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| 1 /* |
| 2 * Copyright (c) 2016 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/level_controller/saturating_gain_estim
ator.h" |
| 12 |
| 13 #include <math.h> |
| 14 #include <algorithm> |
| 15 |
| 16 #include "webrtc/modules/audio_processing/level_controller/lc_constants.h" |
| 17 #include "webrtc/modules/audio_processing/logging/apm_data_dumper.h" |
| 18 |
| 19 namespace webrtc { |
| 20 |
| 21 SaturatingGainEstimator::SaturatingGainEstimator() { |
| 22 Initialize(); |
| 23 } |
| 24 |
| 25 SaturatingGainEstimator::~SaturatingGainEstimator() {} |
| 26 |
| 27 void SaturatingGainEstimator::Initialize() { |
| 28 saturating_gain_ = 1000.f; |
| 29 saturating_gain_hold_counter_ = 0; |
| 30 } |
| 31 |
| 32 void SaturatingGainEstimator::Update(float gain, int num_saturations) { |
| 33 bool too_many_saturations = (num_saturations > 2); |
| 34 |
| 35 if (too_many_saturations) { |
| 36 saturating_gain_ = 0.95f * gain; |
| 37 saturating_gain_hold_counter_ = 1000; |
| 38 } else { |
| 39 saturating_gain_hold_counter_ = |
| 40 std::max(0, saturating_gain_hold_counter_ - 1); |
| 41 if (saturating_gain_hold_counter_ == 0) { |
| 42 saturating_gain_ *= 1.001f; |
| 43 saturating_gain_ = std::min(kMaxLcGain, saturating_gain_); |
| 44 } |
| 45 } |
| 46 } |
| 47 |
| 48 } // namespace webrtc |
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