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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QFFMPEGTIMECONTROLLER_P_H
#define QFFMPEGTIMECONTROLLER_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include "qglobal.h"
#include <chrono>
#include <optional>
QT_BEGIN_NAMESPACE
namespace QFFmpeg {
class TimeController
{
using TrackTime = std::chrono::microseconds;
public:
using Clock = std::chrono::steady_clock;
using TimePoint = Clock::time_point;
using PlaybackRate = float;
TimeController();
PlaybackRate playbackRate() const;
void setPlaybackRate(PlaybackRate playbackRate);
void sync(qint64 trackPos = 0);
void sync(const TimePoint &tp, qint64 pos);
void syncSoft(const TimePoint &tp, qint64 pos,
const Clock::duration &fixingTime = std::chrono::seconds(4));
qint64 currentPosition(const Clock::duration &offset = Clock::duration{ 0 }) const;
void setPaused(bool paused);
qint64 positionFromTime(TimePoint tp, bool ignorePause = false) const;
TimePoint timeFromPosition(qint64 pos, bool ignorePause = false) const;
private:
struct SoftSyncData
{
TimePoint srcTimePoint;
TrackTime srcPosition;
TimePoint dstTimePoint;
TrackTime srcPosOffest;
TrackTime dstPosition;
PlaybackRate internalRate = 1;
};
SoftSyncData makeSoftSyncData(const TimePoint &srcTp, const TrackTime &srcPos,
const TimePoint &dstTp) const;
TrackTime positionFromTimeInternal(const TimePoint &tp) const;
TimePoint timeFromPositionInternal(const TrackTime &pos) const;
void scrollTimeTillNow();
template<typename T>
static Clock::duration toClockTime(const T &t);
template<typename T>
static TrackTime toTrackTime(const T &t);
private:
bool m_paused = true;
PlaybackRate m_playbackRate = 1;
TrackTime m_position;
TimePoint m_timePoint = {};
std::optional<SoftSyncData> m_softSyncData;
};
} // namespace QFFmpeg
QT_END_NAMESPACE
#endif // QFFMPEGTIMECONTROLLER_P_H
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