Add an optional artificial nearend signal for aecdump call recreation

webrtc/modules/audio_processing/test/audio_processing_simulator.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.
  */
 
@@ skipping 147 matching lines @@
     int reverse_output_sample_rate_hz,
     int input_num_channels,
     int output_num_channels,
     int reverse_input_num_channels,
     int reverse_output_num_channels) {
   in_config_ = StreamConfig(input_sample_rate_hz, input_num_channels);
   in_buf_.reset(new ChannelBuffer<float>(
       rtc::CheckedDivExact(input_sample_rate_hz, kChunksPerSecond),
       input_num_channels));
 
+  artificial_nearend_buf_.reset(new ChannelBuffer<float>(
+      rtc::CheckedDivExact(input_sample_rate_hz, kChunksPerSecond), 1));
+
   reverse_in_config_ =
       StreamConfig(reverse_input_sample_rate_hz, reverse_input_num_channels);
   reverse_in_buf_.reset(new ChannelBuffer<float>(
       rtc::CheckedDivExact(reverse_input_sample_rate_hz, kChunksPerSecond),
       reverse_input_num_channels));
 
   out_config_ = StreamConfig(output_sample_rate_hz, output_num_channels);
   out_buf_.reset(new ChannelBuffer<float>(
       rtc::CheckedDivExact(output_sample_rate_hz, kChunksPerSecond),
       output_num_channels));
@@ skipping 204 matching lines @@
     size_t kMaxFilenameSize = AudioProcessing::kMaxFilenameSize;
     RTC_CHECK_LE(settings_.aec_dump_output_filename->size(), kMaxFilenameSize);
     RTC_CHECK_EQ(AudioProcessing::kNoError,
                  ap_->StartDebugRecording(
                      settings_.aec_dump_output_filename->c_str(), -1));
   }
 }
 
 }  // namespace test
 }  // namespace webrtc