git.sesse.net Git - vlc/blob - modules/packetizer/h264.c

   1 /*****************************************************************************
   2  * h264.c: h264/avc video packetizer
   3  *****************************************************************************
   4  * Copyright (C) 2001, 2002, 2006 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   8  *          Eric Petit <titer@videolan.org>
   9  *          Gildas Bazin <gbazin@videolan.org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  24  *****************************************************************************/
  25
  26 /*****************************************************************************
  27  * Preamble
  28  *****************************************************************************/
  29 #include <stdlib.h>                                      /* malloc(), free() */
  30
  31 #include <vlc/vlc.h>
  32 #include <vlc/decoder.h>
  33 #include <vlc/sout.h>
  34
  35 #include "vlc_block_helper.h"
  36 #include "vlc_bits.h"
  37
  38 /*****************************************************************************
  39  * Module descriptor
  40  *****************************************************************************/
  41 static int  Open ( vlc_object_t * );
  42 static void Close( vlc_object_t * );
  43
  44 vlc_module_begin();
  45     set_category( CAT_SOUT );
  46     set_subcategory( SUBCAT_SOUT_PACKETIZER );
  47     set_description( _("H.264 video packetizer") );
  48     set_capability( "packetizer", 50 );
  49     set_callbacks( Open, Close );
  50 vlc_module_end();
  51
  52
  53 /****************************************************************************
  54  * Local prototypes
  55  ****************************************************************************/
  56 static block_t *Packetize( decoder_t *, block_t ** );
  57 static block_t *PacketizeAVC1( decoder_t *, block_t ** );
  58
  59 struct decoder_sys_t
  60 {
  61     block_bytestream_t bytestream;
  62
  63     int     i_state;
  64     int     i_offset;
  65     uint8_t startcode[4];
  66
  67     vlc_bool_t b_slice;
  68     block_t    *p_frame;
  69
  70     vlc_bool_t   b_sps;
  71     vlc_bool_t   b_pps;
  72
  73     /* avcC data */
  74     int i_avcC_length_size;
  75     block_t *p_sps;
  76     block_t *p_pps;
  77
  78     /* Useful values of the Sequence Parameter Set */
  79     int i_log2_max_frame_num;
  80     int b_frame_mbs_only;
  81
  82     /* Useful values of the Slice Header */
  83     int i_nal_type;
  84     int i_nal_ref_idc;
  85     int i_idr_pic_id;
  86     int i_frame_num;
  87     int i_frame_type;
  88 };
  89
  90 enum
  91 {
  92     STATE_NOSYNC,
  93     STATE_NEXT_SYNC,
  94 };
  95
  96 enum nal_unit_type_e
  97 {
  98     NAL_UNKNOWN = 0,
  99     NAL_SLICE   = 1,
 100     NAL_SLICE_DPA   = 2,
 101     NAL_SLICE_DPB   = 3,
 102     NAL_SLICE_DPC   = 4,
 103     NAL_SLICE_IDR   = 5,    /* ref_idc != 0 */
 104     NAL_SEI         = 6,    /* ref_idc == 0 */
 105     NAL_SPS         = 7,
 106     NAL_PPS         = 8,
 107     NAL_AU_DELIMITER= 9
 108     /* ref_idc == 0 for 6,9,10,11,12 */
 109 };
 110
 111 enum nal_priority_e
 112 {
 113     NAL_PRIORITY_DISPOSABLE = 0,
 114     NAL_PRIORITY_LOW        = 1,
 115     NAL_PRIORITY_HIGH       = 2,
 116     NAL_PRIORITY_HIGHEST    = 3,
 117 };
 118
 119 static block_t *ParseNALBlock( decoder_t *, block_t * );
 120
 121 static block_t *nal_get_annexeb( decoder_t *, uint8_t *p, int );
 122
 123 /*****************************************************************************
 124  * Open: probe the packetizer and return score
 125  * When opening after demux, the packetizer is only loaded AFTER the decoder
 126  * That means that what you set in fmt_out is ignored by the decoder in this special case
