Evaluation controller, evaluation score abstract class, and score data access.

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

Index: webrtc/modules/audio_processing/test/py_quality_assessment/quality_assessment/data_access.py
diff --git a/webrtc/modules/audio_processing/test/py_quality_assessment/quality_assessment/data_access.py b/webrtc/modules/audio_processing/test/py_quality_assessment/quality_assessment/data_access.py
index 0dd7dde636ae48842c14b4a79a063b5807751f2a..717bd2543985ec0e412f6476bc738b6e717b8dfc 100644
--- a/webrtc/modules/audio_processing/test/py_quality_assessment/quality_assessment/data_access.py
+++ b/webrtc/modules/audio_processing/test/py_quality_assessment/quality_assessment/data_access.py
@@ -69,3 +69,22 @@ class AudioProcConfigFile(object):
   def save(cls, filepath, config):
     with open(filepath, 'w') as f:
       json.dump(config, f)
+
+
+class ScoreFile(object):
+  """
+  Data access class to save and load float scalar scores.
+  """
+
+  def __init__(self):
+    pass
+
+  @classmethod
+  def load(cls, filepath):
+    with open(filepath) as f:
+      return float(f.readline().strip())
+
+  @classmethod
+  def save(cls, filepath, score):
+    with open(filepath, 'w') as f:
+      f.write('{0:f}\n'.format(score))