PlaybackTime.hpp

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#pragma once
#include <Media/Libav.hpp>
 
#if SCORE_HAS_LIBAV
extern "C" {
#include <libavformat/avformat.h>
#include <libavutil/mathematics.h>
}
 
#include <ossia/detail/flicks.hpp>
 
#include <algorithm>
 
namespace Video
{
 
inline int64_t playbackStartPts(const AVFormatContext& fmt, const AVStream& st) noexcept
{
  if(fmt.start_time != AV_NOPTS_VALUE && fmt.start_time > 0)
    return av_rescale_q_rnd(
        fmt.start_time, AV_TIME_BASE_Q, st.time_base,
        AVRounding(AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX));
  if(fmt.start_time == AV_NOPTS_VALUE && st.start_time != AV_NOPTS_VALUE)
    return std::max<int64_t>(st.start_time, 0);
  return 0;
}
 
inline constexpr AVRational flicks_time_base{1, int(ossia::flicks_per_second<int64_t>)};
 
inline int64_t flicksToPts(int64_t flicks, AVRational tb, int64_t start) noexcept
{
  constexpr int64_t slack = ossia::flicks_per_second<int64_t> / 1'000'000;
  return av_rescale_q_rnd(
             flicks + slack, flicks_time_base, tb,
             AVRounding(AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX))
         + start;
}
 
inline int64_t ptsToFlicks(int64_t pts, AVRational tb, int64_t start) noexcept
{
  return av_rescale_q(pts - start, tb, flicks_time_base);
}
 
}
#endif