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

   1 /*****************************************************************************
   2  * ogg.c : ogg stream input module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2001 VideoLAN
   5  * $Id: ogg.c,v 1.3 2002/11/02 18:13:22 gbazin Exp $
   6  *
   7  * Authors: Gildas Bazin <gbazin@netcourrier.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <stdlib.h>                                      /* malloc(), free() */
  28 #include <string.h>
  29
  30 #include <vlc/vlc.h>
  31 #include <vlc/input.h>
  32
  33 #include <sys/types.h>
  34
  35 #include <ogg/ogg.h>
  36
  37 #define OGG_BLOCK_SIZE 4096
  38 #define PAGES_READ_ONCE 1
  39
  40 /*****************************************************************************
  41  * Definitions of structures and functions used by this plugins
  42  *****************************************************************************/
  43 typedef struct logical_stream_s
  44 {
  45     ogg_stream_state os;                        /* logical stream of packets */
  46
  47     int              i_serial_no;
  48     int              i_pages_read;
  49     int              i_cat;                            /* AUDIO_ES, VIDEO_ES */
  50     int              i_activated;
  51     vlc_fourcc_t     i_fourcc;
  52     vlc_fourcc_t     i_codec;
  53
  54     es_descriptor_t  *p_es;
  55     int              b_selected;                           /* newly selected */
  56
  57     /* program clock reference (in units of 90kHz) derived from the previous
  58      * granulepos */
  59     mtime_t i_pcr;
  60
  61     /* info from logical streams */
  62     int i_rate;
  63     int i_bitrate;
  64     int b_reinit;
  65
  66 } logical_stream_t;
  67
  68 struct demux_sys_t
  69 {
  70     ogg_sync_state oy;        /* sync and verify incoming physical bitstream */
  71
  72     int i_streams;                           /* number of logical bitstreams */
  73     logical_stream_t **pp_stream;  /* pointer to an array of logical streams */
  74
  75     /* current audio and video es */
  76     logical_stream_t *p_stream_video;
  77     logical_stream_t *p_stream_audio;
  78
  79     /* stream we use as a time reference for demux reading speed */
  80     logical_stream_t *p_stream_timeref;
  81
  82     /* program clock reference (in units of 90kHz) derived from the pcr of
  83      * one of the sub-streams (p_stream_timeref) */
  84     mtime_t i_pcr;
  85
  86     mtime_t i_length;
  87     int     b_seekable;
  88 };
  89
  90 /*****************************************************************************
  91  * Local prototypes
  92  *****************************************************************************/
  93 static int  Activate  ( vlc_object_t * );
  94 static void Deactivate( vlc_object_t * );
  95 static int  Demux     ( input_thread_t * );
  96
  97 /* Stream managment */
  98 static int  Ogg_StreamStart  ( input_thread_t *, demux_sys_t *, int );
  99 static int  Ogg_StreamSeek   ( input_thread_t *, demux_sys_t *, int, mtime_t );
 100 static void Ogg_StreamStop   ( input_thread_t *, demux_sys_t *, int );
 101
 102 /* Bitstream manipulation */
 103 static int  Ogg_Check        ( input_thread_t *p_input );
 104 static int  Ogg_ReadPage     ( input_thread_t *, demux_sys_t *, ogg_page * );
 105 static void Ogg_DecodePacket ( input_thread_t *p_input,
 106                                logical_stream_t *p_stream,
 107                                ogg_packet *p_oggpacket );
 108 static int  Ogg_FindLogicalStreams( input_thread_t *p_input,
 109                                     demux_sys_t *p_ogg );
 110
