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->copy_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 ) new_edit->hard_right = current->hard_left;
 227         if( current ) current = PREVIOUS;
 228         if( current ) new_edit->hard_left = current->hard_right;
 229 //printf("Edits::insert_new_edit 1\n");
 230         insert_after(current, new_edit);
 231         new_edit->startproject = position;
 232 //printf("Edits::insert_new_edit 2\n");
 233         return new_edit;
 234 }
 235
 236 Edit* Edits::split_edit(int64_t position)
 237 {
 238 // Get edit containing position
 239         Edit *edit = editof(position, PLAY_FORWARD, 0);
 240         if(!edit) return 0;
 241 // Split would have created a 0 length
 242 //      if(edit->startproject == position) return edit;
 243 // Create anyway so the return value comes before position
 244
 245         Edit *new_edit = create_edit();
 246         insert_after(edit, new_edit);
 247         new_edit->copy_from(edit);
 248         new_edit->length = new_edit->startproject + new_edit->length - position;
 249         edit->length = position - edit->startproject;
 250         new_edit->startproject = position;
 251         new_edit->startsource += edit->length;
 252
 253 // Decide what to do with the transition
 254         if(edit->length && edit->transition) {
 255                 delete new_edit->transition;
 256                 new_edit->transition = 0;
 257         }
 258
 259         if(edit->transition && edit->transition->length > edit->length)
 260                 edit->transition->length = edit->length;
 261         if(new_edit->transition && new_edit->transition->length > new_edit->length)
 262                 new_edit->transition->length = new_edit->length;
 263         return new_edit;
 264 }
 265
 266 int Edits::save(FileXML *xml, const char *output_path)
 267 {
 268         copy(0, length(), xml, output_path);
 269         return 0;
 270 }
 271
 272 void Edits::resample(double old_rate, double new_rate)
 273 {
 274         for(Edit *current = first; current; current = NEXT)
 275         {
 276                 current->startproject = Units::to_int64((double)current->startproject /
 277                         old_rate *
 278                         new_rate);
 279                 if(PREVIOUS) PREVIOUS->length = current->startproject - PREVIOUS->startproject;
 280                 current->startsource = Units::to_int64((double)current->startsource /
 281                         old_rate *
 282                         new_rate);
 283                 if(!NEXT) current->length = Units::to_int64((double)current->length /
 284                         old_rate *
 285                         new_rate);
 286                 if(current->transition)
 287                 {
 288                         current->transition->length = Units::to_int64(
 289                                 (double)current->transition->length /
 290                                 old_rate *
 291                                 new_rate);
 292                 }
 293                 current->resample(old_rate, new_rate);
 294         }
 295 }
 296
 297 int Edits::is_glitch(Edit *edit)
 298 {
 299         if( track->data_type != TRACK_AUDIO ) return 0;
 300         int64_t threshold = edl->session->frame_rate > 0 ?
 301                 0.5 * edl->session->sample_rate / edl->session->frame_rate : 0;
 302 // audio edit shorter than .5 frames is a glitch
 303         return edit->length < threshold ? 1 : 0;
 304 }
 305
 306 int Edits::optimize()
 307 {
 308         int result = 1;
 309         Edit *current;
 310
 311 //printf("Edits::optimize %d\n", __LINE__);
 312 // Sort edits by starting point
 313         while(result)
 314         {
 315                 result = 0;
 316
 317                 for(current = first; current; current = NEXT)
 318                 {
 319                         Edit *next_edit = NEXT;
 320
 321                         if(next_edit && next_edit->startproject < current->startproject)
 322                         {
 323                                 swap(next_edit, current);
 324                                 result = 1;
 325                         }
 326                 }
 327         }
 328
 329 // trim edits before position 0
 330         while( first && first->startproject+first->length < 0 )
 331                 delete first;
 332         if( first && first->startproject < 0 ) {
 333                 first->length += first->startproject;
 334                 first->startproject = 0;
 335         }
 336
 337 // Insert silence between edits which aren't consecutive
 338         for(current = last; current; current = current->previous)
 339         {
 340                 if(current->previous)
 341                 {
 342                         Edit *previous_edit = current->previous;
 343                         if(current->startproject -
 344                                 previous_edit->startproject -
 345                                 previous_edit->length > 0)
 346                         {
 347                                 Edit *new_edit = create_edit();
 348                                 insert_before(current, new_edit);
 349                                 new_edit->startproject = previous_edit->startproject + previous_edit->length;
