5c532d3774
This CL robustifies the echo removal behavior when headsets are used. In particular it: -Introduces a secondary, more refined alignment when no alignment can be found using the delay estimator. -Changes decision logic for when to use the linear filter output. -Changes the decision logic for when to be transparent. -Changes the way that the transparent mode works. -Makes the nonlinear mode less aggressive. -Removes the detector for non-audible echoes. -Makes the attenuation when there are signals with strong narrowband characteristics more mild in scenarios with low render. Furthermore the CL: -Removes the input of external echo leakage information. Bug: webrtc:9047,chromium:824111,webrtc:8314,webrtc:8671,webrtc:5201,webrtc:5919 Change-Id: Ied1fe0c0a35d3c31b47606ed2db319a73644d406 Reviewed-on: https://webrtc-review.googlesource.com/60866 Commit-Queue: Per Åhgren <peah@webrtc.org> Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org> Cr-Commit-Position: refs/heads/master@{#22548}
93 lines
2.9 KiB
C++
93 lines
2.9 KiB
C++
/*
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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/suppression_gain_limiter.h"
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#include <math.h>
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#include <algorithm>
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#include "modules/audio_processing/aec3/aec3_common.h"
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namespace webrtc {
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namespace {
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// Computes the gain rampup factor to use.
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float ComputeGainRampupIncrease(
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const EchoCanceller3Config::EchoRemovalControl::GainRampup& rampup_config) {
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return powf(1.f / rampup_config.first_non_zero_gain,
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1.f / rampup_config.non_zero_gain_blocks);
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}
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} // namespace
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SuppressionGainUpperLimiter::SuppressionGainUpperLimiter(
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const EchoCanceller3Config& config)
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: rampup_config_(config.echo_removal_control.gain_rampup),
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gain_rampup_increase_(ComputeGainRampupIncrease(rampup_config_)) {
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Reset();
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}
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void SuppressionGainUpperLimiter::Reset() {
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recent_reset_ = true;
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}
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void SuppressionGainUpperLimiter::Update(bool render_activity,
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bool transparent_mode) {
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if (transparent_mode) {
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active_render_seen_ = true;
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call_startup_phase_ = false;
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recent_reset_ = false;
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suppressor_gain_limit_ = 1.f;
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return;
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}
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if (recent_reset_ && !call_startup_phase_) {
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// Only enforce 250 ms full suppression after in-call resets,
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constexpr int kMuteFramesAfterReset = kNumBlocksPerSecond / 4;
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realignment_counter_ = kMuteFramesAfterReset;
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} else if (!active_render_seen_ && render_activity) {
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// Enforce a tailormade suppression limiting during call startup.
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active_render_seen_ = true;
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realignment_counter_ = rampup_config_.full_gain_blocks;
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} else if (realignment_counter_ > 0) {
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if (--realignment_counter_ == 0) {
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call_startup_phase_ = false;
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}
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}
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recent_reset_ = false;
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// Do not enforce any gain limit on the suppressor.
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if (realignment_counter_ <= 0) {
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suppressor_gain_limit_ = 1.f;
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return;
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}
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// Enforce full suppression.
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if (realignment_counter_ > rampup_config_.non_zero_gain_blocks ||
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(!call_startup_phase_ && realignment_counter_ > 0)) {
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suppressor_gain_limit_ = 0.f;
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return;
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}
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// Start increasing the gain limit.
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if (realignment_counter_ == rampup_config_.non_zero_gain_blocks) {
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suppressor_gain_limit_ = rampup_config_.first_non_zero_gain;
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return;
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}
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// Increase the gain limit until it reaches 1.f.
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RTC_DCHECK_LT(0.f, suppressor_gain_limit_);
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suppressor_gain_limit_ =
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std::min(1.f, suppressor_gain_limit_ * gain_rampup_increase_);
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RTC_DCHECK_GE(1.f, suppressor_gain_limit_);
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}
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} // namespace webrtc
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