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/*
* 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/render_delay_controller.h"
#include <stddef.h>
#include <algorithm>
#include <memory>
#include "absl/types/optional.h"
#include "api/array_view.h"
#include "api/audio/echo_canceller3_config.h"
#include "modules/audio_processing/aec3/aec3_common.h"
#include "modules/audio_processing/aec3/delay_estimate.h"
#include "modules/audio_processing/aec3/downsampled_render_buffer.h"
#include "modules/audio_processing/aec3/echo_path_delay_estimator.h"
#include "modules/audio_processing/aec3/render_delay_controller_metrics.h"
#include "modules/audio_processing/logging/apm_data_dumper.h"
#include "rtc_base/atomic_ops.h"
#include "rtc_base/checks.h"
namespace webrtc {
namespace {
class RenderDelayControllerImpl final : public RenderDelayController {
public:
RenderDelayControllerImpl(const EchoCanceller3Config& config,
int sample_rate_hz,
size_t num_capture_channels);
RenderDelayControllerImpl() = delete;
RenderDelayControllerImpl(const RenderDelayControllerImpl&) = delete;
RenderDelayControllerImpl& operator=(const RenderDelayControllerImpl&) =
delete;
~RenderDelayControllerImpl() override;
void Reset(bool reset_delay_confidence) override;
void LogRenderCall() override;
absl::optional<DelayEstimate> GetDelay(
const DownsampledRenderBuffer& render_buffer,
size_t render_delay_buffer_delay,
const std::vector<std::vector<float>>& capture) override;
bool HasClockdrift() const override;
private:
static int instance_count_;
std::unique_ptr<ApmDataDumper> data_dumper_;
const int hysteresis_limit_blocks_;
const int delay_headroom_samples_;
absl::optional<DelayEstimate> delay_;
EchoPathDelayEstimator delay_estimator_;
RenderDelayControllerMetrics metrics_;
absl::optional<DelayEstimate> delay_samples_;
size_t capture_call_counter_ = 0;
int delay_change_counter_ = 0;
DelayEstimate::Quality last_delay_estimate_quality_;
};
DelayEstimate ComputeBufferDelay(
const absl::optional<DelayEstimate>& current_delay,
int hysteresis_limit_blocks,
int delay_headroom_samples,
DelayEstimate estimated_delay) {
// Subtract delay headroom.
const int delay_with_headroom_samples = std::max(
static_cast<int>(estimated_delay.delay) - delay_headroom_samples, 0);
// Compute the buffer delay increase required to achieve the desired latency.
size_t new_delay_blocks = delay_with_headroom_samples >> kBlockSizeLog2;
// Add hysteresis.
if (current_delay) {
size_t current_delay_blocks = current_delay->delay;
if (new_delay_blocks > current_delay_blocks &&
new_delay_blocks <= current_delay_blocks + hysteresis_limit_blocks) {
new_delay_blocks = current_delay_blocks;
}
}
DelayEstimate new_delay = estimated_delay;
new_delay.delay = new_delay_blocks;
return new_delay;
}
int RenderDelayControllerImpl::instance_count_ = 0;
RenderDelayControllerImpl::RenderDelayControllerImpl(
const EchoCanceller3Config& config,
int sample_rate_hz,
size_t num_capture_channels)
: data_dumper_(
new ApmDataDumper(rtc::AtomicOps::Increment(&instance_count_))),
hysteresis_limit_blocks_(
static_cast<int>(config.delay.hysteresis_limit_blocks)),
delay_headroom_samples_(config.delay.delay_headroom_samples),
delay_estimator_(data_dumper_.get(), config, num_capture_channels),
last_delay_estimate_quality_(DelayEstimate::Quality::kCoarse) {
RTC_DCHECK(ValidFullBandRate(sample_rate_hz));
delay_estimator_.LogDelayEstimationProperties(sample_rate_hz, 0);
}
RenderDelayControllerImpl::~RenderDelayControllerImpl() = default;
void RenderDelayControllerImpl::Reset(bool reset_delay_confidence) {
delay_ = absl::nullopt;
delay_samples_ = absl::nullopt;
delay_estimator_.Reset(reset_delay_confidence);
delay_change_counter_ = 0;
if (reset_delay_confidence) {
last_delay_estimate_quality_ = DelayEstimate::Quality::kCoarse;
}
}
void RenderDelayControllerImpl::LogRenderCall() {}
absl::optional<DelayEstimate> RenderDelayControllerImpl::GetDelay(
const DownsampledRenderBuffer& render_buffer,
size_t render_delay_buffer_delay,
const std::vector<std::vector<float>>& capture) {
RTC_DCHECK_EQ(kBlockSize, capture[0].size());
++capture_call_counter_;
auto delay_samples = delay_estimator_.EstimateDelay(render_buffer, capture);
if (delay_samples) {
if (!delay_samples_ || delay_samples->delay != delay_samples_->delay) {
delay_change_counter_ = 0;
}
if (delay_samples_) {
delay_samples_->blocks_since_last_change =
delay_samples_->delay == delay_samples->delay
? delay_samples_->blocks_since_last_change + 1
: 0;
delay_samples_->blocks_since_last_update = 0;
delay_samples_->delay = delay_samples->delay;
delay_samples_->quality = delay_samples->quality;
} else {
delay_samples_ = delay_samples;
}
} else {
if (delay_samples_) {
++delay_samples_->blocks_since_last_change;
++delay_samples_->blocks_since_last_update;
}
}
if (delay_change_counter_ < 2 * kNumBlocksPerSecond) {
++delay_change_counter_;
}
if (delay_samples_) {
// Compute the render delay buffer delay.
const bool use_hysteresis =
last_delay_estimate_quality_ == DelayEstimate::Quality::kRefined &&
delay_samples_->quality == DelayEstimate::Quality::kRefined;
delay_ = ComputeBufferDelay(delay_,
use_hysteresis ? hysteresis_limit_blocks_ : 0,
delay_headroom_samples_, *delay_samples_);
last_delay_estimate_quality_ = delay_samples_->quality;
}
metrics_.Update(delay_samples_ ? absl::optional<size_t>(delay_samples_->delay)
: absl::nullopt,
delay_ ? delay_->delay : 0, 0, delay_estimator_.Clockdrift());
data_dumper_->DumpRaw("aec3_render_delay_controller_delay",
delay_samples ? delay_samples->delay : 0);
data_dumper_->DumpRaw("aec3_render_delay_controller_buffer_delay",
delay_ ? delay_->delay : 0);
return delay_;
}
bool RenderDelayControllerImpl::HasClockdrift() const {
return delay_estimator_.Clockdrift() != ClockdriftDetector::Level::kNone;
}
} // namespace
RenderDelayController* RenderDelayController::Create(
const EchoCanceller3Config& config,
int sample_rate_hz,
size_t num_capture_channels) {
return new RenderDelayControllerImpl(config, sample_rate_hz,
num_capture_channels);
}
} // namespace webrtc
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