git.sesse.net Git - vlc/blob - modules/packetizer/vc1.c

   1 /*****************************************************************************
   2  * vc1.c
   3  *****************************************************************************
   4  * Copyright (C) 2001, 2002, 2006 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   8  *          Gildas Bazin <gbazin@videolan.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28
  29 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32
  33 #include <vlc_common.h>
  34 #include <vlc_plugin.h>
  35 #include <vlc_codec.h>
  36 #include <vlc_block.h>
  37
  38 #include "vlc_bits.h"
  39 #include "vlc_block_helper.h"
  40
  41 /*****************************************************************************
  42  * Module descriptor
  43  *****************************************************************************/
  44 static int  Open ( vlc_object_t * );
  45 static void Close( vlc_object_t * );
  46
  47 vlc_module_begin ()
  48     set_category( CAT_SOUT )
  49     set_subcategory( SUBCAT_SOUT_PACKETIZER )
  50     set_description( N_("VC-1 packetizer") )
  51     set_capability( "packetizer", 50 )
  52     set_callbacks( Open, Close )
  53 vlc_module_end ()
  54
  55 /*****************************************************************************
  56  * Local prototypes
  57  *****************************************************************************/
  58 struct decoder_sys_t
  59 {
  60     /*
  61      * Input properties
  62      */
  63     block_bytestream_t bytestream;
  64     int i_state;
  65     size_t i_offset;
  66     uint8_t p_startcode[3];
  67
  68     /* Current sequence header */
  69     bool b_sequence_header;
  70     struct
  71     {
  72         block_t *p_sh;
  73         bool b_advanced_profile;
  74         bool b_interlaced;
  75         bool b_frame_interpolation;
  76         bool b_range_reduction;
  77         bool b_has_bframe;
  78     } sh;
  79     bool b_entry_point;
  80     struct
  81     {
  82         block_t *p_ep;
  83     } ep;
  84
  85     /* */
  86     bool  b_frame;
  87
  88     /* Current frame being built */
  89     block_t    *p_frame;
  90     block_t    **pp_last;
  91
  92
  93     mtime_t i_interpolated_dts;
  94 };
  95
  96 enum
  97 {
  98     STATE_NOSYNC,
  99     STATE_NEXT_SYNC
 100 };
 101
 102 typedef enum
 103 {
 104     IDU_TYPE_SEQUENCE_HEADER = 0x0f,
 105     IDU_TYPE_ENTRY_POINT = 0x0e,
 106     IDU_TYPE_FRAME = 0x0D,
 107     IDU_TYPE_FIELD = 0x0C,
 108     IDU_TYPE_SLICE = 0x0B,
 109     IDU_TYPE_END_OF_SEQUENCE = 0x0A,
 110
 111     IDU_TYPE_SEQUENCE_LEVEL_USER_DATA = 0x1F,
 112     IDU_TYPE_ENTRY_POINT_USER_DATA = 0x1E,
 113     IDU_TYPE_FRAME_USER_DATA = 0x1D,
 114     IDU_TYPE_FIELD_USER_DATA = 0x1C,
 115     IDU_TYPE_SLICE_USER_DATA = 0x1B,
 116 } idu_type_t;
 117
 118 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block );
 119
 120 /*****************************************************************************
 121  * Open: probe the packetizer and return score
 122  *****************************************************************************
 123  * Tries to launch a decoder and return score so that the interface is able
 124  * to choose.
