Finalization of the first version of EchoCanceller 3

webrtc/modules/audio_processing/aec3/fft_data_unittest.cc

+/*
+ *  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_data.h"
+
+#include "webrtc/test/gtest.h"
+
+namespace webrtc {
+
+#if RTC_DCHECK_IS_ON && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
+
+// Verifies the check for null output in CopyToPackedArray.
+TEST(FftData, NonNullCopyToPackedArrayOutput) {
+  EXPECT_DEATH(FftData().CopyToPackedArray(nullptr), "");
+}
+
+// Verifies the check for null output in Spectrum.
+TEST(FftData, NonNullSpectrumOutput) {
+  EXPECT_DEATH(FftData().Spectrum(nullptr), "");
+}
+
+#endif
+
+// Verifies that the Assign method properly copies the data from the source and
+// ensures that the imaginary components for the DC and Nyquist bins are 0.
+TEST(FftData, Assign) {
+  FftData x;
+  FftData y;
+
+  x.re.fill(1.f);
+  x.im.fill(2.f);
+  y.Assign(x);
+  EXPECT_EQ(x.re, y.re);
+  EXPECT_EQ(0.f, y.im[0]);
+  EXPECT_EQ(0.f, y.im[x.im.size() - 1]);
+  for (size_t k = 1; k < x.im.size() - 1; ++k) {
+    EXPECT_EQ(x.im[k], y.im[k]);
+  }
+}
+
+// Verifies that the Clear method properly clears all the data.
+TEST(FftData, Clear) {
+  FftData x_ref;
+  FftData x;
+
+  x_ref.re.fill(0.f);
+  x_ref.im.fill(0.f);
+
+  x.re.fill(1.f);
+  x.im.fill(2.f);
+  x.Clear();
+
+  EXPECT_EQ(x_ref.re, x.re);
+  EXPECT_EQ(x_ref.im, x.im);
+}
+
+// Verifies that the spectrum is correctly computed.
+TEST(FftData, Spectrum) {
+  FftData x;
+
+  for (size_t k = 0; k < x.re.size(); ++k) {
+    x.re[k] = k + 1;
+  }
+
+  x.im[0] = x.im[x.im.size() - 1] = 0.f;
+  for (size_t k = 1; k < x.im.size() - 1; ++k) {
+    x.im[k] = 2.f * (k + 1);
+  }
+
+  std::array<float, kFftLengthBy2Plus1> spectrum;
+  x.Spectrum(&spectrum);
+
+  EXPECT_EQ(x.re[0] * x.re[0], spectrum[0]);
+  EXPECT_EQ(x.re[spectrum.size() - 1] * x.re[spectrum.size() - 1],
+            spectrum[spectrum.size() - 1]);
+  for (size_t k = 1; k < spectrum.size() - 1; ++k) {
+    EXPECT_EQ(x.re[k] * x.re[k] + x.im[k] * x.im[k], spectrum[k]);
+  }
+}
+
+// Verifies that the functionality in CopyToPackedArray works as intended.
+TEST(FftData, CopyToPackedArray) {
+  FftData x;
+  std::array<float, kFftLength> x_packed;
+
+  for (size_t k = 0; k < x.re.size(); ++k) {
+    x.re[k] = k + 1;
+  }
+
+  x.im[0] = x.im[x.im.size() - 1] = 0.f;
+  for (size_t k = 1; k < x.im.size() - 1; ++k) {
+    x.im[k] = 2.f * (k + 1);
+  }
+
+  x.CopyToPackedArray(&x_packed);
+
+  EXPECT_EQ(x.re[0], x_packed[0]);
+  EXPECT_EQ(x.re[x.re.size() - 1], x_packed[1]);
+  for (size_t k = 1; k < x_packed.size() / 2; ++k) {
+    EXPECT_EQ(x.re[k], x_packed[2 * k]);
+    EXPECT_EQ(x.im[k], x_packed[2 * k + 1]);
+  }
+}
+
+// Verifies that the functionality in CopyFromPackedArray works as intended
+// (relies on that the functionality in CopyToPackedArray has been verified in
+// the test above).
+TEST(FftData, CopyFromPackedArray) {
+  FftData x_ref;
+  FftData x;
+  std::array<float, kFftLength> x_packed;
+
+  for (size_t k = 0; k < x_ref.re.size(); ++k) {
+    x_ref.re[k] = k + 1;
+  }
+
+  x_ref.im[0] = x_ref.im[x_ref.im.size() - 1] = 0.f;
+  for (size_t k = 1; k < x_ref.im.size() - 1; ++k) {
+    x_ref.im[k] = 2.f * (k + 1);
+  }
+
+  x_ref.CopyToPackedArray(&x_packed);
+  x.CopyFromPackedArray(x_packed);
+
+  EXPECT_EQ(x_ref.re, x.re);
+  EXPECT_EQ(x_ref.im, x.im);
+}
+
+}  // namespace webrtc