mirror of
https://github.com/danog/libtgvoip.git
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5caaaafa42
I'm now using the entire audio processing module from WebRTC as opposed to individual DSP algorithms pulled from there before. Seems to work better this way.
94 lines
2.9 KiB
C++
94 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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#include "rtc_base/checks.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 (!IsActive()) {
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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_ = rampup_config_.initial_gain;
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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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