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 1.16 2001/04/20 05:40:03 stef 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
 271         p_input->stream.i_method = INPUT_METHOD_FILE;
 272         p_input->stream.p_selected_area->i_tell = 0;
 273
 274         if( p_demux_data->b_has_PSM )
 275         {
 276             /* (The PSM decoder will care about spawning the decoders) */
 277             p_input->stream.pp_programs[0]->b_is_ok = 1;
 278         }
 279 #ifdef AUTO_SPAWN
 280         else
 281         {
 282             /* (We have to do it ourselves) */
 283             int                 i_es;
 284
 285             /* FIXME: we should do multiple passes in case an audio type
 286              * is not present */
 287             for( i_es = 0;
 288                  i_es < p_input->stream.pp_programs[0]->i_es_number;
 289                  i_es++ )
 290             {
 291 #define p_es p_input->stream.pp_programs[0]->pp_es[i_es]
 292                 switch( p_es->i_type )
 293                 {
 294                     case MPEG1_VIDEO_ES:
 295                     case MPEG2_VIDEO_ES:
 296                         input_SelectES( p_input, p_es );
 297                         break;
 298
 299                     case MPEG1_AUDIO_ES:
 300                     case MPEG2_AUDIO_ES:
 301                         if( main_GetIntVariable( INPUT_CHANNEL_VAR, 0 )
 302                                 == (p_es->i_id & 0x1F) )
 303                         switch( main_GetIntVariable( INPUT_AUDIO_VAR, 0 ) )
 304                         {
 305                         case 0:
 306                             main_PutIntVariable( INPUT_AUDIO_VAR,
 307                                                  REQUESTED_MPEG );
 308                         case REQUESTED_MPEG:
 309                             input_SelectES( p_input, p_es );
 310                         }
 311                         break;
 312
 313                     case AC3_AUDIO_ES:
 314                         if( main_GetIntVariable( INPUT_CHANNEL_VAR, 0 )
 315                                 == ((p_es->i_id & 0xF00) >> 8) )
 316                         switch( main_GetIntVariable( INPUT_AUDIO_VAR, 0 ) )
 317                         {
 318                         case 0:
 319                             main_PutIntVariable( INPUT_AUDIO_VAR,
 320                                                  REQUESTED_AC3 );
 321                         case REQUESTED_AC3:
 322                             input_SelectES( p_input, p_es );
 323                         }
 324                         break;
 325
 326                     case DVD_SPU_ES:
 327                         if( main_GetIntVariable( INPUT_SUBTITLE_VAR, -1 )
 328                                 == ((p_es->i_id & 0x1F00) >> 8) )
 329                         {
 330                             input_SelectES( p_input, p_es );
 331                         }
 332                         break;
 333
 334                     case LPCM_AUDIO_ES:
 335                         /* FIXME ! */
 336                         break;
 337                 }
 338             }
 339
 340         }
 341 #endif
 342 #ifdef STATS
 343         input_DumpStream( p_input );
 344 #endif
 345         vlc_mutex_unlock( &p_input->stream.stream_lock );
 346     }
 347     else
 348     {
 349         /* The programs will be added when we read them. */
 350         vlc_mutex_lock( &p_input->stream.stream_lock );
 351         p_input->stream.pp_programs[0]->b_is_ok = 0;
 352         vlc_mutex_unlock( &p_input->stream.stream_lock );
 353     }
 354 }
 355
 356 /*****************************************************************************
 357  * PSEnd: frees unused data
 358  *****************************************************************************/
 359 static void PSEnd( input_thread_t * p_input )
 360 {
 361     free( p_input->p_plugin_data );
 362 }
 363
 364 /*****************************************************************************
 365  * SafeRead: reads a chunk of stream and correctly detects errors
 366  *****************************************************************************/
 367 static __inline__ int SafeRead( input_thread_t * p_input, byte_t * p_buffer,
 368                                 size_t i_len )
 369 {
 370     thread_ps_data_t *  p_method;
 371     int                 i_error;
 372
 373     p_method = (thread_ps_data_t *)p_input->p_plugin_data;
 374     while( fread( p_buffer, i_len, 1, p_method->stream ) != 1 )
 375     {
 376         if( feof( p_method->stream ) )
 377         {
 378             return( 1 );
 379         }
 380
 381         if( (i_error = ferror( p_method->stream )) )
 382         {
 383             intf_ErrMsg( "Read failed (%s)", strerror(i_error) );
 384             return( -1 );
 385         }
 386     }
 387     vlc_mutex_lock( &p_input->stream.stream_lock );
 388     p_input->stream.p_selected_area->i_tell += i_len;
 389     vlc_mutex_unlock( &p_input->stream.stream_lock );
 390     return( 0 );
 391 }
 392
 393 /*****************************************************************************
 394  * PSRead: reads data packets
 395  *****************************************************************************
 396  * Returns -1 in case of error, 0 if everything went well, and 1 in case of
 397  * EOF.
