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| 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_DOWN_SAMPLER_H_ |
| 12 #define WEBRTC_MODULES_AUDIO_PROCESSING_LEVEL_CONTROLLER_DOWN_SAMPLER_H_ |
| 13 |
| 14 #include "webrtc/base/array_view.h" |
| 15 #include "webrtc/base/constructormagic.h" |
| 16 #include "webrtc/modules/audio_processing/level_controller/biquad_filter.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 // WEBRTC_MODULES_AUDIO_PROCESSING_LEVEL_CONTROLLER_DOWN_SAMPLER_H_ |
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