 127  *****************************************************************************/
 128 static int Open( vlc_object_t *p_this )
 129 {
 130     decoder_t     *p_dec = (decoder_t*)p_this;
 131     decoder_sys_t *p_sys;
 132
 133     if( p_dec->fmt_in.i_codec != VLC_FOURCC( 'h', '2', '6', '4') &&
 134         p_dec->fmt_in.i_codec != VLC_FOURCC( 'H', '2', '6', '4') &&
 135         p_dec->fmt_in.i_codec != VLC_FOURCC( 'V', 'S', 'S', 'H') &&
 136         p_dec->fmt_in.i_codec != VLC_FOURCC( 'v', 's', 's', 'h') &&
 137         ( p_dec->fmt_in.i_codec != VLC_FOURCC( 'a', 'v', 'c', '1') ||
 138           p_dec->fmt_in.i_extra < 7 ) )
 139     {
 140         return VLC_EGENERIC;
 141     }
 142
 143     /* Allocate the memory needed to store the decoder's structure */
 144     if( ( p_dec->p_sys = p_sys = malloc( sizeof(decoder_sys_t) ) ) == NULL )
 145     {
 146         msg_Err( p_dec, "out of memory" );
 147         return VLC_EGENERIC;
 148     }
 149     p_sys->i_state = STATE_NOSYNC;
 150     p_sys->i_offset = 0;
 151     p_sys->startcode[0] = 0;
 152     p_sys->startcode[1] = 0;
 153     p_sys->startcode[2] = 0;
 154     p_sys->startcode[3] = 1;
 155     p_sys->bytestream = block_BytestreamInit( p_dec );
 156     p_sys->b_slice = VLC_FALSE;
 157     p_sys->p_frame = NULL;
 158     p_sys->b_sps   = VLC_FALSE;
 159     p_sys->b_pps   = VLC_FALSE;
 160     p_sys->p_sps   = 0;
 161     p_sys->p_pps   = 0;
 162
 163     p_sys->i_nal_type = -1;
 164     p_sys->i_nal_ref_idc = -1;
 165     p_sys->i_idr_pic_id = -1;
 166     p_sys->i_frame_num = -1;
 167     p_sys->i_frame_type = 0;
 168
 169     /* Setup properties */
 170     es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
 171     p_dec->fmt_out.i_codec = VLC_FOURCC( 'h', '2', '6', '4' );
 172
 173     if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'a', 'v', 'c', '1' ) )
 174     {
 175         /* This type of stream is produced by mp4 and matroska
 176          * when we want to store it in another streamformat, you need to convert
 177          * The fmt_in.p_extra should ALWAYS contain the avcC
 178          * The fmt_out.p_extra should contain all the SPS and PPS with 4 byte startcodes */
 179         uint8_t *p = &((uint8_t*)p_dec->fmt_in.p_extra)[4];
 180         int i_sps, i_pps;
 181         int i;
 182
 183         /* Parse avcC */
 184         p_sys->i_avcC_length_size = 1 + ((*p++)&0x03);
 185
 186         /* Read SPS */
 187         i_sps = (*p++)&0x1f;
 188         for( i = 0; i < i_sps; i++ )
 189         {
 190             int i_length = GetWBE( p );
 191             block_t *p_sps = nal_get_annexeb( p_dec, p + 2, i_length );
 192
 193             p_sys->p_sps = block_Duplicate( p_sps );
 194             p_sps->i_pts = p_sps->i_dts = mdate();
 195             ParseNALBlock( p_dec, p_sps );
 196             p += 2 + i_length;
 197         }
 198         /* Read PPS */
 199         i_pps = *p++;
 200         for( i = 0; i < i_pps; i++ )
 201         {
 202             int i_length = GetWBE( p );
 203             block_t *p_pps = nal_get_annexeb( p_dec, p + 2, i_length );
 204
 205             p_sys->p_pps = block_Duplicate( p_pps );
 206             p_pps->i_pts = p_pps->i_dts = mdate();
 207             ParseNALBlock( p_dec, p_pps );
 208             p += 2 + i_length;
 209         }
 210         msg_Dbg( p_dec, "avcC length size=%d, sps=%d, pps=%d",
 211                  p_sys->i_avcC_length_size, i_sps, i_pps );
 212
 213         /* FIXME: FFMPEG isn't happy at all if you leave this */
 214         if( p_dec->fmt_out.i_extra ) free( p_dec->fmt_out.p_extra );
 215         p_dec->fmt_out.i_extra = 0; p_dec->fmt_out.p_extra = NULL;
 216
 217         /* Set the new extradata */
 218         p_dec->fmt_out.i_extra = p_sys->p_pps->i_buffer + p_sys->p_sps->i_buffer;
