libhb/work.c

   1 /* $Id: work.c,v 1.43 2005/03/17 16:38:49 titer Exp $
   2
   3    This file is part of the HandBrake source code.
   4    Homepage: <http://handbrake.m0k.org/>.
   5    It may be used under the terms of the GNU General Public License. */
   6
   7 #include "hb.h"
   8 #include "a52dec/a52.h"
   9 #include "dca.h"
  10
  11 typedef struct
  12 {
  13     hb_list_t * jobs;
  14     int         cpu_count;
  15     int       * error;
  16     volatile int * die;
  17
  18 } hb_work_t;
  19
  20 static void work_func();
  21 static void do_job( hb_job_t *, int cpu_count );
  22 static void work_loop( void * );
  23
  24 /**
  25  * Allocates work object and launches work thread with work_func.
  26  * @param jobs Handle to hb_list_t.
  27  * @param cpu_count Humber of CPUs found in system.
  28  * @param die Handle to user inititated exit indicator.
  29  * @param error Handle to error indicator.
  30  */
  31 hb_thread_t * hb_work_init( hb_list_t * jobs, int cpu_count,
  32                             volatile int * die, int * error )
  33 {
  34     hb_work_t * work = calloc( sizeof( hb_work_t ), 1 );
  35
  36     work->jobs      = jobs;
  37     work->cpu_count = cpu_count;
  38     work->die       = die;
  39     work->error     = error;
  40
  41     return hb_thread_init( "work", work_func, work, HB_LOW_PRIORITY );
  42 }
  43
  44 /**
  45  * Iterates through job list and calls do_job for each job.
  46  * @param _work Handle work object.
  47  */
  48 static void work_func( void * _work )
  49 {
  50     hb_work_t  * work = _work;
  51     hb_job_t   * job;
  52
  53     hb_log( "%d job(s) to process", hb_list_count( work->jobs ) );
  54
  55     while( !*work->die && ( job = hb_list_item( work->jobs, 0 ) ) )
  56     {
  57         hb_list_rem( work->jobs, job );
  58         job->die = work->die;
  59         do_job( job, work->cpu_count );
  60     }
  61
  62     *(work->error) = HB_ERROR_NONE;
  63
  64     free( work );
  65 }
  66
  67 static hb_work_object_t * getWork( int id )
  68 {
  69     hb_work_object_t * w;
  70     for( w = hb_objects; w; w = w->next )
  71     {
  72         if( w->id == id )
  73         {
  74             return w;
  75         }
  76     }
  77     return NULL;
  78 }
  79
  80 /**
  81  * Job initialization rountine.
  82  * Initializes fifos.
  83  * Creates work objects for synchronizer, video decoder, video renderer, video decoder, audio decoder, audio encoder, reader, muxer.
  84  * Launches thread for each work object with work_loop.
  85  * Loops while monitoring status of work threads and fifos.
  86  * Exits loop when conversion is done and fifos are empty.
  87  * Closes threads and frees fifos.
  88  * @param job Handle work hb_job_t.
  89  * @param cpu_count number of CPUs found in system.
