modules/codec/libmpeg2.c

   1 /*****************************************************************************
   2  * libmpeg2.c: mpeg2 video decoder module making use of libmpeg2.
   3  *****************************************************************************
   4  * Copyright (C) 1999-2001 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Gildas Bazin <gbazin@videolan.org>
   8  *          Christophe Massiot <massiot@via.ecp.fr>
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU Lesser General Public License as published by
  12  * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with this program; if not, write to the Free Software Foundation,
  22  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * NOTA BENE: this module requires the linking against a library which is
  27  * known to require licensing under the GNU General Public License version 2
  28  * (or later). Therefore, the result of compiling this module will normally
  29  * be subject to the terms of that later license.
  30  *****************************************************************************/
  31
  32
  33 /*****************************************************************************
  34  * Preamble
  35  *****************************************************************************/
  36 #ifdef HAVE_CONFIG_H
  37 # include "config.h"
  38 #endif
  39 #include <assert.h>
  40
  41 #include <vlc_common.h>
  42 #include <vlc_plugin.h>
  43 #include <vlc_codec.h>
  44 #include <vlc_block_helper.h>
  45 #include <vlc_cpu.h>
  46 #include "cc.h"
  47 #include "synchro.h"
  48
  49 #include <mpeg2.h>
  50
  51 /*****************************************************************************
  52  * decoder_sys_t : libmpeg2 decoder descriptor
  53  *****************************************************************************/
  54 #define DPB_COUNT (3+1)
  55 typedef struct
  56 {
  57     picture_t *p_picture;
  58     bool      b_linked;
  59     bool      b_displayed;
  60 } picture_dpb_t;
  61
  62 typedef struct
  63 {
  64     /*
  65      * libmpeg2 properties
  66      */
  67     mpeg2dec_t          *p_mpeg2dec;
  68     const mpeg2_info_t  *p_info;
  69     bool                b_skip;
  70
  71     /*
  72      * Input properties
  73      */
  74     vlc_tick_t       i_previous_pts;
  75     vlc_tick_t       i_current_pts;
  76     vlc_tick_t       i_previous_dts;
  77     vlc_tick_t       i_current_dts;
  78     bool             b_garbage_pic;
  79     bool             b_after_sequence_header; /* is it the next frame after
  80                                                * the sequence header ?    */
  81     bool             b_slice_i;             /* intra-slice refresh stream */
  82     bool             b_second_field;
  83
  84     bool             b_preroll;
  85
  86     /* */
  87     picture_dpb_t        p_dpb[DPB_COUNT];
  88
  89     /*
  90      * Output properties
  91      */
  92     decoder_synchro_t *p_synchro;
  93     int             i_sar_num;
  94     int             i_sar_den;
  95     vlc_tick_t      i_last_frame_pts;
  96
  97     /* Closed captioning support */
  98     uint32_t        i_cc_flags;
  99     vlc_tick_t      i_cc_pts;
 100     vlc_tick_t      i_cc_dts;
 101 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
 102     cc_data_t       cc;
 103 #endif
 104     uint8_t        *p_gop_user_data;
 105     uint32_t        i_gop_user_data;
 106 } decoder_sys_t;
 107
 108 /*****************************************************************************
 109  * Local prototypes
 110  *****************************************************************************/
 111 static int  OpenDecoder( vlc_object_t * );
 112 static void CloseDecoder( vlc_object_t * );
 113
 114 static int DecodeVideo( decoder_t *, block_t *);
 115 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
 116 static void SendCc( decoder_t *p_dec );
 117 #endif
 118
 119 static picture_t *GetNewPicture( decoder_t * );
 120 static void PutPicture( decoder_t *, picture_t * );
 121
 122 static void GetAR( decoder_t *p_dec );
 123
 124 static void Reset( decoder_t *p_dec );
 125
