cinelerra-5.1/cinelerra/edits.C

   1
   2 /*
   3  * CINELERRA
   4  * Copyright (C) 2008-2017 Adam Williams <broadcast at earthling dot net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  */
  21
  22 #include "aedit.h"
  23 #include "asset.h"
  24 #include "assets.h"
  25 #include "automation.h"
  26 #include "bcsignals.h"
  27 #include "cache.h"
  28 #include "clip.h"
  29 #include "clipedls.h"
  30 #include "edit.h"
  31 #include "edits.h"
  32 #include "edl.h"
  33 #include "edlsession.h"
  34 #include "file.h"
  35 #include "filexml.h"
  36 #include "filesystem.h"
  37 #include "localsession.h"
  38 #include "plugin.h"
  39 #include "strategies.inc"
  40 #include "track.h"
  41 #include "transition.h"
  42 #include "transportque.inc"
  43
  44 #include <string.h>
  45
  46 Edits::Edits(EDL *edl, Track *track)
  47  : List<Edit>()
  48 {
  49         this->edl = edl;
  50         this->track = track;
  51 }
  52
  53 Edits::~Edits()
  54 {
  55 }
  56
  57
  58 void Edits::equivalent_output(Edits *edits, int64_t *result)
  59 {
  60 // For the case of plugin sets, a new plugin set may be created with
  61 // plugins only starting after 0.  We only want to restart brender at
  62 // the first plugin in this case.
  63         for(Edit *current = first, *that_current = edits->first;
  64                 current || that_current;
  65                 current = NEXT,
  66                 that_current = that_current->next)
  67         {
  68 //printf("Edits::equivalent_output 1 %d\n", *result);
  69                 if(!current && that_current)
  70                 {
  71                         int64_t position1 = length();
  72                         int64_t position2 = that_current->startproject;
  73                         if(*result < 0 || *result > MIN(position1, position2))
  74                                 *result = MIN(position1, position2);
  75                         break;
  76                 }
  77                 else
  78                 if(current && !that_current)
  79                 {
  80                         int64_t position1 = edits->length();
  81                         int64_t position2 = current->startproject;
  82                         if(*result < 0 || *result > MIN(position1, position2))
  83                                 *result = MIN(position1, position2);
  84                         break;
  85                 }
  86                 else
  87                 {
  88 //printf("Edits::equivalent_output 2 %d\n", *result);
  89                         current->equivalent_output(that_current, result);
  90 //printf("Edits::equivalent_output 3 %d\n", *result);
  91                 }
  92         }
  93 }
  94
  95 void Edits::copy_from(Edits *edits)
  96 {
  97         while(last) delete last;
  98         for(Edit *current = edits->first; current; current = NEXT)
  99         {
 100                 Edit *new_edit = append(create_edit());
 101                 new_edit->copy_from(current);
 102         }
 103 }
 104
 105
 106 Edits& Edits::operator=(Edits& edits)
 107 {
 108 printf("Edits::operator= 1\n");
 109         copy_from(&edits);
 110         return *this;
 111 }
 112
 113
 114 void Edits::insert_asset(Asset *asset, EDL *nested_edl,
 115         int64_t length, int64_t position, int track_number)
 116 {
 117         Edit *new_edit = insert_new_edit(position);
 118
 119         new_edit->nested_edl = nested_edl;
 120         new_edit->asset = asset;
 121         new_edit->startsource = 0;
 122         new_edit->startproject = position;
 123         new_edit->length = length;
 124
 125         if(nested_edl)
 126         {
 127                 if(track->data_type == TRACK_AUDIO)
 128                         new_edit->channel = track_number % nested_edl->session->audio_channels;
 129                 else
 130                         new_edit->channel = 0;
 131         }
 132
 133         if(asset && !nested_edl)
 134         {
 135                 if(asset->audio_data)
 136                         new_edit->channel = track_number % asset->channels;
 137                 else
 138                 if(asset->video_data)
 139                         new_edit->channel = track_number % asset->layers;
 140         }
 141
 142 //printf("Edits::insert_asset %d %d\n", new_edit->channel, new_edit->length);
 143         for(Edit *current = new_edit->next; current; current = NEXT)
 144         {
 145                 current->startproject += length;
 146         }
 147 }
 148
 149 void Edits::insert_edits(Edits *source_edits,
 150         int64_t position,
 151         int64_t min_length,
 152         int edit_autos)
 153 {
 154         //int64_t clipboard_end = position + min_length;
 155 // Length pasted so far
 156         int64_t source_len = 0;
 157
 158 // Fill region between end of edit table and beginning of pasted segment
 159 // with silence.  Can't call from insert_new_edit because it's recursive.
