libhb/decmpeg2.c

   1 /* $Id: decmpeg2.c,v 1.12 2005/03/03 16:30:42 titer Exp $
   2
   3    This file is part of the HandBrake source code.
   4    Homepage: <http://handbrake.fr/>.
   5    It may be used under the terms of the GNU General Public License. */
   6
   7 #include "hb.h"
   8 #include "hbffmpeg.h"
   9 #include "mpeg2dec/mpeg2.h"
  10
  11 /* Cadence tracking */
  12 #ifndef PIC_FLAG_REPEAT_FIRST_FIELD
  13 #define PIC_FLAG_REPEAT_FIRST_FIELD 256
  14 #endif
  15 #define TOP_FIRST PIC_FLAG_TOP_FIELD_FIRST
  16 #define PROGRESSIVE PIC_FLAG_PROGRESSIVE_FRAME
  17 #define COMPOSITE PIC_FLAG_COMPOSITE_DISPLAY
  18 #define SKIP PIC_FLAG_SKIP
  19 #define TAGS PIC_FLAG_TAGS
  20 #define REPEAT_FIRST PIC_FLAG_REPEAT_FIRST_FIELD
  21 #define COMPOSITE_MASK PIC_MASK_COMPOSITE_DISPLAY
  22 #define TB 8
  23 #define BT 16
  24 #define BT_PROG 32
  25 #define BTB_PROG 64
  26 #define TB_PROG 128
  27 #define TBT_PROG 256
  28
  29 /**********************************************************************
  30  * hb_libmpeg2_t
  31  *********************************************************************/
  32 typedef struct hb_libmpeg2_s
  33 {
  34     mpeg2dec_t         * libmpeg2;
  35     const mpeg2_info_t * info;
  36     hb_job_t           * job;
  37     hb_title_t         * title;
  38     int                  width;
  39     int                  height;
  40     int                  rate;
  41     double               aspect_ratio;
  42     int                  got_iframe;        /* set when we get our first iframe */
  43     int                  look_for_iframe;   /* need an iframe to add chap break */
  44     int                  look_for_break;    /* need gop start to add chap break */
  45     uint32_t             nframes;           /* number of frames we've decoded */
  46     int64_t              last_pts;
  47     int cadence[12];
  48     int flag;
  49     hb_subtitle_t      * subtitle;
  50 } hb_libmpeg2_t;
  51
  52 /**********************************************************************
  53  * hb_libmpeg2_init
  54  **********************************************************************
  55  *
  56  *********************************************************************/
  57 static hb_libmpeg2_t * hb_libmpeg2_init()
  58 {
  59     hb_libmpeg2_t * m = calloc( sizeof( hb_libmpeg2_t ), 1 );
  60
  61     m->libmpeg2 = mpeg2_init();
  62     m->info     = mpeg2_info( m->libmpeg2 );
  63     m->last_pts = -1;
  64
  65     return m;
  66 }
  67
  68 static void hb_mpeg2_cc( hb_libmpeg2_t * m, uint8_t *cc_block )
  69 {
  70     uint8_t cc_valid = (*cc_block & 4) >>2;
  71     uint8_t cc_type = *cc_block & 3;
  72     hb_buffer_t *cc_buf;
  73
  74     if( !m->job )
  75     {
  76         /*
  77          * Ignore CC decoding during scanning.