  90  */
  91 static void do_job( hb_job_t * job, int cpu_count )
  92 {
  93     hb_title_t    * title;
  94     int             i, j;
  95     hb_work_object_t * w;
  96
  97     /* FIXME: This feels really hackish, anything better? */
  98     hb_work_object_t * audio_w = NULL;
  99
 100     hb_audio_t   * audio;
 101     hb_subtitle_t * subtitle;
 102     int done;
 103     unsigned int subtitle_highest = 0;
 104     unsigned int subtitle_highest_id = 0;
 105     unsigned int subtitle_lowest = -1;
 106     unsigned int subtitle_lowest_id = 0;
 107     unsigned int subtitle_hit = 0;
 108
 109     title = job->title;
 110
 111     job->list_work = hb_list_init();
 112
 113     hb_log( "starting job" );
 114     hb_log( " + device %s", title->dvd );
 115     hb_log( " + title %d, chapter(s) %d to %d", title->index,
 116             job->chapter_start, job->chapter_end );
 117     if ( job->pixel_ratio == 1 )
 118     {
 119         /* Correct the geometry of the output movie when using PixelRatio */
 120         job->height=title->height-job->crop[0]-job->crop[1];
 121         job->width=title->width-job->crop[2]-job->crop[3];
 122     }
 123
 124         /* Keep width and height within these boundaries */
 125         if (job->maxHeight && (job->height > job->maxHeight) )
 126         {
 127                 job->height = job->maxHeight;
 128                 hb_fix_aspect( job, HB_KEEP_HEIGHT );
 129                 hb_log("Height out of bounds, scaling down to %i", job->maxHeight);
 130                 hb_log("New dimensions %i * %i", job->width, job->height);
 131         }
 132         if (job->maxWidth && (job->width > job->maxWidth) )
 133         {
 134                 job->width = job->maxWidth;
 135                 hb_fix_aspect( job, HB_KEEP_WIDTH );
 136                 hb_log("Width out of bounds, scaling down to %i", job->maxWidth);
 137                 hb_log("New dimensions %i * %i", job->width, job->height);
 138         }
 139
 140     hb_log( " + %dx%d -> %dx%d, crop %d/%d/%d/%d",
 141             title->width, title->height, job->width, job->height,
 142             job->crop[0], job->crop[1], job->crop[2], job->crop[3] );
 143     hb_log( " + grayscale %s", job->grayscale ? "on" : "off" );
 144
 145     if( job->filters )
 146     {
 147         for( i = 0; i < hb_list_count( job->filters ); i++ )
 148         {
 149             hb_filter_object_t * filter = hb_list_item( job->filters, i );
 150             hb_log(" + filter: %s", filter->name);
 151             if (filter->settings)
 152                 hb_log("   + settings: %s", filter->settings);
 153             else
 154                 hb_log("   + settings: default");
 155         }
 156     }
 157
 158     if( job->vquality >= 0.0 && job->vquality <= 1.0 )
 159     {
 160         hb_log( " + %.3f fps, video quality %.2f", (float) job->vrate /
 161                 (float) job->vrate_base, job->vquality );
 162     }
 163     else
 164     {
 165         hb_log( " + %.3f fps, video bitrate %d kbps, pass %d",
 166                 (float) job->vrate / (float) job->vrate_base,
 167                 job->vbitrate, job->pass );
 168     }
 169         hb_log (" + PixelRatio: %d, width:%d, height: %d",job->pixel_ratio,job->width, job->height);
 170     job->fifo_mpeg2  = hb_fifo_init( 2048 );
 171     job->fifo_raw    = hb_fifo_init( 8 );
 172     job->fifo_sync   = hb_fifo_init( 8 );
 173     job->fifo_render = hb_fifo_init( 8 );
 174     job->fifo_mpeg4  = hb_fifo_init( 8 );
 175
 176     /* Synchronization */
 177     hb_list_add( job->list_work, ( w = getWork( WORK_SYNC ) ) );
 178     w->fifo_in  = NULL;
 179     w->fifo_out = NULL;
 180
 181     /* Video decoder */
 182     hb_list_add( job->list_work, ( w = getWork( WORK_DECMPEG2 ) ) );
 183     w->fifo_in  = job->fifo_mpeg2;
 184     w->fifo_out = job->fifo_raw;
 185
 186     /* Video renderer */
 187     hb_list_add( job->list_work, ( w = getWork( WORK_RENDER ) ) );
 188     w->fifo_in  = job->fifo_sync;
 189     w->fifo_out = job->fifo_render;
 190
 191     /* Video encoder */
 192     switch( job->vcodec )
 193     {
 194         case HB_VCODEC_FFMPEG:
 195             hb_log( " + encoder FFmpeg" );
 196             w = getWork( WORK_ENCAVCODEC );
 197             break;
 198         case HB_VCODEC_XVID:
 199             hb_log( " + encoder XviD" );
 200             w = getWork( WORK_ENCXVID );
 201             break;
 202         case HB_VCODEC_X264:
 203             hb_log( " + encoder x264" );
 204             w = getWork( WORK_ENCX264 );
 205             break;
 206     }
 207     w->fifo_in  = job->fifo_render;
 208     w->fifo_out = job->fifo_mpeg4;
 209     w->config   = &job->config;
 210
 211     hb_list_add( job->list_work, w );
 212
 213     if( job->select_subtitle && !job->subtitle_scan )
 214     {
 215         /*
 216          * Must be second pass of a two pass with subtitle scan enabled, so
 217          * add the subtitle that we found on the first pass for use in this
 218          * pass.