 126 /* */
 127 static void DpbInit( decoder_t * );
 128 static void DpbClean( decoder_t * );
 129 static picture_t *DpbNewPicture( decoder_t * );
 130 static void DpbUnlinkPicture( decoder_t *, picture_t * );
 131 static int DpbDisplayPicture( decoder_t *, picture_t * );
 132
 133 /*****************************************************************************
 134  * Module descriptor
 135  *****************************************************************************/
 136 vlc_module_begin ()
 137     set_description( N_("MPEG I/II video decoder (using libmpeg2)") )
 138     set_capability( "video decoder", 50 )
 139     set_category( CAT_INPUT )
 140     set_subcategory( SUBCAT_INPUT_VCODEC )
 141     set_callbacks( OpenDecoder, CloseDecoder )
 142     add_shortcut( "libmpeg2" )
 143 vlc_module_end ()
 144
 145 /*****************************************************************************
 146  * OpenDecoder: probe the decoder and return score
 147  *****************************************************************************/
 148 static int OpenDecoder( vlc_object_t *p_this )
 149 {
 150     decoder_t *p_dec = (decoder_t*)p_this;
 151     decoder_sys_t *p_sys;
 152     uint32_t i_accel = 0;
 153
 154     if( p_dec->fmt_in.i_codec != VLC_CODEC_MPGV )
 155         return VLC_EGENERIC;
 156
 157     /* Select onl recognized original format (standard mpeg video) */
 158     switch( p_dec->fmt_in.i_original_fourcc )
 159     {
 160     case VLC_FOURCC('m','p','g','1'):
 161     case VLC_FOURCC('m','p','g','2'):
 162     case VLC_FOURCC('m','p','g','v'):
 163     case VLC_FOURCC('P','I','M','1'):
 164     case VLC_FOURCC('h','d','v','2'):
 165         break;
 166     default:
 167         if( p_dec->fmt_in.i_original_fourcc )
 168             return VLC_EGENERIC;
 169         break;
 170     }
 171
 172     /* Allocate the memory needed to store the decoder's structure */
 173     if( ( p_dec->p_sys = p_sys = calloc( 1, sizeof(*p_sys)) ) == NULL )
 174         return VLC_ENOMEM;
 175
 176     /* Initialize the thread properties */
 177     p_sys->p_mpeg2dec = NULL;
 178     p_sys->p_synchro  = NULL;
 179     p_sys->p_info     = NULL;
 180     p_sys->i_current_pts  = 0;
 181     p_sys->i_previous_pts = 0;
 182     p_sys->i_current_dts  = 0;
 183     p_sys->i_previous_dts = 0;
 184     p_sys->i_sar_num = 0;
 185     p_sys->i_sar_den = 0;
 186     p_sys->b_garbage_pic = false;
 187     p_sys->b_slice_i  = false;
 188     p_sys->b_second_field = false;
 189     p_sys->b_skip     = false;
 190     p_sys->b_preroll = false;
 191     DpbInit( p_dec );
 192
 193     p_sys->i_cc_pts = 0;
 194     p_sys->i_cc_dts = 0;
 195     p_sys->i_cc_flags = 0;
 196 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
 197     cc_Init( &p_sys->cc );
 198 #endif
 199     p_sys->p_gop_user_data = NULL;
 200     p_sys->i_gop_user_data = 0;
 201
 202 #if defined( __i386__ ) || defined( __x86_64__ )
 203     if( vlc_CPU_MMX() )
 204         i_accel |= MPEG2_ACCEL_X86_MMX;
 205     if( vlc_CPU_3dNOW() )
 206         i_accel |= MPEG2_ACCEL_X86_3DNOW;
 207     if( vlc_CPU_MMXEXT() )
 208         i_accel |= MPEG2_ACCEL_X86_MMXEXT;
 209 #elif defined( __powerpc__ ) || defined( __ppc__ ) || defined( __ppc64__ )
 210     if( vlc_CPU_ALTIVEC() )
 211         i_accel |= MPEG2_ACCEL_PPC_ALTIVEC;
 212
 213 #elif defined(__arm__)
 214 # ifdef MPEG2_ACCEL_ARM
 215     i_accel |= MPEG2_ACCEL_ARM;
 216 # endif
 217 # ifdef MPEG2_ACCEL_ARM_NEON
 218     if( vlc_CPU_ARM_NEON() )
 219         i_accel |= MPEG2_ACCEL_ARM_NEON;
 220 # endif
 221
 222     /* TODO: sparc */
 223 #else
 224     /* If we do not know this CPU, trust libmpeg2's feature detection */
 225     i_accel = MPEG2_ACCEL_DETECT;
 226
 227 #endif
 228
 229     /* Set CPU acceleration features */
 230     mpeg2_accel( i_accel );
 231
 232     /* Initialize decoder */
 233     p_sys->p_mpeg2dec = mpeg2_init();
 234     if( p_sys->p_mpeg2dec == NULL)
 235     {
 236         msg_Err( p_dec, "mpeg2_init() failed" );
 237         free( p_sys );
 238         return VLC_EGENERIC;
 239     }
 240
 241     p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );
 242
 243     p_dec->pf_decode = DecodeVideo;
 244     p_dec->pf_flush  = Reset;
 245     p_dec->fmt_out.i_codec = 0;
 246
 247     return VLC_SUCCESS;
 248 }
 249
 250 /*****************************************************************************
 251  * RunDecoder: the libmpeg2 decoder
 252  *****************************************************************************/
 253 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 254 {
 255     decoder_sys_t   *p_sys = p_dec->p_sys;
 256     mpeg2_state_t   state;
 257
 258     block_t *p_block;
 259
 260     if( !pp_block || !*pp_block )
 261         return NULL;
 262
 263     p_block = *pp_block;
 264     if( p_block->i_flags & (BLOCK_FLAG_CORRUPTED) )
 265         Reset( p_dec );
 266
 267     while( 1 )
 268     {
 269         state = mpeg2_parse( p_sys->p_mpeg2dec );
 270
 271         switch( state )
 272         {
 273         case STATE_SEQUENCE:
 274         {
 275             /* */
 276             DpbClean( p_dec );
 277
 278             /* */
 279             mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
 280
 281             if( p_sys->p_synchro )
 282                 decoder_SynchroRelease( p_sys->p_synchro );
 283
 284             if( p_sys->p_info->sequence->frame_period <= 0 )
 285                 p_sys->p_synchro = NULL;
 286             else
 287                 p_sys->p_synchro =
 288                 decoder_SynchroInit( p_dec, (uint32_t)(UINT64_C(1001000000) *
 289                                 27 / p_sys->p_info->sequence->frame_period) );
 290             p_sys->b_after_sequence_header = true;
 291
 292             /* Set the first 2 reference frames */
 293             GetAR( p_dec );
 294             for( int i = 0; i < 2; i++ )
 295             {
 296                 picture_t *p_picture = DpbNewPicture( p_dec );
 297                 if( !p_picture )
 298                 {
 299                     Reset( p_dec );
 300                     block_Release( p_block );
 301                     return NULL;
 302                 }
 303                 PutPicture( p_dec, p_picture );
 304             }
 305             break;
 306         }
 307
 308         case STATE_GOP:
 309             /* There can be userdata in a GOP. It needs to be remembered for the next picture. */
 310             if( p_sys->p_info->user_data_len > 2 )
 311             {
 312                 free( p_sys->p_gop_user_data );
 313                 p_sys->p_gop_user_data = calloc( p_sys->p_info->user_data_len, sizeof(uint8_t) );
 314                 if( p_sys->p_gop_user_data )
 315                 {
 316                     p_sys->i_gop_user_data = p_sys->p_info->user_data_len;
 317                     memcpy( p_sys->p_gop_user_data, p_sys->p_info->user_data, p_sys->p_info->user_data_len );
 318                 }
 319             }
 320             break;
 321
 322         case STATE_PICTURE:
 323         {
 324             const mpeg2_info_t *p_info = p_sys->p_info;
 325             const mpeg2_picture_t *p_current = p_info->current_picture;
 326
 327             vlc_tick_t i_pts, i_dts;
 328
 329             if( p_sys->b_after_sequence_header &&
 330                 (p_current->flags &
 331                     PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P )
 332             {
 333                 /* Intra-slice refresh. Simulate a blank I picture. */
 334                 msg_Dbg( p_dec, "intra-slice refresh stream" );
 335                 decoder_SynchroNewPicture( p_sys->p_synchro,
 336                                            I_CODING_TYPE, 2, 0, 0,
 337                                            p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 338                 decoder_SynchroDecode( p_sys->p_synchro );
 339                 decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 340                 p_sys->b_slice_i = true;
 341             }
 342             p_sys->b_after_sequence_header = false;
 343
 344 #ifdef PIC_FLAG_PTS
 345             i_pts = p_current->flags & PIC_FLAG_PTS ?
 346                 ( ( p_current->pts ==
 347                     (uint32_t)p_sys->i_current_pts ) ?