  78          */
  79         return;
  80     }
  81
  82     if (cc_valid || cc_type==3)
  83     {
  84         switch (cc_type)
  85         {
  86         case 0:
  87             // CC1 stream
  88             cc_buf = hb_buffer_init( 2 );
  89             if( cc_buf )
  90             {
  91                 cc_buf->start = m->last_pts;
  92                 memcpy( cc_buf->data, cc_block+1, 2 );
  93                 hb_fifo_push( m->subtitle->fifo_in, cc_buf );
  94             }
  95             break;
  96         case 1:
  97             // CC2 stream
  98             //process608( cc_block+1, 2, &m->cc608 );
  99             break;
 100         case 2: //EIA-708
 101             // DTVCC packet data
 102             // Fall through
 103         case 3: //EIA-708
 104         {
 105             uint8_t temp[4];
 106             temp[0]=cc_valid;
 107             temp[1]=cc_type;
 108             temp[2]=cc_block[1];
 109             temp[3]=cc_block[2];
 110             //do_708 ((const unsigned char *) temp, 4);
 111         }
 112         break;
 113         default:
 114             break;
 115         }
 116     }
 117     else
 118     {
 119         hb_log("Ignoring invalid CC block");
 120     }
 121 }
 122
 123 static hb_buffer_t *hb_copy_frame( hb_job_t *job, int width, int height,
 124                                    uint8_t* y, uint8_t *u, uint8_t *v )
 125 {
 126     int dst_w = width, dst_h = height;
 127     if ( job )
 128     {
 129         dst_w = job->title->width;
 130         dst_h = job->title->height;
 131     }
 132     int dst_wh = dst_w * dst_h;
 133     hb_buffer_t *buf  = hb_video_buffer_init( dst_w, dst_h );
 134
 135     if ( dst_w != width || dst_h != height )
 136     {
 137         // we're encoding and the frame dimensions don't match the title dimensions -
 138         // rescale & matte Y, U, V into our output buf.
 139         AVPicture in, out;
 140         avpicture_alloc(&in,  PIX_FMT_YUV420P, width, height );
 141         avpicture_alloc(&out, PIX_FMT_YUV420P, dst_w, dst_h );
 142
 143         int src_wh = width * height;
 144         memcpy( in.data[0], y, src_wh );
 145         memcpy( in.data[1], u, src_wh >> 2 );
 146         memcpy( in.data[2], v, src_wh >> 2 );
 147         struct SwsContext *context = sws_getContext( width, height, PIX_FMT_YUV420P,
 148                                                      dst_w, dst_h, PIX_FMT_YUV420P,
 149                                                      SWS_LANCZOS|SWS_ACCURATE_RND,
 150                                                      NULL, NULL, NULL );
 151         sws_scale( context, in.data, in.linesize, 0, height, out.data, out.linesize );
 152         sws_freeContext( context );
 153
 154         uint8_t *data = buf->data;
 155         memcpy( data, out.data[0], dst_wh );
 156         data += dst_wh;
 157         // U & V planes are 1/4 the size of Y plane.
 158         dst_wh >>= 2;
 159         memcpy( data, out.data[1], dst_wh );
 160         data += dst_wh;
 161         memcpy( data, out.data[2], dst_wh );
 162
 163         avpicture_free( &out );
 164         avpicture_free( &in );
 165     }
 166     else
 167     {
 168         // we're scanning or the frame dimensions match the title's dimensions
 169         // so we can do a straight copy.
 170         uint8_t *data = buf->data;
 171         memcpy( data, y, dst_wh );
 172         data += dst_wh;
 173         // U & V planes are 1/4 the size of Y plane.
 174         dst_wh >>= 2;
 175         memcpy( data, u, dst_wh );
 176         data += dst_wh;
 177         memcpy( data, v, dst_wh );
 178     }
 179     return buf;
 180 }
 181
 182 /**********************************************************************
 183  * hb_libmpeg2_decode
 184  **********************************************************************
 185  *
 186  *********************************************************************/
 187 static int hb_libmpeg2_decode( hb_libmpeg2_t * m, hb_buffer_t * buf_es,
 188                                hb_list_t * list_raw )
 189 {
 190     mpeg2_state_t   state;
 191     hb_buffer_t   * buf;
 192
 193     if ( buf_es->size )
 194     {
 195         /* Feed libmpeg2 */
 196         if( buf_es->start > -1 )
 197         {
 198             mpeg2_tag_picture( m->libmpeg2, buf_es->start >> 32,
 199                                buf_es->start & 0xFFFFFFFF );
 200         }
 201         mpeg2_buffer( m->libmpeg2, buf_es->data,
 202                       buf_es->data + buf_es->size );
 203     }
 204
 205     for( ;; )
 206     {
 207         state = mpeg2_parse( m->libmpeg2 );
 208         if( state == STATE_BUFFER )
 209         {
 210             /* Require some more data */
 211             break;
 212         }
 213         else if( state == STATE_SEQUENCE )
 214         {
 215             if( !( m->width && m->height && m->rate ) )
 216             {
 217                 m->width  = m->info->sequence->width;
 218                 m->height = m->info->sequence->height;
 219                 m->rate   = m->info->sequence->frame_period;
 220                 if ( m->aspect_ratio <= 0 && m->height &&
 221                      m->info->sequence->pixel_height )
 222                 {
 223                     /* mpeg2_parse doesn't store the aspect ratio. Instead
 224                      * it keeps the pixel width & height that would cause
 225                      * the storage width & height to come out in the correct
 226                      * aspect ratio. Convert these back to aspect ratio.