 219         p_dec->fmt_out.p_extra = (uint8_t*)malloc( p_dec->fmt_out.i_extra );
 220         memcpy( p_dec->fmt_out.p_extra, p_sys->p_sps->p_buffer, p_sys->p_sps->i_buffer);
 221         memcpy( p_dec->fmt_out.p_extra+p_sys->p_sps->i_buffer, p_sys->p_pps->p_buffer, p_sys->p_pps->i_buffer);
 222
 223         /* Set callback */
 224         p_dec->pf_packetize = PacketizeAVC1;
 225     }
 226     else
 227     {
 228         /* This type of stream contains data with 3 of 4 byte startcodes
 229          * The fmt_in.p_extra MAY contain SPS/PPS with 4 byte startcodes
 230          * The fmt_out.p_extra should be the same */
 231
 232         /* Set callback */
 233         p_dec->pf_packetize = Packetize;
 234
 235         /* */
 236         if( p_dec->fmt_in.i_extra > 0 )
 237         {
 238             block_t *p_init = block_New( p_dec, p_dec->fmt_in.i_extra );
 239             block_t *p_pic;
 240
 241             memcpy( p_init->p_buffer, p_dec->fmt_in.p_extra,
 242                     p_dec->fmt_in.i_extra );
 243
 244             while( ( p_pic = Packetize( p_dec, &p_init ) ) )
 245             {
 246                 /* Should not occur because we should only receive SPS/PPS */
 247                 block_Release( p_pic );
 248             }
 249         }
 250     }
 251
 252     return VLC_SUCCESS;
 253 }
 254
 255 /*****************************************************************************
 256  * Close: clean up the packetizer
 257  *****************************************************************************/
 258 static void Close( vlc_object_t *p_this )
 259 {
 260     decoder_t *p_dec = (decoder_t*)p_this;
 261     decoder_sys_t *p_sys = p_dec->p_sys;
 262
 263     if( p_sys->p_frame ) block_ChainRelease( p_sys->p_frame );
 264     if( p_sys->p_sps ) block_Release( p_sys->p_sps );
 265     if( p_sys->p_pps ) block_Release( p_sys->p_pps );
 266     block_BytestreamRelease( &p_sys->bytestream );
 267     free( p_sys );
 268 }
 269
 270 /****************************************************************************
 271  * Packetize: the whole thing
 272  * Search for the startcodes 3 or more bytes
 273  * Feed ParseNALBlock ALWAYS with 4 byte startcode prepended NALs
 274  ****************************************************************************/
 275 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
 276 {
 277     decoder_sys_t *p_sys = p_dec->p_sys;
 278     block_t       *p_pic;
 279
 280     if( !pp_block || !*pp_block ) return NULL;
 281
 282     block_BytestreamPush( &p_sys->bytestream, *pp_block );
 283
 284     for( ;; )
 285     {
 286         switch( p_sys->i_state )
 287         {
 288             case STATE_NOSYNC:
 289                 /* Skip until 3 byte startcode 0 0 1 */
 290                 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
 291                       &p_sys->i_offset, p_sys->startcode+1, 3 ) == VLC_SUCCESS)
 292                 {
 293                     p_sys->i_state = STATE_NEXT_SYNC;
 294                 }
 295
 296                 if( p_sys->i_offset )
 297                 {
 298                     /* skip the data */
 299                     block_SkipBytes( &p_sys->bytestream, p_sys->i_offset );
 300                     p_sys->i_offset = 0;
 301                     block_BytestreamFlush( &p_sys->bytestream );
 302                 }
 303
 304                 if( p_sys->i_state != STATE_NEXT_SYNC )
 305                 {
 306                     /* Need more data */
 307                     return NULL;
 308                 }
 309
 310                 p_sys->i_offset = 1; /* To find next startcode */
 311
 312             case STATE_NEXT_SYNC:
 313                 /* Find the next 3 byte startcode 0 0 1*/
 314                 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
 315                       &p_sys->i_offset, p_sys->startcode+1, 3 ) != VLC_SUCCESS)
