Finalization of the first version of EchoCanceller 3

webrtc/modules/audio_processing/aec3/suppression_gain_unittest.cc

+/*
+ *  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.
+ */
+
+#include "webrtc/modules/audio_processing/aec3/suppression_gain.h"
+
+#include "webrtc/test/gtest.h"
+
+namespace webrtc {
+
+#if RTC_DCHECK_IS_ON && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
+
+// Verifies that the check for non-null output gains works.
+TEST(SuppressionGain, NullOutputGains) {
+  std::array<float, kFftLengthBy2Plus1> E2;
+  std::array<float, kFftLengthBy2Plus1> R2;
+  std::array<float, kFftLengthBy2Plus1> N2;
+  EXPECT_DEATH(SuppressionGain().GetGain(E2, R2, N2, 0.1f, nullptr), "");
+}
+
+#endif
+
+// Does a sanity check that the gains are correctly computed.
+TEST(SuppressionGain, BasicGainComputation) {
+  SuppressionGain suppression_gain;
+  std::array<float, kFftLengthBy2Plus1> E2;
+  std::array<float, kFftLengthBy2Plus1> R2;
+  std::array<float, kFftLengthBy2Plus1> N2;
+  std::array<float, kFftLengthBy2Plus1> g;
+
+  // Ensure that a strong noise is detected to mask any echoes.
+  E2.fill(10.f);
+  R2.fill(0.1f);
+  N2.fill(100.f);
+  for (int k = 0; k < 10; ++k) {
+    suppression_gain.GetGain(E2, R2, N2, 0.1f, &g);
+  }
+  std::for_each(g.begin(), g.end(),
+                [](float a) { EXPECT_NEAR(1.f, a, 0.001); });
+
+  // Ensure that a strong nearend is detected to mask any echoes.
+  E2.fill(100.f);
+  R2.fill(0.1f);
+  N2.fill(0.f);
+  for (int k = 0; k < 10; ++k) {
+    suppression_gain.GetGain(E2, R2, N2, 0.1f, &g);
+  }
+  std::for_each(g.begin(), g.end(),
+                [](float a) { EXPECT_NEAR(1.f, a, 0.001); });
+
+  // Ensure that a strong echo is suppressed.
+  E2.fill(0.1f);
+  R2.fill(100.f);
+  N2.fill(0.f);
+  for (int k = 0; k < 10; ++k) {
+    suppression_gain.GetGain(E2, R2, N2, 0.1f, &g);
+  }
+  std::for_each(g.begin(), g.end(),
+                [](float a) { EXPECT_NEAR(0.f, a, 0.001); });
+}
+
+}  // namespace webrtc