 227                      */
 228                     double ar_numer = m->width * m->info->sequence->pixel_width;
 229                     double ar_denom = m->height * m->info->sequence->pixel_height;
 230                     m->aspect_ratio = ar_numer / ar_denom;
 231                 }
 232             }
 233         }
 234         else if( state == STATE_GOP && m->look_for_break)
 235         {
 236             // we were looking for a gop to add a chapter break - we found it
 237             // so now start looking for an iframe.
 238             m->look_for_iframe = m->look_for_break;
 239             m->look_for_break = 0;
 240         }
 241         else if( ( state == STATE_SLICE || state == STATE_END ) &&
 242                  m->info->display_fbuf )
 243         {
 244             if( ( m->info->display_picture->flags &
 245                   PIC_MASK_CODING_TYPE ) == PIC_FLAG_CODING_TYPE_I )
 246             {
 247                 // we got an iframe so we can start decoding video now
 248                 m->got_iframe = 1;
 249             }
 250
 251             if( m->got_iframe )
 252             {
 253                 buf  = hb_copy_frame( m->job, m->info->sequence->width,
 254                                       m->info->sequence->height,
 255                                       m->info->display_fbuf->buf[0],
 256                                       m->info->display_fbuf->buf[1],
 257                                       m->info->display_fbuf->buf[2] );
 258                 buf->sequence = buf_es->sequence;
 259
 260                 if( m->info->display_picture->flags & PIC_FLAG_TAGS )
 261                 {
 262                     buf->start =
 263                         ( (uint64_t) m->info->display_picture->tag << 32 ) |
 264                         ( (uint64_t) m->info->display_picture->tag2 );
 265                 }
 266                 else if( m->last_pts > -1 )
 267                 {
 268                     /* For some reason nb_fields is sometimes 1 while it
 269                        should be 2 */
 270                     buf->start = m->last_pts +
 271                         MAX( 2, m->info->display_picture->nb_fields ) *
 272                         m->info->sequence->frame_period / 600;
 273                 }
 274                 else
 275                 {
 276                     buf->start = -1;
 277                 }
 278                 m->last_pts = buf->start;
 279
 280                 if( m->look_for_iframe && ( m->info->display_picture->flags &
 281                       PIC_MASK_CODING_TYPE ) == PIC_FLAG_CODING_TYPE_I )
 282                 {
 283                     // we were waiting for an iframe to insert a chapter mark
 284                     // and we have one.
 285                     buf->new_chap = m->look_for_iframe;
 286                     m->look_for_iframe = 0;
 287                     const char *chap_name = "";
 288                     if ( m->job && buf->new_chap > 0 &&
 289                          hb_list_item( m->job->title->list_chapter,
 290                                        buf->new_chap - 1 ) )
 291                     {
 292                         hb_chapter_t * c = hb_list_item( m->job->title->list_chapter,
 293                                                          buf->new_chap - 1 );
 294                         chap_name = c->title;
 295                     }
 296                     hb_log( "mpeg2: \"%s\" (%d) at frame %u time %lld",
 297                             chap_name, buf->new_chap, m->nframes, buf->start );
 298                 } else if ( m->nframes == 0 && m->job &&
 299                             hb_list_item( m->job->title->list_chapter,
 300                                           m->job->chapter_start - 1 ) )
 301                 {
 302                     hb_chapter_t * c = hb_list_item( m->job->title->list_chapter,
 303                                                      m->job->chapter_start - 1 );
 304                     hb_log( "mpeg2: \"%s\" (%d) at frame %u time %lld", c->title,
 305                             m->job->chapter_start, m->nframes, buf->start );
 306                 }
 307                 ++m->nframes;
 308
 309                 m->flag = m->info->display_picture->flags;
 310
 311 /*  Uncomment this block to see frame-by-frame picture flags, as the video encodes.
