APM Quality Generator, noise generator and evaluation score workers factory + echo noise generator

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

Index: webrtc/modules/audio_processing/test/py_quality_assessment/quality_assessment/eval_scores_factory.py
diff --git a/webrtc/modules/audio_processing/test/py_quality_assessment/quality_assessment/eval_scores_factory.py b/webrtc/modules/audio_processing/test/py_quality_assessment/quality_assessment/eval_scores_factory.py
new file mode 100644
index 0000000000000000000000000000000000000000..0f0639140eda48d0ca08d8d5bd441febda147660
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+++ b/webrtc/modules/audio_processing/test/py_quality_assessment/quality_assessment/eval_scores_factory.py
@@ -0,0 +1,31 @@
+# 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.
+
+import logging
+
+from . import eval_scores
+
+class EvaluationScoreWorkerFactory(object):
+  """Factory class used to instantiate evaluation score workers.
+
+     It can be used by instanciating a factory, passing parameters to the
+     constructor. These parameters are used to instantiate evaluation score
+     workers.
+  """
+
+  def __init__(self, polqa_tool_path):
+    self._polqa_tool_path = polqa_tool_path
+
+  def GetInstance(self, evaluation_score_class):
+    logging.debug(
+        'factory producing a %s evaluation score', evaluation_score_class)
+    if evaluation_score_class == eval_scores.PolqaScore:
+      return eval_scores.PolqaScore(self._polqa_tool_path)
+    else:
+      # By default, no arguments in the constructor.
+      return evaluation_score_class()