 160         if(position > length())
 161         {
 162                 paste_silence(length(), position);
 163         }
 164
 165
 166         for(Edit *source_edit = source_edits->first;
 167                 source_edit;
 168                 source_edit = source_edit->next)
 169         {
 170                 EDL *dest_nested_edl = 0;
 171                 if(source_edit->nested_edl)
 172                         dest_nested_edl = edl->nested_edls.get_nested(source_edit->nested_edl);
 173
 174 // Update Assets
 175                 Asset *dest_asset = 0;
 176                 if(source_edit->asset)
 177                         dest_asset = edl->assets->update(source_edit->asset);
 178 // Open destination area
 179                 Edit *dest_edit = insert_new_edit(position + source_edit->startproject);
 180
 181                 dest_edit->clone_from(source_edit);
 182                 dest_edit->asset = dest_asset;
 183                 dest_edit->nested_edl = dest_nested_edl;
 184                 dest_edit->startproject = position + source_edit->startproject;
 185
 186
 187
 188 // Shift keyframes in source edit to their position in the
 189 // destination edit for plugin case
 190                 if(edit_autos) dest_edit->shift_keyframes(position);
 191
 192 // Shift following edits and keyframes in following edits by length
 193 // in current source edit.
 194                 for(Edit *future_edit = dest_edit->next;
 195                         future_edit;
 196                         future_edit = future_edit->next)
 197                 {
 198                         future_edit->startproject += dest_edit->length;
 199                         future_edit->shift_keyframes(dest_edit->length);
 200                 }
 201
 202                 source_len += source_edit->length;
 203         }
 204
 205
 206
 207
 208 // Fill remaining clipboard length with silence
 209         if(source_len < min_length)
 210         {
 211 //printf("Edits::insert_edits %d\n", __LINE__);
 212                 paste_silence(position + source_len, position + min_length);
 213         }
 214 }
 215
 216
 217 // Native units
 218 // Can't paste silence in here because it's used by paste_silence.
 219 Edit* Edits::insert_new_edit(int64_t position)
 220 {
 221 //printf("Edits::insert_new_edit 1\n");
 222         Edit *current = split_edit(position);
 223
 224 //printf("Edits::insert_new_edit 1\n");
 225         Edit *new_edit = create_edit();
 226         if( current ) current = PREVIOUS;
 227 //printf("Edits::insert_new_edit 1\n");
 228         insert_after(current, new_edit);
 229         new_edit->startproject = position;
 230 //printf("Edits::insert_new_edit 2\n");
 231         return new_edit;
 232 }
 233
 234 Edit* Edits::split_edit(int64_t position)
 235 {
 236 // Get edit containing position
 237         Edit *edit = editof(position, PLAY_FORWARD, 0);
 238         if(!edit) return 0;
 239 // Split would have created a 0 length
 240 //      if(edit->startproject == position) return edit;
 241 // Create anyway so the return value comes before position
 242
 243         Edit *new_edit = create_edit();
 244         insert_after(edit, new_edit);
 245         new_edit->clone_from(edit);
 246         new_edit->length = new_edit->startproject + new_edit->length - position;
 247         edit->length = position - edit->startproject;
 248         if( !new_edit->length || edit->silence() )
 249                 new_edit->hard_left = new_edit->hard_right = 0;
 250         else if( !edit->length )
 251                 edit->hard_left = edit->hard_right = 0;
 252         else {
 253                 new_edit->hard_right = edit->hard_right;
 254                 new_edit->hard_left = edit->hard_right = 0;
 255         }
 256         new_edit->startproject = position;
 257         new_edit->startsource += edit->length;
 258
 259 // Decide what to do with the transition
 260         if(edit->length && edit->transition) {
 261                 delete new_edit->transition;
 262                 new_edit->transition = 0;
 263         }
 264
 265         if(edit->transition && edit->transition->length > edit->length)
 266                 edit->transition->length = edit->length;
 267         if(new_edit->transition && new_edit->transition->length > new_edit->length)
 268                 new_edit->transition->length = new_edit->length;
 269         return new_edit;
 270 }
 271
 272 int Edits::save(FileXML *xml, const char *output_path)
 273 {
 274         copy(0, length(), xml, output_path);
 275         return 0;
 276 }
 277
 278 void Edits::resample(double old_rate, double new_rate)
 279 {
 280         for(Edit *current = first; current; current = NEXT)
 281         {
 282                 current->startproject = Units::to_int64((double)current->startproject /
 283                         old_rate *
 284                         new_rate);