 312                hb_log("***** MPEG 2 Picture Info for PTS %lld *****", buf->start);
 313                 if( m->flag & TOP_FIRST )
 314                     hb_log("MPEG2 Flag: Top field first");
 315                 if( m->flag & PROGRESSIVE )
 316                     hb_log("MPEG2 Flag: Progressive");
 317                 if( m->flag & COMPOSITE )
 318                     hb_log("MPEG2 Flag: Composite");
 319                 if( m->flag & SKIP )
 320                     hb_log("MPEG2 Flag: Skip!");
 321                 if( m->flag & TAGS )
 322                     hb_log("MPEG2 Flag: TAGS");
 323                 if(fm->lag & REPEAT_FIRST )
 324                     hb_log("MPEG2 Flag: Repeat first field");
 325                 if( m->flag & COMPOSITE_MASK )
 326                     hb_log("MPEG2 Flag: Composite mask");
 327                 hb_log("fields: %d", m->info->display_picture->nb_fields);
 328 */
 329                 /*  Rotate the cadence tracking. */
 330                 int i = 0;
 331                 for(i=11; i > 0; i--)
 332                 {
 333                     m->cadence[i] = m->cadence[i-1];
 334                 }
 335
 336                 if ( !(m->flag & PROGRESSIVE) && !(m->flag & TOP_FIRST) )
 337                 {
 338                     /* Not progressive, not top first...
 339                        That means it's probably bottom
 340                        first, 2 fields displayed.
 341                     */
 342                     //hb_log("MPEG2 Flag: Bottom field first, 2 fields displayed.");
 343                     m->cadence[0] = BT;
 344                 }
 345                 else if ( !(m->flag & PROGRESSIVE) && (m->flag & TOP_FIRST) )
 346                 {
 347                     /* Not progressive, top is first,
 348                        Two fields displayed.
 349                     */
 350                     //hb_log("MPEG2 Flag: Top field first, 2 fields displayed.");
 351                     m->cadence[0] = TB;
 352                 }
 353                 else if ( (m->flag & PROGRESSIVE) && !(m->flag & TOP_FIRST) && !( m->flag & REPEAT_FIRST )  )
 354                 {
 355                     /* Progressive, but noting else.
 356                        That means Bottom first,
 357                        2 fields displayed.
 358                     */
 359                     //hb_log("MPEG2 Flag: Progressive. Bottom field first, 2 fields displayed.");
 360                     m->cadence[0] = BT_PROG;
 361                 }
 362                 else if ( (m->flag & PROGRESSIVE) && !(m->flag & TOP_FIRST) && ( m->flag & REPEAT_FIRST )  )
 363                 {
 364                     /* Progressive, and repeat. .
 365                        That means Bottom first,
 366                        3 fields displayed.
 367                     */
 368                     //hb_log("MPEG2 Flag: Progressive repeat. Bottom field first, 3 fields displayed.");
 369                     m->cadence[0] = BTB_PROG;
 370                 }
 371                 else if ( (m->flag & PROGRESSIVE) && (m->flag & TOP_FIRST) && !( m->flag & REPEAT_FIRST )  )
 372                 {
 373                     /* Progressive, top first.
 374                        That means top first,
 375                        2 fields displayed.
 376                     */
 377                     //hb_log("MPEG2 Flag: Progressive. Top field first, 2 fields displayed.");
 378                     m->cadence[0] = TB_PROG;
 379                 }
 380                 else if ( (m->flag & PROGRESSIVE) && (m->flag & TOP_FIRST) && ( m->flag & REPEAT_FIRST )  )
 381                 {
 382                     /* Progressive, top, repeat.
