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1 /* | 1 /* |
2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license | 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 | 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 | 6 * tree. An additional intellectual property rights grant can be found |
7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
9 */ | 9 */ |
10 | 10 |
11 #ifndef WEBRTC_BASE_NUMERICS_EXP_FILTER_H_ | 11 #ifndef WEBRTC_BASE_NUMERICS_EXP_FILTER_H_ |
12 #define WEBRTC_BASE_NUMERICS_EXP_FILTER_H_ | 12 #define WEBRTC_BASE_NUMERICS_EXP_FILTER_H_ |
13 | 13 |
14 namespace rtc { | |
15 | 14 |
16 // This class can be used, for example, for smoothing the result of bandwidth | 15 // This header is deprecated and is just left here temporarily during |
17 // estimation and packet loss estimation. | 16 // refactoring. See https://bugs.webrtc.org/7634 for more details. |
18 | 17 #include "webrtc/rtc_base/numerics/exp_filter.h" |
19 class ExpFilter { | |
20 public: | |
21 static const float kValueUndefined; | |
22 | |
23 explicit ExpFilter(float alpha, float max = kValueUndefined) : max_(max) { | |
24 Reset(alpha); | |
25 } | |
26 | |
27 // Resets the filter to its initial state, and resets filter factor base to | |
28 // the given value |alpha|. | |
29 void Reset(float alpha); | |
30 | |
31 // Applies the filter with a given exponent on the provided sample: | |
32 // y(k) = min(alpha_^ exp * y(k-1) + (1 - alpha_^ exp) * sample, max_). | |
33 float Apply(float exp, float sample); | |
34 | |
35 // Returns current filtered value. | |
36 float filtered() const { return filtered_; } | |
37 | |
38 // Changes the filter factor base to the given value |alpha|. | |
39 void UpdateBase(float alpha); | |
40 | |
41 private: | |
42 float alpha_; // Filter factor base. | |
43 float filtered_; // Current filter output. | |
44 const float max_; | |
45 }; | |
46 } // namespace rtc | |
47 | 18 |
48 #endif // WEBRTC_BASE_NUMERICS_EXP_FILTER_H_ | 19 #endif // WEBRTC_BASE_NUMERICS_EXP_FILTER_H_ |
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