git.sesse.net Git - vlc/blob - modules/demux/ogg.c

   1 /*****************************************************************************
   2  * ogg.c : ogg stream demux module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2001-2007 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Gildas Bazin <gbazin@netcourrier.com>
   8  *          Andre Pang <Andre.Pang@csiro.au> (Annodex support)
   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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_demux.h>
  35 #include <vlc_meta.h>
  36 #include <vlc_input.h>
  37
  38 #include <ogg/ogg.h>
  39
  40 #include <vlc_codecs.h>
  41 #include <vlc_bits.h>
  42
  43 /*****************************************************************************
  44  * Module descriptor
  45  *****************************************************************************/
  46 static int  Open ( vlc_object_t * );
  47 static void Close( vlc_object_t * );
  48
  49 vlc_module_begin();
  50     set_shortname ( "OGG" );
  51     set_description( N_("OGG demuxer" ) );
  52     set_category( CAT_INPUT );
  53     set_subcategory( SUBCAT_INPUT_DEMUX );
  54     set_capability( "demux", 50 );
  55     set_callbacks( Open, Close );
  56     add_shortcut( "ogg" );
  57 vlc_module_end();
  58
  59
  60 /*****************************************************************************
  61  * Definitions of structures and functions used by this plugins
  62  *****************************************************************************/
  63 typedef struct logical_stream_s
  64 {
  65     ogg_stream_state os;                        /* logical stream of packets */
  66
  67     es_format_t      fmt;
  68     es_format_t      fmt_old;                  /* format of old ES is reused */
  69     es_out_id_t      *p_es;
  70     double           f_rate;
  71
  72     int              i_serial_no;
  73
  74     /* the header of some logical streams (eg vorbis) contain essential
  75      * data for the decoder. We back them up here in case we need to re-feed
  76      * them to the decoder. */
  77     int              b_force_backup;
  78     int              i_packets_backup;
  79     uint8_t          *p_headers;
  80     int              i_headers;
  81
  82     /* program clock reference (in units of 90kHz) derived from the previous
  83      * granulepos */
  84     mtime_t          i_pcr;
  85     mtime_t          i_interpolated_pcr;
  86     mtime_t          i_previous_pcr;
  87
  88     /* Misc */
  89     int b_reinit;
  90     int i_granule_shift;
  91
  92     /* kate streams have the number of headers in the ID header */
  93     int i_kate_num_headers;
  94
  95     /* for Annodex logical bitstreams */
  96     int secondary_header_packets;
  97
  98 } logical_stream_t;
  99
 100 struct demux_sys_t
 101 {
 102     ogg_sync_state oy;        /* sync and verify incoming physical bitstream */
 103
 104     int i_streams;                           /* number of logical bitstreams */
 105     logical_stream_t **pp_stream;  /* pointer to an array of logical streams */
 106
 107     logical_stream_t *p_old_stream; /* pointer to a old logical stream to avoid recreating it */
 108
 109     /* program clock reference (in units of 90kHz) derived from the pcr of
 110      * the sub-streams */
 111     mtime_t i_pcr;
 112
 113     /* stream state */
 114     int     i_eos;
 115
 116     /* bitrate */
 117     int     i_bitrate;
 118 };
 119
 120 /* OggDS headers for the new header format (used in ogm files) */
 121 typedef struct stream_header_video
 122 {
 123     ogg_int32_t width;
 124     ogg_int32_t height;
 125 } stream_header_video;
 126
 127 typedef struct stream_header_audio
 128 {
 129     ogg_int16_t channels;
 130     ogg_int16_t blockalign;
 131     ogg_int32_t avgbytespersec;
 132 } stream_header_audio;
 133
 134 typedef struct stream_header
 135 {
 136     char        streamtype[8];
 137     char        subtype[4];
 138
 139     ogg_int32_t size;                               /* size of the structure */
 140
 141     ogg_int64_t time_unit;                              /* in reference time */
 142     ogg_int64_t samples_per_unit;
 143     ogg_int32_t default_len;                                /* in media time */
 144
 145     ogg_int32_t buffersize;
 146     ogg_int16_t bits_per_sample;
 147
 148     union
 149     {
 150         /* Video specific */
 151         stream_header_video video;
 152         /* Audio specific */
 153         stream_header_audio audio;
 154     } sh;
 155 } stream_header;
 156
 157 #define OGG_BLOCK_SIZE 4096
 158
 159 /* Some defines from OggDS */
 160 #define PACKET_TYPE_HEADER   0x01
 161 #define PACKET_TYPE_BITS     0x07
 162 #define PACKET_LEN_BITS01    0xc0
 163 #define PACKET_LEN_BITS2     0x02
 164 #define PACKET_IS_SYNCPOINT  0x08
 165
 166 /*****************************************************************************
 167  * Local prototypes
 168  *****************************************************************************/
 169 static int  Demux  ( demux_t * );
 170 static int  Control( demux_t *, int, va_list );
 171
 172 /* Bitstream manipulation */
 173 static int  Ogg_ReadPage     ( demux_t *, ogg_page * );
 174 static void Ogg_UpdatePCR    ( logical_stream_t *, ogg_packet * );
 175 static void Ogg_DecodePacket ( demux_t *, logical_stream_t *, ogg_packet * );
 176
 177 static int Ogg_BeginningOfStream( demux_t *p_demux );
 178 static int Ogg_FindLogicalStreams( demux_t *p_demux );
 179 static void Ogg_EndOfStream( demux_t *p_demux );
 180
 181 /* */
 182 static void Ogg_LogicalStreamDelete( demux_t *p_demux, logical_stream_t *p_stream );
 183 static bool Ogg_LogicalStreamResetEsFormat( demux_t *p_demux, logical_stream_t *p_stream );
 184
 185 /* Logical bitstream headers */
 186 static void Ogg_ReadTheoraHeader( logical_stream_t *, ogg_packet * );
 187 static void Ogg_ReadVorbisHeader( logical_stream_t *, ogg_packet * );
 188 static void Ogg_ReadSpeexHeader( logical_stream_t *, ogg_packet * );
 189 static void Ogg_ReadKateHeader( logical_stream_t *, ogg_packet * );
 190 static void Ogg_ReadFlacHeader( demux_t *, logical_stream_t *, ogg_packet * );
 191 static void Ogg_ReadAnnodexHeader( vlc_object_t *, logical_stream_t *, ogg_packet * );
 192 static void Ogg_ReadDiracHeader( logical_stream_t *, ogg_packet * );
 193 static uint32_t Ogg_ReadDiracPictureNumber( ogg_packet *p_oggpacket );
 194
 195 /*****************************************************************************
 196  * Open: initializes ogg demux structures
 197  *****************************************************************************/
 198 static int Open( vlc_object_t * p_this )
 199 {
 200     demux_t *p_demux = (demux_t *)p_this;
 201     demux_sys_t    *p_sys;
 202     const uint8_t  *p_peek;
 203
 204
 205     /* Check if we are dealing with an ogg stream */
 206     if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 ) return VLC_EGENERIC;
 207     if( !p_demux->b_force && memcmp( p_peek, "OggS", 4 ) )
 208     {
 209         return VLC_EGENERIC;
 210     }
 211
 212     /* Set exported functions */
 213     p_demux->pf_demux = Demux;
 214     p_demux->pf_control = Control;
 215     p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
 216
 217     memset( p_sys, 0, sizeof( demux_sys_t ) );
 218     p_sys->i_bitrate = 0;
 219     p_sys->pp_stream = NULL;
 220     p_sys->p_old_stream = NULL;
 221
 222     /* Begnning of stream, tell the demux to look for elementary streams. */
 223     p_sys->i_eos = 0;
 224
 225     /* Initialize the Ogg physical bitstream parser */
 226     ogg_sync_init( &p_sys->oy );
 227
 228     return VLC_SUCCESS;
 229 }
 230
 231 /*****************************************************************************
 232  * Close: frees unused data
 233  *****************************************************************************/
 234 static void Close( vlc_object_t *p_this )
 235 {
 236     demux_t *p_demux = (demux_t *)p_this;
 237     demux_sys_t *p_sys = p_demux->p_sys  ;
 238
 239     /* Cleanup the bitstream parser */
 240     ogg_sync_clear( &p_sys->oy );
 241
 242     Ogg_EndOfStream( p_demux );
 243
 244     if( p_sys->p_old_stream )
 245         Ogg_LogicalStreamDelete( p_demux, p_sys->p_old_stream );
 246
 247     free( p_sys );
 248 }
 249
 250 /*****************************************************************************
 251  * Demux: reads and demuxes data packets
 252  *****************************************************************************
 253  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 254  *****************************************************************************/
 255 static int Demux( demux_t * p_demux )
 256 {
 257     demux_sys_t *p_sys = p_demux->p_sys;
 258     ogg_page    oggpage;
 259     ogg_packet  oggpacket;
 260     int         i_stream;
 261
 262
 263     if( p_sys->i_eos == p_sys->i_streams )
 264     {
 265         if( p_sys->i_eos )
 266         {
 267             msg_Dbg( p_demux, "end of a group of logical streams" );
 268             /* We keep the ES to try reusing it in Ogg_BeginningOfStream
 269              * only 1 ES is supported (common case for ogg web radio) */
 270             if( p_sys->i_streams == 1 )
 271             {
 272                 p_sys->p_old_stream = p_sys->pp_stream[0];
