1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
/*
* Copyright (c) 2019 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 "modules/audio_processing/utility/pffft_wrapper.h"
#include <algorithm>
#include <cstdlib>
#include <memory>
#include "test/gtest.h"
#include "third_party/pffft/src/pffft.h"
namespace webrtc {
namespace test {
namespace {
constexpr size_t kMaxValidSizeCheck = 1024;
static constexpr int kFftSizes[] = {
16, 32, 64, 96, 128, 160, 192, 256, 288, 384, 5 * 96, 512,
576, 5 * 128, 800, 864, 1024, 2048, 2592, 4000, 4096, 12000, 36864};
void CreatePffftWrapper(size_t fft_size, Pffft::FftType fft_type) {
Pffft pffft_wrapper(fft_size, fft_type);
}
float* AllocateScratchBuffer(size_t fft_size, bool complex_fft) {
return static_cast<float*>(
pffft_aligned_malloc(fft_size * (complex_fft ? 2 : 1) * sizeof(float)));
}
double frand() {
return std::rand() / static_cast<double>(RAND_MAX);
}
void ExpectArrayViewsEquality(rtc::ArrayView<const float> a,
rtc::ArrayView<const float> b) {
ASSERT_EQ(a.size(), b.size());
for (size_t i = 0; i < a.size(); ++i) {
SCOPED_TRACE(i);
EXPECT_EQ(a[i], b[i]);
}
}
// Compares the output of the PFFFT C++ wrapper to that of the C PFFFT.
// Bit-exactness is expected.
void PffftValidateWrapper(size_t fft_size, bool complex_fft) {
// Always use the same seed to avoid flakiness.
std::srand(0);
// Init PFFFT.
PFFFT_Setup* pffft_status =
pffft_new_setup(fft_size, complex_fft ? PFFFT_COMPLEX : PFFFT_REAL);
ASSERT_TRUE(pffft_status) << "FFT size (" << fft_size << ") not supported.";
size_t num_floats = fft_size * (complex_fft ? 2 : 1);
int num_bytes = static_cast<int>(num_floats) * sizeof(float);
float* in = static_cast<float*>(pffft_aligned_malloc(num_bytes));
float* out = static_cast<float*>(pffft_aligned_malloc(num_bytes));
float* scratch = AllocateScratchBuffer(fft_size, complex_fft);
// Init PFFFT C++ wrapper.
Pffft::FftType fft_type =
complex_fft ? Pffft::FftType::kComplex : Pffft::FftType::kReal;
ASSERT_TRUE(Pffft::IsValidFftSize(fft_size, fft_type));
Pffft pffft_wrapper(fft_size, fft_type);
auto in_wrapper = pffft_wrapper.CreateBuffer();
auto out_wrapper = pffft_wrapper.CreateBuffer();
// Input and output buffers views.
rtc::ArrayView<float> in_view(in, num_floats);
rtc::ArrayView<float> out_view(out, num_floats);
auto in_wrapper_view = in_wrapper->GetView();
EXPECT_EQ(in_wrapper_view.size(), num_floats);
auto out_wrapper_view = out_wrapper->GetConstView();
EXPECT_EQ(out_wrapper_view.size(), num_floats);
// Random input data.
for (size_t i = 0; i < num_floats; ++i) {
in_wrapper_view[i] = in[i] = static_cast<float>(frand() * 2.0 - 1.0);
}
// Forward transform.
pffft_transform(pffft_status, in, out, scratch, PFFFT_FORWARD);
pffft_wrapper.ForwardTransform(*in_wrapper, out_wrapper.get(),
/*ordered=*/false);
ExpectArrayViewsEquality(out_view, out_wrapper_view);
// Copy the FFT results into the input buffers to compute the backward FFT.
std::copy(out_view.begin(), out_view.end(), in_view.begin());
std::copy(out_wrapper_view.begin(), out_wrapper_view.end(),
in_wrapper_view.begin());
// Backward transform.
pffft_transform(pffft_status, in, out, scratch, PFFFT_BACKWARD);
pffft_wrapper.BackwardTransform(*in_wrapper, out_wrapper.get(),
/*ordered=*/false);
ExpectArrayViewsEquality(out_view, out_wrapper_view);
pffft_destroy_setup(pffft_status);
pffft_aligned_free(in);
pffft_aligned_free(out);
pffft_aligned_free(scratch);
}
} // namespace
TEST(PffftTest, CreateWrapperWithValidSize) {
for (size_t fft_size = 0; fft_size < kMaxValidSizeCheck; ++fft_size) {
SCOPED_TRACE(fft_size);
if (Pffft::IsValidFftSize(fft_size, Pffft::FftType::kReal)) {
CreatePffftWrapper(fft_size, Pffft::FftType::kReal);
}
if (Pffft::IsValidFftSize(fft_size, Pffft::FftType::kComplex)) {
CreatePffftWrapper(fft_size, Pffft::FftType::kComplex);
}
}
}
#if !defined(NDEBUG) && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
class PffftInvalidSizeDeathTest : public ::testing::Test,
public ::testing::WithParamInterface<size_t> {
};
TEST_P(PffftInvalidSizeDeathTest, DoNotCreateRealWrapper) {
size_t fft_size = GetParam();
ASSERT_FALSE(Pffft::IsValidFftSize(fft_size, Pffft::FftType::kReal));
EXPECT_DEATH(CreatePffftWrapper(fft_size, Pffft::FftType::kReal), "");
}
TEST_P(PffftInvalidSizeDeathTest, DoNotCreateComplexWrapper) {
size_t fft_size = GetParam();
ASSERT_FALSE(Pffft::IsValidFftSize(fft_size, Pffft::FftType::kComplex));
EXPECT_DEATH(CreatePffftWrapper(fft_size, Pffft::FftType::kComplex), "");
}
INSTANTIATE_TEST_SUITE_P(PffftTest,
PffftInvalidSizeDeathTest,
::testing::Values(17,
33,
65,
97,
129,
161,
193,
257,
289,
385,
481,
513,
577,
641,
801,
865,
1025));
#endif
// TODO(https://crbug.com/webrtc/9577): Enable once SIMD is always enabled.
TEST(PffftTest, DISABLED_CheckSimd) {
EXPECT_TRUE(Pffft::IsSimdEnabled());
}
TEST(PffftTest, FftBitExactness) {
for (int fft_size : kFftSizes) {
SCOPED_TRACE(fft_size);
if (fft_size != 16) {
PffftValidateWrapper(fft_size, /*complex_fft=*/false);
}
PffftValidateWrapper(fft_size, /*complex_fft=*/true);
}
}
} // namespace test
} // namespace webrtc
|
