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 MODULES_AUDIO_PROCESSING_AGC2_DOWN_SAMPLER_H_ 12 #define MODULES_AUDIO_PROCESSING_AGC2_DOWN_SAMPLER_H_ 13 14 #include "api/array_view.h" 15 #include "modules/audio_processing/agc2/biquad_filter.h" 16 #include "rtc_base/constructor_magic.h" 17 18 namespace webrtc { 19 20 class ApmDataDumper; 21 22 class DownSampler { 23 public: 24 explicit DownSampler(ApmDataDumper* data_dumper); 25 void Initialize(int sample_rate_hz); 26 27 void DownSample(rtc::ArrayView<const float> in, rtc::ArrayView<float> out); 28 29 private: 30 ApmDataDumper* data_dumper_; 31 int sample_rate_hz_; 32 int down_sampling_factor_; 33 BiQuadFilter low_pass_filter_; 34 35 RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(DownSampler); 36 }; 37 38 } // namespace webrtc 39 40 #endif // MODULES_AUDIO_PROCESSING_AGC2_DOWN_SAMPLER_H_ 41