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  *          Derk-Jan Hartman <hartman at videolan dot org>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  25  *****************************************************************************/
  26
  27 /*****************************************************************************
  28  * Preamble
  29  *****************************************************************************/
  30 #include <stdlib.h>                                      /* malloc(), free() */
  31
  32 #include <vlc/vlc.h>
  33 #include <vlc_sout.h>
  34 #include <vlc_codec.h>
  35 #include <vlc_block.h>
  36
  37 #include "vlc_block_helper.h"
  38 #include "vlc_bits.h"
  39
  40 /*****************************************************************************
  41  * Module descriptor
  42  *****************************************************************************/
  43 static int  Open ( vlc_object_t * );
  44 static void Close( vlc_object_t * );
  45
  46 vlc_module_begin();
  47     set_category( CAT_SOUT );
  48     set_subcategory( SUBCAT_SOUT_PACKETIZER );
  49     set_description( _("H.264 video packetizer") );
  50     set_capability( "packetizer", 50 );
  51     set_callbacks( Open, Close );
  52 vlc_module_end();
  53
  54
  55 /****************************************************************************
  56  * Local prototypes
  57  ****************************************************************************/
  58 static block_t *Packetize( decoder_t *, block_t ** );
  59 static block_t *PacketizeAVC1( decoder_t *, block_t ** );
  60
  61 struct decoder_sys_t
  62 {
  63     block_bytestream_t bytestream;
  64
  65     int     i_state;
  66     int     i_offset;
  67     uint8_t startcode[4];
  68
  69     vlc_bool_t b_slice;
  70     block_t    *p_frame;
  71
  72     vlc_bool_t   b_sps;
  73     vlc_bool_t   b_pps;
  74     vlc_bool_t   b_header;
  75
  76     /* avcC data */
  77     int i_avcC_length_size;
  78     block_t *p_sps;
  79     block_t *p_pps;
  80
  81     /* Useful values of the Sequence Parameter Set */
  82     int i_log2_max_frame_num;
  83     int b_frame_mbs_only;
  84
  85     /* Useful values of the Slice Header */
  86     int i_nal_type;
  87     int i_nal_ref_idc;
  88     int i_idr_pic_id;
  89     int i_frame_num;
  90     int i_frame_type;
  91 };
  92
  93 enum
  94 {
  95     STATE_NOSYNC,
  96     STATE_NEXT_SYNC,
  97 };
  98
  99 enum nal_unit_type_e
 100 {
 101     NAL_UNKNOWN = 0,
 102     NAL_SLICE   = 1,
 103     NAL_SLICE_DPA   = 2,
 104     NAL_SLICE_DPB   = 3,
 105     NAL_SLICE_DPC   = 4,
 106     NAL_SLICE_IDR   = 5,    /* ref_idc != 0 */
 107     NAL_SEI         = 6,    /* ref_idc == 0 */
 108     NAL_SPS         = 7,
 109     NAL_PPS         = 8,
 110     NAL_AU_DELIMITER= 9
 111     /* ref_idc == 0 for 6,9,10,11,12 */
 112 };
 113
 114 enum nal_priority_e
 115 {
 116     NAL_PRIORITY_DISPOSABLE = 0,
 117     NAL_PRIORITY_LOW        = 1,
 118     NAL_PRIORITY_HIGH       = 2,
 119     NAL_PRIORITY_HIGHEST    = 3,
 120 };
 121
 122 static block_t *ParseNALBlock( decoder_t *, block_t * );
 123
 124 static block_t *nal_get_annexeb( decoder_t *, uint8_t *p, int );
 125
 126 /*****************************************************************************
 127  * Open: probe the packetizer and return score
 128  * When opening after demux, the packetizer is only loaded AFTER the decoder
 129  * That means that what you set in fmt_out is ignored by the decoder in this special case
 130  *****************************************************************************/
 131 static int Open( vlc_object_t *p_this )
 132 {
 133     decoder_t     *p_dec = (decoder_t*)p_this;
 134     decoder_sys_t *p_sys;
 135
 136     if( p_dec->fmt_in.i_codec != VLC_FOURCC( 'h', '2', '6', '4') &&
