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_bos;
 115     int     i_eos;
 116
 117     /* bitrate */
 118     int     i_bitrate;
 119
 120     /* after reading all headers, the first data page is stuffed into the relevant stream, ready to use */
 121     bool    b_page_waiting;
 122 };
 123
 124 /* OggDS headers for the new header format (used in ogm files) */
 125 typedef struct
 126 {
 127     ogg_int32_t width;
 128     ogg_int32_t height;
 129 } stream_header_video_t;
 130
 131 typedef struct
 132 {
 133     ogg_int16_t channels;
 134     ogg_int16_t padding;
 135     ogg_int16_t blockalign;
 136     ogg_int32_t avgbytespersec;
 137 } stream_header_audio_t;
 138
 139 typedef struct
 140 {
 141     char        streamtype[8];
 142     char        subtype[4];
 143
 144     ogg_int32_t size;                               /* size of the structure */
 145
 146     ogg_int64_t time_unit;                              /* in reference time */
 147     ogg_int64_t samples_per_unit;
 148     ogg_int32_t default_len;                                /* in media time */
 149
 150     ogg_int32_t buffersize;
 151     ogg_int16_t bits_per_sample;
 152     ogg_int16_t padding;
 153
 154     union
 155     {
 156         /* Video specific */
 157         stream_header_video_t video;
 158         /* Audio specific */
 159         stream_header_audio_t audio;
 160     } sh;
 161 } stream_header_t;
 162
 163 #define OGG_BLOCK_SIZE 4096
 164
 165 /* Some defines from OggDS */
 166 #define PACKET_TYPE_HEADER   0x01
 167 #define PACKET_TYPE_BITS     0x07
 168 #define PACKET_LEN_BITS01    0xc0
 169 #define PACKET_LEN_BITS2     0x02
 170 #define PACKET_IS_SYNCPOINT  0x08
 171
 172 /*****************************************************************************
 173  * Local prototypes
 174  *****************************************************************************/
 175 static int  Demux  ( demux_t * );
 176 static int  Control( demux_t *, int, va_list );
 177
 178 /* Bitstream manipulation */
 179 static int  Ogg_ReadPage     ( demux_t *, ogg_page * );
 180 static void Ogg_UpdatePCR    ( logical_stream_t *, ogg_packet * );
 181 static void Ogg_DecodePacket ( demux_t *, logical_stream_t *, ogg_packet * );
 182
 183 static int Ogg_BeginningOfStream( demux_t *p_demux );
 184 static int Ogg_FindLogicalStreams( demux_t *p_demux );
 185 static void Ogg_EndOfStream( demux_t *p_demux );
 186
 187 /* */
 188 static void Ogg_LogicalStreamDelete( demux_t *p_demux, logical_stream_t *p_stream );
 189 static bool Ogg_LogicalStreamResetEsFormat( demux_t *p_demux, logical_stream_t *p_stream );
 190
 191 /* Logical bitstream headers */
 192 static void Ogg_ReadTheoraHeader( logical_stream_t *, ogg_packet * );
 193 static void Ogg_ReadVorbisHeader( logical_stream_t *, ogg_packet * );
 194 static void Ogg_ReadSpeexHeader( logical_stream_t *, ogg_packet * );
 195 static void Ogg_ReadKateHeader( logical_stream_t *, ogg_packet * );
 196 static void Ogg_ReadFlacHeader( demux_t *, logical_stream_t *, ogg_packet * );
 197 static void Ogg_ReadAnnodexHeader( vlc_object_t *, logical_stream_t *, ogg_packet * );
 198 static void Ogg_ReadDiracHeader( logical_stream_t *, ogg_packet * );
 199
 200 /*****************************************************************************
 201  * Open: initializes ogg demux structures
 202  *****************************************************************************/
 203 static int Open( vlc_object_t * p_this )
 204 {
 205     demux_t *p_demux = (demux_t *)p_this;
 206     demux_sys_t    *p_sys;
 207     const uint8_t  *p_peek;
 208
 209
 210     /* Check if we are dealing with an ogg stream */
 211     if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 ) return VLC_EGENERIC;
 212     if( !p_demux->b_force && memcmp( p_peek, "OggS", 4 ) )
 213     {
 214         return VLC_EGENERIC;
 215     }
 216
 217     /* Set exported functions */
 218     p_demux->pf_demux = Demux;
 219     p_demux->pf_control = Control;
 220     p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
 221     if( !p_sys )
 222         return VLC_ENOMEM;
 223
 224     memset( p_sys, 0, sizeof( demux_sys_t ) );
 225     p_sys->i_bitrate = 0;
 226     p_sys->pp_stream = NULL;
 227     p_sys->p_old_stream = NULL;
 228
 229     /* Begnning of stream, tell the demux to look for elementary streams. */
 230     p_sys->i_bos = 0;
 231     p_sys->i_eos = 0;
 232
 233     /* Initialize the Ogg physical bitstream parser */
 234     ogg_sync_init( &p_sys->oy );
 235     p_sys->b_page_waiting = false;
 236
 237     return VLC_SUCCESS;
 238 }
 239
 240 /*****************************************************************************
 241  * Close: frees unused data
 242  *****************************************************************************/
 243 static void Close( vlc_object_t *p_this )
 244 {
 245     demux_t *p_demux = (demux_t *)p_this;
 246     demux_sys_t *p_sys = p_demux->p_sys  ;
 247
 248     /* Cleanup the bitstream parser */
 249     ogg_sync_clear( &p_sys->oy );
 250
 251     Ogg_EndOfStream( p_demux );
 252
 253     if( p_sys->p_old_stream )
 254         Ogg_LogicalStreamDelete( p_demux, p_sys->p_old_stream );
 255
 256     free( p_sys );
 257 }
 258
 259 /*****************************************************************************
 260  * Demux: reads and demuxes data packets
 261  *****************************************************************************
 262  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 263  *****************************************************************************/
 264 static int Demux( demux_t * p_demux )
 265 {
 266     demux_sys_t *p_sys = p_demux->p_sys;
 267     ogg_page    oggpage;
 268     ogg_packet  oggpacket;
 269     int         i_stream;
 270
 271
 272     if( p_sys->i_eos == p_sys->i_streams )
 273     {
 274         if( p_sys->i_eos )
 275         {
 276             msg_Dbg( p_demux, "end of a group of logical streams" );
 277             /* We keep the ES to try reusing it in Ogg_BeginningOfStream
 278              * only 1 ES is supported (common case for ogg web radio) */
 279             if( p_sys->i_streams == 1 )
 280             {
 281                 p_sys->p_old_stream = p_sys->pp_stream[0];
 282                 TAB_CLEAN( p_sys->i_streams, p_sys->pp_stream );
 283             }
 284             Ogg_EndOfStream( p_demux );
 285         }
 286
 287         p_sys->i_eos = 0;
 288         if( Ogg_BeginningOfStream( p_demux ) != VLC_SUCCESS )
 289             return 0;
 290
 291         msg_Dbg( p_demux, "beginning of a group of logical streams" );
 292         es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
 293     }
 294
 295     /*
 296      * The first data page of a physical stream is stored in the relevant logical stream
 297      * in Ogg_FindLogicalStreams. Therefore, we must not read a page and only update the
 298      * stream it belongs to if we haven't processed this first page yet. If we do, we
 299      * will only process that first page whenever we find the second page for this stream.
 300      * While this is fine for Vorbis and Theora, which are continuous codecs, which means
 301      * the second page will arrive real quick, this is not fine for Kate, whose second
 302      * data page will typically arrive much later.
 303      * This means it is now possible to seek right at the start of a stream where the last
 304      * logical stream is Kate, without having to wait for the second data page to unblock
 305      * the first one, which is the one that triggers the 'no more headers to backup' code.
 306      * And, as we all know, seeking without having backed up all headers is bad, since the
 307      * codec will fail to initialize if it's missing its headers.
