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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/modules/audio_processing/vad/vad_circular_buffer.h" | |
| 12 | |
| 13 #include <assert.h> | |
| 14 #include <stdlib.h> | |
| 15 | |
| 16 namespace webrtc { | |
| 17 | |
| 18 VadCircularBuffer::VadCircularBuffer(int buffer_size) | |
| 19 : buffer_(new double[buffer_size]), | |
| 20 is_full_(false), | |
| 21 index_(0), | |
| 22 buffer_size_(buffer_size), | |
| 23 sum_(0) { | |
| 24 } | |
| 25 | |
| 26 VadCircularBuffer::~VadCircularBuffer() { | |
| 27 } | |
| 28 | |
| 29 void VadCircularBuffer::Reset() { | |
| 30 is_full_ = false; | |
| 31 index_ = 0; | |
| 32 sum_ = 0; | |
| 33 } | |
| 34 | |
| 35 VadCircularBuffer* VadCircularBuffer::Create(int buffer_size) { | |
| 36 if (buffer_size <= 0) | |
| 37 return NULL; | |
| 38 return new VadCircularBuffer(buffer_size); | |
| 39 } | |
| 40 | |
| 41 double VadCircularBuffer::Oldest() const { | |
| 42 if (!is_full_) | |
| 43 return buffer_[0]; | |
| 44 else | |
| 45 return buffer_[index_]; | |
| 46 } | |
| 47 | |
| 48 double VadCircularBuffer::Mean() { | |
| 49 double m; | |
| 50 if (is_full_) { | |
| 51 m = sum_ / buffer_size_; | |
| 52 } else { | |
| 53 if (index_ > 0) | |
| 54 m = sum_ / index_; | |
| 55 else | |
| 56 m = 0; | |
| 57 } | |
| 58 return m; | |
| 59 } | |
| 60 | |
| 61 void VadCircularBuffer::Insert(double value) { | |
| 62 if (is_full_) { | |
| 63 sum_ -= buffer_[index_]; | |
| 64 } | |
| 65 sum_ += value; | |
| 66 buffer_[index_] = value; | |
| 67 index_++; | |
| 68 if (index_ >= buffer_size_) { | |
| 69 is_full_ = true; | |
| 70 index_ = 0; | |
| 71 } | |
| 72 } | |
| 73 int VadCircularBuffer::BufferLevel() { | |
| 74 if (is_full_) | |
| 75 return buffer_size_; | |
| 76 return index_; | |
| 77 } | |
| 78 | |
| 79 int VadCircularBuffer::Get(int index, double* value) const { | |
| 80 int err = ConvertToLinearIndex(&index); | |
| 81 if (err < 0) | |
| 82 return -1; | |
| 83 *value = buffer_[index]; | |
| 84 return 0; | |
| 85 } | |
| 86 | |
| 87 int VadCircularBuffer::Set(int index, double value) { | |
| 88 int err = ConvertToLinearIndex(&index); | |
| 89 if (err < 0) | |
| 90 return -1; | |
| 91 | |
| 92 sum_ -= buffer_[index]; | |
| 93 buffer_[index] = value; | |
| 94 sum_ += value; | |
| 95 return 0; | |
| 96 } | |
| 97 | |
| 98 int VadCircularBuffer::ConvertToLinearIndex(int* index) const { | |
| 99 if (*index < 0 || *index >= buffer_size_) | |
| 100 return -1; | |
| 101 | |
| 102 if (!is_full_ && *index >= index_) | |
| 103 return -1; | |
| 104 | |
| 105 *index = index_ - 1 - *index; | |
| 106 if (*index < 0) | |
| 107 *index += buffer_size_; | |
| 108 return 0; | |
| 109 } | |
| 110 | |
| 111 int VadCircularBuffer::RemoveTransient(int width_threshold, | |
| 112 double val_threshold) { | |
| 113 if (!is_full_ && index_ < width_threshold + 2) | |
| 114 return 0; | |
| 115 | |
| 116 int index_1 = 0; | |
| 117 int index_2 = width_threshold + 1; | |
| 118 double v = 0; | |
| 119 if (Get(index_1, &v) < 0) | |
| 120 return -1; | |
| 121 if (v < val_threshold) { | |
| 122 Set(index_1, 0); | |
| 123 int index; | |
| 124 for (index = index_2; index > index_1; index--) { | |
| 125 if (Get(index, &v) < 0) | |
| 126 return -1; | |
| 127 if (v < val_threshold) | |
| 128 break; | |
| 129 } | |
| 130 for (; index > index_1; index--) { | |
| 131 if (Set(index, 0.0) < 0) | |
| 132 return -1; | |
| 133 } | |
| 134 } | |
| 135 return 0; | |
| 136 } | |
| 137 | |
| 138 } // namespace webrtc | |
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Chromium Code Reviews
Issue 1208793002:
Revert "Pull the Voice Activity Detector out from the AGC" (Closed)
Base URL: https://chromium.googlesource.com/external/webrtc.git@master