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 #ifndef WEBRTC_MODULES_AUDIO_PROCESSING_LEVEL_CONTROLLER_GAIN_APPLIER_H_ 12 #define WEBRTC_MODULES_AUDIO_PROCESSING_LEVEL_CONTROLLER_GAIN_APPLIER_H_ 13 14 #include "webrtc/base/constructormagic.h" 15 16 namespace webrtc { 17 18 class ApmDataDumper; 19 class AudioBuffer; 20 21 class GainApplier { 22 public: 23 explicit GainApplier(ApmDataDumper* data_dumper); 24 void Initialize(int sample_rate_hz); 25 26 // Applies the specified gain to the audio frame and returns the resulting 27 // number of saturated sample values. 28 int Process(float new_gain, AudioBuffer* audio); 29 30 private: 31 ApmDataDumper* const data_dumper_; 32 float old_gain_ = 1.f; 33 float gain_increase_step_size_ = 0.f; 34 float gain_normal_decrease_step_size_ = 0.f; 35 float gain_saturated_decrease_step_size_ = 0.f; 36 bool last_frame_was_saturated_; 37 RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(GainApplier); 38 }; 39 40 } // namespace webrtc 41 42 #endif // WEBRTC_MODULES_AUDIO_PROCESSING_LEVEL_CONTROLLER_GAIN_APPLIER_H_ 43