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
  31 #include <vlc/vlc.h>
  32 #include <vlc_sout.h>
  33 #include <vlc_codec.h>
  34 #include <vlc_block.h>
  35
  36 #include "vlc_block_helper.h"
  37 #include "vlc_bits.h"
  38
  39 /*****************************************************************************
  40  * Module descriptor
  41  *****************************************************************************/
  42 static int  Open ( vlc_object_t * );
  43 static void Close( vlc_object_t * );
  44
  45 vlc_module_begin();
  46     set_category( CAT_SOUT );
  47     set_subcategory( SUBCAT_SOUT_PACKETIZER );
  48     set_description( _("H.264 video packetizer") );
  49     set_capability( "packetizer", 50 );
  50     set_callbacks( Open, Close );
  51 vlc_module_end();
  52
  53
  54 /****************************************************************************
  55  * Local prototypes
  56  ****************************************************************************/
  57 static block_t *Packetize( decoder_t *, block_t ** );
  58 static block_t *PacketizeAVC1( decoder_t *, block_t ** );
  59
  60 typedef struct
  61 {
  62     int i_nal_type;
  63     int i_nal_ref_idc;
  64
  65     int i_frame_type;
  66     int i_pic_parameter_set_id;
  67     int i_frame_num;
  68
  69     int i_field_pic_flag;
  70     int i_bottom_field_flag;
  71
  72     int i_idr_pic_id;
  73
  74     int i_pic_order_cnt_lsb;
  75     int i_delta_pic_order_cnt_bottom;
  76
  77     int i_delta_pic_order_cnt0;
  78     int i_delta_pic_order_cnt1;
  79 } slice_t;
  80
  81 struct decoder_sys_t
  82 {
  83     block_bytestream_t bytestream;
  84
  85     int     i_state;
  86     int     i_offset;
  87     uint8_t startcode[4];
  88
  89     vlc_bool_t b_slice;
  90     block_t    *p_frame;
  91
  92     vlc_bool_t   b_sps;
  93     vlc_bool_t   b_pps;
  94     vlc_bool_t   b_header;
  95
  96     /* avcC data */
  97     int i_avcC_length_size;
  98     block_t *p_sps;
  99     block_t *p_pps;
 100
 101     /* Useful values of the Sequence Parameter Set */
 102     int i_log2_max_frame_num;
 103     int b_frame_mbs_only;
 104     int i_pic_order_cnt_type;
 105     int i_delta_pic_order_always_zero_flag;
 106     int i_log2_max_pic_order_cnt_lsb;
 107
 108     /* Value from Picture Parameter Set */
 109     int i_pic_order_present_flag;
 110
 111     /* Useful values of the Slice Header */
 112     slice_t slice;
 113 };
 114
 115 enum
 116 {
 117     STATE_NOSYNC,
 118     STATE_NEXT_SYNC,
 119 };
 120
 121 enum nal_unit_type_e
 122 {
 123     NAL_UNKNOWN = 0,
 124     NAL_SLICE   = 1,
 125     NAL_SLICE_DPA   = 2,
 126     NAL_SLICE_DPB   = 3,
 127     NAL_SLICE_DPC   = 4,
 128     NAL_SLICE_IDR   = 5,    /* ref_idc != 0 */
 129     NAL_SEI         = 6,    /* ref_idc == 0 */
 130     NAL_SPS         = 7,
 131     NAL_PPS         = 8,
 132     NAL_AU_DELIMITER= 9
 133     /* ref_idc == 0 for 6,9,10,11,12 */
 134 };
 135
 136 enum nal_priority_e
 137 {
 138     NAL_PRIORITY_DISPOSABLE = 0,
 139     NAL_PRIORITY_LOW        = 1,
 140     NAL_PRIORITY_HIGH       = 2,
 141     NAL_PRIORITY_HIGHEST    = 3,
 142 };
 143
 144 static block_t *ParseNALBlock( decoder_t *, block_t * );
 145
 146 static block_t *nal_get_annexeb( decoder_t *, uint8_t *p, int );
 147
 148 /*****************************************************************************
 149  * Open: probe the packetizer and return score
 150  * When opening after demux, the packetizer is only loaded AFTER the decoder
 151  * That means that what you set in fmt_out is ignored by the decoder in this special case
 152  *****************************************************************************/
 153 static int Open( vlc_object_t *p_this )
 154 {
 155     decoder_t     *p_dec = (decoder_t*)p_this;
 156     decoder_sys_t *p_sys;
