videoplayer/backend/clock.h

0001 /*
0002     SPDX-FileCopyrightText: 2003 Fabrice Bellard
0003     SPDX-FileCopyrightText: 2020-2022 Mladen Milinkovic <max@smoothware.net>
0004
0005     SPDX-License-Identifier: GPL-2.0-or-later
0006 */
0007
0008 #ifndef CLOCK_H
0009 #define CLOCK_H
0010
0011 // no AV correction is done if too big error
0012 #define AV_NOSYNC_THRESHOLD 10.0
0013
0014 namespace SubtitleComposer {
0015 class PacketQueue;
0016
0017 class Clock
0018 {
0019 public:
0020     Clock();
0021
0022     double get() const;
0023     void setAt(double pts, int serial, double time);
0024     void set(double pts, int serial);
0025     void setSpeed(double speed);
0026     void init(const PacketQueue *queue);
0027     void syncTo(Clock *other);
0028
0029     inline double pts() const { return m_pts; }
0030     inline double lastUpdated() const { return m_lastUpdated; }
0031     inline double speed() const { return m_speed; }
0032     inline int serial() const { return m_serial; }
0033     inline int paused() const { return m_paused; }
0034     inline void pause(bool pause) { m_paused = pause; }
0035
0036 private:
0037     double m_pts; // clock base
0038     double m_ptsDrift; // clock base minus time at which we updated the clock
0039     double m_lastUpdated;
0040     double m_speed;
0041     int m_serial; // clock is based on a packet with this serial
0042     bool m_paused;
0043     const int *m_queueSerial; // pointer to the current packet queue serial, used for obsolete clock detection
0044 };
0045 }
0046
0047 #endif // CLOCK_H