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| 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include <cmath> |
| 6 #include <cstdint> |
| 7 #include <limits> |
| 8 #include <string> |
| 9 #include <vector> |
| 10 |
| 11 #include "base/macros.h" |
| 12 #include "base/memory/ptr_util.h" |
| 13 #include "base/strings/stringprintf.h" |
| 14 #include "chromecast/media/cma/backend/alsa/post_processors/governor.h" |
| 15 #include "media/base/audio_bus.h" |
| 16 #include "testing/gtest/include/gtest/gtest.h" |
| 17 |
| 18 namespace chromecast { |
| 19 namespace media { |
| 20 |
| 21 namespace { |
| 22 |
| 23 const char* kConfigTemplate = |
| 24 R"config({"onset_volume": %f, "clamp_multiplier": %f})config"; |
| 25 |
| 26 const int kNumChannels = 2; |
| 27 const float kDefaultClamp = 0.6f; |
| 28 const int kNumFrames = 100; |
| 29 const float kFrequency = 1.0f / kNumFrames; |
| 30 const int kBytesPerSample = sizeof(int32_t); |
| 31 const int kSampleRate = 44100; |
| 32 |
| 33 std::string MakeConfigString(float onset_volume, float clamp_multiplier) { |
| 34 return base::StringPrintf(kConfigTemplate, onset_volume, clamp_multiplier); |
| 35 } |
| 36 |
| 37 // Frequency is in frames (frequency = frequency_in_hz / sample rate) |
| 38 std::unique_ptr<::media::AudioBus> GetSineData(size_t frames, float frequency) { |
| 39 auto data = ::media::AudioBus::Create(kNumChannels, frames); |
| 40 std::vector<int32_t> sine(frames * 2); |
| 41 for (size_t i = 0; i < frames; ++i) { |
| 42 sine[i * 2] = sin(static_cast<float>(i) * frequency * 2 * M_PI) * |
| 43 std::numeric_limits<int32_t>::max(); |
| 44 sine[i * 2 + 1] = cos(static_cast<float>(i) * frequency * 2 * M_PI) * |
| 45 std::numeric_limits<int32_t>::max(); |
| 46 } |
| 47 data->FromInterleaved(sine.data(), frames, kBytesPerSample); |
| 48 return data; |
| 49 } |
| 50 |
| 51 std::vector<float*> GetDataChannels(::media::AudioBus* audio) { |
| 52 std::vector<float*> data(kNumChannels); |
| 53 for (int i = 0; i < kNumChannels; ++i) { |
| 54 data[i] = audio->channel(i); |
| 55 } |
| 56 return data; |
| 57 } |
| 58 |
| 59 void ScaleData(const std::vector<float*>& data, int frames, float scale) { |
| 60 for (size_t ch = 0; ch < data.size(); ++ch) { |
| 61 for (int f = 0; f < frames; ++f) { |
| 62 data[ch][f] *= scale; |
| 63 } |
| 64 } |
| 65 } |
| 66 |
| 67 void CompareData(const std::vector<float*>& expected, |
| 68 const std::vector<float*>& actual, |
| 69 int frames) { |
| 70 ASSERT_EQ(expected.size(), actual.size()); |
| 71 for (size_t ch = 0; ch < expected.size(); ++ch) { |
| 72 for (int f = 0; f < frames; ++f) { |
| 73 EXPECT_FLOAT_EQ(expected[ch][f], actual[ch][f]) |
| 74 << "ch: " << ch << " f: " << f; |
| 75 } |
| 76 } |
| 77 } |
| 78 |
| 79 } // namespace |
| 80 |
| 81 class GovernorTest : public ::testing::TestWithParam<float> { |
| 82 protected: |
| 83 GovernorTest() = default; |
| 84 ~GovernorTest() = default; |
| 85 void SetUp() override { |
| 86 clamp_ = kDefaultClamp; |
| 87 onset_volume_ = GetParam(); |
| 88 std::string config = MakeConfigString(onset_volume_, clamp_); |
| 89 governor_ = base::MakeUnique<Governor>(config, kNumChannels); |
| 90 governor_->SetSlewTimeMsForTest(0); |
| 91 governor_->SetSampleRate(kSampleRate); |
| 92 |
| 93 data_bus_ = GetSineData(kNumFrames, kFrequency); |
| 94 expected_bus_ = GetSineData(kNumFrames, kFrequency); |
| 95 data_ = GetDataChannels(data_bus_.get()); |
| 96 expected_ = GetDataChannels(expected_bus_.get()); |
| 97 } |
| 98 |
| 99 void CompareBuffers() { CompareData(expected_, data_, kNumFrames); } |
| 100 |
| 101 void ProcessFrames(float volume) { |
| 102 EXPECT_EQ(governor_->ProcessFrames(data_, kNumFrames, volume), 0); |
| 103 } |
| 104 |
| 105 float clamp_; |
| 106 float onset_volume_; |
| 107 std::unique_ptr<Governor> governor_; |
| 108 std::unique_ptr<::media::AudioBus> data_bus_; |
| 109 std::unique_ptr<::media::AudioBus> expected_bus_; |
| 110 std::vector<float*> data_; |
| 111 std::vector<float*> expected_; |
| 112 |
| 113 private: |
| 114 DISALLOW_COPY_AND_ASSIGN(GovernorTest); |
| 115 }; |
| 116 |
| 117 TEST_P(GovernorTest, ZeroVolume) { |
| 118 ProcessFrames(0.0f); |
| 119 if (onset_volume_ <= 0.0f) { |
| 120 ScaleData(expected_, kNumFrames, clamp_); |
| 121 } |
| 122 CompareBuffers(); |
| 123 } |
| 124 |
| 125 TEST_P(GovernorTest, EpsilonBelowOnset) { |
| 126 float volume = onset_volume_ - std::numeric_limits<float>::epsilon(); |
| 127 ProcessFrames(volume); |
| 128 CompareBuffers(); |
| 129 } |
| 130 |
| 131 TEST_P(GovernorTest, EpsilonAboveOnset) { |
| 132 float volume = onset_volume_ + std::numeric_limits<float>::epsilon(); |
| 133 ProcessFrames(volume); |
| 134 ScaleData(expected_, kNumFrames, clamp_); |
| 135 CompareBuffers(); |
| 136 } |
| 137 |
| 138 TEST_P(GovernorTest, MaxVolume) { |
| 139 ProcessFrames(1.0); |
| 140 if (onset_volume_ <= 1.0) { |
| 141 ScaleData(expected_, kNumFrames, clamp_); |
| 142 } |
| 143 CompareBuffers(); |
| 144 } |
| 145 |
| 146 INSTANTIATE_TEST_CASE_P(GovernorClampVolumeTest, |
| 147 GovernorTest, |
| 148 ::testing::Values(0.0f, 0.1f, 0.5f, 0.9f, 1.0f, 1.1f)); |
| 149 |
| 150 } // namespace media |
| 151 } // namespace chromecast |
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