 348                   p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
 349             i_dts = 0;
 350
 351             /* Hack to handle demuxers which only have DTS timestamps */
 352             if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
 353             {
 354                 if( p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
 355                     (p_current->flags &
 356                       PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
 357                 {
 358                     i_pts = p_block->i_dts;
 359                 }
 360             }
 361             p_block->i_pts = p_block->i_dts = 0;
 362             /* End hack */
 363
 364 #else /* New interface */
 365
 366             i_pts = p_current->flags & PIC_FLAG_TAGS ?
 367                 ( ( p_current->tag == (uint32_t)p_sys->i_current_pts ) ?
 368                             p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
 369             i_dts = p_current->flags & PIC_FLAG_TAGS ?
 370                 ( ( p_current->tag2 == (uint32_t)p_sys->i_current_dts ) ?
 371                             p_sys->i_current_dts : p_sys->i_previous_dts ) : 0;
 372 #endif
 373
 374             /* If nb_fields == 1, it is a field picture, and it will be
 375              * followed by another field picture for which we won't call
 376              * decoder_SynchroNewPicture() because this would have other
 377              * problems, so we take it into account here.
 378              * This kind of sucks, but I didn't think better. --Meuuh
 379              */
 380             decoder_SynchroNewPicture( p_sys->p_synchro,
 381                                        p_current->flags & PIC_MASK_CODING_TYPE,
 382                                        p_current->nb_fields == 1 ? 2 :
 383                                        p_current->nb_fields, i_pts, i_dts,
 384                                        p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 385
 386
 387             picture_t *p_pic;
 388
 389             if( p_dec->b_frame_drop_allowed && !p_sys->b_preroll &&
 390                 !(p_sys->b_slice_i
 391                    && ((p_current->flags
 392                          & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P))
 393                    && !decoder_SynchroChoose( p_sys->p_synchro,
 394                               p_current->flags
 395                                 & PIC_MASK_CODING_TYPE,
 396                               /*p_sys->p_vout->render_time*/ 0 /*FIXME*/,
 397                               p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) )
 398                 p_pic = NULL;
 399             else
 400             {
 401                 p_pic = DpbNewPicture( p_dec );
 402                 if( !p_pic )
 403                 {
 404                     Reset( p_dec );
 405
 406                     p_pic = DpbNewPicture( p_dec );
 407                     if( !p_pic )
 408                     {
 409                         mpeg2_reset( p_sys->p_mpeg2dec, 1 );
 410                         block_Release( p_block );
 411                         return NULL;
 412                     }
 413                 }
 414             }
 415
 416             mpeg2_skip( p_sys->p_mpeg2dec, p_pic == NULL );
 417             p_sys->b_skip = p_pic == NULL;
 418             if( p_pic != NULL )
 419                 decoder_SynchroDecode( p_sys->p_synchro );
 420             else
 421                 decoder_SynchroTrash( p_sys->p_synchro );
 422
 423             PutPicture( p_dec, p_pic );
 424
 425             if( p_info->user_data_len > 2 || p_sys->i_gop_user_data > 2 )
 426             {
 427                 p_sys->i_cc_pts = i_pts;
 428                 p_sys->i_cc_dts = i_dts;
 429                 if( (p_current->flags
 430                              & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P )
 431                     p_sys->i_cc_flags = BLOCK_FLAG_TYPE_P;
 432                 else if( (p_current->flags
 433                              & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
 434                     p_sys->i_cc_flags = BLOCK_FLAG_TYPE_B;
 435                 else p_sys->i_cc_flags = BLOCK_FLAG_TYPE_I;
 436 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
 437                 bool b_top_field_first = p_sys->p_info->current_picture->flags
 438                                            & PIC_FLAG_TOP_FIELD_FIRST;
 439 #endif
 440                 if( p_sys->i_gop_user_data > 2 )
 441                 {
 442                     /* We now have picture info for any cached user_data out of the gop */
 443 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
 444                     cc_ProbeAndExtract( &p_sys->cc, b_top_field_first,
 445                                 &p_sys->p_gop_user_data[0], p_sys->i_gop_user_data );
 446 #endif
 447                     p_sys->i_gop_user_data = 0;
 448                 }
 449
 450                 /* Extract the CC from the user_data of the picture */
