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 1.23 2001/05/08 00:43:57 sam 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 #ifdef STRNCASECMP_IN_STRINGS_H
  36 #   include <strings.h>
  37 #endif
  38 #include <errno.h>
  39
  40 #include <sys/types.h>
  41 #include <sys/stat.h>
  42 #include <unistd.h>
  43 #include <fcntl.h>
  44
  45 #include "config.h"
  46 #include "common.h"
  47 #include "threads.h"
  48 #include "mtime.h"
  49 #include "tests.h"
  50
  51 #include "intf_msg.h"
  52
  53 #include "main.h"
  54
  55 #include "stream_control.h"
  56 #include "input_ext-intf.h"
  57 #include "input_ext-dec.h"
  58
  59 #include "input.h"
  60
  61 #include "input_ps.h"
  62 #include "mpeg_system.h"
  63
  64 #include "debug.h"
  65
  66 #include "modules.h"
  67
  68 /*****************************************************************************
  69  * Local prototypes
  70  *****************************************************************************/
  71 static int  PSProbe     ( probedata_t * );
  72 static int  PSRead      ( struct input_thread_s *,
  73                           data_packet_t * p_packets[INPUT_READ_ONCE] );
  74 static void PSInit      ( struct input_thread_s * );
  75 static void PSEnd       ( struct input_thread_s * );
  76 static void PSSeek      ( struct input_thread_s *, off_t );
  77 static struct pes_packet_s *  NewPES    ( void * );
  78 static struct data_packet_s * NewPacket ( void *, size_t );
  79 static void DeletePacket( void *, struct data_packet_s * );
  80 static void DeletePES   ( void *, struct pes_packet_s * );
  81
  82 /*****************************************************************************
  83  * Functions exported as capabilities. They are declared as static so that
  84  * we don't pollute the namespace too much.
  85  *****************************************************************************/
  86 void _M( input_getfunctions )( function_list_t * p_function_list )
  87 {
  88 #define input p_function_list->functions.input
  89     p_function_list->pf_probe = PSProbe;
  90     input.pf_init             = PSInit;
  91     input.pf_open             = input_FileOpen;
  92     input.pf_close            = input_FileClose;
  93     input.pf_end              = PSEnd;
  94     input.pf_set_area         = NULL;
  95     input.pf_read             = PSRead;
  96     input.pf_demux            = input_DemuxPS;
  97     input.pf_new_packet       = NewPacket;
  98     input.pf_new_pes          = NewPES;
  99     input.pf_delete_packet    = DeletePacket;
 100     input.pf_delete_pes       = DeletePES;
 101     input.pf_rewind           = NULL;
 102     input.pf_seek             = PSSeek;
 103 #undef input
 104 }
 105
 106 /*
 107  * Data reading functions
 108  */
 109
 110 /*****************************************************************************
 111  * PSProbe: verifies that the stream is a PS stream
 112  *****************************************************************************/
 113 static int PSProbe( probedata_t *p_data )
 114 {
 115     input_thread_t * p_input = (input_thread_t *)p_data;
 116
 117     char * psz_name = p_input->p_source;
 118     int i_handle;
 119     int i_score = 10;
 120
 121     if( TestMethod( INPUT_METHOD_VAR, "ps" ) )
 122     {
 123         return( 999 );
 124     }
 125
 126     if( ( strlen(psz_name) > 5 ) && !strncasecmp( psz_name, "file:", 5 ) )
 127     {
 128         /* If the user specified "file:" then it's probably a file */
 129         i_score = 100;
 130         psz_name += 5;
 131     }
 132
 133     i_handle = open( psz_name, 0 );
 134     if( i_handle == -1 )
 135     {
 136         return( 0 );
 137     }
 138     close( i_handle );
 139
 140     return( i_score );
 141 }
 142
 143 /*****************************************************************************
 144  * PSInit: initializes PS structures
 145  *****************************************************************************/
 146 static void PSInit( input_thread_t * p_input )
 147 {
 148     thread_ps_data_t *  p_method;