 350                                 new_edit->length = current->startproject -
 351                                         previous_edit->startproject -
 352                                         previous_edit->length;
 353                         }
 354                 }
 355                 else
 356                 if(current->startproject > 0)
 357                 {
 358                         Edit *new_edit = create_edit();
 359                         insert_before(current, new_edit);
 360                         new_edit->length = current->startproject;
 361                 }
 362         }
 363
 364         result = 1;
 365         while(result) {
 366                 result = 0;
 367
 368 // delete 0 length edits
 369                 for( current = first; !result && current; ) {
 370                         Edit* next = current->next;
 371                         if( current->length == 0 ) {
 372                                 if( next && current->transition && !next->transition) {
 373                                         next->transition = current->transition;
 374                                         next->transition->edit = next;
 375                                         current->transition = 0;
 376                                 }
 377                                 delete current;
 378                                 result = 1;
 379                                 break;
 380                         }
 381                         current = next;
 382                 }
 383
 384 // merge same files or transitions, and deglitch
 385                 if( !result && track->data_type != TRACK_SUBTITLE ) {
 386                         current = first;
 387                         if( current && !current->hard_right &&
 388                             current->next && !current->next->hard_left &&
 389                             is_glitch(current) ) {
 390 // if the first edit is a glitch, change it to silence
 391                                 current->asset = 0;
 392                                 current->nested_edl = 0;
 393                         }
 394                         Edit *next_edit = 0;
 395                         for( ; current && (next_edit=current->next); current=NEXT ) {
 396 // both edges are not hard edges
 397                                 if( current->hard_right || next_edit->hard_left ) continue;
 398 // next edit is a glitch
 399                                 if( is_glitch(next_edit) )
 400                                         break;
 401 // both edits are silence & not a plugin
 402                                 if( !current->is_plugin && current->silence() &&
 403                                     !next_edit->is_plugin && next_edit->silence() )
 404                                         break;
 405 // source channels are identical & assets are identical
 406                                 if( !result && current->channel == next_edit->channel &&
 407                                     current->asset == next_edit->asset &&
 408                                     current->nested_edl == next_edit->nested_edl ) {
 409 //  and stop and start in the same frame
 410                                         int64_t current_end = current->startsource + current->length;
 411                                         int64_t next_start = next_edit->startsource;
 412                                         if( current_end == next_start ||
 413                                             EQUIV(edl->frame_align(track->from_units(current_end), 1),
 414                                                   edl->frame_align(track->from_units(next_start), 1)) )
 415                                                 break;
 416                                 }
 417                         }
 418                         if( next_edit ) {
 419                                 int64_t current_start = current->startproject;
 420                                 int64_t next_end = next_edit->startproject + next_edit->length;
 421                                 current->length = next_end - current_start;
 422                                 current->hard_right = next_edit->hard_right;
 423                                 remove(next_edit);
 424                                 result = 1;
 425                         }
 426                 }
 427
 428                 if( last && last->silence() &&
 429                     !last->transition && !last->hard_left && !last->hard_right ) {
 430                         delete last;
 431                         result = 1;
 432                 }
 433         }
 434
 435         return 0;
 436 }
 437
 438
 439 // ===================================== file operations
 440
 441 void Edits::load(FileXML *file, int track_offset)
 442 {
 443         int64_t startproject = 0;
 444
 445         while( last ) delete last;
 446
 447         while( !file->read_tag() ) {
 448 //printf("Edits::load 1 %s\n", file->tag.get_title());
 449                 if(!strcmp(file->tag.get_title(), "EDIT")) {
 450                         load_edit(file, startproject, track_offset);
 451                 }
 452                 else if(!strcmp(file->tag.get_title(), "/EDITS"))
