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 #ifdef HAVE_ISOFS
  74 #include <linux/iso_fs.h>
  75 #endif
  76
  77 // check for isofs volume_id for dvd/cdrom
  78
  79 static int udf_volume_id(const char *path, char *fname)
  80 {
  81         int result = 1;
  82 #ifdef HAVE_ISOFS
  83         struct stat st;
  84         if( stat(path,&st) ) return 1;
  85         // search mounted devices
  86         FILE *fp = fopen("/proc/mounts","r");
  87         if( !fp ) return 1;
  88
  89         while( result && !feof(fp) && !ferror(fp) ) {
  90                 char devpath[BCTEXTLEN], mpath[BCTEXTLEN];
  91                 char options[BCTEXTLEN], line[BCTEXTLEN];
  92                 char fstype[64], zero1[16], zero2[16];
  93                 if( !fgets(&line[0], sizeof(line)-1, fp) ) break;
  94                 int n = sscanf(&line[0], "%s %s %s %s %s %s\n",
  95                          devpath, mpath, fstype, options, zero1, zero2);
  96                 if( n != 6 ) continue;
  97                 // check udf filesystems
  98                 if( strcmp(fstype,"udf") != 0 ) continue;
  99                 struct stat dst;
 100                 if( stat(devpath,&dst) ) continue;
 101                 if( st.st_dev != dst.st_rdev ) continue;
 102                 int fd = open(devpath,O_RDONLY);
 103                 if( fd < 0 ) continue;
 104                 struct iso_primary_descriptor id;
 105                 if( lseek(fd,0x8000,SEEK_SET) == 0x8000 )
 106                         n = read(fd,&id,sizeof(id));
 107                 close(fd);
 108                 if( n != sizeof(id) ) continue;
 109                 // look for magic number
 110                 if( strncmp(ISO_STANDARD_ID,id.id,sizeof(id.id)) ) continue;
 111                 // look for volume_id
 112                 if( !isalnum(id.volume_id[0]) ) continue;
 113                 char *bp = (char*)&id.volume_id[0], *cp = fname;
 114                 for( int i=0; i<(int)sizeof(id.volume_id); ++i ) *cp++ = *bp++;
 115                 while( --cp>=fname && *cp==' ' ) *cp = 0;
 116                 if( !*fname ) continue;
 117                 // fname = volume_id _ creation_date
 118                 ++cp;  *cp++ = '_';  bp = (char*)&id.creation_date[0];
 119                 for( int i=0; i<(int)sizeof(id.creation_date)-1; ++i ) {
 120                         if( !isdigit(*bp) ) break;
 121                         *cp++ = *bp++;
 122                 }
 123                 *cp++ = 0;
 124                 if( cp-fname > 4 ) result = 0;
 125         }
 126
 127         fclose(fp);
 128 #endif
 129         return result;
 130 }
 131
 132 // Use native sampling rates for files so the same index can be used in
 133 // multiple projects.
