git.sesse.net Git - vlc/blob - plugins/mpeg/input_ps.c

   1 /*****************************************************************************
   2  * input_ps.c: PS demux and packet management
   3  *****************************************************************************
   4  * Copyright (C) 1998, 1999, 2000 VideoLAN
   5  * $Id: input_ps.c,v 1.12 2001/04/05 14:00:28 asmax Exp $
   6  *
   7  * Authors: Christophe Massiot <massiot@via.ecp.fr>
   8  *          Cyril Deguet <asmax@via.ecp.fr>
   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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  23  *****************************************************************************/
  24
  25 #define MODULE_NAME ps
  26 #include "modules_inner.h"
  27
  28 /*****************************************************************************
  29  * Preamble
  30  *****************************************************************************/
  31 #include "defs.h"
  32
  33 #include <stdlib.h>
  34 #include <string.h>
  35 #include <errno.h>
  36
  37 #include <sys/types.h>
  38 #include <sys/stat.h>
  39 #include <unistd.h>
  40 #include <fcntl.h>
  41
  42 #include "config.h"
  43 #include "common.h"
  44 #include "threads.h"
  45 #include "mtime.h"
  46 #include "tests.h"
  47
  48 #include "intf_msg.h"
  49
  50 #include "main.h"
  51
  52 #include "stream_control.h"
  53 #include "input_ext-intf.h"
  54 #include "input_ext-dec.h"
  55
  56 #include "input.h"
  57
  58 #include "input_ps.h"
  59 #include "mpeg_system.h"
  60
  61 #include "debug.h"
  62
  63 #include "modules.h"
  64
  65 /*****************************************************************************
  66  * Local prototypes
  67  *****************************************************************************/
  68 static int  PSProbe     ( probedata_t * );
  69 static int  PSRead      ( struct input_thread_s *,
  70                           data_packet_t * p_packets[INPUT_READ_ONCE] );
  71 static void PSInit      ( struct input_thread_s * );
  72 static void PSEnd       ( struct input_thread_s * );
  73 static void PSSeek      ( struct input_thread_s *, off_t );
  74 static struct pes_packet_s *  NewPES    ( void * );
  75 static struct data_packet_s * NewPacket ( void *, size_t );
  76 static void DeletePacket( void *, struct data_packet_s * );
  77 static void DeletePES   ( void *, struct pes_packet_s * );
  78
  79 /*****************************************************************************
  80  * Functions exported as capabilities. They are declared as static so that
  81  * we don't pollute the namespace too much.
  82  *****************************************************************************/
  83 void _M( input_getfunctions )( function_list_t * p_function_list )
  84 {
  85 #define input p_function_list->functions.input
  86     p_function_list->pf_probe = PSProbe;
  87     input.pf_init             = PSInit;
  88     input.pf_open             = input_FileOpen;
  89     input.pf_close            = input_FileClose;
  90     input.pf_end              = PSEnd;
  91     input.pf_set_area         = NULL;
  92     input.pf_read             = PSRead;
  93     input.pf_demux            = input_DemuxPS;
  94     input.pf_new_packet       = NewPacket;
  95     input.pf_new_pes          = NewPES;
  96     input.pf_delete_packet    = DeletePacket;
  97     input.pf_delete_pes       = DeletePES;
  98     input.pf_rewind           = NULL;
  99     input.pf_seek             = PSSeek;
 100 #undef input
 101 }
 102
 103 /*
 104  * Data reading functions
 105  */
 106
 107 /*****************************************************************************
 108  * PSProbe: verifies that the stream is a PS stream
 109  *****************************************************************************/
 110 static int PSProbe( probedata_t *p_data )
 111 {
 112     input_thread_t * p_input = (input_thread_t *)p_data;
 113
 114     char * psz_name = p_input->p_source;
 115     int i_handle;
 116     int i_score = 10;
 117
 118     if( TestMethod( INPUT_METHOD_VAR, "ps" ) )
 119     {
 120         return( 999 );
 121     }
 122
 123     if( ( strlen(psz_name) > 5 ) && !strncasecmp( psz_name, "file:", 5 ) )
