cinelerra-5.1/cinelerra/tracks.C

   1 /*
   2  * CINELERRA
   3  * Copyright (C) 2010 Adam Williams <broadcast at earthling dot net>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  *
  19  */
  20
  21 #include "atrack.h"
  22 #include "automation.h"
  23 #include "clip.h"
  24 #include "bchash.h"
  25 #include "edit.h"
  26 #include "edits.h"
  27 #include "edl.h"
  28 #include "edlsession.h"
  29 #include "file.h"
  30 #include "filexml.h"
  31 #include "intauto.h"
  32 #include "intautos.h"
  33 #include "localsession.h"
  34 #include "module.h"
  35 #include "panauto.h"
  36 #include "panautos.h"
  37 #include "patchbay.h"
  38 #include "plugin.h"
  39 #include "mainsession.h"
  40 #include "strack.h"
  41 #include "theme.h"
  42 #include "track.h"
  43 #include "trackcanvas.h"
  44 #include "tracks.h"
  45 #include "transportque.inc"
  46 #include "vtrack.h"
  47 #include <string.h>
  48
  49 Tracks::Tracks(EDL *edl)
  50  : List<Track>()
  51 {
  52         this->edl = edl;
  53 }
  54
  55 Tracks::Tracks()
  56  : List<Track>()
  57 {
  58 }
  59
  60
  61 Tracks::~Tracks()
  62 {
  63         delete_all_tracks();
  64 }
  65
  66
  67
  68
  69
  70 void Tracks::equivalent_output(Tracks *tracks, double *result)
  71 {
  72         if(total_playable_vtracks() != tracks->total_playable_vtracks())
  73         {
  74                 *result = 0;
  75         }
  76         else
  77         {
  78                 Track *current = first;
  79                 Track *that_current = tracks->first;
  80                 while(current || that_current)
  81                 {
  82 // Get next video track
  83                         while(current && current->data_type != TRACK_VIDEO)
  84                                 current = NEXT;
  85
  86                         while(that_current && that_current->data_type != TRACK_VIDEO)
  87                                 that_current = that_current->next;
  88
  89 // One doesn't exist but the other does
  90                         if((!current && that_current) ||
  91                                 (current && !that_current))
  92                         {
  93                                 *result = 0;
  94                                 break;
  95                         }
  96                         else
  97 // Both exist
  98                         if(current && that_current)
  99                         {
 100                                 current->equivalent_output(that_current, result);
 101                                 current = NEXT;
 102                                 that_current = that_current->next;
 103                         }
 104                 }
 105         }
 106 }
 107
 108
 109 void Tracks::clear_selected_edits()
 110 {
 111         for( Track *track=first; track; track=track->next ) {
 112                 for( Edit *edit=track->edits->first; edit; edit=edit->next )
 113                         edit->is_selected = 0;
 114         }
 115 }
 116
 117 void Tracks::get_selected_edits(ArrayList<Edit*> *drag_edits)
 118 {
 119         drag_edits->remove_all();
 120         for( Track *track=first; track; track=track->next ) {
 121                 if( !track->is_armed() ) continue;
 122                 for( Edit *edit=track->edits->first; edit; edit=edit->next ) {
 123                         if( !edit->is_selected ) continue;
 124                         drag_edits->append(edit);
 125                 }
 126         }
 127 }
 128
 129 void Tracks::get_automation_extents(float *min,
 130         float *max,
 131         double start,
 132         double end,
 133         int autogrouptype)
 134 {
 135         *min = 0;
 136         *max = 0;
 137         int coords_undefined = 1;
 138         for(Track *current = first; current; current = NEXT)
 139         {
 140                 if(current->is_armed())
 141                 {
 142                         current->automation->get_extents(min,
 143                                 max,
 144                                 &coords_undefined,
 145                                 current->to_units(start, 0),
 146                                 current->to_units(end, 1),
 147                                 autogrouptype);
 148                 }
 149         }
 150 }
 151
 152
 153 void Tracks::copy_from(Tracks *tracks)
 154 {
 155         Track *new_track = 0;
 156
 157         delete_all_tracks();
 158         int solo_track_id = tracks->edl->local_session->solo_track_id;
 159
 160         for(Track *current = tracks->first; current; current = NEXT)
 161         {