 137         p_dec->fmt_in.i_codec != VLC_FOURCC( 'H', '2', '6', '4') &&
 138         p_dec->fmt_in.i_codec != VLC_FOURCC( 'V', 'S', 'S', 'H') &&
 139         p_dec->fmt_in.i_codec != VLC_FOURCC( 'v', 's', 's', 'h') &&
 140         p_dec->fmt_in.i_codec != VLC_FOURCC( 'D', 'A', 'V', 'C') &&
 141         ( p_dec->fmt_in.i_codec != VLC_FOURCC( 'a', 'v', 'c', '1') ||
 142           p_dec->fmt_in.i_extra < 7 ) )
 143     {
 144         return VLC_EGENERIC;
 145     }
 146
 147     /* Allocate the memory needed to store the decoder's structure */
 148     if( ( p_dec->p_sys = p_sys = malloc( sizeof(decoder_sys_t) ) ) == NULL )
 149     {
 150         msg_Err( p_dec, "out of memory" );
 151         return VLC_EGENERIC;
 152     }
 153     p_sys->i_state = STATE_NOSYNC;
 154     p_sys->i_offset = 0;
 155     p_sys->startcode[0] = 0;
 156     p_sys->startcode[1] = 0;
 157     p_sys->startcode[2] = 0;
 158     p_sys->startcode[3] = 1;
 159     p_sys->bytestream = block_BytestreamInit( p_dec );
 160     p_sys->b_slice = VLC_FALSE;
 161     p_sys->p_frame = NULL;
 162     p_sys->b_sps   = VLC_FALSE;
 163     p_sys->b_pps   = VLC_FALSE;
 164     p_sys->p_sps   = 0;
 165     p_sys->p_pps   = 0;
 166     p_sys->b_header= VLC_FALSE;
 167
 168     p_sys->i_nal_type = -1;
 169     p_sys->i_nal_ref_idc = -1;
 170     p_sys->i_idr_pic_id = -1;
 171     p_sys->i_frame_num = -1;
 172     p_sys->i_frame_type = 0;
 173
 174     /* Setup properties */
 175     es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
 176     p_dec->fmt_out.i_codec = VLC_FOURCC( 'h', '2', '6', '4' );
 177
 178     if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'a', 'v', 'c', '1' ) )
 179     {
 180         /* This type of stream is produced by mp4 and matroska
 181          * when we want to store it in another streamformat, you need to convert
 182          * The fmt_in.p_extra should ALWAYS contain the avcC
 183          * The fmt_out.p_extra should contain all the SPS and PPS with 4 byte startcodes */
 184         uint8_t *p = &((uint8_t*)p_dec->fmt_in.p_extra)[4];
 185         int i_sps, i_pps;
 186         int i;
 187
 188         /* Parse avcC */
 189         p_sys->i_avcC_length_size = 1 + ((*p++)&0x03);
 190
 191         /* Read SPS */
 192         i_sps = (*p++)&0x1f;
 193         for( i = 0; i < i_sps; i++ )
 194         {
 195             int i_length = GetWBE( p );
 196             block_t *p_sps = nal_get_annexeb( p_dec, p + 2, i_length );
 197
 198             p_sys->p_sps = block_Duplicate( p_sps );
 199             p_sps->i_pts = p_sps->i_dts = mdate();
 200             ParseNALBlock( p_dec, p_sps );
 201             p += 2 + i_length;
 202         }
 203         /* Read PPS */
 204         i_pps = *p++;
 205         for( i = 0; i < i_pps; i++ )
 206         {
 207             int i_length = GetWBE( p );
 208             block_t *p_pps = nal_get_annexeb( p_dec, p + 2, i_length );
 209
 210             p_sys->p_pps = block_Duplicate( p_pps );
 211             p_pps->i_pts = p_pps->i_dts = mdate();
 212             ParseNALBlock( p_dec, p_pps );
 213             p += 2 + i_length;
 214         }
 215         msg_Dbg( p_dec, "avcC length size=%d, sps=%d, pps=%d",
 216                  p_sys->i_avcC_length_size, i_sps, i_pps );
 217
 218         /* FIXME: FFMPEG isn't happy at all if you leave this */
 219         if( p_dec->fmt_out.i_extra ) free( p_dec->fmt_out.p_extra );
 220         p_dec->fmt_out.i_extra = 0; p_dec->fmt_out.p_extra = NULL;
 221
 222         /* Set the new extradata */
 223         p_dec->fmt_out.i_extra = p_sys->p_pps->i_buffer + p_sys->p_sps->i_buffer;
 224         p_dec->fmt_out.p_extra = (uint8_t*)malloc( p_dec->fmt_out.i_extra );
 225         memcpy( p_dec->fmt_out.p_extra, p_sys->p_sps->p_buffer, p_sys->p_sps->i_buffer);
 226         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);