 124     {
 125         /* If the user specified "file:" then it's probably a file */
 126         i_score = 100;
 127         psz_name += 5;
 128     }
 129
 130     i_handle = open( psz_name, 0 );
 131     if( i_handle == -1 )
 132     {
 133         return( 0 );
 134     }
 135     close( i_handle );
 136
 137     return( i_score );
 138 }
 139
 140 /*****************************************************************************
 141  * PSInit: initializes PS structures
 142  *****************************************************************************/
 143 static void PSInit( input_thread_t * p_input )
 144 {
 145     thread_ps_data_t *  p_method;
 146     packet_cache_t *    p_packet_cache;
 147
 148     if( (p_method =
 149          (thread_ps_data_t *)malloc( sizeof(thread_ps_data_t) )) == NULL )
 150     {
 151         intf_ErrMsg( "Out of memory" );
 152         p_input->b_error = 1;
 153         return;
 154     }
 155     p_input->p_plugin_data = (void *)p_method;
 156
 157     /* creates the packet cache structure */
 158     p_packet_cache = malloc( sizeof(packet_cache_t) );
 159     if ( p_packet_cache == NULL )
 160     {
 161         intf_ErrMsg( "Out of memory" );
 162         p_input->b_error = 1;
 163         return;
 164     }
 165     p_input->p_method_data = (void *)p_packet_cache;
 166
 167     /* allocates the data cache */
 168     p_packet_cache->data.p_stack = malloc( DATA_CACHE_SIZE *
 169         sizeof(data_packet_t*) );
 170     if ( p_packet_cache->data.p_stack == NULL )
 171     {
 172         intf_ErrMsg( "Out of memory" );
 173         p_input->b_error = 1;
 174         return;
 175     }
 176     p_packet_cache->data.l_index = 0;
 177
 178     /* allocates the PES cache */
 179     p_packet_cache->pes.p_stack = malloc( PES_CACHE_SIZE *
 180         sizeof(pes_packet_t*) );
 181     if ( p_packet_cache->pes.p_stack == NULL )
 182     {
 183         intf_ErrMsg( "Out of memory" );
 184         p_input->b_error = 1;
 185         return;
 186     }
 187     p_packet_cache->pes.l_index = 0;
 188
 189     /* allocates the small buffer cache */
 190     p_packet_cache->small.p_stack = malloc( SMALL_CACHE_SIZE *
 191         sizeof(packet_buffer_t) );
 192     if ( p_packet_cache->small.p_stack == NULL )
 193     {
 194         intf_ErrMsg( "Out of memory" );
 195         p_input->b_error = 1;
 196         return;
 197     }
 198     p_packet_cache->small.l_index = 0;
 199
 200     /* allocates the large buffer cache */
 201     p_packet_cache->large.p_stack = malloc( LARGE_CACHE_SIZE *
 202         sizeof(packet_buffer_t) );
 203     if ( p_packet_cache->large.p_stack == NULL )
 204     {
 205         intf_ErrMsg( "Out of memory" );
 206         p_input->b_error = 1;
 207         return;
 208     }
 209     p_packet_cache->large.l_index = 0;
 210
 211     /* Re-open the socket as a buffered FILE stream */
 212     if( (p_method->stream = fdopen( p_input->i_handle, "r" )) == NULL )
 213     {
 214         intf_ErrMsg( "Cannot open file (%s)", strerror(errno) );
 215         p_input->b_error = 1;
 216         return;
 217     }
 218     rewind( p_method->stream );
 219
 220     /* FIXME : detect if InitStream failed */
 221     input_InitStream( p_input, sizeof( stream_ps_data_t ) );
 222     input_AddProgram( p_input, 0, sizeof( stream_ps_data_t ) );
 223
 224     if( p_input->stream.b_seekable )
 225     {
 226         stream_ps_data_t * p_demux_data =
 227              (stream_ps_data_t *)p_input->stream.pp_programs[0]->p_demux_data;
 228
 229         /* Pre-parse the stream to gather stream_descriptor_t. */
 230         p_input->stream.pp_programs[0]->b_is_ok = 0;
 231         p_demux_data->i_PSM_version = EMPTY_PSM_VERSION;
 232
 233         while( !p_input->b_die && !p_input->b_error
 234                 && !p_demux_data->b_has_PSM )
 235         {
 236             int                 i_result, i;
 237             data_packet_t *     pp_packets[INPUT_READ_ONCE];
 238
 239             i_result = PSRead( p_input, pp_packets );
 240             if( i_result == 1 )
 241             {
 242                 /* EOF */
 243                 vlc_mutex_lock( &p_input->stream.stream_lock );
 244                 p_input->stream.pp_programs[0]->b_is_ok = 1;
