blob: 21ba177b5d5c7a172f41d051975a43a5e9050c23 [file] [log] [blame]
/*
* Copyright (c) 2012 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/echo_cancellation_impl.h"
#include <stdint.h>
#include <string.h>
#include "modules/audio_processing/aec/aec_core.h"
#include "modules/audio_processing/aec/echo_cancellation.h"
#include "modules/audio_processing/audio_buffer.h"
#include "rtc_base/checks.h"
#include "system_wrappers/include/field_trial.h"
namespace webrtc {
namespace {
int16_t MapSetting(EchoCancellationImpl::SuppressionLevel level) {
switch (level) {
case EchoCancellationImpl::kLowSuppression:
return kAecNlpConservative;
case EchoCancellationImpl::kModerateSuppression:
return kAecNlpModerate;
case EchoCancellationImpl::kHighSuppression:
return kAecNlpAggressive;
}
RTC_NOTREACHED();
return -1;
}
AudioProcessing::Error MapError(int err) {
switch (err) {
case AEC_UNSUPPORTED_FUNCTION_ERROR:
return AudioProcessing::kUnsupportedFunctionError;
case AEC_BAD_PARAMETER_ERROR:
return AudioProcessing::kBadParameterError;
case AEC_BAD_PARAMETER_WARNING:
return AudioProcessing::kBadStreamParameterWarning;
default:
// AEC_UNSPECIFIED_ERROR
// AEC_UNINITIALIZED_ERROR
// AEC_NULL_POINTER_ERROR
return AudioProcessing::kUnspecifiedError;
}
}
bool EnforceZeroStreamDelay() {
#if defined(CHROMEOS)
return !field_trial::IsEnabled("WebRTC-Aec2ZeroStreamDelayKillSwitch");
#else
return false;
#endif
}
} // namespace
struct EchoCancellationImpl::StreamProperties {
StreamProperties() = delete;
StreamProperties(int sample_rate_hz,
size_t num_reverse_channels,
size_t num_output_channels,
size_t num_proc_channels)
: sample_rate_hz(sample_rate_hz),
num_reverse_channels(num_reverse_channels),
num_output_channels(num_output_channels),
num_proc_channels(num_proc_channels) {}
const int sample_rate_hz;
const size_t num_reverse_channels;
const size_t num_output_channels;
const size_t num_proc_channels;
};
class EchoCancellationImpl::Canceller {
public:
Canceller() {
state_ = WebRtcAec_Create();
RTC_DCHECK(state_);
}
~Canceller() {
RTC_CHECK(state_);
WebRtcAec_Free(state_);
}
void* state() { return state_; }
void Initialize(int sample_rate_hz) {
// TODO(ajm): Drift compensation is disabled in practice. If restored, it
// should be managed internally and not depend on the hardware sample rate.
// For now, just hardcode a 48 kHz value.
const int error = WebRtcAec_Init(state_, sample_rate_hz, 48000);
RTC_DCHECK_EQ(0, error);
}
private:
void* state_;
};
EchoCancellationImpl::EchoCancellationImpl()
: drift_compensation_enabled_(false),
metrics_enabled_(true),
suppression_level_(kHighSuppression),
stream_drift_samples_(0),
was_stream_drift_set_(false),
stream_has_echo_(false),
delay_logging_enabled_(true),
extended_filter_enabled_(false),
delay_agnostic_enabled_(false),
enforce_zero_stream_delay_(EnforceZeroStreamDelay()) {}
EchoCancellationImpl::~EchoCancellationImpl() = default;
void EchoCancellationImpl::ProcessRenderAudio(
rtc::ArrayView<const float> packed_render_audio) {
RTC_DCHECK(stream_properties_);
size_t handle_index = 0;
size_t buffer_index = 0;
const size_t num_frames_per_band =
packed_render_audio.size() / (stream_properties_->num_output_channels *
stream_properties_->num_reverse_channels);
for (size_t i = 0; i < stream_properties_->num_output_channels; i++) {
for (size_t j = 0; j < stream_properties_->num_reverse_channels; j++) {
WebRtcAec_BufferFarend(cancellers_[handle_index++]->state(),
&packed_render_audio[buffer_index],
num_frames_per_band);
buffer_index += num_frames_per_band;
}
}
}
int EchoCancellationImpl::ProcessCaptureAudio(AudioBuffer* audio,
int stream_delay_ms) {
const int stream_delay_ms_use =
enforce_zero_stream_delay_ ? 0 : stream_delay_ms;
if (drift_compensation_enabled_ && !was_stream_drift_set_) {
return AudioProcessing::kStreamParameterNotSetError;
}
RTC_DCHECK(stream_properties_);
RTC_DCHECK_GE(160, audio->num_frames_per_band());
RTC_DCHECK_EQ(audio->num_channels(), stream_properties_->num_proc_channels);
int err = AudioProcessing::kNoError;
// The ordering convention must be followed to pass to the correct AEC.