 273                 TAB_CLEAN( p_sys->i_streams, p_sys->pp_stream );
 274             }
 275             Ogg_EndOfStream( p_demux );
 276         }
 277
 278         p_sys->i_eos = 0;
 279         if( Ogg_BeginningOfStream( p_demux ) != VLC_SUCCESS )
 280             return 0;
 281
 282         msg_Dbg( p_demux, "beginning of a group of logical streams" );
 283         es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
 284     }
 285
 286     /*
 287      * Demux an ogg page from the stream
 288      */
 289     if( Ogg_ReadPage( p_demux, &oggpage ) != VLC_SUCCESS )
 290     {
 291         return 0; /* EOF */
 292     }
 293
 294     /* Test for End of Stream */
 295     if( ogg_page_eos( &oggpage ) ) p_sys->i_eos++;
 296
 297
 298     for( i_stream = 0; i_stream < p_sys->i_streams; i_stream++ )
 299     {
 300         logical_stream_t *p_stream = p_sys->pp_stream[i_stream];
 301
 302         if( ogg_stream_pagein( &p_stream->os, &oggpage ) != 0 )
 303             continue;
 304
 305         while( ogg_stream_packetout( &p_stream->os, &oggpacket ) > 0 )
 306         {
 307             /* Read info from any secondary header packets, if there are any */
 308             if( p_stream->secondary_header_packets > 0 )
 309             {
 310                 if( p_stream->fmt.i_codec == VLC_FOURCC('t','h','e','o') &&
 311                         oggpacket.bytes >= 7 &&
 312                         ! memcmp( oggpacket.packet, "\x80theora", 7 ) )
 313                 {
 314                     Ogg_ReadTheoraHeader( p_stream, &oggpacket );
 315                     p_stream->secondary_header_packets = 0;
 316                 }
 317                 else if( p_stream->fmt.i_codec == VLC_FOURCC('v','o','r','b') &&
 318                         oggpacket.bytes >= 7 &&
 319                         ! memcmp( oggpacket.packet, "\x01vorbis", 7 ) )
 320                 {
 321                     Ogg_ReadVorbisHeader( p_stream, &oggpacket );
 322                     p_stream->secondary_header_packets = 0;
 323                 }
 324                 else if ( p_stream->fmt.i_codec == VLC_FOURCC('c','m','m','l') )
 325                 {
 326                     p_stream->secondary_header_packets = 0;
 327                 }
 328             }
 329
 330             if( p_stream->b_reinit )
 331             {
 332                 /* If synchro is re-initialized we need to drop all the packets
 333                  * until we find a new dated one. */
 334                 Ogg_UpdatePCR( p_stream, &oggpacket );
 335
 336                 if( p_stream->i_pcr >= 0 )
 337                 {
 338                     p_stream->b_reinit = 0;
 339                 }
 340                 else
 341                 {
 342                     p_stream->i_interpolated_pcr = -1;
 343                     continue;
 344                 }
 345
 346                 /* An Ogg/vorbis packet contains an end date granulepos */
 347                 if( p_stream->fmt.i_codec == VLC_FOURCC( 'v','o','r','b' ) ||
 348                     p_stream->fmt.i_codec == VLC_FOURCC( 's','p','x',' ' ) ||
 349                     p_stream->fmt.i_codec == VLC_FOURCC( 'f','l','a','c' ) )
 350                 {
 351                     if( ogg_stream_packetout( &p_stream->os, &oggpacket ) > 0 )
 352                     {
 353                         Ogg_DecodePacket( p_demux, p_stream, &oggpacket );
 354                     }
 355                     else
 356                     {
 357                         es_out_Control( p_demux->out, ES_OUT_SET_PCR,
 358                                         p_stream->i_pcr );
 359                     }
 360                     continue;
 361                 }
 362             }
 363
 364             Ogg_DecodePacket( p_demux, p_stream, &oggpacket );
 365         }
 366         break;
 367     }
 368
 369     i_stream = 0; p_sys->i_pcr = -1;
 370     for( ; i_stream < p_sys->i_streams; i_stream++ )
 371     {
 372         logical_stream_t *p_stream = p_sys->pp_stream[i_stream];
 373
 374         if( p_stream->fmt.i_cat == SPU_ES )
 375             continue;
 376         if( p_stream->i_interpolated_pcr < 0 )
 377             continue;
 378
 379         if( p_sys->i_pcr < 0 || p_stream->i_interpolated_pcr < p_sys->i_pcr )
 380             p_sys->i_pcr = p_stream->i_interpolated_pcr;
 381     }
 382
 383     if( p_sys->i_pcr >= 0 )
 384     {
 385         es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_pcr );
 386     }
 387
 388     return 1;
 389 }
 390
 391 /*****************************************************************************
 392  * Control:
 393  *****************************************************************************/
 394 static int Control( demux_t *p_demux, int i_query, va_list args )
 395 {
 396     demux_sys_t *p_sys  = p_demux->p_sys;
 397     int64_t *pi64;
 398     bool *pb_bool;
 399     int i;
 400
 401     switch( i_query )
 402     {
 403         case DEMUX_HAS_UNSUPPORTED_META:
 404             pb_bool = (bool*)va_arg( args, bool* );
 405             *pb_bool = true;
 406             return VLC_SUCCESS;
 407
 408         case DEMUX_GET_TIME:
 409             pi64 = (int64_t*)va_arg( args, int64_t * );
 410             *pi64 = p_sys->i_pcr;
 411             return VLC_SUCCESS;
 412
 413         case DEMUX_SET_TIME:
 414             return VLC_EGENERIC;
 415
 416         case DEMUX_SET_POSITION:
 417             for( i = 0; i < p_sys->i_streams; i++ )
 418             {
 419                 logical_stream_t *p_stream = p_sys->pp_stream[i];
 420
 421                 /* we'll trash all the data until we find the next pcr */
 422                 p_stream->b_reinit = 1;
 423                 p_stream->i_pcr = -1;
 424                 p_stream->i_interpolated_pcr = -1;
 425                 ogg_stream_reset( &p_stream->os );
 426             }
 427             ogg_sync_reset( &p_sys->oy );
 428
 429         default:
 430             return demux_vaControlHelper( p_demux->s, 0, -1, p_sys->i_bitrate,
 431                                            1, i_query, args );
 432     }
 433 }
 434
 435 /****************************************************************************
 436  * Ogg_ReadPage: Read a full Ogg page from the physical bitstream.
 437  ****************************************************************************
 438  * Returns VLC_SUCCESS if a page has been read. An error might happen if we
 439  * are at the end of stream.
 440  ****************************************************************************/
 441 static int Ogg_ReadPage( demux_t *p_demux, ogg_page *p_oggpage )
 442 {
 443     demux_sys_t *p_ogg = p_demux->p_sys  ;
 444     int i_read = 0;
 445     char *p_buffer;
 446
 447     while( ogg_sync_pageout( &p_ogg->oy, p_oggpage ) != 1 )
 448     {
 449         p_buffer = ogg_sync_buffer( &p_ogg->oy, OGG_BLOCK_SIZE );
 450
 451         i_read = stream_Read( p_demux->s, p_buffer, OGG_BLOCK_SIZE );
 452         if( i_read <= 0 )
 453             return VLC_EGENERIC;
 454
 455         ogg_sync_wrote( &p_ogg->oy, i_read );
 456     }
 457
 458     return VLC_SUCCESS;
 459 }
 460
 461 /****************************************************************************
 462  * Ogg_UpdatePCR: update the PCR (90kHz program clock reference) for the
 463  *                current stream.
 464  ****************************************************************************/
 465 static void Ogg_UpdatePCR( logical_stream_t *p_stream,
 466                            ogg_packet *p_oggpacket )
 467 {
 468     /* Convert the granulepos into a pcr */
 469     if( p_oggpacket->granulepos >= 0 )
 470     {
 471         if( p_stream->fmt.i_codec == VLC_FOURCC( 't','h','e','o' ) ||
 472             p_stream->fmt.i_codec == VLC_FOURCC( 'd','r','a','c' ) ||
 473             p_stream->fmt.i_codec == VLC_FOURCC( 'k','a','t','e' ) )
 474         {
 475             ogg_int64_t iframe = p_oggpacket->granulepos >>
 476               p_stream->i_granule_shift;
 477             ogg_int64_t pframe = p_oggpacket->granulepos -
 478               ( iframe << p_stream->i_granule_shift );
 479
 480             p_stream->i_pcr = ( iframe + pframe ) * INT64_C(1000000)
 481                               / p_stream->f_rate;
 482         }
 483         else
 484         {
 485             p_stream->i_pcr = p_oggpacket->granulepos * INT64_C(1000000)
 486                               / p_stream->f_rate;
 487         }
 488
 489         p_stream->i_interpolated_pcr = p_stream->i_pcr;
 490     }
 491     else
 492     {
 493         p_stream->i_pcr = -1;
 494
 495         /* no granulepos available, try to interpolate the pcr.
 496          * If we can't then don't touch the old value. */
 497         if( p_stream->fmt.i_cat == VIDEO_ES )
 498             /* 1 frame per packet */
 499             p_stream->i_interpolated_pcr += (INT64_C(1000000) / p_stream->f_rate);
 500         else if( p_stream->fmt.i_bitrate )
 501             p_stream->i_interpolated_pcr +=
 502                 ( p_oggpacket->bytes * INT64_C(1000000) /
 503                   p_stream->fmt.i_bitrate / 8 );
 504     }
 505 }
 506
 507 /****************************************************************************
 508  * Ogg_DecodePacket: Decode an Ogg packet.
