lib/duration.cc

   1 //
   2 // duration.cc -- implement Duration, Plet, Duration_convert, Duration_iterator
   3 //
   4 // copyright 1997 Jan Nieuwenhuizen <jan@digicash.com>
   5
   6 // split into 4?
   7
   8 #include "proto.hh"
   9 #include "plist.hh"
  10 #include "string.hh"
  11 #include "source-file.hh"
  12 #include "source.hh"
  13 #include "moment.hh"
  14 #include "duration.hh"
  15 #include "debug.hh"  //ugh
  16
  17 // statics Duration
  18 int Duration::division_1_i_s = 384 * 4;
  19
  20 Duration::Duration( int type_i, int dots_i = 0, Plet* plet_l )
  21 {
  22         type_i_ = type_i;
  23         dots_i_ = dots_i;
  24         plet_p_ = 0;
  25         ticks_i_ = 0;
  26         set_plet( plet_l );
  27 }
  28
  29 Duration::Duration( Duration const& dur_c_r )
  30 {
  31         type_i_ = 0;
  32         dots_i_ = 0;
  33         plet_p_ = 0;
  34         ticks_i_ = 0;
  35         *this = dur_c_r;
  36 }
  37
  38 Duration::~Duration()
  39 {
  40         delete plet_p_;
  41 }
  42
  43 Duration const&
  44 Duration::operator =( Duration const& dur_c_r )
  45 {
  46         if ( &dur_c_r == this )
  47                 return *this;
  48
  49         type_i_ = dur_c_r.type_i_;
  50         dots_i_ = dur_c_r.dots_i_;
  51         ticks_i_ = dur_c_r.ticks_i_;
  52         set_plet( dur_c_r.plet_p_ );
  53
  54         return *this;
  55 }
  56
  57 void
  58 Duration::set_plet( Plet* plet_l )
  59 {
  60         delete plet_p_;
  61         plet_p_ = 0;
  62         if ( plet_l )
  63                 plet_p_ = new Plet( *plet_l );
  64 }
  65
  66 void
  67 Duration::set_ticks( int ticks_i )
  68 {
  69         assert( !type_i_ );
  70         assert( !dots_i_ );
  71         assert( !plet_p_ );
  72         ticks_i_ = ticks_i;
  73 }
  74
  75 Plet::Plet( int iso_i, int type_i )
  76 {
  77         iso_i_ = iso_i;
  78         type_i_ = type_i;
  79 }
  80
  81
  82 // statics Duration_convert
  83 bool Duration_convert::be_blonde_b_s = false;
  84 bool Duration_convert::no_double_dots_b_s = false;
  85 bool Duration_convert::no_triplets_b_s = false;
  86 int Duration_convert::no_smaller_than_i_s = 0;
  87
  88 String
  89 Duration_convert::dur2_str( Duration dur )
  90 {
  91         if ( dur.ticks_i_ )
  92                 return String( "["  ) + String( dur.ticks_i_ ) + "]";
  93
  94         String str( dur.type_i_ );
  95         str += String( '.', dur.dots_i_ );
  96         if ( dur.plet_p_ )
  97                 str += String( "*" ) + String( dur.plet_p_->iso_i_ )
  98                         + String( "/" ) + String( dur.plet_p_->type_i_ );
  99         return str;
 100 }
 101
 102 #if 0
 103 int
 104 Duration_convert::dur2_i( Duration dur, int division_1_i )
 105 {
 106         return dur2_mom( dur ) * Moment( division_1_i );
 107 }
 108 #endif
 109
 110 int
 111 Duration_convert::dur2ticks_i( Duration dur )
 112 {
 113         if ( dur.ticks_i_ )
 114                 return dur.ticks_i_;
 115         return dur2_mom( dur ) * Moment( Duration::division_1_i_s );
 116 }
 117
 118 Moment
 119 Duration_convert::dur2_mom( Duration dur )
 120 {
 121         if ( dur.ticks_i_ )
 122                 return Moment( dur.ticks_i_, Duration::division_1_i_s );
 123
 124         // or simply assert?