 125  *****************************************************************************/
 126 static int Open( vlc_object_t *p_this )
 127 {
 128     decoder_t     *p_dec = (decoder_t*)p_this;
 129     decoder_sys_t *p_sys;
 130
 131     if( p_dec->fmt_in.i_codec !=  VLC_FOURCC( 'W', 'V', 'C', '1' ) )
 132         return VLC_EGENERIC;
 133
 134     p_dec->pf_packetize = Packetize;
 135
 136     /* Create the output format */
 137     es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
 138     p_dec->p_sys = p_sys = malloc( sizeof( decoder_sys_t ) );
 139
 140     p_sys->i_state = STATE_NOSYNC;
 141     p_sys->bytestream = block_BytestreamInit();
 142     p_sys->p_startcode[0] = 0x00;
 143     p_sys->p_startcode[1] = 0x00;
 144     p_sys->p_startcode[2] = 0x01;
 145     p_sys->i_offset = 0;
 146
 147     p_sys->b_sequence_header = false;
 148     p_sys->sh.p_sh = NULL;
 149     p_sys->b_entry_point = false;
 150     p_sys->ep.p_ep = NULL;
 151
 152     p_sys->b_frame = false;
 153     p_sys->p_frame = NULL;
 154     p_sys->pp_last = &p_sys->p_frame;
 155
 156     p_sys->i_interpolated_dts = -1;
 157
 158
 159     if( p_dec->fmt_in.i_extra > 0 )
 160     {
 161         block_t *p_init = block_New( p_dec, p_dec->fmt_in.i_extra );
 162         block_t *p_pic;
 163
 164         memcpy( p_init->p_buffer, p_dec->fmt_in.p_extra,
 165                 p_dec->fmt_in.i_extra );
 166
 167         while( ( p_pic = Packetize( p_dec, &p_init ) ) )
 168             block_Release( p_pic ); /* Should not happen (only sequence header) */
 169     }
 170
 171     return VLC_SUCCESS;
 172 }
 173
 174 /*****************************************************************************
 175  * Close:
 176  *****************************************************************************/
 177 static void Close( vlc_object_t *p_this )
 178 {
 179     decoder_t     *p_dec = (decoder_t*)p_this;
 180     decoder_sys_t *p_sys = p_dec->p_sys;
 181
 182     block_BytestreamRelease( &p_sys->bytestream );
 183     if( p_sys->p_frame )
 184         block_Release( p_sys->p_frame );
 185     free( p_sys );
 186 }
 187
 188 /*****************************************************************************
 189  * Packetize: packetize an access unit
 190  *****************************************************************************/
 191 static block_t *ParseIDU( decoder_t *p_dec, bool *pb_used_ts, block_t *p_frag );
 192
 193 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
 194 {
 195     decoder_sys_t *p_sys = p_dec->p_sys;
 196     block_t       *p_pic;
 197
 198     if( pp_block == NULL || *pp_block == NULL )
 199         return NULL;
 200
 201     if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
 202     {
 203         if( (*pp_block)->i_flags&BLOCK_FLAG_CORRUPTED )
 204         {
 205             p_sys->i_state = STATE_NOSYNC;
 206             block_BytestreamEmpty( &p_sys->bytestream );
 207
 208             if( p_sys->p_frame )
 209                 block_ChainRelease( p_sys->p_frame );
 210             p_sys->p_frame = NULL;
 211             p_sys->pp_last = &p_sys->p_frame;
 212             p_sys->b_frame = false;
 213         }
 214         p_sys->i_interpolated_dts = 0;
 215         block_Release( *pp_block );
 216         return NULL;
 217     }
 218
 219     block_BytestreamPush( &p_sys->bytestream, *pp_block );
 220
 221     for( ;; )
 222     {
 223         bool b_used_ts;
 224
 225         switch( p_sys->i_state )
 226         {
 227
 228         case STATE_NOSYNC:
 229             if( block_FindStartcodeFromOffset( &p_sys->bytestream, &p_sys->i_offset, p_sys->p_startcode, 3 ) == VLC_SUCCESS )
 230                 p_sys->i_state = STATE_NEXT_SYNC;
 231
