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1 /* | 1 /* |
2 * Copyright (c) 2014 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2014 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 |
(...skipping 10 matching lines...) Expand all Loading... |
21 : sum_square_(0), | 21 : sum_square_(0), |
22 sample_count_(0) {} | 22 sample_count_(0) {} |
23 | 23 |
24 RMSLevel::~RMSLevel() {} | 24 RMSLevel::~RMSLevel() {} |
25 | 25 |
26 void RMSLevel::Reset() { | 26 void RMSLevel::Reset() { |
27 sum_square_ = 0; | 27 sum_square_ = 0; |
28 sample_count_ = 0; | 28 sample_count_ = 0; |
29 } | 29 } |
30 | 30 |
31 void RMSLevel::Process(const int16_t* data, int length) { | 31 void RMSLevel::Process(const int16_t* data, size_t length) { |
32 for (int i = 0; i < length; ++i) { | 32 for (size_t i = 0; i < length; ++i) { |
33 sum_square_ += data[i] * data[i]; | 33 sum_square_ += data[i] * data[i]; |
34 } | 34 } |
35 sample_count_ += length; | 35 sample_count_ += length; |
36 } | 36 } |
37 | 37 |
38 void RMSLevel::ProcessMuted(int length) { | 38 void RMSLevel::ProcessMuted(size_t length) { |
39 sample_count_ += length; | 39 sample_count_ += length; |
40 } | 40 } |
41 | 41 |
42 int RMSLevel::RMS() { | 42 int RMSLevel::RMS() { |
43 if (sample_count_ == 0 || sum_square_ == 0) { | 43 if (sample_count_ == 0 || sum_square_ == 0) { |
44 Reset(); | 44 Reset(); |
45 return kMinLevel; | 45 return kMinLevel; |
46 } | 46 } |
47 | 47 |
48 // Normalize by the max level. | 48 // Normalize by the max level. |
49 float rms = sum_square_ / (sample_count_ * kMaxSquaredLevel); | 49 float rms = sum_square_ / (sample_count_ * kMaxSquaredLevel); |
50 // 20log_10(x^0.5) = 10log_10(x) | 50 // 20log_10(x^0.5) = 10log_10(x) |
51 rms = 10 * log10(rms); | 51 rms = 10 * log10(rms); |
52 assert(rms <= 0); | 52 assert(rms <= 0); |
53 if (rms < -kMinLevel) | 53 if (rms < -kMinLevel) |
54 rms = -kMinLevel; | 54 rms = -kMinLevel; |
55 | 55 |
56 rms = -rms; | 56 rms = -rms; |
57 Reset(); | 57 Reset(); |
58 return static_cast<int>(rms + 0.5); | 58 return static_cast<int>(rms + 0.5); |
59 } | 59 } |
60 | 60 |
61 } // namespace webrtc | 61 } // namespace webrtc |
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