2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
11 #include "webrtc/modules/audio_processing/echo_cancellation_impl.h"
17 #include "webrtc/modules/audio_processing/aec/aec_core.h"
19 #include "webrtc/modules/audio_processing/aec/include/echo_cancellation.h"
20 #include "webrtc/modules/audio_processing/audio_buffer.h"
21 #include "webrtc/system_wrappers/interface/critical_section_wrapper.h"
28 int16_t MapSetting(EchoCancellation::SuppressionLevel level) {
30 case EchoCancellation::kLowSuppression:
31 return kAecNlpConservative;
32 case EchoCancellation::kModerateSuppression:
33 return kAecNlpModerate;
34 case EchoCancellation::kHighSuppression:
35 return kAecNlpAggressive;
41 AudioProcessing::Error MapError(int err) {
43 case AEC_UNSUPPORTED_FUNCTION_ERROR:
44 return AudioProcessing::kUnsupportedFunctionError;
45 case AEC_BAD_PARAMETER_ERROR:
46 return AudioProcessing::kBadParameterError;
47 case AEC_BAD_PARAMETER_WARNING:
48 return AudioProcessing::kBadStreamParameterWarning;
50 // AEC_UNSPECIFIED_ERROR
51 // AEC_UNINITIALIZED_ERROR
52 // AEC_NULL_POINTER_ERROR
53 return AudioProcessing::kUnspecifiedError;
58 EchoCancellationImpl::EchoCancellationImpl(const AudioProcessing* apm,
59 CriticalSectionWrapper* crit)
60 : ProcessingComponent(),
63 drift_compensation_enabled_(false),
64 metrics_enabled_(false),
65 suppression_level_(kModerateSuppression),
66 device_sample_rate_hz_(48000),
67 stream_drift_samples_(0),
68 was_stream_drift_set_(false),
69 stream_has_echo_(false),
70 delay_logging_enabled_(false),
71 delay_correction_enabled_(false) {}
73 EchoCancellationImpl::~EchoCancellationImpl() {}
75 int EchoCancellationImpl::ProcessRenderAudio(const AudioBuffer* audio) {
76 if (!is_component_enabled()) {
77 return apm_->kNoError;
80 assert(audio->samples_per_split_channel() <= 160);
81 assert(audio->num_channels() == apm_->num_reverse_channels());
83 int err = apm_->kNoError;
85 // The ordering convention must be followed to pass to the correct AEC.
86 size_t handle_index = 0;
87 for (int i = 0; i < apm_->num_output_channels(); i++) {
88 for (int j = 0; j < audio->num_channels(); j++) {
89 Handle* my_handle = static_cast<Handle*>(handle(handle_index));
90 err = WebRtcAec_BufferFarend(
92 audio->low_pass_split_data(j),
93 static_cast<int16_t>(audio->samples_per_split_channel()));
95 if (err != apm_->kNoError) {
96 return GetHandleError(my_handle); // TODO(ajm): warning possible?
103 return apm_->kNoError;
106 int EchoCancellationImpl::ProcessCaptureAudio(AudioBuffer* audio) {
107 if (!is_component_enabled()) {
108 return apm_->kNoError;
111 if (!apm_->was_stream_delay_set()) {
112 return apm_->kStreamParameterNotSetError;
115 if (drift_compensation_enabled_ && !was_stream_drift_set_) {
116 return apm_->kStreamParameterNotSetError;
119 assert(audio->samples_per_split_channel() <= 160);
120 assert(audio->num_channels() == apm_->num_output_channels());
122 int err = apm_->kNoError;
124 // The ordering convention must be followed to pass to the correct AEC.
125 size_t handle_index = 0;
126 stream_has_echo_ = false;
127 for (int i = 0; i < audio->num_channels(); i++) {
128 for (int j = 0; j < apm_->num_reverse_channels(); j++) {
129 Handle* my_handle = handle(handle_index);
130 err = WebRtcAec_Process(
132 audio->low_pass_split_data(i),
133 audio->high_pass_split_data(i),
134 audio->low_pass_split_data(i),
135 audio->high_pass_split_data(i),
136 static_cast<int16_t>(audio->samples_per_split_channel()),
137 apm_->stream_delay_ms(),
138 stream_drift_samples_);
140 if (err != apm_->kNoError) {
141 err = GetHandleError(my_handle);
142 // TODO(ajm): Figure out how to return warnings properly.