 157
 158     if( p_dec->fmt_in.i_codec != VLC_FOURCC( 'h', '2', '6', '4') &&
 159         p_dec->fmt_in.i_codec != VLC_FOURCC( 'H', '2', '6', '4') &&
 160         p_dec->fmt_in.i_codec != VLC_FOURCC( 'V', 'S', 'S', 'H') &&
 161         p_dec->fmt_in.i_codec != VLC_FOURCC( 'v', 's', 's', 'h') &&
 162         p_dec->fmt_in.i_codec != VLC_FOURCC( 'D', 'A', 'V', 'C') &&
 163         ( p_dec->fmt_in.i_codec != VLC_FOURCC( 'a', 'v', 'c', '1') ||
 164           p_dec->fmt_in.i_extra < 7 ) )
 165     {
 166         return VLC_EGENERIC;
 167     }
 168
 169     /* Allocate the memory needed to store the decoder's structure */
 170     if( ( p_dec->p_sys = p_sys = malloc( sizeof(decoder_sys_t) ) ) == NULL )
 171     {
 172         msg_Err( p_dec, "out of memory" );
 173         return VLC_EGENERIC;
 174     }
 175     p_sys->i_state = STATE_NOSYNC;
 176     p_sys->i_offset = 0;
 177     p_sys->startcode[0] = 0;
 178     p_sys->startcode[1] = 0;
 179     p_sys->startcode[2] = 0;
 180     p_sys->startcode[3] = 1;
 181     p_sys->bytestream = block_BytestreamInit( p_dec );
 182     p_sys->b_slice = VLC_FALSE;
 183     p_sys->p_frame = NULL;
 184     p_sys->b_sps   = VLC_FALSE;
 185     p_sys->b_pps   = VLC_FALSE;
 186     p_sys->p_sps   = 0;
 187     p_sys->p_pps   = 0;
 188     p_sys->b_header= VLC_FALSE;
 189
 190     p_sys->slice.i_nal_type = -1;
 191     p_sys->slice.i_nal_ref_idc = -1;
 192     p_sys->slice.i_idr_pic_id = -1;
 193     p_sys->slice.i_frame_num = -1;
 194     p_sys->slice.i_frame_type = 0;
 195     p_sys->slice.i_pic_parameter_set_id = -1;
 196     p_sys->slice.i_field_pic_flag = 0;
 197     p_sys->slice.i_bottom_field_flag = -1;
 198     p_sys->slice.i_pic_order_cnt_lsb = -1;
 199     p_sys->slice.i_delta_pic_order_cnt_bottom = -1;
 200
 201     /* Setup properties */
 202     es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
 203     p_dec->fmt_out.i_codec = VLC_FOURCC( 'h', '2', '6', '4' );
 204
 205     if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'a', 'v', 'c', '1' ) )
 206     {
 207         /* This type of stream is produced by mp4 and matroska
 208          * when we want to store it in another streamformat, you need to convert
 209          * The fmt_in.p_extra should ALWAYS contain the avcC
 210          * The fmt_out.p_extra should contain all the SPS and PPS with 4 byte startcodes */
 211         uint8_t *p = &((uint8_t*)p_dec->fmt_in.p_extra)[4];
 212         int i_sps, i_pps;
 213         int i;
 214
 215         /* Parse avcC */
 216         p_sys->i_avcC_length_size = 1 + ((*p++)&0x03);
 217
 218         /* Read SPS */
 219         i_sps = (*p++)&0x1f;
 220         for( i = 0; i < i_sps; i++ )
 221         {
 222             int i_length = GetWBE( p );
 223             block_t *p_sps = nal_get_annexeb( p_dec, p + 2, i_length );
 224
 225             p_sys->p_sps = block_Duplicate( p_sps );
 226             p_sps->i_pts = p_sps->i_dts = mdate();
 227             ParseNALBlock( p_dec, p_sps );
 228             p += 2 + i_length;
 229         }
 230         /* Read PPS */
 231         i_pps = *p++;
 232         for( i = 0; i < i_pps; i++ )
 233         {
 234             int i_length = GetWBE( p );
 235             block_t *p_pps = nal_get_annexeb( p_dec, p + 2, i_length );
 236
 237             p_sys->p_pps = block_Duplicate( p_pps );
 238             p_pps->i_pts = p_pps->i_dts = mdate();
 239             ParseNALBlock( p_dec, p_pps );
 240             p += 2 + i_length;
 241         }
 242         msg_Dbg( p_dec, "avcC length size=%d, sps=%d, pps=%d",
 243                  p_sys->i_avcC_length_size, i_sps, i_pps );
 244
 245         /* FIXME: FFMPEG isn't happy at all if you leave this */
 246         if( p_dec->fmt_out.i_extra ) free( p_dec->fmt_out.p_extra );
 247         p_dec->fmt_out.i_extra = 0; p_dec->fmt_out.p_extra = NULL;