 245                 vlc_mutex_unlock( &p_input->stream.stream_lock );
 246                 break;
 247             }
 248             if( i_result == -1 )
 249             {
 250                 p_input->b_error = 1;
 251                 break;
 252             }
 253
 254             for( i = 0; i < INPUT_READ_ONCE && pp_packets[i] != NULL; i++ )
 255             {
 256                 /* FIXME: use i_p_config_t */
 257                 input_ParsePS( p_input, pp_packets[i] );
 258                 DeletePacket( p_input->p_method_data, pp_packets[i] );
 259             }
 260
 261             /* File too big. */
 262             if( p_input->stream.p_selected_area->i_tell >
 263                                                     INPUT_PREPARSE_LENGTH )
 264             {
 265                 break;
 266             }
 267         }
 268         rewind( p_method->stream );
 269         vlc_mutex_lock( &p_input->stream.stream_lock );
 270         p_input->stream.p_selected_area->i_tell = 0;
 271         if( p_demux_data->b_has_PSM )
 272         {
 273             /* (The PSM decoder will care about spawning the decoders) */
 274             p_input->stream.pp_programs[0]->b_is_ok = 1;
 275         }
 276 #ifdef AUTO_SPAWN
 277         else
 278         {
 279             /* (We have to do it ourselves) */
 280             int                 i_es;
 281
 282             /* FIXME: we should do multiple passes in case an audio type
 283              * is not present */
 284             for( i_es = 0;
 285                  i_es < p_input->stream.pp_programs[0]->i_es_number;
 286                  i_es++ )
 287             {
 288 #define p_es p_input->stream.pp_programs[0]->pp_es[i_es]
 289                 switch( p_es->i_type )
 290                 {
 291                     case MPEG1_VIDEO_ES:
 292                     case MPEG2_VIDEO_ES:
 293                         input_SelectES( p_input, p_es );
 294                         break;
 295
 296                     case MPEG1_AUDIO_ES:
 297                     case MPEG2_AUDIO_ES:
 298                         if( main_GetIntVariable( INPUT_CHANNEL_VAR, 0 )
 299                                 == (p_es->i_id & 0x1F) )
 300                         switch( main_GetIntVariable( INPUT_AUDIO_VAR, 0 ) )
 301                         {
 302                         case 0:
 303                             main_PutIntVariable( INPUT_AUDIO_VAR,
 304                                                  REQUESTED_MPEG );
 305                         case REQUESTED_MPEG:
 306                             input_SelectES( p_input, p_es );
 307                         }
 308                         break;
 309
 310                     case AC3_AUDIO_ES:
 311                         if( main_GetIntVariable( INPUT_CHANNEL_VAR, 0 )
 312                                 == ((p_es->i_id & 0xF00) >> 8) )
 313                         switch( main_GetIntVariable( INPUT_AUDIO_VAR, 0 ) )
 314                         {
 315                         case 0:
 316                             main_PutIntVariable( INPUT_AUDIO_VAR,
 317                                                  REQUESTED_AC3 );
 318                         case REQUESTED_AC3:
 319                             input_SelectES( p_input, p_es );
 320                         }
 321                         break;
 322
 323                     case DVD_SPU_ES:
 324                         if( main_GetIntVariable( INPUT_SUBTITLE_VAR, -1 )
 325                                 == ((p_es->i_id & 0x1F00) >> 8) )
 326                         {
 327                             input_SelectES( p_input, p_es );
 328                         }
 329                         break;
 330
 331                     case LPCM_AUDIO_ES:
 332                         /* FIXME ! */
 333                         break;
 334                 }
 335             }
 336
 337         }
 338 #endif
 339 #ifdef STATS
 340         input_DumpStream( p_input );
 341 #endif
 342         vlc_mutex_unlock( &p_input->stream.stream_lock );
 343     }
 344     else
 345     {
 346         /* The programs will be added when we read them. */
 347         vlc_mutex_lock( &p_input->stream.stream_lock );