 451 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
 452                 if( p_info->user_data_len > 2 )
 453                     cc_ProbeAndExtract( &p_sys->cc, b_top_field_first,
 454                                 &p_info->user_data[0], p_info->user_data_len );
 455
 456                 if( p_sys->cc.i_data )
 457                     SendCc( p_dec );
 458 #endif
 459             }
 460         }
 461         break;
 462
 463
 464         case STATE_BUFFER:
 465             if( !p_block->i_buffer )
 466             {
 467                 block_Release( p_block );
 468                 return NULL;
 469             }
 470
 471             if( (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY
 472                                       | BLOCK_FLAG_CORRUPTED)) &&
 473                 p_sys->p_synchro &&
 474                 p_sys->p_info->sequence &&
 475                 p_sys->p_info->sequence->width != (unsigned)-1 )
 476             {
 477                 decoder_SynchroReset( p_sys->p_synchro );
 478                 if( p_sys->p_info->current_fbuf != NULL &&
 479                     p_sys->p_info->current_fbuf->id != NULL )
 480                 {
 481                     p_sys->b_garbage_pic = true;
 482                 }
 483                 if( p_sys->b_slice_i )
 484                 {
 485                     decoder_SynchroNewPicture( p_sys->p_synchro,
 486                                                I_CODING_TYPE, 2, 0, 0,
 487                                                p_sys->p_info->sequence->flags &
 488                                                             SEQ_FLAG_LOW_DELAY );
 489                     decoder_SynchroDecode( p_sys->p_synchro );
 490                     decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 491                 }
 492             }
 493
 494             if( p_block->i_flags & BLOCK_FLAG_PREROLL )
 495             {
 496                 p_sys->b_preroll = true;
 497             }
 498             else if( p_sys->b_preroll )
 499             {
 500                 p_sys->b_preroll = false;
 501                 if( p_sys->p_synchro )
 502                     decoder_SynchroReset( p_sys->p_synchro );
 503             }
 504
 505 #ifdef PIC_FLAG_PTS
 506             if( p_block->i_pts )
 507             {
 508                 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
 509
 510 #else /* New interface */
 511             if( p_block->i_pts || p_block->i_dts )
 512             {
 513                 mpeg2_tag_picture( p_sys->p_mpeg2dec,
 514                                    (uint32_t)p_block->i_pts,
 515                                    (uint32_t)p_block->i_dts );
 516 #endif
 517                 p_sys->i_previous_pts = p_sys->i_current_pts;
 518                 p_sys->i_current_pts = p_block->i_pts;
 519                 p_sys->i_previous_dts = p_sys->i_current_dts;
 520                 p_sys->i_current_dts = p_block->i_dts;
 521             }
 522
 523             mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
 524                           p_block->p_buffer + p_block->i_buffer );
 525
 526             p_block->i_buffer = 0;
 527             break;
 528
 529 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
 530
 531         case STATE_SEQUENCE_MODIFIED:
 532             GetAR( p_dec );
 533             break;
 534 #endif
 535         case STATE_PICTURE_2ND:
 536             p_sys->b_second_field = true;
 537             break;
 538
 539
 540         case STATE_INVALID_END:
 541         case STATE_END:
 542         case STATE_SLICE:
 543         {
 544             picture_t *p_pic = NULL;
 545
 546             if( p_sys->p_info->display_fbuf &&
 547                 p_sys->p_info->display_fbuf->id )
 548             {
 549                 p_pic = p_sys->p_info->display_fbuf->id;
 550                 if( DpbDisplayPicture( p_dec, p_pic ) )
 551                     p_pic = NULL;
 552
 553                 decoder_SynchroEnd( p_sys->p_synchro,
 554                                     p_sys->p_info->display_picture->flags & PIC_MASK_CODING_TYPE,
 555                                     p_sys->b_garbage_pic );
 556
 557                 if( p_pic )
 558                 {
 559                     p_pic->date = decoder_SynchroDate( p_sys->p_synchro );
 560                     if( p_sys->b_garbage_pic )
 561                         p_pic->date = 0; /* ??? */
 562                     p_sys->b_garbage_pic = false;
 563                 }
 564             }
 565
 566             if( p_sys->p_info->discard_fbuf &&
 567                 p_sys->p_info->discard_fbuf->id )
 568             {
 569                 DpbUnlinkPicture( p_dec, p_sys->p_info->discard_fbuf->id );
 570             }
 571
 572             if( p_pic )
 573             {
 574                 if( state == STATE_END )
 575                     p_pic->b_force = true; /* For still frames */
 576
 577                 /* Avoid frames with identical timestamps.