 232             if( p_sys->i_offset )
 233             {
 234                 block_SkipBytes( &p_sys->bytestream, p_sys->i_offset );
 235                 p_sys->i_offset = 0;
 236                 block_BytestreamFlush( &p_sys->bytestream );
 237             }
 238
 239             if( p_sys->i_state != STATE_NEXT_SYNC )
 240                 return NULL; /* Need more data */
 241
 242             p_sys->i_offset = 4; /* To find next startcode */
 243
 244         case STATE_NEXT_SYNC:
 245             /* TODO: If p_block == NULL, flush the buffer without checking the
 246              * next sync word */
 247
 248             /* Find the next startcode */
 249             if( block_FindStartcodeFromOffset( &p_sys->bytestream, &p_sys->i_offset, p_sys->p_startcode, 3 ) != VLC_SUCCESS )
 250                 return NULL; /* Need more data */
 251
 252             /* Get the new fragment and set the pts/dts */
 253             p_pic = block_New( p_dec, p_sys->i_offset );
 254             block_BytestreamFlush( &p_sys->bytestream );
 255             p_pic->i_pts = p_sys->bytestream.p_block->i_pts;
 256             p_pic->i_dts = p_sys->bytestream.p_block->i_dts;
 257
 258             block_GetBytes( &p_sys->bytestream, p_pic->p_buffer, p_pic->i_buffer );
 259
 260             p_sys->i_offset = 0;
 261
 262             /* Parse and return complete frame */
 263             p_pic = ParseIDU( p_dec, &b_used_ts, p_pic );
 264
 265             /* Don't reuse the same timestamps several times */
 266             if( b_used_ts )
 267             {
 268                 p_sys->bytestream.p_block->i_pts = -1;
 269                 p_sys->bytestream.p_block->i_dts = -1;
 270             }
 271
 272             /* */
 273             if( !p_pic )
 274             {
 275                 p_sys->i_state = STATE_NOSYNC;
 276                 break;
 277             }
 278             /* */
 279             if( p_sys->i_interpolated_dts < 0 )
 280             {
 281                 msg_Dbg( p_dec, "need a starting pts/dts" );
 282                 p_sys->i_state = STATE_NOSYNC;
 283                 block_Release( p_pic );
 284                 break;
 285             }
 286
 287             /* So p_block doesn't get re-added several times */
 288             *pp_block = block_BytestreamPop( &p_sys->bytestream );
 289
 290             p_sys->i_state = STATE_NOSYNC;
 291
 292             return p_pic;
 293         }
 294     }
 295 }
 296
 297 /* DecodeRIDU: decode the startcode emulation prevention (same than h264) */
 298 static void DecodeRIDU( uint8_t *p_ret, int *pi_ret, uint8_t *src, int i_src )
 299 {
 300     uint8_t *end = &src[i_src];
 301     uint8_t *dst_end = &p_ret[*pi_ret];
 302     uint8_t *dst = p_ret;
 303
 304     while( src < end && dst < dst_end )
 305     {
 306         if( src < end - 3 && src[0] == 0x00 && src[1] == 0x00 &&
 307             src[2] == 0x03 )
 308         {
 309             *dst++ = 0x00;
 310             *dst++ = 0x00;
 311
 312             src += 3;
 313             continue;
 314         }
 315         *dst++ = *src++;
 316     }
 317
 318     *pi_ret = dst - p_ret;
 319 }
 320 /* BuildExtraData: gather sequence header and entry point */
 321 static void BuildExtraData( decoder_t *p_dec )
 322 {
 323     decoder_sys_t *p_sys = p_dec->p_sys;
 324     es_format_t *p_es = &p_dec->fmt_out;
 325     int i_extra;
 326     if( !p_sys->b_sequence_header || !p_sys->b_entry_point )
 327         return;
 328
 329     i_extra = p_sys->sh.p_sh->i_buffer + p_sys->ep.p_ep->i_buffer;
 330     if( p_es->i_extra != i_extra )
 331     {
 332         p_es->i_extra = i_extra;
 333         p_es->p_extra = realloc( p_dec->fmt_out.p_extra, p_es->i_extra );
 334     }