 248
 249         /* Set the new extradata */
 250         p_dec->fmt_out.i_extra = p_sys->p_pps->i_buffer + p_sys->p_sps->i_buffer;
 251         p_dec->fmt_out.p_extra = (uint8_t*)malloc( p_dec->fmt_out.i_extra );
 252         memcpy( (uint8_t*)p_dec->fmt_out.p_extra, p_sys->p_sps->p_buffer, p_sys->p_sps->i_buffer);
 253         memcpy( (uint8_t*)p_dec->fmt_out.p_extra+p_sys->p_sps->i_buffer, p_sys->p_pps->p_buffer, p_sys->p_pps->i_buffer);
 254         p_sys->b_header = VLC_TRUE;
 255
 256         /* Set callback */
 257         p_dec->pf_packetize = PacketizeAVC1;
 258     }
 259     else
 260     {
 261         /* This type of stream contains data with 3 of 4 byte startcodes
 262          * The fmt_in.p_extra MAY contain SPS/PPS with 4 byte startcodes
 263          * The fmt_out.p_extra should be the same */
 264
 265         /* Set callback */
 266         p_dec->pf_packetize = Packetize;
 267
 268         /* */
 269         if( p_dec->fmt_in.i_extra > 0 )
 270         {
 271             block_t *p_init = block_New( p_dec, p_dec->fmt_in.i_extra );
 272             block_t *p_pic;
 273
 274             memcpy( p_init->p_buffer, p_dec->fmt_in.p_extra,
 275                     p_dec->fmt_in.i_extra );
 276
 277             while( ( p_pic = Packetize( p_dec, &p_init ) ) )
 278             {
 279                 /* Should not occur because we should only receive SPS/PPS */
 280                 block_Release( p_pic );
 281             }
 282         }
 283     }
 284
 285     return VLC_SUCCESS;
 286 }
 287
 288 /*****************************************************************************
 289  * Close: clean up the packetizer
 290  *****************************************************************************/
 291 static void Close( vlc_object_t *p_this )
 292 {
 293     decoder_t *p_dec = (decoder_t*)p_this;
 294     decoder_sys_t *p_sys = p_dec->p_sys;
 295
 296     if( p_sys->p_frame ) block_ChainRelease( p_sys->p_frame );
 297     if( p_sys->p_sps ) block_Release( p_sys->p_sps );
 298     if( p_sys->p_pps ) block_Release( p_sys->p_pps );
 299     block_BytestreamRelease( &p_sys->bytestream );
 300     free( p_sys );
 301 }
 302
 303 /****************************************************************************
 304  * Packetize: the whole thing
 305  * Search for the startcodes 3 or more bytes
 306  * Feed ParseNALBlock ALWAYS with 4 byte startcode prepended NALs
 307  ****************************************************************************/
 308 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
 309 {
 310     decoder_sys_t *p_sys = p_dec->p_sys;
 311     block_t       *p_pic;
 312
 313     if( !pp_block || !*pp_block )
 314         return NULL;
 315
 316     if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
 317     {
 318         if( (*pp_block)->i_flags&BLOCK_FLAG_CORRUPTED )
 319         {
 320             p_sys->i_state = STATE_NOSYNC;
 321             block_BytestreamFlush( &p_sys->bytestream );
 322
 323             if( p_sys->p_frame )
 324                 block_ChainRelease( p_sys->p_frame );
 325             p_sys->p_frame = NULL;
 326             p_sys->slice.i_frame_type = 0;
 327             p_sys->b_slice = VLC_FALSE;
 328         }
 329         block_Release( *pp_block );
 330         return NULL;
 331     }
 332
 333     block_BytestreamPush( &p_sys->bytestream, *pp_block );
 334
 335     for( ;; )
 336     {
 337         switch( p_sys->i_state )
 338         {
 339             case STATE_NOSYNC:
 340                 /* Skip until 3 byte startcode 0 0 1 */
 341                 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
 342                       &p_sys->i_offset, p_sys->startcode+1, 3 ) == VLC_SUCCESS)
 343                 {
 344                     p_sys->i_state = STATE_NEXT_SYNC;