 227         p_sys->b_header = VLC_TRUE;
 228
 229         /* Set callback */
 230         p_dec->pf_packetize = PacketizeAVC1;
 231     }
 232     else
 233     {
 234         /* This type of stream contains data with 3 of 4 byte startcodes
 235          * The fmt_in.p_extra MAY contain SPS/PPS with 4 byte startcodes
 236          * The fmt_out.p_extra should be the same */
 237
 238         /* Set callback */
 239         p_dec->pf_packetize = Packetize;
 240
 241         /* */
 242         if( p_dec->fmt_in.i_extra > 0 )
 243         {
 244             block_t *p_init = block_New( p_dec, p_dec->fmt_in.i_extra );
 245             block_t *p_pic;
 246
 247             memcpy( p_init->p_buffer, p_dec->fmt_in.p_extra,
 248                     p_dec->fmt_in.i_extra );
 249
 250             while( ( p_pic = Packetize( p_dec, &p_init ) ) )
 251             {
 252                 /* Should not occur because we should only receive SPS/PPS */
 253                 block_Release( p_pic );
 254             }
 255         }
 256     }
 257
 258     return VLC_SUCCESS;
 259 }
 260
 261 /*****************************************************************************
 262  * Close: clean up the packetizer
 263  *****************************************************************************/
 264 static void Close( vlc_object_t *p_this )
 265 {
 266     decoder_t *p_dec = (decoder_t*)p_this;
 267     decoder_sys_t *p_sys = p_dec->p_sys;
 268
 269     if( p_sys->p_frame ) block_ChainRelease( p_sys->p_frame );
 270     if( p_sys->p_sps ) block_Release( p_sys->p_sps );
 271     if( p_sys->p_pps ) block_Release( p_sys->p_pps );
 272     block_BytestreamRelease( &p_sys->bytestream );
 273     free( p_sys );
 274 }
 275
 276 /****************************************************************************
 277  * Packetize: the whole thing
 278  * Search for the startcodes 3 or more bytes
 279  * Feed ParseNALBlock ALWAYS with 4 byte startcode prepended NALs
 280  ****************************************************************************/
 281 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
 282 {
 283     decoder_sys_t *p_sys = p_dec->p_sys;
 284     block_t       *p_pic;
 285
 286     if( !pp_block || !*pp_block ) return NULL;
 287
 288     block_BytestreamPush( &p_sys->bytestream, *pp_block );
 289
 290     for( ;; )
 291     {
 292         switch( p_sys->i_state )
 293         {
 294             case STATE_NOSYNC:
 295                 /* Skip until 3 byte startcode 0 0 1 */
 296                 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
 297                       &p_sys->i_offset, p_sys->startcode+1, 3 ) == VLC_SUCCESS)
 298                 {
 299                     p_sys->i_state = STATE_NEXT_SYNC;
 300                 }
 301
 302                 if( p_sys->i_offset )
 303                 {
 304                     /* skip the data */
 305                     block_SkipBytes( &p_sys->bytestream, p_sys->i_offset );
 306                     p_sys->i_offset = 0;
 307                     block_BytestreamFlush( &p_sys->bytestream );
 308                 }
 309
 310                 if( p_sys->i_state != STATE_NEXT_SYNC )
 311                 {
 312                     /* Need more data */
 313                     return NULL;
 314                 }
 315
 316                 p_sys->i_offset = 1; /* To find next startcode */
 317
 318             case STATE_NEXT_SYNC:
 319                 /* Find the next 3 byte startcode 0 0 1*/
 320                 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
 321                       &p_sys->i_offset, p_sys->startcode+1, 3 ) != VLC_SUCCESS)
 322                 {
 323                     /* Need more data */
 324                     return NULL;
 325                 }
 326
 327                 /* Get the new fragment and set the pts/dts */