 335     memcpy( p_es->p_extra,
 336             p_sys->sh.p_sh->p_buffer, p_sys->sh.p_sh->i_buffer );
 337     memcpy( (uint8_t*)p_es->p_extra + p_sys->sh.p_sh->i_buffer,
 338             p_sys->ep.p_ep->p_buffer, p_sys->ep.p_ep->i_buffer );
 339 }
 340 /* ParseIDU: parse an Independent Decoding Unit */
 341 static block_t *ParseIDU( decoder_t *p_dec, bool *pb_used_ts, block_t *p_frag )
 342 {
 343     decoder_sys_t *p_sys = p_dec->p_sys;
 344     block_t *p_pic;
 345     const idu_type_t idu = p_frag->p_buffer[3];
 346
 347     *pb_used_ts = false;
 348     if( !p_sys->b_sequence_header && idu != IDU_TYPE_SEQUENCE_HEADER )
 349     {
 350         msg_Warn( p_dec, "waiting for sequence header" );
 351         block_Release( p_frag );
 352         return NULL;
 353     }
 354     if( p_sys->b_sequence_header && !p_sys->b_entry_point && idu != IDU_TYPE_ENTRY_POINT )
 355     {
 356         msg_Warn( p_dec, "waiting for entry point" );
 357         block_Release( p_frag );
 358         return NULL;
 359     }
 360     /* TODO we do not gather ENTRY_POINT and SEQUENCE_DATA user data
 361      * But It should not be a problem for decoder */
 362
 363     /* Do we have completed a frame */
 364     p_pic = NULL;
 365     if( p_sys->b_frame &&
 366         idu != IDU_TYPE_FRAME_USER_DATA &&
 367         idu != IDU_TYPE_FIELD && idu != IDU_TYPE_FIELD_USER_DATA &&
 368         idu != IDU_TYPE_SLICE && idu != IDU_TYPE_SLICE_USER_DATA &&
 369         idu != IDU_TYPE_END_OF_SEQUENCE )
 370     {
 371         /* */
 372         p_pic = block_ChainGather( p_sys->p_frame );
 373
 374         /* */
 375         if( p_pic->i_dts > 0 )
 376             p_sys->i_interpolated_dts = p_pic->i_dts;
 377
 378         /* We can interpolate dts/pts only if we have a frame rate */
 379         if( p_dec->fmt_out.video.i_frame_rate != 0 && p_dec->fmt_out.video.i_frame_rate_base != 0 )
 380         {
 381             if( p_sys->i_interpolated_dts > 0 )
 382                 p_sys->i_interpolated_dts += INT64_C(1000000) *
 383                                              p_dec->fmt_out.video.i_frame_rate_base /
 384                                              p_dec->fmt_out.video.i_frame_rate;
 385
 386             //msg_Dbg( p_dec, "-------------- XXX0 dts=%"PRId64" pts=%"PRId64" interpolated=%"PRId64,
 387             //         p_pic->i_dts, p_pic->i_pts, p_sys->i_interpolated_dts );
 388             if( p_pic->i_dts <= 0 )
 389                 p_pic->i_dts = p_sys->i_interpolated_dts;
 390
 391             if( p_pic->i_pts <= 0 )
 392             {
 393                 if( !p_sys->sh.b_has_bframe || (p_pic->i_flags & BLOCK_FLAG_TYPE_B ) )
 394                     p_pic->i_pts = p_pic->i_dts;
 395                 /* TODO compute pts for other case */
 396             }
 397         }
 398
 399         //msg_Dbg( p_dec, "-------------- dts=%"PRId64" pts=%"PRId64, p_pic->i_dts, p_pic->i_pts );
 400
 401         /* Reset context */
 402         p_sys->b_frame = false;
 403         p_sys->p_frame = NULL;
 404         p_sys->pp_last = &p_sys->p_frame;
 405     }
 406
 407     /*  */
 408     if( p_sys->p_frame )
 409     {
 410         block_t *p_frame = p_sys->p_frame;
 411         if( p_frame->i_dts <= 0 && p_frame->i_pts <= 0 )
 412         {
 413             p_frame->i_dts = p_frag->i_dts;
 414             p_frame->i_pts = p_frag->i_pts;
 415             *pb_used_ts = true;
 416         }
 417     }
 418     block_ChainLastAppend( &p_sys->pp_last, p_frag );
 419
 420     /* Parse IDU */
 421     if( idu == IDU_TYPE_SEQUENCE_HEADER )
 422     {
 423         es_format_t *p_es = &p_dec->fmt_out;
 424         bs_t s;
 425         int i_profile;
 426         uint8_t ridu[32];