 345                 }
 346
 347                 if( p_sys->i_offset )
 348                 {
 349                     /* skip the data */
 350                     block_SkipBytes( &p_sys->bytestream, p_sys->i_offset );
 351                     p_sys->i_offset = 0;
 352                     block_BytestreamFlush( &p_sys->bytestream );
 353                 }
 354
 355                 if( p_sys->i_state != STATE_NEXT_SYNC )
 356                 {
 357                     /* Need more data */
 358                     return NULL;
 359                 }
 360
 361                 p_sys->i_offset = 1; /* To find next startcode */
 362
 363             case STATE_NEXT_SYNC:
 364                 /* Find the next 3 byte startcode 0 0 1*/
 365                 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
 366                       &p_sys->i_offset, p_sys->startcode+1, 3 ) != VLC_SUCCESS)
 367                 {
 368                     /* Need more data */
 369                     return NULL;
 370                 }
 371
 372                 /* Get the new fragment and set the pts/dts */
 373                 p_pic = block_New( p_dec, p_sys->i_offset +1 );
 374                 p_pic->i_pts = p_sys->bytestream.p_block->i_pts;
 375                 p_pic->i_dts = p_sys->bytestream.p_block->i_dts;
 376                 /* Force 4 byte startcode 0 0 0 1 */
 377                 p_pic->p_buffer[0] = 0;
 378
 379                 block_GetBytes( &p_sys->bytestream, &p_pic->p_buffer[1],
 380                                 p_pic->i_buffer-1 );
 381
 382                 /* Remove trailing 0 bytes */
 383                 while( p_pic->i_buffer && (!p_pic->p_buffer[p_pic->i_buffer-1] ) )
 384                     p_pic->i_buffer--;
 385                 p_sys->i_offset = 0;
 386
 387                 /* Parse the NAL */
 388                 if( !( p_pic = ParseNALBlock( p_dec, p_pic ) ) )
 389                 {
 390                     p_sys->i_state = STATE_NOSYNC;
 391                     break;
 392                 }
 393 #if 0
 394                 msg_Dbg( p_dec, "pts="I64Fd" dts="I64Fd,
 395                          p_pic->i_pts, p_pic->i_dts );
 396 #endif
 397
 398                 /* So p_block doesn't get re-added several times */
 399                 *pp_block = block_BytestreamPop( &p_sys->bytestream );
 400
 401                 p_sys->i_state = STATE_NOSYNC;
 402
 403                 return p_pic;
 404         }
 405     }
 406 }
 407
 408 /****************************************************************************
 409  * PacketizeAVC1: Takes VCL blocks of data and creates annexe B type NAL stream
 410  * Will always use 4 byte 0 0 0 1 startcodes
 411  * Will prepend a SPS and PPS before each keyframe
 412  ****************************************************************************/
 413 static block_t *PacketizeAVC1( decoder_t *p_dec, block_t **pp_block )
 414 {
 415     decoder_sys_t *p_sys = p_dec->p_sys;
 416     block_t       *p_block;
 417     block_t       *p_ret = NULL;
 418     uint8_t       *p;
 419
 420     if( !pp_block || !*pp_block )
 421         return NULL;
 422     if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
 423     {
 424         block_Release( *pp_block );
 425         return NULL;
 426     }
 427
 428     p_block = *pp_block;
 429     *pp_block = NULL;
 430
 431     for( p = p_block->p_buffer; p < &p_block->p_buffer[p_block->i_buffer]; )
 432     {
 433         block_t *p_pic;
 434         int i_size = 0;
 435         int i;
 436
 437         for( i = 0; i < p_sys->i_avcC_length_size; i++ )
 438         {
 439             i_size = (i_size << 8) | (*p++);
 440         }
 441
 442         if( i_size > 0 )
 443         {
 444             block_t *p_part = nal_get_annexeb( p_dec, p, i_size );
 445
 446             p_part->i_dts = p_block->i_dts;