 509  ****************************************************************************/
 510 static void Ogg_DecodePacket( demux_t *p_demux,
 511                               logical_stream_t *p_stream,
 512                               ogg_packet *p_oggpacket )
 513 {
 514     block_t *p_block;
 515     bool b_selected;
 516     int i_header_len = 0;
 517     mtime_t i_pts = -1, i_interpolated_pts;
 518
 519     /* Sanity check */
 520     if( !p_oggpacket->bytes )
 521     {
 522         msg_Dbg( p_demux, "discarding 0 sized packet" );
 523         return;
 524     }
 525
 526     if( p_oggpacket->bytes >= 7 &&
 527         ! memcmp ( p_oggpacket->packet, "Annodex", 7 ) )
 528     {
 529         /* it's an Annodex packet -- skip it (do nothing) */
 530         return;
 531     }
 532     else if( p_oggpacket->bytes >= 7 &&
 533         ! memcmp ( p_oggpacket->packet, "AnxData", 7 ) )
 534     {
 535         /* it's an AnxData packet -- skip it (do nothing) */
 536         return;
 537     }
 538
 539     if( p_stream->fmt.i_codec == VLC_FOURCC( 's','u','b','t' ) &&
 540         p_oggpacket->packet[0] & PACKET_TYPE_BITS ) return;
 541
 542     /* Check the ES is selected */
 543     es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
 544                     p_stream->p_es, &b_selected );
 545
 546     if( p_stream->b_force_backup )
 547     {
 548         uint8_t *p_extra;
 549         bool b_store_size = true;
 550         bool b_store_num_headers = false;
 551
 552         p_stream->i_packets_backup++;
 553         switch( p_stream->fmt.i_codec )
 554         {
 555         case VLC_FOURCC( 'v','o','r','b' ):
 556         case VLC_FOURCC( 's','p','x',' ' ):
 557         case VLC_FOURCC( 't','h','e','o' ):
 558             if( p_stream->i_packets_backup == 3 ) p_stream->b_force_backup = 0;
 559             break;
 560
 561         case VLC_FOURCC( 'f','l','a','c' ):
 562             if( !p_stream->fmt.audio.i_rate && p_stream->i_packets_backup == 2 )
 563             {
 564                 Ogg_ReadFlacHeader( p_demux, p_stream, p_oggpacket );
 565                 p_stream->b_force_backup = 0;
 566             }
 567             else if( p_stream->fmt.audio.i_rate )
 568             {
 569                 p_stream->b_force_backup = 0;
 570                 if( p_oggpacket->bytes >= 9 )
 571                 {
 572                     p_oggpacket->packet += 9;
 573                     p_oggpacket->bytes -= 9;
 574                 }
 575             }
 576             b_store_size = false;
 577             break;
 578
 579         case VLC_FOURCC( 'k','a','t','e' ):
 580             if( p_stream->i_packets_backup == 1)
 581                 b_store_num_headers = true;
 582             if( p_stream->i_packets_backup == p_stream->i_kate_num_headers ) p_stream->b_force_backup = 0;
 583             break;
 584
 585         default:
 586             p_stream->b_force_backup = 0;
 587             break;
 588         }
 589
 590         /* Backup the ogg packet (likely an header packet) */
 591         p_stream->p_headers =
 592             realloc( p_stream->p_headers, p_stream->i_headers +
 593                      p_oggpacket->bytes + (b_store_size ? 2 : 0) + (b_store_num_headers ? 1 : 0) );
 594         p_extra = p_stream->p_headers + p_stream->i_headers;
 595         if( b_store_num_headers )
 596         {
 597             /* Kate streams store the number of headers in the first header,
 598                so we can't just test for 3 as Vorbis/Theora */
 599             *(p_extra++) = p_stream->i_kate_num_headers;
 600         }
 601         if( b_store_size )
 602         {
 603             *(p_extra++) = p_oggpacket->bytes >> 8;
 604             *(p_extra++) = p_oggpacket->bytes & 0xFF;
 605         }
 606         memcpy( p_extra, p_oggpacket->packet, p_oggpacket->bytes );
 607         p_stream->i_headers += p_oggpacket->bytes + (b_store_size ? 2 : 0) + (b_store_num_headers ? 1 : 0);
 608
 609         if( !p_stream->b_force_backup )
 610         {
 611             /* Last header received, commit changes */
 612             p_stream->fmt.i_extra = p_stream->i_headers;
 613             p_stream->fmt.p_extra =
 614                 realloc( p_stream->fmt.p_extra, p_stream->i_headers );
 615             memcpy( p_stream->fmt.p_extra, p_stream->p_headers,
 616                     p_stream->i_headers );
 617
 618             if( Ogg_LogicalStreamResetEsFormat( p_demux, p_stream ) )
 619                 es_out_Control( p_demux->out, ES_OUT_SET_FMT,
 620                                 p_stream->p_es, &p_stream->fmt );
 621         }
 622
 623         b_selected = false; /* Discard the header packet */
 624     }
 625
 626     /* Convert the pcr into a pts */
 627     if( p_stream->fmt.i_codec == VLC_FOURCC( 'v','o','r','b' ) ||
 628         p_stream->fmt.i_codec == VLC_FOURCC( 's','p','x',' ' ) ||
 629         p_stream->fmt.i_codec == VLC_FOURCC( 'f','l','a','c' ) )
 630     {
 631         if( p_stream->i_pcr >= 0 )
 632         {
 633             /* This is for streams where the granulepos of the header packets
 634              * doesn't match these of the data packets (eg. ogg web radios). */
 635             if( p_stream->i_previous_pcr == 0 &&
 636                 p_stream->i_pcr  > 3 * DEFAULT_PTS_DELAY )
 637             {
 638                 es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
 639
 640                 /* Call the pace control */
 641                 es_out_Control( p_demux->out, ES_OUT_SET_PCR,
 642                                 p_stream->i_pcr );
 643             }
 644
 645             p_stream->i_previous_pcr = p_stream->i_pcr;
 646
 647             /* The granulepos is the end date of the sample */
 648             i_pts =  p_stream->i_pcr;
 649         }
 650     }
 651
 652     /* Convert the granulepos into the next pcr */
 653     i_interpolated_pts = p_stream->i_interpolated_pcr;
 654     Ogg_UpdatePCR( p_stream, p_oggpacket );
 655
 656     if( p_stream->i_pcr >= 0 )
 657     {
 658         /* This is for streams where the granulepos of the header packets
 659          * doesn't match these of the data packets (eg. ogg web radios). */
 660         if( p_stream->i_previous_pcr == 0 &&
 661             p_stream->i_pcr  > 3 * DEFAULT_PTS_DELAY )
 662         {
 663             es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
 664
 665             /* Call the pace control */
 666             es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_stream->i_pcr );
 667         }
 668     }
 669
 670     if( p_stream->fmt.i_codec != VLC_FOURCC( 'v','o','r','b' ) &&
 671         p_stream->fmt.i_codec != VLC_FOURCC( 's','p','x',' ' ) &&
 672         p_stream->fmt.i_codec != VLC_FOURCC( 'f','l','a','c' ) &&
 673         p_stream->i_pcr >= 0 )
 674     {
 675         p_stream->i_previous_pcr = p_stream->i_pcr;
 676
 677         /* The granulepos is the start date of the sample */
 678         i_pts = p_stream->i_pcr;
 679     }
 680
 681     if( !b_selected )
 682     {
 683         /* This stream isn't currently selected so we don't need to decode it,
 684          * but we did need to store its pcr as it might be selected later on */
 685         return;
 686     }
 687
 688     if( p_oggpacket->bytes <= 0 )
 689         return;
 690
 691     if( !( p_block = block_New( p_demux, p_oggpacket->bytes ) ) ) return;
 692
 693     /* Normalize PTS */
 694     if( i_pts == 0 ) i_pts = 1;
 695     else if( i_pts == -1 && i_interpolated_pts == 0 ) i_pts = 1;
 696     else if( i_pts == -1 ) i_pts = 0;
 697
 698     if( p_stream->fmt.i_cat == AUDIO_ES )
 699         p_block->i_dts = p_block->i_pts = i_pts;
 700     else if( p_stream->fmt.i_cat == SPU_ES )
 701     {
 702         p_block->i_dts = p_block->i_pts = i_pts;
 703         p_block->i_length = 0;
 704     }
 705     else if( p_stream->fmt.i_codec == VLC_FOURCC( 't','h','e','o' ) )
 706         p_block->i_dts = p_block->i_pts = i_pts;
 707     else if( p_stream->fmt.i_codec == VLC_FOURCC( 'd','r','a','c' ) )
 708     {
 709         /* every packet[1] in the stream contains a picture, there may
 710          * be header cruft infront of it though
 711          * [1] EXCEPT the BOS page/packet */
 712         uint32_t u_pnum = Ogg_ReadDiracPictureNumber( p_oggpacket );
 713
 714         if ( u_pnum != 0xffffffff ) {
 715             p_block->i_dts =
 716             p_block->i_pts = (u_pnum * INT64_C(1000000) / p_stream->f_rate);
 717         }
 718     }
 719     else
 720     {
 721         p_block->i_dts = i_pts;
 722         p_block->i_pts = 0;
 723     }
 724
 725     if( p_stream->fmt.i_codec != VLC_FOURCC( 'v','o','r','b' ) &&
 726         p_stream->fmt.i_codec != VLC_FOURCC( 's','p','x',' ' ) &&
 727         p_stream->fmt.i_codec != VLC_FOURCC( 'f','l','a','c' ) &&
 728         p_stream->fmt.i_codec != VLC_FOURCC( 't','a','r','k' ) &&
 729         p_stream->fmt.i_codec != VLC_FOURCC( 't','h','e','o' ) &&
 730         p_stream->fmt.i_codec != VLC_FOURCC( 'c','m','m','l' ) &&
 731         p_stream->fmt.i_codec != VLC_FOURCC( 'd','r','a','c' ) &&
 732         p_stream->fmt.i_codec != VLC_FOURCC( 'k','a','t','e' ) )
 733     {
 734         /* We remove the header from the packet */
 735         i_header_len = (*p_oggpacket->packet & PACKET_LEN_BITS01) >> 6;
 736         i_header_len |= (*p_oggpacket->packet & PACKET_LEN_BITS2) << 1;
 737
 738         if( p_stream->fmt.i_codec == VLC_FOURCC( 's','u','b','t' ))
 739         {
 740             /* But with subtitles we need to retrieve the duration first */
 741             int i, lenbytes = 0;
 742
 743             if( i_header_len > 0 && p_oggpacket->bytes >= i_header_len + 1 )
 744             {
 745                 for( i = 0, lenbytes = 0; i < i_header_len; i++ )
 746                 {
 747                     lenbytes = lenbytes << 8;
 748                     lenbytes += *(p_oggpacket->packet + i_header_len - i);
 749                 }
 750             }
 751             if( p_oggpacket->bytes - 1 - i_header_len > 2 ||
 752                 ( p_oggpacket->packet[i_header_len + 1] != ' ' &&
 753                   p_oggpacket->packet[i_header_len + 1] != 0 &&
 754                   p_oggpacket->packet[i_header_len + 1] != '\n' &&
 755                   p_oggpacket->packet[i_header_len + 1] != '\r' ) )
 756             {
 757                 p_block->i_length = (mtime_t)lenbytes * 1000;
 758             }
 759         }
 760
 761         i_header_len++;
 762         if( p_block->i_buffer >= (unsigned int)i_header_len )
 763             p_block->i_buffer -= i_header_len;
 764         else
 765             p_block->i_buffer = 0;
 766     }
 767
 768     if( p_stream->fmt.i_codec == VLC_FOURCC( 't','a','r','k' ) )
 769     {
 770         /* FIXME: the biggest hack I've ever done */
 771         msg_Warn( p_demux, "tarkin pts: %"PRId64", granule: %"PRId64,
 772                   p_block->i_pts, p_block->i_dts );
 773         msleep(10000);
 774     }
 775
 776     memcpy( p_block->p_buffer, p_oggpacket->packet + i_header_len,
 777             p_oggpacket->bytes - i_header_len );
 778
 779     es_out_Send( p_demux->out, p_stream->p_es, p_block );
 780 }
 781
 782 /****************************************************************************
 783  * Ogg_FindLogicalStreams: Find the logical streams embedded in the physical
 784  *                         stream and fill p_ogg.
