1 /* 2 * Copyright (c) 2017 The WebRTC project authors. All Rights Reserved. 3 * 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. 9 */ 10 11 #ifndef MODULES_AUDIO_PROCESSING_AEC3_ECHO_PATH_DELAY_ESTIMATOR_H_ 12 #define MODULES_AUDIO_PROCESSING_AEC3_ECHO_PATH_DELAY_ESTIMATOR_H_ 13 14 #include <vector> 15 16 #include "api/optional.h" 17 #include "modules/audio_processing/aec3/decimator.h" 18 #include "modules/audio_processing/aec3/downsampled_render_buffer.h" 19 #include "modules/audio_processing/aec3/matched_filter.h" 20 #include "modules/audio_processing/aec3/matched_filter_lag_aggregator.h" 21 #include "modules/audio_processing/include/audio_processing.h" 22 #include "rtc_base/constructormagic.h" 23 24 namespace webrtc { 25 26 class ApmDataDumper; 27 28 // Estimates the delay of the echo path. 29 class EchoPathDelayEstimator { 30 public: 31 EchoPathDelayEstimator(ApmDataDumper* data_dumper, 32 const EchoCanceller3Config& config); 33 ~EchoPathDelayEstimator(); 34 35 // Resets the estimation. 36 void Reset(); 37 38 // Produce a delay estimate if such is avaliable. 39 rtc::Optional<size_t> EstimateDelay( 40 const DownsampledRenderBuffer& render_buffer, 41 rtc::ArrayView<const float> capture); 42 43 // Log delay estimator properties. LogDelayEstimationProperties(int sample_rate_hz,size_t shift)44 void LogDelayEstimationProperties(int sample_rate_hz, size_t shift) const { 45 matched_filter_.LogFilterProperties(sample_rate_hz, shift, 46 down_sampling_factor_); 47 } 48 49 private: 50 ApmDataDumper* const data_dumper_; 51 const size_t down_sampling_factor_; 52 const size_t sub_block_size_; 53 Decimator capture_decimator_; 54 MatchedFilter matched_filter_; 55 MatchedFilterLagAggregator matched_filter_lag_aggregator_; 56 57 RTC_DISALLOW_COPY_AND_ASSIGN(EchoPathDelayEstimator); 58 }; 59 } // namespace webrtc 60 61 #endif // MODULES_AUDIO_PROCESSING_AEC3_ECHO_PATH_DELAY_ESTIMATOR_H_ 62