 447             p_part->i_pts = p_block->i_pts;
 448
 449             /* Parse the NAL */
 450             if( ( p_pic = ParseNALBlock( p_dec, p_part ) ) )
 451             {
 452                 block_ChainAppend( &p_ret, p_pic );
 453             }
 454         }
 455         p += i_size;
 456     }
 457     block_Release( p_block );
 458
 459     return p_ret;
 460 }
 461
 462 static block_t *nal_get_annexeb( decoder_t *p_dec, uint8_t *p, int i_size )
 463 {
 464     block_t *p_nal;
 465
 466     p_nal = block_New( p_dec, 4 + i_size );
 467
 468     /* Add start code */
 469     p_nal->p_buffer[0] = 0x00;
 470     p_nal->p_buffer[1] = 0x00;
 471     p_nal->p_buffer[2] = 0x00;
 472     p_nal->p_buffer[3] = 0x01;
 473
 474     /* Copy nalu */
 475     memcpy( &p_nal->p_buffer[4], p, i_size );
 476
 477     return p_nal;
 478 }
 479
 480 static void nal_get_decoded( uint8_t **pp_ret, int *pi_ret,
 481                              uint8_t *src, int i_src )
 482 {
 483     uint8_t *end = &src[i_src];
 484     uint8_t *dst = malloc( i_src );
 485
 486     *pp_ret = dst;
 487
 488     while( src < end )
 489     {
 490         if( src < end - 3 && src[0] == 0x00 && src[1] == 0x00 &&
 491             src[2] == 0x03 )
 492         {
 493             *dst++ = 0x00;
 494             *dst++ = 0x00;
 495
 496             src += 3;
 497             continue;
 498         }
 499         *dst++ = *src++;
 500     }
 501
 502     *pi_ret = dst - *pp_ret;
 503 }
 504
 505 static inline int bs_read_ue( bs_t *s )
 506 {
 507     int i = 0;
 508
 509     while( bs_read1( s ) == 0 && s->p < s->p_end && i < 32 )
 510     {
 511         i++;
 512     }
 513     return( ( 1 << i) - 1 + bs_read( s, i ) );
 514 }
 515
 516 static inline int bs_read_se( bs_t *s )
 517 {
 518     int val = bs_read_ue( s );
 519
 520     return val&0x01 ? (val+1)/2 : -(val/2);
 521 }
 522
 523
 524 /*****************************************************************************
 525  * ParseNALBlock: parses annexB type NALs
 526  * All p_frag blocks are required to start with 0 0 0 1 4-byte startcode
 527  *****************************************************************************/
 528 static block_t *ParseNALBlock( decoder_t *p_dec, block_t *p_frag )
 529 {
 530     decoder_sys_t *p_sys = p_dec->p_sys;
 531     block_t *p_pic = NULL;
 532
 533     const int i_nal_ref_idc = (p_frag->p_buffer[4] >> 5)&0x03;
 534     const int i_nal_type = p_frag->p_buffer[4]&0x1f;
 535
 536 #define OUTPUT \
 537     do {                                                      \
 538         if( !p_sys->b_header && p_sys->slice.i_frame_type != BLOCK_FLAG_TYPE_I) \
 539             break;                                            \
 540                                                               \
 541         if( p_sys->slice.i_frame_type == BLOCK_FLAG_TYPE_I && p_sys->p_sps && p_sys->p_pps && !p_sys->b_header ) \
 542         { \
 543             block_t *p_sps = block_Duplicate( p_sys->p_sps ); \
 544             block_t *p_pps = block_Duplicate( p_sys->p_pps ); \
 545             p_sps->i_dts = p_sys->p_frame->i_dts;           \
 546             p_sps->i_pts = p_sys->p_frame->i_pts;           \
 547             block_ChainAppend( &p_sps, p_pps );               \
 548             block_ChainAppend( &p_sps, p_sys->p_frame );      \
 549             p_sys->b_header = VLC_TRUE;                       \
 550             p_pic = block_ChainGather( p_sps );               \
 551         } else { \
 552             p_pic = block_ChainGather( p_sys->p_frame ); \
 553         } \
 554         p_pic->i_length = 0;    /* FIXME */                   \
 555         p_pic->i_flags |= p_sys->slice.i_frame_type;          \
 556             \
 557         p_sys->slice.i_frame_type = 0;                        \
