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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 |
11 #include "webrtc/modules/audio_processing/rms_level.h" | 11 #include "webrtc/modules/audio_processing/rms_level.h" |
12 | 12 |
13 #include <assert.h> | |
14 #include <math.h> | 13 #include <math.h> |
15 | 14 |
| 15 #include "webrtc/base/checks.h" |
| 16 |
16 namespace webrtc { | 17 namespace webrtc { |
17 | 18 |
18 static const float kMaxSquaredLevel = 32768 * 32768; | 19 static const float kMaxSquaredLevel = 32768 * 32768; |
19 | 20 |
20 RMSLevel::RMSLevel() | 21 RMSLevel::RMSLevel() |
21 : sum_square_(0), | 22 : sum_square_(0), |
22 sample_count_(0) {} | 23 sample_count_(0) {} |
23 | 24 |
24 RMSLevel::~RMSLevel() {} | 25 RMSLevel::~RMSLevel() {} |
25 | 26 |
(...skipping 16 matching lines...) Expand all Loading... |
42 int RMSLevel::RMS() { | 43 int RMSLevel::RMS() { |
43 if (sample_count_ == 0 || sum_square_ == 0) { | 44 if (sample_count_ == 0 || sum_square_ == 0) { |
44 Reset(); | 45 Reset(); |
45 return kMinLevel; | 46 return kMinLevel; |
46 } | 47 } |
47 | 48 |
48 // Normalize by the max level. | 49 // Normalize by the max level. |
49 float rms = sum_square_ / (sample_count_ * kMaxSquaredLevel); | 50 float rms = sum_square_ / (sample_count_ * kMaxSquaredLevel); |
50 // 20log_10(x^0.5) = 10log_10(x) | 51 // 20log_10(x^0.5) = 10log_10(x) |
51 rms = 10 * log10(rms); | 52 rms = 10 * log10(rms); |
52 assert(rms <= 0); | 53 RTC_DCHECK_LE(rms, 0); |
53 if (rms < -kMinLevel) | 54 if (rms < -kMinLevel) |
54 rms = -kMinLevel; | 55 rms = -kMinLevel; |
55 | 56 |
56 rms = -rms; | 57 rms = -rms; |
57 Reset(); | 58 Reset(); |
58 return static_cast<int>(rms + 0.5); | 59 return static_cast<int>(rms + 0.5); |
59 } | 60 } |
60 | 61 |
61 } // namespace webrtc | 62 } // namespace webrtc |
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