 285                 if(PREVIOUS) PREVIOUS->length = current->startproject - PREVIOUS->startproject;
 286                 current->startsource = Units::to_int64((double)current->startsource /
 287                         old_rate *
 288                         new_rate);
 289                 if(!NEXT) current->length = Units::to_int64((double)current->length /
 290                         old_rate *
 291                         new_rate);
 292                 if(current->transition)
 293                 {
 294                         current->transition->length = Units::to_int64(
 295                                 (double)current->transition->length /
 296                                 old_rate *
 297                                 new_rate);
 298                 }
 299                 current->resample(old_rate, new_rate);
 300         }
 301 }
 302
 303 int Edits::is_glitch(Edit *edit)
 304 {
 305         if( track->data_type != TRACK_AUDIO ) return 0;
 306         int64_t threshold = edl->session->frame_rate > 0 ?
 307                 0.5 * edl->session->sample_rate / edl->session->frame_rate : 0;
 308 // audio edit shorter than .5 frames is a glitch
 309         return edit->length < threshold ? 1 : 0;
 310 }
 311
 312 int Edits::optimize()
 313 {
 314         int result = 1;
 315         Edit *current;
 316
 317 //printf("Edits::optimize %d\n", __LINE__);
 318 // Sort edits by starting point
 319         while(result)
 320         {
 321                 result = 0;
 322
 323                 for(current = first; current; current = NEXT)
 324                 {
 325                         Edit *next_edit = NEXT;
 326
 327                         if(next_edit && next_edit->startproject < current->startproject)
 328                         {
 329                                 swap(next_edit, current);
 330                                 result = 1;
 331                         }
 332                 }
 333         }
 334
 335 // trim edits before position 0
 336         while( first && first->startproject+first->length < 0 )
 337                 delete first;
 338         if( first && first->startproject < 0 ) {
 339                 first->length += first->startproject;
 340                 first->startproject = 0;
 341         }
 342
 343 // Insert silence between edits which aren't consecutive
 344         for(current = last; current; current = current->previous)
 345         {
 346                 if(current->previous)
 347                 {
 348                         Edit *previous_edit = current->previous;
 349                         if(current->startproject -
 350                                 previous_edit->startproject -
 351                                 previous_edit->length > 0)
 352                         {
 353                                 Edit *new_edit = create_edit();
 354                                 insert_before(current, new_edit);
 355                                 new_edit->startproject = previous_edit->startproject + previous_edit->length;
 356                                 new_edit->length = current->startproject -
 357                                         previous_edit->startproject -
 358                                         previous_edit->length;
 359                         }
 360                 }
 361                 else
 362                 if(current->startproject > 0)
 363                 {
 364                         Edit *new_edit = create_edit();
 365                         insert_before(current, new_edit);
 366                         new_edit->length = current->startproject;
 367                 }
 368         }
 369
 370         result = 1;
 371         while(result) {
 372                 result = 0;
 373
 374 // delete 0 length edits
 375                 for( current = first; !result && current; ) {
 376                         Edit* prev = current->previous, *next = current->next;
 377                         if( current->length == 0 ) {
 378                                 if( next && current->transition && !next->transition) {
 379                                         next->transition = current->transition;
 380                                         next->transition->edit = next;
 381                                         current->transition = 0;
 382                                 }
 383                                 if( !current->silence() ) {
 384                                         if( current->hard_left && next && !next->silence() )
 385                                                 next->hard_left = 1;
 386                                         if( current->hard_right && prev && !prev->silence())
 387                                                 prev->hard_right = 1;
 388                                 }
 389                                 delete current;
 390                                 result = 1;
 391                                 break;