 348         p_input->stream.pp_programs[0]->b_is_ok = 0;
 349         vlc_mutex_unlock( &p_input->stream.stream_lock );
 350     }
 351 }
 352
 353 /*****************************************************************************
 354  * PSEnd: frees unused data
 355  *****************************************************************************/
 356 static void PSEnd( input_thread_t * p_input )
 357 {
 358     free( p_input->p_plugin_data );
 359 }
 360
 361 /*****************************************************************************
 362  * SafeRead: reads a chunk of stream and correctly detects errors
 363  *****************************************************************************/
 364 static __inline__ int SafeRead( input_thread_t * p_input, byte_t * p_buffer,
 365                                 size_t i_len )
 366 {
 367     thread_ps_data_t *  p_method;
 368     int                 i_error;
 369
 370     p_method = (thread_ps_data_t *)p_input->p_plugin_data;
 371     while( fread( p_buffer, i_len, 1, p_method->stream ) != 1 )
 372     {
 373         if( feof( p_method->stream ) )
 374         {
 375             return( 1 );
 376         }
 377
 378         if( (i_error = ferror( p_method->stream )) )
 379         {
 380             intf_ErrMsg( "Read failed (%s)", strerror(i_error) );
 381             return( -1 );
 382         }
 383     }
 384     vlc_mutex_lock( &p_input->stream.stream_lock );
 385     p_input->stream.p_selected_area->i_tell += i_len;
 386     vlc_mutex_unlock( &p_input->stream.stream_lock );
 387     return( 0 );
 388 }
 389
 390 /*****************************************************************************
 391  * PSRead: reads data packets
 392  *****************************************************************************
 393  * Returns -1 in case of error, 0 if everything went well, and 1 in case of
 394  * EOF.
 395  *****************************************************************************/
 396 static int PSRead( input_thread_t * p_input,
 397                    data_packet_t * pp_packets[INPUT_READ_ONCE] )
 398 {
 399     byte_t              p_header[6];
 400     data_packet_t *     p_data;
 401     size_t              i_packet_size;
 402     int                 i_packet, i_error;
 403     thread_ps_data_t *  p_method;
 404
 405     p_method = (thread_ps_data_t *)p_input->p_plugin_data;
 406
 407     memset( pp_packets, 0, INPUT_READ_ONCE * sizeof(data_packet_t *) );
 408     for( i_packet = 0; i_packet < INPUT_READ_ONCE; i_packet++ )
 409     {
 410         /* Read what we believe to be a packet header. */
 411         if( (i_error = SafeRead( p_input, p_header, 6 )) )
 412         {
 413             return( i_error );
 414         }
 415
 416         if( (U32_AT(p_header) & 0xFFFFFF00) != 0x100L )
 417         {
 418             /* This is not the startcode of a packet. Read the stream
 419              * until we find one. */
 420             u32         i_startcode = U32_AT(p_header);
 421             int         i_dummy;
 422
 423             if( i_startcode )
 424             {
 425                 /* It is common for MPEG-1 streams to pad with zeros
 426                  * (although it is forbidden by the recommendation), so
 427                  * don't bother everybody in this case. */
 428                 intf_WarnMsg( 1, "Garbage at input (%.8x)", i_startcode );
 429             }
 430
 431             while( (i_startcode & 0xFFFFFF00) != 0x100L )
 432             {
 433                 i_startcode <<= 8;
 434                 if( (i_dummy = getc( p_method->stream )) != EOF )
 435                 {
 436                     i_startcode |= i_dummy;
 437                 }
 438                 else
 439                 {
 440                     return( 1 );
 441                 }
 442             }
 443             /* Packet found. */
 444             *(u32 *)p_header = U32_AT(&i_startcode);
 445             if( (i_error = SafeRead( p_input, p_header + 4, 2 )) )
 446             {
 447                 return( i_error );
 448             }
 449         }
 450
 451         if( U32_AT(p_header) != 0x1BA )
 452         {
 453             /* That's the case for all packets, except pack header. */
 454             i_packet_size = U16_AT(&p_header[4]);