 134
 135 IndexFile::IndexFile(MWindow *mwindow)
 136 {
 137 //printf("IndexFile::IndexFile 1\n");
 138         reset();
 139         this->mwindow = mwindow;
 140 //printf("IndexFile::IndexFile 2\n");
 141         redraw_timer = new Timer;
 142 }
 143
 144 IndexFile::IndexFile(MWindow *mwindow,
 145         Indexable *indexable)
 146 {
 147 //printf("IndexFile::IndexFile 2\n");
 148         reset();
 149         this->mwindow = mwindow;
 150         this->indexable = indexable;
 151         redraw_timer = new Timer;
 152         if(indexable)
 153         {
 154                 indexable->add_user();
 155                 source_channels = indexable->get_audio_channels();
 156                 source_samplerate = indexable->get_sample_rate();
 157                 source_length = indexable->get_audio_samples();
 158         }
 159 }
 160
 161 IndexFile::~IndexFile()
 162 {
 163 //printf("IndexFile::~IndexFile 1\n");
 164         delete redraw_timer;
 165         if(indexable) indexable->remove_user();
 166         close_source();
 167 }
 168
 169 void IndexFile::reset()
 170 {
 171         fd = 0;
 172         source = 0;
 173         interrupt_flag = 0;
 174         source_length = 0;
 175         source_channels = 0;
 176         indexable = 0;
 177         render_engine = 0;
 178         cache = 0;
 179 }
 180
 181 IndexState* IndexFile::get_state()
 182 {
 183         IndexState *index_state = 0;
 184         if(indexable) index_state = indexable->index_state;
 185         return index_state;
 186 }
 187
 188
 189
 190 int IndexFile::open_index()
 191 {
 192         IndexState *index_state = 0;
 193         int result = 0;
 194
 195 // use buffer if being built
 196         index_state = get_state();
 197
 198         if(index_state->index_status == INDEX_BUILDING)
 199         {
 200 // use buffer
 201                 result = 0;
 202         }
 203         else
 204         if(!(result = open_file()))
 205         {
 206 // opened existing file
 207                 if(read_info())
 208                 {
 209                         result = 1;
 210                         close_index();
 211                 }
 212                 else
 213                 {
 214                         index_state->index_status = INDEX_READY;
 215                 }
 216         }
 217         else
 218         {
 219                 result = 1;
 220         }
 221
 222         return result;
 223 }
 224
 225 void IndexFile::delete_index(Preferences *preferences,
 226         Indexable *indexable, const char *suffix)
 227 {
 228         char index_filename[BCTEXTLEN];
 229         char source_filename[BCTEXTLEN];
 230         const char *path = indexable->path;
 231         if( !*path ) return;
 232         get_index_filename(source_filename,
 233                 preferences->index_directory,
 234                 index_filename, path, suffix);
 235 //printf("IndexFile::delete_index %s %s\n", source_filename, index_filename);
 236         remove_file(index_filename);
 237 }
 238
 239 void IndexFile::delete_index_files(Preferences *preferences,
 240         Indexable *indexable)
 241 {
 242         delete_index(preferences, indexable, ".toc");
 243         delete_index(preferences, indexable, ".idx");
 244         delete_index(preferences, indexable, ".mkr");
 245 }
 246
 247
 248 int IndexFile::open_file()
 249 {
 250         int result = 0;
 251         const int debug = 0;
 252         const char *path = indexable->path;
 253
 254
 255 //printf("IndexFile::open_file %f\n", indexable->get_frame_rate());
 256
 257         get_index_filename(source_filename,
 258                 mwindow->preferences->index_directory,
 259                 index_filename,
 260                 path);
 261
 262         if(debug) printf("IndexFile::open_file %d index_filename=%s\n",
 263                 __LINE__,
 264                 index_filename);
 265         fd = fopen(index_filename, "rb");
 266         if( fd != 0 )
 267         {
 268 // Index file already exists.
 269 // Get its last size without changing the real asset status.