 558         p_sys->p_frame = NULL;                                \
 559         p_sys->b_slice = VLC_FALSE;                           \
 560     } while(0)
 561
 562     if( p_sys->b_slice && ( !p_sys->b_sps || !p_sys->b_pps ) )
 563     {
 564         block_ChainRelease( p_sys->p_frame );
 565         msg_Warn( p_dec, "waiting for SPS/PPS" );
 566
 567         /* Reset context */
 568         p_sys->slice.i_frame_type = 0;
 569         p_sys->p_frame = NULL;
 570         p_sys->b_slice = VLC_FALSE;
 571     }
 572
 573     if( ( !p_sys->b_sps || !p_sys->b_pps ) &&
 574         i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
 575     {
 576         p_sys->b_slice = VLC_TRUE;
 577         /* Fragment will be discarded later on */
 578     }
 579     else if( i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
 580     {
 581         uint8_t *dec;
 582         int i_dec, i_first_mb, i_slice_type;
 583         slice_t slice;
 584         vlc_bool_t b_pic;
 585         bs_t s;
 586
 587         /* do not convert the whole frame */
 588         nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[5],
 589                          __MIN( p_frag->i_buffer - 5, 60 ) );
 590         bs_init( &s, dec, i_dec );
 591
 592         /* first_mb_in_slice */
 593         i_first_mb = bs_read_ue( &s );
 594
 595         /* slice_type */
 596         switch( (i_slice_type = bs_read_ue( &s )) )
 597         {
 598         case 0: case 5:
 599             slice.i_frame_type = BLOCK_FLAG_TYPE_P;
 600             break;
 601         case 1: case 6:
 602             slice.i_frame_type = BLOCK_FLAG_TYPE_B;
 603             break;
 604         case 2: case 7:
 605             slice.i_frame_type = BLOCK_FLAG_TYPE_I;
 606             break;
 607         case 3: case 8: /* SP */
 608             slice.i_frame_type = BLOCK_FLAG_TYPE_P;
 609             break;
 610         case 4: case 9:
 611             slice.i_frame_type = BLOCK_FLAG_TYPE_I;
 612             break;
 613         default:
 614             slice.i_frame_type = 0;
 615             break;
 616         }
 617
 618         /* */
 619         slice.i_nal_type = i_nal_type;
 620         slice.i_nal_ref_idc = i_nal_ref_idc;
 621
 622         slice.i_pic_parameter_set_id = bs_read_ue( &s );
 623         slice.i_frame_num = bs_read( &s, p_sys->i_log2_max_frame_num + 4 );
 624
 625         slice.i_field_pic_flag = 0;
 626         slice.i_bottom_field_flag = -1;
 627         if( !p_sys->b_frame_mbs_only )
 628         {
 629             /* field_pic_flag */
 630             slice.i_field_pic_flag = bs_read( &s, 1 );
 631             if( slice.i_field_pic_flag )
 632                 slice.i_bottom_field_flag = bs_read( &s, 1 );
 633         }
 634
 635         slice.i_idr_pic_id = p_sys->slice.i_idr_pic_id;
 636         if( slice.i_nal_type == NAL_SLICE_IDR )
 637             slice.i_idr_pic_id = bs_read_ue( &s );
 638
 639         slice.i_pic_order_cnt_lsb = -1;
 640         slice.i_delta_pic_order_cnt_bottom = -1;
 641         slice.i_delta_pic_order_cnt0 = 0;
 642         slice.i_delta_pic_order_cnt1 = 0;
 643         if( p_sys->i_pic_order_cnt_type == 0 )
 644         {
 645             slice.i_pic_order_cnt_lsb = bs_read( &s, p_sys->i_log2_max_pic_order_cnt_lsb + 4 );
 646             if( p_sys->i_pic_order_present_flag && !slice.i_field_pic_flag )
 647                 slice.i_delta_pic_order_cnt_bottom = bs_read_se( &s );
 648         }
 649         else if( p_sys->i_pic_order_cnt_type == 1 && !p_sys->i_delta_pic_order_always_zero_flag )
 650         {
 651             slice.i_delta_pic_order_cnt0 = bs_read_se( &s );
 652             if( p_sys->i_pic_order_present_flag && !slice.i_field_pic_flag )
 653                 slice.i_delta_pic_order_cnt1 = bs_read_se( &s );
 654         }
 655
 656         /* Detection of the first VCL NAL unit of a primary coded picture