 162                 switch(current->data_type)
 163                 {
 164                 case TRACK_AUDIO:
 165                         new_track = add_audio_track(0, 0);
 166                         break;
 167                 case TRACK_VIDEO:
 168                         new_track = add_video_track(0, 0);
 169                         break;
 170                 case TRACK_SUBTITLE:
 171                         new_track = add_subttl_track(0, 0);
 172                         break;
 173                 default:
 174                         continue;
 175                 }
 176                 new_track->copy_from(current);
 177
 178                 if( current->get_id() == solo_track_id )
 179                         edl->local_session->solo_track_id = new_track->get_id();
 180         }
 181 }
 182
 183 Tracks& Tracks::operator=(Tracks &tracks)
 184 {
 185 printf("Tracks::operator= 1\n");
 186         copy_from(&tracks);
 187         return *this;
 188 }
 189
 190 int Tracks::load(FileXML *xml,
 191         int &track_offset,
 192         uint32_t load_flags)
 193 {
 194 // add the appropriate type of track
 195         char string[BCTEXTLEN];
 196         Track *track = 0;
 197         string[0] = 0;
 198
 199         xml->tag.get_property("TYPE", string);
 200
 201         if((load_flags & LOAD_ALL) == LOAD_ALL ||
 202                 (load_flags & LOAD_EDITS)) {
 203                 if(!strcmp(string, "VIDEO")) {
 204                         track = add_video_track(0, 0);
 205                 }
 206                 else if(!strcmp(string, "SUBTTL")) {
 207                         track = add_subttl_track(0, 0);
 208                 }
 209                 else {
 210                         track = add_audio_track(0, 0);    // default to audio
 211                 }
 212         }
 213         else {
 214                 track = get_item_number(track_offset++);
 215         }
 216
 217 // load it
 218         if( track ) track->load(xml, track_offset, load_flags);
 219
 220         return 0;
 221 }
 222
 223 Track* Tracks::add_audio_track(int above, Track *dst_track)
 224 {
 225         ATrack* new_track = new ATrack(edl, this);
 226         if(!dst_track)
 227         {
 228                 dst_track = (above ? first : last);
 229         }
 230
 231         if(above)
 232         {
 233                 insert_before(dst_track, (Track*)new_track);
 234         }
 235         else
 236         {
 237                 insert_after(dst_track, (Track*)new_track);
 238 // Shift effects referenced below the destination track
 239         }
 240
 241 // Shift effects referenced below the new track
 242         for(Track *track = last;
 243                 track && track != new_track;
 244                 track = track->previous)
 245         {
 246                 change_modules(number_of(track) - 1, number_of(track), 0);
 247         }
 248
 249
 250         new_track->create_objects();
 251         new_track->set_default_title();
 252
 253         int current_pan = 0;
 254         for(Track *current = first;
 255                 current != (Track*)new_track;
 256                 current = NEXT)
 257         {
 258                 if(current->data_type == TRACK_AUDIO) current_pan++;
 259                 if(current_pan >= edl->session->audio_channels) current_pan = 0;
 260         }
 261
 262
 263
 264         PanAuto* pan_auto =
 265                 (PanAuto*)new_track->automation->autos[AUTOMATION_PAN]->default_auto;
 266         pan_auto->values[current_pan] = 1.0;
 267
 268         BC_Pan::calculate_stick_position(edl->session->audio_channels,
 269                 edl->session->achannel_positions,
 270                 pan_auto->values,
 271                 MAX_PAN,
 272                 PAN_RADIUS,
 273                 pan_auto->handle_x,
 274                 pan_auto->handle_y);
 275         return new_track;
 276 }
 277
 278 Track* Tracks::add_video_track(int above, Track *dst_track)
 279 {
 280         VTrack* new_track = new VTrack(edl, this);
 281         if(!dst_track)
 282                 dst_track = (above ? first : last);
 283         if(above)
 284                 insert_before(dst_track, (Track*)new_track);
 285         else
 286                 insert_after(dst_track, (Track*)new_track);
 287
 288         for(Track *track = last; track && track != new_track; track = track->previous)
 289                 change_modules(number_of(track) - 1, number_of(track), 0);
 290
 291         new_track->create_objects();
 292         new_track->set_default_title();
 293         return new_track;
 294 }