 219          */
 220         hb_list_add( title->list_subtitle, *( job->select_subtitle ) );
 221     }
 222
 223     for( i=0; i < hb_list_count(title->list_subtitle); i++ )
 224     {
 225         subtitle =  hb_list_item( title->list_subtitle, i );
 226
 227         if( subtitle )
 228         {
 229             hb_log( " + subtitle %x, %s", subtitle->id, subtitle->lang );
 230
 231             subtitle->fifo_in  = hb_fifo_init( 8 );
 232             subtitle->fifo_raw = hb_fifo_init( 8 );
 233
 234             if (!job->subtitle_scan) {
 235                 /*
 236                  * Don't add threads for subtitles when we are scanning
 237                  */
 238                 hb_list_add( job->list_work, ( w = getWork( WORK_DECSUB ) ) );
 239                 w->fifo_in  = subtitle->fifo_in;
 240                 w->fifo_out = subtitle->fifo_raw;
 241             }
 242         }
 243     }
 244
 245     if( job->acodec & HB_ACODEC_AC3 )
 246     {
 247         hb_log( " + audio AC3 passthrough" );
 248     }
 249     else
 250     {
 251         hb_log( " + audio %d kbps, %d Hz", job->abitrate, job->arate );
 252         hb_log( " + encoder %s", ( job->acodec & HB_ACODEC_FAAC ) ?
 253                 "faac" : ( ( job->acodec & HB_ACODEC_LAME ) ? "lame" :
 254                 "vorbis" ) );
 255     }
 256
 257     /* if we are doing AC3 passthru, then remove any non-AC3 audios from the job */
 258     /* otherwise, Bad Things will happen */
 259     for( i = 0; i < hb_list_count( title->list_audio ); )
 260     {
 261         audio = hb_list_item( title->list_audio, i );
 262         if( ( job->acodec & HB_ACODEC_AC3 ) && ( audio->codec != HB_ACODEC_AC3 ) )
 263         {
 264             hb_list_rem( title->list_audio, audio );
 265             free( audio );
 266             continue;
 267         }
 268         i++;
 269     }
 270
 271     for( i = 0; i < hb_list_count( title->list_audio ); i++ )
 272     {
 273         audio = hb_list_item( title->list_audio, i );
 274         hb_log( "   + %x, %s", audio->id, audio->lang );
 275
 276                 /* sense-check the current mixdown options */
 277
 278                 /* log the requested mixdown */
 279                 for (j = 0; j < hb_audio_mixdowns_count; j++) {
 280                         if (hb_audio_mixdowns[j].amixdown == job->audio_mixdowns[i]) {
 281                                 hb_log( "     + Requested mixdown: %s (%s)", hb_audio_mixdowns[j].human_readable_name, hb_audio_mixdowns[j].internal_name );
 282                                 break;
 283                         }
 284                 }
 285
 286         /* sense-check the requested mixdown */
 287
 288         /* audioCodecsSupportMono and audioCodecsSupport6Ch are the same for now,
 289            but this may change in the future, so they are separated for flexibility */
 290         int audioCodecsSupportMono = ((audio->codec == HB_ACODEC_AC3 ||
 291             audio->codec == HB_ACODEC_DCA) && job->acodec == HB_ACODEC_FAAC);
 292         int audioCodecsSupport6Ch =  ((audio->codec == HB_ACODEC_AC3 ||
 293             audio->codec == HB_ACODEC_DCA) && job->acodec == HB_ACODEC_FAAC);
 294
 295         /* find out what the format of our source audio is */
 296         switch (audio->input_channel_layout & HB_INPUT_CH_LAYOUT_DISCRETE_NO_LFE_MASK) {
 297
 298             /* mono sources */
 299             case HB_INPUT_CH_LAYOUT_MONO:
 300                 /* regardless of what stereo mixdown we've requested, a mono source always get mixed down
 301                 to mono if we can, and mixed up to stereo if we can't */
 302                 if (job->audio_mixdowns[i] == HB_AMIXDOWN_MONO && audioCodecsSupportMono == 1) {
 303                     job->audio_mixdowns[i] = HB_AMIXDOWN_MONO;