 578                  * Especially needed for still frames in DVD menus. */
 579                 if( p_sys->i_last_frame_pts == p_pic->date )
 580                     p_pic->date++;
 581                 p_sys->i_last_frame_pts = p_pic->date;
 582                 return p_pic;
 583             }
 584             break;
 585         }
 586
 587         case STATE_INVALID:
 588         {
 589             msg_Err( p_dec, "invalid picture encountered" );
 590             /* I don't think we have anything to do, but well without
 591              * docs ... */
 592             break;
 593         }
 594
 595         default:
 596             break;
 597         }
 598     }
 599
 600     /* Never reached */
 601     return NULL;
 602 }
 603
 604 static int DecodeVideo( decoder_t *p_dec, block_t *p_block)
 605 {
 606     if( p_block == NULL ) /* No Drain */
 607         return VLCDEC_SUCCESS;
 608
 609     block_t **pp_block = &p_block;
 610     picture_t *p_pic;
 611     while( ( p_pic = DecodeBlock( p_dec, pp_block ) ) != NULL )
 612         decoder_QueueVideo( p_dec, p_pic );
 613     return VLCDEC_SUCCESS;
 614 }
 615
 616 /*****************************************************************************
 617  * CloseDecoder: libmpeg2 decoder destruction
 618  *****************************************************************************/
 619 static void CloseDecoder( vlc_object_t *p_this )
 620 {
 621     decoder_t *p_dec = (decoder_t *)p_this;
 622     decoder_sys_t *p_sys = p_dec->p_sys;
 623
 624 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
 625     cc_Flush( &p_sys->cc );
 626 #endif
 627
 628     DpbClean( p_dec );
 629
 630     free( p_sys->p_gop_user_data );
 631
 632     if( p_sys->p_synchro ) decoder_SynchroRelease( p_sys->p_synchro );
 633
 634     if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
 635
 636     free( p_sys );
 637 }
 638
 639 /*****************************************************************************
 640  * Reset: reset the decoder state
 641  *****************************************************************************/
 642 static void Reset( decoder_t *p_dec )
 643 {
 644     decoder_sys_t *p_sys = p_dec->p_sys;
 645
 646 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
 647     cc_Flush( &p_sys->cc );
 648 #endif
 649     mpeg2_reset( p_sys->p_mpeg2dec, 0 );
 650     DpbClean( p_dec );
 651 }
 652
 653 /*****************************************************************************
 654  * GetNewPicture: Get a new picture from the vout and set the buf struct
 655  *****************************************************************************/
 656 static picture_t *GetNewPicture( decoder_t *p_dec )
 657 {
 658     decoder_sys_t *p_sys = p_dec->p_sys;
 659     picture_t *p_pic;
 660
 661     p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
 662     p_dec->fmt_out.video.i_visible_width =
 663         p_sys->p_info->sequence->picture_width;
 664     p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
 665     p_dec->fmt_out.video.i_visible_height =
 666         p_sys->p_info->sequence->picture_height;
 667     p_dec->fmt_out.video.i_sar_num = p_sys->i_sar_num;
 668     p_dec->fmt_out.video.i_sar_den = p_sys->i_sar_den;
 669
 670     if( p_sys->p_info->sequence->frame_period > 0 )
 671     {
 672         p_dec->fmt_out.video.i_frame_rate =
 673             (uint32_t)( (uint64_t)1001000000 * 27 /
 674                         p_sys->p_info->sequence->frame_period );
 675         p_dec->fmt_out.video.i_frame_rate_base = 1001;
 676     }
 677
 678     p_dec->fmt_out.i_codec =
 679         ( p_sys->p_info->sequence->chroma_height <
 680           p_sys->p_info->sequence->height ) ?
 681         VLC_CODEC_I420 : VLC_CODEC_I422;
 682
 683     /* Get a new picture */
 684     if( decoder_UpdateVideoFormat( p_dec ) )
 685         return NULL;
 686     p_pic = decoder_NewPicture( p_dec );
 687
 688     if( p_pic == NULL )
 689         return NULL;
 690
 691     p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
 692         p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
 693     p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
 694         p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
 695     p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
 696         p_sys->p_info->current_picture->nb_fields : 2;
 697
 698     return p_pic;
 699 }
 700
 701 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
 702 /*****************************************************************************
 703  * SendCc: Sends the Closed Captions for the CC decoder.