 295
 296
 297 Track* Tracks::add_subttl_track(int above, Track *dst_track)
 298 {
 299         STrack* new_track = new STrack(edl, this);
 300         if(!dst_track)
 301                 dst_track = (above ? first : last);
 302
 303         if(above)
 304                 insert_before(dst_track, (Track*)new_track);
 305         else
 306                 insert_after(dst_track, (Track*)new_track);
 307
 308         for(Track *track = last; track && track != new_track; track = track->previous)
 309                 change_modules(number_of(track) - 1, number_of(track), 0);
 310
 311         new_track->create_objects();
 312         new_track->set_default_title();
 313 //      new_track->paste_silence(0,total_length(),0);
 314         return new_track;
 315 }
 316
 317
 318 int Tracks::delete_track(Track *track, int gang)
 319 {
 320         if( !track ) return 0;
 321         if( gang < 0 )
 322                 gang = edl->session->gang_tracks != GANG_NONE ? 1 : 0;
 323         Track *nxt = track->next;
 324         if( gang ) {
 325                 while( track && !track->master && track->previous )
 326                         track = track->previous;
 327                 while( nxt && !nxt->master )
 328                         nxt = nxt->next;
 329         }
 330         Track *current = track;
 331         int old_location = number_of(current);
 332         for( Track *next_track=0; current!=nxt; current=next_track ) {
 333                 next_track = current->next;
 334                 detach_shared_effects(old_location);
 335                 for( Track *curr=current; curr; curr=curr->next ) {
 336 // Shift effects referencing effects below the deleted track
 337                         change_modules(number_of(curr), number_of(curr)-1, 0);
 338                 }
 339                 delete current;
 340         }
 341         return 0;
 342 }
 343
 344 int Tracks::detach_shared_effects(int module)
 345 {
 346         for( Track *current=first; current; current=NEXT ) {
 347                 current->detach_shared_effects(module);
 348         }
 349         return 0;
 350 }
 351 int Tracks::detach_ganged_effects(Plugin *plugin)
 352 {
 353         if( edl->session->gang_tracks == GANG_NONE ) return 1;
 354         for( Track *current=first; current; current=NEXT ) {
 355                 if( current == plugin->track ) continue;
 356                 if( !current->armed_gang(plugin->track) ) continue;
 357                 current->detach_ganged_effects(plugin);
 358         }
 359         return 0;
 360 }
 361
 362 int Tracks::total_of(int type)
 363 {
 364         int result = 0;
 365
 366         for(Track *current = first; current; current = NEXT)
 367         {
 368                 long unit_start = current->to_units(edl->local_session->get_selectionstart(1), 0);
 369                 Auto *mute_keyframe = 0;
 370                 current->automation->autos[AUTOMATION_MUTE]->
 371                         get_prev_auto(unit_start, PLAY_FORWARD, mute_keyframe);
 372                 IntAuto *mute_auto = (IntAuto *)mute_keyframe;
 373
 374                 result +=
 375                         (current->play && type == PLAY) ||
 376                         (current->is_armed() && type == RECORD) ||
 377                         (current->is_ganged() && type == GANG) ||
 378                         (current->draw && type == DRAW) ||
 379                         (mute_auto->value && type == MUTE) ||
 380                         (current->expand_view && type == EXPAND);
 381         }
 382         return result;
 383 }
 384
 385 int Tracks::recordable_audio_tracks()
 386 {
 387         int result = 0;
 388         for(Track *current = first; current; current = NEXT)
 389                 if(current->data_type == TRACK_AUDIO && current->is_armed()) result++;
 390         return result;
 391 }
 392
 393 int Tracks::recordable_video_tracks()
 394 {
 395         int result = 0;
 396         for(Track *current = first; current; current = NEXT)
 397         {
 398                 if(current->data_type == TRACK_VIDEO && current->is_armed()) result++;
 399         }
 400         return result;
 401 }
 402
 403
 404 int Tracks::playable_audio_tracks()
 405 {
 406         int result = 0;
 407
 408         for(Track *current = first; current; current = NEXT)
 409         {
 410                 if(current->data_type == TRACK_AUDIO && current->play)
 411                 {
 412                         result++;
 413                 }
 414         }
 415
 416         return result;
 417 }
 418
 419 int Tracks::playable_video_tracks()