 111 /*****************************************************************************
 112  * Module descriptor
 113  *****************************************************************************/
 114 vlc_module_begin();
 115     set_description( _("ogg stream demux" ) );
 116     set_capability( "demux", 50 );
 117     set_callbacks( Activate, Deactivate );
 118     add_shortcut( "ogg" );
 119 vlc_module_end();
 120
 121 /*****************************************************************************
 122  * Stream managment
 123  *****************************************************************************/
 124 static int Ogg_StreamStart( input_thread_t *p_input,
 125                             demux_sys_t *p_ogg, int i_stream )
 126 {
 127 #define p_stream p_ogg->pp_stream[i_stream]
 128     if( !p_stream->p_es )
 129     {
 130         msg_Warn( p_input, "stream[%d] unselectable", i_stream );
 131         return( 0 );
 132     }
 133     if( p_stream->i_activated )
 134     {
 135         msg_Warn( p_input, "stream[%d] already selected", i_stream );
 136         return( 1 );
 137     }
 138
 139     if( !p_stream->p_es->p_decoder_fifo )
 140     {
 141         vlc_mutex_lock( &p_input->stream.stream_lock );
 142         input_SelectES( p_input, p_stream->p_es );
 143         vlc_mutex_unlock( &p_input->stream.stream_lock );
 144     }
 145     p_stream->i_activated = p_stream->p_es->p_decoder_fifo ? 1 : 0;
 146
 147     //Ogg_StreamSeek( p_input, p_ogg, i_stream, p_ogg->i_time );
 148
 149     return( p_stream->i_activated );
 150 #undef  p_stream
 151 }
 152
 153 static void Ogg_StreamStop( input_thread_t *p_input,
 154                             demux_sys_t *p_ogg, int i_stream )
 155 {
 156 #define p_stream    p_ogg->pp_stream[i_stream]
 157
 158     if( !p_stream->i_activated )
 159     {
 160         msg_Warn( p_input, "stream[%d] already unselected", i_stream );
 161         return;
 162     }
 163
 164     if( p_stream->p_es->p_decoder_fifo )
 165     {
 166         vlc_mutex_lock( &p_input->stream.stream_lock );
 167         input_UnselectES( p_input, p_stream->p_es );
 168         vlc_mutex_unlock( &p_input->stream.stream_lock );
 169     }
 170
 171     p_stream->i_activated = 0;
 172
 173 #undef  p_stream
 174 }
 175
 176 static int Ogg_StreamSeek( input_thread_t *p_input, demux_sys_t  *p_ogg,
 177                            int i_stream, mtime_t i_date )
 178 {
 179 #define p_stream    p_ogg->pp_stream[i_stream]
 180
 181     /* FIXME: todo */
 182
 183     return 1;
 184 #undef p_stream
 185 }
 186
 187 /****************************************************************************
 188  * Ogg_Check: Check we are dealing with an ogg stream.
 189  ****************************************************************************/
 190 static int Ogg_Check( input_thread_t *p_input )
 191 {
 192     u8 *p_peek;
 193     int i_size = input_Peek( p_input, &p_peek, 4 );
 194
 195     /* Check for the Ogg capture pattern */
 196     if( !(i_size>3) || !(p_peek[0] == 'O') || !(p_peek[1] == 'g') ||
 197         !(p_peek[2] == 'g') || !(p_peek[3] == 'S') )
 198         return VLC_EGENERIC;
 199
 200     /* FIXME: Capture pattern might not be enough so we can also check for the
 201      * the first complete page */
 202
 203     return VLC_SUCCESS;
 204 }
 205
 206 /****************************************************************************
 207  * Ogg_ReadPage: Read a full Ogg page from the physical bitstream.
 208  ****************************************************************************
 209  * Returns VLC_SUCCESS if a page has been read. An error might happen if we
 210  * are at the end of stream.