 427         int     i_ridu = sizeof(ridu);
 428
 429         /* */
 430         if( p_sys->sh.p_sh )
 431             block_Release( p_sys->sh.p_sh );
 432         p_sys->sh.p_sh = block_Duplicate( p_frag );
 433
 434         /* Extract the raw IDU */
 435         DecodeRIDU( ridu, &i_ridu, &p_frag->p_buffer[4], p_frag->i_buffer - 4 );
 436
 437         /* Auto detect VC-1_SPMP_PESpacket_PayloadFormatHeader (SMPTE RP 227) for simple/main profile
 438          * TODO find a test case and valid it */
 439         if( i_ridu > 4 && (ridu[0]&0x80) == 0 ) /* for advanced profile, the first bit is 1 */
 440         {
 441             video_format_t *p_v = &p_dec->fmt_in.video;
 442             const size_t i_potential_width  = GetWBE( &ridu[0] );
 443             const size_t i_potential_height = GetWBE( &ridu[2] );
 444
 445             if( i_potential_width >= 2  && i_potential_width <= 8192 &&
 446                 i_potential_height >= 2 && i_potential_height <= 8192 )
 447             {
 448                 if( ( p_v->i_width <= 0 && p_v->i_height <= 0  ) ||
 449                     ( p_v->i_width  == i_potential_width &&  p_v->i_height == i_potential_height ) )
 450                 {
 451                     static const uint8_t startcode[4] = { 0x00, 0x00, 0x01, IDU_TYPE_SEQUENCE_HEADER };
 452                     p_es->video.i_width  = i_potential_width;
 453                     p_es->video.i_height = i_potential_height;
 454
 455                     /* Remove it */
 456                     p_frag->p_buffer += 4;
 457                     p_frag->i_buffer -= 4;
 458                     memcpy( p_frag->p_buffer, startcode, sizeof(startcode) );
 459                 }
 460             }
 461         }
 462
 463         /* Parse it */
 464         bs_init( &s, ridu, i_ridu );
 465         i_profile = bs_read( &s, 2 );
 466         if( i_profile == 3 )
 467         {
 468             const int i_level = bs_read( &s, 3 );
 469
 470             /* Advanced profile */
 471             p_sys->sh.b_advanced_profile = true;
 472             p_sys->sh.b_range_reduction = false;
 473             p_sys->sh.b_has_bframe = true;
 474
 475             bs_skip( &s, 2+3+5+1 ); // chroma format + frame rate Q + bit rate Q + postprocflag
 476
 477             p_es->video.i_width  = 2*bs_read( &s, 12 )+2;
 478             p_es->video.i_height = 2*bs_read( &s, 12 )+2;
 479
 480             if( !p_sys->b_sequence_header )
 481                 msg_Dbg( p_dec, "found sequence header for advanced profile level L%d resolution %dx%d",
 482                          i_level, p_es->video.i_width, p_es->video.i_height);
 483
 484             bs_skip( &s, 1 );// pulldown
 485             p_sys->sh.b_interlaced = bs_read( &s, 1 );
 486             bs_skip( &s, 1 );// frame counter
 487             p_sys->sh.b_frame_interpolation = bs_read( &s, 1 );
 488             bs_skip( &s, 1 );       // Reserved
 489             bs_skip( &s, 1 );       // Psf
 490
 491             if( bs_read( &s, 1 ) )  /* Display extension */
 492             {
 493                 const int i_display_width  = bs_read( &s, 14 )+1;
 494                 const int i_display_height = bs_read( &s, 14 )+1;
 495
 496                 p_es->video.i_aspect = VOUT_ASPECT_FACTOR * i_display_width / i_display_height;
 497
 498                 if( !p_sys->b_sequence_header )
 499                     msg_Dbg( p_dec, "display size %dx%d", i_display_width, i_display_height );
 500
 501                 if( bs_read( &s, 1 ) )  /* Pixel aspect ratio (PAR/SAR) */
 502                 {
 503                     static const int p_ar[16][2] = {
 504                         { 0, 0}, { 1, 1}, {12,11}, {10,11}, {16,11}, {40,33},
