Added forced zero AEC output after call startup and echo path changes

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.
  */
 
@@ skipping 15 matching lines @@
   std::array<float, kFftLengthBy2Plus1> R2;
   std::array<float, kFftLengthBy2Plus1> N2;
   E2.fill(0.f);
   R2.fill(0.f);
   N2.fill(0.f);
   float high_bands_gain;
   EXPECT_DEATH(SuppressionGain(DetectOptimization())
                    .GetGain(E2, R2, N2, false,
                             std::vector<std::vector<float>>(
                                 3, std::vector<float>(kBlockSize, 0.f)),
-                            1, &high_bands_gain, nullptr),
+                            1, false, &high_bands_gain, nullptr),
                "");
 }
 
 #endif
 
 #if defined(WEBRTC_ARCH_X86_FAMILY)
 // Verifies that the optimized methods are bitexact to their reference
 // counterparts.
 TEST(SuppressionGain, TestOptimizations) {
   if (WebRtc_GetCPUInfo(kSSE2) != 0) {
@@ skipping 74 matching lines @@
   std::array<float, kFftLengthBy2Plus1> R2;
   std::array<float, kFftLengthBy2Plus1> N2;
   std::array<float, kFftLengthBy2Plus1> g;
   std::vector<std::vector<float>> x(1, std::vector<float>(kBlockSize, 0.f));
 
   // 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, false, x, 1, &high_bands_gain, &g);
+    suppression_gain.GetGain(E2, R2, N2, false, x, 1, false, &high_bands_gain,
+                             &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, false, x, 1, &high_bands_gain, &g);
+    suppression_gain.GetGain(E2, R2, N2, false, x, 1, false, &high_bands_gain,
+                             &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, false, x, 1, &high_bands_gain, &g);
+    suppression_gain.GetGain(E2, R2, N2, false, x, 1, false, &high_bands_gain,
+                             &g);
   }
   std::for_each(g.begin(), g.end(),
                 [](float a) { EXPECT_NEAR(0.f, a, 0.001); });
+
+  // Verify the functionality for forcing a zero gain.
+  suppression_gain.GetGain(E2, R2, N2, false, x, 1, true, &high_bands_gain, &g);
+  std::for_each(g.begin(), g.end(), [](float a) { EXPECT_FLOAT_EQ(0.f, a); });
+  EXPECT_FLOAT_EQ(0.f, high_bands_gain);
 }
 
 }  // namespace aec3
 }  // namespace webrtc