 657          * (cf. 7.4.1.2.4) */
 658         b_pic = VLC_FALSE;
 659         if( slice.i_frame_num != p_sys->slice.i_frame_num ||
 660             slice.i_pic_parameter_set_id != p_sys->slice.i_pic_parameter_set_id ||
 661             slice.i_field_pic_flag != p_sys->slice.i_field_pic_flag ||
 662             slice.i_nal_ref_idc != p_sys->slice.i_nal_ref_idc )
 663             b_pic = VLC_TRUE;
 664         if( slice.i_bottom_field_flag != -1 && p_sys->slice.i_bottom_field_flag != -1 && slice.i_bottom_field_flag != p_sys->slice.i_bottom_field_flag )
 665             b_pic = VLC_TRUE;
 666         if( p_sys->i_pic_order_cnt_type == 0 &&
 667             ( slice.i_pic_order_cnt_lsb != p_sys->slice.i_pic_order_cnt_lsb ||
 668               slice.i_delta_pic_order_cnt_bottom != p_sys->slice.i_delta_pic_order_cnt_bottom ) )
 669             b_pic = VLC_TRUE;
 670         else if( p_sys->i_pic_order_cnt_type == 1 &&
 671                  ( slice.i_delta_pic_order_cnt0 != p_sys->slice.i_delta_pic_order_cnt0 ||
 672                    slice.i_delta_pic_order_cnt1 != p_sys->slice.i_delta_pic_order_cnt1 ) )
 673             b_pic = VLC_TRUE;
 674         if( ( slice.i_nal_type == NAL_SLICE_IDR || p_sys->slice.i_nal_type == NAL_SLICE_IDR ) &&
 675             ( slice.i_nal_type != p_sys->slice.i_nal_type || slice.i_idr_pic_id != p_sys->slice.i_idr_pic_id ) )
 676                 b_pic = VLC_TRUE;
 677
 678         /* */
 679         p_sys->slice = slice;
 680
 681         if( b_pic && p_sys->b_slice )
 682             OUTPUT;
 683
 684         p_sys->b_slice = VLC_TRUE;
 685
 686         free( dec );
 687     }
 688     else if( i_nal_type == NAL_SPS )
 689     {
 690         uint8_t *dec;
 691         int     i_dec;
 692         bs_t s;
 693         int i_tmp;
 694
 695         if( !p_sys->b_sps ) msg_Dbg( p_dec, "found NAL_SPS" );
 696
 697         p_sys->b_sps = VLC_TRUE;
 698
 699         nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[5],
 700                          p_frag->i_buffer - 5 );
 701
 702         bs_init( &s, dec, i_dec );
 703         /* Skip profile(8), constraint_set012, reserver(5), level(8) */
 704         bs_skip( &s, 8 + 1+1+1 + 5 + 8 );
 705         /* sps id */
 706         bs_read_ue( &s );
 707         /* Skip i_log2_max_frame_num */
 708         p_sys->i_log2_max_frame_num = bs_read_ue( &s );
 709         if( p_sys->i_log2_max_frame_num > 12)
 710             p_sys->i_log2_max_frame_num = 12;
 711         /* Read poc_type */
 712         p_sys->i_pic_order_cnt_type = bs_read_ue( &s );
 713         if( p_sys->i_pic_order_cnt_type == 0 )
 714         {
 715             /* skip i_log2_max_poc_lsb */
 716             p_sys->i_log2_max_pic_order_cnt_lsb = bs_read_ue( &s );
 717             if( p_sys->i_log2_max_pic_order_cnt_lsb > 12 )
 718                 p_sys->i_log2_max_pic_order_cnt_lsb = 12;
 719         }
 720         else if( p_sys->i_pic_order_cnt_type == 1 )
 721         {
 722             int i_cycle;
 723             /* skip b_delta_pic_order_always_zero */
 724             p_sys->i_delta_pic_order_always_zero_flag = bs_read( &s, 1 );
 725             /* skip i_offset_for_non_ref_pic */
 726             bs_read_se( &s );
 727             /* skip i_offset_for_top_to_bottom_field */
 728             bs_read_se( &s );
 729             /* read i_num_ref_frames_in_poc_cycle */
 730             i_cycle = bs_read_ue( &s );
 731             if( i_cycle > 256 ) i_cycle = 256;
 732             while( i_cycle > 0 )
 733             {
 734                 /* skip i_offset_for_ref_frame */
 735                 bs_read_se(&s );
 736             }
 737         }
 738         /* i_num_ref_frames */
 739         bs_read_ue( &s );
 740         /* b_gaps_in_frame_num_value_allowed */
 741         bs_skip( &s, 1 );
