cinelerra-5.1/cinelerra/indexfile.C

   1
   2 /*
   3  * CINELERRA
   4  * Copyright (C) 1997-2014 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 "arender.h"
  23 #include "asset.h"
  24 #include "automation.h"
  25 #include "autos.h"
  26 #include "bcsignals.h"
  27 #include "bctimer.h"
  28 #include "cache.h"
  29 #include "clip.h"
  30 #include "condition.h"
  31 #include "edit.h"
  32 #include "edl.h"
  33 #include "edlsession.h"
  34 #include "errorbox.h"
  35 #include "file.h"
  36 #include "filesystem.h"
  37 #include "filexml.h"
  38 #include "floatauto.h"
  39 #include "floatautos.h"
  40 #include "indexable.h"
  41 #include "indexfile.h"
  42 #include "indexstate.h"
  43 #include "indexthread.h"
  44 #include "language.h"
  45 #include "localsession.h"
  46 #include "mainprogress.h"
  47 #include "mwindowgui.h"
  48 #include "mwindow.h"
  49 #include "preferences.h"
  50 #include "removefile.h"
  51 #include "renderengine.h"
  52 #include "resourcepixmap.h"
  53 #include "samples.h"
  54 #include "theme.h"
  55 #include "timelinepane.h"
  56 #include "trackcanvas.h"
  57 #include "tracks.h"
  58 #include "transportque.h"
  59 #include "vframe.h"
  60
  61
  62 #include <stdio.h>
  63 #include <stdlib.h>
  64 #include <stdint.h>
  65 #include <unistd.h>
  66 #include <string.h>
  67 #include <errno.h>
  68 #include <fcntl.h>
  69 #include <ctype.h>
  70
  71 #include <sys/types.h>
  72 #include <sys/stat.h>
  73 #include <linux/iso_fs.h>
  74
  75 // check for isofs volume_id for dvd/cdrom
  76
  77 static int udf_volume_id(const char *path, char *fname)
  78 {
  79         struct stat st;
  80         if( stat(path,&st) ) return 1;
  81         // search mounted devices
  82         FILE *fp = fopen("/proc/mounts","r");
  83         if( !fp ) return 1;
  84
  85         int result = 1;
  86         while( result && !feof(fp) && !ferror(fp) ) {
  87                 char devpath[BCTEXTLEN], mpath[BCTEXTLEN];
  88                 char options[BCTEXTLEN], line[BCTEXTLEN];
  89                 char fstype[64], zero1[16], zero2[16];
  90                 if( !fgets(&line[0], sizeof(line)-1, fp) ) break;
  91                 int n = sscanf(&line[0], "%s %s %s %s %s %s\n",
  92                          devpath, mpath, fstype, options, zero1, zero2);
  93                 if( n != 6 ) continue;
  94                 // check udf filesystems
  95                 if( strcmp(fstype,"udf") != 0 ) continue;
  96                 struct stat dst;
  97                 if( stat(devpath,&dst) ) continue;
  98                 if( st.st_dev != dst.st_rdev ) continue;
  99                 int fd = open(devpath,O_RDONLY);
 100                 if( fd < 0 ) continue;
 101                 struct iso_primary_descriptor id;
 102                 if( lseek(fd,0x8000,SEEK_SET) == 0x8000 )
 103                         n = read(fd,&id,sizeof(id));
 104                 close(fd);
 105                 if( n != sizeof(id) ) continue;
 106                 // look for magic number
 107                 if( strncmp(ISO_STANDARD_ID,id.id,sizeof(id.id)) ) continue;
 108                 // look for volume_id
 109                 if( !isalnum(id.volume_id[0]) ) continue;
 110                 char *bp = (char*)&id.volume_id[0], *cp = fname;
 111                 for( int i=0; i<(int)sizeof(id.volume_id); ++i ) *cp++ = *bp++;
 112                 while( --cp>=fname && *cp==' ' ) *cp = 0;
 113                 if( !*fname ) continue;
 114                 // fname = volume_id _ creation_date
 115                 ++cp;  *cp++ = '_';  bp = (char*)&id.creation_date[0];
 116                 for( int i=0; i<(int)sizeof(id.creation_date)-1; ++i ) {
 117                         if( !isdigit(*bp) ) break;
 118                         *cp++ = *bp++;
 119                 }
 120                 *cp++ = 0;
 121                 if( cp-fname > 4 ) result = 0;
 122         }
 123
 124         fclose(fp);
 125         return result;
 126 }
 127
 128 // Use native sampling rates for files so the same index can be used in
 129 // multiple projects.