 785  *****************************************************************************
 786  * The initial page of a logical stream is marked as a 'bos' page.
 787  * Furthermore, the Ogg specification mandates that grouped bitstreams begin
 788  * together and all of the initial pages must appear before any data pages.
 789  *
 790  * On success this function returns VLC_SUCCESS.
 791  ****************************************************************************/
 792 static int Ogg_FindLogicalStreams( demux_t *p_demux )
 793 {
 794     demux_sys_t *p_ogg = p_demux->p_sys  ;
 795     ogg_packet oggpacket;
 796     ogg_page oggpage;
 797     int i_stream;
 798
 799 #define p_stream p_ogg->pp_stream[p_ogg->i_streams - 1]
 800
 801     while( Ogg_ReadPage( p_demux, &oggpage ) == VLC_SUCCESS )
 802     {
 803         if( ogg_page_bos( &oggpage ) )
 804         {
 805
 806             /* All is wonderful in our fine fine little world.
 807              * We found the beginning of our first logical stream. */
 808             while( ogg_page_bos( &oggpage ) )
 809             {
 810                 p_ogg->i_streams++;
 811                 p_ogg->pp_stream =
 812                     realloc( p_ogg->pp_stream, p_ogg->i_streams *
 813                              sizeof(logical_stream_t *) );
 814
 815                 p_stream = malloc( sizeof(logical_stream_t) );
 816                 memset( p_stream, 0, sizeof(logical_stream_t) );
 817                 p_stream->p_headers = 0;
 818                 p_stream->secondary_header_packets = 0;
 819
 820                 es_format_Init( &p_stream->fmt, 0, 0 );
 821                 es_format_Init( &p_stream->fmt_old, 0, 0 );
 822
 823                 /* Setup the logical stream */
 824                 p_stream->i_serial_no = ogg_page_serialno( &oggpage );
 825                 ogg_stream_init( &p_stream->os, p_stream->i_serial_no );
 826
 827                 /* Extract the initial header from the first page and verify
 828                  * the codec type of tis Ogg bitstream */
 829                 if( ogg_stream_pagein( &p_stream->os, &oggpage ) < 0 )
 830                 {
 831                     /* error. stream version mismatch perhaps */
 832                     msg_Err( p_demux, "error reading first page of "
 833                              "Ogg bitstream data" );
 834                     return VLC_EGENERIC;
 835                 }
 836
 837                 /* FIXME: check return value */
 838                 ogg_stream_packetpeek( &p_stream->os, &oggpacket );
 839
 840                 /* Check for Vorbis header */
 841                 if( oggpacket.bytes >= 7 &&
 842                     ! memcmp( oggpacket.packet, "\x01vorbis", 7 ) )
 843                 {
 844                     Ogg_ReadVorbisHeader( p_stream, &oggpacket );
 845                     msg_Dbg( p_demux, "found vorbis header" );
 846                 }
 847                 /* Check for Speex header */
 848                 else if( oggpacket.bytes >= 5 &&
 849                     ! memcmp( oggpacket.packet, "Speex", 5 ) )
 850                 {
 851                     Ogg_ReadSpeexHeader( p_stream, &oggpacket );
 852                     msg_Dbg( p_demux, "found speex header, channels: %i, "
 853                              "rate: %i,  bitrate: %i",
 854                              p_stream->fmt.audio.i_channels,
 855                              (int)p_stream->f_rate, p_stream->fmt.i_bitrate );
 856                 }
 857                 /* Check for Flac header (< version 1.1.1) */
 858                 else if( oggpacket.bytes >= 4 &&
 859                     ! memcmp( oggpacket.packet, "fLaC", 4 ) )
 860                 {
 861                     msg_Dbg( p_demux, "found FLAC header" );
 862
 863                     /* Grrrr!!!! Did they really have to put all the
 864                      * important info in the second header packet!!!
 865                      * (STREAMINFO metadata is in the following packet) */
 866                     p_stream->b_force_backup = 1;
 867
 868                     p_stream->fmt.i_cat = AUDIO_ES;
 869                     p_stream->fmt.i_codec = VLC_FOURCC( 'f','l','a','c' );
 870                 }
 871                 /* Check for Flac header (>= version 1.1.1) */
 872                 else if( oggpacket.bytes >= 13 && oggpacket.packet[0] ==0x7F &&
 873                     ! memcmp( &oggpacket.packet[1], "FLAC", 4 ) &&
 874                     ! memcmp( &oggpacket.packet[9], "fLaC", 4 ) )
 875                 {
 876                     int i_packets = ((int)oggpacket.packet[7]) << 8 |
 877                         oggpacket.packet[8];
 878                     msg_Dbg( p_demux, "found FLAC header version %i.%i "
 879                              "(%i header packets)",
 880                              oggpacket.packet[5], oggpacket.packet[6],
 881                              i_packets );
 882
 883                     p_stream->b_force_backup = 1;
 884
 885                     p_stream->fmt.i_cat = AUDIO_ES;
 886                     p_stream->fmt.i_codec = VLC_FOURCC( 'f','l','a','c' );
 887                     oggpacket.packet += 13; oggpacket.bytes -= 13;
 888                     Ogg_ReadFlacHeader( p_demux, p_stream, &oggpacket );
 889                 }
 890                 /* Check for Theora header */
 891                 else if( oggpacket.bytes >= 7 &&
 892                          ! memcmp( oggpacket.packet, "\x80theora", 7 ) )
 893                 {
 894                     Ogg_ReadTheoraHeader( p_stream, &oggpacket );
 895
 896                     msg_Dbg( p_demux,
 897                              "found theora header, bitrate: %i, rate: %f",
 898                              p_stream->fmt.i_bitrate, p_stream->f_rate );
 899                 }
 900                 /* Check for Dirac header */
 901                 else if( oggpacket.bytes >= 5 &&
 902                          ! memcmp( oggpacket.packet, "BBCD\x00", 5 ) )
 903                 {
 904                     Ogg_ReadDiracHeader( p_stream, &oggpacket );
 905                     msg_Dbg( p_demux, "found dirac header" );
 906                 }
 907                 /* Check for Tarkin header */
 908                 else if( oggpacket.bytes >= 7 &&
 909                          ! memcmp( &oggpacket.packet[1], "tarkin", 6 ) )
 910                 {
 911                     oggpack_buffer opb;
 912
 913                     msg_Dbg( p_demux, "found tarkin header" );
 914                     p_stream->fmt.i_cat = VIDEO_ES;
 915                     p_stream->fmt.i_codec = VLC_FOURCC( 't','a','r','k' );
 916
 917                     /* Cheat and get additionnal info ;) */
 918                     oggpack_readinit( &opb, oggpacket.packet, oggpacket.bytes);
 919                     oggpack_adv( &opb, 88 );
 920                     oggpack_adv( &opb, 104 );
 921                     p_stream->fmt.i_bitrate = oggpack_read( &opb, 32 );
 922                     p_stream->f_rate = 2; /* FIXME */
 923                     msg_Dbg( p_demux,
 924                              "found tarkin header, bitrate: %i, rate: %f",
 925                              p_stream->fmt.i_bitrate, p_stream->f_rate );
 926                 }
 927                 /* Check for Annodex header */
 928                 else if( oggpacket.bytes >= 7 &&
 929                          ! memcmp( oggpacket.packet, "Annodex", 7 ) )
 930                 {
 931                     Ogg_ReadAnnodexHeader( VLC_OBJECT(p_demux), p_stream,
 932                                            &oggpacket );
 933                     /* kill annodex track */
 934                     free( p_stream );
 935                     p_ogg->i_streams--;
 936                 }
 937                 /* Check for Annodex header */
 938                 else if( oggpacket.bytes >= 7 &&
 939                          ! memcmp( oggpacket.packet, "AnxData", 7 ) )
 940                 {
 941                     Ogg_ReadAnnodexHeader( VLC_OBJECT(p_demux), p_stream,
 942                                            &oggpacket );
 943                 }
 944                 /* Check for Kate header */
 945                 else if( oggpacket.bytes >= 8 &&
 946                     ! memcmp( &oggpacket.packet[1], "kate\0\0\0", 7 ) )
 947                 {
 948                     Ogg_ReadKateHeader( p_stream, &oggpacket );
 949                     msg_Dbg( p_demux, "found kate header" );
 950                 }
 951                 else if( oggpacket.bytes >= 142 &&
 952                          !memcmp( &oggpacket.packet[1],
 953                                    "Direct Show Samples embedded in Ogg", 35 ))
 954                 {
 955                     /* Old header type */
 956
 957                     /* Check for video header (old format) */
 958                     if( GetDWLE((oggpacket.packet+96)) == 0x05589f80 &&
 959                         oggpacket.bytes >= 184 )
 960                     {
 961                         p_stream->fmt.i_cat = VIDEO_ES;
 962                         p_stream->fmt.i_codec =
 963                             VLC_FOURCC( oggpacket.packet[68],
 964                                         oggpacket.packet[69],
 965                                         oggpacket.packet[70],
 966                                         oggpacket.packet[71] );
 967                         msg_Dbg( p_demux, "found video header of type: %.4s",
 968                                  (char *)&p_stream->fmt.i_codec );
 969
 970                         p_stream->fmt.video.i_frame_rate = 10000000;
 971                         p_stream->fmt.video.i_frame_rate_base =
 972                             GetQWLE((oggpacket.packet+164));
 973                         p_stream->f_rate = 10000000.0 /
 974                             GetQWLE((oggpacket.packet+164));
 975                         p_stream->fmt.video.i_bits_per_pixel =
 976                             GetWLE((oggpacket.packet+182));
 977                         if( !p_stream->fmt.video.i_bits_per_pixel )
 978                             /* hack, FIXME */
 979                             p_stream->fmt.video.i_bits_per_pixel = 24;
 980                         p_stream->fmt.video.i_width =
 981                             GetDWLE((oggpacket.packet+176));
 982                         p_stream->fmt.video.i_height =
 983                             GetDWLE((oggpacket.packet+180));
 984
 985                         msg_Dbg( p_demux,
 986                                  "fps: %f, width:%i; height:%i, bitcount:%i",
 987                                  p_stream->f_rate,
 988                                  p_stream->fmt.video.i_width,
 989                                  p_stream->fmt.video.i_height,
 990                                  p_stream->fmt.video.i_bits_per_pixel);
 991
 992                     }
 993                     /* Check for audio header (old format) */
 994                     else if( GetDWLE((oggpacket.packet+96)) == 0x05589F81 )
 995                     {
 996                         unsigned int i_extra_size;
 997                         unsigned int i_format_tag;
 998
 999                         p_stream->fmt.i_cat = AUDIO_ES;
1000
1001                         i_extra_size = GetWLE((oggpacket.packet+140));
1002                         if( i_extra_size )
1003                         {
1004                             p_stream->fmt.i_extra = i_extra_size;
1005                             p_stream->fmt.p_extra = malloc( i_extra_size );
1006                             memcpy( p_stream->fmt.p_extra,
1007                                     oggpacket.packet + 142, i_extra_size );
1008                         }
1009
1010                         i_format_tag = GetWLE((oggpacket.packet+124));
1011                         p_stream->fmt.audio.i_channels =
1012                             GetWLE((oggpacket.packet+126));
1013                         p_stream->f_rate = p_stream->fmt.audio.i_rate =
1014                             GetDWLE((oggpacket.packet+128));
1015                         p_stream->fmt.i_bitrate =
1016                             GetDWLE((oggpacket.packet+132)) * 8;
1017                         p_stream->fmt.audio.i_blockalign =