 308      */
 309     if( !p_sys->b_page_waiting)
 310     {
 311         /*
 312          * Demux an ogg page from the stream
 313          */
 314         if( Ogg_ReadPage( p_demux, &oggpage ) != VLC_SUCCESS )
 315         {
 316             return 0; /* EOF */
 317         }
 318
 319         /* Test for End of Stream */
 320         if( ogg_page_eos( &oggpage ) ) p_sys->i_eos++;
 321     }
 322
 323
 324     for( i_stream = 0; i_stream < p_sys->i_streams; i_stream++ )
 325     {
 326         logical_stream_t *p_stream = p_sys->pp_stream[i_stream];
 327
 328         /* if we've just pulled page, look for the right logical stream */
 329         if( !p_sys->b_page_waiting )
 330         {
 331             if( ogg_stream_pagein( &p_stream->os, &oggpage ) != 0 )
 332                 continue;
 333         }
 334
 335         while( ogg_stream_packetout( &p_stream->os, &oggpacket ) > 0 )
 336         {
 337             /* Read info from any secondary header packets, if there are any */
 338             if( p_stream->secondary_header_packets > 0 )
 339             {
 340                 if( p_stream->fmt.i_codec == VLC_FOURCC('t','h','e','o') &&
 341                         oggpacket.bytes >= 7 &&
 342                         ! memcmp( oggpacket.packet, "\x80theora", 7 ) )
 343                 {
 344                     Ogg_ReadTheoraHeader( p_stream, &oggpacket );
 345                     p_stream->secondary_header_packets = 0;
 346                 }
 347                 else if( p_stream->fmt.i_codec == VLC_FOURCC('v','o','r','b') &&
 348                         oggpacket.bytes >= 7 &&
 349                         ! memcmp( oggpacket.packet, "\x01vorbis", 7 ) )
 350                 {
 351                     Ogg_ReadVorbisHeader( p_stream, &oggpacket );
 352                     p_stream->secondary_header_packets = 0;
 353                 }
 354                 else if ( p_stream->fmt.i_codec == VLC_FOURCC('c','m','m','l') )
 355                 {
 356                     p_stream->secondary_header_packets = 0;
 357                 }
 358             }
 359
 360             if( p_stream->b_reinit )
 361             {
 362                 /* If synchro is re-initialized we need to drop all the packets
 363                  * until we find a new dated one. */
 364                 Ogg_UpdatePCR( p_stream, &oggpacket );
 365
 366                 if( p_stream->i_pcr >= 0 )
 367                 {
 368                     p_stream->b_reinit = 0;
 369                 }
 370                 else
 371                 {
 372                     p_stream->i_interpolated_pcr = -1;
 373                     continue;
 374                 }
 375
 376                 /* An Ogg/vorbis packet contains an end date granulepos */
 377                 if( p_stream->fmt.i_codec == VLC_FOURCC( 'v','o','r','b' ) ||
 378                     p_stream->fmt.i_codec == VLC_FOURCC( 's','p','x',' ' ) ||
 379                     p_stream->fmt.i_codec == VLC_FOURCC( 'f','l','a','c' ) )
 380                 {
 381                     if( ogg_stream_packetout( &p_stream->os, &oggpacket ) > 0 )
 382                     {
 383                         Ogg_DecodePacket( p_demux, p_stream, &oggpacket );
 384                     }
 385                     else
 386                     {
 387                         es_out_Control( p_demux->out, ES_OUT_SET_PCR,
 388                                         p_stream->i_pcr );
 389                     }
 390                     continue;
 391                 }
 392             }
 393
 394             Ogg_DecodePacket( p_demux, p_stream, &oggpacket );
 395         }
 396
 397         if( !p_sys->b_page_waiting )
 398         {
 399             break;
 400         }
 401     }
 402
 403     /* if a page was waiting, it's now processed */
 404     p_sys->b_page_waiting = false;
 405
 406     i_stream = 0; p_sys->i_pcr = -1;
 407     for( ; i_stream < p_sys->i_streams; i_stream++ )
 408     {
 409         logical_stream_t *p_stream = p_sys->pp_stream[i_stream];
 410
 411         if( p_stream->fmt.i_cat == SPU_ES )
 412             continue;
 413         if( p_stream->i_interpolated_pcr < 0 )
 414             continue;
 415
 416         if( p_sys->i_pcr < 0 || p_stream->i_interpolated_pcr < p_sys->i_pcr )
 417             p_sys->i_pcr = p_stream->i_interpolated_pcr;
 418     }
 419
 420     if( p_sys->i_pcr >= 0 )
 421     {
 422         es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_pcr );
 423     }
 424
 425     return 1;
 426 }
 427
 428 /*****************************************************************************
 429  * Control:
 430  *****************************************************************************/
 431 static int Control( demux_t *p_demux, int i_query, va_list args )
 432 {
 433     demux_sys_t *p_sys  = p_demux->p_sys;
 434     int64_t *pi64;
 435     bool *pb_bool;
 436     int i;
 437
 438     switch( i_query )
 439     {
 440         case DEMUX_HAS_UNSUPPORTED_META:
 441             pb_bool = (bool*)va_arg( args, bool* );
 442             *pb_bool = true;
 443             return VLC_SUCCESS;
 444
 445         case DEMUX_GET_TIME:
 446             pi64 = (int64_t*)va_arg( args, int64_t * );
 447             *pi64 = p_sys->i_pcr;
 448             return VLC_SUCCESS;
 449
 450         case DEMUX_SET_TIME:
 451             return VLC_EGENERIC;
 452
 453         case DEMUX_SET_POSITION:
 454             /* forbid seeking if we haven't initialized all logical bitstreams yet;
 455                if we allowed, some headers would not get backed up and decoder init
 456                would fail, making that logical stream unusable */
 457             if( p_sys->i_bos > 0 )
 458             {
 459                 return VLC_EGENERIC;
 460             }
 461
 462             for( i = 0; i < p_sys->i_streams; i++ )
 463             {
 464                 logical_stream_t *p_stream = p_sys->pp_stream[i];
 465
 466                 /* we'll trash all the data until we find the next pcr */
 467                 p_stream->b_reinit = 1;
 468                 p_stream->i_pcr = -1;
 469                 p_stream->i_interpolated_pcr = -1;
 470                 ogg_stream_reset( &p_stream->os );
 471             }
 472             ogg_sync_reset( &p_sys->oy );
 473             /* suspicious lack of break - reading the code, I believe it's intended though */
 474
 475         default:
 476             return demux_vaControlHelper( p_demux->s, 0, -1, p_sys->i_bitrate,
 477                                            1, i_query, args );
 478     }
 479 }
 480
 481 /****************************************************************************
 482  * Ogg_ReadPage: Read a full Ogg page from the physical bitstream.
 483  ****************************************************************************
 484  * Returns VLC_SUCCESS if a page has been read. An error might happen if we
 485  * are at the end of stream.
 486  ****************************************************************************/
 487 static int Ogg_ReadPage( demux_t *p_demux, ogg_page *p_oggpage )
 488 {
 489     demux_sys_t *p_ogg = p_demux->p_sys  ;
 490     int i_read = 0;
 491     char *p_buffer;
 492
 493     while( ogg_sync_pageout( &p_ogg->oy, p_oggpage ) != 1 )
 494     {
 495         p_buffer = ogg_sync_buffer( &p_ogg->oy, OGG_BLOCK_SIZE );
 496
 497         i_read = stream_Read( p_demux->s, p_buffer, OGG_BLOCK_SIZE );
 498         if( i_read <= 0 )
 499             return VLC_EGENERIC;
 500
 501         ogg_sync_wrote( &p_ogg->oy, i_read );
 502     }
 503
 504     return VLC_SUCCESS;
 505 }
 506
 507 /****************************************************************************
 508  * Ogg_UpdatePCR: update the PCR (90kHz program clock reference) for the
 509  *                current stream.
 510  ****************************************************************************/
 511 static void Ogg_UpdatePCR( logical_stream_t *p_stream,
 512                            ogg_packet *p_oggpacket )
 513 {
 514     /* Convert the granulepos into a pcr */
 515     if( p_oggpacket->granulepos >= 0 )
 516     {
 517         if( p_stream->fmt.i_codec == VLC_FOURCC( 't','h','e','o' ) ||
 518             p_stream->fmt.i_codec == VLC_FOURCC( 'k','a','t','e' ) )
 519         {
 520             ogg_int64_t iframe = p_oggpacket->granulepos >>
 521               p_stream->i_granule_shift;
 522             ogg_int64_t pframe = p_oggpacket->granulepos -
 523               ( iframe << p_stream->i_granule_shift );
 524
 525             p_stream->i_pcr = ( iframe + pframe ) * INT64_C(1000000)
 526                               / p_stream->f_rate;
 527         }
 528         else if( p_stream->fmt.i_codec == VLC_FOURCC( 'd','r','a','c' ) )
 529         {
 530             ogg_int64_t i_dts = p_oggpacket->granulepos >> 31;
 531             /* NB, OggDirac granulepos values are in units of 2*picturerate */
 532             p_stream->i_pcr = (i_dts/2) * INT64_C(1000000) / p_stream->f_rate;
 533         }
 534         else
 535         {
 536             p_stream->i_pcr = p_oggpacket->granulepos * INT64_C(1000000)
 537                               / p_stream->f_rate;
 538         }
 539
 540         p_stream->i_interpolated_pcr = p_stream->i_pcr;
 541     }
 542     else
 543     {
 544         p_stream->i_pcr = -1;
 545
 546         /* no granulepos available, try to interpolate the pcr.
 547          * If we can't then don't touch the old value. */
 548         if( p_stream->fmt.i_cat == VIDEO_ES )
 549             /* 1 frame per packet */
 550             p_stream->i_interpolated_pcr += (INT64_C(1000000) / p_stream->f_rate);
 551         else if( p_stream->fmt.i_bitrate )
 552             p_stream->i_interpolated_pcr +=
 553                 ( p_oggpacket->bytes * INT64_C(1000000) /
 554                   p_stream->fmt.i_bitrate / 8 );
 555     }
 556 }
 557
 558 /****************************************************************************
 559  * Ogg_DecodePacket: Decode an Ogg packet.