 130
 131 IndexFile::IndexFile(MWindow *mwindow)
 132 {
 133 //printf("IndexFile::IndexFile 1\n");
 134         reset();
 135         this->mwindow = mwindow;
 136 //printf("IndexFile::IndexFile 2\n");
 137         redraw_timer = new Timer;
 138 }
 139
 140 IndexFile::IndexFile(MWindow *mwindow,
 141         Indexable *indexable)
 142 {
 143 //printf("IndexFile::IndexFile 2\n");
 144         reset();
 145         this->mwindow = mwindow;
 146         this->indexable = indexable;
 147         redraw_timer = new Timer;
 148         if(indexable)
 149         {
 150                 indexable->add_user();
 151                 source_channels = indexable->get_audio_channels();
 152                 source_samplerate = indexable->get_sample_rate();
 153                 source_length = indexable->get_audio_samples();
 154         }
 155 }
 156
 157 IndexFile::~IndexFile()
 158 {
 159 //printf("IndexFile::~IndexFile 1\n");
 160         delete redraw_timer;
 161         if(indexable) indexable->remove_user();
 162         close_source();
 163 }
 164
 165 void IndexFile::reset()
 166 {
 167         fd = 0;
 168         source = 0;
 169         interrupt_flag = 0;
 170         source_length = 0;
 171         source_channels = 0;
 172         indexable = 0;
 173         render_engine = 0;
 174         cache = 0;
 175 }
 176
 177 IndexState* IndexFile::get_state()
 178 {
 179         IndexState *index_state = 0;
 180         if(indexable) index_state = indexable->index_state;
 181         return index_state;
 182 }
 183
 184
 185
 186 int IndexFile::open_index()
 187 {
 188         IndexState *index_state = 0;
 189         int result = 0;
 190
 191 // use buffer if being built
 192         index_state = get_state();
 193
 194         if(index_state->index_status == INDEX_BUILDING)
 195         {
 196 // use buffer
 197                 result = 0;
 198         }
 199         else
 200         if(!(result = open_file()))
 201         {
 202 // opened existing file
 203                 if(read_info())
 204                 {
 205                         result = 1;
 206                         close_index();
 207                 }
 208                 else
 209                 {
 210                         index_state->index_status = INDEX_READY;
 211                 }
 212         }
 213         else
 214         {
 215                 result = 1;
 216         }
 217
 218         return result;
 219 }
 220
 221 void IndexFile::delete_index(Preferences *preferences,
 222         Indexable *indexable, const char *suffix)
 223 {
 224         char index_filename[BCTEXTLEN];
 225         char source_filename[BCTEXTLEN];
 226         const char *path = indexable->path;
 227
 228         get_index_filename(source_filename,
 229                 preferences->index_directory,
 230                 index_filename, path, suffix);
 231 //printf("IndexFile::delete_index %s %s\n", source_filename, index_filename);
 232         remove_file(index_filename);
 233 }
 234
 235 int IndexFile::open_file()
 236 {
 237         int result = 0;
 238         const int debug = 0;
 239         const char *path = indexable->path;
 240
 241
 242 //printf("IndexFile::open_file %f\n", indexable->get_frame_rate());
 243
 244         get_index_filename(source_filename,
 245                 mwindow->preferences->index_directory,
 246                 index_filename,
 247                 path);
 248
 249         if(debug) printf("IndexFile::open_file %d index_filename=%s\n",
 250                 __LINE__,
 251                 index_filename);
 252         fd = fopen(index_filename, "rb");
 253         if( fd != 0 )
 254         {
 255 // Index file already exists.
