c20978e581
NOPRESUBMIT=True # cpplint errors that aren't caused by this CL. NOTRY=True NOTREECHECKS=True TBR=kwiberg@webrtc.org, kjellander@webrtc.org Bug: webrtc:7634 Change-Id: I3cca0fbaa807b563c95979cccd6d1bec32055f36 Reviewed-on: https://chromium-review.googlesource.com/562156 Commit-Queue: Edward Lemur <ehmaldonado@webrtc.org> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Cr-Commit-Position: refs/heads/master@{#18919}
60 lines
1.8 KiB
C++
60 lines
1.8 KiB
C++
/*
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* Copyright (c) 2017 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 "webrtc/modules/audio_processing/aec3/output_selector.h"
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#include <algorithm>
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#include <numeric>
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#include "webrtc/rtc_base/checks.h"
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namespace webrtc {
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namespace {
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// Performs the transition between the signals in a smooth manner.
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void SmoothFrameTransition(bool from_y_to_e,
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rtc::ArrayView<const float> e,
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rtc::ArrayView<float> y) {
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RTC_DCHECK_LT(0u, e.size());
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RTC_DCHECK_EQ(y.size(), e.size());
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const float change_factor = (from_y_to_e ? 1.f : -1.f) / e.size();
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float averaging = from_y_to_e ? 0.f : 1.f;
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for (size_t k = 0; k < e.size(); ++k) {
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y[k] += averaging * (e[k] - y[k]);
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averaging += change_factor;
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}
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RTC_DCHECK_EQ(from_y_to_e ? 1.f : 0.f, averaging);
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}
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} // namespace
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OutputSelector::OutputSelector() = default;
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OutputSelector::~OutputSelector() = default;
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void OutputSelector::FormLinearOutput(
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bool use_subtractor_output,
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rtc::ArrayView<const float> subtractor_output,
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rtc::ArrayView<float> capture) {
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RTC_DCHECK_EQ(subtractor_output.size(), capture.size());
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rtc::ArrayView<const float>& e_main = subtractor_output;
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rtc::ArrayView<float> y = capture;
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if (use_subtractor_output != use_subtractor_output_) {
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use_subtractor_output_ = use_subtractor_output;
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SmoothFrameTransition(use_subtractor_output_, e_main, y);
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} else if (use_subtractor_output_) {
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std::copy(e_main.begin(), e_main.end(), y.begin());
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}
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}
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} // namespace webrtc
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