 149     packet_cache_t *    p_packet_cache;
 150
 151     if( (p_method =
 152          (thread_ps_data_t *)malloc( sizeof(thread_ps_data_t) )) == NULL )
 153     {
 154         intf_ErrMsg( "Out of memory" );
 155         p_input->b_error = 1;
 156         return;
 157     }
 158     p_input->p_plugin_data = (void *)p_method;
 159
 160     /* creates the packet cache structure */
 161     p_packet_cache = malloc( sizeof(packet_cache_t) );
 162     if ( p_packet_cache == NULL )
 163     {
 164         intf_ErrMsg( "Out of memory" );
 165         p_input->b_error = 1;
 166         return;
 167     }
 168     p_input->p_method_data = (void *)p_packet_cache;
 169
 170     /* Initialize packet cache mutex */
 171     vlc_mutex_init( &p_packet_cache->lock );
 172
 173     /* allocates the data cache */
 174     p_packet_cache->data.p_stack = malloc( DATA_CACHE_SIZE *
 175         sizeof(data_packet_t*) );
 176     if ( p_packet_cache->data.p_stack == NULL )
 177     {
 178         intf_ErrMsg( "Out of memory" );
 179         p_input->b_error = 1;
 180         return;
 181     }
 182     p_packet_cache->data.l_index = 0;
 183
 184     /* allocates the PES cache */
 185     p_packet_cache->pes.p_stack = malloc( PES_CACHE_SIZE *
 186         sizeof(pes_packet_t*) );
 187     if ( p_packet_cache->pes.p_stack == NULL )
 188     {
 189         intf_ErrMsg( "Out of memory" );
 190         p_input->b_error = 1;
 191         return;
 192     }
 193     p_packet_cache->pes.l_index = 0;
 194
 195     /* allocates the small buffer cache */
 196     p_packet_cache->small.p_stack = malloc( SMALL_CACHE_SIZE *
 197         sizeof(packet_buffer_t) );
 198     if ( p_packet_cache->small.p_stack == NULL )
 199     {
 200         intf_ErrMsg( "Out of memory" );
 201         p_input->b_error = 1;
 202         return;
 203     }
 204     p_packet_cache->small.l_index = 0;
 205
 206     /* allocates the large buffer cache */
 207     p_packet_cache->large.p_stack = malloc( LARGE_CACHE_SIZE *
 208         sizeof(packet_buffer_t) );
 209     if ( p_packet_cache->large.p_stack == NULL )
 210     {
 211         intf_ErrMsg( "Out of memory" );
 212         p_input->b_error = 1;
 213         return;
 214     }
 215     p_packet_cache->large.l_index = 0;
 216
 217     /* Re-open the socket as a buffered FILE stream */
 218     if( (p_method->stream = fdopen( p_input->i_handle, "r" )) == NULL )
 219     {
 220         intf_ErrMsg( "Cannot open file (%s)", strerror(errno) );
 221         p_input->b_error = 1;
 222         return;
 223     }
 224     rewind( p_method->stream );
 225
 226     /* FIXME : detect if InitStream failed */
 227     input_InitStream( p_input, sizeof( stream_ps_data_t ) );
 228     input_AddProgram( p_input, 0, sizeof( stream_ps_data_t ) );
 229
 230     if( p_input->stream.b_seekable )
 231     {
 232         stream_ps_data_t * p_demux_data =
 233              (stream_ps_data_t *)p_input->stream.pp_programs[0]->p_demux_data;
 234
 235         /* Pre-parse the stream to gather stream_descriptor_t. */
 236         p_input->stream.pp_programs[0]->b_is_ok = 0;
 237         p_demux_data->i_PSM_version = EMPTY_PSM_VERSION;
 238
 239         while( !p_input->b_die && !p_input->b_error
 240                 && !p_demux_data->b_has_PSM )
 241         {
 242             int                 i_result, i;
 243             data_packet_t *     pp_packets[INPUT_READ_ONCE];
 244
 245             i_result = PSRead( p_input, pp_packets );
 246             if( i_result == 1 )
 247             {
 248                 /* EOF */
 249                 vlc_mutex_lock( &p_input->stream.stream_lock );
 250                 p_input->stream.pp_programs[0]->b_is_ok = 1;
 251                 vlc_mutex_unlock( &p_input->stream.stream_lock );
 252                 break;
 253             }
 254             if( i_result == -1 )
 255             {
 256                 p_input->b_error = 1;
 257                 break;
 258             }
 259
 260             for( i = 0; i < INPUT_READ_ONCE && pp_packets[i] != NULL; i++ )