 560  ****************************************************************************/
 561 static void Ogg_DecodePacket( demux_t *p_demux,
 562                               logical_stream_t *p_stream,
 563                               ogg_packet *p_oggpacket )
 564 {
 565     block_t *p_block;
 566     bool b_selected;
 567     int i_header_len = 0;
 568     mtime_t i_pts = -1, i_interpolated_pts;
 569     demux_sys_t *p_ogg = p_demux->p_sys;
 570
 571     /* Sanity check */
 572     if( !p_oggpacket->bytes )
 573     {
 574         msg_Dbg( p_demux, "discarding 0 sized packet" );
 575         return;
 576     }
 577
 578     if( p_oggpacket->bytes >= 7 &&
 579         ! memcmp ( p_oggpacket->packet, "Annodex", 7 ) )
 580     {
 581         /* it's an Annodex packet -- skip it (do nothing) */
 582         return;
 583     }
 584     else if( p_oggpacket->bytes >= 7 &&
 585         ! memcmp ( p_oggpacket->packet, "AnxData", 7 ) )
 586     {
 587         /* it's an AnxData packet -- skip it (do nothing) */
 588         return;
 589     }
 590
 591     if( p_stream->fmt.i_codec == VLC_FOURCC( 's','u','b','t' ) &&
 592         p_oggpacket->packet[0] & PACKET_TYPE_BITS ) return;
 593
 594     /* Check the ES is selected */
 595     es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
 596                     p_stream->p_es, &b_selected );
 597
 598     if( p_stream->b_force_backup )
 599     {
 600         uint8_t *p_sav;
 601         bool b_store_size = true;
 602         bool b_store_num_headers = false;
 603
 604         p_stream->i_packets_backup++;
 605         switch( p_stream->fmt.i_codec )
 606         {
 607         case VLC_FOURCC( 'v','o','r','b' ):
 608         case VLC_FOURCC( 's','p','x',' ' ):
 609         case VLC_FOURCC( 't','h','e','o' ):
 610             if( p_stream->i_packets_backup == 3 ) p_stream->b_force_backup = 0;
 611             break;
 612
 613         case VLC_FOURCC( 'f','l','a','c' ):
 614             if( !p_stream->fmt.audio.i_rate && p_stream->i_packets_backup == 2 )
 615             {
 616                 Ogg_ReadFlacHeader( p_demux, p_stream, p_oggpacket );
 617                 p_stream->b_force_backup = 0;
 618             }
 619             else if( p_stream->fmt.audio.i_rate )
 620             {
 621                 p_stream->b_force_backup = 0;
 622                 if( p_oggpacket->bytes >= 9 )
 623                 {
 624                     p_oggpacket->packet += 9;
 625                     p_oggpacket->bytes -= 9;
 626                 }
 627             }
 628             b_store_size = false;
 629             break;
 630
 631         case VLC_FOURCC( 'k','a','t','e' ):
 632             if( p_stream->i_packets_backup == 1)
 633                 b_store_num_headers = true;
 634             if( p_stream->i_packets_backup == p_stream->i_kate_num_headers ) p_stream->b_force_backup = 0;
 635             break;
 636
 637         default:
 638             p_stream->b_force_backup = 0;
 639             break;
 640         }
 641
 642         /* Backup the ogg packet (likely an header packet) */
 643         p_stream->p_headers =
 644             realloc( p_sav = p_stream->p_headers, p_stream->i_headers +
 645                      p_oggpacket->bytes + (b_store_size ? 2 : 0) + (b_store_num_headers ? 1 : 0) );
 646         if( p_stream->p_headers )
 647         {
 648             uint8_t *p_extra = p_stream->p_headers + p_stream->i_headers;
 649
 650             if( b_store_num_headers )
 651             {
 652                 /* Kate streams store the number of headers in the first header,
 653                    so we can't just test for 3 as Vorbis/Theora */
 654                 *(p_extra++) = p_stream->i_kate_num_headers;
 655             }
 656             if( b_store_size )
 657             {
 658                 *(p_extra++) = p_oggpacket->bytes >> 8;
 659                 *(p_extra++) = p_oggpacket->bytes & 0xFF;
 660             }
 661             memcpy( p_extra, p_oggpacket->packet, p_oggpacket->bytes );
 662             p_stream->i_headers += p_oggpacket->bytes + (b_store_size ? 2 : 0) + (b_store_num_headers ? 1 : 0);
 663
 664             if( !p_stream->b_force_backup )
 665             {
 666                 /* Last header received, commit changes */
 667                 free( p_stream->fmt.p_extra );
 668
 669                 p_stream->fmt.i_extra = p_stream->i_headers;
 670                 p_stream->fmt.p_extra = malloc( p_stream->i_headers );
 671                 if( p_stream->fmt.p_extra )
 672                     memcpy( p_stream->fmt.p_extra, p_stream->p_headers,
 673                             p_stream->i_headers );
 674                 else
 675                     p_stream->fmt.i_extra = 0;
 676
 677                 if( Ogg_LogicalStreamResetEsFormat( p_demux, p_stream ) )
 678                     es_out_Control( p_demux->out, ES_OUT_SET_ES_FMT,
 679                                     p_stream->p_es, &p_stream->fmt );
 680
 681                 /* we're not at BOS anymore for this logical stream */
 682                 p_ogg->i_bos--;
 683             }
 684         }
 685         else
 686         {
 687                 p_stream->p_headers = p_sav;
 688         }
 689
 690         b_selected = false; /* Discard the header packet */
 691     }
 692
 693     /* Convert the pcr into a pts */
 694     if( p_stream->fmt.i_codec == VLC_FOURCC( 'v','o','r','b' ) ||
 695         p_stream->fmt.i_codec == VLC_FOURCC( 's','p','x',' ' ) ||
 696         p_stream->fmt.i_codec == VLC_FOURCC( 'f','l','a','c' ) )
 697     {
 698         if( p_stream->i_pcr >= 0 )
 699         {
 700             /* This is for streams where the granulepos of the header packets
 701              * doesn't match these of the data packets (eg. ogg web radios). */
 702             if( p_stream->i_previous_pcr == 0 &&
 703                 p_stream->i_pcr  > 3 * DEFAULT_PTS_DELAY )
 704             {
 705                 es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
 706
 707                 /* Call the pace control */
 708                 es_out_Control( p_demux->out, ES_OUT_SET_PCR,
 709                                 p_stream->i_pcr );
 710             }
 711
 712             p_stream->i_previous_pcr = p_stream->i_pcr;
 713
 714             /* The granulepos is the end date of the sample */
 715             i_pts =  p_stream->i_pcr;
 716         }
 717     }
 718
 719     /* Convert the granulepos into the next pcr */
 720     i_interpolated_pts = p_stream->i_interpolated_pcr;
 721     Ogg_UpdatePCR( p_stream, p_oggpacket );
 722
 723     /* SPU streams are typically discontinuous, do not mind large gaps */
 724     if( p_stream->fmt.i_cat != SPU_ES )
 725     {
 726         if( p_stream->i_pcr >= 0 )
 727         {
 728             /* This is for streams where the granulepos of the header packets
 729              * doesn't match these of the data packets (eg. ogg web radios). */
 730             if( p_stream->i_previous_pcr == 0 &&
 731                 p_stream->i_pcr  > 3 * DEFAULT_PTS_DELAY )
 732             {
 733                 es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
 734
 735                 /* Call the pace control */
 736                 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_stream->i_pcr );
 737             }
 738         }
 739     }
 740
 741     if( p_stream->fmt.i_codec != VLC_FOURCC( 'v','o','r','b' ) &&
 742         p_stream->fmt.i_codec != VLC_FOURCC( 's','p','x',' ' ) &&
 743         p_stream->fmt.i_codec != VLC_FOURCC( 'f','l','a','c' ) &&
 744         p_stream->i_pcr >= 0 )
 745     {
 746         p_stream->i_previous_pcr = p_stream->i_pcr;
 747
 748         /* The granulepos is the start date of the sample */
 749         i_pts = p_stream->i_pcr;
 750     }
 751
 752     if( !b_selected )
 753     {
 754         /* This stream isn't currently selected so we don't need to decode it,
 755          * but we did need to store its pcr as it might be selected later on */
 756         return;
 757     }
 758
 759     if( p_oggpacket->bytes <= 0 )
 760         return;
 761
 762     if( !( p_block = block_New( p_demux, p_oggpacket->bytes ) ) ) return;
 763
 764     /* Normalize PTS */
 765     if( i_pts == 0 ) i_pts = 1;
 766     else if( i_pts == -1 && i_interpolated_pts == 0 ) i_pts = 1;
 767     else if( i_pts == -1 ) i_pts = 0;
 768
 769     if( p_stream->fmt.i_cat == AUDIO_ES )
 770         p_block->i_dts = p_block->i_pts = i_pts;
 771     else if( p_stream->fmt.i_cat == SPU_ES )
 772     {
 773         p_block->i_dts = p_block->i_pts = i_pts;
 774         p_block->i_length = 0;
 775     }
 776     else if( p_stream->fmt.i_codec == VLC_FOURCC( 't','h','e','o' ) )
 777         p_block->i_dts = p_block->i_pts = i_pts;
 778     else if( p_stream->fmt.i_codec == VLC_FOURCC( 'd','r','a','c' ) )
 779     {
 780         ogg_int64_t dts = p_oggpacket->granulepos >> 31;
 781         ogg_int64_t delay = (p_oggpacket->granulepos >> 9) & 0x1fff;
 782
 783         uint64_t u_pnum = dts + delay;
 784
 785         p_block->i_dts = p_stream->i_pcr;
 786         p_block->i_pts = 0;
 787         /* NB, OggDirac granulepos values are in units of 2*picturerate */
 788         if( -1 != p_oggpacket->granulepos )
 789             p_block->i_pts = u_pnum * INT64_C(1000000) / p_stream->f_rate / 2;
 790     }
 791     else
 792     {
 793         p_block->i_dts = i_pts;
 794         p_block->i_pts = 0;
 795     }
 796
 797     if( p_stream->fmt.i_codec != VLC_FOURCC( 'v','o','r','b' ) &&
 798         p_stream->fmt.i_codec != VLC_FOURCC( 's','p','x',' ' ) &&
 799         p_stream->fmt.i_codec != VLC_FOURCC( 'f','l','a','c' ) &&
 800         p_stream->fmt.i_codec != VLC_FOURCC( 't','a','r','k' ) &&
 801         p_stream->fmt.i_codec != VLC_FOURCC( 't','h','e','o' ) &&
 802         p_stream->fmt.i_codec != VLC_FOURCC( 'c','m','m','l' ) &&
 803         p_stream->fmt.i_codec != VLC_FOURCC( 'd','r','a','c' ) &&
 804         p_stream->fmt.i_codec != VLC_FOURCC( 'k','a','t','e' ) )
 805     {
 806         /* We remove the header from the packet */
 807         i_header_len = (*p_oggpacket->packet & PACKET_LEN_BITS01) >> 6;
 808         i_header_len |= (*p_oggpacket->packet & PACKET_LEN_BITS2) << 1;
 809
 810         if( p_stream->fmt.i_codec == VLC_FOURCC( 's','u','b','t' ))
 811         {
 812             /* But with subtitles we need to retrieve the duration first */
 813             int i, lenbytes = 0;
 814
 815             if( i_header_len > 0 && p_oggpacket->bytes >= i_header_len + 1 )
 816             {
 817                 for( i = 0, lenbytes = 0; i < i_header_len; i++ )
 818                 {
 819                     lenbytes = lenbytes << 8;
 820                     lenbytes += *(p_oggpacket->packet + i_header_len - i);
 821                 }
 822             }
 823             if( p_oggpacket->bytes - 1 - i_header_len > 2 ||
 824                 ( p_oggpacket->packet[i_header_len + 1] != ' ' &&
 825                   p_oggpacket->packet[i_header_len + 1] != 0 &&
 826                   p_oggpacket->packet[i_header_len + 1] != '\n' &&
 827                   p_oggpacket->packet[i_header_len + 1] != '\r' ) )
 828             {
 829                 p_block->i_length = (mtime_t)lenbytes * 1000;
 830             }
 831         }
 832
 833         i_header_len++;
 834         if( p_block->i_buffer >= (unsigned int)i_header_len )
 835             p_block->i_buffer -= i_header_len;
 836         else
 837             p_block->i_buffer = 0;
 838     }
 839
 840     if( p_stream->fmt.i_codec == VLC_FOURCC( 't','a','r','k' ) )
 841     {
 842         /* FIXME: the biggest hack I've ever done */
 843         msg_Warn( p_demux, "tarkin pts: %"PRId64", granule: %"PRId64,
 844                   p_block->i_pts, p_block->i_dts );
 845         msleep(10000);
 846     }
 847
 848     memcpy( p_block->p_buffer, p_oggpacket->packet + i_header_len,
 849             p_oggpacket->bytes - i_header_len );
 850
 851     es_out_Send( p_demux->out, p_stream->p_es, p_block );
 852 }
 853
 854 /****************************************************************************
 855  * Ogg_FindLogicalStreams: Find the logical streams embedded in the physical
 856  *                         stream and fill p_ogg.