1018                             GetWLE((oggpacket.packet+136));
1019                         p_stream->fmt.audio.i_bitspersample =
1020                             GetWLE((oggpacket.packet+138));
1021
1022                         wf_tag_to_fourcc( i_format_tag,
1023                                           &p_stream->fmt.i_codec, 0 );
1024
1025                         if( p_stream->fmt.i_codec ==
1026                             VLC_FOURCC('u','n','d','f') )
1027                         {
1028                             p_stream->fmt.i_codec = VLC_FOURCC( 'm', 's',
1029                                 ( i_format_tag >> 8 ) & 0xff,
1030                                 i_format_tag & 0xff );
1031                         }
1032
1033                         msg_Dbg( p_demux, "found audio header of type: %.4s",
1034                                  (char *)&p_stream->fmt.i_codec );
1035                         msg_Dbg( p_demux, "audio:0x%4.4x channels:%d %dHz "
1036                                  "%dbits/sample %dkb/s",
1037                                  i_format_tag,
1038                                  p_stream->fmt.audio.i_channels,
1039                                  p_stream->fmt.audio.i_rate,
1040                                  p_stream->fmt.audio.i_bitspersample,
1041                                  p_stream->fmt.i_bitrate / 1024 );
1042
1043                     }
1044                     else
1045                     {
1046                         msg_Dbg( p_demux, "stream %d has an old header "
1047                             "but is of an unknown type", p_ogg->i_streams-1 );
1048                         free( p_stream );
1049                         p_ogg->i_streams--;
1050                     }
1051                 }
1052                 else if( (*oggpacket.packet & PACKET_TYPE_BITS )
1053                          == PACKET_TYPE_HEADER &&
1054                          oggpacket.bytes >= (int)sizeof(stream_header)+1 )
1055                 {
1056                     stream_header *st = (stream_header *)(oggpacket.packet+1);
1057
1058                     /* Check for video header (new format) */
1059                     if( !strncmp( st->streamtype, "video", 5 ) )
1060                     {
1061                         p_stream->fmt.i_cat = VIDEO_ES;
1062
1063                         /* We need to get rid of the header packet */
1064                         ogg_stream_packetout( &p_stream->os, &oggpacket );
1065
1066                         p_stream->fmt.i_codec =
1067                             VLC_FOURCC( st->subtype[0], st->subtype[1],
1068                                         st->subtype[2], st->subtype[3] );
1069                         msg_Dbg( p_demux, "found video header of type: %.4s",
1070                                  (char *)&p_stream->fmt.i_codec );
1071
1072                         p_stream->fmt.video.i_frame_rate = 10000000;
1073                         p_stream->fmt.video.i_frame_rate_base =
1074                             GetQWLE(&st->time_unit);
1075                         p_stream->f_rate = 10000000.0 /
1076                             GetQWLE(&st->time_unit);
1077                         p_stream->fmt.video.i_bits_per_pixel =
1078                             GetWLE(&st->bits_per_sample);
1079                         p_stream->fmt.video.i_width =
1080                             GetDWLE(&st->sh.video.width);
1081                         p_stream->fmt.video.i_height =
1082                             GetDWLE(&st->sh.video.height);
1083
1084                         msg_Dbg( p_demux,
1085                                  "fps: %f, width:%i; height:%i, bitcount:%i",
1086                                  p_stream->f_rate,
1087                                  p_stream->fmt.video.i_width,
1088                                  p_stream->fmt.video.i_height,
1089                                  p_stream->fmt.video.i_bits_per_pixel );
1090                     }
1091                     /* Check for audio header (new format) */
1092                     else if( !strncmp( st->streamtype, "audio", 5 ) )
1093                     {
1094                         char p_buffer[5];
1095                         int i_format_tag;
1096
1097                         p_stream->fmt.i_cat = AUDIO_ES;
1098
1099                         /* We need to get rid of the header packet */
1100                         ogg_stream_packetout( &p_stream->os, &oggpacket );
1101
1102                         p_stream->fmt.i_extra = GetQWLE(&st->size) -
1103                             sizeof(stream_header);
1104                         if( p_stream->fmt.i_extra )
1105                         {
1106                             p_stream->fmt.p_extra =
1107                                 malloc( p_stream->fmt.i_extra );
1108                             memcpy( p_stream->fmt.p_extra, st + 1,
1109                                     p_stream->fmt.i_extra );
1110                         }
1111
1112                         memcpy( p_buffer, st->subtype, 4 );
1113                         p_buffer[4] = '\0';
1114                         i_format_tag = strtol(p_buffer,NULL,16);
1115                         p_stream->fmt.audio.i_channels =
1116                             GetWLE(&st->sh.audio.channels);
1117                         p_stream->f_rate = p_stream->fmt.audio.i_rate =
1118                             GetQWLE(&st->samples_per_unit);
1119                         p_stream->fmt.i_bitrate =
1120                             GetDWLE(&st->sh.audio.avgbytespersec) * 8;
1121                         p_stream->fmt.audio.i_blockalign =
1122                             GetWLE(&st->sh.audio.blockalign);
1123                         p_stream->fmt.audio.i_bitspersample =
1124                             GetWLE(&st->bits_per_sample);
1125
1126                         wf_tag_to_fourcc( i_format_tag,
1127                                           &p_stream->fmt.i_codec, 0 );
1128
1129                         if( p_stream->fmt.i_codec ==
1130                             VLC_FOURCC('u','n','d','f') )
1131                         {
1132                             p_stream->fmt.i_codec = VLC_FOURCC( 'm', 's',
1133                                 ( i_format_tag >> 8 ) & 0xff,
1134                                 i_format_tag & 0xff );
1135                         }
1136
1137                         msg_Dbg( p_demux, "found audio header of type: %.4s",
1138                                  (char *)&p_stream->fmt.i_codec );
1139                         msg_Dbg( p_demux, "audio:0x%4.4x channels:%d %dHz "
1140                                  "%dbits/sample %dkb/s",
1141                                  i_format_tag,
1142                                  p_stream->fmt.audio.i_channels,
1143                                  p_stream->fmt.audio.i_rate,
1144                                  p_stream->fmt.audio.i_bitspersample,
1145                                  p_stream->fmt.i_bitrate / 1024 );
1146                     }
1147                     /* Check for text (subtitles) header */
1148                     else if( !strncmp(st->streamtype, "text", 4) )
1149                     {
1150                         /* We need to get rid of the header packet */
1151                         ogg_stream_packetout( &p_stream->os, &oggpacket );
1152
1153                         msg_Dbg( p_demux, "found text subtitles header" );
1154                         p_stream->fmt.i_cat = SPU_ES;
1155                         p_stream->fmt.i_codec = VLC_FOURCC('s','u','b','t');
1156                         p_stream->f_rate = 1000; /* granulepos is in milisec */
1157                     }
1158                     else
1159                     {
1160                         msg_Dbg( p_demux, "stream %d has a header marker "
1161                             "but is of an unknown type", p_ogg->i_streams-1 );
1162                         free( p_stream );
1163                         p_ogg->i_streams--;
1164                     }
1165                 }
1166                 else if( oggpacket.bytes >= 7 &&
1167                              ! memcmp( oggpacket.packet, "fishead", 7 ) )
1168
1169                 {
1170                     /* Skeleton */
1171                     msg_Dbg( p_demux, "stream %d is a skeleton",
1172                                 p_ogg->i_streams-1 );
1173                     /* FIXME: https://trac.videolan.org/vlc/ticket/1412 */
1174                 }
1175                 else
1176                 {
1177                     msg_Dbg( p_demux, "stream %d is of unknown type",
1178                              p_ogg->i_streams-1 );
1179                     free( p_stream );
1180                     p_ogg->i_streams--;
1181                 }
1182
1183                 if( Ogg_ReadPage( p_demux, &oggpage ) != VLC_SUCCESS )
1184                     return VLC_EGENERIC;
1185             }
1186
1187             /* This is the first data page, which means we are now finished
1188              * with the initial pages. We just need to store it in the relevant
1189              * bitstream. */
1190             for( i_stream = 0; i_stream < p_ogg->i_streams; i_stream++ )
1191             {
1192                 if( ogg_stream_pagein( &p_ogg->pp_stream[i_stream]->os,
1193                                        &oggpage ) == 0 )
1194                 {
1195                     break;
1196                 }
1197             }
1198
1199             return VLC_SUCCESS;
1200         }
1201     }
1202 #undef p_stream
1203
1204     return VLC_EGENERIC;
1205 }
1206
1207 /****************************************************************************
1208  * Ogg_BeginningOfStream: Look for Beginning of Stream ogg pages and add
1209  *                        Elementary streams.
1210  ****************************************************************************/
1211 static int Ogg_BeginningOfStream( demux_t *p_demux )
1212 {
1213     demux_sys_t *p_ogg = p_demux->p_sys  ;
1214     logical_stream_t *p_old_stream = p_ogg->p_old_stream;
1215     int i_stream;
1216
1217     /* Find the logical streams embedded in the physical stream and
1218      * initialize our p_ogg structure. */
1219     if( Ogg_FindLogicalStreams( p_demux ) != VLC_SUCCESS )
1220     {
1221         msg_Warn( p_demux, "couldn't find any ogg logical stream" );
1222         return VLC_EGENERIC;
1223     }
1224
1225     p_ogg->i_bitrate = 0;
1226
1227     for( i_stream = 0 ; i_stream < p_ogg->i_streams; i_stream++ )
1228     {
1229         logical_stream_t *p_stream = p_ogg->pp_stream[i_stream];
1230
1231         p_stream->p_es = NULL;
1232
1233         /* Try first to reuse an old ES */
1234         if( p_old_stream &&
1235             p_old_stream->fmt.i_cat == p_stream->fmt.i_cat &&
1236             p_old_stream->fmt.i_codec == p_stream->fmt.i_codec )
1237         {
1238             msg_Dbg( p_demux, "will reuse old stream to avoid glitch" );
1239
1240             p_stream->p_es = p_old_stream->p_es;
1241             es_format_Copy( &p_stream->fmt_old, &p_old_stream->fmt );
1242
1243             p_old_stream->p_es = NULL;
1244             p_old_stream = NULL;
1245         }
1246
1247         if( !p_stream->p_es )
1248             p_stream->p_es = es_out_Add( p_demux->out, &p_stream->fmt );
1249
1250         // TODO: something to do here ?
1251         if( p_stream->fmt.i_codec == VLC_FOURCC('c','m','m','l') )
1252         {
1253             /* Set the CMML stream active */
1254             es_out_Control( p_demux->out, ES_OUT_SET_ES, p_stream->p_es );
1255         }
1256
1257         p_ogg->i_bitrate += p_stream->fmt.i_bitrate;
1258
1259         p_stream->i_pcr = p_stream->i_previous_pcr =
1260             p_stream->i_interpolated_pcr = -1;
1261         p_stream->b_reinit = 0;
1262     }
1263
1264     if( p_ogg->p_old_stream )
1265     {
1266         if( p_ogg->p_old_stream->p_es )
1267             msg_Dbg( p_demux, "old stream not reused" );
1268         Ogg_LogicalStreamDelete( p_demux, p_ogg->p_old_stream );
1269         p_ogg->p_old_stream = NULL;
1270     }
1271     return VLC_SUCCESS;
1272 }
1273
1274 /****************************************************************************
1275  * Ogg_EndOfStream: clean up the ES when an End of Stream is detected.
