VideoPlayer/av_clock.cpp at main · gyl30/VideoPlayer · GitHub

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#include "av_clock.h"
extern "C"
{
#include <libavutil/time.h>
}

av_clock::av_clock() { update_time(); }

void av_clock::set(double p, int serial)
{
    pts_.store(p);
    serial_.store(serial);
    update_time();
}

double av_clock::get() const
{
    if (paused_.load())
    {
        return pts_at_pause_;
    }
    auto now = static_cast<double>(av_gettime_relative());
    const double time_elapsed = (now / 1000000.0) - last_updated_.load();
    return pts_.load() + (time_elapsed * rate_.load());
}

int av_clock::serial() const { return serial_.load(); }

void av_clock::set_rate(double rate)
{
    if (rate <= 0.0)
    {
        return;
    }

    const double current = get();
    pts_.store(current);
    rate_.store(rate);
    update_time();
}

double av_clock::rate() const { return rate_.load(); }

void av_clock::pause()
{
    pts_at_pause_ = get();
    paused_.store(true);
}

void av_clock::resume()
{
    pts_.store(pts_at_pause_);
    update_time();
    paused_.store(false);
}

void av_clock::update_time()
{
    auto now = static_cast<double>(av_gettime_relative());
    last_updated_.store(now / 1000000.0);
}