 392                         }
 393                         current = next;
 394                 }
 395
 396 // merge same files or transitions, and deglitch
 397                 if( !result && track->data_type != TRACK_SUBTITLE ) {
 398                         current = first;
 399                         if( current && !current->hard_right &&
 400                             current->next && !current->next->hard_left &&
 401                             is_glitch(current) ) {
 402 // if the first edit is a glitch, change it to silence
 403                                 current->asset = 0;
 404                                 current->nested_edl = 0;
 405                         }
 406                         Edit *next_edit = 0;
 407                         for( ; current && (next_edit=current->next); current=NEXT ) {
 408 // both edges are not hard edges
 409                                 if( current->hard_right || next_edit->hard_left )
 410                                         continue;
 411 // next edit is a glitch
 412                                 if( is_glitch(next_edit) )
 413                                         break;
 414 // both edits are silence & not a plugin
 415                                 if( !current->is_plugin() && current->silence() &&
 416                                     !next_edit->is_plugin() && next_edit->silence() )
 417                                         break;
 418 // source channels are identical & assets are identical
 419                                 if( !result && current->channel == next_edit->channel &&
 420                                     current->asset == next_edit->asset &&
 421                                     current->nested_edl == next_edit->nested_edl ) {
 422 //  and stop and start in the same frame
 423                                         int64_t current_end = current->startsource + current->length;
 424                                         int64_t next_start = next_edit->startsource;
 425                                         if( current_end == next_start ||
 426                                             EQUIV(edl->frame_align(track->from_units(current_end), 1),
 427                                                   edl->frame_align(track->from_units(next_start), 1)) )
 428                                                 break;
 429                                 }
 430                         }
 431                         if( next_edit ) {
 432                                 int64_t current_start = current->startproject;
 433                                 int64_t next_end = next_edit->startproject + next_edit->length;
 434                                 current->length = next_end - current_start;
 435                                 current->hard_right = next_edit->hard_right;
 436                                 remove(next_edit);
 437                                 result = 1;
 438                         }
 439                 }
 440
 441                 if( last && last->silence() &&
 442                     !last->transition && !last->hard_left && !last->hard_right ) {
 443                         delete last;
 444                         result = 1;
 445                 }
 446         }
 447
 448         return 0;
 449 }
 450
 451
 452 // ===================================== file operations
 453
 454 void Edits::load(FileXML *file, int track_offset)
 455 {
 456         int64_t startproject = 0;
 457
 458         while( last ) delete last;
 459
 460         while( !file->read_tag() ) {
 461 //printf("Edits::load 1 %s\n", file->tag.get_title());
 462                 if(!strcmp(file->tag.get_title(), "EDIT")) {
 463                         load_edit(file, startproject, track_offset);
 464                 }
 465                 else if(!strcmp(file->tag.get_title(), "/EDITS"))
 466                         break;
 467         }
 468
 469 //track->dump();
 470         optimize();
 471 }
 472
 473 int Edits::load_edit(FileXML *file, int64_t &startproject, int track_offset)
 474 {
 475         Edit* current = append_new_edit();
 476         current->load_properties(file, startproject);
 477
 478         startproject += current->length;
 479
 480         while( !file->read_tag() ) {
 481                 if(file->tag.title_is("NESTED_EDL")) {
 482                         char path[BCTEXTLEN];
 483                         path[0] = 0;
 484                         file->tag.get_property("SRC", path);
 485 //printf("Edits::load_edit %d path=%s\n", __LINE__, path);
 486                         if(path[0] != 0) {
 487                                 current->nested_edl = edl->nested_edls.load(path);
 488                         }
 489 // printf("Edits::load_edit %d nested_edl->path=%s\n",
 490 // __LINE__, current->nested_edl->path);
 491                 }
 492                 else if(file->tag.title_is("FILE")) {