 304                 } else {
 305                     job->audio_mixdowns[i] = HB_AMIXDOWN_STEREO;
 306                 }
 307                 break;
 308
 309             /* stereo input */
 310             case HB_INPUT_CH_LAYOUT_STEREO:
 311                 /* if we've requested a mono mixdown, and it is supported, then do the mix */
 312                 /* use stereo if not supported */
 313                 if (job->audio_mixdowns[i] == HB_AMIXDOWN_MONO && audioCodecsSupportMono == 0) {
 314                     job->audio_mixdowns[i] = HB_AMIXDOWN_STEREO;
 315                 /* otherwise, preserve stereo regardless of if we requested something higher */
 316                 } else if (job->audio_mixdowns[i] > HB_AMIXDOWN_STEREO) {
 317                     job->audio_mixdowns[i] = HB_AMIXDOWN_STEREO;
 318                 }
 319                 break;
 320
 321             /* dolby (DPL1 aka Dolby Surround = 4.0 matrix-encoded) input */
 322             /* the A52 flags don't allow for a way to distinguish between DPL1 and DPL2 on a DVD,
 323                so we always assume a DPL1 source for A52_DOLBY */
 324             case HB_INPUT_CH_LAYOUT_DOLBY:
 325                 /* if we've requested a mono mixdown, and it is supported, then do the mix */
 326                 /* preserve dolby if not supported */
 327                 if (job->audio_mixdowns[i] == HB_AMIXDOWN_MONO && audioCodecsSupportMono == 0) {
 328                     job->audio_mixdowns[i] = HB_AMIXDOWN_DOLBY;
 329                 /* otherwise, preserve dolby even if we requested something higher */
 330                 /* a stereo mixdown will still be honoured here */
 331                 } else if (job->audio_mixdowns[i] > HB_AMIXDOWN_DOLBY) {
 332                     job->audio_mixdowns[i] = HB_AMIXDOWN_DOLBY;
 333                 }
 334                 break;
 335
 336             /* 3F/2R input */
 337             case HB_INPUT_CH_LAYOUT_3F2R:
 338                 /* if we've requested a mono mixdown, and it is supported, then do the mix */
 339                 /* use dpl2 if not supported */
 340                 if (job->audio_mixdowns[i] == HB_AMIXDOWN_MONO && audioCodecsSupportMono == 0) {
 341                     job->audio_mixdowns[i] = HB_AMIXDOWN_DOLBYPLII;
 342                 } else {
 343                     /* check if we have 3F2R input and also have an LFE - i.e. we have a 5.1 source) */
 344                     if (audio->input_channel_layout & HB_INPUT_CH_LAYOUT_HAS_LFE) {
 345                         /* we have a 5.1 source */
 346                         /* if we requested 6ch, but our audio format doesn't support it, then mix to DPLII instead */
 347                         if (job->audio_mixdowns[i] == HB_AMIXDOWN_6CH && audioCodecsSupport6Ch == 0) {
 348                             job->audio_mixdowns[i] = HB_AMIXDOWN_DOLBYPLII;
 349                         }
 350                     } else {
 351                         /* we have a 5.0 source, so we can't do 6ch conversion
 352                         default to DPL II instead */
 353                         if (job->audio_mixdowns[i] > HB_AMIXDOWN_DOLBYPLII) {
 354                             job->audio_mixdowns[i] = HB_AMIXDOWN_DOLBYPLII;
 355                         }
 356                     }
 357                 }
 358                 /* all other mixdowns will have been preserved here */
 359                 break;
 360
 361             /* 3F/1R input */
 362             case HB_INPUT_CH_LAYOUT_3F1R:
 363                 /* if we've requested a mono mixdown, and it is supported, then do the mix */
 364                 /* use dpl1 if not supported */
 365                 if (job->audio_mixdowns[i] == HB_AMIXDOWN_MONO && audioCodecsSupportMono == 0) {
