midi2ly/include/duration-convert.hh

   1 /*
   2   duration-convert.hh -- declare Duration_convert
   3
   4   source file of the LilyPond music typesetter
   5
   6   (c)  1997--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9
  10 #ifndef DURATION_CONVERT_HH
  11 #define DURATION_CONVERT_HH
  12 #include "duration.hh"
  13 #include "string.hh"
  14 #include "array.hh"
  15
  16 /**
  17         Duration_convert handles all conversions to -n fro Duration (dur).
  18         That is including (integer + division) representation for MIDI,
  19         and conversion from unexact time representation (best guess :-).
  20
  21         A Rational (mom) is a Rational that holds the time fraction
  22         compared to a whole note (before also called wholes).
  23
  24         [todo]
  25         move all statics to real members, instantiate Duration_convert
  26         object (s).
  27 */
  28 struct Duration_convert {
  29
  30   /* Urgh. statics.
  31    */
  32   static bool no_quantify_b_s;
  33   static bool no_double_dots_b_s;
  34   static bool no_tuplets_b_s;
  35   static int no_smaller_than_i_s;
  36   static Array<Duration> dur_array_s;
  37
  38   /// Return number of ticks in (ticks, division_1) representation
  39   static int dur2ticks_i (Duration dur );
  40
  41   /// Return the type_i representation of note length i
  42   static int i2_type (int i);
  43
  44   /// Return the note length corresponding to the type_i representation
  45   /// Return 0 if longer than whole note.
  46   static int type2_i (int type);
  47
  48   /// Return Rational representation (fraction of whole note).
  49   static Rational dur2_mom (Duration dur );
  50
  51   /// Return Lilypond string representation.
  52   static String dur2_str (Duration dur );
  53
  54   /// Return duration from Rational (fraction of whole) representation.
  55   static Duration mom2_dur (Rational mom );
  56
  57   /// Return standardised duration, best guess if not exact.
  58   static Duration mom2standardised_dur (Rational mom );
  59
  60   /// Return plet factor (not a Rational: should use Rational?).
  61   static Rational plet_factor_mom (Duration dur );
  62
  63   static void set_array ();
  64
  65   /** Return synchronisation factor for mom, so that
  66       mom2_dur (mom / sync_f ) will return the duration dur.
  67   */
  68   static Real sync_f (Duration dur, Rational mom );
  69
  70   /// Return exact duration, in midi-ticks if not-exact.
  71   static Duration ticks2_dur (int ticks_i );
  72
  73   /// Return standardised duration, best guess if not exact.
  74   static Duration ticks2standardised_dur (int ticks_i );
  75 };
  76
  77
  78 #endif // DURATION_CONVERT_HH