 493                         char filename[BCTEXTLEN];
 494                         filename[0] = 0;
 495                         file->tag.get_property("SRC", filename);
 496 // Extend path
 497                         if(filename[0] != 0) {
 498                                 char directory[BCTEXTLEN], edl_directory[BCTEXTLEN];
 499                                 FileSystem fs;
 500                                 fs.set_current_dir("");
 501                                 fs.extract_dir(directory, filename);
 502                                 if(!strlen(directory)) {
 503                                         fs.extract_dir(edl_directory, file->filename);
 504                                         fs.join_names(directory, edl_directory, filename);
 505                                         strcpy(filename, directory);
 506                                 }
 507                                 current->asset = edl->assets->get_asset(filename);
 508                         }
 509                         else {
 510                                 current->asset = 0;
 511                         }
 512 //printf("Edits::load_edit 5\n");
 513                 }
 514                 else if(file->tag.title_is("TRANSITION")) {
 515                         current->transition = new Transition(edl, current, "",
 516                                 track->to_units(edl->session->default_transition_length, 1));
 517                                 current->transition->load_xml(file);
 518                 }
 519                 else if(file->tag.title_is("/EDIT"))
 520                         break;
 521         }
 522
 523 //printf("Edits::load_edit %d\n", __LINE__);
 524 //track->dump();
 525 //printf("Edits::load_edit %d\n", __LINE__);
 526         return 0;
 527 }
 528
 529 // ============================================= accounting
 530
 531 int64_t Edits::length()
 532 {
 533         return last ? last->startproject + last->length : 0;
 534 }
 535
 536
 537
 538 Edit* Edits::editof(int64_t position, int direction, int use_nudge)
 539 {
 540         Edit *current = 0;
 541         if(use_nudge && track) position += track->nudge;
 542
 543         if(direction == PLAY_FORWARD) {
 544                 for(current = last; current; current = PREVIOUS) {
 545                         if(current->startproject <= position && current->startproject + current->length > position)
 546                                 return current;
 547                 }
 548         }
 549         else
 550         if(direction == PLAY_REVERSE) {
 551                 for(current = first; current; current = NEXT) {
 552                         if(current->startproject < position && current->startproject + current->length >= position)
 553                                 return current;
 554                 }
 555         }
 556
 557         return 0;     // return 0 on failure
 558 }
 559
 560 Edit* Edits::get_playable_edit(int64_t position, int use_nudge)
 561 {
 562         Edit *current;
 563         if(track && use_nudge) position += track->nudge;
 564
 565 // Get the current edit
 566         for(current = first; current; current = NEXT) {
 567                 if(current->startproject <= position &&
 568                         current->startproject + current->length > position)
 569                         break;
 570         }
 571
 572 // Get the edit's asset
 573 // TODO: descend into nested EDLs
 574         if(current) {
 575                 if(!current->asset)
 576                         current = 0;
 577         }
 578
 579         return current;     // return 0 on failure
 580 }
 581
 582 // ================================================ editing
 583
 584
 585
 586 int Edits::copy(int64_t start, int64_t end, FileXML *file, const char *output_path)
 587 {
 588         Edit *current_edit;
 589
 590         file->tag.set_title("EDITS");
 591         file->append_tag();
 592         file->append_newline();
 593
 594         for(current_edit = first; current_edit; current_edit = current_edit->next)
 595         {
 596                 current_edit->copy(start, end, file, output_path);
 597         }
 598
 599         file->tag.set_title("/EDITS");
 600         file->append_tag();
 601         file->append_newline();
 602         return 0;
 603 }
 604
 605
 606
 607 void Edits::clear(int64_t start, int64_t end)
 608 {
 609         if( start >= end ) return;
 610
 611         Edit* edit1 = editof(start, PLAY_FORWARD, 0);
 612         Edit* edit2 = editof(end, PLAY_FORWARD, 0);
 613         Edit* current_edit;
 614
 615         if(end == start) return;        // nothing selected
 616         if(!edit1 && !edit2) return;       // nothing selected
 617
 618
 619         if(!edit2) {                // edit2 beyond end of track
 620                 edit2 = last;
 621                 end = this->length();
 622         }
 623
 624         if( edit1 && edit2 && edit1 != edit2)