 261             {
 262                 /* FIXME: use i_p_config_t */
 263                 input_ParsePS( p_input, pp_packets[i] );
 264                 DeletePacket( p_input->p_method_data, pp_packets[i] );
 265             }
 266
 267             /* File too big. */
 268             if( p_input->stream.p_selected_area->i_tell >
 269                                                     INPUT_PREPARSE_LENGTH )
 270             {
 271                 break;
 272             }
 273         }
 274         rewind( p_method->stream );
 275         vlc_mutex_lock( &p_input->stream.stream_lock );
 276
 277         p_input->stream.i_method = INPUT_METHOD_FILE;
 278         p_input->stream.p_selected_area->i_tell = 0;
 279
 280         if( p_demux_data->b_has_PSM )
 281         {
 282             /* (The PSM decoder will care about spawning the decoders) */
 283             p_input->stream.pp_programs[0]->b_is_ok = 1;
 284         }
 285 #ifdef AUTO_SPAWN
 286         else
 287         {
 288             /* (We have to do it ourselves) */
 289             int                 i_es;
 290
 291             /* FIXME: we should do multiple passes in case an audio type
 292              * is not present */
 293             for( i_es = 0;
 294                  i_es < p_input->stream.pp_programs[0]->i_es_number;
 295                  i_es++ )
 296             {
 297 #define p_es p_input->stream.pp_programs[0]->pp_es[i_es]
 298                 switch( p_es->i_type )
 299                 {
 300                     case MPEG1_VIDEO_ES:
 301                     case MPEG2_VIDEO_ES:
 302                         input_SelectES( p_input, p_es );
 303                         break;
 304
 305                     case MPEG1_AUDIO_ES:
 306                     case MPEG2_AUDIO_ES:
 307                         if( main_GetIntVariable( INPUT_CHANNEL_VAR, 0 )
 308                                 == (p_es->i_id & 0x1F) )
 309                         switch( main_GetIntVariable( INPUT_AUDIO_VAR, 0 ) )
 310                         {
 311                         case 0:
 312                             main_PutIntVariable( INPUT_AUDIO_VAR,
 313                                                  REQUESTED_MPEG );
 314                         case REQUESTED_MPEG:
 315                             input_SelectES( p_input, p_es );
 316                         }
 317                         break;
 318
 319                     case AC3_AUDIO_ES:
 320                         if( main_GetIntVariable( INPUT_CHANNEL_VAR, 0 )
 321                                 == ((p_es->i_id & 0xF00) >> 8) )
 322                         switch( main_GetIntVariable( INPUT_AUDIO_VAR, 0 ) )
 323                         {
 324                         case 0:
 325                             main_PutIntVariable( INPUT_AUDIO_VAR,
 326                                                  REQUESTED_AC3 );
 327                         case REQUESTED_AC3:
 328                             input_SelectES( p_input, p_es );
 329                         }
 330                         break;
 331
 332                     case DVD_SPU_ES:
 333                         if( main_GetIntVariable( INPUT_SUBTITLE_VAR, -1 )
 334                                 == ((p_es->i_id & 0x1F00) >> 8) )
 335                         {
 336                             input_SelectES( p_input, p_es );
 337                         }
 338                         break;
 339
 340                     case LPCM_AUDIO_ES:
 341                         /* FIXME ! */
 342                         break;
 343                 }
 344             }
 345
 346         }
 347 #endif
 348 #ifdef STATS
 349         input_DumpStream( p_input );
 350 #endif
 351         vlc_mutex_unlock( &p_input->stream.stream_lock );
 352     }
 353     else
 354     {
 355         /* The programs will be added when we read them. */
 356         vlc_mutex_lock( &p_input->stream.stream_lock );
 357         p_input->stream.i_method = INPUT_METHOD_FILE;
 358         p_input->stream.pp_programs[0]->b_is_ok = 0;