143 if (err != apm_->kBadStreamParameterWarning) {
149 err = WebRtcAec_get_echo_status(my_handle, &status);
150 if (err != apm_->kNoError) {
151 return GetHandleError(my_handle);
155 stream_has_echo_ = true;
162 was_stream_drift_set_ = false;
163 return apm_->kNoError;
166 int EchoCancellationImpl::Enable(bool enable) {
167 CriticalSectionScoped crit_scoped(crit_);
168 // Ensure AEC and AECM are not both enabled.
169 if (enable && apm_->echo_control_mobile()->is_enabled()) {
170 return apm_->kBadParameterError;
173 return EnableComponent(enable);
176 bool EchoCancellationImpl::is_enabled() const {
177 return is_component_enabled();
180 int EchoCancellationImpl::set_suppression_level(SuppressionLevel level) {
181 CriticalSectionScoped crit_scoped(crit_);
182 if (MapSetting(level) == -1) {
183 return apm_->kBadParameterError;
186 suppression_level_ = level;
190 EchoCancellation::SuppressionLevel EchoCancellationImpl::suppression_level()
192 return suppression_level_;
195 int EchoCancellationImpl::enable_drift_compensation(bool enable) {
196 CriticalSectionScoped crit_scoped(crit_);
197 drift_compensation_enabled_ = enable;
201 bool EchoCancellationImpl::is_drift_compensation_enabled() const {
202 return drift_compensation_enabled_;
205 int EchoCancellationImpl::set_device_sample_rate_hz(int rate) {
206 CriticalSectionScoped crit_scoped(crit_);
207 if (rate < 8000 || rate > 96000) {
208 return apm_->kBadParameterError;
211 device_sample_rate_hz_ = rate;
215 int EchoCancellationImpl::device_sample_rate_hz() const {
216 return device_sample_rate_hz_;
219 void EchoCancellationImpl::set_stream_drift_samples(int drift) {
220 was_stream_drift_set_ = true;
221 stream_drift_samples_ = drift;
224 int EchoCancellationImpl::stream_drift_samples() const {
225 return stream_drift_samples_;
228 int EchoCancellationImpl::enable_metrics(bool enable) {
229 CriticalSectionScoped crit_scoped(crit_);
230 metrics_enabled_ = enable;
234 bool EchoCancellationImpl::are_metrics_enabled() const {
235 return metrics_enabled_;
238 // TODO(ajm): we currently just use the metrics from the first AEC. Think more
239 // aboue the best way to extend this to multi-channel.
240 int EchoCancellationImpl::GetMetrics(Metrics* metrics) {
241 CriticalSectionScoped crit_scoped(crit_);
242 if (metrics == NULL) {
243 return apm_->kNullPointerError;
246 if (!is_component_enabled() || !metrics_enabled_) {
247 return apm_->kNotEnabledError;
250 AecMetrics my_metrics;
251 memset(&my_metrics, 0, sizeof(my_metrics));
252 memset(metrics, 0, sizeof(Metrics));
254 Handle* my_handle = static_cast<Handle*>(handle(0));
255 int err = WebRtcAec_GetMetrics(my_handle, &my_metrics);
256 if (err != apm_->kNoError) {
257 return GetHandleError(my_handle);
260 metrics->residual_echo_return_loss.instant = my_metrics.rerl.instant;
261 metrics->residual_echo_return_loss.average = my_metrics.rerl.average;
262 metrics->residual_echo_return_loss.maximum = my_metrics.rerl.max;
263 metrics->residual_echo_return_loss.minimum = my_metrics.rerl.min;
265 metrics->echo_return_loss.instant = my_metrics.erl.instant;
266 metrics->echo_return_loss.average = my_metrics.erl.average;
267 metrics->echo_return_loss.maximum = my_metrics.erl.max;
268 metrics->echo_return_loss.minimum = my_metrics.erl.min;
270 metrics->echo_return_loss_enhancement.instant = my_metrics.erle.instant;
271 metrics->echo_return_loss_enhancement.average = my_metrics.erle.average;
272 metrics->echo_return_loss_enhancement.maximum = my_metrics.erle.max;
273 metrics->echo_return_loss_enhancement.minimum = my_metrics.erle.min;
275 metrics->a_nlp.instant = my_metrics.aNlp.instant;
276 metrics->a_nlp.average = my_metrics.aNlp.average;
277 metrics->a_nlp.maximum = my_metrics.aNlp.max;
278 metrics->a_nlp.minimum = my_metrics.aNlp.min;
280 return apm_->kNoError;
283 bool EchoCancellationImpl::stream_has_echo() const {
284 return stream_has_echo_;
287 int EchoCancellationImpl::enable_delay_logging(bool enable) {
288 CriticalSectionScoped crit_scoped(crit_);
289 delay_logging_enabled_ = enable;
293 bool EchoCancellationImpl::is_delay_logging_enabled() const {
294 return delay_logging_enabled_;
297 // TODO(bjornv): How should we handle the multi-channel case?
