Using buffered signal to calculate the level of echo cancellation.

webrtc/modules/audio_processing/test/audio_processing_unittest.cc

 /*
  *  Copyright (c) 2012 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.
  */
 
@@ skipping 185 matching lines @@
   for (size_t i = 1; i < length; i++) {
     max_data = std::max(max_data, AbsValue(frame.data_[i]));
   }
 
   return max_data;
 }
 
 #if defined(WEBRTC_AUDIOPROC_FLOAT_PROFILE)
 void TestStats(const AudioProcessing::Statistic& test,
                const audioproc::Test::Statistic& reference) {
-  EXPECT_EQ(reference.instant(), test.instant);
+  EXPECT_NEAR(reference.instant(), test.instant, 1);
   EXPECT_EQ(reference.average(), test.average);
   EXPECT_EQ(reference.maximum(), test.maximum);
-  EXPECT_EQ(reference.minimum(), test.minimum);
+  EXPECT_NEAR(reference.minimum(), test.minimum, 1);
 }
 
 void WriteStatsMessage(const AudioProcessing::Statistic& output,
                        audioproc::Test::Statistic* msg) {
   msg->set_instant(output.instant);
   msg->set_average(output.average);
   msg->set_maximum(output.maximum);
   msg->set_minimum(output.minimum);
 }
 #endif
@@ skipping 2543 matching lines @@
                     std::tr1::make_tuple(16000, 32000, 48000, 32000, 25, 35),
                     std::tr1::make_tuple(16000, 32000, 32000, 32000, 25, 0),
                     std::tr1::make_tuple(16000, 32000, 16000, 32000, 25, 20),
                     std::tr1::make_tuple(16000, 16000, 48000, 16000, 35, 20),
                     std::tr1::make_tuple(16000, 16000, 32000, 16000, 40, 20),
                     std::tr1::make_tuple(16000, 16000, 16000, 16000, 0, 0)));
 #endif
 
 }  // namespace
 }  // namespace webrtc