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

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

Index: webrtc/modules/audio_processing/test/py_quality_assessment/quality_assessment/noise_generation_factory.py
diff --git a/webrtc/modules/audio_processing/test/py_quality_assessment/quality_assessment/noise_generation_factory.py b/webrtc/modules/audio_processing/test/py_quality_assessment/quality_assessment/noise_generation_factory.py
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index 0000000000000000000000000000000000000000..acb9f076759a13171016d556124ae1bfaf4a24df
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+++ b/webrtc/modules/audio_processing/test/py_quality_assessment/quality_assessment/noise_generation_factory.py
@@ -0,0 +1,37 @@
+# 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.
+
+"""NoiseGenerator factory class.
+"""
+
+import logging
+
+from . import noise_generation
+
+
+class NoiseGeneratorFactory(object):
+  """Factory class used to instantiate noise generator workers.
+
+     It can be used by instanciating a factory, passing parameters to the
+     constructor. These parameters are used to instantiate noise generator
+     workers.
+  """
+
+  def __init__(self, aechen_ir_database_path):
+    self._aechen_ir_database_path = aechen_ir_database_path
+
+  def GetInstance(self, noise_generator_class):
+    """Creates an NoiseGenerator instance given a class object.
+    """
+    logging.debug(
+        'factory producing a %s noise generator', noise_generator_class)
+    if noise_generator_class == noise_generation.EchoNoiseGenerator:
+      return noise_generation.EchoNoiseGenerator(self._aechen_ir_database_path)
+    else:
+      # By default, no arguments in the constructor.
+      return noise_generator_class()