 383                        That means top first,
 384                        3 fields displayed.
 385                     */
 386                     //hb_log("MPEG2 Flag: Progressive repeat. Top field first, 3 fields displayed.");
 387                     m->cadence[0] = TBT_PROG;
 388                 }
 389
 390                 if ( (m->cadence[2] <= TB) && (m->cadence[1] <= TB) && (m->cadence[0] > TB) && (m->cadence[11]) )
 391                     hb_log("%fs: Video -> Film", (float)buf->start / 90000);
 392                 if ( (m->cadence[2] > TB) && (m->cadence[1] <= TB) && (m->cadence[0] <= TB) && (m->cadence[11]) )
 393                     hb_log("%fs: Film -> Video", (float)buf->start / 90000);
 394
 395                 /* Store picture flags for later use by filters */
 396                 buf->flags = m->info->display_picture->flags;
 397
 398                 hb_list_add( list_raw, buf );
 399             }
 400         }
 401         else if( state == STATE_INVALID )
 402         {
 403             mpeg2_reset( m->libmpeg2, 0 );
 404         }
 405
 406         /*
 407          * Look for Closed Captions if scanning (!job) or if closed captions have been requested.
 408          *
 409          * Send them on to the closed caption decoder if requested and found.
 410          */
 411         if( ( !m->job || m->subtitle) &&
 412             ( m->info->user_data_len != 0 &&
 413               m->info->user_data[0] == 0x43 &&
 414               m->info->user_data[1] == 0x43 ) )
 415         {
 416             int i, j;
 417             const uint8_t *header = &m->info->user_data[4];
 418             uint8_t pattern=header[0] & 0x80;
 419             int field1packet = 0; /* expect Field 1 first */
 420             if (pattern==0x00)
 421                 field1packet=1; /* expect Field 1 second */
 422             int capcount=(header[0] & 0x1e) / 2;
 423             header++;
 424
 425             /*
 426              * Add closed captions to the title if we are scanning (no job).
 427              *
 428              * Just because we don't add this doesn't mean that there aren't any when
 429              * we scan, just that noone said anything. So you should be able to add
 430              * closed captions some other way (See decmpeg2Init() for alternative
 431              * approach of assuming that there are always CC, which is probably
 432              * safer - however I want to leave the autodetect in here for now to
 433              * see how it goes).
 434              */
 435             if( !m->job && m->title )
 436             {
 437                 hb_subtitle_t * subtitle;
 438                 int found = 0;
 439                 int i;
 440
 441                 for( i = 0; i < hb_list_count( m->title->list_subtitle ); i++ )
 442                 {
 443                     subtitle = hb_list_item( m->title->list_subtitle, i);
 444                     /*
 445                      * Let's call them 608 subs for now even if they aren't, since they
 446                      * are the only types we grok.
 447                      */
 448                     if( subtitle && subtitle->source == CC608SUB )
 449                     {
 450                         found = 1;
 451                         break;
 452                     }
 453                 }
 454
 455                 if( !found )
 456                 {
 457                     subtitle = calloc( sizeof( hb_subtitle_t ), 1 );
 458                     subtitle->track = 0;
 459                     subtitle->id = 0x0;
 460                     snprintf( subtitle->lang, sizeof( subtitle->lang ), "Closed Captions");
 461                     snprintf( subtitle->iso639_2, sizeof( subtitle->iso639_2 ), "und");
 462                     subtitle->format = TEXTSUB;
 463                     subtitle->source = CC608SUB;
 464                     subtitle->dest   = PASSTHRUSUB;
 465                     subtitle->type = 5;
 466
 467                     hb_list_add( m->title->list_subtitle, subtitle );
 468                 }
 469             }
 470
 471             for( i=0; i<capcount; i++ )
 472             {
 473                 for( j=0; j<2; j++ )
 474                 {
 475                     uint8_t data[3];
 476                     data[0] = header[0];
 477                     data[1] = header[1];
 478                     data[2] = header[2];
 479                     header += 3;
 480                     /* Field 1 and 2 data can be in either order,
 481                        with marker bytes of \xff and \xfe
 482                        Since markers can be repeated, use pattern as well */
 483                     if( data[0] == 0xff && j == field1packet )
 484                     {
 485                         data[0] = 0x04; // Field 1
 486                     }
 487                     else
 488                     {
 489                         data[0] = 0x05; // Field 2
 490                     }
 491                     hb_mpeg2_cc( m, data );
 492                 }
 493             }
 494             // Deal with extra closed captions some DVD have.
