Total Harmonic Distorsion plus noise (THD+n) score in APM-QA.

modules/audio_processing/test/py_quality_assessment/quality_assessment/data_access.py

 # Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 """Data access utility functions and classes.
 """
@@ skipping 13 matching lines @@
   os.makedirs(path)
 
 
 class Metadata(object):
   """Data access class to save and load metadata.
   """
 
   def __init__(self):
     pass
 
+  _GENERIC_METADATA_SUFFIX = '.mdata'
   _AUDIO_TEST_DATA_FILENAME = 'audio_test_data.json'
 
   @classmethod
+  def LoadFileMetadata(cls, filepath):
+    """Loads generic metadata linked to a file.
+
+    Args:
+      filepath: path to the metadata file to read.
+
+    Returns:
+      A dict.
+    """
+    with open(filepath + cls._GENERIC_METADATA_SUFFIX) as f:
+      return json.load(f)
+
+  @classmethod
+  def SaveFileMetadata(cls, filepath, metadata):
+    """Saves generic metadata linked to a file.
+
+    Args:
+      filepath: path to the metadata file to write.
+      metadata: a dict.
+    """
+    with open(filepath + cls._GENERIC_METADATA_SUFFIX, 'w') as f:
+      json.dump(metadata, f)
+
+  @classmethod
   def LoadAudioTestDataPaths(cls, metadata_path):
     """Loads the input and the reference audio track paths.
 
     Args:
       metadata_path: path to the directory containing the metadata file.
 
     Returns:
       Tuple with the paths to the input and output audio tracks.
     """
     metadata_filepath = os.path.join(
@@ skipping 73 matching lines @@
   @classmethod
   def Save(cls, filepath, score):
     """Saves a score into a file.
 
     Args:
       filepath: path to the score file.
       score: float encoding the score.
     """
     with open(filepath, 'w') as f:
       f.write('{0:f}\n'.format(score))