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