 495             while( header[0]==0xfe || header[0]==0xff )
 496             {
 497                 for( j=0; j<2; j++ )
 498                 {
 499                     uint8_t data[3];
 500                     data[0] = header[0];
 501                     data[1] = header[1];
 502                     data[2] = header[2];
 503                     header += 3;
 504                     /* Field 1 and 2 data can be in either order,
 505                        with marker bytes of \xff and \xfe
 506                        Since markers can be repeated, use pattern as well */
 507                     if( data[0] == 0xff && j == field1packet )
 508                     {
 509                         data[0] = 0x04; // Field 1
 510                     }
 511                     else
 512                     {
 513                         data[0] = 0x05; // Field 2
 514                     }
 515                     hb_mpeg2_cc( m, data );
 516                 }
 517             }
 518         }
 519     }
 520     return 1;
 521 }
 522
 523 /**********************************************************************
 524  * hb_libmpeg2_close
 525  **********************************************************************
 526  *
 527  *********************************************************************/
 528 static void hb_libmpeg2_close( hb_libmpeg2_t ** _m )
 529 {
 530     hb_libmpeg2_t * m = *_m;
 531
 532     mpeg2_close( m->libmpeg2 );
 533
 534     free( m );
 535     *_m = NULL;
 536 }
 537
 538 /**********************************************************************
 539  * The decmpeg2 work object
 540  **********************************************************************
 541  *
 542  *********************************************************************/
 543 struct hb_work_private_s
 544 {
 545     hb_libmpeg2_t * libmpeg2;
 546     hb_list_t     * list;
 547 };
 548
 549 /**********************************************************************
 550  * hb_work_decmpeg2_init
 551  **********************************************************************
 552  *
 553  *********************************************************************/
 554 static int decmpeg2Init( hb_work_object_t * w, hb_job_t * job )
 555 {
 556     hb_work_private_t * pv;
 557
 558     pv              = calloc( 1, sizeof( hb_work_private_t ) );
 559     w->private_data = pv;
 560
 561     pv->libmpeg2 = hb_libmpeg2_init();
 562     pv->list     = hb_list_init();
 563
 564     pv->libmpeg2->job = job;
 565
 566     if( job && job->title ) {
 567         pv->libmpeg2->title = job->title;
 568     }
 569
 570     /*
 571      * If not scanning, then are we supposed to extract Closed Captions
 572      * and send them to the decoder?
 573      */
 574     if( job )
 575     {
 576         hb_subtitle_t * subtitle;
 577         int i;
 578
 579         for( i = 0; i < hb_list_count( job->list_subtitle ); i++ )
 580         {
 581             subtitle = hb_list_item( job->list_subtitle, i);
 582             if( subtitle && subtitle->source == CC608SUB )
 583             {
 584                 pv->libmpeg2->subtitle = subtitle;
 585                 break;
 586             }
 587         }
 588
 589     }
 590
 591     return 0;
 592 }
 593
 594 /**********************************************************************
 595  * Work
 596  **********************************************************************
 597  *
 598  *********************************************************************/
 599 static int decmpeg2Work( hb_work_object_t * w, hb_buffer_t ** buf_in,
 600                          hb_buffer_t ** buf_out )
 601 {
 602     hb_work_private_t * pv = w->private_data;
 603     hb_buffer_t * buf, * last = NULL;
 604     int status = HB_WORK_OK;
 605
 606     if( w->title && pv && pv->libmpeg2 && !pv->libmpeg2->title ) {
 607         pv->libmpeg2->title = w->title;
 608     }
 609
 610     // The reader found a chapter break, consume it completely, and remove it from the
 611     // stream. We need to shift it.