 857  *****************************************************************************
 858  * The initial page of a logical stream is marked as a 'bos' page.
 859  * Furthermore, the Ogg specification mandates that grouped bitstreams begin
 860  * together and all of the initial pages must appear before any data pages.
 861  *
 862  * On success this function returns VLC_SUCCESS.
 863  ****************************************************************************/
 864 static int Ogg_FindLogicalStreams( demux_t *p_demux )
 865 {
 866     demux_sys_t *p_ogg = p_demux->p_sys  ;
 867     ogg_packet oggpacket;
 868     ogg_page oggpage;
 869     int i_stream;
 870
 871     while( Ogg_ReadPage( p_demux, &oggpage ) == VLC_SUCCESS )
 872     {
 873         if( ogg_page_bos( &oggpage ) )
 874         {
 875
 876             /* All is wonderful in our fine fine little world.
 877              * We found the beginning of our first logical stream. */
 878             while( ogg_page_bos( &oggpage ) )
 879             {
 880                 logical_stream_t **pp_sav = p_ogg->pp_stream;
 881                 logical_stream_t *p_stream;
 882
 883                 p_stream = malloc( sizeof(logical_stream_t) );
 884                 if( !p_stream )
 885                     return VLC_ENOMEM;
 886
 887                 TAB_APPEND( p_ogg->i_streams, p_ogg->pp_stream, p_stream );
 888
 889                 memset( p_stream, 0, sizeof(logical_stream_t) );
 890                 p_stream->p_headers = 0;
 891                 p_stream->secondary_header_packets = 0;
 892
 893                 es_format_Init( &p_stream->fmt, 0, 0 );
 894                 es_format_Init( &p_stream->fmt_old, 0, 0 );
 895
 896                 /* Setup the logical stream */
 897                 p_stream->i_serial_no = ogg_page_serialno( &oggpage );
 898                 ogg_stream_init( &p_stream->os, p_stream->i_serial_no );
 899
 900                 /* Extract the initial header from the first page and verify
 901                  * the codec type of this Ogg bitstream */
 902                 if( ogg_stream_pagein( &p_stream->os, &oggpage ) < 0 )
 903                 {
 904                     /* error. stream version mismatch perhaps */
 905                     msg_Err( p_demux, "error reading first page of "
 906                              "Ogg bitstream data" );
 907                     return VLC_EGENERIC;
 908                 }
 909
 910                 /* FIXME: check return value */
 911                 ogg_stream_packetpeek( &p_stream->os, &oggpacket );
 912
 913                 /* Check for Vorbis header */
 914                 if( oggpacket.bytes >= 7 &&
 915                     ! memcmp( oggpacket.packet, "\x01vorbis", 7 ) )
 916                 {
 917                     Ogg_ReadVorbisHeader( p_stream, &oggpacket );
 918                     msg_Dbg( p_demux, "found vorbis header" );
 919                 }
 920                 /* Check for Speex header */
 921                 else if( oggpacket.bytes >= 5 &&
 922                     ! memcmp( oggpacket.packet, "Speex", 5 ) )
 923                 {
 924                     Ogg_ReadSpeexHeader( p_stream, &oggpacket );
 925                     msg_Dbg( p_demux, "found speex header, channels: %i, "
 926                              "rate: %i,  bitrate: %i",
 927                              p_stream->fmt.audio.i_channels,
 928                              (int)p_stream->f_rate, p_stream->fmt.i_bitrate );
 929                 }
 930                 /* Check for Flac header (< version 1.1.1) */
 931                 else if( oggpacket.bytes >= 4 &&
 932                     ! memcmp( oggpacket.packet, "fLaC", 4 ) )
 933                 {
 934                     msg_Dbg( p_demux, "found FLAC header" );
 935
 936                     /* Grrrr!!!! Did they really have to put all the
 937                      * important info in the second header packet!!!
 938                      * (STREAMINFO metadata is in the following packet) */
 939                     p_stream->b_force_backup = 1;
 940
 941                     p_stream->fmt.i_cat = AUDIO_ES;
 942                     p_stream->fmt.i_codec = VLC_FOURCC( 'f','l','a','c' );
 943                 }
 944                 /* Check for Flac header (>= version 1.1.1) */
 945                 else if( oggpacket.bytes >= 13 && oggpacket.packet[0] ==0x7F &&
 946                     ! memcmp( &oggpacket.packet[1], "FLAC", 4 ) &&
 947                     ! memcmp( &oggpacket.packet[9], "fLaC", 4 ) )
 948                 {
 949                     int i_packets = ((int)oggpacket.packet[7]) << 8 |
 950                         oggpacket.packet[8];
 951                     msg_Dbg( p_demux, "found FLAC header version %i.%i "
 952                              "(%i header packets)",
 953                              oggpacket.packet[5], oggpacket.packet[6],
 954                              i_packets );
 955
 956                     p_stream->b_force_backup = 1;
 957
 958                     p_stream->fmt.i_cat = AUDIO_ES;
 959                     p_stream->fmt.i_codec = VLC_FOURCC( 'f','l','a','c' );
 960                     oggpacket.packet += 13; oggpacket.bytes -= 13;
 961                     Ogg_ReadFlacHeader( p_demux, p_stream, &oggpacket );
 962                 }
 963                 /* Check for Theora header */
 964                 else if( oggpacket.bytes >= 7 &&
 965                          ! memcmp( oggpacket.packet, "\x80theora", 7 ) )
 966                 {
 967                     Ogg_ReadTheoraHeader( p_stream, &oggpacket );
 968
 969                     msg_Dbg( p_demux,
 970                              "found theora header, bitrate: %i, rate: %f",
 971                              p_stream->fmt.i_bitrate, p_stream->f_rate );
 972                 }
 973                 /* Check for Dirac header */
 974                 else if( oggpacket.bytes >= 5 &&
 975                          ! memcmp( oggpacket.packet, "BBCD\x00", 5 ) )
 976                 {
 977                     Ogg_ReadDiracHeader( p_stream, &oggpacket );
 978                     msg_Dbg( p_demux, "found dirac header" );
 979                 }
 980                 /* Check for Tarkin header */
 981                 else if( oggpacket.bytes >= 7 &&
 982                          ! memcmp( &oggpacket.packet[1], "tarkin", 6 ) )
 983                 {
 984                     oggpack_buffer opb;
 985
 986                     msg_Dbg( p_demux, "found tarkin header" );
 987                     p_stream->fmt.i_cat = VIDEO_ES;
 988                     p_stream->fmt.i_codec = VLC_FOURCC( 't','a','r','k' );
 989
 990                     /* Cheat and get additionnal info ;) */
 991                     oggpack_readinit( &opb, oggpacket.packet, oggpacket.bytes);
 992                     oggpack_adv( &opb, 88 );
 993                     oggpack_adv( &opb, 104 );
 994                     p_stream->fmt.i_bitrate = oggpack_read( &opb, 32 );
 995                     p_stream->f_rate = 2; /* FIXME */
 996                     msg_Dbg( p_demux,
 997                              "found tarkin header, bitrate: %i, rate: %f",
 998                              p_stream->fmt.i_bitrate, p_stream->f_rate );
 999                 }
1000                 /* Check for Annodex header */
1001                 else if( oggpacket.bytes >= 7 &&
1002                          ! memcmp( oggpacket.packet, "Annodex", 7 ) )
1003                 {
1004                     Ogg_ReadAnnodexHeader( VLC_OBJECT(p_demux), p_stream,
1005                                            &oggpacket );
1006                     /* kill annodex track */
1007                     free( p_stream );
1008                     p_ogg->i_streams--;
1009                 }
1010                 /* Check for Annodex header */
1011                 else if( oggpacket.bytes >= 7 &&
1012                          ! memcmp( oggpacket.packet, "AnxData", 7 ) )
1013                 {
1014                     Ogg_ReadAnnodexHeader( VLC_OBJECT(p_demux), p_stream,
1015                                            &oggpacket );
1016                 }
1017                 /* Check for Kate header */
1018                 else if( oggpacket.bytes >= 8 &&
1019                     ! memcmp( &oggpacket.packet[1], "kate\0\0\0", 7 ) )
1020                 {
1021                     Ogg_ReadKateHeader( p_stream, &oggpacket );
1022                     msg_Dbg( p_demux, "found kate header" );
1023                 }
1024                 else if( oggpacket.bytes >= 142 &&
1025                          !memcmp( &oggpacket.packet[1],
1026                                    "Direct Show Samples embedded in Ogg", 35 ))
1027                 {
1028                     /* Old header type */
1029