 420 {
 421         int result = 0;
 422
 423         for(Track *current = first; current; current = NEXT)
 424         {
 425                 if(current->data_type == TRACK_VIDEO && current->play)
 426                 {
 427                         result++;
 428                 }
 429         }
 430         return result;
 431 }
 432
 433 int Tracks::total_audio_tracks()
 434 {
 435         int result = 0;
 436         for(Track *current = first; current; current = NEXT)
 437                 if(current->data_type == TRACK_AUDIO) result++;
 438         return result;
 439 }
 440
 441 int Tracks::total_video_tracks()
 442 {
 443         int result = 0;
 444         for(Track *current = first; current; current = NEXT)
 445                 if(current->data_type == TRACK_VIDEO) result++;
 446         return result;
 447 }
 448
 449 double Tracks::total_playable_length()
 450 {
 451         double total = 0;
 452         for(Track *current = first; current; current = NEXT)
 453         {
 454                 if( current->play )
 455                 {
 456                         double length = current->get_length();
 457                         if(length > total) total = length;
 458                 }
 459         }
 460         return total;
 461 }
 462
 463 double Tracks::total_recordable_length()
 464 {
 465         double total = -1;
 466         for(Track *current = first; current; current = NEXT)
 467         {
 468                 if(current->is_armed())
 469                 {
 470                         double length = current->get_length();
 471                         if(length > total) total = length;
 472                 }
 473         }
 474         return total;
 475 }
 476
 477 double Tracks::total_length()
 478 {
 479         double total = 0;
 480         for(Track *current = first; current; current = NEXT)
 481         {
 482                 double length = current->get_length();
 483                 if(length > total) total = length;
 484         }
 485         return total;
 486 }
 487
 488 double Tracks::total_audio_length()
 489 {
 490         double total = 0;
 491         for(Track *current = first; current; current = NEXT)
 492         {
 493                 if(current->data_type == TRACK_AUDIO &&
 494                         current->get_length() > total) total = current->get_length();
 495         }
 496         return total;
 497 }
 498
 499 double Tracks::total_video_length()
 500 {
 501         double total = 0;
 502         for(Track *current = first; current; current = NEXT)
 503         {
 504                 if(current->data_type == TRACK_VIDEO &&
 505                         current->get_length() > total) total = current->get_length();
 506         }
 507         return total;
 508 }
 509
 510 double Tracks::total_length_framealigned(double fps)
 511 {
 512         if (total_audio_tracks() && total_video_tracks())
 513                 return MIN(floor(total_audio_length() * fps), floor(total_video_length() * fps)) / fps;
 514
 515         if (total_audio_tracks())
 516                 return floor(total_audio_length() * fps) / fps;
 517
 518         if (total_video_tracks())
 519                 return floor(total_video_length() * fps) / fps;
 520
 521         return 0;
 522 }
 523
 524 void Tracks::translate_fauto_xy(int fauto, float dx, float dy, int all)
 525 {
 526         Track *track = first;
 527         for( ; track; track=track->next ) {
 528                 if( !all && !track->is_armed() ) continue;
 529                 if( track->data_type != TRACK_VIDEO ) continue;
 530                 ((VTrack*)track)->translate(fauto, dx, dy, all);
 531         }
 532 }
 533
 534 void Tracks::translate_projector(float dx, float dy, int all)
 535 {
 536         translate_fauto_xy(AUTOMATION_PROJECTOR_X, dx, dy, all);
 537 }
 538
 539 void Tracks::translate_camera(float dx, float dy, int all)
 540 {
 541         translate_fauto_xy(AUTOMATION_CAMERA_X, dx, dy, all);
 542 }
 543
 544 void Tracks::crop_resize(float x, float y, float z)
 545 {
 546         float ctr_x = edl->session->output_w / 2.;
 547         float ctr_y = edl->session->output_h / 2.;
 548         Track *track = first;
 549         for( ; track; track=track->next ) {
 550                 if( !track->is_armed() ) continue;
 551                 if( track->data_type != TRACK_VIDEO ) continue;
 552                 float px, py, pz;
 553                 track->get_projector(px, py, pz);
 554                 float old_x = px + ctr_x;
 555                 float old_y = py + ctr_y;