 316                 {
 317                     /* Need more data */
 318                     return NULL;
 319                 }
 320
 321                 /* Get the new fragment and set the pts/dts */
 322                 p_pic = block_New( p_dec, p_sys->i_offset +1 );
 323                 p_pic->i_pts = p_sys->bytestream.p_block->i_pts;
 324                 p_pic->i_dts = p_sys->bytestream.p_block->i_dts;
 325                 /* Force 4 byte startcode 0 0 0 1 */
 326                 p_pic->p_buffer[0] = 0;
 327
 328                 block_GetBytes( &p_sys->bytestream, &p_pic->p_buffer[1],
 329                                 p_pic->i_buffer-1 );
 330
 331                 /* Remove trailing 0 bytes */
 332                 while( p_pic->i_buffer && (!p_pic->p_buffer[p_pic->i_buffer-1] ) ) p_pic->i_buffer--;
 333                 p_sys->i_offset = 0;
 334
 335                 /* Parse the NAL */
 336                 if( !( p_pic = ParseNALBlock( p_dec, p_pic ) ) )
 337                 {
 338                     p_sys->i_state = STATE_NOSYNC;
 339                     break;
 340                 }
 341 #if 0
 342                 msg_Dbg( p_dec, "pts="I64Fd" dts="I64Fd,
 343                          p_pic->i_pts, p_pic->i_dts );
 344 #endif
 345
 346                 /* So p_block doesn't get re-added several times */
 347                 *pp_block = block_BytestreamPop( &p_sys->bytestream );
 348
 349                 p_sys->i_state = STATE_NOSYNC;
 350
 351                 return p_pic;
 352         }
 353     }
 354 }
 355
 356 /****************************************************************************
 357  * PacketizeAVC1: Takes VCL blocks of data and creates annexe B type NAL stream
 358  * Will always use 4 byte 0 0 0 1 startcodes
 359  * Will prepend a SPS and PPS before each keyframe
 360  ****************************************************************************/
 361 static block_t *PacketizeAVC1( decoder_t *p_dec, block_t **pp_block )
 362 {
 363     decoder_sys_t *p_sys = p_dec->p_sys;
 364     block_t       *p_block;
 365     block_t       *p_ret = NULL;
 366     uint8_t       *p;
 367
 368     if( !pp_block || !*pp_block ) return NULL;
 369
 370     p_block = *pp_block;
 371     *pp_block = NULL;
 372
 373     for( p = p_block->p_buffer; p < &p_block->p_buffer[p_block->i_buffer]; )
 374     {
 375         block_t *p_pic;
 376         int i_size = 0;
 377         int i;
 378
 379         for( i = 0; i < p_sys->i_avcC_length_size; i++ )
 380         {
 381             i_size = (i_size << 8) | (*p++);
 382         }
 383
 384         if( i_size > 0 )
 385         {
 386             block_t *p_part = nal_get_annexeb( p_dec, p, i_size );
 387
 388             p_part->i_dts = p_block->i_dts;
 389             p_part->i_pts = p_block->i_pts;
 390
 391             /* Parse the NAL */
 392             if( ( p_pic = ParseNALBlock( p_dec, p_part ) ) )
 393             {
 394                 block_ChainAppend( &p_ret, p_pic );
 395             }
 396         }
 397         p += i_size;
 398     }
 399     block_Release( p_block );
 400
 401     return p_ret;
 402 }
 403
 404 static block_t *nal_get_annexeb( decoder_t *p_dec, uint8_t *p, int i_size )
 405 {
 406     block_t *p_nal;
 407
 408     p_nal = block_New( p_dec, 4 + i_size );
 409
 410     /* Add start code */
 411     p_nal->p_buffer[0] = 0x00;
 412     p_nal->p_buffer[1] = 0x00;
 413     p_nal->p_buffer[2] = 0x00;
 414     p_nal->p_buffer[3] = 0x01;
 415
 416     /* Copy nalu */
 417     memcpy( &p_nal->p_buffer[4], p, i_size );
 418
 419     return p_nal;
 420 }
 421
 422 static void nal_get_decoded( uint8_t **pp_ret, int *pi_ret,
 423                              uint8_t *src, int i_src )
 424 {
 425     uint8_t *end = &src[i_src];
 426     uint8_t *dst = malloc( i_src );