 505                         {24,11}, {20,11}, {32,11}, {80,33}, {18,11}, {15,11},
 506                         {64,33}, {160,99},{ 0, 0}, { 0, 0}
 507                     };
 508                     int i_ar = bs_read( &s, 4 );
 509                     unsigned i_ar_w, i_ar_h;
 510
 511                     if( i_ar == 15 )
 512                     {
 513                         i_ar_w = bs_read( &s, 8 );
 514                         i_ar_h = bs_read( &s, 8 );
 515                     }
 516                     else
 517                     {
 518                         i_ar_w = p_ar[i_ar][0];
 519                         i_ar_h = p_ar[i_ar][1];
 520                     }
 521                     vlc_ureduce( &i_ar_w, &i_ar_h, i_ar_w, i_ar_h, 0 );
 522                     if( !p_sys->b_sequence_header )
 523                         msg_Dbg( p_dec, "aspect ratio %d:%d", i_ar_w, i_ar_h );
 524                 }
 525             }
 526             if( bs_read( &s, 1 ) )  /* Frame rate */
 527             {
 528                 int i_fps_num = 0;
 529                 int i_fps_den = 0;
 530                 if( bs_read( &s, 1 ) )
 531                 {
 532                     i_fps_num = bs_read( &s, 16 )+1;
 533                     i_fps_den = 32;
 534                 }
 535                 else
 536                 {
 537                     const int i_nr = bs_read( &s, 8 );
 538                     const int i_dn = bs_read( &s, 4 );
 539
 540                     switch( i_nr )
 541                     {
 542                     case 1: i_fps_num = 24000; break;
 543                     case 2: i_fps_num = 25000; break;
 544                     case 3: i_fps_num = 30000; break;
 545                     case 4: i_fps_num = 50000; break;
 546                     case 5: i_fps_num = 60000; break;
 547                     case 6: i_fps_num = 48000; break;
 548                     case 7: i_fps_num = 72000; break;
 549                     }
 550                     switch( i_dn )
 551                     {
 552                     case 1: i_fps_den = 1000; break;
 553                     case 2: i_fps_den = 1001; break;
 554                     }
 555                 }
 556                 if( i_fps_num != 0 && i_fps_den != 0 )
 557                     vlc_ureduce( &p_es->video.i_frame_rate, &p_es->video.i_frame_rate_base, i_fps_num, i_fps_den, 0 );
 558
 559                 if( !p_sys->b_sequence_header )
 560                     msg_Dbg( p_dec, "frame rate %d/%d", p_es->video.i_frame_rate, p_es->video.i_frame_rate_base );
 561             }
 562         }
 563         else
 564         {
 565             /* Simple and main profile */
 566             p_sys->sh.b_advanced_profile = false;
 567             p_sys->sh.b_interlaced = false;
 568
 569             if( !p_sys->b_sequence_header )
 570                 msg_Dbg( p_dec, "found sequence header for %s profile", i_profile == 0 ? "simple" : "main" );
 571
 572             bs_skip( &s, 2+3+5+1+1+     // reserved + frame rate Q + bit rate Q + loop filter + reserved
 573                          1+1+1+1+2+     // multiresolution + reserved + fast uv mc + extended mv + dquant
 574                          1+1+1+1 );     // variable size transform + reserved + overlap + sync marker
 575             p_sys->sh.b_range_reduction = bs_read( &s, 1 );
 576             if( bs_read( &s, 3 ) > 0 )
 577                 p_sys->sh.b_has_bframe = true;
 578             else
 579                 p_sys->sh.b_has_bframe = false;
 580             bs_skip( &s, 2 );           // quantizer
 581
 582             p_sys->sh.b_frame_interpolation = bs_read( &s, 1 );
 583         }
 584         p_sys->b_sequence_header = true;