 398  *****************************************************************************/
 399 static int PSRead( input_thread_t * p_input,
 400                    data_packet_t * pp_packets[INPUT_READ_ONCE] )
 401 {
 402     byte_t              p_header[6];
 403     data_packet_t *     p_data;
 404     size_t              i_packet_size;
 405     int                 i_packet, i_error;
 406     thread_ps_data_t *  p_method;
 407
 408     p_method = (thread_ps_data_t *)p_input->p_plugin_data;
 409
 410     memset( pp_packets, 0, INPUT_READ_ONCE * sizeof(data_packet_t *) );
 411     for( i_packet = 0; i_packet < INPUT_READ_ONCE; i_packet++ )
 412     {
 413         /* Read what we believe to be a packet header. */
 414         if( (i_error = SafeRead( p_input, p_header, 6 )) )
 415         {
 416             return( i_error );
 417         }
 418
 419         if( (U32_AT(p_header) & 0xFFFFFF00) != 0x100L )
 420         {
 421             /* This is not the startcode of a packet. Read the stream
 422              * until we find one. */
 423             u32         i_startcode = U32_AT(p_header);
 424             int         i_dummy;
 425
 426             if( i_startcode )
 427             {
 428                 /* It is common for MPEG-1 streams to pad with zeros
 429                  * (although it is forbidden by the recommendation), so
 430                  * don't bother everybody in this case. */
 431                 intf_WarnMsg( 1, "Garbage at input (%.8x)", i_startcode );
 432             }
 433
 434             while( (i_startcode & 0xFFFFFF00) != 0x100L )
 435             {
 436                 i_startcode <<= 8;
 437                 if( (i_dummy = getc( p_method->stream )) != EOF )
 438                 {
 439                     i_startcode |= i_dummy;
 440                 }
 441                 else
 442                 {
 443                     return( 1 );
 444                 }
 445             }
 446             /* Packet found. */
 447             *(u32 *)p_header = U32_AT(&i_startcode);
 448             if( (i_error = SafeRead( p_input, p_header + 4, 2 )) )
 449             {
 450                 return( i_error );
 451             }
 452         }
 453
 454         if( U32_AT(p_header) != 0x1BA )
 455         {
 456             /* That's the case for all packets, except pack header. */
 457             i_packet_size = U16_AT(&p_header[4]);
 458         }
 459         else
 460         {
 461             /* Pack header. */
 462             if( (p_header[4] & 0xC0) == 0x40 )
 463             {
 464                 /* MPEG-2 */
 465                 i_packet_size = 8;
 466             }
 467             else if( (p_header[4] & 0xF0) == 0x20 )
 468             {
 469                 /* MPEG-1 */
 470                 i_packet_size = 6;
 471             }
 472             else
 473             {
 474                 intf_ErrMsg( "Unable to determine stream type" );
 475                 return( -1 );
 476             }
 477         }
 478
 479         /* Fetch a packet of the appropriate size. */
 480         if( (p_data = NewPacket( p_input->p_method_data, i_packet_size + 6 ))
 481             == NULL )
 482         {
 483             intf_ErrMsg( "Out of memory" );
 484             return( -1 );
 485         }
 486
 487         /* Copy the header we already read. */
 488         memcpy( p_data->p_buffer, p_header, 6 );
 489
 490         /* Read the remaining of the packet. */
 491         if( i_packet_size && (i_error =
 492                 SafeRead( p_input, p_data->p_buffer + 6, i_packet_size )) )
 493         {
 494             return( i_error );
 495         }
 496
 497         /* In MPEG-2 pack headers we still have to read stuffing bytes. */
 498         if( U32_AT(p_header) == 0x1BA )
 499         {
 500             if( i_packet_size == 8 && (p_data->p_buffer[13] & 0x7) != 0 )