 125         if ( !dur.type_i_ )
 126                 return Moment( 0 );
 127
 128         Moment mom = Moment( 1 , dur.type_i_ );
 129
 130         Moment delta = mom;
 131         while ( dur.dots_i_-- ) {
 132                 delta /= 2.0;
 133                 mom += delta;
 134         }
 135
 136         return mom * plet_factor_mom( dur );
 137 }
 138
 139 #if 0
 140 Moment
 141 Duration_convert::i2_mom( int time_i, int division_1_i )
 142 {
 143         if ( !time_i )
 144                 return Moment( 0 );
 145
 146         if ( division_1_i > 0 )
 147                 return Moment( time_i, division_1_i );
 148         else
 149                 return Moment( -division_1_i, time_i );
 150 }
 151 #endif
 152
 153 #if 0
 154 Duration
 155 Duration_convert::mom2_dur( Moment mom )
 156 {
 157         /* this is cute,
 158            but filling an array using Duration_iterator
 159            might speed things up, a little
 160            */
 161         Duration_iterator iter_dur;
 162         assert( iter_dur );
 163         while ( iter_dur ) {
 164                 Duration lower_dur = iter_dur++;
 165                 Duration upper_dur( 0 );
 166                 if ( iter_dur )
 167                         upper_dur = iter_dur();
 168                 Moment lower_mom = dur2_mom( lower_dur );
 169                 Moment upper_mom = dur2_mom( upper_dur );
 170                 if ( mom == lower_mom )
 171                         return lower_dur;
 172                 if ( mom == upper_mom ) // don-t miss last (sic)
 173                         return upper_dur;
 174                 if ( ( mom >= lower_mom ) && ( mom <= upper_mom ) ) {
 175                         warning( String( "duration not exact: " ) + String( (Real)mom ) , 0 );
 176                         if ( abs( mom - lower_mom ) < abs( mom - upper_mom ) )
 177                                 return lower_dur;
 178                         else
 179                                 return upper_dur;
 180                 }
 181                 lower_dur = upper_dur;
 182         }
 183         return Duration( 0 );
 184 }
 185 #endif
 186
 187 Moment
 188 Duration_convert::plet_factor_mom( Duration dur )
 189 {
 190         if ( !dur.plet_p_ )
 191                 return 1;
 192         return Moment( dur.plet_p_->iso_i_, dur.plet_p_->type_i_ );
 193 }
 194
 195 Real
 196 Duration_convert::sync_f( Duration dur, Moment mom )
 197 {
 198         return mom / dur2_mom( dur );
 199 }
 200
 201 Duration
 202 Duration_convert::ticks2_dur( int ticks_i )
 203 {
 204         /* this is cute,
 205            but filling an array using Duration_iterator
 206            might speed things up, a little
 207            */
 208         Moment mom( ticks_i, Duration::division_1_i_s );
 209         Duration_iterator iter_dur;
 210         assert( iter_dur );
 211         while ( iter_dur ) {
 212                 Duration dur = iter_dur++;
 213                 if ( mom == dur2_mom( dur ) )
 214                         return dur;
 215         }
 216         Duration dur( 0 );
 217         dur.set_ticks( ticks_i );
 218         return dur;
 219 }
 220
 221 Duration
 222 Duration_convert::ticks2standardised_dur( int ticks_i )
 223 {
 224         /* this is cute,
 225            but filling an array using Duration_iterator
 226            might speed things up, a little
 227            */
 228         Moment mom( ticks_i, Duration::division_1_i_s );
 229         Duration_iterator iter_dur;
 230         assert( iter_dur );
 231         while ( iter_dur ) {
 232                 Duration lower_dur = iter_dur++;
 233 //              Duration upper_dur( 0 );
 234                 Duration upper_dur( 1, 1 );
 235                 if ( iter_dur )
 236                         upper_dur = iter_dur();
 237                 Moment lower_mom = dur2_mom( lower_dur );
 238                 Moment upper_mom = dur2_mom( upper_dur );
 239                 if ( mom < lower_mom )
 240                         return lower_dur;
