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sshaw

NAME

Time::Timecode - Video timecode class

SYNOPSIS

 use Time::Timecode;

 my $tc1 = Time::Timecode->new(2, 0, 0, 12); # hh, mm, ss, ff
 print $tc1->fps;                            # $DEFAULT_FPS
 print $tc1;                                 # 02:00:00:12
 print $tc1->hours;                          # 2
 print $tc1->hh;                             # shorthanded version

 my $tc2 = Time::Timecode->new('00:10:30:00', { fps => 25 } );
 print $tc2->total_frames;                   # 15750
 print $tc2->fps;                            # 25

 $tc2 = Time::Timecode->new(1800);           # Total frames
 print $tc1 + $tc2;                          # 02:01:00:12

 $tc1 = Time::Timecode->new('00:01:00;04');  # Dropframe ( see the ";" )
 print $tc1->is_dropframe;                   # 1

 my $diff = $tc1 - 1800;                     # Subtract 1800 frames
 print $tc1->is_dropframe;                   # Maintains LHS' opts
 print $diff;                                # 00:00:02;00

 my $opts = { delimiter => ',', frame_delimiter => '+' };
 $Time::Timecode::DEFAULT_FPS = 23.976;      
 $tc2 = Time::Timecode->new('00,10,30+00', $opts); 
 print $tc2->fps                             # 23.976
 print $tc2->minutes;                        # 10
 print $tc2->seconds;                        # 30

 # Conversions
 my $pal  = $tc->convert(25);
 my $ntsc = $pal->convert(30), { dropframe => 1 });
 my $ndf  = $ntsc->to_non_dropframe;
 

DESCRIPTION

Time::Timecode supports any frame rate, drop/non-drop frame counts, basic arithmetic, and conversion between frame rates and drop/non-drop frame counts. The only requirements are that the timecode be between 00:00:00:00 and 99:99:99:99, inclusive, and frames per second (fps) are greater than zero. This means that you can create nonstandard timecodes (feature or bug? :^). Dropframe rules will still apply.

Time::Timecode instances can be created from a a variety of representations, see "CONSTRUCTOR".

Time::Timecode instances are immutable.

CONSTRUCTOR

new( TIMECODE [, OPTIONS ] )

Creates an immutable instance for TIMECODE with the given set of OPTIONS. If no OPTIONS are given the "package defaults" are used.

TIMECODE

TIMECODE can be one of the following:

  • A list denoting hours, minutes, seconds, and/or frames:

     $tc1 = Time::Timecode->new(1, 2, 3)
     $tc1 = Time::Timecode->new(1, 2, 3, 0)   #same as above
  • Frame count:

     $tc1 = Time::Timecode->new(1800)   # 00:01:00:00 @ 30 fps
  • Timecode string:

     $tc1 = Time::Timecode->new('00:02:00:25')

    Timecode strings with dropframe frame delimiters

    In the video encoding world timecodes with a frame delimiter of '.' or ';' are dropframe. If either of these characters are used in the timecode string passed to new() the resulting instance will dropframe.

    This can be overridden by setting the "dropframe argument" to false.

OPTIONS

OPTIONS must be a hash reference containg any of the following:

    fps: Frames per second, must be greater than 0. Decimal values are rounded 0 places when performing calculations: 29.976 becomes 30. Defaults to $Time::Timecode::DEFAULT_FPS

    dropframe: A boolean value denoting wheather or not the timecode is dropframe. Defaults to $Time::Timecode::DEFAULT_DROPFRAME.

    delimiter: The character used to delimit the timecode's hours, minutes, and seconds. Use the frame_delimiter option for delimiting the frames. Defaults to $Time::Timecode::DEFAULT_DELIMITER.

    frame_delimiter: The character used to delimit the timecode's frames. Use the delimiter option for delimiting the rest of the timecode. Defaults to $Time::Timecode::DEFAULT_FRAME_DELIMITER.

METHODS

All time part accessors return an integer.

hours()
hrs()
hh()

Returns the hour part of the timecode

minutes()
mins()
mm()

Returns the mintue part of the timecode

seconds()
secs()
ss()

Returns the second part of the timecode

frames()
ff()

Returns the frame part of the timecode

fps()

Returns the frames per second

to_string()

Returns the timecode as string in a HH:MM:SS:FF format.

The delimiter used to separate each portion of the timecode can vary. If the delimiter or frame_delimiter options were provided they will be used here. If the timecode was created from a timecode string that representation will be reconstructed.

This method is overloaded. Using a Time::Timecode instance in a scalar context results in a call to to_string().

is_dropframe()

Returns a boolean value denoting whether or not the timecode is dropframe.

to_non_dropframe()

Converts the timecode to non-dropframe and returns a new Time::Timecode instance. The framerate is not changed.

If the current timecode is non-dropframe $self is returned.

to_dropframe()

Converts the timecode to dropframe and returns a new Time::Timecode instance. The framerate is not changed.

If the current timecode is dropframe $self is returned.

convert( FPS [, OPTIONS ] )

Converts the timecode to FPS and returns a new instance.

OPTIONS are the same as those allowed by the CONSTRUCTOR. Any unspecified options are taken from the calling instance.

The converted timecode will be non-dropframe.

ARITHMATIC

Addition
Subtraction
Multiplacation
Division

All results get their options from the left hand side (LHS) of the expression. If LHS is a literal, options will be taken from RHS.

DEFAULTS

These can be overridden when creating a new instance.

$DEFAULT_FPS = 29.97

$DEFAULT_DROPFRAME = 0

$DEFAULT_DELIMITER = ':'

$DEFAULT_FRAME_DELIMITER = ':'

AUTHOR

Skye Shaw (sshaw AT lucas.cis.temple.edu)

REFERENCES

For information about dropframe timecodes see: http://dropframetimecode.org/, http://en.wikipedia.org/wiki/SMPTE_time_code#Drop_frame_timecode

COPYRIGHT

Copyright (c) 2009-2010 Skye Shaw. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.