#include "VideoPlayoutScheduler.h"

void VideoPlayoutScheduler::Configure(int64_t frameDuration, int64_t timeScale)
{
	mFrameDuration = frameDuration;
	mTimeScale = timeScale;
	Reset();
}

void VideoPlayoutScheduler::Reset()
{
	mScheduledFrameIndex = 0;
}

VideoIOScheduleTime VideoPlayoutScheduler::NextScheduleTime()
{
	VideoIOScheduleTime time;
	time.streamTime = static_cast<int64_t>(mScheduledFrameIndex) * mFrameDuration;
	time.duration = mFrameDuration;
	time.timeScale = mTimeScale;
	time.frameIndex = mScheduledFrameIndex;
	++mScheduledFrameIndex;
	return time;
}

void VideoPlayoutScheduler::AccountForCompletionResult(VideoIOCompletionResult result)
{
	if (result == VideoIOCompletionResult::DisplayedLate || result == VideoIOCompletionResult::Dropped)
		mScheduledFrameIndex += 2;
}

double VideoPlayoutScheduler::FrameBudgetMilliseconds() const
{
	return mTimeScale != 0
		? (static_cast<double>(mFrameDuration) * 1000.0) / static_cast<double>(mTimeScale)
		: 0.0;
}