 270                 Indexable *test_indexable = new Indexable(0);
 271                 if(indexable)
 272                         test_indexable->copy_indexable(indexable);
 273                 read_info(test_indexable);
 274                 IndexState *index_state = test_indexable->index_state;
 275
 276                 FileSystem fs;
 277                 if(fs.get_date(index_filename) < fs.get_date(test_indexable->path))
 278                 {
 279                         if(debug) printf("IndexFile::open_file %d index_date=%jd source_date=%jd\n",
 280                                 __LINE__,
 281                                 fs.get_date(index_filename),
 282                                 fs.get_date(test_indexable->path));
 283
 284 // index older than source
 285                         result = 2;
 286                         fclose(fd);
 287                         fd = 0;
 288                 }
 289                 else
 290                 if(fs.get_size(test_indexable->path) != index_state->index_bytes)
 291                 {
 292 // source file is a different size than index source file
 293                         if(debug) printf("IndexFile::open_file %d index_size=%jd source_size=%jd\n",
 294                                 __LINE__,
 295                                 index_state->index_bytes,
 296                                 fs.get_size(test_indexable->path));
 297                         result = 2;
 298                         fclose(fd);
 299                         fd = 0;
 300                 }
 301                 else
 302                 {
 303                         if(debug) printf("IndexFile::open_file %d\n",
 304                                 __LINE__);
 305                         fseek(fd, 0, SEEK_END);
 306                         file_length = ftell(fd);
 307                         fseek(fd, 0, SEEK_SET);
 308                         result = 0;
 309                 }
 310                 test_indexable->Garbage::remove_user();
 311         }
 312         else
 313         {
 314 // doesn't exist
 315                 if(debug) printf("IndexFile::open_file %d index_filename=%s doesn't exist\n",
 316                         __LINE__,
 317                         index_filename);
 318                 result = 1;
 319         }
 320
 321         return result;
 322 }
 323
 324 int IndexFile::open_source()
 325 {
 326 //printf("IndexFile::open_source %p %s\n", asset, asset->path);
 327         int result = 0;
 328         if(indexable && indexable->is_asset)
 329         {
 330                 if(!source) source = new File;
 331
 332                 Asset *asset = (Asset*)indexable;
 333                 if(source->open_file(mwindow->preferences,
 334                         asset, 1, 0))
 335                 {
 336                         //printf("IndexFile::open_source() Couldn't open %s.\n", asset->path);
 337                         result = 1;
 338                 }
 339                 else
 340                 {
 341                         FileSystem fs;
 342                         asset->index_state->index_bytes = fs.get_size(asset->path);
 343                         source_length = source->get_audio_length();
 344                         int proxy_scale = asset->proxy_scale;
 345                         if( proxy_scale > 0 ) {
 346                                 asset->width = asset->actual_width * proxy_scale;
 347                                 asset->height = asset->actual_height * proxy_scale;
 348                         }
 349                 }
 350         }
 351         else
 352         {
 353                 TransportCommand command;
 354                 command.command = NORMAL_FWD;
 355                 command.get_edl()->copy_all((EDL*)indexable);
 356                 command.change_type = CHANGE_ALL;
 357                 command.realtime = 0;
 358                 cache = new CICache(mwindow->preferences);
 359                 render_engine = new RenderEngine(0,
 360                         mwindow->preferences, 0, 0);
 361                 render_engine->set_acache(cache);
 362                 render_engine->arm_command(&command);
 363                 FileSystem fs;
 364                 indexable->index_state->index_bytes = fs.get_size(indexable->path);
 365         }
 366
 367         return result;
 368 }
 369
 370 void IndexFile::close_source()
 371 {
 372         delete source;
 373         source = 0;
 374
 375         delete render_engine;
 376         render_engine = 0;
 377         if( cache ) {
 378                 cache->remove_user();
 379                 cache = 0;
 380         }
 381 }
 382
 383 int64_t IndexFile::get_required_scale()
 384 {
 385         int64_t result = 1;
 386
 387
 388 // get scale of index file
 389 // Total peaks which may be stored in buffer
 390         int64_t peak_count = mwindow->preferences->index_size /
 391                 (2 * sizeof(float) * source_channels);
 392         for(result = 1;
 393                 source_length / result > peak_count;
 394                 result *= 2)
 395                 ;
 396
 397 // Takes too long to draw from source on a CDROM.  Make indexes for
 398 // everything.