 625         {
 626 // in different edits
 627
 628 //printf("Edits::clear 3.5 %d %d %d %d\n", edit1->startproject, edit1->length, edit2->startproject, edit2->length);
 629                 edit1->length = start - edit1->startproject;
 630                 edit2->length -= end - edit2->startproject;
 631                 edit2->startsource += end - edit2->startproject;
 632                 edit2->startproject += end - edit2->startproject;
 633
 634 // delete
 635                 for(current_edit = edit1->next; current_edit && current_edit != edit2;) {
 636                         Edit* next = current_edit->next;
 637                         remove(current_edit);
 638                         current_edit = next;
 639                 }
 640 // shift
 641                 for(current_edit = edit2; current_edit; current_edit = current_edit->next) {
 642                         current_edit->startproject -= end - start;
 643                 }
 644         }
 645         else {
 646 // in same edit. paste_edit depends on this
 647 // create a new edit
 648                 current_edit = split_edit(start);
 649                 if( current_edit ) {
 650                         current_edit->length -= end - start;
 651                         current_edit->startsource += end - start;
 652 // shift
 653                         while( (current_edit=current_edit->next) != 0 ) {
 654                                 current_edit->startproject -= end - start;
 655                         }
 656                 }
 657         }
 658
 659         optimize();
 660 }
 661
 662 // Used by edit handle and plugin handle movement but plugin handle movement
 663 // can only effect other plugins.
 664 void Edits::clear_recursive(int64_t start, int64_t end,
 665         int edit_edits, int edit_labels, int edit_plugins, int edit_autos,
 666         Edits *trim_edits)
 667 {
 668 //printf("Edits::clear_recursive 1\n");
 669         track->clear(start, end,
 670                 edit_edits, edit_labels, edit_plugins, edit_autos, trim_edits);
 671 }
 672
 673
 674 int Edits::clear_handle(double start, double end,
 675         int edit_plugins, int edit_autos, double &distance)
 676 {
 677         Edit *current_edit;
 678
 679         distance = 0.0; // if nothing is found, distance is 0!
 680         for(current_edit = first;
 681                 current_edit && current_edit->next;
 682                 current_edit = current_edit->next) {
 683
 684
 685
 686                 if(current_edit->asset && current_edit->next->asset) {
 687
 688                         if(current_edit->asset->equivalent(*current_edit->next->asset, 0, 0, edl)) {
 689
 690 // Got two consecutive edits in same source
 691                                 if(edl->equivalent(track->from_units(current_edit->next->startproject),
 692                                         start)) {
 693 // handle selected
 694                                         int length = -current_edit->length;
 695                                         current_edit->length = current_edit->next->startsource - current_edit->startsource;
 696                                         length += current_edit->length;
 697
 698 // Lengthen automation
 699                                         if(edit_autos)
 700                                                 track->automation->paste_silence(current_edit->next->startproject,
 701                                                         current_edit->next->startproject + length);
 702
 703 // Lengthen effects
 704                                         if(edit_plugins)
 705                                                 track->shift_effects(current_edit->next->startproject,
 706                                                                 length, edit_autos, 0);
 707
 708                                         for(current_edit = current_edit->next; current_edit; current_edit = current_edit->next)
 709                                         {
 710                                                 current_edit->startproject += length;
 711                                         }
 712
 713                                         distance = track->from_units(length);
 714                                         optimize();
 715                                         break;
 716                                 }
 717                         }
 718                 }
 719         }
 720
 721         return 0;
 722 }
 723
 724 int Edits::modify_handles(double oldposition, double newposition, int currentend,
 725         int edit_mode, int edit_edits, int edit_labels, int edit_plugins, int edit_autos,
 726         Edits *trim_edits, int group_id)
 727 {
 728         int result = 0;
 729         Edit *current_edit;
 730         Edit *left = 0, *right = 0;
 731         if( group_id > 0 ) {
 732                 double start = DBL_MAX, end = DBL_MIN;
