Adding full initial version of delay estimation functionality in echo canceller 3

webrtc/modules/audio_processing/aec3/echo_path_delay_estimator.h

Index: webrtc/modules/audio_processing/aec3/echo_path_delay_estimator.h
diff --git a/webrtc/modules/audio_processing/aec3/echo_path_delay_estimator.h b/webrtc/modules/audio_processing/aec3/echo_path_delay_estimator.h
index ae8ab4318e66a52ee84dddd743caa104b4b347de..831a6f437dd1abc502552717811abb9a919f0c0e 100644
--- a/webrtc/modules/audio_processing/aec3/echo_path_delay_estimator.h
+++ b/webrtc/modules/audio_processing/aec3/echo_path_delay_estimator.h
@@ -1,3 +1,4 @@
+

[hlundin-webrtc, 2017/02/01 08:30:02]

WAT?

[peah-webrtc, 2017/02/02 14:04:47]

Done.

 /*
  *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
  *
@@ -15,19 +16,32 @@
 
 #include "webrtc/base/constructormagic.h"
 #include "webrtc/base/optional.h"
+#include "webrtc/modules/audio_processing/aec3/correlator_lag_aggregator.h"
+#include "webrtc/modules/audio_processing/aec3/correlator.h"
+#include "webrtc/modules/audio_processing/aec3/down_sampler_4khz.h"
 
 namespace webrtc {
 
 class ApmDataDumper;
 
+// Estimates the delay of the echo path.
 class EchoPathDelayEstimator {
  public:
   EchoPathDelayEstimator(ApmDataDumper* data_dumper, int sample_rate_hz);
   ~EchoPathDelayEstimator();
+
+  // Produce a delay estimate if such is avaliable.
   rtc::Optional<size_t> EstimateDelay(rtc::ArrayView<const float> render,
                                       rtc::ArrayView<const float> capture);
 
  private:
+  ApmDataDumper* const data_dumper_;
+  DownSampler4kHz render_down_sampler_;
+  DownSampler4kHz capture_down_sampler_;
+  const int down_sampling_factor_;
+  Correlator correlator_;
+  CorrelatorLagAggregator correlator_lag_aggregator_;
+
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(EchoPathDelayEstimator);
 };
 }  // namespace webrtc