 399
 400         return result;
 401 }
 402
 403 int IndexFile::get_index_filename(char *source_filename,
 404         char *index_directory,
 405         char *index_filename,
 406         const char *input_filename,
 407         const char *suffix)
 408 {
 409         const char *input_fn = input_filename;
 410         char volume_id[BCTEXTLEN];
 411 // Replace mount/directory with volume_id if isofs
 412         if( !udf_volume_id(input_filename, volume_id) )
 413         {
 414                 char *cp = strrchr((char*)input_filename,'/');
 415                 if( cp ) input_fn = cp + 1;
 416                 for( cp=volume_id; *cp; ++cp );
 417                 *cp++ = '_';  strcpy(cp, input_fn);
 418                 input_fn = volume_id;
 419         }
 420 // Replace slashes and dots
 421         int i, j;
 422         int len = strlen(input_fn);
 423         for(i = 0, j = 0; i < len; i++)
 424         {
 425                 if(input_fn[i] != '/' &&
 426                         input_fn[i] != '.')
 427                         source_filename[j++] = input_fn[i];
 428                 else
 429                 {
 430                         if(i > 0)
 431                                 source_filename[j++] = '_';
 432                 }
 433         }
 434         source_filename[j] = 0;
 435         FileSystem fs;
 436         fs.join_names(index_filename, index_directory, source_filename);
 437         strcat(index_filename, suffix ? suffix : ".idx");
 438         return 0;
 439 }
 440
 441 int IndexFile::interrupt_index()
 442 {
 443         interrupt_flag = 1;
 444         return 0;
 445 }
 446
 447 // Read data into buffers
 448
 449 int IndexFile::create_index(MainProgressBar *progress)
 450 {
 451         int result = 0;
 452 SET_TRACE
 453
 454         interrupt_flag = 0;
 455
 456 // open the source file
 457         if(open_source()) return 1;
 458         source_channels = indexable->get_audio_channels();
 459         source_samplerate = indexable->get_sample_rate();
 460         source_length = indexable->get_audio_samples();
 461
 462 SET_TRACE
 463
 464         get_index_filename(source_filename,
 465                 mwindow->preferences->index_directory,
 466                 index_filename,
 467                 indexable->path);
 468
 469 SET_TRACE
 470
 471 // Some file formats have their own sample index.
 472 // Test for index in stream table of contents
 473         if(source && !source->get_index(this, progress))
 474         {
 475                 IndexState *index_state = get_state();
 476                 index_state->index_status = INDEX_READY;
 477                 redraw_edits(1);
 478         }
 479         else
 480 // Build index from scratch
 481         {
 482 SET_TRACE
 483
 484 // Indexes are now built for everything since it takes too long to draw
 485 // from CDROM source.
 486
 487 // get amount to read at a time in floats
 488                 int64_t buffersize = 65536;
 489                 char string[BCTEXTLEN];
 490                 sprintf(string, _("Creating %s."), index_filename);
 491
 492                 progress->update_title(string);
 493                 progress->update_length(source_length);
 494                 redraw_timer->update();
 495 SET_TRACE
 496
 497 // thread out index thread
 498                 IndexThread *index_thread = new IndexThread(mwindow,
 499                         this,
 500                         index_filename,
 501                         buffersize,
 502                         source_length);
 503                 index_thread->start_build();
 504
 505 // current sample in source file
 506                 int64_t position = 0;
 507                 int64_t fragment_size = buffersize;
 508                 int current_buffer = 0;
 509
 510
 511 // pass through file once
 512 // printf("IndexFile::create_index %d source_length=%jd source=%p progress=%p\n",
 513 // __LINE__,
 514 // source_length,
 515 // source,
 516 // progress);
 517 SET_TRACE
 518                 while(position < source_length && !result)
 519                 {
 520 SET_TRACE
