Adding second layer of the echo canceller 3 functionality.

webrtc/modules/audio_processing/aec3/echo_path_delay_estimator_unittest.cc

Index: webrtc/modules/audio_processing/aec3/echo_path_delay_estimator_unittest.cc
diff --git a/webrtc/modules/audio_processing/aec3/echo_path_delay_estimator_unittest.cc b/webrtc/modules/audio_processing/aec3/echo_path_delay_estimator_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..3950192e3627eef74b6e62aef2c2b63e13f2e480
--- /dev/null
+++ b/webrtc/modules/audio_processing/aec3/echo_path_delay_estimator_unittest.cc
@@ -0,0 +1,87 @@
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.

[hlundin-webrtc, 2017/01/18 13:08:49]

2017

[peah-webrtc, 2017/01/19 15:33:05]

Done.

+ *
+ *  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_path_delay_estimator.h"
+
+#include <sstream>
+#include <string>
+
+#include "webrtc/modules/audio_processing/aec3/aec3_constants.h"
+#include "webrtc/modules/audio_processing/logging/apm_data_dumper.h"
+#include "webrtc/test/gtest.h"
+
+namespace webrtc {
+namespace {
+
+std::string ProduceDebugText(int sample_rate_hz) {
+  std::ostringstream ss;
+  ss << "Sample rate: " << sample_rate_hz;
+  return ss.str();
+}
+
+}  // namespace
+
+// Verifies that the basic API calls work.
+TEST(EchoPathDelayEstimator, BasicApiCalls) {
+  for (auto rate : {8000, 16000, 32000, 48000}) {
+    ProduceDebugText(rate);
+    ApmDataDumper data_dumper(0);
+    EchoPathDelayEstimator estimator(&data_dumper, rate);
+    std::vector<float> render(std::vector<float>(kBlockSize, 0.f));
+    std::vector<float> capture(std::vector<float>(kBlockSize, 0.f));
+    for (size_t k = 0; k < 100; ++k) {
+      estimator.EstimateDelay(render, capture);
+    }
+  }
+}
+
+#if RTC_DCHECK_IS_ON && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
+
+// Verifies the check for correct sample rate.
+TEST(EchoPathDelayEstimator, WrongSampleRate) {
+  ApmDataDumper data_dumper(0);
+  EXPECT_DEATH(EchoPathDelayEstimator remover(&data_dumper, 8001), "");
+}
+
+// Verifies the check for the render blocksize.
+TEST(EchoPathDelayEstimator, WrongRenderBlockSize) {
+  for (auto rate : {8000, 16000, 32000, 48000}) {
+    ProduceDebugText(rate);
+    ApmDataDumper data_dumper(0);
+    EchoPathDelayEstimator estimator(&data_dumper, rate);
+    std::vector<float> render(std::vector<float>(kBlockSize - 1, 0.f));
+    std::vector<float> capture(std::vector<float>(kBlockSize, 0.f));
+    EXPECT_DEATH(estimator.EstimateDelay(render, capture), "");
+  }
+}
+
+// Verifies the check for the capture blocksize.
+TEST(EchoPathDelayEstimator, WrongCaptureBlockSize) {
+  for (auto rate : {8000, 16000, 32000, 48000}) {
+    ProduceDebugText(rate);
+    ApmDataDumper data_dumper(0);
+    EchoPathDelayEstimator estimator(&data_dumper, rate);
+    std::vector<float> render(std::vector<float>(kBlockSize - 1, 0.f));

[hlundin-webrtc, 2017/01/18 13:08:49]

Copy-paste error; modifying the render block size in this test too.

[peah-webrtc, 2017/01/19 15:33:05]

Great find!

Done.

+    std::vector<float> capture(std::vector<float>(kBlockSize, 0.f));
+    EXPECT_DEATH(estimator.EstimateDelay(render, capture), "");
+  }
+}
+
+// Verifies the check for non-null data dumper.
+TEST(EchoPathDelayEstimator, NullDataDumper) {
+  for (auto rate : {16000, 32000, 48000}) {

[hlundin-webrtc, 2017/01/18 13:08:49]

No need to do this for more than one sample rate.

[peah-webrtc, 2017/01/19 15:33:05]

Done.

+    ProduceDebugText(rate);
+    EXPECT_DEATH(EchoPathDelayEstimator(nullptr, rate), "");
+  }
+}
+
+#endif
+
+}  // namespace webrtc