Merge branch 'master' into Sync-weave

1 files changed, 256 insertions, 0 deletions

diff --git a/third_party/aom/test/fft_test.cc b/third_party/aom/test/fft_test.cc
new file mode 100644
index 000000000..e24e451a3
--- /dev/null
+++ b/third_party/aom/test/fft_test.cc
@@ -0,0 +1,256 @@
+/*
+ * Copyright (c) 2018, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#include <math.h>
+
+#include <algorithm>
+#include <complex>
+#include <vector>
+
+#include "aom_dsp/fft_common.h"
+#include "aom_mem/aom_mem.h"
+#include "av1/common/common.h"
+#include "config/aom_dsp_rtcd.h"
+#include "test/acm_random.h"
+#include "third_party/googletest/src/googletest/include/gtest/gtest.h"
+
+namespace {
+
+typedef void (*tform_fun_t)(const float *input, float *temp, float *output);
+
+// Simple 1D FFT implementation
+template <typename InputType>
+void fft(const InputType *data, std::complex<float> *result, int n) {
+  if (n == 1) {
+    result[0] = data[0];
+    return;
+  }
+  std::vector<InputType> temp(n);
+  for (int k = 0; k < n / 2; ++k) {
+    temp[k] = data[2 * k];
+    temp[n / 2 + k] = data[2 * k + 1];
+  }
+  fft(&temp[0], result, n / 2);
+  fft(&temp[n / 2], result + n / 2, n / 2);
+  for (int k = 0; k < n / 2; ++k) {
+    std::complex<float> w = std::complex<float>((float)cos(2. * PI * k / n),
+                                                (float)-sin(2. * PI * k / n));
+    std::complex<float> a = result[k];
+    std::complex<float> b = result[n / 2 + k];
+    result[k] = a + w * b;
+    result[n / 2 + k] = a - w * b;
+  }
+}
+
+void transpose(std::vector<std::complex<float> > *data, int n) {
+  for (int y = 0; y < n; ++y) {
+    for (int x = y + 1; x < n; ++x) {
+      std::swap((*data)[y * n + x], (*data)[x * n + y]);
+    }
+  }
+}
+
+// Simple 2D FFT implementation
+template <class InputType>
+std::vector<std::complex<float> > fft2d(const InputType *input, int n) {
+  std::vector<std::complex<float> > rowfft(n * n);
+  std::vector<std::complex<float> > result(n * n);
+  for (int y = 0; y < n; ++y) {
+    fft(input + y * n, &rowfft[y * n], n);
+  }
+  transpose(&rowfft, n);
+  for (int y = 0; y < n; ++y) {
+    fft(&rowfft[y * n], &result[y * n], n);
+  }
+  transpose(&result, n);
+  return result;
+}
+
+struct FFTTestArg {
+  int n;
+  void (*fft)(const float *input, float *temp, float *output);
+  FFTTestArg(int n_in, tform_fun_t fft_in) : n(n_in), fft(fft_in) {}
+};
+
+std::ostream &operator<<(std::ostream &os, const FFTTestArg &test_arg) {
+  return os << "fft_arg { n:" << test_arg.n << " fft:" << test_arg.fft << " }";
+}
+
+class FFT2DTest : public ::testing::TestWithParam<FFTTestArg> {
+ protected:
+  void SetUp() {
+    int n = GetParam().n;
+    input_ = (float *)aom_memalign(32, sizeof(*input_) * n * n);
+    temp_ = (float *)aom_memalign(32, sizeof(*temp_) * n * n);
+    output_ = (float *)aom_memalign(32, sizeof(*output_) * n * n * 2);
+    memset(input_, 0, sizeof(*input_) * n * n);
+    memset(temp_, 0, sizeof(*temp_) * n * n);
+    memset(output_, 0, sizeof(*output_) * n * n * 2);
+  }
+  void TearDown() {
+    aom_free(input_);
+    aom_free(temp_);
+    aom_free(output_);
+  }
+  float *input_;
+  float *temp_;
+  float *output_;
+};
+
+TEST_P(FFT2DTest, Correct) {
+  int n = GetParam().n;
+  for (int i = 0; i < n * n; ++i) {
+    input_[i] = 1;
+    std::vector<std::complex<float> > expected = fft2d<float>(&input_[0], n);
+    GetParam().fft(&input_[0], &temp_[0], &output_[0]);
+    for (int y = 0; y < n; ++y) {
+      for (int x = 0; x < (n / 2) + 1; ++x) {
+        EXPECT_NEAR(expected[y * n + x].real(), output_[2 * (y * n + x)], 1e-5);
+        EXPECT_NEAR(expected[y * n + x].imag(), output_[2 * (y * n + x) + 1],
+                    1e-5);
+      }
+    }
+    input_[i] = 0;
+  }
+}
+
+TEST_P(FFT2DTest, Benchmark) {
+  int n = GetParam().n;
+  float sum = 0;
+  for (int i = 0; i < 1000 * (64 - n); ++i) {
+    input_[i % (n * n)] = 1;
+    GetParam().fft(&input_[0], &temp_[0], &output_[0]);
+    sum += output_[0];
+    input_[i % (n * n)] = 0;
+  }
+}
+
+INSTANTIATE_TEST_CASE_P(C, FFT2DTest,
+                        ::testing::Values(FFTTestArg(2, aom_fft2x2_float_c),