 366                     job->audio_mixdowns[i] = HB_AMIXDOWN_DOLBY;
 367                 } else {
 368                     /* we have a 4.0 or 4.1 source, so we can't do DPLII or 6ch conversion
 369                     default to DPL I instead */
 370                     if (job->audio_mixdowns[i] > HB_AMIXDOWN_DOLBY) {
 371                         job->audio_mixdowns[i] = HB_AMIXDOWN_DOLBY;
 372                     }
 373                 }
 374                 /* all other mixdowns will have been preserved here */
 375                 break;
 376
 377             default:
 378                 /* if we've requested a mono mixdown, and it is supported, then do the mix */
 379                 if (job->audio_mixdowns[i] == HB_AMIXDOWN_MONO && audioCodecsSupportMono == 1) {
 380                     job->audio_mixdowns[i] = HB_AMIXDOWN_MONO;
 381                 /* mix everything else down to stereo */
 382                 } else {
 383                     job->audio_mixdowns[i] = HB_AMIXDOWN_STEREO;
 384                 }
 385
 386         }
 387
 388                 /* log the output mixdown */
 389                 for (j = 0; j < hb_audio_mixdowns_count; j++) {
 390                         if (hb_audio_mixdowns[j].amixdown == job->audio_mixdowns[i]) {
 391                                 hb_log( "     + Actual mixdown: %s (%s)", hb_audio_mixdowns[j].human_readable_name, hb_audio_mixdowns[j].internal_name );
 392                                 break;
 393                         }
 394                 }
 395
 396                 /* we now know we have a valid mixdown for the input source and the audio output format */
 397                 /* remember the mixdown for this track */
 398                 audio->amixdown = job->audio_mixdowns[i];
 399
 400         audio->config.vorbis.language = audio->lang_simple;
 401
 402                 /* set up the audio work structures */
 403         audio->fifo_in   = hb_fifo_init( 2048 );
 404         audio->fifo_raw  = hb_fifo_init( 8 );
 405         audio->fifo_sync = hb_fifo_init( 8 );
 406         audio->fifo_out  = hb_fifo_init( 8 );
 407
 408         switch( audio->codec )
 409         {
 410             case HB_ACODEC_AC3:
 411                 w = getWork( WORK_DECA52 );
 412                 break;
 413             case HB_ACODEC_DCA:
 414                 w = getWork( WORK_DECDCA );
 415                 break;
 416             case HB_ACODEC_MPGA:
 417                 w = getWork( WORK_DECAVCODEC );
 418                 break;
 419             case HB_ACODEC_LPCM:
 420                 w = getWork( WORK_DECLPCM );
 421                 break;
 422         }
 423         w->fifo_in       = audio->fifo_in;
 424         w->fifo_out      = audio->fifo_raw;
 425         w->config        = &audio->config;
 426         w->amixdown      = audio->amixdown;
 427         w->source_acodec = audio->codec;
 428
 429         /* FIXME: This feels really hackish, anything better? */
 430         audio_w = calloc( sizeof( hb_work_object_t ), 1 );
 431         audio_w = memcpy( audio_w, w, sizeof( hb_work_object_t ));
 432
 433         hb_list_add( job->list_work, audio_w );
 434
 435         switch( job->acodec )
 436         {
 437             case HB_ACODEC_FAAC:
 438                 w = getWork( WORK_ENCFAAC );
 439                 break;
 440             case HB_ACODEC_LAME:
 441                 w = getWork( WORK_ENCLAME );
 442                 break;
 443             case HB_ACODEC_VORBIS:
 444                 w = getWork( WORK_ENCVORBIS );
 445                 break;
 446         }
 447
 448         if( job->acodec != HB_ACODEC_AC3 )
 449         {
 450             w->fifo_in       = audio->fifo_sync;
 451             w->fifo_out      = audio->fifo_out;