 211  ****************************************************************************/
 212 static int Ogg_ReadPage( input_thread_t *p_input, demux_sys_t *p_ogg,
 213                          ogg_page *p_oggpage )
 214 {
 215     int i_read = 0;
 216     data_packet_t *p_data;
 217     byte_t *p_buffer;
 218
 219     while( ogg_sync_pageout( &p_ogg->oy, p_oggpage ) != 1 )
 220     {
 221         i_read = input_SplitBuffer( p_input, &p_data, OGG_BLOCK_SIZE );
 222         if( i_read <= 0 )
 223             return VLC_EGENERIC;
 224
 225         p_buffer = ogg_sync_buffer( &p_ogg->oy, i_read );
 226         p_input->p_vlc->pf_memcpy( p_buffer, p_data->p_payload_start, i_read );
 227         ogg_sync_wrote( &p_ogg->oy, i_read );
 228         input_DeletePacket( p_input->p_method_data, p_data );
 229     }
 230
 231     return VLC_SUCCESS;
 232 }
 233
 234 /****************************************************************************
 235  * Ogg_DecodePacket: Decode an Ogg packet.
 236  ****************************************************************************/
 237 static void Ogg_DecodePacket( input_thread_t *p_input,
 238                               logical_stream_t *p_stream,
 239                               ogg_packet *p_oggpacket )
 240 {
 241     pes_packet_t  *p_pes;
 242     data_packet_t *p_data;
 243     demux_sys_t *p_ogg = p_input->p_demux_data;
 244
 245     if( !( p_pes = input_NewPES( p_input->p_method_data ) ) )
 246     {
 247         return;
 248     }
 249     if( !( p_data = input_NewPacket( p_input->p_method_data,
 250                                      p_oggpacket->bytes ) ) )
 251     {
 252         input_DeletePES( p_input->p_method_data, p_pes );
 253         return;
 254     }
 255
 256     p_pes->p_first = p_pes->p_last = p_data;
 257     p_pes->i_nb_data = 1;
 258     p_pes->i_pes_size = p_oggpacket->bytes;
 259     p_pes->i_dts = p_oggpacket->granulepos;
 260
 261     /* Convert the pcr into a pts */
 262     p_pes->i_pts = ( p_stream->i_pcr < 0 ) ? 0 :
 263         input_ClockGetTS( p_input, p_input->stream.p_selected_program,
 264                           p_stream->i_pcr );
 265
 266     /* Convert the next granule into a pcr */
 267     p_stream->i_pcr = ( p_oggpacket->granulepos < 0 ) ? -1 :
 268                            p_oggpacket->granulepos * 90000 / p_stream->i_rate;
 269
 270     /* Update the main pcr */
 271     if( p_stream == p_ogg->p_stream_timeref )
 272     {
 273         if( p_ogg->p_stream_timeref->i_pcr >= 0 )
 274         {
 275             p_ogg->i_pcr = p_ogg->p_stream_timeref->i_pcr;
 276         }
 277         else
 278         {
 279             p_ogg->i_pcr += ( p_oggpacket->bytes * 90000
 280                               / p_stream->i_bitrate / 8 );
 281         }
 282     }
 283
 284     memcpy( p_data->p_payload_start, p_oggpacket->packet, p_oggpacket->bytes );
 285
 286     input_DecodePES( p_stream->p_es->p_decoder_fifo, p_pes );
 287 }
 288
 289 /****************************************************************************
 290  * Ogg_FindLogicalStreams: Find the logical streams embedded in the physical
 291  *                         stream and fill p_ogg.
 292  *****************************************************************************
 293  * The initial page of a logical stream is marked as a 'bos' page.
 294  * Furthermore, the Ogg specification mandates that grouped bitstreams begin
 295  * together and all of the initial pages must appear before any data pages.
 296  *
 297  * On success this function returns VLC_SUCCESS.
 298  ****************************************************************************/
 299 static int Ogg_FindLogicalStreams( input_thread_t *p_input, demux_sys_t *p_ogg)
 300 {
 301     ogg_packet oggpacket;
 302     ogg_page oggpage;
 303     int i_stream;
 304
 305     while( Ogg_ReadPage( p_input, p_ogg, &oggpage ) == VLC_SUCCESS )
 306     {
 307         if( ogg_page_bos( &oggpage ) )
 308         {
 309
 310             /* All is wonderful in our fine fine little world.