 328                 p_pic = block_New( p_dec, p_sys->i_offset +1 );
 329                 p_pic->i_pts = p_sys->bytestream.p_block->i_pts;
 330                 p_pic->i_dts = p_sys->bytestream.p_block->i_dts;
 331                 /* Force 4 byte startcode 0 0 0 1 */
 332                 p_pic->p_buffer[0] = 0;
 333
 334                 block_GetBytes( &p_sys->bytestream, &p_pic->p_buffer[1],
 335                                 p_pic->i_buffer-1 );
 336
 337                 /* Remove trailing 0 bytes */
 338                 while( p_pic->i_buffer && (!p_pic->p_buffer[p_pic->i_buffer-1] ) ) p_pic->i_buffer--;
 339                 p_sys->i_offset = 0;
 340
 341                 /* Parse the NAL */
 342                 if( !( p_pic = ParseNALBlock( p_dec, p_pic ) ) )
 343                 {
 344                     p_sys->i_state = STATE_NOSYNC;
 345                     break;
 346                 }
 347 #if 0
 348                 msg_Dbg( p_dec, "pts="I64Fd" dts="I64Fd,
 349                          p_pic->i_pts, p_pic->i_dts );
 350 #endif
 351
 352                 /* So p_block doesn't get re-added several times */
 353                 *pp_block = block_BytestreamPop( &p_sys->bytestream );
 354
 355                 p_sys->i_state = STATE_NOSYNC;
 356
 357                 return p_pic;
 358         }
 359     }
 360 }
 361
 362 /****************************************************************************
 363  * PacketizeAVC1: Takes VCL blocks of data and creates annexe B type NAL stream
 364  * Will always use 4 byte 0 0 0 1 startcodes
 365  * Will prepend a SPS and PPS before each keyframe
 366  ****************************************************************************/
 367 static block_t *PacketizeAVC1( decoder_t *p_dec, block_t **pp_block )
 368 {
 369     decoder_sys_t *p_sys = p_dec->p_sys;
 370     block_t       *p_block;
 371     block_t       *p_ret = NULL;
 372     uint8_t       *p;
 373
 374     if( !pp_block || !*pp_block ) return NULL;
 375
 376     p_block = *pp_block;
 377     *pp_block = NULL;
 378
 379     for( p = p_block->p_buffer; p < &p_block->p_buffer[p_block->i_buffer]; )
 380     {
 381         block_t *p_pic;
 382         int i_size = 0;
 383         int i;
 384
 385         for( i = 0; i < p_sys->i_avcC_length_size; i++ )
 386         {
 387             i_size = (i_size << 8) | (*p++);
 388         }
 389
 390         if( i_size > 0 )
 391         {
 392             block_t *p_part = nal_get_annexeb( p_dec, p, i_size );
 393
 394             p_part->i_dts = p_block->i_dts;
 395             p_part->i_pts = p_block->i_pts;
 396
 397             /* Parse the NAL */
 398             if( ( p_pic = ParseNALBlock( p_dec, p_part ) ) )
 399             {
 400                 block_ChainAppend( &p_ret, p_pic );
 401             }
 402         }
 403         p += i_size;
 404     }
 405     block_Release( p_block );
 406
 407     return p_ret;
 408 }
 409
 410 static block_t *nal_get_annexeb( decoder_t *p_dec, uint8_t *p, int i_size )
 411 {
 412     block_t *p_nal;
 413
 414     p_nal = block_New( p_dec, 4 + i_size );
 415
 416     /* Add start code */
 417     p_nal->p_buffer[0] = 0x00;
 418     p_nal->p_buffer[1] = 0x00;
 419     p_nal->p_buffer[2] = 0x00;
 420     p_nal->p_buffer[3] = 0x01;
 421
 422     /* Copy nalu */
 423     memcpy( &p_nal->p_buffer[4], p, i_size );
 424
 425     return p_nal;
 426 }
 427
 428 static void nal_get_decoded( uint8_t **pp_ret, int *pi_ret,
 429                              uint8_t *src, int i_src )
 430 {
 431     uint8_t *end = &src[i_src];
 432     uint8_t *dst = malloc( i_src );
 433
 434     *pp_ret = dst;
 435
 436     while( src < end )
 437     {
 438         if( src < end - 3 && src[0] == 0x00 && src[1] == 0x00 &&
 439             src[2] == 0x03 )
 440         {
 441             *dst++ = 0x00;
 442             *dst++ = 0x00;