 733                 for( Edit *edit=first; edit; edit=edit->next ) {
 734                         if( edit->group_id != group_id ) continue;
 735                         double edit_start = edit->track->from_units(edit->startproject);
 736                         if( edit_start < start ) { start = edit_start;  left = edit; }
 737                         double edit_end = edit->track->from_units(edit->startproject+edit->length);
 738                         if( edit_end > end ) { end = edit_end;  right = edit; }
 739                 }
 740         }
 741
 742 //printf("Edits::modify_handles 1 %d %f %f\n", currentend, newposition, oldposition);
 743         if(currentend == 0) {
 744 // left handle
 745                 for(current_edit = first; current_edit && !result;) {
 746                         if( group_id > 0 ? current_edit == left :
 747                             edl->equivalent(track->from_units(current_edit->startproject),
 748                                 oldposition) ) {
 749 // edit matches selection
 750 //printf("Edits::modify_handles 3 %f %f\n", newposition, oldposition);
 751                                 double delta = newposition - oldposition;
 752                                 oldposition = track->from_units(current_edit->startproject);
 753                                 if( group_id > 0 ) newposition = oldposition + delta;
 754                                 current_edit->shift_start(edit_mode,
 755                                         track->to_units(newposition, 0), track->to_units(oldposition, 0),
 756                                         edit_labels, edit_autos, edit_plugins, trim_edits);
 757                                 result = 1;
 758                         }
 759
 760                         if(!result) current_edit = current_edit->next;
 761                 }
 762         }
 763         else {
 764 // right handle selected
 765                 for(current_edit = first; current_edit && !result;) {
 766                         if( group_id > 0 ? current_edit == right :
 767                             edl->equivalent(track->from_units(current_edit->startproject) +
 768                                         track->from_units(current_edit->length), oldposition) ) {
 769                                 double delta = newposition - oldposition;
 770                                 oldposition = track->from_units(current_edit->startproject) +
 771                                         track->from_units(current_edit->length);
 772                                 if( group_id > 0 ) newposition = oldposition + delta;
 773                                 result = 1;
 774
 775                                 current_edit->shift_end(edit_mode,
 776                                         track->to_units(newposition, 0), track->to_units(oldposition, 0),
 777                                         edit_labels, edit_autos, edit_plugins, trim_edits);
 778                         }
 779
 780                         if(!result) current_edit = current_edit->next;
 781 //printf("Edits::modify_handle 8\n");
 782                 }
 783         }
 784
 785         optimize();
 786         return 0;
 787 }
 788
 789 void Edits::paste_silence(int64_t start, int64_t end)
 790 {
 791         Edit *new_edit = editof(start, PLAY_FORWARD, 0);
 792         if (!new_edit) return;
 793
 794         if( !new_edit->silence() || new_edit->hard_right ) {
 795                 new_edit = insert_new_edit(start);
 796                 new_edit->length = end - start;
 797         }
 798         else
 799                 new_edit->length += end - start;
 800
 801         for(Edit *current = new_edit->next; current; current = NEXT) {
 802                 current->startproject += end - start;
 803         }
 804
 805         return;
 806 }
 807
 808 Edit *Edits::create_silence(int64_t start, int64_t end)
 809 {
 810         Edit *new_edit = insert_new_edit(start);
 811         new_edit->length = end - start;
 812         for(Edit *current = new_edit->next; current; current = NEXT) {
 813                 current->startproject += end - start;
 814         }
 815         return new_edit;
 816 }
 817
 818 Edit* Edits::shift(int64_t position, int64_t difference)
 819 {
 820         Edit *new_edit = split_edit(position);
 821
 822         for(Edit *current = first; current; current = NEXT) {
 823                 if(current->startproject >= position) {
 824                         current->shift(difference);
 825                 }
 826         }
 827         return new_edit;
 828 }
 829
 830
 831 void Edits::shift_keyframes_recursive(int64_t position, int64_t length)
 832 {
 833         track->shift_keyframes(position, length);
 834 }
 835
 836 void Edits::shift_effects_recursive(int64_t position, int64_t length, int edit_autos)
 837 {
 838         track->shift_effects(position, length, edit_autos, 0);
 839 }
 840