 311              * We found the beginning of our first logical stream. */
 312             while( ogg_page_bos( &oggpage ) )
 313             {
 314                 p_ogg->i_streams++;
 315                 p_ogg->pp_stream =
 316                     realloc( p_ogg->pp_stream, p_ogg->i_streams *
 317                              sizeof(logical_stream_t *) );
 318
 319 #define p_stream p_ogg->pp_stream[p_ogg->i_streams - 1]
 320
 321                 p_stream = malloc( sizeof(logical_stream_t) );
 322                 memset( p_stream, 0, sizeof(logical_stream_t) );
 323
 324                 /* Setup the logical stream */
 325                 p_stream->i_pages_read++;
 326                 p_stream->i_serial_no = ogg_page_serialno( &oggpage );
 327                 ogg_stream_init( &p_stream->os, p_stream->i_serial_no );
 328
 329                 /* The first stream we find is our timeref (might be changed
 330                  * later on) */
 331                 p_ogg->p_stream_timeref = p_stream;
 332
 333                 /* Extract the initial header from the first page and verify
 334                  * the codec type of tis Ogg bitstream */
 335                 if( ogg_stream_pagein( &p_stream->os, &oggpage ) < 0 )
 336                 {
 337                     /* error. stream version mismatch perhaps */
 338                     msg_Err( p_input, "Error reading first page of "
 339                              "Ogg bitstream data" );
 340                     return VLC_EGENERIC;
 341                 }
 342
 343                 /* FIXME: check return value */
 344                 ogg_stream_packetpeek( &p_stream->os, &oggpacket );
 345
 346                 /* Check for Vorbis header */
 347                 if( oggpacket.bytes >= 7 &&
 348                     ! strncmp( &oggpacket.packet[1], "vorbis", 6 ) )
 349                 {
 350                     oggpack_buffer opb;
 351
 352                     msg_Dbg( p_input, "found vorbis header" );
 353                     p_stream->i_cat = AUDIO_ES;
 354                     p_stream->i_fourcc = VLC_FOURCC( 'v','o','r','b' );
 355
 356                     /* Cheat and get additionnal info ;) */
 357                     oggpack_readinit( &opb, oggpacket.packet, oggpacket.bytes);
 358                     oggpack_adv( &opb, 96 );
 359                     p_stream->i_rate = oggpack_read( &opb, 32 );
 360                     oggpack_adv( &opb, 32 );
 361                     p_stream->i_bitrate = oggpack_read( &opb, 32 );
 362                 }
 363                 else
 364                 {
 365                     msg_Dbg( p_input, "found unknown codec" );
 366                     ogg_stream_destroy( &p_stream->os );
 367                     free( p_stream );
 368                     p_ogg->i_streams--;
 369                 }
 370
 371 #undef p_stream
 372
 373                 if( Ogg_ReadPage( p_input, p_ogg, &oggpage ) != VLC_SUCCESS )
 374                     return VLC_EGENERIC;
 375             }
 376
 377             /* This is the first data page, which means we are now finished
 378              * with the initial pages. We just need to store it in the relevant
 379              * bitstream. */
 380             for( i_stream = 0; i_stream < p_ogg->i_streams; i_stream++ )
 381             {
 382                 if( ogg_stream_pagein( &p_ogg->pp_stream[i_stream]->os,
 383                                        &oggpage ) == 0 )
 384                 {
 385                     p_ogg->pp_stream[i_stream]->i_pages_read++;
 386                     break;
 387                 }
 388             }
 389             return VLC_SUCCESS;
 390         }
 391     }
 392     return VLC_EGENERIC;
 393 }
 394
 395 /*****************************************************************************
