2 * Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
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.
11 #include "webrtc/common_audio/real_fourier.h"
15 #include "testing/gtest/include/gtest/gtest.h"
21 TEST(RealFourierStaticsTest, AllocatorAlignment) {
23 RealFourier::fft_real_scoper real;
24 real = RealFourier::AllocRealBuffer(3);
25 ASSERT_TRUE(real.get() != nullptr);
26 int64_t ptr_value = reinterpret_cast<int64_t>(real.get());
27 ASSERT_EQ(ptr_value % RealFourier::kFftBufferAlignment, 0);
30 RealFourier::fft_cplx_scoper cplx;
31 cplx = RealFourier::AllocCplxBuffer(3);
32 ASSERT_TRUE(cplx.get() != nullptr);
33 int64_t ptr_value = reinterpret_cast<int64_t>(cplx.get());
34 ASSERT_EQ(ptr_value % RealFourier::kFftBufferAlignment, 0);
38 TEST(RealFourierStaticsTest, OrderComputation) {
39 ASSERT_EQ(RealFourier::FftOrder(2000000), -1);
40 ASSERT_EQ(RealFourier::FftOrder((1 << RealFourier::kMaxFftOrder) + 1), -1);
41 ASSERT_EQ(RealFourier::FftOrder(1 << RealFourier::kMaxFftOrder),
42 RealFourier::kMaxFftOrder);
43 ASSERT_EQ(RealFourier::FftOrder(13), 4);
44 ASSERT_EQ(RealFourier::FftOrder(32), 5);
45 ASSERT_EQ(RealFourier::FftOrder(2), 1);
46 ASSERT_EQ(RealFourier::FftOrder(1), 0);
47 ASSERT_EQ(RealFourier::FftOrder(0), 0);
50 TEST(RealFourierStaticsTest, ComplexLengthComputation) {
51 ASSERT_EQ(RealFourier::ComplexLength(1), 2);
52 ASSERT_EQ(RealFourier::ComplexLength(2), 3);
53 ASSERT_EQ(RealFourier::ComplexLength(3), 5);
54 ASSERT_EQ(RealFourier::ComplexLength(4), 9);
55 ASSERT_EQ(RealFourier::ComplexLength(5), 17);
56 ASSERT_EQ(RealFourier::ComplexLength(7), 65);
59 class RealFourierTest : public ::testing::Test {
62 : rf_(new RealFourier(2)),
63 real_buffer_(RealFourier::AllocRealBuffer(4)),
64 cplx_buffer_(RealFourier::AllocCplxBuffer(3)) {}
70 const RealFourier* rf_;
71 const RealFourier::fft_real_scoper real_buffer_;
72 const RealFourier::fft_cplx_scoper cplx_buffer_;
75 TEST_F(RealFourierTest, SimpleForwardTransform) {
76 real_buffer_[0] = 1.0f;
77 real_buffer_[1] = 2.0f;
78 real_buffer_[2] = 3.0f;
79 real_buffer_[3] = 4.0f;
81 rf_->Forward(real_buffer_.get(), cplx_buffer_.get());
83 ASSERT_NEAR(cplx_buffer_[0].real(), 10.0f, 1e-8f);
84 ASSERT_NEAR(cplx_buffer_[0].imag(), 0.0f, 1e-8f);
85 ASSERT_NEAR(cplx_buffer_[1].real(), -2.0f, 1e-8f);
86 ASSERT_NEAR(cplx_buffer_[1].imag(), 2.0f, 1e-8f);
87 ASSERT_NEAR(cplx_buffer_[2].real(), -2.0f, 1e-8f);
88 ASSERT_NEAR(cplx_buffer_[2].imag(), 0.0f, 1e-8f);
91 TEST_F(RealFourierTest, SimpleBackwardTransform) {
92 cplx_buffer_[0] = complex<float>(10.0f, 0.0f);
93 cplx_buffer_[1] = complex<float>(-2.0f, 2.0f);
94 cplx_buffer_[2] = complex<float>(-2.0f, 0.0f);
96 rf_->Inverse(cplx_buffer_.get(), real_buffer_.get());
98 ASSERT_NEAR(real_buffer_[0], 1.0f, 1e-8f);
99 ASSERT_NEAR(real_buffer_[1], 2.0f, 1e-8f);
100 ASSERT_NEAR(real_buffer_[2], 3.0f, 1e-8f);
101 ASSERT_NEAR(real_buffer_[3], 4.0f, 1e-8f);
104 } // namespace webrtc