 501             {
 502                 /* MPEG-2 stuffing bytes */
 503                 byte_t      p_garbage[8];
 504                 if( (i_error = SafeRead( p_input, p_garbage,
 505                                          p_data->p_buffer[13] & 0x7)) )
 506                 {
 507                     return( i_error );
 508                 }
 509             }
 510         }
 511
 512         /* Give the packet to the other input stages. */
 513         pp_packets[i_packet] = p_data;
 514     }
 515
 516     return( 0 );
 517 }
 518
 519 /*****************************************************************************
 520  * PSSeek: changes the stream position indicator
 521  *****************************************************************************/
 522 static void PSSeek( input_thread_t * p_input, off_t i_position )
 523 {
 524     thread_ps_data_t *  p_method;
 525
 526     p_method = (thread_ps_data_t *)p_input->p_plugin_data;
 527
 528     /* A little bourrin but should work for a while --Meuuh */
 529     fseeko( p_method->stream, i_position, SEEK_SET );
 530
 531     p_input->stream.p_selected_area->i_tell = i_position;
 532 }
 533
 534 /*
 535  * Packet management utilities
 536  */
 537
 538
 539 /*****************************************************************************
 540  * NewPacket: allocates a data packet
 541  *****************************************************************************/
 542 static struct data_packet_s * NewPacket( void * p_packet_cache,
 543                                          size_t l_size )
 544 {
 545     packet_cache_t *   p_cache;
 546     data_packet_t *    p_data;
 547     long               l_index;
 548
 549     if ( (p_cache = (packet_cache_t *)p_packet_cache) == NULL )
 550     {
 551         intf_ErrMsg( "PPacket cache not initialized" );
 552         return NULL;
 553     }
 554     /* Safety check */
 555     if( l_size > INPUT_MAX_PACKET_SIZE )
 556     {
 557         intf_ErrMsg( "Packet too big (%d)", l_size );
 558         return NULL;
 559     }
 560
 561     /* Checks whether the data cache is empty */
 562     if( p_cache->data.l_index == 0 )
 563     {
 564         /* Allocates a new packet */
 565         if ( (p_data = malloc( sizeof(data_packet_t) )) == NULL )
 566         {
 567             intf_DbgMsg( "Out of memory" );
 568             return NULL;
 569         }
 570         intf_WarnMsg( 1, "PS input: data packet allocated" );
 571     }
 572     else
 573     {
 574         /* Takes the packet out from the cache */
 575         if( (p_data = p_cache->data.p_stack[ -- p_cache->data.l_index ])
 576             == NULL )
 577         {
 578             intf_DbgMsg( "NULL packet in the data cache" );
 579             return NULL;
 580         }
 581     }
 582
 583     if( l_size < MAX_SMALL_SIZE )
 584     {
 585         /* Small buffer */
 586
 587         /* Checks whether the buffer cache is empty */
 588         if( p_cache->small.l_index == 0 )
 589         {
 590             /* Allocates a new packet */
 591             if ( (p_data->p_buffer = malloc( l_size )) == NULL )
 592             {
 593                 intf_DbgMsg( "Out of memory" );
 594                 free( p_data );
 595                 return NULL;
 596             }
 597             intf_WarnMsg( 1, "PS input: small buffer allocated" );
 598             p_data->l_size = l_size;
 599         }
 600         else
 601         {
 602             /* Takes the packet out from the cache */
 603             l_index = -- p_cache->small.l_index;
 604             if( (p_data->p_buffer = p_cache->small.p_stack[l_index].p_data)
 605                 == NULL )
 606             {
 607                 intf_DbgMsg( "NULL packet in the small buffer cache" );
 608                 free( p_data );
 609                 return NULL;
 610             }
