussian(
     return _truncate(w, needs_trunc)
 
 
+@window_function_register.register()
 def _exponential(
     M: int, center=None, tau=1.0, sym: bool = True, dtype: str = 'float64'
 ) -> Tensor:
@@ -245,6 +279,7 @@ def _exponential(
     return _truncate(w, needs_trunc)
 
 
+@window_function_register.register()
 def _triang(M: int, sym: bool = True, dtype: str = 'float64') -> Tensor:
     """Compute a triangular window."""
     if _len_guards(M):
@@ -262,6 +297,7 @@ def _triang(M: int, sym: bool = True, dtype: str = 'float64') -> Tensor:
     return _truncate(w, needs_trunc)
 
 
+@window_function_register.register()
 def _bohman(M: int, sym: bool = True, dtype: str = 'float64') -> Tensor:
     """Compute a Bohman window.
     The Bohman window is the autocorrelation of a cosine window.
@@ -279,6 +315,7 @@ def _bohman(M: int, sym: bool = True, dtype: str = 'float64') -> Tensor:
     return _truncate(w, needs_trunc)
 
 
+@window_function_register.register()
 def _blackman(M: int, sym: bool = True, dtype: str = 'float64') -> Tensor:
     """Compute a Blackman window.
     The Blackman window is a taper formed by using the first three terms of
@@ -289,6 +326,7 @@ def _blackman(M: int, sym: bool = True, dtype: str = 'float64') -> Tensor:
     return _general_cosine(M, [0.42, 0.50, 0.08], sym, dtype=dtype)
 
 
+@window_function_register.register()
 def _cosine(M: int, sym: bool = True, dtype: str = 'float64') -> Tensor:
     """Compute a window with a simple cosine shape."""
     if _len_guards(M):
@@ -308,7 +346,7 @@ def get_window(
     """Return a window of a given length and type.
 
     Args:
-        window (Union[str, Tuple[str, float]]): The window function applied to the signal before the Fourier transform. Supported window functions: 'hamming', 'hann', 'kaiser', 'gaussian', 'exponential', 'triang', 'bohman', 'blackman', 'cosine', 'tukey', 'taylor'.
+        window (Union[str, Tuple[str, float]]): The window function applied to the signal before the Fourier transform. Supported window functions: 'hamming', 'hann', 'kaiser', 'gaussian', 'general_gaussian', 'exponential', 'triang', 'bohman', 'blackman', 'cosine', 'tukey', 'taylor'.
         win_length (int): Number of samples.
         fftbins (bool, optional): If True, create a "periodic" window. Otherwise, create a "symmetric" window, for use in filter design. Defaults to True.
         dtype (str, optional): The data type of the return window. Defaults to 'float64'.
@@ -348,8 +386,8 @@ def get_window(
         )
 
     try:
-        winfunc = eval('_' + winstr)
-    except NameError as e:
+        winfunc = window_function_register.get('_' + winstr)
+    except KeyError as e:
         raise ValueError("Unknown window type.") from e
 
     params = (win_length,) + args