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
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
|
// Copyright 2014 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 <stdint.h>
#include "base/memory/scoped_ptr.h"
#include "media/base/audio_buffer.h"
#include "media/base/audio_buffer_converter.h"
#include "media/base/sinc_resampler.h"
#include "media/base/test_helpers.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace media {
// Important: Use an odd buffer size here so SIMD issues are caught.
const int kOutFrameSize = 441;
const int kOutSampleRate = 44100;
const ChannelLayout kOutChannelLayout = CHANNEL_LAYOUT_STEREO;
const int kOutChannelCount = 2;
static scoped_refptr<AudioBuffer> MakeTestBuffer(int sample_rate,
ChannelLayout channel_layout,
int channel_count,
int frames) {
return MakeAudioBuffer<uint8_t>(kSampleFormatU8, channel_layout,
channel_count, sample_rate, 0, 1, frames,
base::TimeDelta::FromSeconds(0));
}
class AudioBufferConverterTest : public ::testing::Test {
public:
AudioBufferConverterTest()
: input_frames_(0),
expected_output_frames_(0.0),
output_frames_(0),
output_params_(AudioParameters::AUDIO_PCM_LOW_LATENCY,
kOutChannelLayout,
kOutSampleRate,
16,
kOutFrameSize) {
audio_buffer_converter_.reset(new AudioBufferConverter(output_params_));
}
void Reset() {
audio_buffer_converter_->Reset();
output_frames_ = expected_output_frames_ = input_frames_ = 0;
}
void AddInput(const scoped_refptr<AudioBuffer>& in) {
if (!in->end_of_stream()) {
input_frames_ += in->frame_count();
expected_output_frames_ +=
in->frame_count() *
(static_cast<double>(output_params_.sample_rate()) /
in->sample_rate());
}
audio_buffer_converter_->AddInput(in);
}
void ConsumeOutput() {
ASSERT_TRUE(audio_buffer_converter_->HasNextBuffer());
scoped_refptr<AudioBuffer> out = audio_buffer_converter_->GetNextBuffer();
if (!out->end_of_stream()) {
output_frames_ += out->frame_count();
EXPECT_EQ(out->sample_rate(), output_params_.sample_rate());
EXPECT_EQ(out->channel_layout(), output_params_.channel_layout());
EXPECT_EQ(out->channel_count(), output_params_.channels());
} else {
EXPECT_FALSE(audio_buffer_converter_->HasNextBuffer());
}
}
void ConsumeAllOutput() {
AddInput(AudioBuffer::CreateEOSBuffer());
while (audio_buffer_converter_->HasNextBuffer())
ConsumeOutput();
EXPECT_EQ(output_frames_, ceil(expected_output_frames_));
}
protected:
scoped_ptr<AudioBufferConverter> audio_buffer_converter_;
int input_frames_;
double expected_output_frames_;
int output_frames_;
int input_buffers_;
AudioParameters output_params_;
};
TEST_F(AudioBufferConverterTest, PassThrough) {
scoped_refptr<AudioBuffer> in =
MakeTestBuffer(kOutSampleRate, kOutChannelLayout, kOutChannelCount, 512);
AddInput(in);
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, Downsample) {
scoped_refptr<AudioBuffer> in =
MakeTestBuffer(48000, kOutChannelLayout, kOutChannelCount, 512);
AddInput(in);
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, Upsample) {
scoped_refptr<AudioBuffer> in =
MakeTestBuffer(8000, kOutChannelLayout, kOutChannelCount, 512);
AddInput(in);
ConsumeAllOutput();
}
// Test resampling a buffer smaller than the SincResampler's kernel size.
