/*
 * Olive Community Edition - Non-Linear Video Editor
 * Copyright (C) 2025 Olive CE Team
 *
 * 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 3 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 "viewerplaybacktimer.h"

#include <QDateTime>
#include <QtMath>

namespace olive
{

void ViewerPlaybackTimer::Start(const int64_t &start_timestamp,
								const int &playback_speed,
								const double &timebase)
{
	start_msec_ = QDateTime::currentMSecsSinceEpoch();
	start_timestamp_ = start_timestamp;
	playback_speed_ = playback_speed;
	timebase_ = timebase * 1000;
}

int64_t ViewerPlaybackTimer::GetTimestampNow() const
{
	int64_t real_time = QDateTime::currentMSecsSinceEpoch() - start_msec_;

	int64_t frames_since_start =
		qFloor(static_cast<double>(real_time) / (timebase_));

	return start_timestamp_ + frames_since_start * playback_speed_;
}

}