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* ssa-retime : implement 'drift' mode

master
Alex 'AdUser' Z 6 years ago
parent
commit
64d5bdf724
  1. 42
      bin/ssa-retime

42
bin/ssa-retime

@ -8,6 +8,7 @@ use utf8;
use Getopt::Long;
use Subtitle::Format::SSA;
use Subtitle::TimePoint;
use Subtitle::Utils ':timing';
my @points;
@ -141,12 +142,45 @@ if ($mode eq 'framerate') {
} elsif ($mode eq 'drift') {
if ($points[0]->time >= 0.2) {
# add starting point
my $p = Subtitle::TimePoint->new;
$p->parse('0/0');
my $p = Subtitle::TimePoint->new(time => 0.0, shift => 0.0);
unshift @points, $p;
}
# add endpoint
...;
# add endpoint, if needed
my $maxtime = 0.0;
foreach my $e (@{ $ssa->events }) {
next unless $e->t_end > $maxtime;
$maxtime = $e->t_end;
}
if ($maxtime > $points[-1]->time) {
my $p = Subtitle::TimePoint->new(time => $maxtime, shift => 0.0);
push @points, $p;
}
# dump points list
print "Final points list:\n";
foreach my $p (@points) {
printf "- %d:%02d:%02d.%03d ~ %.3f\n", make_timing($p->time), $p->shift;
}
print "-" x 30, "\n";
# real retime
$ssa->sort_events;
foreach my $e (@{ $ssa->events }) {
while ($points[1]->time <= $e->t_start) {
printf "move timepoints: %d:%02d:%02d.%03d (endpoint) <= %d:%02d:%02d.%03d (event)\n",
make_timing($points[1]->time), make_timing($e->t_start);
shift @points;
}
my ($a, $b) = @points;
my $pct = ($e->t_start - $a->time) / ($b->time - $a->time);
my $abs = ($a->shift > $b->shift)
? ($a->shift - $b->shift)
: ($b->shift - $a->shift);
my $mod = ($a->shift > $b->shift)
? ($a->shift - $abs * $pct)
: ($a->shift + $abs * $pct);
$e->t_start($e->t_start + $mod);
$e->t_end ($e->t_end + $mod);
printf "- %d:%02d:%02d.%03d ~ %.3f\n", make_timing($e->t_start), $mod;
}
}
if ($opts{outfile}) {

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