 704  *****************************************************************************/
 705 static void SendCc( decoder_t *p_dec )
 706 {
 707     decoder_sys_t   *p_sys = p_dec->p_sys;
 708     block_t         *p_cc = NULL;
 709
 710     if( !p_sys->cc.b_reorder && p_sys->cc.i_data <= 0 )
 711         return;
 712
 713     p_cc = block_Alloc( p_sys->cc.i_data);
 714     if( p_cc )
 715     {
 716         memcpy( p_cc->p_buffer, p_sys->cc.p_data, p_sys->cc.i_data );
 717         p_cc->i_dts =
 718         p_cc->i_pts = p_sys->cc.b_reorder ? p_sys->i_cc_pts : p_sys->i_cc_dts;
 719         p_cc->i_flags = p_sys->i_cc_flags & BLOCK_FLAG_TYPE_MASK;
 720         decoder_cc_desc_t desc;
 721         desc.i_608_channels = p_sys->cc.i_608channels;
 722         desc.i_708_channels = p_sys->cc.i_708channels;
 723         desc.i_reorder_depth = p_sys->cc.b_reorder ? 0 : -1;
 724         decoder_QueueCc( p_dec, p_cc, &desc );
 725     }
 726     cc_Flush( &p_sys->cc );
 727     return;
 728 }
 729 #endif
 730
 731 /*****************************************************************************
 732  * GetAR: Get aspect ratio
 733  *****************************************************************************/
 734 static void GetAR( decoder_t *p_dec )
 735 {
 736     decoder_sys_t *p_sys = p_dec->p_sys;
 737     int i_old_sar_num = p_sys->i_sar_num;
 738     int i_old_sar_den = p_sys->i_sar_den;
 739
 740     /* Check whether the input gave a particular aspect ratio */
 741     if( p_dec->fmt_in.video.i_sar_num > 0 &&
 742         p_dec->fmt_in.video.i_sar_den > 0 )
 743     {
 744         p_sys->i_sar_num = p_dec->fmt_in.video.i_sar_num;
 745         p_sys->i_sar_den = p_dec->fmt_in.video.i_sar_den;
 746     }
 747     /* Use the value provided in the MPEG sequence header */
 748     else if( p_sys->p_info->sequence->pixel_height > 0 )
 749     {
 750         p_sys->i_sar_num = p_sys->p_info->sequence->pixel_width;
 751         p_sys->i_sar_den = p_sys->p_info->sequence->pixel_height;
 752     }
 753     else
 754     {
 755         /* Invalid aspect, assume 4:3.
 756          * This shouldn't happen and if it does it is a bug
 757          * in libmpeg2 (likely triggered by an invalid stream) */
 758         p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 4;
 759         p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 3;
 760     }
 761
 762     if( p_sys->i_sar_num == i_old_sar_num &&
 763         p_sys->i_sar_den == i_old_sar_den )
 764         return;
 765
 766     if( p_sys->p_info->sequence->frame_period > 0 )
 767         msg_Dbg( p_dec,
 768                  "%dx%d (display %d,%d), sar %i:%i, %u.%03u fps",
 769                  p_sys->p_info->sequence->picture_width,
 770                  p_sys->p_info->sequence->picture_height,
 771                  p_sys->p_info->sequence->display_width,
 772                  p_sys->p_info->sequence->display_height,
 773                  p_sys->i_sar_num, p_sys->i_sar_den,
 774                  (uint32_t)((uint64_t)1001000000 * 27 /
 775                      p_sys->p_info->sequence->frame_period / 1001),
 776                  (uint32_t)((uint64_t)1001000000 * 27 /
 777                      p_sys->p_info->sequence->frame_period % 1001) );
 778     else
 779         msg_Dbg( p_dec, "bad frame period" );
 780 }
 781
 782 /*****************************************************************************
 783  * PutPicture: Put a picture_t in mpeg2 context
 784  *****************************************************************************/
 785 static void PutPicture( decoder_t *p_dec, picture_t *p_picture )
 786 {
 787     decoder_sys_t *p_sys = p_dec->p_sys;
 788
 789     /* */
 790     uint8_t *pp_buf[3];
 791     for( int j = 0; j < 3; j++ )