 396  * Activate: initializes ogg demux structures
 397  *****************************************************************************/
 398 static int Activate( vlc_object_t * p_this )
 399 {
 400     int i_stream, b_forced;
 401     demux_sys_t    *p_ogg;
 402     input_thread_t *p_input = (input_thread_t *)p_this;
 403
 404     p_input->p_demux_data = NULL;
 405     b_forced = ( ( *p_input->psz_demux )&&
 406                  ( !strncmp( p_input->psz_demux, "ogg", 10 ) ) ) ? 1 : 0;
 407
 408     /* Check if we are dealing with an ogg stream */
 409     if( !b_forced && ( Ogg_Check( p_input ) != VLC_SUCCESS ) )
 410         return -1;
 411
 412     /* Allocate p_ogg */
 413     if( !( p_ogg = malloc( sizeof( demux_sys_t ) ) ) )
 414     {
 415         msg_Err( p_input, "out of memory" );
 416         goto error;
 417     }
 418     memset( p_ogg, 0, sizeof( demux_sys_t ) );
 419     p_input->p_demux_data = p_ogg;
 420
 421     p_ogg->i_pcr  = 0;
 422     p_ogg->p_stream_timeref = NULL;
 423     p_ogg->b_seekable = ( ( p_input->stream.b_seekable )
 424                         &&( p_input->stream.i_method == INPUT_METHOD_FILE ) );
 425
 426     /* Initialize the Ogg physical bitstream parser */
 427     ogg_sync_init( &p_ogg->oy );
 428
 429     /* Find the logical streams embedded in the physical stream and
 430      * initialize our p_ogg structure. */
 431     if( Ogg_FindLogicalStreams( p_input, p_ogg ) != VLC_SUCCESS )
 432     {
 433         msg_Err( p_input, "couldn't find an ogg logical stream" );
 434         goto error;
 435     }
 436
 437     /* Set the demux function */
 438     p_input->pf_demux = Demux;
 439
 440     /* Initialize access plug-in structures. */
 441     if( p_input->i_mtu == 0 )
 442     {
 443         /* Improve speed. */
 444         p_input->i_bufsize = INPUT_DEFAULT_BUFSIZE;
 445     }
 446
 447     /* Create one program */
 448     vlc_mutex_lock( &p_input->stream.stream_lock );
 449     if( input_InitStream( p_input, 0 ) == -1)
 450     {
 451         vlc_mutex_unlock( &p_input->stream.stream_lock );
 452         msg_Err( p_input, "cannot init stream" );
 453         goto error;
 454     }
 455     if( input_AddProgram( p_input, 0, 0) == NULL )
 456     {
 457         vlc_mutex_unlock( &p_input->stream.stream_lock );
 458         msg_Err( p_input, "cannot add program" );
 459         goto error;
 460     }
 461     p_input->stream.p_selected_program = p_input->stream.pp_programs[0];
 462     p_input->stream.i_mux_rate = 0;
 463     vlc_mutex_unlock( &p_input->stream.stream_lock );
 464
 465     for( i_stream = 0 ; i_stream < p_ogg->i_streams; i_stream++ )
 466     {
 467 #define p_stream p_ogg->pp_stream[i_stream]
 468         vlc_mutex_lock( &p_input->stream.stream_lock );
 469         p_stream->p_es = input_AddES( p_input,
 470                                       p_input->stream.p_selected_program,
 471                                       p_ogg->i_streams + 1, 0 );
 472         p_input->stream.i_mux_rate += (p_stream->i_bitrate / ( 8 * 50 ));
 473         vlc_mutex_unlock( &p_input->stream.stream_lock );
 474         p_stream->p_es->i_stream_id = i_stream;
 475         p_stream->p_es->i_fourcc = p_stream->i_fourcc;
 476         p_stream->p_es->i_cat = p_stream->i_cat;
 477 #undef p_stream
 478     }
 479
 480     for( i_stream = 0; i_stream < p_ogg->i_streams; i_stream++ )
 481     {
 482 #define p_stream  p_ogg->pp_stream[i_stream]
 483         switch( p_stream->p_es->i_cat )
 484         {
 485             case( VIDEO_ES ):
 486
 487                 if( (p_ogg->p_stream_video == NULL) )
 488                 {
 489                     p_ogg->p_stream_video = p_stream;
 490                     /* TODO add test to see if a decoder has been found */
 491                     Ogg_StreamStart( p_input, p_ogg, i_stream );