 556                 float nx = (old_x - x) * z;
 557                 float ny = (old_y - y) * z;
 558                 track->set_projector(nx, ny, pz * z);
 559         }
 560 }
 561
 562 void Tracks::crop_shrink(float x, float y, float z)
 563 {
 564         float ctr_x = edl->session->output_w / 2.;
 565         float ctr_y = edl->session->output_h / 2.;
 566         Track *track = first;
 567         for( ; track; track=track->next ) {
 568                 if( !track->is_armed() ) continue;
 569                 if( track->data_type != TRACK_VIDEO ) continue;
 570                 float cx, cy, cz, px, py, pz;
 571                 track->get_camera(cx, cy, cz);
 572                 track->get_projector(px, py, pz);
 573                 float dx = x - (px + ctr_x);
 574                 float dy = y - (py + ctr_y);
 575                 cz *= pz;
 576                 cx += dx / cz;  cy += dy / cz;
 577                 track->set_camera(cx, cy, cz * z);
 578                 px += dx;  py += dy;
 579                 track->set_projector(px, py, 1 / z);
 580         }
 581 }
 582
 583 void Tracks::update_y_pixels(Theme *theme)
 584 {
 585 //      int y = -edl->local_session->track_start;
 586         int y = 0;
 587         for(Track *current = first; current; current = NEXT)
 588         {
 589 //printf("Tracks::update_y_pixels %d\n", y);
 590                 current->y_pixel = y;
 591                 if( current->is_hidden() ) continue;
 592                 y += current->vertical_span(theme);
 593         }
 594 }
 595
 596 int Tracks::dump(FILE *fp)
 597 {
 598         for(Track* current = first; current; current = NEXT)
 599         {
 600                 fprintf(fp,"  Track: %p\n", current);
 601                 current->dump(fp);
 602                 fprintf(fp,"\n");
 603         }
 604         return 0;
 605 }
 606
 607 void Tracks::select_all(int type,
 608                 int value)
 609 {
 610         for(Track* current = first; current; current = NEXT)
 611         {
 612                 double position = edl->local_session->get_selectionstart(1);
 613
 614                 if(type == PLAY) current->play = value;
 615                 if(type == RECORD) current->armed = value;
 616                 if(type == GANG) current->ganged = value;
 617                 if(type == DRAW) current->draw = value;
 618
 619                 if(type == MUTE)
 620                 {
 621                         ((IntAuto*)current->automation->autos[AUTOMATION_MUTE]->get_auto_for_editing(position))->value = value;
 622                 }
 623
 624                 if(type == EXPAND) current->expand_view = value;
 625         }
 626 }
 627
 628 // ===================================== file operations
 629
 630 int Tracks::popup_transition(int cursor_x, int cursor_y)
 631 {
 632         int result = 0;
 633         for(Track* current = first; current && !result; current = NEXT)
 634         {
 635                 result = current->popup_transition(cursor_x, cursor_y);
 636         }
 637         return result;
 638 }
 639
 640
 641 int Tracks::change_channels(int oldchannels, int newchannels)
 642 {
 643         for(Track *current = first; current; current = NEXT)
 644         { current->change_channels(oldchannels, newchannels); }
 645         return 0;
 646 }
 647
 648
 649
 650 int Tracks::totalpixels()
 651 {
 652         int result = 0;
 653         for(Track* current = first; current; current = NEXT)
 654         {
 655                 result += current->data_h;
 656         }
 657         return result;
 658 }
 659
 660 int Tracks::number_of(Track *track)
 661 {
 662         int i = 0;
 663         for(Track *current = first; current && current != track; current = NEXT)
 664         {
 665                 i++;
 666         }
 667         return i;
 668 }
 669
 670 Track* Tracks::number(int number)
 671 {
 672         Track *current;
 673         int i = 0;
 674         for(current = first; current && i < number; current = NEXT)
 675         {
 676                 i++;
 677         }
 678         return current;
 679 }
 680
 681 Track* Tracks::get_track_by_id(int id)
 682 {
 683         Track *track = edl->tracks->first;
 684         while( track && track->get_id() != id ) track = track->next;
 685         return track;
 686 }
 687
 688 int Tracks::total_playable_vtracks()
 689 {
 690         int result = 0;
 691         for(Track *current = first; current; current = NEXT)
 692         {
 693                 if(current->data_type == TRACK_VIDEO && current->play) result++;
 694         }
 695         return result;
 696 }
 697
