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Comparing Linux-DVB/DVB.pm (file contents):
Revision 1.7 by root, Mon Apr 11 21:14:12 2005 UTC vs.
Revision 1.9 by root, Tue Apr 12 01:03:25 2005 UTC

… …
30package Linux::DVB; 30package Linux::DVB;
31 31
32use Fcntl (); 32use Fcntl ();
33 33
34BEGIN { 34BEGIN {
35 $VERSION = '0.3'; 35 $VERSION = '0.4';
36 @ISA = qw(Exporter); 36 @ISA = qw(Exporter);
37 37
38 require XSLoader; 38 require XSLoader;
39 XSLoader::load __PACKAGE__, $VERSION; 39 XSLoader::load __PACKAGE__, $VERSION;
40 40
… …
448 0x2 => 'unpublished', 448 0x2 => 'unpublished',
449 0x3 => 'live broadcast', 449 0x3 => 'live broadcast',
450 }, 450 },
451); 451);
452 452
453=item ($sec,$min,$hour) = Linux::DVB::Decode::time $hms
454
455=item ($mday,$mon,$year) = Linux::DVB::Decode::date $mjd
456
453=item ($sec,$min,$hour,$mday,$mon,$year) = Linux::DVB::Decode::time $mjd, $time 457=item ($sec,$min,$hour,$mday,$mon,$year) = Linux::DVB::Decode::datetime $mjd, $hms
458
459=item $sec = Linux::DVB::Decode::time_linear $hms
460
461=item $sec = Linux::DVB::Decode::datetime_linear $mjd, $hms
454 462
455Break down a "DVB time" (modified julian date + bcd encoded seconds) into 463Break down a "DVB time" (modified julian date + bcd encoded seconds) into
456it's components in UTC (i.e. use Time::Local::timegm to convert to UNIX 464it's components (non-C<_linear>) or into a seconds count (C<_linear>
457time). 465variants) since the epoch (C<datetime_linear>) or the start of the day
466(C<time_linear>).
458 467
459=cut 468The format of the returns value of the date and datetime functions is
469I<not> compatible with C<Time::Local>. Use the C<_linear> functions
470instead.
460 471
472Example:
473
474 my $time = Linux::DVB::Decode::datetime_linear $mjd, $hms
475 printf "Starts at %s\n",
476 POSIX::strftime "%Y-%m-%d %H:%M:%S",
477 localtime $time;
478
479=cut
480
461sub time($$) { 481sub time($) {
462 my ($mjd, $time) = @_; 482 my ($time) = @_;
483
484 # Time is in UTC, 24 bit, every nibble one digit in BCD from right to left
485 my $hour = sprintf "%02x", ($time >> 16) & 0xFF;
486 my $minute = sprintf "%02x", ($time >> 8) & 0xFF;
487 my $second = sprintf "%02x", ($time ) & 0xFF;
488
489 ($second, $minute, $hour)
490}
491
492sub date($) {
493 my ($mjd) = @_;
463 494
464 # Date is given in Modified Julian Date 495 # Date is given in Modified Julian Date
465 # Decoding routines taken from ANNEX C, ETSI EN 300 468 (DVB SI) 496 # Decoding routines taken from ANNEX C, ETSI EN 300 468 (DVB SI)
466 my $y_ = int ($mjd - 15078.2) / 365.25; 497 my $y_ = int (($mjd - 15078.2) / 365.25);
467 my $m_ = int (($mjd - 14956.1 - int ($y_ * 365.25)) / 30.6001); 498 my $m_ = int (($mjd - 14956.1 - int ($y_ * 365.25)) / 30.6001);
468 my $day = $mjd - 14956 - int ($y_ * 365.25) - int ($m_ * 30.6001); 499 my $day = $mjd - 14956 - int ($y_ * 365.25) - int ($m_ * 30.6001);
469 my $k = $m_ == 14 or $m_ == 15 ? 1 : 0; 500 my $k = $m_ == 14 or $m_ == 15 ? 1 : 0;
470 my $year = $y_ + $k + 1900; 501 my $year = $y_ + $k + 1900;
471 my $month = $m_ - 1 - $k * 12; 502 my $month = $m_ - 1 - $k * 12;
472 503
473 # Time is in UTC, 24 bit, every nibble one digit in BCD from right to left 504 ($day, $month, $year)
474 my $hour = sprintf "%02x", ($time >> 16) & 0xFF; 505}
475 my $minute = sprintf "%02x", ($time >> 8) & 0xFF;
476 my $second = sprintf "%02x", ($time ) & 0xFF;
477 506
507sub datetime($$) {
508 (Linux::DVB::Decode::time $_[1], date $_[0])
509}
510
511sub time_linear($) {
512 my ($s, $m, $h) = Linux::DVB::Decode::time $_[0];
513
514 (($h * 60) + $m * 60) + $s
515}
516
517sub datetime_linear($$) {
478 return ($second, $minute, $hour, $day, $month, $year); 518 my ($sec, $min, $hour, $mday, $mon, $year) =
519 Linux::DVB::Decode::datetime $_[0], $_[1];
520
521 require Time::Local;
522 Time::Local::timegm ($sec, $min, $hour, $mday, $mon - 1, $year)
479} 523}
480 524
481=back 525=back
482 526
483=head1 AUTHORS 527=head1 AUTHORS

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