 742
 743         /* Read size */
 744         p_dec->fmt_out.video.i_width  = 16 * ( bs_read_ue( &s ) + 1 );
 745         p_dec->fmt_out.video.i_height = 16 * ( bs_read_ue( &s ) + 1 );
 746
 747         /* b_frame_mbs_only */
 748         p_sys->b_frame_mbs_only = bs_read( &s, 1 );
 749         if( p_sys->b_frame_mbs_only == 0 )
 750         {
 751             bs_skip( &s, 1 );
 752         }
 753         /* b_direct8x8_inference */
 754         bs_skip( &s, 1 );
 755
 756         /* crop */
 757         i_tmp = bs_read( &s, 1 );
 758         if( i_tmp )
 759         {
 760             /* left */
 761             bs_read_ue( &s );
 762             /* right */
 763             bs_read_ue( &s );
 764             /* top */
 765             bs_read_ue( &s );
 766             /* bottom */
 767             bs_read_ue( &s );
 768         }
 769
 770         /* vui */
 771         i_tmp = bs_read( &s, 1 );
 772         if( i_tmp )
 773         {
 774             /* read the aspect ratio part if any FIXME check it */
 775             i_tmp = bs_read( &s, 1 );
 776             if( i_tmp )
 777             {
 778                 static const struct { int w, h; } sar[14] =
 779                 {
 780                     { 0,   0 }, { 1,   1 }, { 12, 11 }, { 10, 11 },
 781                     { 16, 11 }, { 40, 33 }, { 24, 11 }, { 20, 11 },
 782                     { 32, 11 }, { 80, 33 }, { 18, 11 }, { 15, 11 },
 783                     { 64, 33 }, { 160,99 },
 784                 };
 785                 int i_sar = bs_read( &s, 8 );
 786                 int w, h;
 787
 788                 if( i_sar < 14 )
 789                 {
 790                     w = sar[i_sar].w;
 791                     h = sar[i_sar].h;
 792                 }
 793                 else
 794                 {
 795                     w = bs_read( &s, 16 );
 796                     h = bs_read( &s, 16 );
 797                 }
 798                 if( h != 0 )
 799                     p_dec->fmt_out.video.i_aspect = VOUT_ASPECT_FACTOR * w /
 800                         h * p_dec->fmt_out.video.i_width /
 801                         p_dec->fmt_out.video.i_height;
 802                 else
 803                     p_dec->fmt_out.video.i_aspect = VOUT_ASPECT_FACTOR;
 804             }
 805         }
 806
 807         free( dec );
 808
 809         if( p_sys->b_slice ) OUTPUT;
 810
 811         /* We have a new SPS */
 812         if( p_sys->p_sps ) block_Release( p_sys->p_sps );
 813         p_sys->p_sps = p_frag;
 814
 815         /* Do not append the SPS because we will insert it on keyframes */
 816         return p_pic;
 817     }
 818     else if( i_nal_type == NAL_PPS )
 819     {
 820         bs_t s;
 821
 822         bs_init( &s, &p_frag->p_buffer[5], p_frag->i_buffer - 5 );
 823         bs_read_ue( &s ); // pps id
 824         bs_read_ue( &s ); // sps id
 825         bs_skip( &s, 1 ); // entropy coding mode flag
 826         p_sys->i_pic_order_present_flag = bs_read( &s, 1 );
 827
 828         if( !p_sys->b_pps ) msg_Dbg( p_dec, "found NAL_PPS" );
 829         p_sys->b_pps = VLC_TRUE;
 830
 831         /* TODO */
 832
 833         if( p_sys->b_slice ) OUTPUT;
 834
 835         /* We have a new PPS */
 836         if( p_sys->p_pps ) block_Release( p_sys->p_pps );
 837         p_sys->p_pps = p_frag;
 838
 839         /* Do not append the PPS because we will insert it on keyframes */
 840         return p_pic;
 841     }
 842     else if( i_nal_type == NAL_AU_DELIMITER ||
 843              i_nal_type == NAL_SEI ||
 844              ( i_nal_type >= 13 && i_nal_type <= 18 ) )
 845     {
 846         if( p_sys->b_slice ) OUTPUT;
 847     }
 848
 849 #undef OUTPUT
 850
 851     /* Append the block */
 852     block_ChainAppend( &p_sys->p_frame, p_frag );
 853
 854     return p_pic;
 855 }