298 int EchoCancellationImpl::GetDelayMetrics(int* median, int* std) {
299 CriticalSectionScoped crit_scoped(crit_);
300 if (median == NULL) {
301 return apm_->kNullPointerError;
304 return apm_->kNullPointerError;
307 if (!is_component_enabled() || !delay_logging_enabled_) {
308 return apm_->kNotEnabledError;
311 Handle* my_handle = static_cast<Handle*>(handle(0));
312 if (WebRtcAec_GetDelayMetrics(my_handle, median, std) !=
314 return GetHandleError(my_handle);
317 return apm_->kNoError;
320 struct AecCore* EchoCancellationImpl::aec_core() const {
321 CriticalSectionScoped crit_scoped(crit_);
322 if (!is_component_enabled()) {
325 Handle* my_handle = static_cast<Handle*>(handle(0));
326 return WebRtcAec_aec_core(my_handle);
329 int EchoCancellationImpl::Initialize() {
330 int err = ProcessingComponent::Initialize();
331 if (err != apm_->kNoError || !is_component_enabled()) {
335 return apm_->kNoError;
338 void EchoCancellationImpl::SetExtraOptions(const Config& config) {
339 delay_correction_enabled_ = config.Get<DelayCorrection>().enabled;
343 void* EchoCancellationImpl::CreateHandle() const {
344 Handle* handle = NULL;
345 if (WebRtcAec_Create(&handle) != apm_->kNoError) {
348 assert(handle != NULL);
354 int EchoCancellationImpl::DestroyHandle(void* handle) const {
355 assert(handle != NULL);
356 return WebRtcAec_Free(static_cast<Handle*>(handle));
359 int EchoCancellationImpl::InitializeHandle(void* handle) const {
360 assert(handle != NULL);
361 return WebRtcAec_Init(static_cast<Handle*>(handle),
362 apm_->sample_rate_hz(),
363 device_sample_rate_hz_);
366 int EchoCancellationImpl::ConfigureHandle(void* handle) const {
367 assert(handle != NULL);
369 config.metricsMode = metrics_enabled_;
370 config.nlpMode = MapSetting(suppression_level_);
371 config.skewMode = drift_compensation_enabled_;
372 config.delay_logging = delay_logging_enabled_;
374 WebRtcAec_enable_delay_correction(WebRtcAec_aec_core(
375 static_cast<Handle*>(handle)), delay_correction_enabled_ ? 1 : 0);
376 return WebRtcAec_set_config(static_cast<Handle*>(handle), config);
379 int EchoCancellationImpl::num_handles_required() const {
380 return apm_->num_output_channels() *
381 apm_->num_reverse_channels();
384 int EchoCancellationImpl::GetHandleError(void* handle) const {
385 assert(handle != NULL);
386 return MapError(WebRtcAec_get_error_code(static_cast<Handle*>(handle)));
388 } // namespace webrtc