| // Copyright 2016 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 "media/base/audio_latency.h" |
| |
| #include <stdint.h> |
| |
| #include "base/logging.h" |
| #include "base/time/time.h" |
| #include "build/build_config.h" |
| #include "media/base/limits.h" |
| #include "testing/gtest/include/gtest/gtest.h" |
| |
| namespace media { |
| |
| // Tuple of <sample rate, hardware buffer size, min buffer size, max buffer |
| // size>. |
| using AudioLatencyTestData = std::tuple<int, int, int, int>; |
| |
| class AudioLatencyTest : public testing::TestWithParam<AudioLatencyTestData> { |
| public: |
| AudioLatencyTest() = default; |
| ~AudioLatencyTest() override = default; |
| |
| void TestExactBufferSizes() { |
| const int hardware_sample_rate = std::get<0>(GetParam()); |
| const int hardware_buffer_size = std::get<1>(GetParam()); |
| const int min_buffer_size = std::get<2>(GetParam()); |
| const int max_buffer_size = std::get<3>(GetParam()); |
| |
| const int platform_min_buffer_size = |
| min_buffer_size ? min_buffer_size : hardware_buffer_size; |
| |
| // Windows 10 may allow exactly the minimum buffer size using the IAudioClient3 |
| // API but any other buffer size must be a multiple of the hardware_buffer_size |
| // and not the min_buffer_size. |
| #if defined(OS_WIN) |
| const int multiplier = hardware_buffer_size; |
| #else |
| const int multiplier = platform_min_buffer_size; |
| #endif |
| |
| const int platform_max_buffer_size = |
| max_buffer_size |
| ? (limits::kMaxWebAudioBufferSize / max_buffer_size) * |
| max_buffer_size |
| : (limits::kMaxWebAudioBufferSize / multiplier) * multiplier; |
| |
| EXPECT_EQ(platform_min_buffer_size, |
| media::AudioLatency::GetExactBufferSize( |
| base::TimeDelta::FromSecondsD(0.0), hardware_sample_rate, |
| hardware_buffer_size, min_buffer_size, max_buffer_size, |
| limits::kMaxWebAudioBufferSize)); |
| EXPECT_EQ( |
| platform_min_buffer_size, |
| media::AudioLatency::GetExactBufferSize( |
| base::TimeDelta::FromSecondsD( |
| min_buffer_size / static_cast<double>(hardware_sample_rate)), |
| hardware_sample_rate, hardware_buffer_size, min_buffer_size, |
| max_buffer_size, limits::kMaxWebAudioBufferSize)); |
| EXPECT_EQ( |
| multiplier * 2, |
| media::AudioLatency::GetExactBufferSize( |
| base::TimeDelta::FromSecondsD( |
| (multiplier * 2) / static_cast<double>(hardware_sample_rate)), |
| hardware_sample_rate, hardware_buffer_size, min_buffer_size, |
| max_buffer_size, limits::kMaxWebAudioBufferSize)); |
| EXPECT_EQ( |
| multiplier * 2, |
| media::AudioLatency::GetExactBufferSize( |
| base::TimeDelta::FromSecondsD( |
| (multiplier * 1.1) / static_cast<double>(hardware_sample_rate)), |
| hardware_sample_rate, hardware_buffer_size, min_buffer_size, |
| max_buffer_size, limits::kMaxWebAudioBufferSize)); |
| EXPECT_EQ(platform_max_buffer_size, |
| media::AudioLatency::GetExactBufferSize( |
| base::TimeDelta::FromSecondsD(10.0), hardware_sample_rate, |
| hardware_buffer_size, min_buffer_size, max_buffer_size, |
| limits::kMaxWebAudioBufferSize)); |
| if (max_buffer_size) { |
| EXPECT_EQ( |
| max_buffer_size, |
| media::AudioLatency::GetExactBufferSize( |
| base::TimeDelta::FromSecondsD( |
| max_buffer_size / static_cast<double>(hardware_sample_rate)), |
| hardware_sample_rate, hardware_buffer_size, min_buffer_size, |
| max_buffer_size, limits::kMaxWebAudioBufferSize)); |
| } |
| |
| #if defined(OS_WIN) |
| if (min_buffer_size && min_buffer_size < hardware_buffer_size) { |
| EXPECT_EQ(hardware_buffer_size, |
| media::AudioLatency::GetExactBufferSize( |
| base::TimeDelta::FromSecondsD( |
| (min_buffer_size * 1.1) / |
