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https://github.com/mollyim/webrtc.git
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8406c43795
Reduce noise of the nearend spectrum estimation by averaging multiple frames. Bug: webrtc:9420,chromium:853699 Change-Id: Iad7e68b1209a369e263b2d892791943e42bfbb3f Reviewed-on: https://webrtc-review.googlesource.com/83960 Reviewed-by: Jesus de Vicente Pena <devicentepena@webrtc.org> Commit-Queue: Gustaf Ullberg <gustaf@webrtc.org> Cr-Commit-Position: refs/heads/master@{#23655}
58 lines
1.6 KiB
C++
58 lines
1.6 KiB
C++
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/*
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* Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "modules/audio_processing/aec3/moving_average.h"
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#include <algorithm>
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#include <functional>
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namespace webrtc {
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namespace aec3 {
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MovingAverage::MovingAverage(size_t num_elem, size_t mem_len)
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: num_elem_(num_elem),
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mem_len_(mem_len - 1),
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scaling_(1.0f / static_cast<float>(mem_len)),
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memory_(num_elem * mem_len_, 0.f),
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mem_index_(0) {
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RTC_DCHECK(num_elem_ > 0);
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RTC_DCHECK(mem_len > 0);
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}
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MovingAverage::~MovingAverage() = default;
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void MovingAverage::Average(rtc::ArrayView<const float> input,
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rtc::ArrayView<float> output) {
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RTC_DCHECK(input.size() == num_elem_);
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RTC_DCHECK(output.size() == num_elem_);
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// Sum all contributions.
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std::copy(input.begin(), input.end(), output.begin());
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for (auto i = memory_.begin(); i < memory_.end(); i += num_elem_) {
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std::transform(i, i + num_elem_, output.begin(), output.begin(),
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std::plus<float>());
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}
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// Divide by mem_len_.
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for (float& o : output) {
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o *= scaling_;
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}
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// Update memory.
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if (mem_len_ > 0) {
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std::copy(input.begin(), input.end(),
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memory_.begin() + mem_index_ * num_elem_);
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mem_index_ = (mem_index_ + 1) % mem_len_;
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}
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}
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} // namespace aec3
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} // namespace webrtc
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