 427
 428     *pp_ret = dst;
 429
 430     while( src < end )
 431     {
 432         if( src < end - 3 && src[0] == 0x00 && src[1] == 0x00 &&
 433             src[2] == 0x03 )
 434         {
 435             *dst++ = 0x00;
 436             *dst++ = 0x00;
 437
 438             src += 3;
 439             continue;
 440         }
 441         *dst++ = *src++;
 442     }
 443
 444     *pi_ret = dst - *pp_ret;
 445 }
 446
 447 static inline int bs_read_ue( bs_t *s )
 448 {
 449     int i = 0;
 450
 451     while( bs_read1( s ) == 0 && s->p < s->p_end && i < 32 )
 452     {
 453         i++;
 454     }
 455     return( ( 1 << i) - 1 + bs_read( s, i ) );
 456 }
 457
 458 static inline int bs_read_se( bs_t *s )
 459 {
 460     int val = bs_read_ue( s );
 461
 462     return val&0x01 ? (val+1)/2 : -(val/2);
 463 }
 464
 465
 466 /*****************************************************************************
 467  * ParseNALBlock: parses annexB type NALs
 468  * All p_frag blocks are required to start with 0 0 0 1 4-byte startcode
 469  *****************************************************************************/
 470 static block_t *ParseNALBlock( decoder_t *p_dec, block_t *p_frag )
 471 {
 472     decoder_sys_t *p_sys = p_dec->p_sys;
 473     block_t *p_pic = NULL;
 474
 475     const int i_nal_ref_idc = (p_frag->p_buffer[4] >> 5)&0x03;
 476     const int i_nal_type = p_frag->p_buffer[4]&0x1f;
 477
 478 #define OUTPUT \
 479     do {                                                      \
 480         p_pic = block_ChainGather( p_sys->p_frame );          \
 481         p_pic->i_length = 0;    /* FIXME */                   \
 482         p_pic->i_flags |= p_sys->i_frame_type;                \
 483                                                               \
 484         p_sys->i_frame_type = 0;                              \
 485         p_sys->p_frame = NULL;                                \
 486         p_sys->b_slice = VLC_FALSE;                           \
 487                                                               \
 488         if( ( p_pic->i_flags & BLOCK_FLAG_TYPE_I ) &&         \
 489               p_sys->p_sps && p_sys->p_pps )                  \
 490         {                                                     \
 491             block_t *p_sps = block_Duplicate( p_sys->p_sps ); \
 492             block_t *p_pps = block_Duplicate( p_sys->p_pps ); \
 493             p_sps->i_dts = p_pps->i_dts = p_pic->i_dts;       \
 494             p_sps->i_pts = p_pps->i_pts = p_pic->i_pts;       \
 495             block_ChainAppend( &p_sps, p_pps );               \
 496             block_ChainAppend( &p_sps, p_pic );               \
 497             p_pic = block_ChainGather( p_sps );               \
 498         }                                                     \
 499     } while(0)
 500
 501
 502     if( p_sys->b_slice && !p_sys->b_sps )
 503     {
 504         block_ChainRelease( p_sys->p_frame );
 505         msg_Warn( p_dec, "waiting for SPS" );
 506
 507         /* Reset context */
 508         p_sys->p_frame = NULL;
 509         p_sys->b_slice = VLC_FALSE;
 510     }
 511
 512     if( !p_sys->b_sps &&
 513         i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
 514     {
 515         p_sys->b_slice = VLC_TRUE;
 516         /* Fragment will be discarded later on */
 517     }
 518     else if( i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
 519     {
 520         uint8_t *dec;
 521         int i_dec, i_first_mb, i_slice_type, i_frame_num;
 522         vlc_bool_t b_pic = VLC_FALSE;
 523         bs_t s;
 524
 525         /* do not convert the whole frame */
 526         nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[5],
 527                          __MIN( p_frag->i_buffer - 5, 60 ) );
 528         bs_init( &s, dec, i_dec );
