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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_mixer/gain_change_calculator.h" |
| 12 |
| 13 #include <math.h> |
| 14 #include <vector> |
| 15 |
| 16 namespace webrtc { |
| 17 |
| 18 namespace { |
| 19 constexpr int16_t kReliabilityThreshold = 100; |
| 20 } // namespace |
| 21 |
| 22 float GainChangeCalculator::CalculateGainChange( |
| 23 rtc::ArrayView<const int16_t> in, |
| 24 rtc::ArrayView<const int16_t> out) { |
| 25 RTC_DCHECK_EQ(in.size(), out.size()); |
| 26 |
| 27 std::vector<float> gain(in.size()); |
| 28 CalculateGain(in, out, gain); |
| 29 return CalculateDifferences(gain); |
| 30 } |
| 31 |
| 32 void GainChangeCalculator::CalculateGain(rtc::ArrayView<const int16_t> in, |
| 33 rtc::ArrayView<const int16_t> out, |
| 34 rtc::ArrayView<float> gain) { |
| 35 RTC_DCHECK_EQ(in.size(), out.size()); |
| 36 RTC_DCHECK_EQ(in.size(), gain.size()); |
| 37 |
| 38 for (size_t i = 0; i < in.size(); ++i) { |
| 39 if (std::abs(in[i]) >= kReliabilityThreshold) { |
| 40 last_reliable_gain_ = out[i] / static_cast<float>(in[i]); |
| 41 } |
| 42 gain[i] = last_reliable_gain_; |
| 43 } |
| 44 } |
| 45 |
| 46 float GainChangeCalculator::CalculateDifferences( |
| 47 rtc::ArrayView<const float> values) { |
| 48 float res = 0; |
| 49 for (float f : values) { |
| 50 res += fabs(f - last_value_); |
| 51 last_value_ = f; |
| 52 } |
| 53 return res; |
| 54 } |
| 55 } // namespace webrtc |
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