 241                 if ( mom == lower_mom )
 242                         return lower_dur;
 243                 if ( mom == upper_mom ) // don-t miss last (sic)
 244                         return upper_dur;
 245                 if ( ( mom >= lower_mom ) && ( mom <= upper_mom ) ) {
 246                         warning( String( "duration not exact: " ) + String( (Real)mom ) , 0 );
 247                         if ( abs( mom - lower_mom ) < abs( mom - upper_mom ) )
 248                                 return lower_dur;
 249                         else
 250                                 return upper_dur;
 251                 }
 252                 lower_dur = upper_dur;
 253         }
 254         return iter_dur();
 255 }
 256
 257 Duration_iterator::Duration_iterator()
 258 {
 259         cursor_dur_.type_i_ = 128;
 260         if ( Duration_convert::no_smaller_than_i_s )
 261                 cursor_dur_.type_i_ = Duration_convert::no_smaller_than_i_s;
 262         cursor_dur_.set_plet( 0 );
 263 }
 264
 265 Duration
 266 Duration_iterator::operator ++(int)
 267 {
 268         return forward_dur();
 269 }
 270
 271 Duration
 272 Duration_iterator::operator ()()
 273 {
 274         return dur();
 275 }
 276
 277 Duration_iterator::operator bool()
 278 {
 279         return ok();
 280 }
 281
 282 Duration
 283 Duration_iterator::dur()
 284 {
 285         return cursor_dur_;
 286 }
 287
 288 Duration
 289 Duration_iterator::forward_dur()
 290 {
 291         // should do smart table? guessing:
 292         //      duration wholes
 293         //      16      0.0625
 294         //      32..    0.0703
 295         //      8:2/3   0.0833
 296         //      16.     0.0938
 297         //      8       0.1250
 298         //      16..    0.1406
 299         //      4:2/3   0.1667
 300         //      8.      0.1875
 301
 302         assert( ok() );
 303
 304         Duration dur = cursor_dur_;
 305
 306         if ( !cursor_dur_.dots_i_ && !cursor_dur_.plet_p_ ) {
 307                 cursor_dur_.type_i_ *= 2;
 308                 cursor_dur_.dots_i_ = 2;
 309         }
 310         else if ( cursor_dur_.dots_i_ == 2 ) {
 311                 assert( !cursor_dur_.plet_p_ );
 312                 cursor_dur_.dots_i_ = 0;
 313                 cursor_dur_.type_i_ /= 4;
 314                 cursor_dur_.set_plet( &Plet( 2, 3 ) );
 315         }
 316         else if ( cursor_dur_.plet_p_
 317                 && ( cursor_dur_.plet_p_->iso_i_ == 2 )
 318                 && ( cursor_dur_.plet_p_->type_i_ == 3 ) ) {
 319                 assert( !cursor_dur_.dots_i_ );
 320                 cursor_dur_.set_plet( 0 );
 321                 cursor_dur_.type_i_ *= 2;
 322                 cursor_dur_.dots_i_ = 1;
 323         }
 324         else if ( cursor_dur_.dots_i_ == 1 ) {
 325                 assert( !cursor_dur_.plet_p_ );
 326                 cursor_dur_.dots_i_ = 0;
 327                 cursor_dur_.type_i_ /= 2;
 328         }
 329
 330         if ( Duration_convert::no_triplets_b_s && cursor_dur_.plet_p_ && ok() )
 331                 forward_dur();
 332         if ( Duration_convert::no_double_dots_b_s && ( cursor_dur_.dots_i_ == 2 ) && ok() )
 333                 forward_dur();
 334         if ( Duration_convert::no_smaller_than_i_s && ( cursor_dur_.type_i_ > Duration_convert::no_smaller_than_i_s ) && ok() )
 335                 forward_dur();
 336         if ( Duration_convert::no_smaller_than_i_s && cursor_dur_.dots_i_ && ( cursor_dur_.type_i_ >= Duration_convert::no_smaller_than_i_s ) && ok() )
 337                 forward_dur();
 338         if ( Duration_convert::no_smaller_than_i_s && ( cursor_dur_.dots_i_ == 2 ) && ( cursor_dur_.type_i_ >= Duration_convert::no_smaller_than_i_s / 2 ) && ok() )
 339                 forward_dur();
 340
 341         return dur;
 342 }
 343
 344 bool
 345 Duration_iterator::ok()
 346 {
 347         return ( cursor_dur_.type_i_
 348                 && !( ( cursor_dur_.type_i_ == 1 ) && ( cursor_dur_.dots_i_ > 2 ) ) );
 349 }