1030                     /* Check for video header (old format) */
1031                     if( GetDWLE((oggpacket.packet+96)) == 0x05589f80 &&
1032                         oggpacket.bytes >= 184 )
1033                     {
1034                         p_stream->fmt.i_cat = VIDEO_ES;
1035                         p_stream->fmt.i_codec =
1036                             VLC_FOURCC( oggpacket.packet[68],
1037                                         oggpacket.packet[69],
1038                                         oggpacket.packet[70],
1039                                         oggpacket.packet[71] );
1040                         msg_Dbg( p_demux, "found video header of type: %.4s",
1041                                  (char *)&p_stream->fmt.i_codec );
1042
1043                         p_stream->fmt.video.i_frame_rate = 10000000;
1044                         p_stream->fmt.video.i_frame_rate_base =
1045                             GetQWLE((oggpacket.packet+164));
1046                         p_stream->f_rate = 10000000.0 /
1047                             GetQWLE((oggpacket.packet+164));
1048                         p_stream->fmt.video.i_bits_per_pixel =
1049                             GetWLE((oggpacket.packet+182));
1050                         if( !p_stream->fmt.video.i_bits_per_pixel )
1051                             /* hack, FIXME */
1052                             p_stream->fmt.video.i_bits_per_pixel = 24;
1053                         p_stream->fmt.video.i_width =
1054                             GetDWLE((oggpacket.packet+176));
1055                         p_stream->fmt.video.i_height =
1056                             GetDWLE((oggpacket.packet+180));
1057
1058                         msg_Dbg( p_demux,
1059                                  "fps: %f, width:%i; height:%i, bitcount:%i",
1060                                  p_stream->f_rate,
1061                                  p_stream->fmt.video.i_width,
1062                                  p_stream->fmt.video.i_height,
1063                                  p_stream->fmt.video.i_bits_per_pixel);
1064
1065                     }
1066                     /* Check for audio header (old format) */
1067                     else if( GetDWLE((oggpacket.packet+96)) == 0x05589F81 )
1068                     {
1069                         unsigned int i_extra_size;
1070                         unsigned int i_format_tag;
1071
1072                         p_stream->fmt.i_cat = AUDIO_ES;
1073
1074                         i_extra_size = GetWLE((oggpacket.packet+140));
1075                         if( i_extra_size > 0 && i_extra_size < oggpacket.bytes - 142 )
1076                         {
1077                             p_stream->fmt.i_extra = i_extra_size;
1078                             p_stream->fmt.p_extra = malloc( i_extra_size );
1079                             if( p_stream->fmt.p_extra )
1080                                 memcpy( p_stream->fmt.p_extra,
1081                                         oggpacket.packet + 142, i_extra_size );
1082                             else
1083                                 p_stream->fmt.i_extra = 0;
1084                         }
1085
1086                         i_format_tag = GetWLE((oggpacket.packet+124));
1087                         p_stream->fmt.audio.i_channels =
1088                             GetWLE((oggpacket.packet+126));
1089                         p_stream->f_rate = p_stream->fmt.audio.i_rate =
1090                             GetDWLE((oggpacket.packet+128));
1091                         p_stream->fmt.i_bitrate =
1092                             GetDWLE((oggpacket.packet+132)) * 8;
1093                         p_stream->fmt.audio.i_blockalign =
1094                             GetWLE((oggpacket.packet+136));
1095                         p_stream->fmt.audio.i_bitspersample =
1096                             GetWLE((oggpacket.packet+138));
1097
1098                         wf_tag_to_fourcc( i_format_tag,
1099                                           &p_stream->fmt.i_codec, 0 );
1100
1101                         if( p_stream->fmt.i_codec ==
1102                             VLC_FOURCC('u','n','d','f') )
1103                         {
1104                             p_stream->fmt.i_codec = VLC_FOURCC( 'm', 's',
1105                                 ( i_format_tag >> 8 ) & 0xff,
1106                                 i_format_tag & 0xff );
1107                         }
1108
1109                         msg_Dbg( p_demux, "found audio header of type: %.4s",
1110                                  (char *)&p_stream->fmt.i_codec );
1111                         msg_Dbg( p_demux, "audio:0x%4.4x channels:%d %dHz "
1112                                  "%dbits/sample %dkb/s",
1113                                  i_format_tag,
1114                                  p_stream->fmt.audio.i_channels,
1115                                  p_stream->fmt.audio.i_rate,
1116                                  p_stream->fmt.audio.i_bitspersample,
1117                                  p_stream->fmt.i_bitrate / 1024 );
1118
1119                     }
1120                     else
1121                     {
1122                         msg_Dbg( p_demux, "stream %d has an old header "
1123                             "but is of an unknown type", p_ogg->i_streams-1 );
1124                         free( p_stream );
1125                         p_ogg->i_streams--;
1126                     }
1127                 }
1128                 else if( (*oggpacket.packet & PACKET_TYPE_BITS ) == PACKET_TYPE_HEADER &&
1129                          oggpacket.bytes >= 56+1 )
1130                 {
1131                     stream_header_t tmp;
1132                     stream_header_t *st = &tmp;
1133
1134                     memcpy( st->streamtype, &oggpacket.packet[1+0], 8 );
1135                     memcpy( st->subtype, &oggpacket.packet[1+8], 4 );
1136                     st->size = GetDWLE( &oggpacket.packet[1+12] );
1137                     st->time_unit = GetQWLE( &oggpacket.packet[1+16] );
1138                     st->samples_per_unit = GetQWLE( &oggpacket.packet[1+24] );
1139                     st->default_len = GetDWLE( &oggpacket.packet[1+32] );
1140                     st->buffersize = GetDWLE( &oggpacket.packet[1+36] );
1141                     st->bits_per_sample = GetWLE( &oggpacket.packet[1+40] ); // (padding 2)
1142
1143                     /* Check for video header (new format) */
1144                     if( !strncmp( st->streamtype, "video", 5 ) )
1145                     {
1146                         st->sh.video.width = GetDWLE( &oggpacket.packet[1+44] );
1147                         st->sh.video.height = GetDWLE( &oggpacket.packet[1+48] );
1148
1149                         p_stream->fmt.i_cat = VIDEO_ES;
1150
1151                         /* We need to get rid of the header packet */
1152                         ogg_stream_packetout( &p_stream->os, &oggpacket );
1153
1154                         p_stream->fmt.i_codec =
1155                             VLC_FOURCC( st->subtype[0], st->subtype[1],
1156                                         st->subtype[2], st->subtype[3] );
1157                         msg_Dbg( p_demux, "found video header of type: %.4s",
1158                                  (char *)&p_stream->fmt.i_codec );
1159
1160                         p_stream->fmt.video.i_frame_rate = 10000000;
1161                         p_stream->fmt.video.i_frame_rate_base = st->time_unit;
1162                         if( st->time_unit <= 0 )
1163                             st->time_unit = 400000;
1164                         p_stream->f_rate = 10000000.0 / st->time_unit;
1165                         p_stream->fmt.video.i_bits_per_pixel = st->bits_per_sample;
1166                         p_stream->fmt.video.i_width = st->sh.video.width;
1167                         p_stream->fmt.video.i_height = st->sh.video.height;
1168
1169                         msg_Dbg( p_demux,
1170                                  "fps: %f, width:%i; height:%i, bitcount:%i",
1171                                  p_stream->f_rate,
1172                                  p_stream->fmt.video.i_width,
1173                                  p_stream->fmt.video.i_height,
1174                                  p_stream->fmt.video.i_bits_per_pixel );
1175                     }
1176                     /* Check for audio header (new format) */
1177                     else if( !strncmp( st->streamtype, "audio", 5 ) )
1178                     {
1179                         char p_buffer[5];
1180                         unsigned int i_extra_size;
1181                         int i_format_tag;
1182
1183                         st->sh.audio.channels = GetWLE( &oggpacket.packet[1+44] );
