1 /*
2 * Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include "common_audio/real_fourier.h"
12
13 #include <stdlib.h>
14
15 #include "common_audio/real_fourier_ooura.h"
16 #include "test/gtest.h"
17
18 namespace webrtc {
19
20 using std::complex;
21
TEST(RealFourierStaticsTest,AllocatorAlignment)22 TEST(RealFourierStaticsTest, AllocatorAlignment) {
23 {
24 RealFourier::fft_real_scoper real;
25 real = RealFourier::AllocRealBuffer(3);
26 ASSERT_TRUE(real.get() != nullptr);
27 uintptr_t ptr_value = reinterpret_cast<uintptr_t>(real.get());
28 EXPECT_EQ(0u, ptr_value % RealFourier::kFftBufferAlignment);
29 }
30 {
31 RealFourier::fft_cplx_scoper cplx;
32 cplx = RealFourier::AllocCplxBuffer(3);
33 ASSERT_TRUE(cplx.get() != nullptr);
34 uintptr_t ptr_value = reinterpret_cast<uintptr_t>(cplx.get());
35 EXPECT_EQ(0u, ptr_value % RealFourier::kFftBufferAlignment);
36 }
37 }
38
TEST(RealFourierStaticsTest,OrderComputation)39 TEST(RealFourierStaticsTest, OrderComputation) {
40 EXPECT_EQ(4, RealFourier::FftOrder(13));
41 EXPECT_EQ(5, RealFourier::FftOrder(32));
42 EXPECT_EQ(1, RealFourier::FftOrder(2));
43 EXPECT_EQ(0, RealFourier::FftOrder(1));
44 }
45
TEST(RealFourierStaticsTest,ComplexLengthComputation)46 TEST(RealFourierStaticsTest, ComplexLengthComputation) {
47 EXPECT_EQ(2U, RealFourier::ComplexLength(1));
48 EXPECT_EQ(3U, RealFourier::ComplexLength(2));
49 EXPECT_EQ(5U, RealFourier::ComplexLength(3));
50 EXPECT_EQ(9U, RealFourier::ComplexLength(4));
51 EXPECT_EQ(17U, RealFourier::ComplexLength(5));
52 EXPECT_EQ(65U, RealFourier::ComplexLength(7));
53 }
54
55 template <typename T>
56 class RealFourierTest : public ::testing::Test {
57 protected:
RealFourierTest()58 RealFourierTest()
59 : rf_(2),
60 real_buffer_(RealFourier::AllocRealBuffer(4)),
61 cplx_buffer_(RealFourier::AllocCplxBuffer(3)) {}
62
~RealFourierTest()63 ~RealFourierTest() {}
64
65 T rf_;
66 const RealFourier::fft_real_scoper real_buffer_;
67 const RealFourier::fft_cplx_scoper cplx_buffer_;
68 };
69
70 using FftTypes = ::testing::Types<RealFourierOoura>;
71 TYPED_TEST_SUITE(RealFourierTest, FftTypes);
72
TYPED_TEST(RealFourierTest,SimpleForwardTransform)73 TYPED_TEST(RealFourierTest, SimpleForwardTransform) {
74 this->real_buffer_[0] = 1.0f;
75 this->real_buffer_[1] = 2.0f;
76 this->real_buffer_[2] = 3.0f;
77 this->real_buffer_[3] = 4.0f;
78
79 this->rf_.Forward(this->real_buffer_.get(), this->cplx_buffer_.get());
80
81 EXPECT_NEAR(this->cplx_buffer_[0].real(), 10.0f, 1e-8f);
82 EXPECT_NEAR(this->cplx_buffer_[0].imag(), 0.0f, 1e-8f);
83 EXPECT_NEAR(this->cplx_buffer_[1].real(), -2.0f, 1e-8f);
84 EXPECT_NEAR(this->cplx_buffer_[1].imag(), 2.0f, 1e-8f);
85 EXPECT_NEAR(this->cplx_buffer_[2].real(), -2.0f, 1e-8f);
86 EXPECT_NEAR(this->cplx_buffer_[2].imag(), 0.0f, 1e-8f);
87 }
88
TYPED_TEST(RealFourierTest,SimpleBackwardTransform)89 TYPED_TEST(RealFourierTest, SimpleBackwardTransform) {
90 this->cplx_buffer_[0] = complex<float>(10.0f, 0.0f);
91 this->cplx_buffer_[1] = complex<float>(-2.0f, 2.0f);
92 this->cplx_buffer_[2] = complex<float>(-2.0f, 0.0f);
93
94 this->rf_.Inverse(this->cplx_buffer_.get(), this->real_buffer_.get());
95
96 EXPECT_NEAR(this->real_buffer_[0], 1.0f, 1e-8f);
97 EXPECT_NEAR(this->real_buffer_[1], 2.0f, 1e-8f);
98 EXPECT_NEAR(this->real_buffer_[2], 3.0f, 1e-8f);
99 EXPECT_NEAR(this->real_buffer_[3], 4.0f, 1e-8f);
100 }
101
102 } // namespace webrtc
103