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
183
184
185
186
|
/*
Copyright 2018 Google Inc. All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS-IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#include "graph/occlusion_node.h"
#include "third_party/googletest/googletest/include/gtest/gtest.h"
#include "base/constants_and_types.h"
#include "utils/test_util.h"
namespace vraudio {
namespace {
// Number of frames per buffer.
const size_t kFramesPerBuffer = 256;
// Sampling rate.
const int kSampleRate = 48000;
// Generated sawtooth length for test buffers.
const size_t kSawtoothLength = 16;
// Source id.
const SourceId kSourceId = 1;
} // namespace
class OcclusionNodeTest : public ::testing::Test {
protected:
OcclusionNodeTest()
: system_settings_(kNumStereoChannels, kFramesPerBuffer, kSampleRate) {}
void SetUp() override {
system_settings_.GetSourceParametersManager()->Register(kSourceId);
}
// Function which wraps the buffer passed in a vector for processing and
// returns the output of the occlusion nodes AudioProcess method.
const AudioBuffer* GetProcessedData(const AudioBuffer* input_buffer,
OcclusionNode* occlusion_node) {
std::vector<const AudioBuffer*> input_buffers;
input_buffers.push_back(input_buffer);
return occlusion_node->AudioProcess(
ProcessingNode::NodeInput(input_buffers));
}
// Returns a pointer to the parameters of the source.
SourceParameters* GetParameters() {
return system_settings_.GetSourceParametersManager()->GetMutableParameters(
kSourceId);
}
// System settings.
SystemSettings system_settings_;
};
// Test to ensure that no effect is made on a buffer of input if both occlusion
// and self-occlusion are absent.
TEST_F(OcclusionNodeTest, NoOcclusionTest) {
OcclusionNode occlusion_processor(kSourceId, system_settings_);
AudioBuffer input(1, kFramesPerBuffer);
input.set_source_id(kSourceId);
GenerateSawToothSignal(kSawtoothLength, &input[0]);
const AudioBuffer* output = GetProcessedData(&input, &occlusion_processor);
const bool buffers_identical =
CompareAudioBuffers((*output)[0], input[0], kEpsilonFloat);
EXPECT_TRUE(buffers_identical);
}
// Test to ensure that a more heavily occluded object shows a lower energy
// output.
TEST_F(OcclusionNodeTest, OcclusionTest) {
OcclusionNode occlusion_processor_1(kSourceId, system_settings_);
OcclusionNode occlusion_processor_2(kSourceId, system_settings_);
AudioBuffer input(kNumMonoChannels, kFramesPerBuffer);
GenerateSawToothSignal(kSawtoothLength, &input[0]);
AudioBuffer input_1;
input_1 = input;
input_1.set_source_id(kSourceId);
AudioBuffer input_2;
input_2 = input;
input_2.set_source_id(kSourceId);
SourceParameters* parameters = GetParameters();
parameters->occlusion_intensity = 0.5f;
const AudioBuffer* output_1 =
GetProcessedData(&input_1, &occlusion_processor_1);
parameters->occlusion_intensity = 1.0f;
const AudioBuffer* output_2 =
GetProcessedData(&input_2, &occlusion_processor_2);
const double output_1_energy = CalculateSignalRms((*output_1)[0]);
const double output_2_energy = CalculateSignalRms((*output_2)[0]);
const double input_energy = CalculateSignalRms(input[0]);
EXPECT_LT(output_1_energy, input_energy);
EXPECT_LT(output_2_energy, output_1_energy);
}
// Test to ensure that setting a non-omnidirectional listener directivity
// pattern shows a lower energy output when the listener orientation is pointing
// away from a source.
TEST_F(OcclusionNodeTest, ListenerDirectivityTest) {
OcclusionNode occlusion_processor(kSourceId, system_settings_);
AudioBuffer input(kNumMonoChannels, kFramesPerBuffer);
input.set_source_id(kSourceId);
GenerateSawToothSignal(kSawtoothLength, &input[0]);
// Set a hyper-cardioid shaped listener directivity for the source input.
SourceParameters* parameters = GetParameters();
parameters->listener_directivity_alpha = 0.5f;
parameters->listener_directivity_order = 2.0f;
// Set listener position to one meter away from the origin in Z axis. This is
// required for the listener directivity properties to take effect.
system_settings_.SetHeadPosition(WorldPosition(0.0f, 0.0f, 1.0f));
const double input_energy = CalculateSignalRms(input[0]);
// Process input with identity listener orientation.
const AudioBuffer* output_default =
GetProcessedData(&input, &occlusion_processor);
const double output_default_energy = CalculateSignalRms((*output_default)[0]);
// Process input with 90 degrees rotated listener orientation about Y axis.
system_settings_.SetHeadRotation(
WorldRotation(0.0f, kInverseSqrtTwo, 0.0f, kInverseSqrtTwo));
const AudioBuffer* output_rotated =
GetProcessedData(&input, &occlusion_processor);
const double output_rotated_energy = CalculateSignalRms((*output_rotated)[0]);
// Test if the output energy is lower when the listener was rotated away from
// the source.
EXPECT_NEAR(output_default_energy, input_energy, kEpsilonFloat);
EXPECT_LT(output_rotated_energy, output_default_energy);
}
// Test to ensure that a more heavily self occluded source shows a lower energy
// output.
TEST_F(OcclusionNodeTest, SourceDirectivityTest) {
OcclusionNode occlusion_processor_1(kSourceId, system_settings_);
OcclusionNode occlusion_processor_2(kSourceId, system_settings_);
AudioBuffer input(kNumMonoChannels, kFramesPerBuffer);
input.set_source_id(kSourceId);
GenerateSawToothSignal(kSawtoothLength, &input[0]);
AudioBuffer input_1;
input_1 = input;
AudioBuffer input_2;
input_2 = input;
SourceParameters* parameters = GetParameters();
parameters->directivity_alpha = 0.25f;
parameters->directivity_order = 2.0f;
const AudioBuffer* output_1 =
GetProcessedData(&input_1, &occlusion_processor_1);
parameters->directivity_order = 4.0f;
parameters->directivity_alpha = 0.25f;
const AudioBuffer* output_2 =
GetProcessedData(&input_2, &occlusion_processor_2);
const double output_1_energy = CalculateSignalRms((*output_1)[0]);
const double output_2_energy = CalculateSignalRms((*output_2)[0]);
const double input_energy = CalculateSignalRms(input[0]);
EXPECT_LT(output_1_energy, input_energy);
EXPECT_LT(output_2_energy, output_1_energy);
}
} // namespace vraudio
|