 452             w->config        = &audio->config;
 453             w->amixdown      = audio->amixdown;
 454             w->source_acodec = audio->codec;
 455
 456             /* FIXME: This feels really hackish, anything better? */
 457             audio_w = calloc( sizeof( hb_work_object_t ), 1 );
 458             audio_w = memcpy( audio_w, w, sizeof( hb_work_object_t ));
 459
 460             hb_list_add( job->list_work, audio_w );
 461         }
 462
 463
 464     }
 465
 466     /* Init read & write threads */
 467     job->reader = hb_reader_init( job );
 468
 469     hb_log( " + output: %s", job->file );
 470     job->muxer = hb_muxer_init( job );
 471
 472     job->done = 0;
 473
 474     /* Launch processing threads */
 475     for( i = 1; i < hb_list_count( job->list_work ); i++ )
 476     {
 477         w = hb_list_item( job->list_work, i );
 478         w->done = &job->done;
 479                 w->thread_sleep_interval = 10;
 480         w->init( w, job );
 481         w->thread = hb_thread_init( w->name, work_loop, w,
 482                                     HB_LOW_PRIORITY );
 483     }
 484
 485     done = 0;
 486     w = hb_list_item( job->list_work, 0 );
 487         w->thread_sleep_interval = 50;
 488     w->init( w, job );
 489     while( !*job->die )
 490     {
 491         if( w->work( w, NULL, NULL ) == HB_WORK_DONE )
 492         {
 493             done = 1;
 494         }
 495         if( done &&
 496             !hb_fifo_size( job->fifo_sync ) &&
 497             !hb_fifo_size( job->fifo_render ) &&
 498             !hb_fifo_size( job->fifo_mpeg4 ) )
 499         {
 500             break;
 501         }
 502         hb_snooze( w->thread_sleep_interval );
 503     }
 504     hb_list_rem( job->list_work, w );
 505     w->close( w );
 506     job->done = 1;
 507
 508     /* Close work objects */
 509     while( ( w = hb_list_item( job->list_work, 0 ) ) )
 510     {
 511         hb_list_rem( job->list_work, w );
 512         hb_thread_close( &w->thread );
 513         w->close( w );
 514
 515         /* FIXME: This feels really hackish, anything better? */
 516         if ( w->id == WORK_DECA52 ||
 517              w->id == WORK_DECDCA ||
 518              w->id == WORK_DECLPCM ||
 519              w->id == WORK_ENCFAAC ||
 520              w->id == WORK_ENCLAME ||
 521              w->id == WORK_ENCVORBIS )
 522         {
 523             free( w );
 524             w = NULL;
 525         }
 526     }
 527
 528     hb_list_close( &job->list_work );
 529
 530     /* Stop read & write threads */
 531     hb_thread_close( &job->reader );
 532     hb_thread_close( &job->muxer );
 533
 534     /* Close fifos */
 535     hb_fifo_close( &job->fifo_mpeg2 );
 536     hb_fifo_close( &job->fifo_raw );
 537     hb_fifo_close( &job->fifo_sync );
 538     hb_fifo_close( &job->fifo_render );
 539     hb_fifo_close( &job->fifo_mpeg4 );
 540     for (i=0; i < hb_list_count(title->list_subtitle); i++) {
 541         subtitle =  hb_list_item( title->list_subtitle, i);
 542         if( subtitle )
 543         {
 544             hb_fifo_close( &subtitle->fifo_in );
 545             hb_fifo_close( &subtitle->fifo_raw );
 546         }
 547     }
 548     for( i = 0; i < hb_list_count( title->list_audio ); i++ )
 549     {
 550         audio = hb_list_item( title->list_audio, i );
 551         hb_fifo_close( &audio->fifo_in );
 552         hb_fifo_close( &audio->fifo_raw );
 553         hb_fifo_close( &audio->fifo_sync );
 554         hb_fifo_close( &audio->fifo_out );
 555     }
 556
 557     if( job->subtitle_scan )
 558     {
 559         /*
 560          * Before closing the title print out our subtitle stats if we need to
 561          * Find the highest and lowest.