 256 // Get its last size without changing the real asset status.
 257                 Indexable *test_indexable = new Indexable(0);
 258                 if(indexable)
 259                         test_indexable->copy_indexable(indexable);
 260                 read_info(test_indexable);
 261                 IndexState *index_state = test_indexable->index_state;
 262
 263                 FileSystem fs;
 264                 if(fs.get_date(index_filename) < fs.get_date(test_indexable->path))
 265                 {
 266                         if(debug) printf("IndexFile::open_file %d index_date=%jd source_date=%jd\n",
 267                                 __LINE__,
 268                                 fs.get_date(index_filename),
 269                                 fs.get_date(test_indexable->path));
 270
 271 // index older than source
 272                         result = 2;
 273                         fclose(fd);
 274                         fd = 0;
 275                 }
 276                 else
 277                 if(fs.get_size(test_indexable->path) != index_state->index_bytes)
 278                 {
 279 // source file is a different size than index source file
 280                         if(debug) printf("IndexFile::open_file %d index_size=%jd source_size=%jd\n",
 281                                 __LINE__,
 282                                 index_state->index_bytes,
 283                                 fs.get_size(test_indexable->path));
 284                         result = 2;
 285                         fclose(fd);
 286                         fd = 0;
 287                 }
 288                 else
 289                 {
 290                         if(debug) printf("IndexFile::open_file %d\n",
 291                                 __LINE__);
 292                         fseek(fd, 0, SEEK_END);
 293                         file_length = ftell(fd);
 294                         fseek(fd, 0, SEEK_SET);
 295                         result = 0;
 296                 }
 297                 test_indexable->Garbage::remove_user();
 298         }
 299         else
 300         {
 301 // doesn't exist
 302                 if(debug) printf("IndexFile::open_file %d index_filename=%s doesn't exist\n",
 303                         __LINE__,
 304                         index_filename);
 305                 result = 1;
 306         }
 307
 308         return result;
 309 }
 310
 311 int IndexFile::open_source()
 312 {
 313 //printf("IndexFile::open_source %p %s\n", asset, asset->path);
 314         int result = 0;
 315         if(indexable && indexable->is_asset)
 316         {
 317                 if(!source) source = new File;
 318
 319                 Asset *asset = (Asset*)indexable;
 320                 if(source->open_file(mwindow->preferences,
 321                         asset, 1, 0))
 322                 {
 323                         //printf("IndexFile::open_source() Couldn't open %s.\n", asset->path);
 324                         result = 1;
 325                 }
 326                 else
 327                 {
 328                         FileSystem fs;
 329                         asset->index_state->index_bytes = fs.get_size(asset->path);
 330                         source_length = source->get_audio_length();
 331                 }
 332         }
 333         else
 334         {
 335                 TransportCommand command;
 336                 command.command = NORMAL_FWD;
 337                 command.get_edl()->copy_all((EDL*)indexable);
 338                 command.change_type = CHANGE_ALL;
 339                 command.realtime = 0;
 340                 cache = new CICache(mwindow->preferences);
 341                 render_engine = new RenderEngine(0,
 342                         mwindow->preferences, 0, 0);
 343                 render_engine->set_acache(cache);
 344                 render_engine->arm_command(&command);
 345                 FileSystem fs;
 346                 indexable->index_state->index_bytes = fs.get_size(indexable->path);
 347         }
 348
 349         return result;
 350 }
 351
 352 void IndexFile::close_source()
 353 {
 354         delete source;
 355         source = 0;
 356
 357         delete render_engine;
 358         render_engine = 0;
 359
 360         delete cache;
 361         cache = 0;
 362 }
 363
 364 int64_t IndexFile::get_required_scale()
 365 {
 366         int64_t result = 1;
 367
 368
 369 // get scale of index file
 370 // Total peaks which may be stored in buffer
 371         int64_t peak_count = mwindow->preferences->index_size /
 372                 (2 * sizeof(float) * source_channels);
 373         for(result = 1;
 374                 source_length / result > peak_count;
 375                 result *= 2)
 376                 ;
 377
 378 // Takes too long to draw from source on a CDROM.  Make indexes for
 379 // everything.