1276  ****************************************************************************/
1277 static void Ogg_EndOfStream( demux_t *p_demux )
1278 {
1279     demux_sys_t *p_ogg = p_demux->p_sys  ;
1280     int i_stream;
1281
1282     for( i_stream = 0 ; i_stream < p_ogg->i_streams; i_stream++ )
1283         Ogg_LogicalStreamDelete( p_demux, p_ogg->pp_stream[i_stream] );
1284     free( p_ogg->pp_stream );
1285
1286     /* Reinit p_ogg */
1287     p_ogg->i_bitrate = 0;
1288     p_ogg->i_streams = 0;
1289     p_ogg->pp_stream = NULL;
1290 }
1291
1292 /**
1293  * This function delete and release all data associated to a logical_stream_t
1294  */
1295 static void Ogg_LogicalStreamDelete( demux_t *p_demux, logical_stream_t *p_stream )
1296 {
1297     if( p_stream->p_es )
1298         es_out_Del( p_demux->out, p_stream->p_es );
1299
1300     ogg_stream_clear( &p_stream->os );
1301     free( p_stream->p_headers );
1302
1303     es_format_Clean( &p_stream->fmt_old );
1304     es_format_Clean( &p_stream->fmt );
1305
1306     free( p_stream );
1307 }
1308 /**
1309  * This function check if a we need to reset a decoder in case we are
1310  * reusing an old ES
1311  */
1312 static bool Ogg_IsVorbisFormatCompatible( const es_format_t *p_new, const es_format_t *p_old )
1313 {
1314     int i_new = 0;
1315     int i_old = 0;
1316     int i;
1317
1318     for( i = 0; i < 3; i++ )
1319     {
1320         const uint8_t *p_new_extra = ( const uint8_t*)p_new->p_extra + i_new;
1321         const uint8_t *p_old_extra = ( const uint8_t*)p_old->p_extra + i_old;
1322
1323         if( p_new->i_extra < i_new+2 || p_old->i_extra < i_old+2 )
1324             return false;
1325
1326         const int i_new_size = GetWBE( &p_new_extra[0] );
1327         const int i_old_size = GetWBE( &p_old_extra[0] );
1328
1329         if( i != 1 ) /* Ignore vorbis comment */
1330         {
1331             if( i_new_size != i_old_size )
1332                 return false;
1333             if( memcmp( &p_new_extra[2], &p_old_extra[2], i_new_size ) )
1334                 return false;
1335         }
1336
1337         i_new += 2 + i_new_size;
1338         i_old += 2 + i_old_size;
1339     }
1340     return true;
1341 }
1342 static bool Ogg_LogicalStreamResetEsFormat( demux_t *p_demux, logical_stream_t *p_stream )
1343 {
1344     bool b_compatible;
1345     if( !p_stream->fmt_old.i_cat || !p_stream->fmt_old.i_codec )
1346         return true;
1347
1348     /* Only vorbis is supported */
1349     if( p_stream->fmt.i_codec == VLC_FOURCC( 'v','o','r','b' ) )
1350         b_compatible = Ogg_IsVorbisFormatCompatible( &p_stream->fmt, &p_stream->fmt_old );
1351
1352     if( !b_compatible )
1353         msg_Warn( p_demux, "cannot reuse old stream, resetting the decoder" );
1354
1355     return !b_compatible;
1356 }
1357
1358 static void Ogg_ReadTheoraHeader( logical_stream_t *p_stream,
1359                                   ogg_packet *p_oggpacket )
1360 {
1361     bs_t bitstream;
1362     int i_fps_numerator;
1363     int i_fps_denominator;
1364     int i_keyframe_frequency_force;
1365
1366     p_stream->fmt.i_cat = VIDEO_ES;
1367     p_stream->fmt.i_codec = VLC_FOURCC( 't','h','e','o' );
1368
1369     /* Signal that we want to keep a backup of the theora
1370      * stream headers. They will be used when switching between
1371      * audio streams. */
1372     p_stream->b_force_backup = 1;
1373
1374     /* Cheat and get additionnal info ;) */
1375     bs_init( &bitstream, p_oggpacket->packet, p_oggpacket->bytes );
1376     bs_skip( &bitstream, 56 );
1377     bs_read( &bitstream, 8 ); /* major version num */
1378     bs_read( &bitstream, 8 ); /* minor version num */
1379     bs_read( &bitstream, 8 ); /* subminor version num */
1380     bs_read( &bitstream, 16 ) /*<< 4*/; /* width */
1381     bs_read( &bitstream, 16 ) /*<< 4*/; /* height */
1382     bs_read( &bitstream, 24 ); /* frame width */
1383     bs_read( &bitstream, 24 ); /* frame height */
1384     bs_read( &bitstream, 8 ); /* x offset */
1385     bs_read( &bitstream, 8 ); /* y offset */
1386
1387     i_fps_numerator = bs_read( &bitstream, 32 );
1388     i_fps_denominator = bs_read( &bitstream, 32 );
1389     bs_read( &bitstream, 24 ); /* aspect_numerator */
1390     bs_read( &bitstream, 24 ); /* aspect_denominator */
1391
1392     p_stream->fmt.video.i_frame_rate = i_fps_numerator;
1393     p_stream->fmt.video.i_frame_rate_base = i_fps_denominator;
1394
1395     bs_read( &bitstream, 8 ); /* colorspace */
1396     p_stream->fmt.i_bitrate = bs_read( &bitstream, 24 );
1397     bs_read( &bitstream, 6 ); /* quality */
1398
1399     i_keyframe_frequency_force = 1 << bs_read( &bitstream, 5 );
1400
1401     /* granule_shift = i_log( frequency_force -1 ) */
1402     p_stream->i_granule_shift = 0;
1403     i_keyframe_frequency_force--;
1404     while( i_keyframe_frequency_force )
1405     {
1406         p_stream->i_granule_shift++;
1407         i_keyframe_frequency_force >>= 1;
1408     }
1409
1410     p_stream->f_rate = ((float)i_fps_numerator) / i_fps_denominator;
1411 }
1412
1413 static void Ogg_ReadVorbisHeader( logical_stream_t *p_stream,
1414                                   ogg_packet *p_oggpacket )
1415 {
1416     oggpack_buffer opb;
1417
1418     p_stream->fmt.i_cat = AUDIO_ES;
1419     p_stream->fmt.i_codec = VLC_FOURCC( 'v','o','r','b' );
1420
1421     /* Signal that we want to keep a backup of the vorbis
1422      * stream headers. They will be used when switching between
1423      * audio streams. */
1424     p_stream->b_force_backup = 1;
1425
1426     /* Cheat and get additionnal info ;) */
1427     oggpack_readinit( &opb, p_oggpacket->packet, p_oggpacket->bytes);
1428     oggpack_adv( &opb, 88 );
1429     p_stream->fmt.audio.i_channels = oggpack_read( &opb, 8 );
1430     p_stream->f_rate = p_stream->fmt.audio.i_rate =
1431         oggpack_read( &opb, 32 );
1432     oggpack_adv( &opb, 32 );
1433     p_stream->fmt.i_bitrate = oggpack_read( &opb, 32 );
1434 }
1435
1436 static void Ogg_ReadSpeexHeader( logical_stream_t *p_stream,
1437                                  ogg_packet *p_oggpacket )
1438 {
1439     oggpack_buffer opb;
1440
1441     p_stream->fmt.i_cat = AUDIO_ES;
1442     p_stream->fmt.i_codec = VLC_FOURCC( 's','p','x',' ' );
1443
1444     /* Signal that we want to keep a backup of the speex
1445      * stream headers. They will be used when switching between