 492                 }
 493                 break;
 494
 495             case( AUDIO_ES ):
 496                 if( (p_ogg->p_stream_audio == NULL) )
 497                 {
 498                     p_ogg->p_stream_audio = p_stream;
 499                     p_ogg->p_stream_timeref = p_stream;
 500                     Ogg_StreamStart( p_input, p_ogg, i_stream );
 501                 }
 502                 break;
 503
 504             default:
 505                 break;
 506         }
 507 #undef p_stream
 508     }
 509
 510     /* we select the first audio and video ES */
 511     vlc_mutex_lock( &p_input->stream.stream_lock );
 512     if( !p_ogg->p_stream_video )
 513     {
 514         msg_Warn( p_input, "no video stream found" );
 515     }
 516     if( !p_ogg->p_stream_audio )
 517     {
 518         msg_Warn( p_input, "no audio stream found!" );
 519     }
 520     p_input->stream.p_selected_program->b_is_ok = 1;
 521     vlc_mutex_unlock( &p_input->stream.stream_lock );
 522
 523     /* Call the pace control */
 524     input_ClockManageRef( p_input,
 525                           p_input->stream.p_selected_program,
 526                           p_ogg->i_pcr );
 527
 528     return 0;
 529
 530  error:
 531     Deactivate( (vlc_object_t *)p_input );
 532     return -1;
 533
 534 }
 535
 536 /*****************************************************************************
 537  * Deactivate: frees unused data
 538  *****************************************************************************/
 539 static void Deactivate( vlc_object_t *p_this )
 540 {
 541     input_thread_t *p_input = (input_thread_t *)p_this;
 542     demux_sys_t *p_ogg = (demux_sys_t *)p_input->p_demux_data  ;
 543     int i;
 544
 545     if( p_ogg )
 546     {
 547         /* Cleanup the bitstream parser */
 548         ogg_sync_clear( &p_ogg->oy );
 549
 550         for( i = 0; i < p_ogg->i_streams; i++ )
 551         {
 552             ogg_stream_clear( &p_ogg->pp_stream[i]->os );
 553             free( p_ogg->pp_stream[i] );
 554         }
 555         if( p_ogg->pp_stream ) free( p_ogg->pp_stream );
 556
 557         free( p_ogg );
 558     }
 559 }
 560
 561 /*****************************************************************************
 562  * Demux: reads and demuxes data packets
 563  *****************************************************************************
 564  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 565  *****************************************************************************/
 566 static int Demux( input_thread_t * p_input )
 567 {
 568     int i, i_stream, b_eos = 0;
 569     ogg_page    oggpage;
 570     ogg_packet  oggpacket;
 571     demux_sys_t *p_ogg  = (demux_sys_t *)p_input->p_demux_data;
 572
 573 #define p_stream p_ogg->pp_stream[i_stream]
 574     /* detect new selected/unselected streams */
 575     for( i_stream = 0; i_stream < p_ogg->i_streams; i_stream++ )
 576     {
 577         if( p_stream->p_es )
 578         {
 579             if( p_stream->p_es->p_decoder_fifo &&
 580                 !p_stream->i_activated )
 581             {
 582                 Ogg_StreamStart( p_input, p_ogg, i_stream );
 583             }
 584             else
 585             if( !p_stream->p_es->p_decoder_fifo &&
 586                 p_stream->i_activated )
 587             {
 588                 Ogg_StreamStop( p_input, p_ogg, i_stream );
 589             }
 590         }
 591     }
 592
 593     /* search for new video and audio stream to select
 594      * if current have been unselected */
 595     if( ( !p_ogg->p_stream_video )
 596             || ( !p_ogg->p_stream_video->p_es->p_decoder_fifo ) )
 597     {
 598         p_ogg->p_stream_video = NULL;
 599         for( i_stream = 0; i_stream < p_ogg->i_streams; i_stream++ )
 600         {
