Implement audio sync foundations

2026-07-13 10:19:29 +08:00
parent 4d52267c4a
commit 08b1c6d562
21 changed files with 1094 additions and 18 deletions
@@ -0,0 +1,80 @@
+#include <gtest/gtest.h>
+
+#include <cmath>
+
+#include "audio/audiolevelmeter.h"
+#include "olive/core/render/audioparams.h"
+#include "olive/core/render/samplebuffer.h"
+#include "olive/core/render/sampleformat.h"
+
+extern "C" {
+#include <libavutil/channel_layout.h>
+}
+
+namespace {
+
+olive::core::AudioParams MakeStereoParams()
+{
+	return olive::core::AudioParams(48000, AV_CH_LAYOUT_STEREO,
+									olive::core::SampleFormat::F32P);
+}
+
+}
+
+TEST(AudioLevelMeter, Silence)
+{
+	olive::core::SampleBuffer samples(MakeStereoParams(), size_t(480));
+	samples.silence();
+
+	const olive::AudioLevelMeter::Stats stats =
+		olive::AudioLevelMeter::AnalyzeSampleBuffer(samples);
+
+	ASSERT_EQ(stats.channels.size(), 2);
+	EXPECT_TRUE(stats.silence);
+	EXPECT_DOUBLE_EQ(stats.max_peak_linear, 0.0);
+	EXPECT_DOUBLE_EQ(stats.channels.at(0).peak_linear, 0.0);
+	EXPECT_DOUBLE_EQ(stats.channels.at(0).rms_linear, 0.0);
+	EXPECT_DOUBLE_EQ(stats.integrated_lufs, -200.0);
+}
+
+TEST(AudioLevelMeter, ConstantSignal)
+{
+	olive::core::SampleBuffer samples(MakeStereoParams(), size_t(480));
+	for (int channel = 0; channel < samples.channel_count(); channel++) {
+		float *data = samples.data(channel);
+		for (size_t i = 0; i < samples.sample_count(); i++) {
+			data[i] = 0.5f;
+		}
+	}
+
+	const olive::AudioLevelMeter::Stats stats =
+		olive::AudioLevelMeter::AnalyzeSampleBuffer(samples);
+
+	ASSERT_EQ(stats.channels.size(), 2);
+	EXPECT_FALSE(stats.silence);
+	EXPECT_DOUBLE_EQ(stats.max_peak_linear, 0.5);
+	EXPECT_NEAR(stats.channels.at(0).peak_db, -6.0206, 0.0001);
+	EXPECT_NEAR(stats.channels.at(0).rms_linear, 0.5, 0.0001);
+	EXPECT_NEAR(stats.channels.at(0).vu_db, -6.0206, 0.0001);
+	EXPECT_NEAR(stats.integrated_lufs, -6.7116, 0.0001);
+}
+
+TEST(AudioLevelMeter, PerChannelPeaksAndRms)
+{
+	olive::core::SampleBuffer samples(MakeStereoParams(), size_t(4));
+	float left[] = { 0.0f, 0.25f, -0.5f, 1.0f };
+	float right[] = { 0.0f, -0.25f, 0.25f, -0.25f };
+	samples.set(0, left, 4);
+	samples.set(1, right, 4);
+
+	const olive::AudioLevelMeter::Stats stats =
+		olive::AudioLevelMeter::AnalyzeSampleBuffer(samples);
+
+	ASSERT_EQ(stats.channels.size(), 2);
+	EXPECT_DOUBLE_EQ(stats.channels.at(0).peak_linear, 1.0);
+	EXPECT_DOUBLE_EQ(stats.channels.at(1).peak_linear, 0.25);
+	EXPECT_NEAR(stats.channels.at(0).rms_linear,
+				std::sqrt((0.25 * 0.25 + 0.5 * 0.5 + 1.0) / 4.0), 0.0001);
+	EXPECT_NEAR(stats.channels.at(1).rms_linear,
+				std::sqrt((0.25 * 0.25 * 3.0) / 4.0), 0.0001);
+}