 521                         if(source_length - position < fragment_size && fragment_size == buffersize) fragment_size = source_length - position;
 522
 523                         index_thread->input_lock[current_buffer]->lock("IndexFile::create_index 1");
 524                         index_thread->input_len[current_buffer] = fragment_size;
 525
 526 SET_TRACE
 527                         int cancelled = progress->update(position);
 528 //printf("IndexFile::create_index cancelled=%d\n", cancelled);
 529 SET_TRACE
 530                         if(cancelled ||
 531                                 index_thread->interrupt_flag ||
 532                                 interrupt_flag)
 533                         {
 534                                 result = 3;
 535                         }
 536
 537
 538 SET_TRACE
 539                         if(source && !result)
 540                         {
 541 SET_TRACE
 542                                 for(int channel = 0;
 543                                         !result && channel < source_channels;
 544                                         channel++)
 545                                 {
 546 // Read from source file
 547                                         source->set_audio_position(position);
 548                                         source->set_channel(channel);
 549
 550                                         if(source->read_samples(
 551                                                 index_thread->buffer_in[current_buffer][channel],
 552                                                 fragment_size))
 553                                                 result = 1;
 554                                 }
 555 SET_TRACE
 556                         }
 557                         else
 558                         if(render_engine && !result)
 559                         {
 560 SET_TRACE
 561                                 if(render_engine->arender)
 562                                 {
 563                                         result = render_engine->arender->process_buffer(
 564                                                 index_thread->buffer_in[current_buffer],
 565                                                 fragment_size,
 566                                                 position);
 567                                 }
 568                                 else
 569                                 {
 570                                         for(int i = 0; i < source_channels; i++)
 571                                         {
 572                                                 bzero(index_thread->buffer_in[current_buffer][i]->get_data(),
 573                                                         fragment_size * sizeof(double));
 574                                         }
 575                                 }
 576 SET_TRACE
 577                         }
 578 SET_TRACE
 579
 580 // Release buffer to thread
 581                         if(!result)
 582                         {
 583                                 index_thread->output_lock[current_buffer]->unlock();
 584                                 current_buffer++;
 585                                 if(current_buffer >= TOTAL_INDEX_BUFFERS) current_buffer = 0;
 586                                 position += fragment_size;
 587                         }
 588                         else
 589                         {
 590                                 index_thread->input_lock[current_buffer]->unlock();
 591                         }
 592 SET_TRACE
 593                 }
 594
 595
 596 // end thread cleanly
 597                 index_thread->input_lock[current_buffer]->lock("IndexFile::create_index 2");
 598                 index_thread->last_buffer[current_buffer] = 1;
 599                 index_thread->output_lock[current_buffer]->unlock();
 600                 index_thread->stop_build();
 601
 602
 603                 delete index_thread;
 604
 605         }
 606
 607
 608
 609         close_source();
 610
 611
 612
 613         open_index();
 614
 615         close_index();
 616
 617         mwindow->edl->set_index_file(indexable);
 618         return 0;
 619 }
 620
 621
 622
 623 int IndexFile::redraw_edits(int force)
