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package MIDI::XML::Message; |
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use 5.006; |
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use strict; |
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use warnings; |
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our @ISA = qw(); |
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our $VERSION = '0.02'; |
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=head1 NAME |
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MIDI::XML::Channel - Base class for deriving MIDI message classes. |
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=head1 SYNOPSIS |
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use MIDI::XML::Message; |
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MIDI::XML::Message->as_MidiXML($self); |
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=head1 DESCRIPTION |
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MIDI::XML::Message is the base class from which MIDI Message objects are |
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derived. It should not generally be used directly except as shown in the |
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classes for the individual messages. |
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=head2 EXPORT |
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None. |
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=head1 METHODS AND ATTRIBUTES |
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=over 4 |
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=cut |
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#========================================================================== |
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=item $delta_time = $Obj->delta() or $Obj->delta($delta_time); |
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Returns the message time as a delta time or undef if it is an absolute |
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time. Optionally sets the message time to the specified delta time. To |
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avoid contradictory times, the absolute time is set to undef when a delta time |
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is set. |
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=cut |
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sub delta { |
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0
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my $self = shift; |
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0
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0
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if (@_) { |
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0
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$self->{'_Delta'} = shift; |
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0
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$self->{'_Absolute'} = undef; |
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} |
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0
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return $self->{'_Delta'}; |
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} |
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#========================================================================== |
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58
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=item $absolute_time = $Obj->absolute() or $Obj->absolute($absolute_time); |
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60
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Returns the message time as an absolute time or undef if it is a delta |
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time. Optionally sets the message time to the specified absolute time. To |
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avoid contradictory times, the delta time is set to undef when an absolute time |
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is set. |
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64
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65
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=cut |
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67
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sub absolute { |
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0
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0
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1
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my $self = shift; |
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69
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0
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0
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if (@_) { |
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0
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$self->{'_Absolute'} = shift; |
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71
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0
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$self->{'_Delta'} = undef; |
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72
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} |
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0
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return $self->{'_Absolute'}; |
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} |
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76
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#========================================================================== |
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77
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78
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=item $time = $Obj->time(); |
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79
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80
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Returns the message time, absolute or delta, whichever was last set. |
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81
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82
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=cut |
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83
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84
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sub time { |
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85
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0
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1
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my $self = shift; |
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86
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87
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0
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0
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if ( defined($self->{'_Delta'})) { |
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0
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88
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0
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return $self->{'_Delta'}; |
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89
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} elsif ( defined($self->{'_Absolute'})) { |
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90
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0
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return $self->{'_Absolute'}; |
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91
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} |
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92
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93
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0
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return undef; |
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94
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} |
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95
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96
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#========================================================================== |
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97
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98
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=item @xml = $Obj->as_MidiXML(); |
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99
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100
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This method is called by the as_MusicXML methods of derived classes. |
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101
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102
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Returns an array of elements formatted according to the MidiXML DTD. |
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103
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104
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=back |
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105
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106
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=cut |
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107
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108
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sub as_MidiXML { |
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109
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0
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0
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1
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my $self = shift; |
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110
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0
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my @xml; |
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111
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112
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113
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0
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push @xml, ""; |
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114
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0
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0
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if ( defined($self->{'_Absolute'})) { |
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0
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115
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0
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push @xml, "$self->{'_Absolute'}"; |
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116
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} elsif ( defined($self->{'_Delta'})) { |
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117
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0
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push @xml, "$self->{'_Delta'}"; |
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118
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} |
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119
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0
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push @xml, undef; |
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120
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0
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push @xml, ""; |
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121
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0
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return @xml; |
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122
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} |
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123
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124
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#========================================================================== |
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125
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126
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127
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return 1; |
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128
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__END__ |