 380
 381         return result;
 382 }
 383
 384 int IndexFile::get_index_filename(char *source_filename,
 385         char *index_directory,
 386         char *index_filename,
 387         const char *input_filename,
 388         const char *suffix)
 389 {
 390         const char *input_fn = input_filename;
 391         char volume_id[BCTEXTLEN];
 392 // Replace mount/directory with volume_id if isofs
 393         if( !udf_volume_id(input_filename, volume_id) )
 394         {
 395                 char *cp = strrchr((char*)input_filename,'/');
 396                 if( cp ) input_fn = cp + 1;
 397                 for( cp=volume_id; *cp; ++cp );
 398                 *cp++ = '_';  strcpy(cp, input_fn);
 399                 input_fn = volume_id;
 400         }
 401 // Replace slashes and dots
 402         int i, j;
 403         int len = strlen(input_fn);
 404         for(i = 0, j = 0; i < len; i++)
 405         {
 406                 if(input_fn[i] != '/' &&
 407                         input_fn[i] != '.')
 408                         source_filename[j++] = input_fn[i];
 409                 else
 410                 {
 411                         if(i > 0)
 412                                 source_filename[j++] = '_';
 413                 }
 414         }
 415         source_filename[j] = 0;
 416         FileSystem fs;
 417         fs.join_names(index_filename, index_directory, source_filename);
 418         strcat(index_filename, suffix ? suffix : ".idx");
 419         return 0;
 420 }
 421
 422 int IndexFile::interrupt_index()
 423 {
 424         interrupt_flag = 1;
 425         return 0;
 426 }
 427
 428 // Read data into buffers
 429
 430 int IndexFile::create_index(MainProgressBar *progress)
 431 {
 432         int result = 0;
 433 SET_TRACE
 434
 435         interrupt_flag = 0;
 436
 437 // open the source file
 438         if(open_source()) return 1;
 439         source_channels = indexable->get_audio_channels();
 440         source_samplerate = indexable->get_sample_rate();
 441         source_length = indexable->get_audio_samples();
 442
 443 SET_TRACE
 444
 445         get_index_filename(source_filename,
 446                 mwindow->preferences->index_directory,
 447                 index_filename,
 448                 indexable->path);
 449
 450 SET_TRACE
 451
 452 // Some file formats have their own sample index.
 453 // Test for index in stream table of contents
 454         if(source && !source->get_index(this, progress))
 455         {
 456                 IndexState *index_state = get_state();
 457                 index_state->index_status = INDEX_READY;
 458                 redraw_edits(1);
 459         }
 460         else
 461 // Build index from scratch
 462         {
 463 SET_TRACE
 464
 465 // Indexes are now built for everything since it takes too long to draw
 466 // from CDROM source.
