double rel_time_to_abs(struct MPContext *mpctx, struct m_rel_time t)
{
double length = get_time_length(mpctx);
double start = get_start_time(mpctx);
switch (t.type) {
case REL_TIME_ABSOLUTE:
return t.pos;
case REL_TIME_RELATIVE:
if (t.pos >= 0) {
return start + t.pos;
} else {
if (length != 0)
return MPMAX(start + length + t.pos, 0.0);
}
break;
case REL_TIME_PERCENT:
if (length != 0)
return start + length * (t.pos / 100.0);
break;
case REL_TIME_CHAPTER:
if (chapter_start_time(mpctx, t.pos) != MP_NOPTS_VALUE)
return chapter_start_time(mpctx, t.pos);
break;
}
return MP_NOPTS_VALUE;
}
double get_play_end_pts(struct MPContext *mpctx)
{
struct MPOpts *opts = mpctx->opts;
double end = MP_NOPTS_VALUE;
if (opts->play_end.type) {
end = rel_time_to_abs(mpctx, opts->play_end);
} else if (opts->play_length.type) {
double start = rel_time_to_abs(mpctx, opts->play_start);
if (start == MP_NOPTS_VALUE)
start = 0;
double length = rel_time_to_abs(mpctx, opts->play_length);
if (length != MP_NOPTS_VALUE)
end = start + length;
}
if (opts->chapterrange[1] > 0) {
double cend = chapter_start_time(mpctx, opts->chapterrange[1]);
if (cend != MP_NOPTS_VALUE && (end == MP_NOPTS_VALUE || cend < end))
end = cend;
}
if (mpctx->ab_loop_clip && opts->ab_loop[1] != MP_NOPTS_VALUE &&
opts->ab_loop[1] > opts->ab_loop[0])
{
if (end == MP_NOPTS_VALUE || end > opts->ab_loop[1])
end = opts->ab_loop[1];
}
return end;
}
double get_play_end_pts(struct MPContext *mpctx)
{
struct MPOpts *opts = mpctx->opts;
double end = MP_NOPTS_VALUE;
if (opts->play_end.type) {
end = rel_time_to_abs(mpctx, opts->play_end);
}
if (opts->play_length.type) {
double start = get_play_start_pts(mpctx);
if (start == MP_NOPTS_VALUE)
start = 0;
double length = rel_time_to_abs(mpctx, opts->play_length);
if (length != MP_NOPTS_VALUE && (end == MP_NOPTS_VALUE || start + length < end))
end = start + length;
}
if (opts->chapterrange[1] > 0) {
double cend = chapter_start_time(mpctx, opts->chapterrange[1]);
if (cend != MP_NOPTS_VALUE && (end == MP_NOPTS_VALUE || cend < end))
end = cend;
}
// even though MP_NOPTS_VALUE is currently negative
// it doesn't necessarily have to remain that way
double ab_loop_start_time = get_ab_loop_start_time(mpctx);
if (mpctx->ab_loop_clip && opts->ab_loop[1] != MP_NOPTS_VALUE &&
(ab_loop_start_time == MP_NOPTS_VALUE || opts->ab_loop[1] > ab_loop_start_time))
{
if (end == MP_NOPTS_VALUE || end > opts->ab_loop[1])
end = opts->ab_loop[1];
}
return end;
}
double rel_time_to_abs(struct MPContext *mpctx, struct m_rel_time t)
{
double length = get_time_length(mpctx);
// declaration up here because of C grammar quirk
double chapter_start_pts;
switch (t.type) {
case REL_TIME_ABSOLUTE:
return t.pos;
case REL_TIME_RELATIVE:
if (t.pos >= 0) {
return t.pos;
} else {
if (length >= 0)
return MPMAX(length + t.pos, 0.0);
}
break;
case REL_TIME_PERCENT:
if (length >= 0)
return length * (t.pos / 100.0);
break;
case REL_TIME_CHAPTER:
chapter_start_pts = chapter_start_time(mpctx, t.pos);
if (chapter_start_pts != MP_NOPTS_VALUE){
/*
* rel_time_to_abs always returns rebased timetamps,
* even with --rebase-start-time=no. (See the above two
* cases.) chapter_start_time values are not rebased without
* --rebase-start-time=yes, so we need to rebase them
* here to be consistent with the rest of rel_time_to_abs.
*/
if (mpctx->demuxer && !mpctx->opts->rebase_start_time){
chapter_start_pts -= mpctx->demuxer->start_time;
}
return chapter_start_pts;
}
break;
}
return MP_NOPTS_VALUE;
}
/**
* Get the rebased PTS for which playback should start.
* The order of priority is as follows:
* 1. --start, if set.
* 2. The start chapter, if set.
* 3. MP_NOPTS_VALUE.
* If unspecified, return MP_NOPTS_VALUE.
* Does not return zero unless the start time is explicitly set to zero.
*/
double get_play_start_pts(struct MPContext *mpctx)
{
struct MPOpts *opts = mpctx->opts;
double play_start_pts = rel_time_to_abs(mpctx, opts->play_start);
if (play_start_pts == MP_NOPTS_VALUE && opts->chapterrange[0] > 0) {
double chapter_start_pts = chapter_start_time(mpctx, opts->chapterrange[0] - 1);
if (chapter_start_pts != MP_NOPTS_VALUE) {
/*
* get_play_start_pts always returns rebased timetamps,
* even with --rebase-start-time=no. chapter_start_time
* values are not rebased without --rebase-start-time=yes,
* so we need to rebase them here to be consistent with
* the rest of get_play_start_pts.
*/
if (mpctx->demuxer && !mpctx->opts->rebase_start_time){
chapter_start_pts -= mpctx->demuxer->start_time;
}
play_start_pts = chapter_start_pts;
}
}
return play_start_pts;
}