119 lines
3.9 KiB
C++
119 lines
3.9 KiB
C++
// Copyright 2023 Google LLC
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include <cmath>
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#include <random>
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#include "gtest/gtest.h"
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#include "keyboard_report_util.hpp"
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#include "test_common.hpp"
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namespace {
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class AudioTest : public TestFixture {
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public:
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uint16_t infer_tempo() {
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return audio_ms_to_duration(1875) / 2;
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}
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};
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TEST_F(AudioTest, OnOffToggle) {
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audio_on();
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EXPECT_TRUE(audio_is_on());
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audio_off();
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EXPECT_FALSE(audio_is_on());
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audio_toggle();
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EXPECT_TRUE(audio_is_on());
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audio_toggle();
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EXPECT_FALSE(audio_is_on());
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}
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TEST_F(AudioTest, ChangeTempo) {
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for (int tempo = 50; tempo <= 250; tempo += 50) {
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audio_set_tempo(tempo);
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EXPECT_EQ(infer_tempo(), tempo);
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}
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audio_set_tempo(10);
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audio_increase_tempo(25);
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EXPECT_EQ(infer_tempo(), 35);
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audio_decrease_tempo(4);
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EXPECT_EQ(infer_tempo(), 31);
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audio_increase_tempo(250);
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EXPECT_EQ(infer_tempo(), 255);
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audio_set_tempo(9);
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EXPECT_EQ(infer_tempo(), 10);
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audio_decrease_tempo(100);
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EXPECT_EQ(infer_tempo(), 10);
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}
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TEST_F(AudioTest, BpmConversion) {
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const int tol = 1;
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audio_set_tempo(120);
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// At 120 bpm, there are 2 beats per second, and a whole note is 500 ms.
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EXPECT_NEAR(audio_duration_to_ms(64 /* whole note */), 500, tol);
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EXPECT_NEAR(audio_ms_to_duration(500), 64, tol);
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EXPECT_EQ(audio_duration_to_ms(0), 0);
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EXPECT_EQ(audio_ms_to_duration(0), 0);
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audio_set_tempo(10);
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// At 10 bpm, UINT16_MAX ms corresponds to 699/64 beats and is the longest
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// duration that can be converted without overflow.
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EXPECT_NEAR(audio_ms_to_duration(UINT16_MAX), 699, tol);
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EXPECT_NEAR(audio_duration_to_ms(699), 65531, tol);
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audio_set_tempo(255);
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// At 255 bpm, UINT16_MAX ms corresponds to 17825/64 beats and is the longest
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// duration that can be converted without overflow.
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EXPECT_NEAR(audio_ms_to_duration(UINT16_MAX), 17825, tol);
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EXPECT_NEAR(audio_duration_to_ms(17825), 65533, tol);
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std::mt19937 rng(0 /*seed*/);
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std::uniform_int_distribution<int> dist_tempo(10, 255);
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std::uniform_int_distribution<int> dist_ms(0, UINT16_MAX);
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// Test bpm <-> ms conversions for random tempos and durations.
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for (int trial = 0; trial < 50; ++trial) {
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const int tempo = dist_tempo(rng);
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const int duration_ms = dist_ms(rng);
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SCOPED_TRACE("tempo " + testing::PrintToString(tempo) + ", duration " + testing::PrintToString(duration_ms) + " ms");
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audio_set_tempo(tempo);
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int duration_bpm = std::round((64.0f / (60.0f * 1000.0f)) * duration_ms * tempo);
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ASSERT_NEAR(audio_ms_to_duration(duration_ms), duration_bpm, tol);
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int roundtrip_ms = std::round((60.0f * 1000.0f / 64.0f) * duration_bpm / tempo);
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// Because of round-off error, duration_ms and roundtrip_ms may differ by
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// about (60 * 1000 / 64) / tempo.
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int roundtrip_tol = tol * (60.0f * 1000.0f / 64.0f) / tempo;
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ASSERT_NEAR(roundtrip_ms, duration_ms, roundtrip_tol);
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// Only test converting back to ms if the result would be in uint16_t range.
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if (roundtrip_ms <= UINT16_MAX) {
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ASSERT_NEAR(audio_duration_to_ms(duration_bpm), roundtrip_ms, tol);
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}
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}
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}
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} // namespace
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