 467
 468 // get amount to read at a time in floats
 469                 int64_t buffersize = 65536;
 470                 char string[BCTEXTLEN];
 471                 sprintf(string, _("Creating %s."), index_filename);
 472
 473                 progress->update_title(string);
 474                 progress->update_length(source_length);
 475                 redraw_timer->update();
 476 SET_TRACE
 477
 478 // thread out index thread
 479                 IndexThread *index_thread = new IndexThread(mwindow,
 480                         this,
 481                         index_filename,
 482                         buffersize,
 483                         source_length);
 484                 index_thread->start_build();
 485
 486 // current sample in source file
 487                 int64_t position = 0;
 488                 int64_t fragment_size = buffersize;
 489                 int current_buffer = 0;
 490
 491
 492 // pass through file once
 493 // printf("IndexFile::create_index %d source_length=%jd source=%p progress=%p\n",
 494 // __LINE__,
 495 // source_length,
 496 // source,
 497 // progress);
 498 SET_TRACE
 499                 while(position < source_length && !result)
 500                 {
 501 SET_TRACE
 502                         if(source_length - position < fragment_size && fragment_size == buffersize) fragment_size = source_length - position;
 503
 504                         index_thread->input_lock[current_buffer]->lock("IndexFile::create_index 1");
 505                         index_thread->input_len[current_buffer] = fragment_size;
 506
 507 SET_TRACE
 508                         int cancelled = progress->update(position);
 509 //printf("IndexFile::create_index cancelled=%d\n", cancelled);
 510 SET_TRACE
 511                         if(cancelled ||
 512                                 index_thread->interrupt_flag ||
 513                                 interrupt_flag)
 514                         {
 515                                 result = 3;
 516                         }
 517
 518
 519 SET_TRACE
 520                         if(source && !result)
 521                         {
 522 SET_TRACE
 523                                 for(int channel = 0;
 524                                         !result && channel < source_channels;
 525                                         channel++)
 526                                 {
 527 // Read from source file
 528                                         source->set_audio_position(position);
 529                                         source->set_channel(channel);
 530
 531                                         if(source->read_samples(
 532                                                 index_thread->buffer_in[current_buffer][channel],
 533                                                 fragment_size))
 534                                                 result = 1;
 535                                 }
 536 SET_TRACE
 537                         }
 538                         else
 539                         if(render_engine && !result)
 540                         {
 541 SET_TRACE
 542                                 if(render_engine->arender)
 543                                 {
 544                                         result = render_engine->arender->process_buffer(
 545                                                 index_thread->buffer_in[current_buffer],
 546                                                 fragment_size,
 547                                                 position);
 548                                 }
 549                                 else
 550                                 {
 551                                         for(int i = 0; i < source_channels; i++)
 552                                         {
 553                                                 bzero(index_thread->buffer_in[current_buffer][i]->get_data(),
 554                                                         fragment_size * sizeof(double));
 555                                         }
 556                                 }
 557 SET_TRACE
 558                         }
 559 SET_TRACE
 560
 561 // Release buffer to thread
 562                         if(!result)
 563                         {
 564                                 index_thread->output_lock[current_buffer]->unlock();
 565                                 current_buffer++;
 566                                 if(current_buffer >= TOTAL_INDEX_BUFFERS) current_buffer = 0;
 567                                 position += fragment_size;
 568                         }
 569                         else
 570                         {
 571                                 index_thread->input_lock[current_buffer]->unlock();
 572                         }
 573 SET_TRACE
 574                 }