 611                 /* Reallocates the packet if it is too small or too large */
 612             if( p_cache->small.p_stack[l_index].l_size < l_size ||
 613                 p_cache->small.p_stack[l_index].l_size > 2*l_size )
 614             {
 615                 p_data->p_buffer = realloc( p_data->p_buffer, l_size );
 616                 p_data->l_size = l_size;
 617             }
 618             else
 619             {
 620                 p_data->l_size = p_cache->small.p_stack[l_index].l_size;
 621             }
 622         }
 623     }
 624     else
 625     {
 626         /* Large buffer */
 627
 628         /* Checks whether the buffer cache is empty */
 629         if( p_cache->large.l_index == 0 )
 630         {
 631             /* Allocates a new packet */
 632             if ( (p_data->p_buffer = malloc( l_size )) == NULL )
 633             {
 634                 intf_DbgMsg( "Out of memory" );
 635                 free( p_data );
 636                 return NULL;
 637             }
 638             intf_WarnMsg( 1, "PS input: large buffer allocated" );
 639             p_data->l_size = l_size;
 640         }
 641         else
 642         {
 643             /* Takes the packet out from the cache */
 644             l_index = -- p_cache->large.l_index;
 645             if( (p_data->p_buffer = p_cache->large.p_stack[l_index].p_data)
 646                 == NULL )
 647             {
 648                 intf_DbgMsg( "NULL packet in the small buffer cache" );
 649                 free( p_data );
 650                 return NULL;
 651             }
 652                 /* Reallocates the packet if it is too small or too large */
 653             if( p_cache->large.p_stack[l_index].l_size < l_size ||
 654                 p_cache->large.p_stack[l_index].l_size > 2*l_size )
 655             {
 656                 p_data->p_buffer = realloc( p_data->p_buffer, l_size );
 657                 p_data->l_size = l_size;
 658             }
 659             else
 660             {
 661                 p_data->l_size = p_cache->large.p_stack[l_index].l_size;
 662             }
 663             }
 664     }
 665
 666     /* Initialize data */
 667     p_data->p_next = NULL;
 668     p_data->b_discard_payload = 0;
 669     p_data->p_payload_start = p_data->p_buffer;
 670     p_data->p_payload_end = p_data->p_buffer + l_size;
 671
 672     return( p_data );
 673
 674 }
 675
 676
 677 /*****************************************************************************
 678  * NewPES: allocates a pes packet
 679  *****************************************************************************/
 680 static pes_packet_t * NewPES( void * p_packet_cache )
 681 {
 682     packet_cache_t *   p_cache;
 683     pes_packet_t *     p_pes;
 684
 685     if ( (p_cache = (packet_cache_t *)p_packet_cache) == NULL )
 686     {
 687         intf_ErrMsg( "Packet cache not initialized" );
 688         return NULL;
 689     }
 690     /* Checks whether the PES cache is empty */
 691     if( p_cache->pes.l_index == 0 )
 692     {
 693         /* Allocates a new packet */
 694         if ( (p_pes = malloc( sizeof(pes_packet_t) )) == NULL )
 695         {
 696             intf_DbgMsg( "Out of memory" );
 697             return NULL;
 698         }
 699         intf_WarnMsg( 1, "PS input: PES packet allocated" );
 700     }
 701     else
 702     {
 703         /* Takes the packet out from the cache */
 704         if( (p_pes = p_cache->pes.p_stack[ -- p_cache->pes.l_index ])
 705             == NULL )
 706         {
 707             intf_DbgMsg( "NULL packet in the data cache" );
 708             return NULL;
 709         }
 710     }
 711
 712     p_pes->b_data_alignment = p_pes->b_discontinuity =
 713         p_pes->i_pts = p_pes->i_dts = 0;
 714     p_pes->i_pes_size = 0;
 715     p_pes->p_first = NULL;
 716
 717     return( p_pes );
 718
 719 }