 624 {
 625         int64_t difference = redraw_timer->get_scaled_difference(1000);
 626
 627         if(difference > 250 || force)
 628         {
 629                 redraw_timer->update();
 630                 mwindow->gui->lock_window("IndexFile::redraw_edits");
 631                 mwindow->edl->set_index_file(indexable);
 632                 mwindow->gui->draw_indexes(indexable);
 633                 mwindow->gui->unlock_window();
 634         }
 635         return 0;
 636 }
 637
 638
 639
 640
 641 int IndexFile::draw_index(
 642         TrackCanvas *canvas,
 643         ResourcePixmap *pixmap,
 644         Edit *edit,
 645         int x,
 646         int w)
 647 {
 648         const int debug = 0;
 649         IndexState *index_state = get_state();
 650         int pane_number = canvas->pane->number;
 651 //index_state->dump();
 652
 653 SET_TRACE
 654         if(debug) printf("IndexFile::draw_index %d\n", __LINE__);
 655         if(index_state->index_zoom == 0)
 656         {
 657                 printf(_("IndexFile::draw_index: index has 0 zoom\n"));
 658                 return 0;
 659         }
 660         if(debug) printf("IndexFile::draw_index %d\n", __LINE__);
 661
 662 // test channel number
 663         if(edit->channel > source_channels) return 1;
 664         if(debug) printf("IndexFile::draw_index %d source_samplerate=%d "
 665                         "w=%d samplerate=%jd zoom_sample=%jd\n",
 666                 __LINE__, source_samplerate, w,
 667                 mwindow->edl->session->sample_rate,
 668                 mwindow->edl->local_session->zoom_sample);
 669
 670 // calculate a virtual x where the edit_x should be in floating point
 671         double virtual_edit_x = 1.0 *
 672                 edit->track->from_units(edit->startproject) *
 673                 mwindow->edl->session->sample_rate /
 674                 mwindow->edl->local_session->zoom_sample -
 675                 mwindow->edl->local_session->view_start[pane_number];
 676
 677 // samples in segment to draw relative to asset
 678         FloatAutos *speed_autos = !edit->track->has_speed() ? 0 :
 679                 (FloatAutos *)edit->track->automation->autos[AUTOMATION_SPEED];
 680         double project_zoom = mwindow->edl->local_session->zoom_sample;
 681         int64_t edit_position = (x + pixmap->pixmap_x - virtual_edit_x) * project_zoom;
 682         int64_t start_position = edit->startsource;
 683         start_position += !speed_autos ? edit_position :
 684                 speed_autos->automation_integral(edit->startproject, edit_position, PLAY_FORWARD);
 685         int64_t end_position = edit->startsource;
 686         edit_position = (x + w + pixmap->pixmap_x - virtual_edit_x) * project_zoom;
 687         end_position += !speed_autos ? edit_position :
 688                 speed_autos->automation_integral(edit->startproject, edit_position, PLAY_FORWARD);
 689         double session_sample_rate = mwindow->edl->session->sample_rate;
 690         double asset_over_session = (double)indexable->get_sample_rate() / session_sample_rate;
 691         int64_t start_source = start_position * asset_over_session;
 692         if( start_source < 0 ) start_source = 0;
 693         int64_t start_index = start_source / index_state->index_zoom;
 694         int64_t end_source = end_position * asset_over_session;
 695         if( end_source < 0 ) end_source = 0;
 696         int64_t end_index = end_source / index_state->index_zoom;
 697 // start/length of index to read in floats
 698         start_index *= 2;  end_index *= 2;
 699 // length of index available in floats
 700         int64_t size_index = index_state->index_status == INDEX_BUILDING ?
 701                 index_state->get_channel_used(edit->channel) * 2 :
 702                 index_state->get_index_size(edit->channel);
 703 // Clamp length of index to read by available data
 704         if( end_index >= size_index ) end_index = size_index;
 705         int64_t length_index = end_index - start_index;
 706         if( length_index <= 0 ) return 0;
 707
 708 // Start and length of fragment to read from file in bytes.
