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| 1 /* |
| 2 * Copyright (c) 2017 The WebRTC project authors. All Rights Reserved. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license |
| 5 * that can be found in the LICENSE file in the root of the source |
| 6 * tree. An additional intellectual property rights grant can be found |
| 7 * in the file PATENTS. All contributing project authors may |
| 8 * be found in the AUTHORS file in the root of the source tree. |
| 9 */ |
| 10 |
| 11 #include "webrtc/modules/audio_processing/aec3/erl_estimator.h" |
| 12 |
| 13 #include "webrtc/test/gtest.h" |
| 14 |
| 15 namespace webrtc { |
| 16 |
| 17 namespace { |
| 18 |
| 19 void VerifyErl(const std::array<float, kFftLengthBy2Plus1>& erl, |
| 20 float reference) { |
| 21 std::for_each(erl.begin(), erl.end(), |
| 22 [reference](float a) { EXPECT_NEAR(reference, a, 0.001); }); |
| 23 } |
| 24 |
| 25 } // namespace |
| 26 |
| 27 // Verifies that the correct ERL estimates are achieved. |
| 28 TEST(ErlEstimator, Estimates) { |
| 29 std::array<float, kFftLengthBy2Plus1> X2; |
| 30 std::array<float, kFftLengthBy2Plus1> Y2; |
| 31 |
| 32 ErlEstimator estimator; |
| 33 |
| 34 // Verifies that the ERL estimate is properly reduced to lower values. |
| 35 X2.fill(500 * 1000.f * 1000.f); |
| 36 Y2.fill(10 * X2[0]); |
| 37 for (size_t k = 0; k < 200; ++k) { |
| 38 estimator.Update(X2, Y2); |
| 39 } |
| 40 VerifyErl(estimator.Erl(), 10.f); |
| 41 |
| 42 // Verifies that the ERL is not immediately increased when the ERL in the data |
| 43 // increases. |
| 44 Y2.fill(10000 * X2[0]); |
| 45 for (size_t k = 0; k < 998; ++k) { |
| 46 estimator.Update(X2, Y2); |
| 47 } |
| 48 VerifyErl(estimator.Erl(), 10.f); |
| 49 |
| 50 // Verifies that the rate of increase is 3 dB. |
| 51 estimator.Update(X2, Y2); |
| 52 VerifyErl(estimator.Erl(), 20.f); |
| 53 |
| 54 // Verifies that the maximum ERL is achieved when there are no low RLE |
| 55 // estimates. |
| 56 for (size_t k = 0; k < 1000; ++k) { |
| 57 estimator.Update(X2, Y2); |
| 58 } |
| 59 VerifyErl(estimator.Erl(), 1000.f); |
| 60 |
| 61 // Verifies that the ERL estimate is is not updated for low-level signals |
| 62 X2.fill(1000.f * 1000.f); |
| 63 Y2.fill(10 * X2[0]); |
| 64 for (size_t k = 0; k < 200; ++k) { |
| 65 estimator.Update(X2, Y2); |
| 66 } |
| 67 VerifyErl(estimator.Erl(), 1000.f); |
| 68 } |
| 69 |
| 70 } // namespace webrtc |
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