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/*
* Copyright (c) 2013 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/transient/moving_moments.h"
#include <math.h>
#include <string.h>
#include "webrtc/system_wrappers/interface/scoped_ptr.h"
namespace webrtc {
MovingMoments::MovingMoments(size_t length)
: length_(length),
queue_(),
sum_(0.0),
sum_of_squares_(0.0) {
assert(length > 0);
for (size_t i = 0; i < length; ++i) {
queue_.push(0.0);
}
}
MovingMoments::~MovingMoments() {}
void MovingMoments::CalculateMoments(const float* in, size_t in_length,
float* first, float* second) {
assert(in && in_length > 0 && first && second);
for (size_t i = 0; i < in_length; ++i) {
const float old_value = queue_.front();
queue_.pop();
queue_.push(in[i]);
sum_ += in[i] - old_value;
sum_of_squares_ += in[i] * in[i] - old_value * old_value;
first[i] = sum_ / length_;
second[i] = sum_of_squares_ / length_;
}
}
} // namespace webrtc
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