 585         BuildExtraData( p_dec );
 586     }
 587     else if( idu == IDU_TYPE_ENTRY_POINT )
 588     {
 589         if( p_sys->ep.p_ep )
 590             block_Release( p_sys->ep.p_ep );
 591         p_sys->ep.p_ep = block_Duplicate( p_frag );
 592
 593         p_sys->b_entry_point = true;
 594         BuildExtraData( p_dec );
 595     }
 596     else if( idu == IDU_TYPE_FRAME )
 597     {
 598         bs_t s;
 599         uint8_t ridu[8];
 600         int     i_ridu = sizeof(ridu);
 601
 602         /* Extract the raw IDU */
 603         DecodeRIDU( ridu, &i_ridu, &p_frag->p_buffer[4], p_frag->i_buffer - 4 );
 604
 605         /* Parse it + interpolate pts/dts if possible */
 606         bs_init( &s, ridu, i_ridu );
 607
 608         if( p_sys->sh.b_advanced_profile )
 609         {
 610             int i_fcm = 0;
 611
 612             if( p_sys->sh.b_interlaced )
 613             {
 614                 if( bs_read( &s, 1 ) )
 615                 {
 616                     if( bs_read( &s, 1 ) )
 617                         i_fcm = 1;  /* interlaced field */
 618                     else
 619                         i_fcm = 2;  /* interlaced frame */
 620                 }
 621             }
 622
 623             if( i_fcm == 1 ) /*interlaced field */
 624             {
 625                 /* XXX for mixed I/P we should check reference usage before marking them I (too much work) */
 626                 switch( bs_read( &s, 3 ) )
 627                 {
 628                 case 0: /* II */
 629                 case 1: /* IP */
 630                 case 2: /* PI */
 631                     p_sys->p_frame->i_flags |= BLOCK_FLAG_TYPE_I;
 632                     p_sys->p_frame->i_flags |= BLOCK_FLAG_TYPE_I;
 633                     p_sys->p_frame->i_flags |= BLOCK_FLAG_TYPE_I;
 634                     break;
 635                 case 3: /* PP */
 636                     p_sys->p_frame->i_flags |= BLOCK_FLAG_TYPE_P;
 637                     break;
 638                 case 4: /* BB */
 639                 case 5: /* BBi */
 640                 case 6: /* BiB */
 641                 case 7: /* BiBi */
 642                     p_sys->p_frame->i_flags |= BLOCK_FLAG_TYPE_B;
 643                     break;
 644                 }
 645             }
 646             else
 647             {
 648                 if( !bs_read( &s, 1 ) )
 649                     p_sys->p_frame->i_flags |= BLOCK_FLAG_TYPE_P;
 650                 else if( !bs_read( &s, 1 ) )
 651                     p_sys->p_frame->i_flags |= BLOCK_FLAG_TYPE_B;
 652                 else if( !bs_read( &s, 1 ) )
 653                     p_sys->p_frame->i_flags |= BLOCK_FLAG_TYPE_I;
 654                 else if( !bs_read( &s, 1 ) )
 655                     p_sys->p_frame->i_flags |= BLOCK_FLAG_TYPE_B;   /* Bi */
 656                 else
 657                     p_sys->p_frame->i_flags |= BLOCK_FLAG_TYPE_P;   /* P Skip */
 658             }
 659         }
 660         else
 661         {
 662             if( p_sys->sh.b_frame_interpolation )
 663                 bs_skip( &s, 1 );   // interpolate
 664             bs_skip( &s, 2 );       // frame count
 665             if( p_sys->sh.b_range_reduction )
 666                 bs_skip( &s, 1 );   // range reduction
 667
 668             if( bs_read( &s, 1 ) )
 669                 p_sys->p_frame->i_flags |= BLOCK_FLAG_TYPE_P;
 670             else if( !p_sys->sh.b_has_bframe || bs_read( &s, 1 ) )
 671                 p_sys->p_frame->i_flags |= BLOCK_FLAG_TYPE_I;
 672             else
 673                 p_sys->p_frame->i_flags |= BLOCK_FLAG_TYPE_B;
 674         }
 675         p_sys->b_frame = true;
 676     }
 677     return p_pic;
 678 }
 679