 529
 530         /* first_mb_in_slice */
 531         i_first_mb = bs_read_ue( &s );
 532
 533         /* slice_type */
 534         switch( (i_slice_type = bs_read_ue( &s )) )
 535         {
 536         case 0: case 5:
 537             p_sys->i_frame_type = BLOCK_FLAG_TYPE_P;
 538             break;
 539         case 1: case 6:
 540             p_sys->i_frame_type = BLOCK_FLAG_TYPE_B;
 541             break;
 542         case 2: case 7:
 543             p_sys->i_frame_type = BLOCK_FLAG_TYPE_I;
 544             break;
 545         case 3: case 8: /* SP */
 546             p_sys->i_frame_type = BLOCK_FLAG_TYPE_P;
 547             break;
 548         case 4: case 9:
 549             p_sys->i_frame_type = BLOCK_FLAG_TYPE_I;
 550             break;
 551         }
 552
 553         /* pic_parameter_set_id */
 554         bs_read_ue( &s );
 555         /* frame_num */
 556         i_frame_num = bs_read( &s, p_sys->i_log2_max_frame_num + 4 );
 557
 558         /* Detection of the first VCL NAL unit of a primary coded picture
 559          * (cf. 7.4.1.2.4) */
 560         if( i_frame_num != p_sys->i_frame_num ||
 561             ( (i_nal_ref_idc != p_sys->i_nal_ref_idc) &&
 562               (!i_nal_ref_idc || !p_sys->i_nal_ref_idc) ) )
 563         {
 564             b_pic = VLC_TRUE;
 565         }
 566         p_sys->i_frame_num = i_frame_num;
 567         p_sys->i_nal_ref_idc = i_nal_ref_idc;
 568
 569         if( !p_sys->b_frame_mbs_only )
 570         {
 571             /* field_pic_flag */
 572             if( bs_read( &s, 1 ) )
 573             {
 574                 /* bottom_field_flag */
 575                 bs_read( &s, 1 );
 576             }
 577         }
 578
 579         if( i_nal_type == NAL_SLICE_IDR )
 580         {
 581             /* id_pic_id */
 582             int i_idr_pic_id = bs_read_ue( &s );
 583             if( p_sys->i_nal_type != i_nal_type ) b_pic = VLC_TRUE;
 584             if( p_sys->i_idr_pic_id != i_idr_pic_id ) b_pic = VLC_TRUE;
 585             p_sys->i_idr_pic_id = i_idr_pic_id;
 586         }
 587         p_sys->i_nal_type = i_nal_type;
 588
 589         if( b_pic && p_sys->b_slice ) OUTPUT;
 590
 591         p_sys->b_slice = VLC_TRUE;
 592
 593         free( dec );
 594     }
 595     else if( i_nal_type == NAL_SPS )
 596     {
 597         uint8_t *dec;
 598         int     i_dec;
 599         bs_t s;
 600         int i_tmp;
 601
 602         if( !p_sys->b_sps ) msg_Dbg( p_dec, "found NAL_SPS" );
 603
 604         p_sys->b_sps = VLC_TRUE;
 605
 606         nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[5],
 607                          p_frag->i_buffer - 5 );
 608
 609         bs_init( &s, dec, i_dec );
 610         /* Skip profile(8), constraint_set012, reserver(5), level(8) */
 611         bs_skip( &s, 8 + 1+1+1 + 5 + 8 );
 612         /* sps id */
 613         bs_read_ue( &s );
 614         /* Skip i_log2_max_frame_num */
 615         p_sys->i_log2_max_frame_num = bs_read_ue( &s );
 616         /* Read poc_type */
 617         i_tmp = bs_read_ue( &s );
 618         if( i_tmp == 0 )
 619         {
 620             /* skip i_log2_max_poc_lsb */
 621             bs_read_ue( &s );
 622         }
 623         else if( i_tmp == 1 )
 624         {
 625             int i_cycle;
 626             /* skip b_delta_pic_order_always_zero */
 627             bs_skip( &s, 1 );
 628             /* skip i_offset_for_non_ref_pic */
 629             bs_read_se( &s );
 630             /* skip i_offset_for_top_to_bottom_field */
 631             bs_read_se( &s );
 632             /* read i_num_ref_frames_in_poc_cycle */
 633             i_cycle = bs_read_ue( &s );
 634             if( i_cycle > 256 ) i_cycle = 256;
 635             while( i_cycle > 0 )
 636             {
 637                 /* skip i_offset_for_ref_frame */