1184                         st->sh.audio.blockalign = GetWLE( &oggpacket.packet[1+48] );
1185                         st->sh.audio.avgbytespersec = GetDWLE( &oggpacket.packet[1+52] );
1186
1187                         p_stream->fmt.i_cat = AUDIO_ES;
1188
1189                         /* We need to get rid of the header packet */
1190                         ogg_stream_packetout( &p_stream->os, &oggpacket );
1191
1192                         i_extra_size = st->size - 56;
1193
1194                         if( i_extra_size > 0 &&
1195                             i_extra_size < oggpacket.bytes - 1 - 56 )
1196                         {
1197                             p_stream->fmt.i_extra = i_extra_size;
1198                             p_stream->fmt.p_extra = malloc( p_stream->fmt.i_extra );
1199                             if( p_stream->fmt.p_extra )
1200                                 memcpy( p_stream->fmt.p_extra, st + 1,
1201                                         p_stream->fmt.i_extra );
1202                             else
1203                                 p_stream->fmt.i_extra = 0;
1204                         }
1205
1206                         memcpy( p_buffer, st->subtype, 4 );
1207                         p_buffer[4] = '\0';
1208                         i_format_tag = strtol(p_buffer,NULL,16);
1209                         p_stream->fmt.audio.i_channels = st->sh.audio.channels;
1210                         if( st->time_unit <= 0 )
1211                             st->time_unit = 10000000;
1212                         p_stream->f_rate = p_stream->fmt.audio.i_rate = st->samples_per_unit * 10000000 / st->time_unit;
1213                         p_stream->fmt.i_bitrate = st->sh.audio.avgbytespersec * 8;
1214                         p_stream->fmt.audio.i_blockalign = st->sh.audio.blockalign;
1215                         p_stream->fmt.audio.i_bitspersample = st->bits_per_sample;
1216
1217                         wf_tag_to_fourcc( i_format_tag,
1218                                           &p_stream->fmt.i_codec, 0 );
1219
1220                         if( p_stream->fmt.i_codec ==
1221                             VLC_FOURCC('u','n','d','f') )
1222                         {
1223                             p_stream->fmt.i_codec = VLC_FOURCC( 'm', 's',
1224                                 ( i_format_tag >> 8 ) & 0xff,
1225                                 i_format_tag & 0xff );
1226                         }
1227
1228                         msg_Dbg( p_demux, "found audio header of type: %.4s",
1229                                  (char *)&p_stream->fmt.i_codec );
1230                         msg_Dbg( p_demux, "audio:0x%4.4x channels:%d %dHz "
1231                                  "%dbits/sample %dkb/s",
1232                                  i_format_tag,
1233                                  p_stream->fmt.audio.i_channels,
1234                                  p_stream->fmt.audio.i_rate,
1235                                  p_stream->fmt.audio.i_bitspersample,
1236                                  p_stream->fmt.i_bitrate / 1024 );
1237                     }
1238                     /* Check for text (subtitles) header */
1239                     else if( !strncmp(st->streamtype, "text", 4) )
1240                     {
1241                         /* We need to get rid of the header packet */
1242                         ogg_stream_packetout( &p_stream->os, &oggpacket );
1243
1244                         msg_Dbg( p_demux, "found text subtitles header" );
1245                         p_stream->fmt.i_cat = SPU_ES;
1246                         p_stream->fmt.i_codec = VLC_FOURCC('s','u','b','t');
1247                         p_stream->f_rate = 1000; /* granulepos is in millisec */
1248                     }
1249                     else
1250                     {
1251                         msg_Dbg( p_demux, "stream %d has a header marker "
1252                             "but is of an unknown type", p_ogg->i_streams-1 );
1253                         free( p_stream );
1254                         p_ogg->i_streams--;
1255                     }
1256                 }
1257                 else if( oggpacket.bytes >= 7 &&
1258                              ! memcmp( oggpacket.packet, "fishead", 7 ) )
1259
1260                 {
1261                     /* Skeleton */
1262                     msg_Dbg( p_demux, "stream %d is a skeleton",
1263                                 p_ogg->i_streams-1 );
1264                     /* FIXME: https://trac.videolan.org/vlc/ticket/1412 */
1265                 }
1266                 else
1267                 {
1268                     msg_Dbg( p_demux, "stream %d is of unknown type",
1269                              p_ogg->i_streams-1 );
1270                     free( p_stream );
1271                     p_ogg->i_streams--;
1272                 }
1273
1274                 if( Ogg_ReadPage( p_demux, &oggpage ) != VLC_SUCCESS )
1275                     return VLC_EGENERIC;
1276             }
1277
1278             /* we'll need to get all headers for all of those streams
1279                that we have to backup headers for */
1280             p_ogg->i_bos = 0;
1281             for( i_stream = 0; i_stream < p_ogg->i_streams; i_stream++ )
1282             {
1283                 if( p_ogg->pp_stream[i_stream]->b_force_backup )
1284                     p_ogg->i_bos++;
1285             }
1286
1287
1288             /* This is the first data page, which means we are now finished
1289              * with the initial pages. We just need to store it in the relevant
1290              * bitstream. */
1291             for( i_stream = 0; i_stream < p_ogg->i_streams; i_stream++ )
1292             {
1293                 if( ogg_stream_pagein( &p_ogg->pp_stream[i_stream]->os,
1294                                        &oggpage ) == 0 )
1295                 {
1296                     p_ogg->b_page_waiting = true;
1297                     break;
1298                 }
1299             }
1300
1301             return VLC_SUCCESS;
1302         }
1303     }
1304
1305     return VLC_EGENERIC;
1306 }
1307
1308 /****************************************************************************
1309  * Ogg_BeginningOfStream: Look for Beginning of Stream ogg pages and add
1310  *                        Elementary streams.
1311  ****************************************************************************/
1312 static int Ogg_BeginningOfStream( demux_t *p_demux )
1313 {
1314     demux_sys_t *p_ogg = p_demux->p_sys  ;
1315     logical_stream_t *p_old_stream = p_ogg->p_old_stream;
1316     int i_stream;
1317
1318     /* Find the logical streams embedded in the physical stream and
1319      * initialize our p_ogg structure. */
1320     if( Ogg_FindLogicalStreams( p_demux ) != VLC_SUCCESS )
1321     {
1322         msg_Warn( p_demux, "couldn't find any ogg logical stream" );
1323         return VLC_EGENERIC;
1324     }
1325
1326     p_ogg->i_bitrate = 0;
1327
1328     for( i_stream = 0 ; i_stream < p_ogg->i_streams; i_stream++ )
1329     {
1330         logical_stream_t *p_stream = p_ogg->pp_stream[i_stream];
1331
1332         p_stream->p_es = NULL;
1333
1334         /* Try first to reuse an old ES */
1335         if( p_old_stream &&
1336             p_old_stream->fmt.i_cat == p_stream->fmt.i_cat &&
1337             p_old_stream->fmt.i_codec == p_stream->fmt.i_codec )
1338         {
1339             msg_Dbg( p_demux, "will reuse old stream to avoid glitch" );
1340
1341             p_stream->p_es = p_old_stream->p_es;
1342             es_format_Copy( &p_stream->fmt_old, &p_old_stream->fmt );
1343
1344             p_old_stream->p_es = NULL;
1345             p_old_stream = NULL;
1346         }
1347
1348         if( !p_stream->p_es )
1349             p_stream->p_es = es_out_Add( p_demux->out, &p_stream->fmt );
1350
1351         // TODO: something to do here ?
1352         if( p_stream->fmt.i_codec == VLC_FOURCC('c','m','m','l') )
1353         {
1354             /* Set the CMML stream active */
1355             es_out_Control( p_demux->out, ES_OUT_SET_ES, p_stream->p_es );
1356         }
1357
1358         p_ogg->i_bitrate += p_stream->fmt.i_bitrate;
1359
1360         p_stream->i_pcr = p_stream->i_previous_pcr =
1361             p_stream->i_interpolated_pcr = -1;
1362         p_stream->b_reinit = 0;
1363     }
1364
1365     if( p_ogg->p_old_stream )
1366     {
1367         if( p_ogg->p_old_stream->p_es )
1368             msg_Dbg( p_demux, "old stream not reused" );
1369         Ogg_LogicalStreamDelete( p_demux, p_ogg->p_old_stream );
1370         p_ogg->p_old_stream = NULL;
1371     }
1372     return VLC_SUCCESS;
1373 }
1374
1375 /****************************************************************************
1376  * Ogg_EndOfStream: clean up the ES when an End of Stream is detected.
