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/*
* Copyright 2003-2020 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_FFMPEG_TIME_HXX
#define MPD_FFMPEG_TIME_HXX
#include "Chrono.hxx"
#include "util/Compiler.h"
extern "C" {
#include <libavutil/avutil.h>
#include <libavutil/mathematics.h>
}
#include <cassert>
#include <cstdint>
/* redefine AV_TIME_BASE_Q because libavutil's macro definition is a
compound literal, which is illegal in C++ */
#ifdef AV_TIME_BASE_Q
#undef AV_TIME_BASE_Q
#endif
static constexpr AVRational AV_TIME_BASE_Q{1, AV_TIME_BASE};
/**
* Convert a FFmpeg time stamp to a floating point value (in seconds).
*/
gcc_const
static inline FloatDuration
FfmpegTimeToDouble(int64_t t, const AVRational time_base) noexcept
{
assert(t != (int64_t)AV_NOPTS_VALUE);
return FloatDuration(av_rescale_q(t, time_base, {1, 1024}))
/ 1024;
}
/**
* Convert a std::ratio to a #AVRational.
*/
template<typename Ratio>
constexpr AVRational
RatioToAVRational()
{
return { Ratio::num, Ratio::den };
}
/**
* Convert a FFmpeg time stamp to a #SongTime.
*/
gcc_const
static inline SongTime
FromFfmpegTime(int64_t t, const AVRational time_base) noexcept
{
assert(t != (int64_t)AV_NOPTS_VALUE);
return SongTime::FromMS(av_rescale_q(t, time_base,
{1, 1000}));
}
/**
* Convert a FFmpeg time stamp to a #SignedSongTime.
*/
gcc_const
static inline SignedSongTime
FromFfmpegTimeChecked(int64_t t, const AVRational time_base) noexcept
{
return t != (int64_t)AV_NOPTS_VALUE
? SignedSongTime(FromFfmpegTime(t, time_base))
: SignedSongTime::Negative();
}
/**
* Convert a #SongTime to a FFmpeg time stamp with the given base.
*/
gcc_const
static inline int64_t
ToFfmpegTime(SongTime t, const AVRational time_base) noexcept
{
return av_rescale_q(t.count(),
RatioToAVRational<SongTime::period>(),
time_base);
}
/**
* Replace #AV_NOPTS_VALUE with the given fallback.
*/
constexpr int64_t
FfmpegTimestampFallback(int64_t t, int64_t fallback)
{
return gcc_likely(t != int64_t(AV_NOPTS_VALUE))
? t
: fallback;
}
#endif
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