1 /* 2 * Copyright (c) 2018 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 #ifndef MODULES_AUDIO_PROCESSING_AGC2_GAIN_APPLIER_H_ 12 #define MODULES_AUDIO_PROCESSING_AGC2_GAIN_APPLIER_H_ 13 14 #include <stddef.h> 15 16 #include "modules/audio_processing/include/audio_frame_view.h" 17 18 namespace webrtc { 19 class GainApplier { 20 public: 21 GainApplier(bool hard_clip_samples, float initial_gain_factor); 22 23 void ApplyGain(AudioFrameView<float> signal); 24 void SetGainFactor(float gain_factor); GetGainFactor()25 float GetGainFactor() const { return current_gain_factor_; } 26 27 private: 28 void Initialize(size_t samples_per_channel); 29 30 // Whether to clip samples after gain is applied. If 'true', result 31 // will fit in FloatS16 range. 32 const bool hard_clip_samples_; 33 float last_gain_factor_; 34 35 // If this value is not equal to 'last_gain_factor', gain will be 36 // ramped from 'last_gain_factor_' to this value during the next 37 // 'ApplyGain'. 38 float current_gain_factor_; 39 int samples_per_channel_ = -1; 40 float inverse_samples_per_channel_ = -1.f; 41 }; 42 } // namespace webrtc 43 44 #endif // MODULES_AUDIO_PROCESSING_AGC2_GAIN_APPLIER_H_ 45