git.sesse.net Git - vlc/blob - modules/codec/libmpeg2.c

   1 /*****************************************************************************
   2  * libmpeg2.c: mpeg2 video decoder module making use of libmpeg2.
   3  *****************************************************************************
   4  * Copyright (C) 1999-2001 VideoLAN
   5  * $Id: libmpeg2.c,v 1.34 2003/11/22 23:39:14 fenrir Exp $
   6  *
   7  * Authors: Gildas Bazin <gbazin@netcourrier.com>
   8  *          Christophe Massiot <massiot@via.ecp.fr>
   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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28 #include <vlc/vlc.h>
  29 #include <vlc/vout.h>
  30 #include <vlc/decoder.h>
  31
  32 #include <mpeg2dec/mpeg2.h>
  33
  34 #include "vout_synchro.h"
  35
  36 /* Aspect ratio (ISO/IEC 13818-2 section 6.3.3, table 6-3) */
  37 #define AR_SQUARE_PICTURE       1                           /* square pixels */
  38 #define AR_3_4_PICTURE          2                        /* 3:4 picture (TV) */
  39 #define AR_16_9_PICTURE         3              /* 16:9 picture (wide screen) */
  40 #define AR_221_1_PICTURE        4                  /* 2.21:1 picture (movie) */
  41
  42 /*****************************************************************************
  43  * decoder_sys_t : libmpeg2 decoder descriptor
  44  *****************************************************************************/
  45 struct decoder_sys_t
  46 {
  47     /*
  48      * libmpeg2 properties
  49      */
  50     mpeg2dec_t          *p_mpeg2dec;
  51     const mpeg2_info_t  *p_info;
  52     vlc_bool_t          b_skip;
  53
  54     /*
  55      * Input properties
  56      */
  57     pes_packet_t     *p_pes;                  /* current PES we are decoding */
  58     mtime_t          i_pts;
  59     mtime_t          i_previous_pts;
  60     mtime_t          i_current_pts;
  61     int              i_current_rate;
  62     picture_t *      p_picture_to_destroy;
  63     vlc_bool_t       b_garbage_pic;
  64     vlc_bool_t       b_after_sequence_header; /* is it the next frame after
  65                                                * the sequence header ?    */
  66     vlc_bool_t       b_slice_i;             /* intra-slice refresh stream */
  67
  68     /*
  69      * Output properties
  70      */
  71     vout_synchro_t *p_synchro;
  72     int i_aspect;
  73
  74 };
  75
  76 /*****************************************************************************
  77  * Local prototypes
  78  *****************************************************************************/
  79 static int  OpenDecoder( vlc_object_t * );
  80 static void CloseDecoder( vlc_object_t * );
  81
  82 static picture_t *DecodeBlock( decoder_t *, block_t ** );
  83
  84 static picture_t *GetNewPicture( decoder_t *, uint8_t ** );
  85
  86 /*****************************************************************************
  87  * Module descriptor
  88  *****************************************************************************/
  89 vlc_module_begin();
  90     set_description( _("MPEG I/II video decoder (using libmpeg2)") );
  91     set_capability( "decoder", 150 );
  92     set_callbacks( OpenDecoder, CloseDecoder );
  93     add_shortcut( "libmpeg2" );
  94 vlc_module_end();
  95
  96 /*****************************************************************************
  97  * OpenDecoder: probe the decoder and return score
  98  *****************************************************************************/
  99 static int OpenDecoder( vlc_object_t *p_this )
 100 {
 101     decoder_t *p_dec = (decoder_t*)p_this;
 102     decoder_sys_t *p_sys;
 103
 104     if( p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','v') &&
 105         p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','1') &&
 106         /* Pinnacle hardware-mpeg1 */
 107         p_dec->fmt_in.i_codec != VLC_FOURCC('P','I','M','1') &&
 108         /* ATI Video */
 109         p_dec->fmt_in.i_codec != VLC_FOURCC('V','C','R','2') &&
 110         p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','2') )
 111     {
 112         return VLC_EGENERIC;
 113     }
 114
 115     /* Allocate the memory needed to store the decoder's structure */
 116     if( ( p_dec->p_sys = p_sys =
 117           (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
 118     {
 119         msg_Err( p_dec, "out of memory" );
 120         return VLC_EGENERIC;
 121     }
 122
 123     /* Initialize the thread properties */
 124     memset( p_sys, 0, sizeof(decoder_sys_t) );
 125     p_sys->p_pes      = NULL;
 126     p_sys->p_mpeg2dec = NULL;
 127     p_sys->p_synchro  = NULL;
 128     p_sys->p_info     = NULL;
 129     p_sys->i_pts      = mdate() + DEFAULT_PTS_DELAY;
 130     p_sys->i_current_pts  = 0;
 131     p_sys->i_previous_pts = 0;
 132     p_sys->p_picture_to_destroy = NULL;
 133     p_sys->b_garbage_pic = 0;
 134     p_sys->b_slice_i  = 0;
 135     p_sys->b_skip     = 0;
 136
 137     /* Initialize decoder */
 138     p_sys->p_mpeg2dec = mpeg2_init();
 139     if( p_sys->p_mpeg2dec == NULL)
 140     {
 141         msg_Err( p_dec, "mpeg2_init() failed" );
 142         free( p_sys );
