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1 /* | 1 /* |
2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2012 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 |
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34 // 0: in success. | 34 // 0: in success. |
35 // In case of error the content of |activity| is unchanged. | 35 // In case of error the content of |activity| is unchanged. |
36 // | 36 // |
37 // Note that due to a high false-positive (VAD decision is active while the | 37 // Note that due to a high false-positive (VAD decision is active while the |
38 // processed audio is just background noise) rate, stand-alone VAD is used as | 38 // processed audio is just background noise) rate, stand-alone VAD is used as |
39 // a one-sided indicator. The activity probability is 0.5 if the frame is | 39 // a one-sided indicator. The activity probability is 0.5 if the frame is |
40 // classified as active, and the probability is 0.01 if the audio is | 40 // classified as active, and the probability is 0.01 if the audio is |
41 // classified as passive. In this way, when probabilities are combined, the | 41 // classified as passive. In this way, when probabilities are combined, the |
42 // effect of the stand-alone VAD is neutral if the input is classified as | 42 // effect of the stand-alone VAD is neutral if the input is classified as |
43 // active. | 43 // active. |
44 int GetActivity(double* p, int length_p); | 44 int GetActivity(double* p, size_t length_p); |
45 | 45 |
46 // Expecting 10 ms of 16 kHz audio to be pushed in. | 46 // Expecting 10 ms of 16 kHz audio to be pushed in. |
47 int AddAudio(const int16_t* data, int length); | 47 int AddAudio(const int16_t* data, size_t length); |
48 | 48 |
49 // Set aggressiveness of VAD, 0 is the least aggressive and 3 is the most | 49 // Set aggressiveness of VAD, 0 is the least aggressive and 3 is the most |
50 // aggressive mode. Returns -1 if the input is less than 0 or larger than 3, | 50 // aggressive mode. Returns -1 if the input is less than 0 or larger than 3, |
51 // otherwise 0 is returned. | 51 // otherwise 0 is returned. |
52 int set_mode(int mode); | 52 int set_mode(int mode); |
53 // Get the agressiveness of the current VAD. | 53 // Get the agressiveness of the current VAD. |
54 int mode() const { return mode_; } | 54 int mode() const { return mode_; } |
55 | 55 |
56 private: | 56 private: |
57 explicit StandaloneVad(VadInst* vad); | 57 explicit StandaloneVad(VadInst* vad); |
58 | 58 |
59 static const int kMaxNum10msFrames = 3; | 59 static const size_t kMaxNum10msFrames = 3; |
60 | 60 |
61 // TODO(turajs): Is there a way to use scoped-pointer here? | 61 // TODO(turajs): Is there a way to use scoped-pointer here? |
62 VadInst* vad_; | 62 VadInst* vad_; |
63 int16_t buffer_[kMaxNum10msFrames * kLength10Ms]; | 63 int16_t buffer_[kMaxNum10msFrames * kLength10Ms]; |
64 int index_; | 64 size_t index_; |
65 int mode_; | 65 int mode_; |
66 }; | 66 }; |
67 | 67 |
68 } // namespace webrtc | 68 } // namespace webrtc |
69 | 69 |
70 #endif // WEBRTC_MODULES_AUDIO_PROCESSING_AGC_STANDALONE_VAD_H_ | 70 #endif // WEBRTC_MODULES_AUDIO_PROCESSING_AGC_STANDALONE_VAD_H_ |
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