lily/midi-def.cc

   1 //
   2 // midi-def.cc -- implement midi output
   3 //
   4 // source file of the LilyPond music typesetter
   5 //
   6 // (c) 1997 Jan Nieuwenhuizen <jan@digicash.com>
   7
   8 #include <math.h>
   9 #include "misc.hh"
  10 #include "midi-def.hh"
  11 #include "debug.hh"
  12
  13 // classes, alphasorted
  14 //     statics
  15 //     constructors
  16 //     destructor
  17 //     routines, alphasorted
  18
  19 // statics Midi_def
  20 // ugh
  21 int Midi_def::den_i_s = 4;
  22 int Midi_def::num_i_s = 4;
  23
  24 Midi_def::Midi_def()
  25 {
  26     set_tempo( Moment( 1, 4 ), 60 );
  27     outfile_str_ = "lelie.midi";
  28 }
  29
  30 Midi_def::Midi_def( Midi_def const& midi_c_r )
  31 {
  32     whole_seconds_f_ = midi_c_r.whole_seconds_f_;
  33     outfile_str_ = midi_c_r.outfile_str_;
  34 }
  35
  36 Midi_def::~Midi_def()
  37 {
  38 }
  39
  40 Real
  41 Midi_def::duration_to_seconds_f( Moment moment )
  42 {
  43     if (!moment)
  44         return 0;
  45
  46     return Moment( whole_seconds_f_ ) * moment;
  47 }
  48
  49 int
  50 Midi_def::get_tempo_i( Moment moment )
  51 {
  52     return Moment( whole_seconds_f_ ) * Moment( 60 ) * moment;
  53 }
  54
  55 void
  56 Midi_def::print() const
  57 {
  58 #ifndef NPRINT
  59     mtor << "Midi {4/min: " << Real( 60 ) / ( whole_seconds_f_ * 4 );
  60     mtor << "out: " << outfile_str_;
  61     mtor << "}\n";
  62 #endif
  63 }
  64
  65 void
  66 Midi_def::set_tempo( Moment moment, int count_per_minute_i )
  67 {
  68     whole_seconds_f_ = Moment( count_per_minute_i ) / Moment( 60 ) / moment;
  69 }