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

webrtc/modules/audio_processing/aec3/echo_canceller3.cc

 /*
  *  Copyright (c) 2016 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 "webrtc/modules/audio_processing/aec3/echo_canceller3.h"
@@ skipping 209 matching lines @@
           kRenderTransferQueueSize,
           std::vector<std::vector<float>>(
               num_bands_,
               std::vector<float>(frame_length_, 0.f)),
           Aec3RenderQueueItemVerifier(num_bands_, frame_length_)),
       block_processor_(std::move(block_processor)),
       render_queue_output_frame_(num_bands_,
                                  std::vector<float>(frame_length_, 0.f)),
       block_(num_bands_, std::vector<float>(kBlockSize, 0.f)),
       sub_frame_view_(num_bands_) {
+  RTC_DCHECK(ValidFullBandRate(sample_rate_hz_));
+
   std::unique_ptr<CascadedBiQuadFilter> render_highpass_filter;
   if (use_highpass_filter) {
     render_highpass_filter.reset(new CascadedBiQuadFilter(
         sample_rate_hz_ == 8000 ? kHighPassFilterCoefficients_8kHz
                                 : kHighPassFilterCoefficients_16kHz,
         sample_rate_hz_ == 8000 ? kNumberOfHighPassBiQuads_8kHz
                                 : kNumberOfHighPassBiQuads_16kHz));
     capture_highpass_filter_.reset(new CascadedBiQuadFilter(
         sample_rate_hz_ == 8000 ? kHighPassFilterCoefficients_8kHz
                                 : kHighPassFilterCoefficients_16kHz,
@@ skipping 113 matching lines @@
                                           block_processor_.get(), &block_) &&
         successful_buffering;
 
     frame_to_buffer =
         render_transfer_queue_.Remove(&render_queue_output_frame_);
   }
   return successful_buffering;
 }
 
 }  // namespace webrtc