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
|
/*
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 "utils/sample_type_conversion.h"
#include "third_party/googletest/googletest/include/gtest/gtest.h"
namespace vraudio {
namespace {
TEST(MiscMath, Int16ToFloatTest) {
static const int16 kMinInt16 = -0x7FFF;
static const int16 kMaxInt16 = 0x7FFF;
static const float kMinFloat = -1.0f;
static const float kMaxFloat = 1.0f;
static const float kFloatRange = kMaxFloat - kMinFloat;
static const uint16 kInt16Range = kMaxInt16 - kMinInt16;
for (int16 i = kMinInt16; i < kMaxInt16; i = static_cast<int16>(i + 0xFF)) {
const float mapped_float =
static_cast<float>(i) / static_cast<float>(kInt16Range) * kFloatRange;
float float_result = 0.0f;
ConvertSampleToFloatFormat(i, &float_result);
EXPECT_FLOAT_EQ(mapped_float, float_result);
}
}
TEST(MiscMath, FloatToInt16Test) {
static const int16 kMinInt16 = -0x7FFF;
static const int16 kMaxInt16 = 0x7FFF;
static const float kMinFloat = -1.0f;
static const float kMaxFloat = 1.0f;
// NOTE: Int16 maximum is 0x7FFF, NOT 0x8000; see scheme 2) in
// http://goo.gl/NTRQ1a for background.
static const float kFloatRange = kMaxFloat - kMinFloat;
static const uint16 kInt16Range = kMaxInt16 - kMinInt16;
for (float i = kMinFloat; i < kMaxFloat; i += 0.005f) {
const int16 mapped_int = static_cast<int16>(i * kInt16Range / kFloatRange);
int16 int16_result = 0;
ConvertSampleFromFloatFormat(i, &int16_result);
EXPECT_EQ(mapped_int, int16_result);
}
}
TEST(MiscMath, FloatToInt16TestPositiveSaturate) {
// Maximum positive value is 2^15 - 1
static const int16 kMaxInt16 = 0x7FFF;
static const float kMaxFloat = 1.0f;
int16 int16_result = 0;
ConvertSampleFromFloatFormat(2 * kMaxFloat, &int16_result);
EXPECT_EQ(kMaxInt16, int16_result);
}
TEST(MiscMath, FloatToInt16TestNegativeSaturate) {
static const int16 kMinInt16 = -0x7FFF;
static const float kMinFloat = -1.0f;
int16 int16_result = 0;
ConvertSampleFromFloatFormat(2 * kMinFloat, &int16_result);
EXPECT_EQ(kMinInt16, int16_result);
}
} // namespace
} // namespace vraudio
|