 575
 576
 577 // end thread cleanly
 578                 index_thread->input_lock[current_buffer]->lock("IndexFile::create_index 2");
 579                 index_thread->last_buffer[current_buffer] = 1;
 580                 index_thread->output_lock[current_buffer]->unlock();
 581                 index_thread->stop_build();
 582
 583
 584                 delete index_thread;
 585
 586         }
 587
 588
 589
 590         close_source();
 591
 592
 593
 594         open_index();
 595
 596         close_index();
 597
 598         mwindow->edl->set_index_file(indexable);
 599         return 0;
 600 }
 601
 602
 603
 604 int IndexFile::redraw_edits(int force)
 605 {
 606         int64_t difference = redraw_timer->get_scaled_difference(1000);
 607
 608         if(difference > 250 || force)
 609         {
 610                 redraw_timer->update();
 611                 mwindow->gui->lock_window("IndexFile::redraw_edits");
 612                 mwindow->edl->set_index_file(indexable);
 613                 mwindow->gui->draw_indexes(indexable);
 614                 mwindow->gui->unlock_window();
 615         }
 616         return 0;
 617 }
 618
 619
 620
 621
 622 int IndexFile::draw_index(
 623         TrackCanvas *canvas,
 624         ResourcePixmap *pixmap,
 625         Edit *edit,
 626         int x,
 627         int w)
 628 {
 629         const int debug = 0;
 630         IndexState *index_state = get_state();
 631         int pane_number = canvas->pane->number;
 632 //index_state->dump();
 633
 634 SET_TRACE
 635         if(debug) printf("IndexFile::draw_index %d\n", __LINE__);
 636         if(index_state->index_zoom == 0)
 637         {
 638                 printf(_("IndexFile::draw_index: index has 0 zoom\n"));
 639                 return 0;
 640         }
 641         if(debug) printf("IndexFile::draw_index %d\n", __LINE__);
 642
 643 // test channel number
 644         if(edit->channel > source_channels) return 1;
 645         if(debug) printf("IndexFile::draw_index %d source_samplerate=%d "
 646                         "w=%d samplerate=%jd zoom_sample=%jd\n",
 647                 __LINE__, source_samplerate, w,
 648                 mwindow->edl->session->sample_rate,
 649                 mwindow->edl->local_session->zoom_sample);
 650
 651 // calculate a virtual x where the edit_x should be in floating point
 652         double virtual_edit_x = 1.0 *
 653                 edit->track->from_units(edit->startproject) *
 654                 mwindow->edl->session->sample_rate /
 655                 mwindow->edl->local_session->zoom_sample -
 656                 mwindow->edl->local_session->view_start[pane_number];
 657
 658 // samples in segment to draw relative to asset
 659         FloatAutos *speed_autos = !edit->track->has_speed() ? 0 :
 660                 (FloatAutos *)edit->track->automation->autos[AUTOMATION_SPEED];
 661         double project_zoom = mwindow->edl->local_session->zoom_sample;
 662         int64_t edit_position = (x + pixmap->pixmap_x - virtual_edit_x) * project_zoom;
 663         int64_t start_position = edit->startsource;
 664         start_position += !speed_autos ? edit_position :
 665                 speed_autos->automation_integral(edit->startproject, edit_position, PLAY_FORWARD);
 666         int64_t end_position = edit->startsource;
 667         edit_position = (x + w + pixmap->pixmap_x - virtual_edit_x) * project_zoom;
 668         end_position += !speed_autos ? edit_position :
 669                 speed_autos->automation_integral(edit->startproject, edit_position, PLAY_FORWARD);
 670         double session_sample_rate = mwindow->edl->session->sample_rate;
 671         double asset_over_session = (double)indexable->get_sample_rate() / session_sample_rate;
 672         int64_t start_source = start_position * asset_over_session;
 673         if( start_source < 0 ) start_source = 0;
 674         int64_t start_index = start_source / index_state->index_zoom;
 675         int64_t end_source = end_position * asset_over_session;
 676         if( end_source < 0 ) end_source = 0;
 677         int64_t end_index = end_source / index_state->index_zoom;
 678 // start/length of index to read in floats
 679         start_index *= 2;  end_index *= 2;
 680 // length of index available in floats
 681         int64_t size_index = index_state->index_status == INDEX_BUILDING ?
 682                 index_state->get_channel_used(edit->channel) * 2 :
 683                 index_state->get_index_size(edit->channel);
 684 // Clamp length of index to read by available data
 685         if( end_index >= size_index ) end_index = size_index;
 686         int64_t length_index = end_index - start_index;
 687         if( length_index <= 0 ) return 0;
 688
 689 // Start and length of fragment to read from file in bytes.
