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| 1 /* | |
| 2 * Copyright (c) 2011 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 #include "webrtc/modules/audio_conference_mixer/source/level_indicator.h" | |
| 12 | |
| 13 namespace webrtc { | |
| 14 // Array for adding smothing to level changes (ad-hoc). | |
| 15 const uint32_t perm[] = | |
| 16 {0,1,2,3,4,4,5,5,5,5,6,6,6,6,6,7,7,7,7,8,8,8,9,9,9,9,9,9,9,9,9,9,9}; | |
| 17 | |
| 18 LevelIndicator::LevelIndicator() | |
| 19 : _max(0), | |
| 20 _count(0), | |
| 21 _currentLevel(0) | |
| 22 { | |
| 23 } | |
| 24 | |
| 25 LevelIndicator::~LevelIndicator() | |
| 26 { | |
| 27 } | |
| 28 | |
| 29 // Level is based on the highest absolute value for all samples. | |
| 30 void LevelIndicator::ComputeLevel(const int16_t* speech, | |
| 31 const uint16_t nrOfSamples) | |
| 32 { | |
| 33 int32_t min = 0; | |
| 34 for(uint32_t i = 0; i < nrOfSamples; i++) | |
| 35 { | |
| 36 if(_max < speech[i]) | |
| 37 { | |
| 38 _max = speech[i]; | |
| 39 } | |
| 40 if(min > speech[i]) | |
| 41 { | |
| 42 min = speech[i]; | |
| 43 } | |
| 44 } | |
| 45 | |
| 46 // Absolute max value. | |
| 47 if(-min > _max) | |
| 48 { | |
| 49 _max = -min; | |
| 50 } | |
| 51 | |
| 52 if(_count == TICKS_BEFORE_CALCULATION) | |
| 53 { | |
| 54 // Highest sample value maps directly to a level. | |
| 55 int32_t position = _max / 1000; | |
| 56 if ((position == 0) && | |
| 57 (_max > 250)) | |
| 58 { | |
| 59 position = 1; | |
| 60 } | |
| 61 _currentLevel = perm[position]; | |
| 62 // The max value is decayed and stored so that it can be reused to slow | |
| 63 // down decreases in level. | |
| 64 _max = _max >> 1; | |
| 65 _count = 0; | |
| 66 } else { | |
| 67 _count++; | |
| 68 } | |
| 69 } | |
| 70 | |
| 71 int32_t LevelIndicator::GetLevel() | |
| 72 { | |
| 73 return _currentLevel; | |
| 74 } | |
| 75 | |
| 76 } // namespace webrtc | |
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Chromium Code Reviews
Issue 1216133004:
Removing AudioMixerStatusReceiver and ParticipantStatistics (Closed)
Base URL: https://chromium.googlesource.com/external/webrtc.git@master