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/*
* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef MODULES_AUDIO_PROCESSING_LEVEL_CONTROLLER_DOWN_SAMPLER_H_
#define MODULES_AUDIO_PROCESSING_LEVEL_CONTROLLER_DOWN_SAMPLER_H_
#include "api/array_view.h"
#include "modules/audio_processing/level_controller/biquad_filter.h"
#include "rtc_base/constructormagic.h"
namespace webrtc {
class ApmDataDumper;
class DownSampler {
public:
explicit DownSampler(ApmDataDumper* data_dumper);
void Initialize(int sample_rate_hz);
void DownSample(rtc::ArrayView<const float> in, rtc::ArrayView<float> out);
private:
ApmDataDumper* data_dumper_;
int sample_rate_hz_;
int down_sampling_factor_;
BiQuadFilter low_pass_filter_;
RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(DownSampler);
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_LEVEL_CONTROLLER_DOWN_SAMPLER_H_
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