size_t handle_index = 0;
stream_has_echo_ = false;
for (size_t i = 0; i < audio->num_channels(); i++) {
for (size_t j = 0; j < stream_properties_->num_reverse_channels; j++) {
err = WebRtcAec_Process(cancellers_[handle_index]->state(),
audio->split_bands_const_f(i), audio->num_bands(),
audio->split_bands_f(i),
audio->num_frames_per_band(), stream_delay_ms_use,
stream_drift_samples_);
if (err != AudioProcessing::kNoError) {
err = MapError(err);
// TODO(ajm): Figure out how to return warnings properly.
if (err != AudioProcessing::kBadStreamParameterWarning) {
return err;
}
}
int status = 0;
err = WebRtcAec_get_echo_status(cancellers_[handle_index]->state(),
&status);
if (err != AudioProcessing::kNoError) {
return MapError(err);
}
if (status == 1) {
stream_has_echo_ = true;
}
handle_index++;
}
}
was_stream_drift_set_ = false;
return AudioProcessing::kNoError;
}
int EchoCancellationImpl::set_suppression_level(SuppressionLevel level) {
if (MapSetting(level) == -1) {
return AudioProcessing::kBadParameterError;
}
suppression_level_ = level;
return Configure();
}
EchoCancellationImpl::SuppressionLevel EchoCancellationImpl::suppression_level()
const {
return suppression_level_;
}
int EchoCancellationImpl::enable_drift_compensation(bool enable) {
drift_compensation_enabled_ = enable;
return Configure();
}
bool EchoCancellationImpl::is_drift_compensation_enabled() const {
return drift_compensation_enabled_;
}
void EchoCancellationImpl::set_stream_drift_samples(int drift) {
was_stream_drift_set_ = true;
stream_drift_samples_ = drift;
}
int EchoCancellationImpl::stream_drift_samples() const {
return stream_drift_samples_;
}
int EchoCancellationImpl::enable_metrics(bool enable) {
metrics_enabled_ = enable;
return Configure();
}
bool EchoCancellationImpl::are_metrics_enabled() const {
return metrics_enabled_;
}
// TODO(ajm): we currently just use the metrics from the first AEC. Think more
// aboue the best way to extend this to multi-channel.
int EchoCancellationImpl::GetMetrics(Metrics* metrics) {
if (metrics == NULL) {
return AudioProcessing::kNullPointerError;
}
if (!metrics_enabled_) {
return AudioProcessing::kNotEnabledError;
}
AecMetrics my_metrics;
memset(&my_metrics, 0, sizeof(my_metrics));
memset(metrics, 0, sizeof(Metrics));
const int err = WebRtcAec_GetMetrics(cancellers_[0]->state(), &my_metrics);
if (err != AudioProcessing::kNoError) {
return MapError(err);
}
metrics->residual_echo_return_loss.instant = my_metrics.rerl.instant;
metrics->residual_echo_return_loss.average = my_metrics.rerl.average;
metrics->residual_echo_return_loss.maximum = my_metrics.rerl.max;
metrics->residual_echo_return_loss.minimum = my_metrics.rerl.min;
metrics->echo_return_loss.instant = my_metrics.erl.instant;
metrics->echo_return_loss.average = my_metrics.erl.average;
metrics->echo_return_loss.maximum = my_metrics.erl.max;
metrics->echo_return_loss.minimum = my_metrics.erl.min;
metrics->echo_return_loss_enhancement.instant = my_metrics.erle.instant;
metrics->echo_return_loss_enhancement.average = my_metrics.erle.average;
metrics->echo_return_loss_enhancement.maximum = my_metrics.erle.max;
metrics->echo_return_loss_enhancement.minimum = my_metrics.erle.min;
metrics->a_nlp.instant = my_metrics.aNlp.instant;
metrics->a_nlp.average = my_metrics.aNlp.average;
metrics->a_nlp.maximum = my_metrics.aNlp.max;
metrics->a_nlp.minimum = my_metrics.aNlp.min;
metrics->divergent_filter_fraction = my_metrics.divergent_filter_fraction;
return AudioProcessing::kNoError;
}
bool EchoCancellationImpl::stream_has_echo() const {
return stream_has_echo_;
}
int EchoCancellationImpl::enable_delay_logging(bool enable) {
delay_logging_enabled_ = enable;
return Configure();
}
bool EchoCancellationImpl::is_delay_logging_enabled() const {
return delay_logging_enabled_;
}
bool EchoCancellationImpl::is_delay_agnostic_enabled() const {
return delay_agnostic_enabled_;
}
std::string EchoCancellationImpl::GetExperimentsDescription() {
return refined_adaptive_filter_enabled_ ? "Legacy AEC;RefinedAdaptiveFilter;"
: "Legacy AEC;";
}
bool EchoCancellationImpl::is_refined_adaptive_filter_enabled() const {
return refined_adaptive_filter_enabled_;
}
bool EchoCancellationImpl::is_extended_filter_enabled() const {
return extended_filter_enabled_;
}
// TODO(bjornv): How should we handle the multi-channel case?