 601             if( ( p_stream->i_cat == VIDEO_ES )
 602                   &&( p_stream->p_es->p_decoder_fifo ) )
 603             {
 604                 p_ogg->p_stream_video = p_stream;
 605                 break;
 606             }
 607         }
 608     }
 609     if( ( !p_ogg->p_stream_audio )
 610             ||( !p_ogg->p_stream_audio->p_es->p_decoder_fifo ) )
 611     {
 612         p_ogg->p_stream_audio = NULL;
 613         for( i_stream = 0; i_stream < p_ogg->i_streams; i_stream++ )
 614         {
 615             if( ( p_stream->i_cat == AUDIO_ES )
 616                   &&( p_stream->p_es->p_decoder_fifo ) )
 617             {
 618                 p_ogg->p_stream_audio = p_stream;
 619                 p_ogg->p_stream_timeref = p_stream;
 620                 break;
 621             }
 622         }
 623     }
 624
 625     if( p_input->stream.p_selected_program->i_synchro_state == SYNCHRO_REINIT )
 626     {
 627         msg_Warn( p_input, "synchro reinit" );
 628
 629         /* An ogg packet does only contain the starting date of the next
 630          * packet, not its own starting date.
 631          * As a quick work around, we just skip an oggpage */
 632
 633         for( i_stream = 0; i_stream < p_ogg->i_streams; i_stream++ )
 634         {
 635             /* we'll trash all the data until we find the next pcr */
 636             p_stream->b_reinit = 1;
 637             p_ogg->i_pcr = 0;
 638         }
 639     }
 640
 641
 642     /* Demux ogg pages from the stream */
 643     for( i = 0; (i < PAGES_READ_ONCE) || p_ogg->p_stream_timeref->b_reinit;
 644          i++ )
 645     {
 646         if( Ogg_ReadPage( p_input, p_ogg, &oggpage ) != VLC_SUCCESS )
 647         {
 648             b_eos = 1;
 649             break;
 650         }
 651
 652         for( i_stream = 0; i_stream < p_ogg->i_streams; i_stream++ )
 653         {
 654             /* FIXME: we already read the header */
 655
 656             if( ogg_stream_pagein( &p_stream->os, &oggpage ) != 0 )
 657                 continue;
 658
 659             while( ogg_stream_packetout( &p_stream->os, &oggpacket ) > 0 )
 660             {
 661                 if( !p_stream->p_es ||
 662                     !p_stream->p_es->p_decoder_fifo )
 663                 {
 664                     break;
 665                 }
 666
 667                 if( p_stream->b_reinit )
 668                 {
 669                     if( oggpacket.granulepos >= 0 )
 670                     {
 671                         p_stream->b_reinit = 0;
 672                         p_stream->i_pcr = oggpacket.granulepos
 673                             * 90000 / p_stream->i_rate;
 674
 675                         if( !p_ogg->i_pcr ||
 676                             (p_stream == p_ogg->p_stream_timeref) )
 677                         {
 678                             /* Call the pace control to reinitialize
 679                              * the system clock */
 680                             p_ogg->i_pcr = p_stream->i_pcr;
 681                             input_ClockManageRef( p_input,
 682                                p_input->stream.p_selected_program,
 683                                p_ogg->i_pcr );
 684                         }
 685                     }
 686                     continue;
 687                 }
 688
 689                 Ogg_DecodePacket( p_input, p_stream, &oggpacket );
 690
 691             }
 692         }
 693 #undef p_stream
 694     }
 695
 696     /* Call the pace control */
 697     if( !b_eos ) input_ClockManageRef( p_input,
 698                                        p_input->stream.p_selected_program,
 699                                        p_ogg->i_pcr );
 700
 701     /* Did we reach the end of stream ? */
 702     return( b_eos ? 0 : 1 );
 703 }