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
|
// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "services/audio/delay_buffer.h"
#include <algorithm>
#include "media/base/audio_bus.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace audio {
namespace {
constexpr int kChannels = 1;
constexpr int kMaxFrames = 32;
#define EXPECT_BUS_VALUES_EQ(bus, begin, end, value) \
{ \
const auto IsValue = [](float x) { return x == (value); }; \
EXPECT_TRUE(std::all_of((bus)->channel(0) + (begin), \
(bus)->channel(0) + (end) - (begin), IsValue)); \
}
TEST(DelayBufferTest, RecordsAMaximumNumberOfFrames) {
DelayBuffer buffer(kMaxFrames);
ASSERT_EQ(buffer.GetBeginPosition(), buffer.GetEndPosition());
constexpr int frames_per_bus = kMaxFrames / 4;
const auto bus = media::AudioBus::Create(kChannels, frames_per_bus);
std::fill(bus->channel(0), bus->channel(0) + frames_per_bus, 1.0);
// Fill the buffer.
DelayBuffer::FrameTicks position = 0;
for (int i = 0; i < 4; ++i) {
buffer.Write(position, *bus, 1.0);
position += frames_per_bus;
EXPECT_EQ(0, buffer.GetBeginPosition());
EXPECT_EQ(position, buffer.GetEndPosition());
}
// Writing just one more bus should cause the leading frames to be dropped.
buffer.Write(position, *bus, 1.0);
position += frames_per_bus;
EXPECT_EQ(position - kMaxFrames, buffer.GetBeginPosition());
EXPECT_EQ(position, buffer.GetEndPosition());
// Now, simulate a gap in the recording by recording the next bus late.
position += frames_per_bus * 2;
buffer.Write(position, *bus, 1.0);
position += frames_per_bus;
EXPECT_EQ(position - kMaxFrames, buffer.GetBeginPosition());
EXPECT_EQ(position, buffer.GetEndPosition());
}
TEST(DelayBufferTest, ReadsSilenceIfNothingWasRecorded) {
DelayBuffer buffer(kMaxFrames);
ASSERT_EQ(buffer.GetBeginPosition(), buffer.GetEndPosition());
DelayBuffer::FrameTicks position = 0;
constexpr int frames_per_bus = kMaxFrames / 4;
const auto bus = media::AudioBus::Create(kChannels, frames_per_bus);
for (int i = 0; i < 10; ++i) {
// Set data in the bus to confirm it is all going to be overwritten.
std::fill(bus->channel(0), bus->channel(0) + frames_per_bus, 1.0);
buffer.Read(position, frames_per_bus, bus.get());
EXPECT_EQ(buffer.GetBeginPosition(), buffer.GetEndPosition());
EXPECT_BUS_VALUES_EQ(bus, 0, frames_per_bus, 0.0);
position += frames_per_bus;
}
}
TEST(DelayBufferTest, ReadsSilenceIfOutsideRecordedRange) {
DelayBuffer buffer(kMaxFrames);
ASSERT_EQ(buffer.GetBeginPosition(), buffer.GetEndPosition());
constexpr int frames_per_bus = kMaxFrames / 4;
const auto bus = media::AudioBus::Create(kChannels, frames_per_bus);
std::fill(bus->channel(0), bus->channel(0) + frames_per_bus, 1.0);
// Fill the buffer.
DelayBuffer::FrameTicks position = 0;
for (int i = 0; i < 4; ++i) {
buffer.Write(position, *bus, 1.0);
position += frames_per_bus;
}
EXPECT_EQ(0, buffer.GetBeginPosition());
EXPECT_EQ(position, buffer.GetEndPosition());
// Read before the begin position and expect to get silence.
std::fill(bus->channel(0), bus->channel(0) + frames_per_bus, 0.5);
buffer.Read(-kMaxFrames, frames_per_bus, bus.get());
EXPECT_BUS_VALUES_EQ(bus, 0, frames_per_bus, 0.0);
// Read at a position one before the begin position. Expect the first sample
// to be 0.0, and the rest 1.0.
std::fill(bus->channel(0), bus->channel(0) + frames_per_bus, 0.5);
buffer.Read(buffer.GetBeginPosition() - 1, frames_per_bus, bus.get());
EXPECT_EQ(0.0, bus->channel(0)[0]);
EXPECT_BUS_VALUES_EQ(bus, 1, frames_per_bus - 1, 1.0);
// Read at a position where the last sample should be 0.0 and the rest 1.0.
std::fill(bus->channel(0), bus->channel(0) + frames_per_bus, 0.5);
buffer.Read(buffer.GetEndPosition() - frames_per_bus + 1, frames_per_bus,
bus.get());
EXPECT_BUS_VALUES_EQ(bus, 0, frames_per_bus - 1, 1.0);
EXPECT_EQ(0.0, bus->channel(0)[frames_per_bus - 1]);
// Read after the end position and expect to get silence.
std::fill(bus->channel(0), bus->channel(0) + frames_per_bus, 0.5);
buffer.Read(kMaxFrames, frames_per_bus, bus.get());
EXPECT_BUS_VALUES_EQ(bus, 0, frames_per_bus, 0.0);
}
TEST(DelayBufferTest, ReadsGapsInRecording) {
DelayBuffer buffer(kMaxFrames);
ASSERT_EQ(buffer.GetBeginPosition(), buffer.GetEndPosition());
constexpr int frames_per_bus = kMaxFrames / 4;
const auto bus = media::AudioBus::Create(kChannels, frames_per_bus);
std::fill(bus->channel(0), bus->channel(0) + frames_per_bus, 1.0);
// Fill the buffer, but with a gap in the third quarter of it.
DelayBuffer::FrameTicks record_position = 0;
for (int i = 0; i < 4; ++i) {
if (i != 2) {
buffer.Write(record_position, *bus, 1.0);
}
record_position += frames_per_bus;
}
EXPECT_EQ(0, buffer.GetBeginPosition());
EXPECT_EQ(record_position, buffer.GetEndPosition());
// Read through the whole range, but offset by one frame early. Confirm the
// silence gap appears in the right place.
DelayBuffer::FrameTicks read_position = -1;
std::fill(bus->channel(0), bus->channel(0) + frames_per_bus, 0.5);
buffer.Read(read_position, frames_per_bus, bus.get());
read_position += frames_per_bus;
EXPECT_EQ(0.0, bus->channel(0)[0]);
EXPECT_BUS_VALUES_EQ(bus, 1, frames_per_bus - 1, 1.0);
std::fill(bus->channel(0), bus->channel(0) + frames_per_bus, 0.5);
buffer.Read(read_position, frames_per_bus, bus.get());
read_position += frames_per_bus;
EXPECT_BUS_VALUES_EQ(bus, 0, frames_per_bus, 1.0);
std::fill(bus->channel(0), bus->channel(0) + frames_per_bus, 0.5);
buffer.Read(read_position, frames_per_bus, bus.get());
read_position += frames_per_bus;
EXPECT_EQ(1.0, bus->channel(0)[0]);
// The gap begins.
EXPECT_BUS_VALUES_EQ(bus, 1, frames_per_bus - 1, 0.0);
std::fill(bus->channel(0), bus->channel(0) + frames_per_bus, 0.5);
buffer.Read(read_position, frames_per_bus, bus.get());
read_position += frames_per_bus;
EXPECT_EQ(0.0, bus->channel(0)[0]);
// The gap ends.
EXPECT_BUS_VALUES_EQ(bus, 1, frames_per_bus - 1, 1.0);
}
} // namespace
} // namespace audio
|
