test_audio.cpp (3949B)
1 // Copyright 2023 Google LLC 2 // 3 // This program is free software: you can redistribute it and/or modify 4 // it under the terms of the GNU General Public License as published by 5 // the Free Software Foundation, either version 2 of the License, or 6 // (at your option) any later version. 7 // 8 // This program is distributed in the hope that it will be useful, 9 // but WITHOUT ANY WARRANTY; without even the implied warranty of 10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 // GNU General Public License for more details. 12 // 13 // You should have received a copy of the GNU General Public License 14 // along with this program. If not, see <http://www.gnu.org/licenses/>. 15 16 #include <cmath> 17 #include <random> 18 19 #include "gtest/gtest.h" 20 #include "keyboard_report_util.hpp" 21 #include "test_common.hpp" 22 23 namespace { 24 25 class AudioTest : public TestFixture { 26 public: 27 uint16_t infer_tempo() { 28 return audio_ms_to_duration(1875) / 2; 29 } 30 }; 31 32 TEST_F(AudioTest, OnOffToggle) { 33 audio_on(); 34 EXPECT_TRUE(audio_is_on()); 35 36 audio_off(); 37 EXPECT_FALSE(audio_is_on()); 38 39 audio_toggle(); 40 EXPECT_TRUE(audio_is_on()); 41 42 audio_toggle(); 43 EXPECT_FALSE(audio_is_on()); 44 } 45 46 TEST_F(AudioTest, ChangeTempo) { 47 for (int tempo = 50; tempo <= 250; tempo += 50) { 48 audio_set_tempo(tempo); 49 EXPECT_EQ(infer_tempo(), tempo); 50 } 51 52 audio_set_tempo(10); 53 audio_increase_tempo(25); 54 EXPECT_EQ(infer_tempo(), 35); 55 56 audio_decrease_tempo(4); 57 EXPECT_EQ(infer_tempo(), 31); 58 59 audio_increase_tempo(250); 60 EXPECT_EQ(infer_tempo(), 255); 61 62 audio_set_tempo(9); 63 EXPECT_EQ(infer_tempo(), 10); 64 65 audio_decrease_tempo(100); 66 EXPECT_EQ(infer_tempo(), 10); 67 } 68 69 TEST_F(AudioTest, BpmConversion) { 70 const int tol = 1; 71 72 audio_set_tempo(120); 73 // At 120 bpm, there are 2 beats per second, and a whole note is 500 ms. 74 EXPECT_NEAR(audio_duration_to_ms(64 /* whole note */), 500, tol); 75 EXPECT_NEAR(audio_ms_to_duration(500), 64, tol); 76 EXPECT_EQ(audio_duration_to_ms(0), 0); 77 EXPECT_EQ(audio_ms_to_duration(0), 0); 78 79 audio_set_tempo(10); 80 // At 10 bpm, UINT16_MAX ms corresponds to 699/64 beats and is the longest 81 // duration that can be converted without overflow. 82 EXPECT_NEAR(audio_ms_to_duration(UINT16_MAX), 699, tol); 83 EXPECT_NEAR(audio_duration_to_ms(699), 65531, tol); 84 85 audio_set_tempo(255); 86 // At 255 bpm, UINT16_MAX ms corresponds to 17825/64 beats and is the longest 87 // duration that can be converted without overflow. 88 EXPECT_NEAR(audio_ms_to_duration(UINT16_MAX), 17825, tol); 89 EXPECT_NEAR(audio_duration_to_ms(17825), 65533, tol); 90 91 std::mt19937 rng(0 /*seed*/); 92 std::uniform_int_distribution<int> dist_tempo(10, 255); 93 std::uniform_int_distribution<int> dist_ms(0, UINT16_MAX); 94 95 // Test bpm <-> ms conversions for random tempos and durations. 96 for (int trial = 0; trial < 50; ++trial) { 97 const int tempo = dist_tempo(rng); 98 const int duration_ms = dist_ms(rng); 99 SCOPED_TRACE("tempo " + testing::PrintToString(tempo) + ", duration " + testing::PrintToString(duration_ms) + " ms"); 100 101 audio_set_tempo(tempo); 102 int duration_bpm = std::round((64.0f / (60.0f * 1000.0f)) * duration_ms * tempo); 103 ASSERT_NEAR(audio_ms_to_duration(duration_ms), duration_bpm, tol); 104 105 int roundtrip_ms = std::round((60.0f * 1000.0f / 64.0f) * duration_bpm / tempo); 106 // Because of round-off error, duration_ms and roundtrip_ms may differ by 107 // about (60 * 1000 / 64) / tempo. 108 int roundtrip_tol = tol * (60.0f * 1000.0f / 64.0f) / tempo; 109 ASSERT_NEAR(roundtrip_ms, duration_ms, roundtrip_tol); 110 111 // Only test converting back to ms if the result would be in uint16_t range. 112 if (roundtrip_ms <= UINT16_MAX) { 113 ASSERT_NEAR(audio_duration_to_ms(duration_bpm), roundtrip_ms, tol); 114 } 115 } 116 } 117 118 } // namespace