1377  ****************************************************************************/
1378 static void Ogg_EndOfStream( demux_t *p_demux )
1379 {
1380     demux_sys_t *p_ogg = p_demux->p_sys  ;
1381     int i_stream;
1382
1383     for( i_stream = 0 ; i_stream < p_ogg->i_streams; i_stream++ )
1384         Ogg_LogicalStreamDelete( p_demux, p_ogg->pp_stream[i_stream] );
1385     free( p_ogg->pp_stream );
1386
1387     /* Reinit p_ogg */
1388     p_ogg->i_bitrate = 0;
1389     p_ogg->i_streams = 0;
1390     p_ogg->pp_stream = NULL;
1391 }
1392
1393 /**
1394  * This function delete and release all data associated to a logical_stream_t
1395  */
1396 static void Ogg_LogicalStreamDelete( demux_t *p_demux, logical_stream_t *p_stream )
1397 {
1398     if( p_stream->p_es )
1399         es_out_Del( p_demux->out, p_stream->p_es );
1400
1401     ogg_stream_clear( &p_stream->os );
1402     free( p_stream->p_headers );
1403
1404     es_format_Clean( &p_stream->fmt_old );
1405     es_format_Clean( &p_stream->fmt );
1406
1407     free( p_stream );
1408 }
1409 /**
1410  * This function check if a we need to reset a decoder in case we are
1411  * reusing an old ES
1412  */
1413 static bool Ogg_IsVorbisFormatCompatible( const es_format_t *p_new, const es_format_t *p_old )
1414 {
1415     int i_new = 0;
1416     int i_old = 0;
1417     int i;
1418
1419     for( i = 0; i < 3; i++ )
1420     {
1421         const uint8_t *p_new_extra = ( const uint8_t*)p_new->p_extra + i_new;
1422         const uint8_t *p_old_extra = ( const uint8_t*)p_old->p_extra + i_old;
1423
1424         if( p_new->i_extra < i_new+2 || p_old->i_extra < i_old+2 )
1425             return false;
1426
1427         const int i_new_size = GetWBE( &p_new_extra[0] );
1428         const int i_old_size = GetWBE( &p_old_extra[0] );
1429
1430         if( i != 1 ) /* Ignore vorbis comment */
1431         {
1432             if( i_new_size != i_old_size )
1433                 return false;
1434             if( memcmp( &p_new_extra[2], &p_old_extra[2], i_new_size ) )
1435                 return false;
1436         }
1437
1438         i_new += 2 + i_new_size;
1439         i_old += 2 + i_old_size;
1440     }
1441     return true;
1442 }
1443 static bool Ogg_LogicalStreamResetEsFormat( demux_t *p_demux, logical_stream_t *p_stream )
1444 {
1445     bool b_compatible = false;
1446     if( !p_stream->fmt_old.i_cat || !p_stream->fmt_old.i_codec )
1447         return true;
1448
1449     /* Only vorbis is supported */
1450     if( p_stream->fmt.i_codec == VLC_FOURCC( 'v','o','r','b' ) )
1451         b_compatible = Ogg_IsVorbisFormatCompatible( &p_stream->fmt, &p_stream->fmt_old );
1452
1453     if( !b_compatible )
1454         msg_Warn( p_demux, "cannot reuse old stream, resetting the decoder" );
1455
1456     return !b_compatible;
1457 }
1458
1459 static void Ogg_ReadTheoraHeader( logical_stream_t *p_stream,
1460                                   ogg_packet *p_oggpacket )
1461 {
1462     bs_t bitstream;
1463     int i_fps_numerator;
1464     int i_fps_denominator;
1465     int i_keyframe_frequency_force;
1466
1467     p_stream->fmt.i_cat = VIDEO_ES;
1468     p_stream->fmt.i_codec = VLC_FOURCC( 't','h','e','o' );
1469
1470     /* Signal that we want to keep a backup of the theora
1471      * stream headers. They will be used when switching between
1472      * audio streams. */
1473     p_stream->b_force_backup = 1;
1474
1475     /* Cheat and get additionnal info ;) */
1476     bs_init( &bitstream, p_oggpacket->packet, p_oggpacket->bytes );
1477     bs_skip( &bitstream, 56 );
1478     bs_read( &bitstream, 8 ); /* major version num */
1479     bs_read( &bitstream, 8 ); /* minor version num */
1480     bs_read( &bitstream, 8 ); /* subminor version num */
1481     bs_read( &bitstream, 16 ) /*<< 4*/; /* width */
1482     bs_read( &bitstream, 16 ) /*<< 4*/; /* height */
1483     bs_read( &bitstream, 24 ); /* frame width */
1484     bs_read( &bitstream, 24 ); /* frame height */
1485     bs_read( &bitstream, 8 ); /* x offset */
1486     bs_read( &bitstream, 8 ); /* y offset */
1487
1488     i_fps_numerator = bs_read( &bitstream, 32 );
1489     i_fps_denominator = bs_read( &bitstream, 32 );
1490     bs_read( &bitstream, 24 ); /* aspect_numerator */
1491     bs_read( &bitstream, 24 ); /* aspect_denominator */
1492
1493     p_stream->fmt.video.i_frame_rate = i_fps_numerator;
1494     p_stream->fmt.video.i_frame_rate_base = i_fps_denominator;
1495
1496     bs_read( &bitstream, 8 ); /* colorspace */
1497     p_stream->fmt.i_bitrate = bs_read( &bitstream, 24 );
1498     bs_read( &bitstream, 6 ); /* quality */
1499
1500     i_keyframe_frequency_force = 1 << bs_read( &bitstream, 5 );
1501
1502     /* granule_shift = i_log( frequency_force -1 ) */
1503     p_stream->i_granule_shift = 0;
1504     i_keyframe_frequency_force--;
1505     while( i_keyframe_frequency_force )
1506     {
1507         p_stream->i_granule_shift++;
1508         i_keyframe_frequency_force >>= 1;
1509     }
1510
1511     p_stream->f_rate = ((float)i_fps_numerator) / i_fps_denominator;
1512 }
1513
1514 static void Ogg_ReadVorbisHeader( logical_stream_t *p_stream,
1515                                   ogg_packet *p_oggpacket )
1516 {
1517     oggpack_buffer opb;
1518
1519     p_stream->fmt.i_cat = AUDIO_ES;
1520     p_stream->fmt.i_codec = VLC_FOURCC( 'v','o','r','b' );
1521
1522     /* Signal that we want to keep a backup of the vorbis
1523      * stream headers. They will be used when switching between
1524      * audio streams. */
1525     p_stream->b_force_backup = 1;
1526
1527     /* Cheat and get additionnal info ;) */
1528     oggpack_readinit( &opb, p_oggpacket->packet, p_oggpacket->bytes);
1529     oggpack_adv( &opb, 88 );
1530     p_stream->fmt.audio.i_channels = oggpack_read( &opb, 8 );
1531     p_stream->f_rate = p_stream->fmt.audio.i_rate =
1532         oggpack_read( &opb, 32 );
1533     oggpack_adv( &opb, 32 );
1534     p_stream->fmt.i_bitrate = oggpack_read( &opb, 32 );
1535 }
1536
1537 static void Ogg_ReadSpeexHeader( logical_stream_t *p_stream,
1538                                  ogg_packet *p_oggpacket )
1539 {
1540     oggpack_buffer opb;
1541
1542     p_stream->fmt.i_cat = AUDIO_ES;
1543     p_stream->fmt.i_codec = VLC_FOURCC( 's','p','x',' ' );
1544
1545     /* Signal that we want to keep a backup of the speex
1546      * stream headers. They will be used when switching between
1547      * audio streams. */
1548     p_stream->b_force_backup = 1;
1549
1550     /* Cheat and get additionnal info ;) */
1551     oggpack_readinit( &opb, p_oggpacket->packet, p_oggpacket->bytes);
1552     oggpack_adv( &opb, 224 );
1553     oggpack_adv( &opb, 32 ); /* speex_version_id */
1554     oggpack_adv( &opb, 32 ); /* header_size */
1555     p_stream->f_rate = p_stream->fmt.audio.i_rate = oggpack_read( &opb, 32 );
1556     oggpack_adv( &opb, 32 ); /* mode */
1557     oggpack_adv( &opb, 32 ); /* mode_bitstream_version */
1558     p_stream->fmt.audio.i_channels = oggpack_read( &opb, 32 );
1559     p_stream->fmt.i_bitrate = oggpack_read( &opb, 32 );
1560 }
1561
1562 static void Ogg_ReadFlacHeader( demux_t *p_demux, logical_stream_t *p_stream,
1563                                 ogg_packet *p_oggpacket )
1564 {
1565     /* Parse the STREAMINFO metadata */
1566     bs_t s;
1567
1568     bs_init( &s, p_oggpacket->packet, p_oggpacket->bytes );
1569
1570     bs_read( &s, 1 );
1571     if( bs_read( &s, 7 ) == 0 )
1572     {
1573         if( bs_read( &s, 24 ) >= 34 /*size STREAMINFO*/ )
1574         {
1575             bs_skip( &s, 80 );
1576             p_stream->f_rate = p_stream->fmt.audio.i_rate = bs_read( &s, 20 );
1577             p_stream->fmt.audio.i_channels = bs_read( &s, 3 ) + 1;
1578
1579             msg_Dbg( p_demux, "FLAC header, channels: %i, rate: %i",
1580                      p_stream->fmt.audio.i_channels, (int)p_stream->f_rate );
1581         }
1582         else msg_Dbg( p_demux, "FLAC STREAMINFO metadata too short" );
1583
1584         /* Fake this as the last metadata block */
1585         *((uint8_t*)p_oggpacket->packet) |= 0x80;
1586     }
1587     else
1588     {
1589         /* This ain't a STREAMINFO metadata */
1590         msg_Dbg( p_demux, "Invalid FLAC STREAMINFO metadata" );
1591     }
1592 }
1593
1594 static void Ogg_ReadKateHeader( logical_stream_t *p_stream,
1595                                 ogg_packet *p_oggpacket )
1596 {
1597     oggpack_buffer opb;
1598     int32_t gnum;
1599     int32_t gden;
1600     int n;
1601
1602     p_stream->fmt.i_cat = SPU_ES;
1603     p_stream->fmt.i_codec = VLC_FOURCC( 'k','a','t','e' );
1604
1605     /* Signal that we want to keep a backup of the kate
1606      * stream headers. They will be used when switching between
1607      * kate streams. */
1608     p_stream->b_force_backup = 1;
1609
1610     /* Cheat and get additionnal info ;) */