1446      * audio streams. */
1447     p_stream->b_force_backup = 1;
1448
1449     /* Cheat and get additionnal info ;) */
1450     oggpack_readinit( &opb, p_oggpacket->packet, p_oggpacket->bytes);
1451     oggpack_adv( &opb, 224 );
1452     oggpack_adv( &opb, 32 ); /* speex_version_id */
1453     oggpack_adv( &opb, 32 ); /* header_size */
1454     p_stream->f_rate = p_stream->fmt.audio.i_rate = oggpack_read( &opb, 32 );
1455     oggpack_adv( &opb, 32 ); /* mode */
1456     oggpack_adv( &opb, 32 ); /* mode_bitstream_version */
1457     p_stream->fmt.audio.i_channels = oggpack_read( &opb, 32 );
1458     p_stream->fmt.i_bitrate = oggpack_read( &opb, 32 );
1459 }
1460
1461 static void Ogg_ReadFlacHeader( demux_t *p_demux, logical_stream_t *p_stream,
1462                                 ogg_packet *p_oggpacket )
1463 {
1464     /* Parse the STREAMINFO metadata */
1465     bs_t s;
1466
1467     bs_init( &s, p_oggpacket->packet, p_oggpacket->bytes );
1468
1469     bs_read( &s, 1 );
1470     if( bs_read( &s, 7 ) == 0 )
1471     {
1472         if( bs_read( &s, 24 ) >= 34 /*size STREAMINFO*/ )
1473         {
1474             bs_skip( &s, 80 );
1475             p_stream->f_rate = p_stream->fmt.audio.i_rate = bs_read( &s, 20 );
1476             p_stream->fmt.audio.i_channels = bs_read( &s, 3 ) + 1;
1477
1478             msg_Dbg( p_demux, "FLAC header, channels: %i, rate: %i",
1479                      p_stream->fmt.audio.i_channels, (int)p_stream->f_rate );
1480         }
1481         else msg_Dbg( p_demux, "FLAC STREAMINFO metadata too short" );
1482
1483         /* Fake this as the last metadata block */
1484         *((uint8_t*)p_oggpacket->packet) |= 0x80;
1485     }
1486     else
1487     {
1488         /* This ain't a STREAMINFO metadata */
1489         msg_Dbg( p_demux, "Invalid FLAC STREAMINFO metadata" );
1490     }
1491 }
1492
1493 static void Ogg_ReadKateHeader( logical_stream_t *p_stream,
1494                                 ogg_packet *p_oggpacket )
1495 {
1496     oggpack_buffer opb;
1497     int32_t gnum;
1498     int32_t gden;
1499     int n;
1500
1501     p_stream->fmt.i_cat = SPU_ES;
1502     p_stream->fmt.i_codec = VLC_FOURCC( 'k','a','t','e' );
1503
1504     /* Signal that we want to keep a backup of the kate
1505      * stream headers. They will be used when switching between
1506      * kate streams. */
1507     p_stream->b_force_backup = 1;
1508
1509     /* Cheat and get additionnal info ;) */
1510     oggpack_readinit( &opb, p_oggpacket->packet, p_oggpacket->bytes);
1511     oggpack_adv( &opb, 11*8 ); /* packet type, kate magic, version */
1512     p_stream->i_kate_num_headers = oggpack_read( &opb, 8 );
1513     oggpack_adv( &opb, 3*8 );
1514     p_stream->i_granule_shift = oggpack_read( &opb, 8 );
1515     oggpack_adv( &opb, 8*8 ); /* reserved */
1516     gnum = oggpack_read( &opb, 32 );
1517     gden = oggpack_read( &opb, 32 );
1518     p_stream->f_rate = (double)gnum/gden;
1519
1520     p_stream->fmt.psz_language = malloc(16);
1521     if (p_stream->fmt.psz_language)
1522     {
1523         for (n=0;n<16;++n)
1524             p_stream->fmt.psz_language[n] = oggpack_read(&opb,8);
1525         p_stream->fmt.psz_language[15] = 0; /* just in case */
1526     }
1527     else
1528     {
1529         for (n=0;n<16;++n)
1530             oggpack_read(&opb,8);
1531     }
1532     p_stream->fmt.psz_description = malloc(16);
1533     if (p_stream->fmt.psz_description)
1534     {
1535         for (n=0;n<16;++n)
1536             p_stream->fmt.psz_description[n] = oggpack_read(&opb,8);
1537         p_stream->fmt.psz_description[15] = 0; /* just in case */
1538     }
1539     else
1540     {
1541         for (n=0;n<16;++n)
1542             oggpack_read(&opb,8);
1543     }
1544 }
1545
1546 static void Ogg_ReadAnnodexHeader( vlc_object_t *p_this,
1547                                    logical_stream_t *p_stream,
1548                                    ogg_packet *p_oggpacket )
1549 {
1550     if( p_oggpacket->bytes >= 28 &&
1551         !memcmp( p_oggpacket->packet, "Annodex", 7 ) )
1552     {
1553         oggpack_buffer opb;
1554
1555         uint16_t major_version;
1556         uint16_t minor_version;
1557         uint64_t timebase_numerator;
1558         uint64_t timebase_denominator;
1559
1560         Ogg_ReadTheoraHeader( p_stream, p_oggpacket );
1561
1562         oggpack_readinit( &opb, p_oggpacket->packet, p_oggpacket->bytes);
1563         oggpack_adv( &opb, 8*8 ); /* "Annodex\0" header */
1564         major_version = oggpack_read( &opb, 2*8 ); /* major version */
1565         minor_version = oggpack_read( &opb, 2*8 ); /* minor version */
1566         timebase_numerator = GetQWLE( &p_oggpacket->packet[16] );
1567         timebase_denominator = GetQWLE( &p_oggpacket->packet[24] );
1568     }
1569     else if( p_oggpacket->bytes >= 42 &&
1570              !memcmp( p_oggpacket->packet, "AnxData", 7 ) )
1571     {
1572         uint64_t granule_rate_numerator;
1573         uint64_t granule_rate_denominator;
1574         char content_type_string[1024];
1575
1576         /* Read in Annodex header fields */
1577
1578         granule_rate_numerator = GetQWLE( &p_oggpacket->packet[8] );
1579         granule_rate_denominator = GetQWLE( &p_oggpacket->packet[16] );
1580         p_stream->secondary_header_packets =
1581             GetDWLE( &p_oggpacket->packet[24] );
1582
1583         /* we are guaranteed that the first header field will be
1584          * the content-type (by the Annodex standard) */
1585         content_type_string[0] = '\0';
1586         if( !strncasecmp( (char*)(&p_oggpacket->packet[28]), "Content-Type: ", 14 ) )
1587         {
1588             uint8_t *p = memchr( &p_oggpacket->packet[42], '\r',
1589                                  p_oggpacket->bytes - 1 );
1590             if( p && p[0] == '\r' && p[1] == '\n' )
1591                 sscanf( (char*)(&p_oggpacket->packet[42]), "%1024s\r\n",
1592                         content_type_string );
1593         }
1594
1595         msg_Dbg( p_this, "AnxData packet info: %"PRId64" / %"PRId64", %d, ``%s''",
1596                  granule_rate_numerator, granule_rate_denominator,
1597                  p_stream->secondary_header_packets, content_type_string );
1598
1599         p_stream->f_rate = (float) granule_rate_numerator /
1600             (float) granule_rate_denominator;
1601
1602         /* What type of file do we have?
