tools/ARDOUR/SessionSRHandler.pm

   1 package ARDOUR::SessionSRHandler;
   2
   3
   4 use XML::Handler::XMLWriter;
   5 use POSIX qw(floor);
   6
   7 @ISA = qw( XML::Handler::XMLWriter );
   8
   9 $VERSION = 0.1;
  10
  11 # This table maps the "names of XML elements" to lists of "names of attributes" which should
  12 # be converted according to the SR change.
  13 # TODO: The table is a bit dirty, i have to figure out how to do it cleanly
  14 my $conversion_table = {
  15         "Location"  => { "end" => 0, "start" => 0 },
  16         "Region"    => { "length" => 0, "start" => 0, "position" => 0, "sync-position" => 0 },
  17         "Crossfade" => { "left" => 0, "right" => 0 }
  18         };
  19
  20
  21 sub new {
  22     my ($type, $original_sr, $new_sr, $output) = @_;
  23
  24         #my $self = XML::Handler::XMLWriter->new( { Output => $output } );
  25
  26         my $self = $type->SUPER::new( Output => $output );
  27
  28         $self->{Debug} = 0;
  29         $self->{Ratio} = ($new_sr+0)/($original_sr+0);
  30         $self->{OriginalSR} = $original_sr;
  31         $self->{TargetSR} = $new_sr;
  32         $self->{Output} = $output;
  33
  34         $self->{InEvents} = 0;
  35
  36         return $self;
  37 }
  38
  39 sub start_element {
  40         my $self = shift;
  41         my $element = shift;
  42
  43         my $debug = $self->{Debug};
  44
  45         my $atts = $element->{Attributes};
  46
  47         my $convert_attributes = $conversion_table->{$element->{Name}};
  48
  49         foreach my $cAtt (keys %$convert_attributes) {
  50                 $atts->{$cAtt} = sprintf("%.0f", $atts->{$cAtt} * $self->{Ratio});
  51                 $debug = 0;
  52         }
  53
  54         if ($debug eq 0) {
  55                 $self->SUPER::start_element($element, @_);
  56         }
  57
  58         if ($element->{Name} eq "events") {
  59                 $self->{InEvents} = 1;
  60         }
  61 }
  62
  63 sub end_element {
  64         my $self = shift;
  65         my $element = shift;
  66
  67         if ($self->{Debug} eq 0) {
  68                 $self->SUPER::end_element($element,@_);
  69         }
  70
  71         if ($element->{Name} eq "events") {
  72                 $self->{InEvents} = 0;
  73         }
  74 }
  75
  76 sub start_document {
  77         my $self = shift;
  78
  79         $self->SUPER::start_document(@_);
  80
  81         $self->{Output}->print("<!-- Sample rate converted from $self->{OriginalSR}hz to $self->{TargetSR}hz -->\n");
  82 }
  83
  84 sub end_document {
  85         my $self = shift;
  86
  87         $self->SUPER::end_document(@_);
  88 }
  89
  90 sub characters {
  91         my $self = shift;
  92         my $c = shift;
  93
  94         if ($self->{InEvents} > 0) {
  95                 my $converted = "";
  96
  97                 foreach my $foo (split(' ',$c->{Data})) {
  98                         if ($self->{InEvents} eq 1) {
  99                                 $converted .= floor($foo * $self->{Ratio})." ";
 100                                 $self->{InEvents} = 2;
 101                         } else {
 102                                 $converted .= $foo." ";
 103                                 $self->{InEvents} = 1;
 104                         }
 105                 }
 106
 107                 $c->{Data} = $converted;
 108         }
 109
 110
 111         if ($self->{Debug} eq 0) {
 112                 $self->SUPER::characters($c, @_);
 113         }
 114
 115 }
 116
 117 1;
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 120