Finalization of the first version of EchoCanceller 3

webrtc/modules/audio_processing/aec3/fft_buffer_unittest.cc

Index: webrtc/modules/audio_processing/aec3/fft_buffer_unittest.cc
diff --git a/webrtc/modules/audio_processing/aec3/fft_buffer_unittest.cc b/webrtc/modules/audio_processing/aec3/fft_buffer_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d4854bd849743bd38ec78e405c9b77b100e04def
--- /dev/null
+++ b/webrtc/modules/audio_processing/aec3/fft_buffer_unittest.cc
@@ -0,0 +1,76 @@
+/*
+ *  Copyright (c) 2017 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/fft_buffer.h"
+
+#include <algorithm>
+#include <functional>
+#include <vector>
+
+#include "webrtc/test/gtest.h"
+
+namespace webrtc {
+namespace {}  // namespace
+
+#if RTC_DCHECK_IS_ON && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
+
+// Verifies that the check for that the provided numbers of Ffts to include in
+// the spectral sum is equal to the one supported works.
+TEST(FftBuffer, TooLargeNumberOfSpectralSums) {
+  EXPECT_DEATH(FftBuffer(Aec3Optimization::kNone, 1, std::vector<size_t>(2, 1)),

[aleloi, 2017/02/23 15:16:01]

This
FftBuffer(Aec3Optimization::kNone, 1, {1, 1})

saves reading/thinking time :)

+               "");
+}
+
+TEST(FftBuffer, TooSmallNumberOfSpectralSums) {
+  EXPECT_DEATH(FftBuffer(Aec3Optimization::kNone, 1, std::vector<size_t>()),

[aleloi, 2017/02/23 15:16:01]

Same here.

+               "");
+}
+
+// Verifies that the check for that the provided number of Ffts to to include in
+// the spectral is feasible works.
+TEST(FftBuffer, FeasibleNumberOfFftsInSum) {

[aleloi, 2017/02/23 15:16:01]

Perhaps 
Feasible -> InFeasible
?
Otherwise naming inconsistent with the two test names above.

+  EXPECT_DEATH(FftBuffer(Aec3Optimization::kNone, 1, std::vector<size_t>(1, 2)),

[aleloi, 2017/02/23 15:16:01]

And here.

+               "");
+}
+
+#endif
+
+// Verify the basic usage of the FftBuffer.
+TEST(FftBuffer, NormalUsage) {
+  constexpr int kBufferSize = 10;
+  FftBuffer buffer(Aec3Optimization::kNone, kBufferSize,
+                   std::vector<size_t>(1, kBufferSize));

[aleloi, 2017/02/23 15:16:01]

vector<...>(...) --> {kBufferSize}

+  FftData X;
+  std::vector<std::array<float, kFftLengthBy2Plus1>> buffer_ref(kBufferSize);
+
+  for (int k = 0; k < 30; ++k) {
+    std::array<float, kFftLengthBy2Plus1> X2_sum_ref;
+    X2_sum_ref.fill(0.f);
+    for (size_t j = 0; j < buffer.Buffer().size(); ++j) {
+      const std::array<float, kFftLengthBy2Plus1>& X2 = buffer.Spectrum(j);
+      const std::array<float, kFftLengthBy2Plus1>& X2_ref = buffer_ref[j];
+      EXPECT_EQ(X2_ref, X2);
+
+      std::transform(X2_ref.begin(), X2_ref.end(), X2_sum_ref.begin(),
+                     X2_sum_ref.begin(), std::plus<float>());
+    }
+    EXPECT_EQ(X2_sum_ref, buffer.SpectralSum(kBufferSize));
+
+    std::array<float, kFftLengthBy2Plus1> X2;
+    X.re.fill(k);
+    X.im.fill(k);
+    X.Spectrum(Aec3Optimization::kNone, &X2);
+    buffer.Insert(X);
+    buffer_ref.pop_back();
+    buffer_ref.insert(buffer_ref.begin(), X2);
+  }
+}
+
+}  // namespace webrtc