+                                          FFTTestArg(4, aom_fft4x4_float_c),
+                                          FFTTestArg(8, aom_fft8x8_float_c),
+                                          FFTTestArg(16, aom_fft16x16_float_c),
+                                          FFTTestArg(32,
+                                                     aom_fft32x32_float_c)));
+#if ARCH_X86 || ARCH_X86_64
+#if HAVE_SSE2
+INSTANTIATE_TEST_CASE_P(
+    SSE2, FFT2DTest,
+    ::testing::Values(FFTTestArg(4, aom_fft4x4_float_sse2),
+                      FFTTestArg(8, aom_fft8x8_float_sse2),
+                      FFTTestArg(16, aom_fft16x16_float_sse2),
+                      FFTTestArg(32, aom_fft32x32_float_sse2)));
+#endif  // HAVE_SSE2
+#if HAVE_AVX2
+INSTANTIATE_TEST_CASE_P(
+    AVX2, FFT2DTest,
+    ::testing::Values(FFTTestArg(8, aom_fft8x8_float_avx2),
+                      FFTTestArg(16, aom_fft16x16_float_avx2),
+                      FFTTestArg(32, aom_fft32x32_float_avx2)));
+#endif  // HAVE_AVX2
+#endif  // ARCH_X86 || ARCH_X86_64
+
+struct IFFTTestArg {
+  int n;
+  tform_fun_t ifft;
+  IFFTTestArg(int n_in, tform_fun_t ifft_in) : n(n_in), ifft(ifft_in) {}
+};
+
+std::ostream &operator<<(std::ostream &os, const IFFTTestArg &test_arg) {
+  return os << "ifft_arg { n:" << test_arg.n << " fft:" << test_arg.ifft
+            << " }";
+}
+
+class IFFT2DTest : public ::testing::TestWithParam<IFFTTestArg> {
+ protected:
+  void SetUp() {
+    int n = GetParam().n;
+    input_ = (float *)aom_memalign(32, sizeof(*input_) * n * n * 2);
+    temp_ = (float *)aom_memalign(32, sizeof(*temp_) * n * n * 2);
+    output_ = (float *)aom_memalign(32, sizeof(*output_) * n * n);
+    memset(input_, 0, sizeof(*input_) * n * n * 2);
+    memset(temp_, 0, sizeof(*temp_) * n * n * 2);
+    memset(output_, 0, sizeof(*output_) * n * n);
+  }
+  void TearDown() {
+    aom_free(input_);
+    aom_free(temp_);
+    aom_free(output_);
+  }
+  float *input_;
+  float *temp_;
+  float *output_;
+};
+
+TEST_P(IFFT2DTest, Correctness) {
+  int n = GetParam().n;
+  ASSERT_GE(n, 2);
+  std::vector<float> expected(n * n);
+  std::vector<float> actual(n * n);
+  // Do forward transform then invert to make sure we get back expected
+  for (int y = 0; y < n; ++y) {
+    for (int x = 0; x < n; ++x) {
+      expected[y * n + x] = 1;
+      std::vector<std::complex<float> > input_c = fft2d(&expected[0], n);
+      for (int i = 0; i < n * n; ++i) {
+        input_[2 * i + 0] = input_c[i].real();
+        input_[2 * i + 1] = input_c[i].imag();
+      }
+      GetParam().ifft(&input_[0], &temp_[0], &output_[0]);
+
+      for (int yy = 0; yy < n; ++yy) {
+        for (int xx = 0; xx < n; ++xx) {
+          EXPECT_NEAR(expected[yy * n + xx], output_[yy * n + xx] / (n * n),
+                      1e-5);
+        }
+      }
+      expected[y * n + x] = 0;
+    }
+  }
+};
+
+TEST_P(IFFT2DTest, Benchmark) {
+  int n = GetParam().n;
+  float sum = 0;
+  for (int i = 0; i < 1000 * (64 - n); ++i) {
+    input_[i % (n * n)] = 1;
+    GetParam().ifft(&input_[0], &temp_[0], &output_[0]);
+    sum += output_[0];
+    input_[i % (n * n)] = 0;
+  }
+}
+INSTANTIATE_TEST_CASE_P(
+    C, IFFT2DTest,
+    ::testing::Values(IFFTTestArg(2, aom_ifft2x2_float_c),
+                      IFFTTestArg(4, aom_ifft4x4_float_c),
+                      IFFTTestArg(8, aom_ifft8x8_float_c),
+                      IFFTTestArg(16, aom_ifft16x16_float_c),
+                      IFFTTestArg(32, aom_ifft32x32_float_c)));
+#if ARCH_X86 || ARCH_X86_64
+#if HAVE_SSE2
+INSTANTIATE_TEST_CASE_P(
+    SSE2, IFFT2DTest,
+    ::testing::Values(IFFTTestArg(4, aom_ifft4x4_float_sse2),
+                      IFFTTestArg(8, aom_ifft8x8_float_sse2),
+                      IFFTTestArg(16, aom_ifft16x16_float_sse2),
+                      IFFTTestArg(32, aom_ifft32x32_float_sse2)));
+#endif  // HAVE_SSE2
+
+#if HAVE_AVX2
+INSTANTIATE_TEST_CASE_P(
+    AVX2, IFFT2DTest,
+    ::testing::Values(IFFTTestArg(8, aom_ifft8x8_float_avx2),
+                      IFFTTestArg(16, aom_ifft16x16_float_avx2),
+                      IFFTTestArg(32, aom_ifft32x32_float_avx2)));
+#endif  // HAVE_AVX2
+#endif  // ARCH_X86 || ARCH_X86_64
+
+}  // namespace