 709         float *buffer = 0;
 710         int buffer_shared = 0;
 711         int rect_audio = mwindow->preferences->rectify_audio;
 712         int data_h = edit->track->data_h;
 713         int center_pixel = !rect_audio ? data_h/2 : data_h;
 714         if( edit->track->show_titles() )
 715                 center_pixel += mwindow->theme->get_image("title_bg_data")->get_h();
 716
 717         if( index_state->index_status == INDEX_BUILDING ) {
 718 // index is in RAM, being built
 719                 buffer = index_state->get_channel_buffer(edit->channel);
 720                 if( !buffer ) return 0;
 721                 buffer += start_index;
 722                 buffer_shared = 1;
 723         }
 724         else {
 725                 buffer = new float[length_index + 1];
 726                 int64_t length_buffer = length_index * sizeof(float);
 727 // add file/channel offset
 728                 int64_t index_offset = index_state->get_index_offset(edit->channel);
 729                 int64_t file_offset = (index_offset + start_index) * sizeof(float);
 730                 int64_t file_pos = index_state->index_start + file_offset;
 731                 int64_t read_length = file_length - file_pos;
 732                 if( read_length > length_buffer )
 733                         read_length = length_buffer;
 734                 int64_t length_read = 0;
 735                 if( read_length > 0 ) {
 736                         fseek(fd, file_pos, SEEK_SET);
 737                         length_read = fread(buffer, 1, read_length + sizeof(float), fd);
 738                         length_read &= ~(sizeof(float)-1);
 739                 }
 740                 if( (read_length-=length_read) > 0 )
 741                         memset((char*)buffer + length_read, 0, read_length);
 742                 buffer_shared = 0;
 743         }
 744
 745         canvas->set_color(mwindow->theme->audio_color);
 746
 747         int prev_y1 = center_pixel;
 748         int prev_y2 = center_pixel;
 749         int first_frame = 1;
 750         int zoom_y = mwindow->edl->local_session->zoom_y * data_h /
 751                         mwindow->edl->local_session->zoom_atrack;
 752         if( !rect_audio ) zoom_y /= 2;
 753         int max_y = center_pixel + zoom_y - 1;
 754         edit_position = (x + pixmap->pixmap_x - virtual_edit_x) * project_zoom;
 755         int64_t speed_position = edit->startsource;
 756         speed_position += !speed_autos ? edit_position :
 757                 speed_autos->automation_integral(edit->startproject, edit_position, PLAY_FORWARD);
 758         int64_t source_position  = speed_position * asset_over_session;
 759         int64_t index_position = source_position / index_state->index_zoom;
 760         int64_t i = 2 * index_position - start_index;
 761         CLAMP(i, 0, length_index);
 762 SET_TRACE
 763
 764         for( int64_t x1=0; x1<w && i < length_index; ++x1 ) {
 765                 float highsample = !rect_audio ? buffer[i] : fabsf(buffer[i]);  ++i;
 766                 float lowsample  = !rect_audio ? buffer[i] : fabsf(buffer[i]);  ++i;
 767                 int x2 = x1 + x + 1;
 768                 edit_position = (x2 + pixmap->pixmap_x - virtual_edit_x) * project_zoom;
 769                 int64_t speed_position = edit->startsource;
 770                 speed_position += !speed_autos ? edit_position :
 771                         speed_autos->automation_integral(edit->startproject, edit_position, PLAY_FORWARD);
 772                 source_position  = speed_position * asset_over_session;
 773                 index_position = source_position / index_state->index_zoom;
 774                 int64_t k = 2 * index_position - start_index;
 775                 CLAMP(k, 0, length_index);
 776                 while( i < k ) {
 777                         float high = !rect_audio ? buffer[i] : fabsf(buffer[i]);
 778                         highsample = MAX(highsample, high); ++i;
 779                         float low  = !rect_audio ? buffer[i] : fabsf(buffer[i]);
 780                         lowsample = MIN(lowsample, low);   ++i;
 781                 }
 782
 783                 int y1 = (int)(center_pixel - highsample * zoom_y);
 784                 int y2 = (int)(center_pixel - lowsample * zoom_y);
 785                 CLAMP(y1, 0, max_y);  int next_y1 = y1;
 786                 CLAMP(y2, 0, max_y);  int next_y2 = y2;
 787 //printf("draw_line (%f,%f) = %d,%d,  %d,%d\n", lowsample, highsample, x2, y1, x2, y2);
 788
 789 //SET_TRACE
 790 // A different algorithm has to be used if it's 1 sample per pixel and the
 791 // index is used.  Now the min and max values are equal so we join the max samples.