TEST_F(AudioBufferConverterTest, Resample_TinyBuffer) {
AddInput(MakeTestBuffer(
48000, CHANNEL_LAYOUT_STEREO, 2, SincResampler::kKernelSize - 1));
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, Resample_DifferingBufferSizes) {
const int input_sample_rate = 48000;
AddInput(MakeTestBuffer(
input_sample_rate, kOutChannelLayout, kOutChannelCount, 100));
AddInput(MakeTestBuffer(
input_sample_rate, kOutChannelLayout, kOutChannelCount, 200));
AddInput(MakeTestBuffer(
input_sample_rate, kOutChannelLayout, kOutChannelCount, 300));
AddInput(MakeTestBuffer(
input_sample_rate, kOutChannelLayout, kOutChannelCount, 400));
AddInput(MakeTestBuffer(
input_sample_rate, kOutChannelLayout, kOutChannelCount, 500));
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, ChannelDownmix) {
scoped_refptr<AudioBuffer> in =
MakeTestBuffer(kOutSampleRate, CHANNEL_LAYOUT_MONO, 1, 512);
AddInput(in);
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, ChannelUpmix) {
scoped_refptr<AudioBuffer> in =
MakeTestBuffer(kOutSampleRate, CHANNEL_LAYOUT_5_1, 6, 512);
AddInput(in);
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, ResampleAndRemix) {
scoped_refptr<AudioBuffer> in =
MakeTestBuffer(48000, CHANNEL_LAYOUT_5_1, 6, 512);
AddInput(in);
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, ConfigChange_SampleRate) {
AddInput(MakeTestBuffer(48000, kOutChannelLayout, kOutChannelCount, 512));
AddInput(MakeTestBuffer(44100, kOutChannelLayout, kOutChannelCount, 512));
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, ConfigChange_ChannelLayout) {
AddInput(MakeTestBuffer(kOutSampleRate, CHANNEL_LAYOUT_STEREO, 2, 512));
AddInput(MakeTestBuffer(kOutSampleRate, CHANNEL_LAYOUT_MONO, 1, 512));
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, ConfigChange_SampleRateAndChannelLayout) {
AddInput(MakeTestBuffer(44100, CHANNEL_LAYOUT_STEREO, 2, 512));
AddInput(MakeTestBuffer(48000, CHANNEL_LAYOUT_MONO, 1, 512));
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, ConfigChange_Multiple) {
AddInput(MakeTestBuffer(44100, CHANNEL_LAYOUT_STEREO, 2, 512));
AddInput(MakeTestBuffer(48000, CHANNEL_LAYOUT_MONO, 1, 512));
AddInput(MakeTestBuffer(44100, CHANNEL_LAYOUT_5_1, 6, 512));
AddInput(MakeTestBuffer(22050, CHANNEL_LAYOUT_STEREO, 2, 512));
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, Reset) {
AddInput(MakeTestBuffer(44100, CHANNEL_LAYOUT_STEREO, 2, 512));
Reset();
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, ResampleThenReset) {
// Resampling is likely to leave some data buffered in AudioConverter's
// fifo or resampler, so make sure Reset() cleans that all up.
AddInput(MakeTestBuffer(48000, CHANNEL_LAYOUT_STEREO, 2, 512));
Reset();
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, ResetThenConvert) {
AddInput(
MakeTestBuffer(kOutSampleRate, kOutChannelLayout, kOutChannelCount, 512));
Reset();
// Make sure we can keep using the AudioBufferConverter after we've Reset().
AddInput(
MakeTestBuffer(kOutSampleRate, kOutChannelLayout, kOutChannelCount, 512));
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, DiscreteChannelLayout) {
output_params_ =
AudioParameters(AudioParameters::AUDIO_PCM_LOW_LATENCY,
CHANNEL_LAYOUT_DISCRETE, kOutSampleRate, 16, 512);
output_params_.set_channels_for_discrete(2);
audio_buffer_converter_.reset(new AudioBufferConverter(output_params_));
AddInput(MakeTestBuffer(kOutSampleRate, CHANNEL_LAYOUT_STEREO, 2, 512));
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, LargeBuffersResampling) {
output_params_ = AudioParameters(AudioParameters::AUDIO_PCM_LOW_LATENCY,
kOutChannelLayout,
kOutSampleRate,
16,
2048);
audio_buffer_converter_.reset(new AudioBufferConverter(output_params_));
const int kInputSampleRate = 48000;
const int kInputFrameSize = 8192;
ASSERT_NE(kInputSampleRate, kOutSampleRate);
const int kInputBuffers = 3;
for (int i = 0; i < kInputBuffers; ++i) {
AddInput(MakeTestBuffer(kInputSampleRate,
kOutChannelLayout,
kOutChannelCount,
kInputFrameSize));
}
// Do not add an EOS packet here, as it will invoke flushing.
while (audio_buffer_converter_->HasNextBuffer())
ConsumeOutput();
// Since the input buffer size is a multiple of the input request size there
// should never be any frames remaining at this point.
ASSERT_EQ(kInputFrameSize %
audio_buffer_converter_->input_buffer_size_for_testing(),
0);
EXPECT_EQ(0, audio_buffer_converter_->input_frames_left_for_testing());
}
} // namespace media
|