 455         }
 456         else
 457         {
 458             /* Pack header. */
 459             if( (p_header[4] & 0xC0) == 0x40 )
 460             {
 461                 /* MPEG-2 */
 462                 i_packet_size = 8;
 463             }
 464             else if( (p_header[4] & 0xF0) == 0x20 )
 465             {
 466                 /* MPEG-1 */
 467                 i_packet_size = 6;
 468             }
 469             else
 470             {
 471                 intf_ErrMsg( "Unable to determine stream type" );
 472                 return( -1 );
 473             }
 474         }
 475
 476         /* Fetch a packet of the appropriate size. */
 477         if( (p_data = NewPacket( p_input->p_method_data, i_packet_size + 6 ))
 478             == NULL )
 479         {
 480             intf_ErrMsg( "Out of memory" );
 481             return( -1 );
 482         }
 483
 484         /* Copy the header we already read. */
 485         memcpy( p_data->p_buffer, p_header, 6 );
 486
 487         /* Read the remaining of the packet. */
 488         if( i_packet_size && (i_error =
 489                 SafeRead( p_input, p_data->p_buffer + 6, i_packet_size )) )
 490         {
 491             return( i_error );
 492         }
 493
 494         /* In MPEG-2 pack headers we still have to read stuffing bytes. */
 495         if( U32_AT(p_header) == 0x1BA )
 496         {
 497             if( i_packet_size == 8 && (p_data->p_buffer[13] & 0x7) != 0 )
 498             {
 499                 /* MPEG-2 stuffing bytes */
 500                 byte_t      p_garbage[8];
 501                 if( (i_error = SafeRead( p_input, p_garbage,
 502                                          p_data->p_buffer[13] & 0x7)) )
 503                 {
 504                     return( i_error );
 505                 }
 506             }
 507         }
 508
 509         /* Give the packet to the other input stages. */
 510         pp_packets[i_packet] = p_data;
 511 //fprintf(stderr, "read2 %li %li\n", p_data, p_data->l_size);
 512     }
 513
 514     return( 0 );
 515 }
 516
 517 /*****************************************************************************
 518  * PSSeek: changes the stream position indicator
 519  *****************************************************************************/
 520 static void PSSeek( input_thread_t * p_input, off_t i_position )
 521 {
 522     thread_ps_data_t *  p_method;
 523
 524     p_method = (thread_ps_data_t *)p_input->p_plugin_data;
 525
 526     /* A little bourrin but should work for a while --Meuuh */
 527     fseeko( p_method->stream, i_position, SEEK_SET );
 528
 529     p_input->stream.p_selected_area->i_tell = i_position;
 530 }
 531
 532 /*
 533  * Packet management utilities
 534  */
 535
 536
 537 /*****************************************************************************
 538  * NewPacket: allocates a data packet
 539  *****************************************************************************/
 540 static struct data_packet_s * NewPacket( void * p_packet_cache,
 541                                          size_t l_size )
 542 {
 543     packet_cache_t *   p_cache;
 544     data_packet_t *    p_data;
 545     long               l_index;
 546
 547     if ( (p_cache = (packet_cache_t *)p_packet_cache) == NULL )
 548     {
 549         intf_ErrMsg( "PPacket cache not initialized" );
 550         return NULL;
 551     }
 552     /* Safety check */
 553     if( l_size > INPUT_MAX_PACKET_SIZE )
 554     {
 555         intf_ErrMsg( "Packet too big (%d)", l_size );
 556         return NULL;
 557     }
 558
 559     /* Checks whether the data cache is empty */
 560     if( p_cache->data.l_index == 0 )
 561     {
 562         /* Allocates a new packet */
 563         if ( (p_data = malloc( sizeof(data_packet_t) )) == NULL )
 564         {
 565             intf_DbgMsg( "Out of memory" );
 566             return NULL;
 567         }
 568     }
 569     else
 570     {
 571         /* Takes the packet out from the cache */
 572         if( (p_data = p_cache->data.p_stack[ -- p_cache->data.l_index ])
 573             == NULL )
 574         {
 575             intf_DbgMsg( "NULL packet in the data cache" );
 576             return NULL;