 792                 if(mwindow->edl->local_session->zoom_sample == 1) {
 793                         canvas->draw_bline(x2 - 1, !rect_audio ? prev_y1 : center_pixel, x2, y1, pixmap);
 794                 }
 795                 else {
 796 // Extend line height if it doesn't connect to previous line
 797                         if(!first_frame) {
 798                                 if(y1 > prev_y2) y1 = prev_y2 + 1;
 799                                 if(y2 < prev_y1) y2 = prev_y1 - 1;
 800                         }
 801                         else {
 802                                 first_frame = 0;
 803                         }
 804                         canvas->draw_bline(x2, y1, x2, !rect_audio ? y2 : center_pixel, pixmap);
 805                 }
 806                 prev_y1 = next_y1;
 807                 prev_y2 = next_y2;
 808         }
 809
 810 SET_TRACE
 811
 812         if(!buffer_shared) delete [] buffer;
 813 SET_TRACE
 814         if(debug) printf("IndexFile::draw_index %d\n", __LINE__);
 815         return 0;
 816 }
 817
 818 int IndexFile::close_index()
 819 {
 820         if(fd)
 821         {
 822                 fclose(fd);
 823                 fd = 0;
 824         }
 825         return 0;
 826 }
 827
 828 int IndexFile::remove_index()
 829 {
 830         IndexState *index_state = get_state();
 831         if(index_state->index_status == INDEX_READY ||
 832                 index_state->index_status == INDEX_NOTTESTED)
 833         {
 834                 close_index();
 835                 remove(index_filename);
 836         }
 837         return 0;
 838 }
 839
 840 int IndexFile::read_info(Indexable *test_indexable)
 841 {
 842         const int debug = 0;
 843
 844 // Store format in actual asset.
 845 // If it's a nested EDL, we never want the format, just the index info.
 846         if(!test_indexable) test_indexable = indexable;
 847         if(!test_indexable) return 1;
 848
 849         IndexState * index_state = test_indexable->index_state;
 850         if(index_state->index_status == INDEX_NOTTESTED)
 851         {
 852 // read start of index data
 853                 int temp = fread((char*)&(index_state->index_start), sizeof(int64_t), 1, fd);
 854 //printf("IndexFile::read_info %d %f\n", __LINE__, test_indexable->get_frame_rate());
 855
 856                 if(!temp) return 1;
 857 // read test_indexable info from index
 858                 char *data;
 859
 860                 data = new char[index_state->index_start];
 861                 temp = fread(data, index_state->index_start - sizeof(int64_t), 1, fd);
 862                 if(!temp) return 1;
 863
 864                 data[index_state->index_start - sizeof(int64_t)] = 0;
 865                 FileXML xml;
 866                 xml.read_from_string(data);
 867                 delete [] data;
 868
 869
 870
 871 // Read the file format & index state.
 872                 if(test_indexable->is_asset)
 873                 {
 874                         Asset *test_asset = (Asset *)test_indexable;
 875                         Asset *asset = new Asset;
 876                         asset->read(&xml);
 877                         int ret = 0;
 878 //printf("IndexFile::read_info %d %f\n", __LINE__, asset->get_frame_rate());
 879
 880                         if( asset->format == FILE_UNKNOWN ||
 881                             test_asset->format != asset->format ) {
 882 if(debug) printf("IndexFile::read_info %d\n", __LINE__);
 883                                 ret = 1;
 884                         }
 885                         asset->remove_user();
 886                         if( ret ) return ret;
 887                 }
 888                 else
 889                 {
 890 // Read only the index state for a nested EDL
 891                         int result = 0;
 892 if(debug) printf("IndexFile::read_info %d\n", __LINE__);
 893                         while(!result)
 894                         {
 895                                 result = xml.read_tag();
 896                                 if(!result)
 897                                 {
 898                                         if(xml.tag.title_is("INDEX"))
 899                                         {
 900                                                 index_state->read_xml(&xml, source_channels);
 901 if(debug) printf("IndexFile::read_info %d\n", __LINE__);
 902 if(debug) index_state->dump();
 903                                                 result = 1;
 904                                         }
 905                                 }
 906                         }
 907                 }
 908         }
 909
 910         return 0;
 911 }
 912
 913
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