 453                         break;
 454         }
 455
 456 //track->dump();
 457         optimize();
 458 }
 459
 460 int Edits::load_edit(FileXML *file, int64_t &startproject, int track_offset)
 461 {
 462         Edit* current = append_new_edit();
 463         current->load_properties(file, startproject);
 464
 465         startproject += current->length;
 466
 467         while( !file->read_tag() ) {
 468                 if(file->tag.title_is("NESTED_EDL")) {
 469                         char path[BCTEXTLEN];
 470                         path[0] = 0;
 471                         file->tag.get_property("SRC", path);
 472 //printf("Edits::load_edit %d path=%s\n", __LINE__, path);
 473                         if(path[0] != 0) {
 474                                 current->nested_edl = edl->nested_edls.load(path);
 475                         }
 476 // printf("Edits::load_edit %d nested_edl->path=%s\n",
 477 // __LINE__, current->nested_edl->path);
 478                 }
 479                 else if(file->tag.title_is("FILE")) {
 480                         char filename[BCTEXTLEN];
 481                         filename[0] = 0;
 482                         file->tag.get_property("SRC", filename);
 483 // Extend path
 484                         if(filename[0] != 0) {
 485                                 char directory[BCTEXTLEN], edl_directory[BCTEXTLEN];
 486                                 FileSystem fs;
 487                                 fs.set_current_dir("");
 488                                 fs.extract_dir(directory, filename);
 489                                 if(!strlen(directory)) {
 490                                         fs.extract_dir(edl_directory, file->filename);
 491                                         fs.join_names(directory, edl_directory, filename);
 492                                         strcpy(filename, directory);
 493                                 }
 494                                 current->asset = edl->assets->get_asset(filename);
 495                         }
 496                         else {
 497                                 current->asset = 0;
 498                         }
 499 //printf("Edits::load_edit 5\n");
 500                 }
 501                 else if(file->tag.title_is("TRANSITION")) {
 502                         current->transition = new Transition(edl, current, "",
 503                                 track->to_units(edl->session->default_transition_length, 1));
 504                                 current->transition->load_xml(file);
 505                 }
 506                 else if(file->tag.title_is("/EDIT"))
 507                         break;
 508         }
 509
 510 //printf("Edits::load_edit %d\n", __LINE__);
 511 //track->dump();
 512 //printf("Edits::load_edit %d\n", __LINE__);
 513         return 0;
 514 }
 515
 516 // ============================================= accounting
 517
 518 int64_t Edits::length()
 519 {
 520         return last ? last->startproject + last->length : 0;
 521 }
 522
 523
 524
 525 Edit* Edits::editof(int64_t position, int direction, int use_nudge)
 526 {
 527         Edit *current = 0;
 528         if(use_nudge && track) position += track->nudge;
 529
 530         if(direction == PLAY_FORWARD) {
 531                 for(current = last; current; current = PREVIOUS) {
 532                         if(current->startproject <= position && current->startproject + current->length > position)
 533                                 return current;
 534                 }
 535         }
 536         else
 537         if(direction == PLAY_REVERSE) {
 538                 for(current = first; current; current = NEXT) {
 539                         if(current->startproject < position && current->startproject + current->length >= position)
 540                                 return current;
 541                 }
 542         }
 543
 544         return 0;     // return 0 on failure
 545 }
 546
 547 Edit* Edits::get_playable_edit(int64_t position, int use_nudge)
 548 {
 549         Edit *current;
 550         if(track && use_nudge) position += track->nudge;
 551
 552 // Get the current edit
 553         for(current = first; current; current = NEXT) {
 554                 if(current->startproject <= position &&
 555                         current->startproject + current->length > position)
 556                         break;
 557         }
 558
 559 // Get the edit's asset
 560 // TODO: descend into nested EDLs
 561         if(current) {
 562                 if(!current->asset)
 563                         current = 0;
 564         }
 565
 566         return current;     // return 0 on failure
 567 }
 568
 569 // ================================================ editing
 570
 571
 572
 573 int Edits::copy(int64_t start, int64_t end, FileXML *file, const char *output_path)
 574 {
 575         Edit *current_edit;
 576
 577         file->tag.set_title("EDITS");
 578         file->append_tag();
 579         file->append_newline();
 580
 581         for(current_edit = first; current_edit; current_edit = current_edit->next)
 582         {
 583                 current_edit->copy(start, end, file, output_path);
 584         }
 585
 586         file->tag.set_title("/EDITS");