 698 Plugin *Tracks::plugin_exists(int plugin_id)
 699 {
 700         if( plugin_id < 0 ) return 0;
 701         Plugin *plugin = 0;
 702         for( Track *track=first; !plugin && track; track=track->next ) {
 703                 plugin = track->plugin_exists(plugin_id);
 704         }
 705         return plugin;
 706 }
 707
 708 int Tracks::track_exists(Track *track)
 709 {
 710         for(Track *current = first; current; current = NEXT)
 711         {
 712                 if(current == track) return 1;
 713         }
 714         return 0;
 715 }
 716
 717 int Tracks::new_group(int id)
 718 {
 719         int count = 0;
 720         for( Track *track=first; track; track=track->next ) {
 721                 if( !track->is_armed() ) continue;
 722                 for( Edit *edit=track->edits->first; edit; edit=edit->next ) {
 723                         if( edit->group_id > 0 ) continue;
 724                         if( !edit->is_selected ) continue;
 725                         edit->group_id = id;
 726                         ++count;
 727                 }
 728         }
 729         return count;
 730 }
 731
 732 int Tracks::set_group_selected(int id, int v)
 733 {
 734         int count = 0;
 735         int gang = edl->session->gang_tracks != GANG_NONE ? 1 : 0;
 736         for( Track *track=first; track; track=track->next ) {
 737                 if( track->is_hidden() ) continue;
 738                 for( Edit *edit=track->edits->first; edit; edit=edit->next ) {
 739                         if( edit->group_id != id ) continue;
 740                         if( v < 0 ) v = !edit->is_selected ? 1 : 0;
 741                         edit->select_affected_edits(v, gang);
 742                         ++count;
 743                 }
 744         }
 745         return count;
 746 }
 747
 748 int Tracks::del_group(int id)
 749 {
 750         int count = 0;
 751         for( Track *track=first; track; track=track->next ) {
 752                 for( Edit *edit=track->edits->first; edit; edit=edit->next ) {
 753                         if( edit->group_id != id ) continue;
 754                         edit->is_selected = 1;
 755                         edit->group_id = 0;
 756                         ++count;
 757                 }
 758         }
 759         return count;
 760 }
 761
 762 Track *Tracks::get(int idx, int data_type)
 763 {
 764         for(Track *current = first; current; current = NEXT)
 765         {
 766                 if( current->data_type != data_type ) continue;
 767                 if( --idx < 0 ) return current;
 768         }
 769         return 0;
 770 }
 771
 772 void Tracks::move_tracks(Track *src, Track *dst, int n)
 773 {
 774         if( src == dst ) return;
 775         while( --n >= 0 && src ) {
 776                 Track *nxt = src->next;
 777                 change_modules(number_of(src), total(), 0);
 778                 for( Track *track=nxt; track; track=track->next )
 779                         change_modules(number_of(track), number_of(track)-1, 0);
 780                 remove_pointer(src);
 781                 int ndst = dst ? number_of(dst) : total();
 782                 insert_before(dst, src);
 783                 for( Track *track=last; track && track!=src; track=track->previous )
 784                         change_modules(number_of(track)-1, number_of(track), 0);
 785                 change_modules(total(), ndst, 0);
 786                 src = nxt;
 787         }
 788 }
 789
 790 double Tracks::align_timecodes()
 791 {
 792         double offset = -1;
 793         for( Track *track=first; track; track=track->next ) {
 794                 if( !track->is_armed() ) continue;
 795                 double early_offset = track->edits->early_timecode();
 796                 if( offset < 0 || offset > early_offset )
 797                         offset = early_offset;
 798         }
 799         if( offset >= 0 ) {
 800                 for( Track *track=first; track; track=track->next ) {
 801                         if( !track->is_armed() ) continue;
 802                         track->edits->align_timecodes(offset);
 803                 }
 804         }
 805         return offset;
 806 }
 807
 808 void Tracks::update_idxbl_length(int id, double dt)
 809 {
 810         for( Track *track=first; track; track=track->next ) {
 811                 if( !track->is_armed() ) continue;
 812                 int64_t du = track->to_units(dt,0);
 813                 track->edits->update_idxbl_length(id, du);
 814                 track->optimize();
 815         }
 816 }
 817