 443
 444             src += 3;
 445             continue;
 446         }
 447         *dst++ = *src++;
 448     }
 449
 450     *pi_ret = dst - *pp_ret;
 451 }
 452
 453 static inline int bs_read_ue( bs_t *s )
 454 {
 455     int i = 0;
 456
 457     while( bs_read1( s ) == 0 && s->p < s->p_end && i < 32 )
 458     {
 459         i++;
 460     }
 461     return( ( 1 << i) - 1 + bs_read( s, i ) );
 462 }
 463
 464 static inline int bs_read_se( bs_t *s )
 465 {
 466     int val = bs_read_ue( s );
 467
 468     return val&0x01 ? (val+1)/2 : -(val/2);
 469 }
 470
 471
 472 /*****************************************************************************
 473  * ParseNALBlock: parses annexB type NALs
 474  * All p_frag blocks are required to start with 0 0 0 1 4-byte startcode
 475  *****************************************************************************/
 476 static block_t *ParseNALBlock( decoder_t *p_dec, block_t *p_frag )
 477 {
 478     decoder_sys_t *p_sys = p_dec->p_sys;
 479     block_t *p_pic = NULL;
 480
 481     const int i_nal_ref_idc = (p_frag->p_buffer[4] >> 5)&0x03;
 482     const int i_nal_type = p_frag->p_buffer[4]&0x1f;
 483
 484 #define OUTPUT \
 485     do {                                                      \
 486         if( !p_sys->b_header && p_sys->i_frame_type != BLOCK_FLAG_TYPE_I) \
 487             break;                                            \
 488                                                               \
 489         p_pic = block_ChainGather( p_sys->p_frame );          \
 490         p_pic->i_length = 0;    /* FIXME */                   \
 491         p_pic->i_flags |= p_sys->i_frame_type;                \
 492                                                               \
 493         p_sys->i_frame_type = 0;                              \
 494         p_sys->p_frame = NULL;                                \
 495         p_sys->b_slice = VLC_FALSE;                           \
 496                                                               \
 497         if( ( p_pic->i_flags & BLOCK_FLAG_TYPE_I ) &&         \
 498               p_sys->p_sps && p_sys->p_pps )                  \
 499         {                                                     \
 500             block_t *p_sps = block_Duplicate( p_sys->p_sps ); \
 501             block_t *p_pps = block_Duplicate( p_sys->p_pps ); \
 502             p_sps->i_dts = p_pps->i_dts = p_pic->i_dts;       \
 503             p_sps->i_pts = p_pps->i_pts = p_pic->i_pts;       \
 504             block_ChainAppend( &p_sps, p_pps );               \
 505             block_ChainAppend( &p_sps, p_pic );               \
 506             p_pic = p_sps;                                    \
 507             p_sys->b_header = VLC_TRUE;                       \
 508         }                                                     \
 509     } while(0)
 510
 511
 512     if( p_sys->b_slice && !p_sys->b_sps )
 513     {
 514         block_ChainRelease( p_sys->p_frame );
 515         msg_Warn( p_dec, "waiting for SPS" );
 516
 517         /* Reset context */
 518         p_sys->p_frame = NULL;
 519         p_sys->b_slice = VLC_FALSE;
 520     }
 521
 522     if( !p_sys->b_sps &&
 523         i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
 524     {
 525         p_sys->b_slice = VLC_TRUE;
 526         /* Fragment will be discarded later on */
 527     }
 528     else if( i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
 529     {
 530         uint8_t *dec;
 531         int i_dec, i_first_mb, i_slice_type, i_frame_num;
 532         vlc_bool_t b_pic = VLC_FALSE;
 533         bs_t s;
 534
 535         /* do not convert the whole frame */
 536         nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[5],
 537                          __MIN( p_frag->i_buffer - 5, 60 ) );