int EchoCancellationImpl::GetDelayMetrics(int* median, int* std) {
float fraction_poor_delays = 0;
return GetDelayMetrics(median, std, &fraction_poor_delays);
}
int EchoCancellationImpl::GetDelayMetrics(int* median,
int* std,
float* fraction_poor_delays) {
if (median == NULL) {
return AudioProcessing::kNullPointerError;
}
if (std == NULL) {
return AudioProcessing::kNullPointerError;
}
if (!delay_logging_enabled_) {
return AudioProcessing::kNotEnabledError;
}
const int err = WebRtcAec_GetDelayMetrics(cancellers_[0]->state(), median,
std, fraction_poor_delays);
if (err != AudioProcessing::kNoError) {
return MapError(err);
}
return AudioProcessing::kNoError;
}
struct AecCore* EchoCancellationImpl::aec_core() const {
return WebRtcAec_aec_core(cancellers_[0]->state());
}
void EchoCancellationImpl::Initialize(int sample_rate_hz,
size_t num_reverse_channels,
size_t num_output_channels,
size_t num_proc_channels) {
stream_properties_.reset(
new StreamProperties(sample_rate_hz, num_reverse_channels,
num_output_channels, num_proc_channels));
const size_t num_cancellers_required =
NumCancellersRequired(stream_properties_->num_output_channels,
stream_properties_->num_reverse_channels);
if (num_cancellers_required > cancellers_.size()) {
const size_t cancellers_old_size = cancellers_.size();
cancellers_.resize(num_cancellers_required);
for (size_t i = cancellers_old_size; i < cancellers_.size(); ++i) {
cancellers_[i].reset(new Canceller());
}
}
for (auto& canceller : cancellers_) {
canceller->Initialize(sample_rate_hz);
}
Configure();
}
int EchoCancellationImpl::GetSystemDelayInSamples() const {
// Report the delay for the first AEC component.
return WebRtcAec_system_delay(WebRtcAec_aec_core(cancellers_[0]->state()));
}
void EchoCancellationImpl::PackRenderAudioBuffer(
const AudioBuffer* audio,
size_t num_output_channels,
size_t num_channels,
std::vector<float>* packed_buffer) {
RTC_DCHECK_GE(160, audio->num_frames_per_band());
RTC_DCHECK_EQ(num_channels, audio->num_channels());
packed_buffer->clear();
// The ordering convention must be followed to pass the correct data.
for (size_t i = 0; i < num_output_channels; i++) {
for (size_t j = 0; j < audio->num_channels(); j++) {
// Buffer the samples in the render queue.
packed_buffer->insert(packed_buffer->end(),
audio->split_bands_const_f(j)[kBand0To8kHz],
(audio->split_bands_const_f(j)[kBand0To8kHz] +
audio->num_frames_per_band()));
}
}
}
void EchoCancellationImpl::SetExtraOptions(bool use_extended_filter,
bool use_delay_agnostic,
bool use_refined_adaptive_filter) {
extended_filter_enabled_ = use_extended_filter;
delay_agnostic_enabled_ = use_delay_agnostic;
refined_adaptive_filter_enabled_ = use_refined_adaptive_filter;
Configure();
}
int EchoCancellationImpl::Configure() {
AecConfig config;
config.metricsMode = metrics_enabled_;
config.nlpMode = MapSetting(suppression_level_);
config.skewMode = drift_compensation_enabled_;
config.delay_logging = delay_logging_enabled_;
int error = AudioProcessing::kNoError;
for (auto& canceller : cancellers_) {
WebRtcAec_enable_extended_filter(WebRtcAec_aec_core(canceller->state()),
extended_filter_enabled_ ? 1 : 0);
WebRtcAec_enable_delay_agnostic(WebRtcAec_aec_core(canceller->state()),
delay_agnostic_enabled_ ? 1 : 0);
WebRtcAec_enable_refined_adaptive_filter(
WebRtcAec_aec_core(canceller->state()),
refined_adaptive_filter_enabled_);
const int handle_error = WebRtcAec_set_config(canceller->state(), config);
if (handle_error != AudioProcessing::kNoError) {
error = AudioProcessing::kNoError;
}
}
return error;
}
size_t EchoCancellationImpl::NumCancellersRequired(
size_t num_output_channels,
size_t num_reverse_channels) {
return num_output_channels * num_reverse_channels;
}
} // namespace webrtc