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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/agc2/digital_gain_applier.h" |
| 12 |
| 13 #include <algorithm> |
| 14 |
| 15 namespace webrtc { |
| 16 namespace { |
| 17 |
| 18 constexpr float kMaxSampleValue = 32767.0f; |
| 19 constexpr float kMinSampleValue = -32767.0f; |
| 20 |
| 21 } // namespace |
| 22 |
| 23 DigitalGainApplier::DigitalGainApplier() = default; |
| 24 |
| 25 void DigitalGainApplier::Process(float gain, rtc::ArrayView<float> samples) { |
| 26 if (gain == 1.f) { return; } |
| 27 for (auto& v : samples) { v *= gain; } |
| 28 LimitToAllowedRange(samples); |
| 29 } |
| 30 |
| 31 void DigitalGainApplier::LimitToAllowedRange(rtc::ArrayView<float> x) { |
| 32 for (auto& v : x) { |
| 33 v = std::max(kMinSampleValue, v); |
| 34 v = std::min(kMaxSampleValue, v); |
| 35 } |
| 36 } |
| 37 |
| 38 } // namespace webrtc |
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