 587         file->append_tag();
 588         file->append_newline();
 589         return 0;
 590 }
 591
 592
 593
 594 void Edits::clear(int64_t start, int64_t end)
 595 {
 596         if( start >= end ) return;
 597
 598         Edit* edit1 = editof(start, PLAY_FORWARD, 0);
 599         Edit* edit2 = editof(end, PLAY_FORWARD, 0);
 600         Edit* current_edit;
 601
 602         if(end == start) return;        // nothing selected
 603         if(!edit1 && !edit2) return;       // nothing selected
 604
 605
 606         if(!edit2) {                // edit2 beyond end of track
 607                 edit2 = last;
 608                 end = this->length();
 609         }
 610
 611         if( edit1 && edit2 && edit1 != edit2)
 612         {
 613 // in different edits
 614
 615 //printf("Edits::clear 3.5 %d %d %d %d\n", edit1->startproject, edit1->length, edit2->startproject, edit2->length);
 616                 edit1->length = start - edit1->startproject;
 617                 edit2->length -= end - edit2->startproject;
 618                 edit2->startsource += end - edit2->startproject;
 619                 edit2->startproject += end - edit2->startproject;
 620
 621 // delete
 622                 for(current_edit = edit1->next; current_edit && current_edit != edit2;) {
 623                         Edit* next = current_edit->next;
 624                         remove(current_edit);
 625                         current_edit = next;
 626                 }
 627 // shift
 628                 for(current_edit = edit2; current_edit; current_edit = current_edit->next) {
 629                         current_edit->startproject -= end - start;
 630                 }
 631         }
 632         else {
 633 // in same edit. paste_edit depends on this
 634 // create a new edit
 635                 current_edit = split_edit(start);
 636                 if( current_edit ) {
 637                         current_edit->length -= end - start;
 638                         current_edit->startsource += end - start;
 639 // shift
 640                         while( (current_edit=current_edit->next) != 0 ) {
 641                                 current_edit->startproject -= end - start;
 642                         }
 643                 }
 644         }
 645
 646         optimize();
 647 }
 648
 649 // Used by edit handle and plugin handle movement but plugin handle movement
 650 // can only effect other plugins.
 651 void Edits::clear_recursive(int64_t start, int64_t end,
 652         int edit_edits, int edit_labels, int edit_plugins, int edit_autos,
 653         Edits *trim_edits)
 654 {
 655 //printf("Edits::clear_recursive 1\n");
 656         track->clear(start, end,
 657                 edit_edits, edit_labels, edit_plugins, edit_autos, trim_edits);
 658 }
 659
 660
 661 int Edits::clear_handle(double start, double end,
 662         int edit_plugins, int edit_autos, double &distance)
 663 {
 664         Edit *current_edit;
 665
 666         distance = 0.0; // if nothing is found, distance is 0!
 667         for(current_edit = first;
 668                 current_edit && current_edit->next;
 669                 current_edit = current_edit->next) {
 670
 671
 672
 673                 if(current_edit->asset && current_edit->next->asset) {
 674
 675                         if(current_edit->asset->equivalent(*current_edit->next->asset, 0, 0, edl)) {
 676
 677 // Got two consecutive edits in same source
 678                                 if(edl->equivalent(track->from_units(current_edit->next->startproject),
 679                                         start)) {
 680 // handle selected
 681                                         int length = -current_edit->length;
 682                                         current_edit->length = current_edit->next->startsource - current_edit->startsource;
 683                                         length += current_edit->length;
 684
 685 // Lengthen automation
 686                                         if(edit_autos)
 687                                                 track->automation->paste_silence(current_edit->next->startproject,
 688                                                         current_edit->next->startproject + length);
 689
 690 // Lengthen effects
 691                                         if(edit_plugins)
 692                                                 track->shift_effects(current_edit->next->startproject,
 693                                                                 length, edit_autos, 0);
 694
 695                                         for(current_edit = current_edit->next; current_edit; current_edit = current_edit->next)
 696                                         {
 697                                                 current_edit->startproject += length;
 698                                         }
 699
 700                                         distance = track->from_units(length);
 701                                         optimize();
 702                                         break;
 703                                 }
 704                         }
 705                 }
 706         }
 707
 708         return 0;
 709 }
 710
 711 int Edits::modify_handles(double oldposition, double newposition, int currentend,
