| 1 | // Copyright (C) 2021 The Qt Company Ltd. |
|---|
| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
|---|
| 3 | #ifndef QFFMPEGTIMECONTROLLER_P_H |
|---|
| 4 | #define QFFMPEGTIMECONTROLLER_P_H |
|---|
| 5 | |
|---|
| 6 | // |
|---|
| 7 | // W A R N I N G |
|---|
| 8 | // ------------- |
|---|
| 9 | // |
|---|
| 10 | // This file is not part of the Qt API. It exists purely as an |
|---|
| 11 | // implementation detail. This header file may change from version to |
|---|
| 12 | // version without notice, or even be removed. |
|---|
| 13 | // |
|---|
| 14 | // We mean it. |
|---|
| 15 | // |
|---|
| 16 | |
|---|
| 17 | #include "qglobal.h" |
|---|
| 18 | |
|---|
| 19 | #include <chrono> |
|---|
| 20 | #include <optional> |
|---|
| 21 | |
|---|
| 22 | QT_BEGIN_NAMESPACE |
|---|
| 23 | |
|---|
| 24 | namespace QFFmpeg { |
|---|
| 25 | |
|---|
| 26 | class TimeController |
|---|
| 27 | { |
|---|
| 28 | using TrackTime = std::chrono::microseconds; |
|---|
| 29 | |
|---|
| 30 | public: |
|---|
| 31 | using Clock = std::chrono::steady_clock; |
|---|
| 32 | using TimePoint = Clock::time_point; |
|---|
| 33 | using PlaybackRate = float; |
|---|
| 34 | |
|---|
| 35 | TimeController(); |
|---|
| 36 | |
|---|
| 37 | PlaybackRate playbackRate() const; |
|---|
| 38 | |
|---|
| 39 | void setPlaybackRate(PlaybackRate playbackRate); |
|---|
| 40 | |
|---|
| 41 | void sync(qint64 trackPos = 0); |
|---|
| 42 | |
|---|
| 43 | void sync(const TimePoint &tp, qint64 pos); |
|---|
| 44 | |
|---|
| 45 | void syncSoft(const TimePoint &tp, qint64 pos, |
|---|
| 46 | const Clock::duration &fixingTime = std::chrono::seconds(4)); |
|---|
| 47 | |
|---|
| 48 | qint64 currentPosition(const Clock::duration &offset = Clock::duration{ 0 }) const; |
|---|
| 49 | |
|---|
| 50 | void setPaused(bool paused); |
|---|
| 51 | |
|---|
| 52 | qint64 positionFromTime(TimePoint tp, bool ignorePause = false) const; |
|---|
| 53 | |
|---|
| 54 | TimePoint timeFromPosition(qint64 pos, bool ignorePause = false) const; |
|---|
| 55 | |
|---|
| 56 | private: |
|---|
| 57 | struct SoftSyncData |
|---|
| 58 | { |
|---|
| 59 | TimePoint srcTimePoint; |
|---|
| 60 | TrackTime srcPosition; |
|---|
| 61 | TimePoint dstTimePoint; |
|---|
| 62 | TrackTime srcPosOffest; |
|---|
| 63 | TrackTime dstPosition; |
|---|
| 64 | PlaybackRate internalRate = 1; |
|---|
| 65 | }; |
|---|
| 66 | |
|---|
| 67 | SoftSyncData makeSoftSyncData(const TimePoint &srcTp, const TrackTime &srcPos, |
|---|
| 68 | const TimePoint &dstTp) const; |
|---|
| 69 | |
|---|
| 70 | TrackTime positionFromTimeInternal(const TimePoint &tp) const; |
|---|
| 71 | |
|---|
| 72 | TimePoint timeFromPositionInternal(const TrackTime &pos) const; |
|---|
| 73 | |
|---|
| 74 | void scrollTimeTillNow(); |
|---|
| 75 | |
|---|
| 76 | template<typename T> |
|---|
| 77 | static Clock::duration toClockTime(const T &t); |
|---|
| 78 | |
|---|
| 79 | template<typename T> |
|---|
| 80 | static TrackTime toTrackTime(const T &t); |
|---|
| 81 | |
|---|
| 82 | private: |
|---|
| 83 | bool m_paused = true; |
|---|
| 84 | PlaybackRate m_playbackRate = 1; |
|---|
| 85 | TrackTime m_position; |
|---|
| 86 | TimePoint m_timePoint = {}; |
|---|
| 87 | std::optional<SoftSyncData> m_softSyncData; |
|---|
| 88 | }; |
|---|
| 89 | |
|---|
| 90 | } // namespace QFFmpeg |
|---|
| 91 | |
|---|
| 92 | QT_END_NAMESPACE |
|---|
| 93 | |
|---|
| 94 | #endif // QFFMPEGTIMECONTROLLER_P_H |
|---|
| 95 | |
|---|