 143         return VLC_EGENERIC;
 144     }
 145
 146     p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );
 147
 148     p_dec->pf_decode_video = DecodeBlock;
 149
 150     return VLC_SUCCESS;
 151 }
 152
 153 /*****************************************************************************
 154  * RunDecoder: the libmpeg2 decoder
 155  *****************************************************************************/
 156 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 157 {
 158     decoder_sys_t   *p_sys = p_dec->p_sys;
 159     mpeg2_state_t   state;
 160     picture_t       *p_pic;
 161
 162     block_t *p_block;
 163
 164     if( !pp_block || !*pp_block ) return NULL;
 165
 166     p_block = *pp_block;
 167
 168     while( 1 )
 169     {
 170         state = mpeg2_parse( p_sys->p_mpeg2dec );
 171
 172         switch( state )
 173         {
 174         case STATE_BUFFER:
 175             if( !p_block->i_buffer )
 176             {
 177                 block_Release( p_block );
 178                 return NULL;
 179             }
 180
 181             if( p_block->b_discontinuity && p_sys->p_synchro
 182                 && p_sys->p_info->sequence->width != (unsigned)-1 )
 183             {
 184                 vout_SynchroReset( p_sys->p_synchro );
 185                 if( p_sys->p_info->current_fbuf != NULL
 186                     && p_sys->p_info->current_fbuf->id != NULL )
 187                 {
 188                     p_sys->b_garbage_pic = 1;
 189                     p_pic = p_sys->p_info->current_fbuf->id;
 190                 }
 191                 else
 192                 {
 193                     uint8_t *buf[3];
 194                     buf[0] = buf[1] = buf[2] = NULL;
 195                     if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 196                         break;
 197                     mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 198                 }
 199                 p_sys->p_picture_to_destroy = p_pic;
 200
 201                 if ( p_sys->b_slice_i )
 202                 {
 203                     vout_SynchroNewPicture( p_sys->p_synchro,
 204                         I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
 205                     vout_SynchroDecode( p_sys->p_synchro );
 206                     vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 207                 }
 208             }
 209
 210             if( p_block->i_pts )
 211             {
 212                 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
 213                 p_sys->i_previous_pts = p_sys->i_current_pts;
 214                 p_sys->i_current_pts = p_block->i_pts;
 215             }
 216
 217             p_sys->i_current_rate = DEFAULT_RATE;//p_pes->i_rate;
 218
 219             mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
 220                           p_block->p_buffer + p_block->i_buffer );
 221
 222             p_block->i_buffer = 0;
 223             break;
 224
 225         case STATE_SEQUENCE:
 226         {
 227             /* Initialize video output */
 228             uint8_t *buf[3];
 229             buf[0] = buf[1] = buf[2] = NULL;
 230
 231             /* Check whether the input gave a particular aspect ratio */
 232             if( p_dec->fmt_in.video.i_aspect )
 233             {
 234                 p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
 235                 switch( p_sys->i_aspect )
 236                 {
 237                 case AR_3_4_PICTURE:
 238                     p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
 239                     break;
 240                 case AR_16_9_PICTURE:
 241                     p_sys->i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
 242                     break;
 243                 case AR_221_1_PICTURE:
 244                     p_sys->i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
 245                     break;
 246                 case AR_SQUARE_PICTURE:
 247                 default:
 248                     p_sys->i_aspect = VOUT_ASPECT_FACTOR *
 249                                    p_sys->p_info->sequence->width /
 250                                    p_sys->p_info->sequence->height;
 251                     break;
 252                 }
 253             }
 254             else
 255             {
 256                 /* Use the value provided in the MPEG sequence header */
 257                 p_sys->i_aspect =
 258                     ((uint64_t)p_sys->p_info->sequence->display_width) *
 259                     p_sys->p_info->sequence->pixel_width * VOUT_ASPECT_FACTOR /
 260                     p_sys->p_info->sequence->display_height /
 261                     p_sys->p_info->sequence->pixel_height;
 262             }
 263
 264             msg_Dbg( p_dec, "%dx%d, aspect %d, %u.%03u fps",
 265                      p_sys->p_info->sequence->width,
 266                      p_sys->p_info->sequence->height, p_sys->i_aspect,
 267                      (uint32_t)((uint64_t)1001000000 * 27 /
 268                          p_sys->p_info->sequence->frame_period / 1001),
 269                      (uint32_t)((uint64_t)1001000000 * 27 /
