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

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

Index: modules/audio_processing/test/py_quality_assessment/quality_assessment/data_access.py
diff --git a/modules/audio_processing/test/py_quality_assessment/quality_assessment/data_access.py b/modules/audio_processing/test/py_quality_assessment/quality_assessment/data_access.py
index 826a0899abd7830ad03248fe612b449431a8cddb..c488859b8908d79f6e034e9b6eb2a166daf0e88f 100644
--- a/modules/audio_processing/test/py_quality_assessment/quality_assessment/data_access.py
+++ b/modules/audio_processing/test/py_quality_assessment/quality_assessment/data_access.py
@@ -31,8 +31,33 @@ class Metadata(object):
   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.