 538         bs_init( &s, dec, i_dec );
 539
 540         /* first_mb_in_slice */
 541         i_first_mb = bs_read_ue( &s );
 542
 543         /* slice_type */
 544         switch( (i_slice_type = bs_read_ue( &s )) )
 545         {
 546         case 0: case 5:
 547             p_sys->i_frame_type = BLOCK_FLAG_TYPE_P;
 548             break;
 549         case 1: case 6:
 550             p_sys->i_frame_type = BLOCK_FLAG_TYPE_B;
 551             break;
 552         case 2: case 7:
 553             p_sys->i_frame_type = BLOCK_FLAG_TYPE_I;
 554             break;
 555         case 3: case 8: /* SP */
 556             p_sys->i_frame_type = BLOCK_FLAG_TYPE_P;
 557             break;
 558         case 4: case 9:
 559             p_sys->i_frame_type = BLOCK_FLAG_TYPE_I;
 560             break;
 561         }
 562
 563         /* pic_parameter_set_id */
 564         bs_read_ue( &s );
 565         /* frame_num */
 566         i_frame_num = bs_read( &s, p_sys->i_log2_max_frame_num + 4 );
 567
 568         /* Detection of the first VCL NAL unit of a primary coded picture
 569          * (cf. 7.4.1.2.4) */
 570         if( i_frame_num != p_sys->i_frame_num ||
 571             ( (i_nal_ref_idc != p_sys->i_nal_ref_idc) &&
 572               (!i_nal_ref_idc || !p_sys->i_nal_ref_idc) ) )
 573         {
 574             b_pic = VLC_TRUE;
 575         }
 576         p_sys->i_frame_num = i_frame_num;
 577         p_sys->i_nal_ref_idc = i_nal_ref_idc;
 578
 579         if( !p_sys->b_frame_mbs_only )
 580         {
 581             /* field_pic_flag */
 582             if( bs_read( &s, 1 ) )
 583             {
 584                 /* bottom_field_flag */
 585                 bs_read( &s, 1 );
 586             }
 587         }
 588
 589         if( i_nal_type == NAL_SLICE_IDR )
 590         {
 591             /* id_pic_id */
 592             int i_idr_pic_id = bs_read_ue( &s );
 593             if( p_sys->i_nal_type != i_nal_type ) b_pic = VLC_TRUE;
 594             if( p_sys->i_idr_pic_id != i_idr_pic_id ) b_pic = VLC_TRUE;
 595             p_sys->i_idr_pic_id = i_idr_pic_id;
 596         }
 597         p_sys->i_nal_type = i_nal_type;
 598
 599         if( b_pic && p_sys->b_slice ) OUTPUT;
 600
 601         p_sys->b_slice = VLC_TRUE;
 602
 603         free( dec );
 604     }
 605     else if( i_nal_type == NAL_SPS )
 606     {
 607         uint8_t *dec;
 608         int     i_dec;
 609         bs_t s;
 610         int i_tmp;
 611
 612         if( !p_sys->b_sps ) msg_Dbg( p_dec, "found NAL_SPS" );
 613
 614         p_sys->b_sps = VLC_TRUE;
 615
 616         nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[5],
 617                          p_frag->i_buffer - 5 );
 618
 619         bs_init( &s, dec, i_dec );
 620         /* Skip profile(8), constraint_set012, reserver(5), level(8) */
 621         bs_skip( &s, 8 + 1+1+1 + 5 + 8 );
 622         /* sps id */
 623         bs_read_ue( &s );
 624         /* Skip i_log2_max_frame_num */
 625         p_sys->i_log2_max_frame_num = bs_read_ue( &s );
 626         /* Read poc_type */
 627         i_tmp = bs_read_ue( &s );
 628         if( i_tmp == 0 )
 629         {
 630             /* skip i_log2_max_poc_lsb */
 631             bs_read_ue( &s );
 632         }
 633         else if( i_tmp == 1 )
 634         {
 635             int i_cycle;
 636             /* skip b_delta_pic_order_always_zero */
 637             bs_skip( &s, 1 );
 638             /* skip i_offset_for_non_ref_pic */
 639             bs_read_se( &s );
 640             /* skip i_offset_for_top_to_bottom_field */
 641             bs_read_se( &s );
 642             /* read i_num_ref_frames_in_poc_cycle */
 643             i_cycle = bs_read_ue( &s );
 644             if( i_cycle > 256 ) i_cycle = 256;
 645             while( i_cycle > 0 )
 646             {
 647                 /* skip i_offset_for_ref_frame */
