For the LogMel: initializing the Mel features in the init method inst…

…ead of the compute_features method.

msaf/features.py

@@ -200,11 +200,8 @@ def __init__(self, file_struct, feat_type, sr=config.sample_rate,
         # Init the parent
         super().__init__(file_struct=file_struct, sr=sr, hop_length=hop_length,
                          feat_type=feat_type)
-        self.n_fft = n_fft
-        # Init the Mel parameters
-        self.n_mels = n_mels
-        self.f_min = f_min
-        self.f_max = f_max
+        self.mel = Mel(self.file_struct, self.feat_type, self.sr,self.hop_length, 
+                       n_fft,n_mels, f_min, f_max).features
 
     @classmethod
     def get_id(cls):
@@ -220,11 +217,7 @@ def compute_features(self):
             The features, each row representing a feature vector for a give
             time frame/beat.
         """
-        mel = Mel(self.file_struct, self.feat_type, self.sr,
-                 self.hop_length, self.n_fft,
-                 self.n_mels, self.f_min, 
-                 self.f_max).features
-        return librosa.power_to_db(mel)
+        return librosa.power_to_db(self.mel)
 
 class MFCC(Features):
     """This class contains the implementation of the MFCC Features.