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/*
* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "webrtc/modules/audio_processing/agc/circular_buffer.h"
#include <assert.h>
#include <stdlib.h>
namespace webrtc {
AgcCircularBuffer::AgcCircularBuffer(int buffer_size)
: buffer_(new double[buffer_size]),
is_full_(false),
index_(0),
buffer_size_(buffer_size),
sum_(0) {}
AgcCircularBuffer::~AgcCircularBuffer() {}
void AgcCircularBuffer::Reset() {
is_full_ = false;
index_ = 0;
sum_ = 0;
}
AgcCircularBuffer* AgcCircularBuffer::Create(int buffer_size) {
if (buffer_size <= 0)
return NULL;
return new AgcCircularBuffer(buffer_size);
}
double AgcCircularBuffer::Oldest() const {
if (!is_full_)
return buffer_[0];
else
return buffer_[index_];
}
double AgcCircularBuffer::Mean() {
double m;
if (is_full_) {
m = sum_ / buffer_size_;
} else {
if (index_ > 0)
m = sum_ / index_;
else
m = 0;
}
return m;
}
void AgcCircularBuffer::Insert(double value) {
if (is_full_) {
sum_ -= buffer_[index_];
}
sum_ += value;
buffer_[index_] = value;
index_++;
if (index_ >= buffer_size_) {
is_full_ = true;
index_ = 0;
}
}
int AgcCircularBuffer::BufferLevel() {
if (is_full_)
return buffer_size_;
return index_;
}
int AgcCircularBuffer::Get(int index, double* value) const {
int err = ConvertToLinearIndex(&index);
if (err < 0)
return -1;
*value = buffer_[index];
return 0;
}
int AgcCircularBuffer::Set(int index, double value) {
int err = ConvertToLinearIndex(&index);
if (err < 0)
return -1;
sum_ -= buffer_[index];
buffer_[index] = value;
sum_ += value;
return 0;
}
int AgcCircularBuffer::ConvertToLinearIndex(int* index) const {
if (*index < 0 || *index >= buffer_size_)
return -1;
if (!is_full_ && *index >= index_)
return -1;
*index = index_ - 1 - *index;
if (*index < 0)
*index += buffer_size_;
return 0;
}
int AgcCircularBuffer::RemoveTransient(int width_threshold,
double val_threshold) {
if (!is_full_ && index_ < width_threshold + 2)
return 0;
int index_1 = 0;
int index_2 = width_threshold + 1;
double v = 0;
if (Get(index_1, &v) < 0)
return -1;
if (v < val_threshold) {
Set(index_1, 0);
int index;
for (index = index_2; index > index_1; index--) {
if (Get(index, &v) < 0)
return -1;
if (v < val_threshold)
break;
}
for (; index > index_1; index--) {
if (Set(index, 0.0) < 0)
return -1;
}
}
return 0;
}
} // namespace webrtc
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