Decklink abstraction

tests/VideoPlayoutSchedulerTests.cpp

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+#include "VideoPlayoutScheduler.h"
+
+#include <cmath>
+#include <iostream>
+
+namespace
+{
+int gFailures = 0;
+
+void Expect(bool condition, const char* message)
+{
+	if (condition)
+		return;
+
+	std::cerr << "FAIL: " << message << "\n";
+	++gFailures;
+}
+
+void ExpectNear(double actual, double expected, double tolerance, const char* message)
+{
+	Expect(std::fabs(actual - expected) <= tolerance, message);
+}
+
+void TestScheduleAdvancesFromZero()
+{
+	VideoPlayoutScheduler scheduler;
+	scheduler.Configure(1001, 60000);
+
+	const VideoIOScheduleTime first = scheduler.NextScheduleTime();
+	const VideoIOScheduleTime second = scheduler.NextScheduleTime();
+	const VideoIOScheduleTime third = scheduler.NextScheduleTime();
+
+	Expect(first.streamTime == 0, "first frame starts at stream time zero");
+	Expect(first.duration == 1001, "duration is preserved");
+	Expect(first.timeScale == 60000, "time scale is preserved");
+	Expect(second.streamTime == 1001, "second frame advances by one duration");
+	Expect(third.streamTime == 2002, "third frame advances by two durations");
+}
+
+void TestLateAndDroppedSkipAhead()
+{
+	VideoPlayoutScheduler scheduler;
+	scheduler.Configure(1000, 50000);
+
+	(void)scheduler.NextScheduleTime();
+	scheduler.AccountForCompletionResult(VideoIOCompletionResult::DisplayedLate);
+	Expect(scheduler.NextScheduleTime().streamTime == 3000, "late completion preserves the existing two-frame skip policy");
+
+	scheduler.AccountForCompletionResult(VideoIOCompletionResult::Dropped);
+	Expect(scheduler.NextScheduleTime().streamTime == 6000, "dropped completion preserves the existing two-frame skip policy");
+}
+
+void TestFrameBudgets()
+{
+	VideoPlayoutScheduler scheduler;
+	scheduler.Configure(1000, 50000);
+	ExpectNear(scheduler.FrameBudgetMilliseconds(), 20.0, 0.0001, "50 fps budget");
+
+	scheduler.Configure(1001, 60000);
+	ExpectNear(scheduler.FrameBudgetMilliseconds(), 16.6833, 0.0001, "59.94 fps budget");
+
+	scheduler.Configure(1, 60);
+	ExpectNear(scheduler.FrameBudgetMilliseconds(), 16.6667, 0.0001, "60 fps budget");
+}
+}
+
+int main()
+{
+	TestScheduleAdvancesFromZero();
+	TestLateAndDroppedSkipAhead();
+	TestFrameBudgets();
+
+	if (gFailures != 0)
+	{
+		std::cerr << gFailures << " VideoPlayoutScheduler test failure(s).\n";
+		return 1;
+	}
+
+	std::cout << "VideoPlayoutScheduler tests passed.\n";
+	return 0;
+}