 720
 721 /*****************************************************************************
 722  * DeletePacket: deletes a data packet
 723  *****************************************************************************/
 724 static void DeletePacket( void * p_packet_cache,
 725                           data_packet_t * p_data )
 726 {
 727     packet_cache_t *   p_cache;
 728
 729     if ( (p_cache = (packet_cache_t *)p_packet_cache) == NULL )
 730     {
 731         intf_ErrMsg( "Packet cache not initialized" );
 732         return;
 733     }
 734
 735         ASSERT( p_data );
 736
 737     /* Checks whether the data cache is full */
 738     if ( p_cache->data.l_index < DATA_CACHE_SIZE )
 739     {
 740         /* Cache not full: store the packet in it */
 741         p_cache->data.p_stack[ p_cache->data.l_index ++ ] = p_data;
 742         /* Small buffer or large buffer? */
 743         if ( p_data->l_size < MAX_SMALL_SIZE )
 744         {
 745             /* Checks whether the small buffer cache is full */
 746             if ( p_cache->small.l_index < SMALL_CACHE_SIZE )
 747             {
 748                 p_cache->small.p_stack[ p_cache->small.l_index ].l_size =
 749                     p_data->l_size;
 750                 p_cache->small.p_stack[ p_cache->small.l_index ++ ].p_data =
 751                     p_data->p_buffer;
 752             }
 753             else
 754             {
 755                 ASSERT( p_data->p_buffer );
 756                 free( p_data->p_buffer );
 757                 intf_WarnMsg( 1, "PS input: small buffer freed" );
 758             }
 759         }
 760         else
 761         {
 762             /* Checks whether the large buffer cache is full */
 763             if ( p_cache->large.l_index < LARGE_CACHE_SIZE )
 764             {
 765                 p_cache->large.p_stack[ p_cache->large.l_index ].l_size =
 766                     p_data->l_size;
 767                 p_cache->large.p_stack[ p_cache->large.l_index ++ ].p_data =
 768                     p_data->p_buffer;
 769             }
 770             else
 771             {
 772                 ASSERT( p_data->p_buffer );
 773                 free( p_data->p_buffer );
 774                 intf_WarnMsg( 1, "PS input: large buffer freed" );
 775             }
 776         }
 777     }
 778     else
 779     {
 780         /* Cache full: the packet must be freed */
 781         free( p_data->p_buffer );
 782         free( p_data );
 783         intf_WarnMsg( 1, "PS input: data packet freed" );
 784     }
 785
 786 }
 787
 788 /*****************************************************************************
 789  * DeletePES: deletes a PES packet and associated data packets
 790  *****************************************************************************/
 791 static void DeletePES( void * p_packet_cache, pes_packet_t * p_pes )
 792 {
 793     packet_cache_t *    p_cache;
 794     data_packet_t *     p_data;
 795     data_packet_t *     p_next;
 796
 797     if ( (p_cache = (packet_cache_t *)p_packet_cache) == NULL )
 798     {
 799         intf_ErrMsg( "Packet cache not initialized" );
 800         return;
 801     }
 802
 803     ASSERT( p_pes);
 804
 805     p_data = p_pes->p_first;
 806
 807     while( p_data != NULL )
 808     {
 809         p_next = p_data->p_next;
 810         DeletePacket( p_cache, p_data );
 811         p_data = p_next;
 812     }
 813
 814     /* Checks whether the PES cache is full */
 815     if ( p_cache->pes.l_index < PES_CACHE_SIZE )
 816     {
 817         /* Cache not full: store the packet in it */
 818         p_cache->pes.p_stack[ p_cache->pes.l_index ++ ] = p_pes;
 819     }
 820     else
 821     {
 822         /* Cache full: the packet must be freed */
 823         free( p_pes );
 824         intf_WarnMsg( 1, "PS input: PES packet freed" );
 825     }
 826 }
 827