1 /*
2  *  Copyright (c) 2012 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_HIGH_PASS_FILTER_H_
12 #define MODULES_AUDIO_PROCESSING_HIGH_PASS_FILTER_H_
13 
14 #include <memory>
15 #include <vector>
16 
17 #include "api/array_view.h"
18 #include "modules/audio_processing/utility/cascaded_biquad_filter.h"
19 
20 namespace webrtc {
21 
22 class AudioBuffer;
23 
24 class HighPassFilter {
25  public:
26   HighPassFilter(int sample_rate_hz, size_t num_channels);
27   ~HighPassFilter();
28   HighPassFilter(const HighPassFilter&) = delete;
29   HighPassFilter& operator=(const HighPassFilter&) = delete;
30 
31   void Process(AudioBuffer* audio, bool use_split_band_data);
32   void Process(std::vector<std::vector<float>>* audio);
33   void Reset();
34   void Reset(size_t num_channels);
35 
sample_rate_hz()36   int sample_rate_hz() const { return sample_rate_hz_; }
num_channels()37   size_t num_channels() const { return filters_.size(); }
38 
39  private:
40   const int sample_rate_hz_;
41   std::vector<std::unique_ptr<CascadedBiQuadFilter>> filters_;
42 };
43 }  // namespace webrtc
44 
45 #endif  // MODULES_AUDIO_PROCESSING_HIGH_PASS_FILTER_H_
46