 690         float *buffer = 0;
 691         int buffer_shared = 0;
 692         int center_pixel = mwindow->edl->local_session->zoom_track / 2;
 693         if( edit->track->show_titles() )
 694                 center_pixel += mwindow->theme->get_image("title_bg_data")->get_h();
 695
 696         if( index_state->index_status == INDEX_BUILDING ) {
 697 // index is in RAM, being built
 698                 buffer = index_state->get_channel_buffer(edit->channel);
 699                 if( !buffer ) return 0;
 700                 buffer += start_index;
 701                 buffer_shared = 1;
 702         }
 703         else {
 704                 buffer = new float[length_index + 1];
 705                 int64_t length_buffer = length_index * sizeof(float);
 706 // add file/channel offset
 707                 int64_t index_offset = index_state->get_index_offset(edit->channel);
 708                 int64_t file_offset = (index_offset + start_index) * sizeof(float);
 709                 int64_t file_pos = index_state->index_start + file_offset;
 710                 int64_t read_length = file_length - file_pos;
 711                 if( read_length > length_buffer )
 712                         read_length = length_buffer;
 713                 int64_t length_read = 0;
 714                 if( read_length > 0 ) {
 715                         fseek(fd, file_pos, SEEK_SET);
 716                         length_read = fread(buffer, 1, read_length + sizeof(float), fd);
 717                         length_read &= ~(sizeof(float)-1);
 718                 }
 719                 if( (read_length-=length_read) > 0 )
 720                         memset((char*)buffer + length_read, 0, read_length);
 721                 buffer_shared = 0;
 722         }
 723
 724         canvas->set_color(mwindow->theme->audio_color);
 725
 726         int prev_y1 = center_pixel;
 727         int prev_y2 = center_pixel;
 728         int first_frame = 1;
 729         int zoom_y = mwindow->edl->local_session->zoom_y, zoom_y2 = zoom_y / 2;
 730         int max_y = center_pixel + zoom_y2 - 1;
 731         edit_position = (x + pixmap->pixmap_x - virtual_edit_x) * project_zoom;
 732         int64_t speed_position = edit->startsource;
 733         speed_position += !speed_autos ? edit_position :
 734                 speed_autos->automation_integral(edit->startproject, edit_position, PLAY_FORWARD);
 735         int64_t source_position  = speed_position * asset_over_session;
 736         int64_t index_position = source_position / index_state->index_zoom;
 737         int64_t i = 2 * index_position - start_index;
 738         CLAMP(i, 0, length_index);
 739 SET_TRACE
 740
 741         for( int64_t x1=0; x1<w && i < length_index; ++x1 ) {
 742                 float highsample = buffer[i];  ++i;
 743                 float lowsample = buffer[i];   ++i;
 744                 int x2 = x1 + x + 1;
 745                 edit_position = (x2 + pixmap->pixmap_x - virtual_edit_x) * project_zoom;
 746                 int64_t speed_position = edit->startsource;
 747                 speed_position += !speed_autos ? edit_position :
 748                         speed_autos->automation_integral(edit->startproject, edit_position, PLAY_FORWARD);
 749                 source_position  = speed_position * asset_over_session;
 750                 index_position = source_position / index_state->index_zoom;
 751                 int64_t k = 2 * index_position - start_index;
 752                 CLAMP(k, 0, length_index);
 753                 while( i < k ) {
 754                         highsample = MAX(highsample, buffer[i]); ++i;
 755                         lowsample = MIN(lowsample, buffer[i]);   ++i;
 756                 }
 757
 758                 int y1 = (int)(center_pixel - highsample * zoom_y2);
 759                 int y2 = (int)(center_pixel - lowsample * zoom_y2);
 760                 CLAMP(y1, 0, max_y);  int next_y1 = y1;
 761                 CLAMP(y2, 0, max_y);  int next_y2 = y2;
 762 //printf("draw_line (%f,%f) = %d,%d,  %d,%d\n", lowsample, highsample, x2, y1, x2, y2);
 763
 764 //SET_TRACE
 765 // A different algorithm has to be used if it's 1 sample per pixel and the
 766 // index is used.  Now the min and max values are equal so we join the max samples.