 712         int edit_mode, int edit_edits, int edit_labels, int edit_plugins, int edit_autos,
 713         Edits *trim_edits, int group_id)
 714 {
 715         int result = 0;
 716         Edit *current_edit;
 717         Edit *left = 0, *right = 0;
 718         if( group_id > 0 ) {
 719                 double start = DBL_MAX, end = DBL_MIN;
 720                 for( Edit *edit=first; edit; edit=edit->next ) {
 721                         if( edit->group_id != group_id ) continue;
 722                         double edit_start = edit->track->from_units(edit->startproject);
 723                         if( edit_start < start ) { start = edit_start;  left = edit; }
 724                         double edit_end = edit->track->from_units(edit->startproject+edit->length);
 725                         if( edit_end > end ) { end = edit_end;  right = edit; }
 726                 }
 727         }
 728
 729 //printf("Edits::modify_handles 1 %d %f %f\n", currentend, newposition, oldposition);
 730         if(currentend == 0) {
 731 // left handle
 732                 for(current_edit = first; current_edit && !result;) {
 733                         if( group_id > 0 ? current_edit == left :
 734                             edl->equivalent(track->from_units(current_edit->startproject),
 735                                 oldposition) ) {
 736 // edit matches selection
 737 //printf("Edits::modify_handles 3 %f %f\n", newposition, oldposition);
 738                                 double delta = newposition - oldposition;
 739                                 oldposition = track->from_units(current_edit->startproject);
 740                                 if( group_id > 0 ) newposition = oldposition + delta;
 741                                 current_edit->shift_start(edit_mode,
 742                                         track->to_units(newposition, 0), track->to_units(oldposition, 0),
 743                                         edit_labels, edit_autos, edit_plugins, trim_edits);
 744                                 result = 1;
 745                         }
 746
 747                         if(!result) current_edit = current_edit->next;
 748                 }
 749         }
 750         else {
 751 // right handle selected
 752                 for(current_edit = first; current_edit && !result;) {
 753                         if( group_id > 0 ? current_edit == right :
 754                             edl->equivalent(track->from_units(current_edit->startproject) +
 755                                         track->from_units(current_edit->length), oldposition) ) {
 756                                 double delta = newposition - oldposition;
 757                                 oldposition = track->from_units(current_edit->startproject) +
 758                                         track->from_units(current_edit->length);
 759                                 if( group_id > 0 ) newposition = oldposition + delta;
 760                                 result = 1;
 761
 762                                 current_edit->shift_end(edit_mode,
 763                                         track->to_units(newposition, 0), track->to_units(oldposition, 0),
 764                                         edit_labels, edit_autos, edit_plugins, trim_edits);
 765                         }
 766
 767                         if(!result) current_edit = current_edit->next;
 768 //printf("Edits::modify_handle 8\n");
 769                 }
 770         }
 771
 772         optimize();
 773         return 0;
 774 }
 775
 776 void Edits::paste_silence(int64_t start, int64_t end)
 777 {
 778         Edit *new_edit = editof(start, PLAY_FORWARD, 0);
 779         if (!new_edit) return;
 780
 781         if( !new_edit->silence() || new_edit->hard_right ) {
 782                 new_edit = insert_new_edit(start);
 783                 new_edit->length = end - start;
 784         }
 785         else
 786                 new_edit->length += end - start;
 787
 788         for(Edit *current = new_edit->next; current; current = NEXT) {
 789                 current->startproject += end - start;
 790         }
 791
 792         return;
 793 }
 794
 795 Edit *Edits::create_silence(int64_t start, int64_t end)
 796 {
 797         Edit *new_edit = insert_new_edit(start);
 798         new_edit->length = end - start;
 799         for(Edit *current = new_edit->next; current; current = NEXT) {
 800                 current->startproject += end - start;
 801         }
 802         return new_edit;
 803 }
 804
 805 Edit* Edits::shift(int64_t position, int64_t difference)
 806 {
 807         Edit *new_edit = split_edit(position);
 808
 809         for(Edit *current = first; current; current = NEXT) {
 810                 if(current->startproject >= position) {
 811                         current->shift(difference);
 812                 }
 813         }
 814         return new_edit;
 815 }
 816
 817
 818 void Edits::shift_keyframes_recursive(int64_t position, int64_t length)
 819 {
 820         track->shift_keyframes(position, length);
 821 }
 822
 823 void Edits::shift_effects_recursive(int64_t position, int64_t length, int edit_autos)
 824 {
 825         track->shift_effects(position, length, edit_autos, 0);
 826 }
 827