 562          */
 563         for( i=0; i < hb_list_count( title->list_subtitle ); i++ )
 564         {
 565             subtitle =  hb_list_item( title->list_subtitle, i );
 566             hb_log( "Subtitle stream 0x%x '%s': %d hits",
 567                     subtitle->id, subtitle->lang, subtitle->hits );
 568             if( subtitle->hits > subtitle_highest )
 569             {
 570                 subtitle_highest = subtitle->hits;
 571                 subtitle_highest_id = subtitle->id;
 572             }
 573
 574             if( subtitle->hits < subtitle_lowest )
 575             {
 576                 subtitle_lowest = subtitle->hits;
 577                 subtitle_lowest_id = subtitle->id;
 578             }
 579         }
 580
 581         if( job->native_language ) {
 582             /*
 583              * We still have a native_language, so the audio and subtitles are
 584              * different, so in this case it is a foreign film and we want to
 585              * select the subtitle with the highest hits in our language.
 586              */
 587             subtitle_hit = subtitle_highest_id;
 588             hb_log( "Found a native-language subtitle id 0x%x", subtitle_hit);
 589         } else {
 590             if( subtitle_lowest < subtitle_highest )
 591             {
 592                 /*
 593                  * OK we have more than one, and the lowest is lower, but how much
 594                  * lower to qualify for turning it on by default?
 595                  *
 596                  * Let's say 10% as a default.
 597                  */
 598                 if( subtitle_lowest < ( subtitle_highest * 0.1 ) )
 599                 {
 600                     subtitle_hit = subtitle_lowest_id;
 601                     hb_log( "Found a subtitle candidate id 0x%x",
 602                             subtitle_hit );
 603                 } else {
 604                     hb_log( "No candidate subtitle detected during subtitle-scan");
 605                 }
 606             }
 607         }
 608     }
 609
 610     if( job->select_subtitle )
 611     {
 612         if( job->subtitle_scan )
 613         {
 614             for( i=0; i < hb_list_count( title->list_subtitle ); i++ )
 615             {
 616                 subtitle =  hb_list_item( title->list_subtitle, i );
 617                 if( subtitle->id = subtitle_hit )
 618                 {
 619                     hb_list_rem( title->list_subtitle, subtitle );
 620                     *( job->select_subtitle ) = subtitle;
 621                 }
 622             }
 623         } else {
 624             /*
 625              * Must be the second pass - we don't need this anymore.
 626              */
 627             free( job->select_subtitle );
 628             job->select_subtitle = NULL;
 629         }
 630     }
 631
 632     hb_title_close( &job->title );
 633     free( job );
 634 }
 635
 636 /**
 637  * Performs the work objects specific work function.
 638  * Loops calling work function for associated work object. Sleeps when fifo is full.
 639  * Monitors work done indicator.
 640  * Exits loop when work indiactor is set.
 641  * @param _w Handle to work object.
 642  */
 643 static void work_loop( void * _w )
 644 {
 645     hb_work_object_t * w = _w;
 646     hb_buffer_t      * buf_in, * buf_out;
 647
 648     while( !*w->done )
 649     {
 650 #if 0
 651         hb_lock( job->pause );
 652         hb_unlock( job->pause );
 653 #endif
 654         if( hb_fifo_is_full( w->fifo_out ) ||
 655 //        if( (hb_fifo_percent_full( w->fifo_out ) > 0.8) ||
 656             !( buf_in = hb_fifo_get( w->fifo_in ) ) )
 657         {
 658             hb_snooze( w->thread_sleep_interval );
 659 //                      w->thread_sleep_interval += 1;
 660             continue;
 661         }
 662 //              w->thread_sleep_interval = MAX(1, (w->thread_sleep_interval - 1));
 663
 664         w->work( w, &buf_in, &buf_out );
 665
 666         // Propogate any chapter breaks for the worker
 667         if( buf_in && buf_out && buf_in->new_chap )
 668         {
 669             printf("WORK: Copying Chapter Break\n");
 670             buf_out->new_chap = 1;
 671         }
 672
 673         if( buf_in )
 674         {
 675             hb_buffer_close( &buf_in );
 676         }
 677         if( buf_out )
 678         {
 679             hb_fifo_push( w->fifo_out, buf_out );
 680         }
 681     }
 682 }