lily/midi-def.cc

   1 /*
   2   midi-def.cc -- implement Midi_def
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--1999 Jan Nieuwenhuizen <janneke@gnu.org>
   7
   8 */
   9 #include <math.h>
  10 #include "misc.hh"
  11 #include "midi-def.hh"
  12 #include "translator.hh"
  13 #include "performance.hh"
  14 #include "score-performer.hh"
  15 #include "debug.hh"
  16
  17 // classes, alphasorted
  18 //     statics
  19 //     constructors
  20 //     destructor
  21 //     routines, alphasorted
  22
  23 Midi_def::Midi_def()
  24 {
  25   // ugh
  26   set_tempo (Moment (1, 4), 60);
  27 }
  28
  29 Midi_def::~Midi_def()
  30 {
  31 }
  32
  33 Real
  34 Midi_def::length_mom_to_seconds_f (Moment mom)
  35 {
  36   if (!mom)
  37     return 0;
  38
  39   return Moment (whole_in_seconds_mom_) * mom;
  40 }
  41
  42
  43 int
  44 Midi_def::get_tempo_i (Moment one_beat_mom)
  45 {
  46   Moment wholes_per_min = Moment(60) /Moment(whole_in_seconds_mom_);
  47   int beats_per_min = wholes_per_min / one_beat_mom;
  48   return int (beats_per_min);
  49 }
  50
  51 void
  52 Midi_def::set_tempo (Moment one_beat_mom, int beats_per_minute_i)
  53 {
  54   Moment beats_per_second = Moment (beats_per_minute_i) / Moment (60);
  55   whole_in_seconds_mom_ = Moment(1)/Moment(beats_per_second * one_beat_mom);
  56 }
  57
  58 void
  59 Midi_def::print() const
  60 {
  61 #ifndef NPRINT
  62   Music_output_def::print ();
  63   DOUT << "Midi {";
  64   DOUT << "4/min: " << Moment (60) / (whole_in_seconds_mom_ * Moment (4));
  65   DOUT << "}\n";
  66 #endif
  67 }
  68
  69 int Midi_def::default_count_i_=0;
  70
  71 int
  72 Midi_def::get_next_default_count () const
  73 {
  74   return default_count_i_++;
  75 }
  76
  77 void
  78 Midi_def::reset_default_count ()
  79 {
  80   default_count_i_ = 0;
  81 }