 648                 bs_read_se(&s );
 649             }
 650         }
 651         /* i_num_ref_frames */
 652         bs_read_ue( &s );
 653         /* b_gaps_in_frame_num_value_allowed */
 654         bs_skip( &s, 1 );
 655
 656         /* Read size */
 657         p_dec->fmt_out.video.i_width  = 16 * ( bs_read_ue( &s ) + 1 );
 658         p_dec->fmt_out.video.i_height = 16 * ( bs_read_ue( &s ) + 1 );
 659
 660         /* b_frame_mbs_only */
 661         p_sys->b_frame_mbs_only = bs_read( &s, 1 );
 662         if( p_sys->b_frame_mbs_only == 0 )
 663         {
 664             bs_skip( &s, 1 );
 665         }
 666         /* b_direct8x8_inference */
 667         bs_skip( &s, 1 );
 668
 669         /* crop */
 670         i_tmp = bs_read( &s, 1 );
 671         if( i_tmp )
 672         {
 673             /* left */
 674             bs_read_ue( &s );
 675             /* right */
 676             bs_read_ue( &s );
 677             /* top */
 678             bs_read_ue( &s );
 679             /* bottom */
 680             bs_read_ue( &s );
 681         }
 682
 683         /* vui */
 684         i_tmp = bs_read( &s, 1 );
 685         if( i_tmp )
 686         {
 687             /* read the aspect ratio part if any FIXME check it */
 688             i_tmp = bs_read( &s, 1 );
 689             if( i_tmp )
 690             {
 691                 static const struct { int w, h; } sar[14] =
 692                 {
 693                     { 0,   0 }, { 1,   1 }, { 12, 11 }, { 10, 11 },
 694                     { 16, 11 }, { 40, 33 }, { 24, 11 }, { 20, 11 },
 695                     { 32, 11 }, { 80, 33 }, { 18, 11 }, { 15, 11 },
 696                     { 64, 33 }, { 160,99 },
 697                 };
 698                 int i_sar = bs_read( &s, 8 );
 699                 int w, h;
 700
 701                 if( i_sar < 14 )
 702                 {
 703                     w = sar[i_sar].w;
 704                     h = sar[i_sar].h;
 705                 }
 706                 else
 707                 {
 708                     w = bs_read( &s, 16 );
 709                     h = bs_read( &s, 16 );
 710                 }
 711                 if( h != 0 )
 712                     p_dec->fmt_out.video.i_aspect = VOUT_ASPECT_FACTOR * w /
 713                         h * p_dec->fmt_out.video.i_width /
 714                         p_dec->fmt_out.video.i_height;
 715                 else
 716                     p_dec->fmt_out.video.i_aspect = VOUT_ASPECT_FACTOR;
 717             }
 718         }
 719
 720         free( dec );
 721
 722         if( p_sys->b_slice ) OUTPUT;
 723
 724         /* We have a new SPS */
 725         if( p_sys->p_sps ) block_Release( p_sys->p_sps );
 726         p_sys->p_sps = p_frag;
 727
 728         /* Do not append the SPS because we will insert it on keyframes */
 729         return p_pic;
 730     }
 731     else if( i_nal_type == NAL_PPS )
 732     {
 733         bs_t s;
 734         bs_init( &s, &p_frag->p_buffer[5], p_frag->i_buffer - 5 );
 735
 736         if( !p_sys->b_pps ) msg_Dbg( p_dec, "found NAL_PPS" );
 737         p_sys->b_pps = VLC_TRUE;
 738
 739         /* TODO */
 740
 741         if( p_sys->b_slice ) OUTPUT;
 742
 743         /* We have a new PPS */
 744         if( p_sys->p_pps ) block_Release( p_sys->p_pps );
 745         p_sys->p_pps = p_frag;
 746
 747         /* Do not append the PPS because we will insert it on keyframes */
 748         return p_pic;
 749     }
 750     else if( i_nal_type == NAL_AU_DELIMITER ||
 751              i_nal_type == NAL_SEI ||
 752              ( i_nal_type >= 13 && i_nal_type <= 18 ) )
 753     {
 754         if( p_sys->b_slice ) OUTPUT;
 755     }
 756
 757 #undef OUTPUT
 758
 759     /* Append the block */
 760     block_ChainAppend( &p_sys->p_frame, p_frag );
 761
 762     return p_pic;
 763 }