 792         pp_buf[j] = p_picture ? p_picture->p[j].p_pixels : NULL;
 793     mpeg2_set_buf( p_sys->p_mpeg2dec, pp_buf, p_picture );
 794
 795     /* Completly broken API, why the hell does it suppose
 796      * the stride of the chroma planes ! */
 797     if( p_picture )
 798         mpeg2_stride( p_sys->p_mpeg2dec, p_picture->p[Y_PLANE].i_pitch );
 799 }
 800
 801
 802 /**
 803  * Initialize a virtual Decoded Picture Buffer to workaround
 804  * libmpeg2 deficient API
 805  */
 806 static void DpbInit( decoder_t *p_dec )
 807 {
 808     decoder_sys_t *p_sys = p_dec->p_sys;
 809
 810     for( int i = 0; i < DPB_COUNT; i++ )
 811         p_sys->p_dpb[i].p_picture = NULL;
 812 }
 813 /**
 814  * Empty and reset the current DPB
 815  */
 816 static void DpbClean( decoder_t *p_dec )
 817 {
 818     decoder_sys_t *p_sys = p_dec->p_sys;
 819
 820     for( int i = 0; i < DPB_COUNT; i++ )
 821     {
 822         picture_dpb_t *p = &p_sys->p_dpb[i];
 823         if( !p->p_picture )
 824             continue;
 825         if( p->b_linked )
 826             picture_Release( p->p_picture );
 827         if( !p->b_displayed )
 828             picture_Release( p->p_picture );
 829
 830         p->p_picture = NULL;
 831     }
 832 }
 833 /**
 834  * Retreive a picture and reserve a place in the DPB
 835  */
 836 static picture_t *DpbNewPicture( decoder_t *p_dec )
 837 {
 838     decoder_sys_t *p_sys = p_dec->p_sys;
 839
 840     picture_dpb_t *p;
 841     int i;
 842
 843     for( i = 0; i < DPB_COUNT; i++ )
 844     {
 845         p = &p_sys->p_dpb[i];
 846         if( !p->p_picture )
 847             break;
 848     }
 849     if( i >= DPB_COUNT )
 850     {
 851         msg_Err( p_dec, "Leaking picture" );
 852         return NULL;
 853     }
 854
 855     p->p_picture = GetNewPicture( p_dec );
 856     if( p->p_picture )
 857     {
 858         picture_Hold( p->p_picture );
 859         p->b_linked = true;
 860         p->b_displayed = false;
 861
 862         p->p_picture->date = 0;
 863     }
 864     return p->p_picture;
 865 }
 866 static picture_dpb_t *DpbFindPicture( decoder_t *p_dec, picture_t *p_picture )
 867 {
 868     decoder_sys_t *p_sys = p_dec->p_sys;
 869
 870     for( int i = 0; i < DPB_COUNT; i++ )
 871     {
 872         picture_dpb_t *p = &p_sys->p_dpb[i];
 873         if( p->p_picture == p_picture )
 874             return p;
 875     }
 876     return NULL;
 877 }
 878 /**
 879  * Unlink the provided picture and ensure that the decoder
 880  * does not own it anymore.
 881  */
 882 static void DpbUnlinkPicture( decoder_t *p_dec, picture_t *p_picture )
 883 {
 884     picture_dpb_t *p = DpbFindPicture( p_dec, p_picture );
 885
 886     /* XXX it is needed to workaround libmpeg2 bugs */
 887     if( !p || !p->b_linked )
 888     {
 889         msg_Err( p_dec, "DpbUnlinkPicture called on an invalid picture" );
 890         return;
 891     }
 892
 893     assert( p && p->b_linked );
 894
 895     picture_Release( p->p_picture );
 896     p->b_linked = false;
 897
 898     if( !p->b_displayed )
 899         picture_Release( p->p_picture );
 900     p->p_picture = NULL;
 901 }
 902 /**
 903  * Mark the provided picture as displayed.
 904  */
 905 static int DpbDisplayPicture( decoder_t *p_dec, picture_t *p_picture )
 906 {
 907     picture_dpb_t *p = DpbFindPicture( p_dec, p_picture );
 908
 909     /* XXX it is needed to workaround libmpeg2 bugs */
 910     if( !p || p->b_displayed || !p->b_linked )
 911     {
 912         msg_Err( p_dec, "DpbDisplayPicture called on an invalid picture" );
 913         return VLC_EGENERIC;
 914     }
 915
 916     assert( p && !p->b_displayed && p->b_linked );
 917
 918     p->b_displayed = true;
 919     return VLC_SUCCESS;
 920 }
 921
 922