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| 1 /* | |
| 2 * Copyright (c) 2012 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/common_audio/signal_processing/include/signal_processing_librar
y.h" | |
| 12 #include "webrtc/modules/include/module_common_types.h" | |
| 13 #include "webrtc/voice_engine/level_indicator.h" | |
| 14 | |
| 15 namespace webrtc { | |
| 16 | |
| 17 namespace voe { | |
| 18 | |
| 19 // Number of bars on the indicator. | |
| 20 // Note that the number of elements is specified because we are indexing it | |
| 21 // in the range of 0-32 | |
| 22 const int8_t permutation[33] = | |
| 23 {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}; | |
| 24 | |
| 25 | |
| 26 AudioLevel::AudioLevel() : | |
| 27 _absMax(0), | |
| 28 _count(0), | |
| 29 _currentLevel(0), | |
| 30 _currentLevelFullRange(0) { | |
| 31 WebRtcSpl_Init(); | |
| 32 } | |
| 33 | |
| 34 AudioLevel::~AudioLevel() { | |
| 35 } | |
| 36 | |
| 37 void AudioLevel::Clear() | |
| 38 { | |
| 39 rtc::CritScope cs(&_critSect); | |
| 40 _absMax = 0; | |
| 41 _count = 0; | |
| 42 _currentLevel = 0; | |
| 43 _currentLevelFullRange = 0; | |
| 44 } | |
| 45 | |
| 46 void AudioLevel::ComputeLevel(const AudioFrame& audioFrame) | |
| 47 { | |
| 48 int16_t absValue(0); | |
| 49 | |
| 50 // Check speech level (works for 2 channels as well) | |
| 51 absValue = WebRtcSpl_MaxAbsValueW16( | |
| 52 audioFrame.data_, | |
| 53 audioFrame.samples_per_channel_*audioFrame.num_channels_); | |
| 54 | |
| 55 // Protect member access using a lock since this method is called on a | |
| 56 // dedicated audio thread in the RecordedDataIsAvailable() callback. | |
| 57 rtc::CritScope cs(&_critSect); | |
| 58 | |
| 59 if (absValue > _absMax) | |
| 60 _absMax = absValue; | |
| 61 | |
| 62 // Update level approximately 10 times per second | |
| 63 if (_count++ == kUpdateFrequency) | |
| 64 { | |
| 65 _currentLevelFullRange = _absMax; | |
| 66 | |
| 67 _count = 0; | |
| 68 | |
| 69 // Highest value for a int16_t is 0x7fff = 32767 | |
| 70 // Divide with 1000 to get in the range of 0-32 which is the range of | |
| 71 // the permutation vector | |
| 72 int32_t position = _absMax/1000; | |
| 73 | |
| 74 // Make it less likely that the bar stays at position 0. I.e. only if | |
| 75 // its in the range 0-250 (instead of 0-1000) | |
| 76 if ((position == 0) && (_absMax > 250)) | |
| 77 { | |
| 78 position = 1; | |
| 79 } | |
| 80 _currentLevel = permutation[position]; | |
| 81 | |
| 82 // Decay the absolute maximum (divide by 4) | |
| 83 _absMax >>= 2; | |
| 84 } | |
| 85 } | |
| 86 | |
| 87 int8_t AudioLevel::Level() const | |
| 88 { | |
| 89 rtc::CritScope cs(&_critSect); | |
| 90 return _currentLevel; | |
| 91 } | |
| 92 | |
| 93 int16_t AudioLevel::LevelFullRange() const | |
| 94 { | |
| 95 rtc::CritScope cs(&_critSect); | |
| 96 return _currentLevelFullRange; | |
| 97 } | |
| 98 | |
| 99 } // namespace voe | |
| 100 | |
| 101 } // namespace webrtc | |
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Chromium Code Reviews
Issue 2731993002:
Update formatting of AudioLevel class (Closed)