1611     oggpack_readinit( &opb, p_oggpacket->packet, p_oggpacket->bytes);
1612     oggpack_adv( &opb, 11*8 ); /* packet type, kate magic, version */
1613     p_stream->i_kate_num_headers = oggpack_read( &opb, 8 );
1614     oggpack_adv( &opb, 3*8 );
1615     p_stream->i_granule_shift = oggpack_read( &opb, 8 );
1616     oggpack_adv( &opb, 8*8 ); /* reserved */
1617     gnum = oggpack_read( &opb, 32 );
1618     gden = oggpack_read( &opb, 32 );
1619     p_stream->f_rate = (double)gnum/gden;
1620
1621     p_stream->fmt.psz_language = malloc(16);
1622     if (p_stream->fmt.psz_language)
1623     {
1624         for (n=0;n<16;++n)
1625             p_stream->fmt.psz_language[n] = oggpack_read(&opb,8);
1626         p_stream->fmt.psz_language[15] = 0; /* just in case */
1627     }
1628     else
1629     {
1630         for (n=0;n<16;++n)
1631             oggpack_read(&opb,8);
1632     }
1633     p_stream->fmt.psz_description = malloc(16);
1634     if (p_stream->fmt.psz_description)
1635     {
1636         for (n=0;n<16;++n)
1637             p_stream->fmt.psz_description[n] = oggpack_read(&opb,8);
1638         p_stream->fmt.psz_description[15] = 0; /* just in case */
1639     }
1640     else
1641     {
1642         for (n=0;n<16;++n)
1643             oggpack_read(&opb,8);
1644     }
1645 }
1646
1647 static void Ogg_ReadAnnodexHeader( vlc_object_t *p_this,
1648                                    logical_stream_t *p_stream,
1649                                    ogg_packet *p_oggpacket )
1650 {
1651     if( p_oggpacket->bytes >= 28 &&
1652         !memcmp( p_oggpacket->packet, "Annodex", 7 ) )
1653     {
1654         oggpack_buffer opb;
1655
1656         uint16_t major_version;
1657         uint16_t minor_version;
1658         uint64_t timebase_numerator;
1659         uint64_t timebase_denominator;
1660
1661         Ogg_ReadTheoraHeader( p_stream, p_oggpacket );
1662
1663         oggpack_readinit( &opb, p_oggpacket->packet, p_oggpacket->bytes);
1664         oggpack_adv( &opb, 8*8 ); /* "Annodex\0" header */
1665         major_version = oggpack_read( &opb, 2*8 ); /* major version */
1666         minor_version = oggpack_read( &opb, 2*8 ); /* minor version */
1667         timebase_numerator = GetQWLE( &p_oggpacket->packet[16] );
1668         timebase_denominator = GetQWLE( &p_oggpacket->packet[24] );
1669     }
1670     else if( p_oggpacket->bytes >= 42 &&
1671              !memcmp( p_oggpacket->packet, "AnxData", 7 ) )
1672     {
1673         uint64_t granule_rate_numerator;
1674         uint64_t granule_rate_denominator;
1675         char content_type_string[1024];
1676
1677         /* Read in Annodex header fields */
1678
1679         granule_rate_numerator = GetQWLE( &p_oggpacket->packet[8] );
1680         granule_rate_denominator = GetQWLE( &p_oggpacket->packet[16] );
1681         p_stream->secondary_header_packets =
1682             GetDWLE( &p_oggpacket->packet[24] );
1683
1684         /* we are guaranteed that the first header field will be
1685          * the content-type (by the Annodex standard) */
1686         content_type_string[0] = '\0';
1687         if( !strncasecmp( (char*)(&p_oggpacket->packet[28]), "Content-Type: ", 14 ) )
1688         {
1689             uint8_t *p = memchr( &p_oggpacket->packet[42], '\r',
1690                                  p_oggpacket->bytes - 1 );
1691             if( p && p[0] == '\r' && p[1] == '\n' )
1692                 sscanf( (char*)(&p_oggpacket->packet[42]), "%1024s\r\n",
1693                         content_type_string );
1694         }
1695
1696         msg_Dbg( p_this, "AnxData packet info: %"PRId64" / %"PRId64", %d, ``%s''",
1697                  granule_rate_numerator, granule_rate_denominator,
1698                  p_stream->secondary_header_packets, content_type_string );
1699
1700         p_stream->f_rate = (float) granule_rate_numerator /
1701             (float) granule_rate_denominator;
1702
1703         /* What type of file do we have?
1704          * strcmp is safe to use here because we've extracted
1705          * content_type_string from the stream manually */
1706         if( !strncmp(content_type_string, "audio/x-wav", 11) )
1707         {
1708             /* n.b. WAVs are unsupported right now */
1709             p_stream->fmt.i_cat = UNKNOWN_ES;
1710         }
1711         else if( !strncmp(content_type_string, "audio/x-vorbis", 14) )
1712         {
1713             p_stream->fmt.i_cat = AUDIO_ES;
1714             p_stream->fmt.i_codec = VLC_FOURCC( 'v','o','r','b' );
1715
1716             p_stream->b_force_backup = 1;
1717         }
1718         else if( !strncmp(content_type_string, "audio/x-speex", 14) )
1719         {
1720             p_stream->fmt.i_cat = AUDIO_ES;
1721             p_stream->fmt.i_codec = VLC_FOURCC( 's','p','x',' ' );
1722
1723             p_stream->b_force_backup = 1;
1724         }
1725         else if( !strncmp(content_type_string, "video/x-theora", 14) )
1726         {
1727             p_stream->fmt.i_cat = VIDEO_ES;
1728             p_stream->fmt.i_codec = VLC_FOURCC( 't','h','e','o' );
1729
1730             p_stream->b_force_backup = 1;
1731         }
1732         else if( !strncmp(content_type_string, "video/x-xvid", 14) )
1733         {
1734             p_stream->fmt.i_cat = VIDEO_ES;
1735             p_stream->fmt.i_codec = VLC_FOURCC( 'x','v','i','d' );
1736
1737             p_stream->b_force_backup = 1;
1738         }
1739         else if( !strncmp(content_type_string, "video/mpeg", 14) )
1740         {
1741             /* n.b. MPEG streams are unsupported right now */
1742             p_stream->fmt.i_cat = VIDEO_ES;
1743             p_stream->fmt.i_codec = VLC_FOURCC( 'm','p','g','v' );
1744         }
1745         else if( !strncmp(content_type_string, "text/x-cmml", 11) )
1746         {
1747             ogg_stream_packetout( &p_stream->os, p_oggpacket );
1748             p_stream->fmt.i_cat = SPU_ES;
1749             p_stream->fmt.i_codec = VLC_FOURCC( 'c','m','m','l' );
1750         }
1751     }
1752 }
1753
1754 static uint32_t dirac_uint( bs_t *p_bs )
1755 {
1756   uint32_t count = 0, value = 0;
1757   while( !bs_read ( p_bs, 1 ) ) {
1758     count++;
1759     value <<= 1;
1760     value |= bs_read ( p_bs, 1 );
1761   }
1762
1763   return (1<<count) - 1 + value;
1764 }
1765
1766 static int dirac_bool( bs_t *p_bs )
1767 {
1768     return bs_read ( p_bs, 1 );
1769 }
1770
1771 static void Ogg_ReadDiracHeader( logical_stream_t *p_stream,
1772                                  ogg_packet *p_oggpacket )
1773 {
1774     bs_t bs;
1775
1776     p_stream->fmt.i_cat = VIDEO_ES;
1777     p_stream->fmt.i_codec = VLC_FOURCC( 'd','r','a','c' );
1778     p_stream->i_granule_shift = 32;
1779
1780     /* Backing up stream headers is not required -- seqhdrs are repeated
1781      * thoughout the stream at suitable decoding start points */
1782     p_stream->b_force_backup = 0;
1783
1784     /* read in useful bits from sequence header */
1785     bs_init( &bs, p_oggpacket->packet, p_oggpacket->bytes );
1786     bs_skip( &bs, 13*8); /* parse_info_header */
1787     dirac_uint( &bs ); /* major_version */
1788     dirac_uint( &bs ); /* minor_version */
1789     dirac_uint( &bs ); /* profile */
1790     dirac_uint( &bs ); /* level */
1791
1792     uint32_t u_video_format = dirac_uint( &bs ); /* index */
1793
1794     if (dirac_bool( &bs )) {
1795         dirac_uint( &bs ); /* frame_width */
1796         dirac_uint( &bs ); /* frame_height */
1797     }
1798
1799     if (dirac_bool( &bs )) {
1800         dirac_uint( &bs ); /* chroma_format */
1801     }
1802
1803     if (dirac_bool( &bs )) {
1804         dirac_uint( &bs ); /* scan_format */
1805     }
1806
1807     static const struct {
1808         uint32_t u_n /* numerator */, u_d /* denominator */;
1809     } dirac_frate_tbl[] = { /* table 10.3 */
1810         {1,1}, /* this first value is never used */
1811         {24000,1001}, {24,1}, {25,1}, {30000,1001}, {30,1},
1812         {50,1}, {60000,1001}, {60,1}, {15000,1001}, {25,2},
1813     };
1814
1815     static const uint32_t dirac_vidfmt_frate[] = { /* table C.1 */
1816         1, 9, 10, 9, 10, 9, 10, 4, 3, 7, 6, 4, 3, 7, 6, 2, 2, 7, 6, 7, 6,
1817     };
1818
1819     uint32_t u_n = dirac_frate_tbl[dirac_vidfmt_frate[u_video_format]].u_n;
1820     uint32_t u_d = dirac_frate_tbl[dirac_vidfmt_frate[u_video_format]].u_d;
1821     if (dirac_bool( &bs )) {
1822         uint32_t frame_rate_index = dirac_uint( &bs );
1823         u_n = dirac_frate_tbl[frame_rate_index].u_n;
1824         u_d = dirac_frate_tbl[frame_rate_index].u_d;
1825         if (frame_rate_index == 0) {
1826             u_n = dirac_uint( &bs ); /* frame_rate_numerator */
1827             u_d = dirac_uint( &bs ); /* frame_rate_denominator */
1828         }
1829     }
1830     p_stream->f_rate = (float) u_n / u_d;
1831 }