 577         }
 578     }
 579
 580     if( l_size < MAX_SMALL_SIZE )
 581     {
 582         /* Small buffer */
 583
 584         /* Checks whether the buffer cache is empty */
 585         if( p_cache->small.l_index == 0 )
 586         {
 587             /* Allocates a new packet */
 588             if ( (p_data->p_buffer = malloc( l_size )) == NULL )
 589             {
 590                 intf_DbgMsg( "Out of memory" );
 591                 free( p_data );
 592                 return NULL;
 593             }
 594             p_data->l_size = l_size;
 595         }
 596         else
 597         {
 598             /* Takes the packet out from the cache */
 599             l_index = -- p_cache->small.l_index;
 600             if( (p_data->p_buffer = p_cache->small.p_stack[l_index].p_data)
 601                 == NULL )
 602             {
 603                 intf_DbgMsg( "NULL packet in the small buffer cache" );
 604                 free( p_data );
 605                 return NULL;
 606             }
 607                 /* Reallocates the packet if it is too small or too large */
 608             if( p_cache->small.p_stack[l_index].l_size < l_size ||
 609                 p_cache->small.p_stack[l_index].l_size > 2*l_size )
 610             {
 611                 p_data->p_buffer = realloc( p_data->p_buffer, l_size );
 612                 p_data->l_size = l_size;
 613             }
 614             else
 615             {
 616                 p_data->l_size = p_cache->small.p_stack[l_index].l_size;
 617             }
 618         }
 619     }
 620     else
 621     {
 622         /* Large buffer */
 623
 624         /* Checks whether the buffer cache is empty */
 625         if( p_cache->large.l_index == 0 )
 626         {
 627             /* Allocates a new packet */
 628             if ( (p_data->p_buffer = malloc( l_size )) == NULL )
 629             {
 630                 intf_DbgMsg( "Out of memory" );
 631                 free( p_data );
 632                 return NULL;
 633             }
 634             p_data->l_size = l_size;
 635         }
 636         else
 637         {
 638             /* Takes the packet out from the cache */
 639             l_index = -- p_cache->large.l_index;
 640             if( (p_data->p_buffer = p_cache->large.p_stack[l_index].p_data)
 641                 == NULL )
 642             {
 643                 intf_DbgMsg( "NULL packet in the small buffer cache" );
 644                 free( p_data );
 645                 return NULL;
 646             }
 647                 /* Reallocates the packet if it is too small or too large */
 648             if( p_cache->large.p_stack[l_index].l_size < l_size ||
 649                 p_cache->large.p_stack[l_index].l_size > 2*l_size )
 650             {
 651                 p_data->p_buffer = realloc( p_data->p_buffer, l_size );
 652                 p_data->l_size = l_size;
 653             }
 654             else
 655             {
 656                 p_data->l_size = p_cache->large.p_stack[l_index].l_size;
 657             }
 658             }
 659     }
 660
 661     /* Initialize data */
 662     p_data->p_next = NULL;
 663     p_data->b_discard_payload = 0;
 664     p_data->p_payload_start = p_data->p_buffer;
 665     p_data->p_payload_end = p_data->p_buffer + l_size;
 666
 667 //fprintf(stderr, "addr: %li %li buf %li\n", p_data, p_data->l_size, p_data->p_buffer);
 668     return( p_data );
 669
 670 }
 671
 672
 673 /*****************************************************************************
 674  * NewPES: allocates a pes packet
 675  *****************************************************************************/
 676 static pes_packet_t * NewPES( void * p_packet_cache )
 677 {
 678     packet_cache_t *   p_cache;
 679     pes_packet_t *     p_pes;
 680
 681     if ( (p_cache = (packet_cache_t *)p_packet_cache) == NULL )
 682     {
 683         intf_ErrMsg( "Packet cache not initialized" );
 684         return NULL;
 685     }
 686     /* Checks whether the PES cache is empty */
 687     if( p_cache->pes.l_index == 0 )
 688     {
 689         /* Allocates a new packet */
 690         if ( (p_pes = malloc( sizeof(pes_packet_t) )) == NULL )
 691         {