 612     if( (*buf_in)->new_chap )
 613     {
 614         pv->libmpeg2->look_for_break = (*buf_in)->new_chap;
 615         (*buf_in)->new_chap = 0;
 616     }
 617
 618     hb_libmpeg2_decode( pv->libmpeg2, *buf_in, pv->list );
 619
 620     /* if we got an empty buffer signaling end-of-stream send it downstream */
 621     if ( (*buf_in)->size == 0 )
 622     {
 623         hb_list_add( pv->list, *buf_in );
 624         *buf_in = NULL;
 625         status = HB_WORK_DONE;
 626         /*
 627          * Let the Closed Captions know that it is the end of the data.
 628          */
 629         if( pv->libmpeg2->subtitle )
 630         {
 631             hb_buffer_t *buf_eof = hb_buffer_init( 0 );
 632
 633             if( buf_eof )
 634             {
 635                 hb_fifo_push( pv->libmpeg2->subtitle->fifo_in, buf_eof );
 636             }
 637         }
 638     }
 639
 640     *buf_out = NULL;
 641     while( ( buf = hb_list_item( pv->list, 0 ) ) )
 642     {
 643         hb_list_rem( pv->list, buf );
 644         if( last )
 645         {
 646             last->next = buf;
 647             last       = buf;
 648         }
 649         else
 650         {
 651             *buf_out = buf;
 652             last     = buf;
 653         }
 654     }
 655
 656     return status;
 657 }
 658
 659 /**********************************************************************
 660  * Close
 661  **********************************************************************
 662  *
 663  *********************************************************************/
 664 static void decmpeg2Close( hb_work_object_t * w )
 665 {
 666     hb_work_private_t * pv = w->private_data;
 667
 668     // don't log during scan
 669     if ( pv->libmpeg2->job )
 670     {
 671         hb_log( "mpeg2 done: %d frames", pv->libmpeg2->nframes );
 672     }
 673     hb_list_close( &pv->list );
 674     hb_libmpeg2_close( &pv->libmpeg2 );
 675     free( pv );
 676 }
 677
 678 static int decmpeg2Info( hb_work_object_t *w, hb_work_info_t *info )
 679 {
 680     hb_work_private_t *pv = w->private_data;
 681
 682     memset( info, 0, sizeof(*info) );
 683
 684     if ( pv && pv->libmpeg2 && pv->libmpeg2->info && pv->libmpeg2->info->sequence )
 685     {
 686         hb_libmpeg2_t *m = pv->libmpeg2;
 687
 688         info->width = m->width;
 689         info->height = m->height;
 690         info->pixel_aspect_width = m->info->sequence->pixel_width;
 691         info->pixel_aspect_height = m->info->sequence->pixel_height;
 692         info->aspect = m->aspect_ratio;
 693
 694         // if the frame is progressive & NTSC DVD height report it as 23.976 FPS
 695         // so that scan can autodetect NTSC film
 696         info->rate = 27000000;
 697         info->rate_base = ( m->info->display_fbuf && m->info->display_picture &&
 698                             (m->info->display_picture->flags & PROGRESSIVE) &&
 699                             (m->height == 480 ) ) ?  1126125 : m->rate;
 700
 701         info->bitrate = m->info->sequence->byte_rate * 8;
 702         info->profile = m->info->sequence->profile_level_id >> 4;
 703         info->level = m->info->sequence->profile_level_id & 0xf;
 704         info->name = "mpeg2";
 705         return 1;
 706     }
 707     return 0;
 708 }
 709
 710 hb_work_object_t hb_decmpeg2 =
 711 {
 712     WORK_DECMPEG2,
 713     "MPEG-2 decoder (libmpeg2)",
 714     decmpeg2Init,
 715     decmpeg2Work,
 716     decmpeg2Close,
 717     decmpeg2Info
 718 };
 719