 767                 if(mwindow->edl->local_session->zoom_sample == 1) {
 768                         canvas->draw_line(x2 - 1, prev_y1, x2, y1, pixmap);
 769                 }
 770                 else {
 771 // Extend line height if it doesn't connect to previous line
 772                         if(!first_frame) {
 773                                 if(y1 > prev_y2) y1 = prev_y2 + 1;
 774                                 if(y2 < prev_y1) y2 = prev_y1 - 1;
 775                         }
 776                         else {
 777                                 first_frame = 0;
 778                         }
 779                         canvas->draw_line(x2, y1, x2, y2, pixmap);
 780                 }
 781                 prev_y1 = next_y1;
 782                 prev_y2 = next_y2;
 783         }
 784
 785 SET_TRACE
 786
 787         if(!buffer_shared) delete [] buffer;
 788 SET_TRACE
 789         if(debug) printf("IndexFile::draw_index %d\n", __LINE__);
 790         return 0;
 791 }
 792
 793 int IndexFile::close_index()
 794 {
 795         if(fd)
 796         {
 797                 fclose(fd);
 798                 fd = 0;
 799         }
 800         return 0;
 801 }
 802
 803 int IndexFile::remove_index()
 804 {
 805         IndexState *index_state = get_state();
 806         if(index_state->index_status == INDEX_READY ||
 807                 index_state->index_status == INDEX_NOTTESTED)
 808         {
 809                 close_index();
 810                 remove(index_filename);
 811         }
 812         return 0;
 813 }
 814
 815 int IndexFile::read_info(Indexable *test_indexable)
 816 {
 817         const int debug = 0;
 818
 819 // Store format in actual asset.
 820 // If it's a nested EDL, we never want the format, just the index info.
 821         if(!test_indexable) test_indexable = indexable;
 822         if(!test_indexable) return 1;
 823
 824         IndexState * index_state = test_indexable->index_state;
 825         if(index_state->index_status == INDEX_NOTTESTED)
 826         {
 827 // read start of index data
 828                 int temp = fread((char*)&(index_state->index_start), sizeof(int64_t), 1, fd);
 829 //printf("IndexFile::read_info %d %f\n", __LINE__, test_indexable->get_frame_rate());
 830
 831                 if(!temp) return 1;
 832 // read test_indexable info from index
 833                 char *data;
 834
 835                 data = new char[index_state->index_start];
 836                 temp = fread(data, index_state->index_start - sizeof(int64_t), 1, fd);
 837                 if(!temp) return 1;
 838
 839                 data[index_state->index_start - sizeof(int64_t)] = 0;
 840                 FileXML xml;
 841                 xml.read_from_string(data);
 842                 delete [] data;
 843
 844
 845
 846 // Read the file format & index state.
 847                 if(test_indexable->is_asset)
 848                 {
 849                         Asset *test_asset = (Asset *)test_indexable;
 850                         Asset *asset = new Asset;
 851                         asset->read(&xml);
 852                         int ret = 0;
 853 //printf("IndexFile::read_info %d %f\n", __LINE__, asset->get_frame_rate());
 854
 855                         if( asset->format == FILE_UNKNOWN ||
 856                             test_asset->format != asset->format ) {
 857 if(debug) printf("IndexFile::read_info %d\n", __LINE__);
 858                                 ret = 1;
 859                         }
 860                         asset->remove_user();
 861                         if( ret ) return ret;
 862                 }
 863                 else
 864                 {
 865 // Read only the index state for a nested EDL
 866                         int result = 0;
 867 if(debug) printf("IndexFile::read_info %d\n", __LINE__);
 868                         while(!result)
 869                         {
 870                                 result = xml.read_tag();
 871                                 if(!result)
 872                                 {
 873                                         if(xml.tag.title_is("INDEX"))
 874                                         {
 875                                                 index_state->read_xml(&xml, source_channels);
 876 if(debug) printf("IndexFile::read_info %d\n", __LINE__);
 877 if(debug) index_state->dump();
 878                                                 result = 1;
 879                                         }
 880                                 }
 881                         }
 882                 }
 883         }
 884
 885         return 0;
 886 }
 887
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