| static_cast<double>(hardware_sample_rate)), |
| hardware_sample_rate, hardware_buffer_size, min_buffer_size, |
| max_buffer_size, limits::kMaxWebAudioBufferSize)); |
| } |
| #elif defined(OS_MACOSX) |
| EXPECT_EQ(limits::kMaxWebAudioBufferSize, |
| media::AudioLatency::GetExactBufferSize( |
| base::TimeDelta::FromSecondsD( |
| (limits::kMaxAudioBufferSize * 1.1) / |
| static_cast<double>(hardware_sample_rate)), |
| hardware_sample_rate, hardware_buffer_size, min_buffer_size, |
| max_buffer_size, limits::kMaxWebAudioBufferSize)); |
| #endif |
| |
| int previous_buffer_size = 0; |
| for (int i = 0; i < 1000; i++) { |
| int buffer_size = media::AudioLatency::GetExactBufferSize( |
| base::TimeDelta::FromSecondsD(i / 1000.0), hardware_sample_rate, |
| hardware_buffer_size, min_buffer_size, max_buffer_size, |
| limits::kMaxWebAudioBufferSize); |
| EXPECT_GE(buffer_size, previous_buffer_size); |
| #if defined(OS_WIN) |
| EXPECT_TRUE(buffer_size == min_buffer_size || |
| buffer_size % multiplier == 0 || |
| buffer_size % max_buffer_size == 0); |
| #else |
| EXPECT_EQ(buffer_size, buffer_size / multiplier * multiplier); |
| #endif |
| previous_buffer_size = buffer_size; |
| } |
| } |
| }; |
| |
| // TODO(olka): extend unit tests, use real-world sample rates. |
| |
| TEST(AudioLatency, HighLatencyBufferSizes) { |
| #if defined(OS_WIN) |
| for (int i = 6400; i <= 204800; i *= 2) { |
| EXPECT_EQ(2 * (i / 100), |
| AudioLatency::GetHighLatencyBufferSize(i, i / 100)); |
| } |
| #else |
| for (int i = 6400; i <= 204800; i *= 2) |
| #if defined(USE_CRAS) |
| EXPECT_EQ(8 * (i / 100), AudioLatency::GetHighLatencyBufferSize(i, 32)); |
| #else |
| EXPECT_EQ(2 * (i / 100), AudioLatency::GetHighLatencyBufferSize(i, 32)); |
| #endif // defined(USE_CRAS) |
| #endif // defined(OS_WIN) |
| } |
| |
| TEST(AudioLatency, InteractiveBufferSizes) { |
| for (int i = 6400; i <= 204800; i *= 2) |
| EXPECT_EQ(i / 100, AudioLatency::GetInteractiveBufferSize(i / 100)); |
| } |
| |
| TEST(AudioLatency, RtcBufferSizes) { |
| for (int i = 6400; i < 204800; i *= 2) { |
| EXPECT_EQ(i / 100, AudioLatency::GetRtcBufferSize(i, 0)); |
| #if defined(OS_WIN) |
| EXPECT_EQ(500, AudioLatency::GetRtcBufferSize(i, 500)); |
| #elif defined(OS_ANDROID) |
| EXPECT_EQ(i / 50, AudioLatency::GetRtcBufferSize(i, i / 50 - 1)); |
| EXPECT_EQ(i / 50 + 1, AudioLatency::GetRtcBufferSize(i, i / 50 + 1)); |
| #else |
| EXPECT_EQ(i / 100, AudioLatency::GetRtcBufferSize(i, 500)); |
| #endif // defined(OS_WIN) |
| } |
| } |
| |
| TEST_P(AudioLatencyTest, ExactBufferSizes) { |
| TestExactBufferSizes(); |
| } |
| |
| INSTANTIATE_TEST_SUITE_P( |
| All, |
| AudioLatencyTest, |
| #if defined(OS_WIN) |
| // Windows 10 with supported driver will have valid min and max buffer sizes |
| // whereas older Windows will have zeros. The specific min, max and hardware |
| // are device-dependent. |
| testing::Values(std::make_tuple(44100, 440, 128, 440), |
| std::make_tuple(44100, 440, 440, 440), |
| std::make_tuple(44100, 440, 440, 880), |
| std::make_tuple(44100, 440, 440, 4400), |
| std::make_tuple(44100, 440, 128, 4196), |
| std::make_tuple(44100, 440, 440, 4196), |
| std::make_tuple(44100, 440, 0, 0), |
| std::make_tuple(44100, 256, 128, 512), |
| std::make_tuple(44100, 256, 0, 0)) |
| #elif defined(OS_MACOSX) || defined(USE_CRAS) |
| // These values are constant on Mac and ChromeOS, regardless of device. |
| testing::Values(std::make_tuple(44100, |
| 256, |
| limits::kMinAudioBufferSize, |
| limits::kMaxAudioBufferSize)) |
| #else |
| testing::Values(std::make_tuple(44100, 256, 0, 0), |
| std::make_tuple(44100, 440, 0, 0)) |
| #endif |
| ); |
| } // namespace media |