61 lines
1.7 KiB
C++
61 lines
1.7 KiB
C++
|
|
||
|
|
/*
|
||
|
|
* Copyright (c) 2018 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 "modules/audio_processing/aec3/moving_average.h"
|
||
|
|
|
||
|
|
#include <algorithm>
|
||
|
|
#include <functional>
|
||
|
|
|
||
|
|
#include "rtc_base/checks.h"
|
||
|
|
|
||
|
|
namespace webrtc {
|
||
|
|
namespace aec3 {
|
||
|
|
|
||
|
|
MovingAverage::MovingAverage(size_t num_elem, size_t mem_len)
|
||
|
|
: num_elem_(num_elem),
|
||
|
|
mem_len_(mem_len - 1),
|
||
|
|
scaling_(1.0f / static_cast<float>(mem_len)),
|
||
|
|
memory_(num_elem * mem_len_, 0.f),
|
||
|
|
mem_index_(0) {
|
||
|
|
RTC_DCHECK(num_elem_ > 0);
|
||
|
|
RTC_DCHECK(mem_len > 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
MovingAverage::~MovingAverage() = default;
|
||
|
|
|
||
|
|
void MovingAverage::Average(rtc::ArrayView<const float> input,
|
||
|
|
rtc::ArrayView<float> output) {
|
||
|
|
RTC_DCHECK(input.size() == num_elem_);
|
||
|
|
RTC_DCHECK(output.size() == num_elem_);
|
||
|
|
|
||
|
|
// Sum all contributions.
|
||
|
|
std::copy(input.begin(), input.end(), output.begin());
|
||
|
|
for (auto i = memory_.begin(); i < memory_.end(); i += num_elem_) {
|
||
|
|
std::transform(i, i + num_elem_, output.begin(), output.begin(),
|
||
|
|
std::plus<float>());
|
||
|
|
}
|
||
|
|
|
||
|
|
// Divide by mem_len_.
|
||
|
|
for (float& o : output) {
|
||
|
|
o *= scaling_;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Update memory.
|
||
|
|
if (mem_len_ > 0) {
|
||
|
|
std::copy(input.begin(), input.end(),
|
||
|
|
memory_.begin() + mem_index_ * num_elem_);
|
||
|
|
mem_index_ = (mem_index_ + 1) % mem_len_;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace aec3
|
||
|
|
} // namespace webrtc
|