 270                          p_sys->p_info->sequence->frame_period % 1001) );
 271
 272             mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
 273
 274             /* Set the first 2 reference frames */
 275             mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
 276
 277             if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 278             {
 279                 block_Release( p_block );
 280                 return NULL;
 281             }
 282
 283             mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 284
 285             /* This picture will never go through display_picture. */
 286             p_pic->date = 0;
 287
 288             /* For some reason, libmpeg2 will put this pic twice in
 289              * discard_picture. This can be considered a bug in libmpeg2. */
 290             //vout_LinkPicture( p_sys->p_vout, p_pic );
 291
 292             if( p_sys->p_synchro )
 293             {
 294                 vout_SynchroRelease( p_sys->p_synchro );
 295             }
 296             p_sys->p_synchro = vout_SynchroInit( p_dec,
 297                 (uint32_t)((uint64_t)1001000000 * 27 /
 298                 p_sys->p_info->sequence->frame_period) );
 299             p_sys->b_after_sequence_header = 1;
 300         }
 301         break;
 302
 303         case STATE_PICTURE_2ND:
 304             vout_SynchroNewPicture( p_sys->p_synchro,
 305                 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
 306                 p_sys->p_info->current_picture->nb_fields,
 307                 0, 0, p_sys->i_current_rate );
 308
 309             if( p_sys->b_skip )
 310             {
 311                 vout_SynchroTrash( p_sys->p_synchro );
 312             }
 313             else
 314             {
 315                 vout_SynchroDecode( p_sys->p_synchro );
 316             }
 317             break;
 318
 319         case STATE_PICTURE:
 320         {
 321             uint8_t *buf[3];
 322             buf[0] = buf[1] = buf[2] = NULL;
 323
 324             if ( p_sys->b_after_sequence_header &&
 325                  ((p_sys->p_info->current_picture->flags &
 326                        PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P) )
 327             {
 328                 /* Intra-slice refresh. Simulate a blank I picture. */
 329                 msg_Dbg( p_dec, "intra-slice refresh stream" );
 330                 vout_SynchroNewPicture( p_sys->p_synchro,
 331                     I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
 332                 vout_SynchroDecode( p_sys->p_synchro );
 333                 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 334                 p_sys->b_slice_i = 1;
 335             }
 336             p_sys->b_after_sequence_header = 0;
 337
 338             vout_SynchroNewPicture( p_sys->p_synchro,
 339                 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
 340                 p_sys->p_info->current_picture->nb_fields,
 341                 (p_sys->p_info->current_picture->flags & PIC_FLAG_PTS) ?
 342                     ( ( p_sys->p_info->current_picture->pts ==
 343                         (uint32_t)p_sys->i_current_pts ) ?
 344                       p_sys->i_current_pts : p_sys->i_previous_pts ) : 0,
 345                 0, p_sys->i_current_rate );
 346
 347             if ( !(p_sys->b_slice_i
 348                    && ((p_sys->p_info->current_picture->flags
 349                          & PIC_MASK_CODING_TYPE) == P_CODING_TYPE))
 350                    && !vout_SynchroChoose( p_sys->p_synchro,
 351                               p_sys->p_info->current_picture->flags
 352                                 & PIC_MASK_CODING_TYPE,
 353                               /*p_sys->p_vout->render_time*/ 0 /*FIXME*/ ) )
 354             {
 355                 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
 356                 p_sys->b_skip = 1;
 357                 vout_SynchroTrash( p_sys->p_synchro );
 358                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
 359             }
 360             else
 361             {
 362                 mpeg2_skip( p_sys->p_mpeg2dec, 0 );
 363                 p_sys->b_skip = 0;
 364                 vout_SynchroDecode( p_sys->p_synchro );
 365
 366                 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 367                 {
 368                     block_Release( p_block );
 369                     return NULL;
 370                 }
 371
 372                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 373             }
 374         }
 375         break;
 376
 377         case STATE_END:
 378         case STATE_SLICE:
 379             if( p_sys->p_info->display_fbuf
 380                 && p_sys->p_info->display_fbuf->id )
 381             {
 382                 p_pic = (picture_t *)p_sys->p_info->display_fbuf->id;
 383
 384                 vout_SynchroEnd( p_sys->p_synchro,
 385                             p_sys->p_info->display_picture->flags
 386                              & PIC_MASK_CODING_TYPE,
 387                             p_sys->b_garbage_pic );
 388                 p_sys->b_garbage_pic = 0;