 638                 bs_read_se(&s );
 639             }
 640         }
 641         /* i_num_ref_frames */
 642         bs_read_ue( &s );
 643         /* b_gaps_in_frame_num_value_allowed */
 644         bs_skip( &s, 1 );
 645
 646         /* Read size */
 647         p_dec->fmt_out.video.i_width  = 16 * ( bs_read_ue( &s ) + 1 );
 648         p_dec->fmt_out.video.i_height = 16 * ( bs_read_ue( &s ) + 1 );
 649
 650         /* b_frame_mbs_only */
 651         p_sys->b_frame_mbs_only = bs_read( &s, 1 );
 652         if( p_sys->b_frame_mbs_only == 0 )
 653         {
 654             bs_skip( &s, 1 );
 655         }
 656         /* b_direct8x8_inference */
 657         bs_skip( &s, 1 );
 658
 659         /* crop */
 660         i_tmp = bs_read( &s, 1 );
 661         if( i_tmp )
 662         {
 663             /* left */
 664             bs_read_ue( &s );
 665             /* right */
 666             bs_read_ue( &s );
 667             /* top */
 668             bs_read_ue( &s );
 669             /* bottom */
 670             bs_read_ue( &s );
 671         }
 672
 673         /* vui */
 674         i_tmp = bs_read( &s, 1 );
 675         if( i_tmp )
 676         {
 677             /* read the aspect ratio part if any FIXME check it */
 678             i_tmp = bs_read( &s, 1 );
 679             if( i_tmp )
 680             {
 681                 static const struct { int w, h; } sar[14] =
 682                 {
 683                     { 0,   0 }, { 1,   1 }, { 12, 11 }, { 10, 11 },
 684                     { 16, 11 }, { 40, 33 }, { 24, 11 }, { 20, 11 },
 685                     { 32, 11 }, { 80, 33 }, { 18, 11 }, { 15, 11 },
 686                     { 64, 33 }, { 160,99 },
 687                 };
 688                 int i_sar = bs_read( &s, 8 );
 689                 int w, h;
 690
 691                 if( i_sar < 14 )
 692                 {
 693                     w = sar[i_sar].w;
 694                     h = sar[i_sar].h;
 695                 }
 696                 else
 697                 {
 698                     w = bs_read( &s, 16 );
 699                     h = bs_read( &s, 16 );
 700                 }
 701                 if( h != 0 )
 702                     p_dec->fmt_out.video.i_aspect = VOUT_ASPECT_FACTOR * w /
 703                         h * p_dec->fmt_out.video.i_width /
 704                         p_dec->fmt_out.video.i_height;
 705                 else
 706                     p_dec->fmt_out.video.i_aspect = VOUT_ASPECT_FACTOR;
 707             }
 708         }
 709
 710         free( dec );
 711
 712         if( p_sys->b_slice ) OUTPUT;
 713
 714         /* We have a new SPS */
 715         if( p_sys->p_sps ) block_Release( p_sys->p_sps );
 716         p_sys->p_sps = p_frag;
 717
 718         /* Do not append the SPS because we will insert it on keyframes */
 719         return p_pic;
 720     }
 721     else if( i_nal_type == NAL_PPS )
 722     {
 723         bs_t s;
 724         bs_init( &s, &p_frag->p_buffer[5], p_frag->i_buffer - 5 );
 725
 726         if( !p_sys->b_pps ) msg_Dbg( p_dec, "found NAL_PPS" );
 727         p_sys->b_pps = VLC_TRUE;
 728
 729         /* TODO */
 730
 731         if( p_sys->b_slice ) OUTPUT;
 732
 733         /* We have a new PPS */
 734         if( p_sys->p_pps ) block_Release( p_sys->p_pps );
 735         p_sys->p_pps = p_frag;
 736
 737         /* Do not append the PPS because we will insert it on keyframes */
 738         return p_pic;
 739     }
 740     else if( i_nal_type == NAL_AU_DELIMITER ||
 741              i_nal_type == NAL_SEI ||
 742              ( i_nal_type >= 13 && i_nal_type <= 18 ) )
 743     {
 744         if( p_sys->b_slice ) OUTPUT;
 745     }
 746
 747 #undef OUTPUT
 748
 749     /* Append the block */
 750     block_ChainAppend( &p_sys->p_frame, p_frag );
 751
 752     return p_pic;
 753 }