1603          * strcmp is safe to use here because we've extracted
1604          * content_type_string from the stream manually */
1605         if( !strncmp(content_type_string, "audio/x-wav", 11) )
1606         {
1607             /* n.b. WAVs are unsupported right now */
1608             p_stream->fmt.i_cat = UNKNOWN_ES;
1609         }
1610         else if( !strncmp(content_type_string, "audio/x-vorbis", 14) )
1611         {
1612             p_stream->fmt.i_cat = AUDIO_ES;
1613             p_stream->fmt.i_codec = VLC_FOURCC( 'v','o','r','b' );
1614
1615             p_stream->b_force_backup = 1;
1616         }
1617         else if( !strncmp(content_type_string, "audio/x-speex", 14) )
1618         {
1619             p_stream->fmt.i_cat = AUDIO_ES;
1620             p_stream->fmt.i_codec = VLC_FOURCC( 's','p','x',' ' );
1621
1622             p_stream->b_force_backup = 1;
1623         }
1624         else if( !strncmp(content_type_string, "video/x-theora", 14) )
1625         {
1626             p_stream->fmt.i_cat = VIDEO_ES;
1627             p_stream->fmt.i_codec = VLC_FOURCC( 't','h','e','o' );
1628
1629             p_stream->b_force_backup = 1;
1630         }
1631         else if( !strncmp(content_type_string, "video/x-xvid", 14) )
1632         {
1633             p_stream->fmt.i_cat = VIDEO_ES;
1634             p_stream->fmt.i_codec = VLC_FOURCC( 'x','v','i','d' );
1635
1636             p_stream->b_force_backup = 1;
1637         }
1638         else if( !strncmp(content_type_string, "video/mpeg", 14) )
1639         {
1640             /* n.b. MPEG streams are unsupported right now */
1641             p_stream->fmt.i_cat = VIDEO_ES;
1642             p_stream->fmt.i_codec = VLC_FOURCC( 'm','p','g','v' );
1643         }
1644         else if( !strncmp(content_type_string, "text/x-cmml", 11) )
1645         {
1646             ogg_stream_packetout( &p_stream->os, p_oggpacket );
1647             p_stream->fmt.i_cat = SPU_ES;
1648             p_stream->fmt.i_codec = VLC_FOURCC( 'c','m','m','l' );
1649         }
1650     }
1651 }
1652
1653 /* every packet[1] in the stream contains a picture, there may
1654  * be header cruft infront of it though
1655  * [1] EXCEPT the BOS page/packet */
1656 static uint32_t Ogg_ReadDiracPictureNumber( ogg_packet *p_oggpacket )
1657 {
1658     uint32_t u_pos = 4;
1659     /* protect against falling off the edge */
1660     while ( u_pos + 13 < p_oggpacket->bytes ) {
1661         /* find the picture startcode */
1662         if ( p_oggpacket->packet[u_pos] & 0x08 ) {
1663             return GetDWBE( p_oggpacket->packet + u_pos + 9 );
1664         }
1665         /* skip to the next dirac parse unit */
1666         uint32_t u_npo = GetDWBE( p_oggpacket->packet + u_pos + 1 );
1667         if (u_npo == 0)
1668             u_npo = 13;
1669         u_pos += u_npo;
1670     }
1671     return -1;
1672 }
1673
1674 static uint32_t dirac_uint( bs_t *p_bs )
1675 {
1676   uint32_t count = 0, value = 0;
1677   while( !bs_read ( p_bs, 1 ) ) {
1678     count++;
1679     value <<= 1;
1680     value |= bs_read ( p_bs, 1 );
1681   }
1682
1683   return (1<<count) - 1 + value;
1684 }
1685
1686 static int dirac_bool( bs_t *p_bs )
1687 {
1688     return bs_read ( p_bs, 1 );
1689 }
1690
1691 static void Ogg_ReadDiracHeader( logical_stream_t *p_stream,
1692                                  ogg_packet *p_oggpacket )
1693 {
1694     bs_t bs;
1695
1696     p_stream->fmt.i_cat = VIDEO_ES;
1697     p_stream->fmt.i_codec = VLC_FOURCC( 'd','r','a','c' );
1698     p_stream->i_granule_shift = 32;
1699
1700     /* Backing up stream headers is not required -- seqhdrs are repeated
1701      * thoughout the stream at suitable decoding start points */
1702     p_stream->b_force_backup = 0;
1703
1704     /* read in useful bits from sequence header */
1705     bs_init( &bs, p_oggpacket->packet, p_oggpacket->bytes );
1706     bs_skip( &bs, 13*8); /* parse_info_header */
1707     dirac_uint( &bs ); /* major_version */
1708     dirac_uint( &bs ); /* minor_version */
1709     dirac_uint( &bs ); /* profile */
1710     dirac_uint( &bs ); /* level */
1711
1712     uint32_t u_video_format = dirac_uint( &bs ); /* index */
1713
1714     if (dirac_bool( &bs )) {
1715         dirac_uint( &bs ); /* frame_width */
1716         dirac_uint( &bs ); /* frame_height */
1717     }
1718
1719     if (dirac_bool( &bs )) {
1720         dirac_uint( &bs ); /* chroma_format */
1721     }
1722     if (dirac_bool( &bs )) {
1723         if (dirac_bool( &bs )) { /* interlaced */
1724             dirac_bool( &bs ); /* top_field_first */
1725         }
1726     }
1727
1728     static const struct {
1729         uint32_t u_n /* numerator */, u_d /* denominator */;
1730     } dirac_frate_tbl[] = { /* table 10.3 */
1731         {1,1}, /* this first value is never used */
1732         {24000,1001}, {24,1}, {25,1}, {30000,1001}, {30,1},
1733         {50,1}, {60000,1001}, {60,1}, {15000,1001}, {25,2},
1734     };
1735
1736     static const uint32_t dirac_vidfmt_frate[] = { /* table C.1 */
1737         1, 9, 10, 9, 10, 9, 10, 4, 3, 7, 6, 4, 3, 7, 6, 2, 2, 7, 6, 7, 6,
1738     };
1739
1740     uint32_t u_n = dirac_frate_tbl[dirac_vidfmt_frate[u_video_format]].u_n;
1741     uint32_t u_d = dirac_frate_tbl[dirac_vidfmt_frate[u_video_format]].u_d;
1742     if (dirac_bool( &bs )) {
1743         uint32_t frame_rate_index = dirac_uint( &bs );
1744         u_n = dirac_frate_tbl[frame_rate_index].u_n;
1745         u_d = dirac_frate_tbl[frame_rate_index].u_d;
1746         if (frame_rate_index == 0) {
1747             u_n = dirac_uint( &bs ); /* frame_rate_numerator */
1748             u_d = dirac_uint( &bs ); /* frame_rate_denominator */
1749         }
1750     }
1751     p_stream->f_rate = (float) u_n / u_d;
1752 }