 389
 390                 if ( p_sys->p_picture_to_destroy != p_pic )
 391                 {
 392                     p_pic->date = vout_SynchroDate( p_sys->p_synchro );
 393                 }
 394                 else
 395                 {
 396                     p_sys->p_picture_to_destroy = NULL;
 397                     p_pic->date = 0;
 398                 }
 399             return p_pic; /* FIXME */
 400             }
 401
 402             if( p_sys->p_info->discard_fbuf &&
 403                 p_sys->p_info->discard_fbuf->id )
 404             {
 405                 //p_pic = (picture_t *)p_sys->p_info->discard_fbuf->id;
 406                 //vout_UnlinkPicture( p_sys->p_vout, p_pic );
 407             }
 408
 409             //return p_pic; /* FIXME */
 410
 411             break;
 412
 413         case STATE_INVALID:
 414         {
 415             uint8_t *buf[3];
 416             buf[0] = buf[1] = buf[2] = NULL;
 417
 418             msg_Warn( p_dec, "invalid picture encountered" );
 419             if ( ( p_sys->p_info->current_picture == NULL ) ||
 420                ( ( p_sys->p_info->current_picture->flags &
 421                    PIC_MASK_CODING_TYPE) != B_CODING_TYPE ) )
 422             {
 423                 vout_SynchroReset( p_sys->p_synchro );
 424             }
 425             mpeg2_skip( p_sys->p_mpeg2dec, 1 );
 426             p_sys->b_skip = 1;
 427
 428             if( p_sys->p_info->current_fbuf &&
 429                 p_sys->p_info->current_fbuf->id )
 430             {
 431                 p_sys->b_garbage_pic = 1;
 432                 p_pic = p_sys->p_info->current_fbuf->id;
 433             }
 434             else
 435             {
 436                 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 437                     break;
 438                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 439             }
 440             p_sys->p_picture_to_destroy = p_pic;
 441
 442             memset( p_pic->p[0].p_pixels, 0,
 443                     p_sys->p_info->sequence->width
 444                      * p_sys->p_info->sequence->height );
 445             memset( p_pic->p[1].p_pixels, 0x80,
 446                     p_sys->p_info->sequence->width
 447                      * p_sys->p_info->sequence->height / 4 );
 448             memset( p_pic->p[2].p_pixels, 0x80,
 449                     p_sys->p_info->sequence->width
 450                      * p_sys->p_info->sequence->height / 4 );
 451
 452             if( p_sys->b_slice_i )
 453             {
 454                 vout_SynchroNewPicture( p_sys->p_synchro,
 455                             I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
 456                 vout_SynchroDecode( p_sys->p_synchro );
 457                 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 458             }
 459             break;
 460         }
 461
 462         default:
 463             break;
 464         }
 465     }
 466
 467     /* Never reached */
 468     return NULL;
 469 }
 470
 471 /*****************************************************************************
 472  * CloseDecoder: libmpeg2 decoder destruction
 473  *****************************************************************************/
 474 static void CloseDecoder( vlc_object_t *p_this )
 475 {
 476     decoder_t *p_dec = (decoder_t *)p_this;
 477     decoder_sys_t *p_sys = p_dec->p_sys;
 478
 479     if( p_sys->p_synchro ) vout_SynchroRelease( p_sys->p_synchro );
 480
 481     if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
 482
 483     free( p_sys );
 484 }
 485
 486 /*****************************************************************************
 487  * GetNewPicture: Get a new picture from the vout and set the buf struct
 488  *****************************************************************************/
 489 static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf )
 490 {
 491     decoder_sys_t *p_sys = p_dec->p_sys;
 492     picture_t *p_pic;
 493
 494     p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
 495     p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
 496     p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
 497
 498     p_dec->fmt_out.i_codec =
 499         ( p_sys->p_info->sequence->chroma_height <
 500           p_sys->p_info->sequence->height ) ?
 501         VLC_FOURCC('I','4','2','0') : VLC_FOURCC('I','4','2','2');
 502
 503     /* Get a new picture */
 504     p_pic = p_dec->pf_vout_buffer_new( p_dec );
 505
 506     if( p_pic == NULL ) return NULL;
 507
 508     p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
 509         p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
 510     p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
 511         p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
 512     p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
 513         p_sys->p_info->current_picture->nb_fields : 2;
 514
 515     //vout_LinkPicture( p_sys->p_vout, p_pic );
 516
 517     pp_buf[0] = p_pic->p[0].p_pixels;
 518     pp_buf[1] = p_pic->p[1].p_pixels;
 519     pp_buf[2] = p_pic->p[2].p_pixels;
 520
 521     return p_pic;
 522 }