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/*
* Copyright (c) 2014 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 "common_audio/real_fourier.h"
#include <stdlib.h>
#include "common_audio/real_fourier_ooura.h"
#include "test/gtest.h"
namespace webrtc {
using std::complex;
TEST(RealFourierStaticsTest, AllocatorAlignment) {
{
RealFourier::fft_real_scoper real;
real = RealFourier::AllocRealBuffer(3);
ASSERT_TRUE(real.get() != nullptr);
uintptr_t ptr_value = reinterpret_cast<uintptr_t>(real.get());
EXPECT_EQ(0u, ptr_value % RealFourier::kFftBufferAlignment);
}
{
RealFourier::fft_cplx_scoper cplx;
cplx = RealFourier::AllocCplxBuffer(3);
ASSERT_TRUE(cplx.get() != nullptr);
uintptr_t ptr_value = reinterpret_cast<uintptr_t>(cplx.get());
EXPECT_EQ(0u, ptr_value % RealFourier::kFftBufferAlignment);
}
}
TEST(RealFourierStaticsTest, OrderComputation) {
EXPECT_EQ(4, RealFourier::FftOrder(13));
EXPECT_EQ(5, RealFourier::FftOrder(32));
EXPECT_EQ(1, RealFourier::FftOrder(2));
EXPECT_EQ(0, RealFourier::FftOrder(1));
}
TEST(RealFourierStaticsTest, ComplexLengthComputation) {
EXPECT_EQ(2U, RealFourier::ComplexLength(1));
EXPECT_EQ(3U, RealFourier::ComplexLength(2));
EXPECT_EQ(5U, RealFourier::ComplexLength(3));
EXPECT_EQ(9U, RealFourier::ComplexLength(4));
EXPECT_EQ(17U, RealFourier::ComplexLength(5));
EXPECT_EQ(65U, RealFourier::ComplexLength(7));
}
template <typename T>
class RealFourierTest : public ::testing::Test {
protected:
RealFourierTest()
: rf_(2),
real_buffer_(RealFourier::AllocRealBuffer(4)),
cplx_buffer_(RealFourier::AllocCplxBuffer(3)) {}
~RealFourierTest() {}
T rf_;
const RealFourier::fft_real_scoper real_buffer_;
const RealFourier::fft_cplx_scoper cplx_buffer_;
};
using FftTypes = ::testing::Types<RealFourierOoura>;
TYPED_TEST_SUITE(RealFourierTest, FftTypes);
TYPED_TEST(RealFourierTest, SimpleForwardTransform) {
this->real_buffer_[0] = 1.0f;
this->real_buffer_[1] = 2.0f;
this->real_buffer_[2] = 3.0f;
this->real_buffer_[3] = 4.0f;
this->rf_.Forward(this->real_buffer_.get(), this->cplx_buffer_.get());
EXPECT_NEAR(this->cplx_buffer_[0].real(), 10.0f, 1e-8f);
EXPECT_NEAR(this->cplx_buffer_[0].imag(), 0.0f, 1e-8f);
EXPECT_NEAR(this->cplx_buffer_[1].real(), -2.0f, 1e-8f);
EXPECT_NEAR(this->cplx_buffer_[1].imag(), 2.0f, 1e-8f);
EXPECT_NEAR(this->cplx_buffer_[2].real(), -2.0f, 1e-8f);
EXPECT_NEAR(this->cplx_buffer_[2].imag(), 0.0f, 1e-8f);
}
TYPED_TEST(RealFourierTest, SimpleBackwardTransform) {
this->cplx_buffer_[0] = complex<float>(10.0f, 0.0f);
this->cplx_buffer_[1] = complex<float>(-2.0f, 2.0f);
this->cplx_buffer_[2] = complex<float>(-2.0f, 0.0f);
this->rf_.Inverse(this->cplx_buffer_.get(), this->real_buffer_.get());
EXPECT_NEAR(this->real_buffer_[0], 1.0f, 1e-8f);
EXPECT_NEAR(this->real_buffer_[1], 2.0f, 1e-8f);
EXPECT_NEAR(this->real_buffer_[2], 3.0f, 1e-8f);
EXPECT_NEAR(this->real_buffer_[3], 4.0f, 1e-8f);
}
} // namespace webrtc
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