 692             intf_DbgMsg( "Out of memory" );
 693             return NULL;
 694         }
 695     }
 696     else
 697     {
 698         /* Takes the packet out from the cache */
 699         if( (p_pes = p_cache->pes.p_stack[ -- p_cache->pes.l_index ])
 700             == NULL )
 701         {
 702             intf_DbgMsg( "NULL packet in the data cache" );
 703             return NULL;
 704         }
 705     }
 706
 707     p_pes->b_data_alignment = p_pes->b_discontinuity =
 708         p_pes->i_pts = p_pes->i_dts = 0;
 709     p_pes->i_pes_size = 0;
 710     p_pes->p_first = NULL;
 711
 712     return( p_pes );
 713
 714 }
 715
 716 /*****************************************************************************
 717  * DeletePacket: deletes a data packet
 718  *****************************************************************************/
 719 static void DeletePacket( void * p_packet_cache,
 720                           data_packet_t * p_data )
 721 {
 722     packet_cache_t *   p_cache;
 723
 724     if ( (p_cache = (packet_cache_t *)p_packet_cache) == NULL )
 725     {
 726         intf_ErrMsg( "Packet cache not initialized" );
 727         return;
 728     }
 729
 730         ASSERT( p_data );
 731
 732     /* Checks whether the data cache is full */
 733     if ( p_cache->data.l_index < DATA_CACHE_SIZE )
 734     {
 735         /* Cache not full: store the packet in it */
 736         p_cache->data.p_stack[ p_cache->data.l_index ++ ] = p_data;
 737         /* Small buffer or large buffer? */
 738         if ( p_data->l_size < MAX_SMALL_SIZE )
 739         {
 740             /* Checks whether the small buffer cache is full */
 741             if ( p_cache->small.l_index < SMALL_CACHE_SIZE )
 742             {
 743                 p_cache->small.p_stack[ p_cache->small.l_index ].l_size =
 744                     p_data->l_size;
 745                 p_cache->small.p_stack[ p_cache->small.l_index ++ ].p_data =
 746                     p_data->p_buffer;
 747             }
 748             else
 749             {
 750                 ASSERT( p_data->p_buffer );
 751                 free( p_data->p_buffer );
 752             }
 753         }
 754         else
 755         {
 756             /* Checks whether the large buffer cache is full */
 757             if ( p_cache->large.l_index < LARGE_CACHE_SIZE )
 758             {
 759                 p_cache->large.p_stack[ p_cache->large.l_index ].l_size =
 760                     p_data->l_size;
 761                 p_cache->large.p_stack[ p_cache->large.l_index ++ ].p_data =
 762                     p_data->p_buffer;
 763             }
 764             else
 765             {
 766                 ASSERT( p_data->p_buffer );
 767                 free( p_data->p_buffer );
 768             }
 769         }
 770     }
 771     else
 772     {
 773         /* Cache full: the packet must be freed */
 774         free( p_data->p_buffer );
 775         free( p_data );
 776     }
 777
 778 }
 779
 780 /*****************************************************************************
 781  * DeletePES: deletes a PES packet and associated data packets
 782  *****************************************************************************/
 783 static void DeletePES( void * p_packet_cache, pes_packet_t * p_pes )
 784 {
 785     packet_cache_t *    p_cache;
 786     data_packet_t *     p_data;
 787     data_packet_t *     p_next;
 788
 789     if ( (p_cache = (packet_cache_t *)p_packet_cache) == NULL )
 790     {
 791         intf_ErrMsg( "Packet cache not initialized" );
 792         return;
 793     }
 794
 795     ASSERT( p_pes);
 796
 797     p_data = p_pes->p_first;
 798
 799     while( p_data != NULL )
 800     {
 801         p_next = p_data->p_next;
 802         DeletePacket( p_cache, p_data );
 803         p_data = p_next;
 804     }
 805
 806     /* Checks whether the PES cache is full */
 807     if ( p_cache->pes.l_index < PES_CACHE_SIZE )
 808     {
 809         /* Cache not full: store the packet in it */
 810         p_cache->pes.p_stack[ p_cache->pes.l_index ++ ] = p_pes;
 811     }
 812     else
 813     {
 814         /* Cache full: the packet must be freed */
 815         free( p_pes );
 816     }
 817 }
 818