 359         vlc_mutex_unlock( &p_input->stream.stream_lock );
 360     }
 361 }
 362
 363 /*****************************************************************************
 364  * PSEnd: frees unused data
 365  *****************************************************************************/
 366 static void PSEnd( input_thread_t * p_input )
 367 {
 368     vlc_mutex_destroy( &((packet_cache_t *)p_input->p_plugin_data)->lock );
 369     free( p_input->p_plugin_data );
 370 }
 371
 372 /*****************************************************************************
 373  * SafeRead: reads a chunk of stream and correctly detects errors
 374  *****************************************************************************/
 375 static __inline__ int SafeRead( input_thread_t * p_input, byte_t * p_buffer,
 376                                 size_t i_len )
 377 {
 378     thread_ps_data_t *  p_method;
 379     int                 i_error;
 380
 381     p_method = (thread_ps_data_t *)p_input->p_plugin_data;
 382     while( fread( p_buffer, i_len, 1, p_method->stream ) != 1 )
 383     {
 384         if( feof( p_method->stream ) )
 385         {
 386             return( 1 );
 387         }
 388
 389         if( (i_error = ferror( p_method->stream )) )
 390         {
 391             intf_ErrMsg( "Read failed (%s)", strerror(i_error) );
 392             return( -1 );
 393         }
 394     }
 395     vlc_mutex_lock( &p_input->stream.stream_lock );
 396     p_input->stream.p_selected_area->i_tell += i_len;
 397     vlc_mutex_unlock( &p_input->stream.stream_lock );
 398     return( 0 );
 399 }
 400
 401 /*****************************************************************************
 402  * PSRead: reads data packets
 403  *****************************************************************************
 404  * Returns -1 in case of error, 0 if everything went well, and 1 in case of
 405  * EOF.
 406  *****************************************************************************/
 407 static int PSRead( input_thread_t * p_input,
 408                    data_packet_t * pp_packets[INPUT_READ_ONCE] )
 409 {
 410     byte_t              p_header[6];
 411     data_packet_t *     p_data;
 412     size_t              i_packet_size;
 413     int                 i_packet, i_error;
 414     thread_ps_data_t *  p_method;
 415
 416     p_method = (thread_ps_data_t *)p_input->p_plugin_data;
 417
 418     memset( pp_packets, 0, INPUT_READ_ONCE * sizeof(data_packet_t *) );
 419     for( i_packet = 0; i_packet < INPUT_READ_ONCE; i_packet++ )
 420     {
 421         /* Read what we believe to be a packet header. */
 422         if( (i_error = SafeRead( p_input, p_header, 6 )) )
 423         {
 424             return( i_error );
 425         }
 426
 427         if( (U32_AT(p_header) & 0xFFFFFF00) != 0x100L )
 428         {
 429             /* This is not the startcode of a packet. Read the stream
 430              * until we find one. */
 431             u32         i_startcode = U32_AT(p_header);
 432             int         i_dummy;
 433
 434             if( i_startcode )
 435             {
 436                 /* It is common for MPEG-1 streams to pad with zeros
 437                  * (although it is forbidden by the recommendation), so
 438                  * don't bother everybody in this case. */
 439                 intf_WarnMsg( 3, "Garbage at input (%.8x)", i_startcode );
 440             }
 441
 442             while( (i_startcode & 0xFFFFFF00) != 0x100L )
 443             {
 444                 i_startcode <<= 8;
 445                 if( (i_dummy = getc( p_method->stream )) != EOF )
 446                 {
 447                     i_startcode |= i_dummy;
 448                 }
 449                 else
 450                 {
 451                     return( 1 );
 452                 }
 453             }
 454             /* Packet found. */
 455             *(u32 *)p_header = U32_AT(&i_startcode);
 456             if( (i_error = SafeRead( p_input, p_header + 4, 2 )) )
 457             {
 458                 return( i_error );
 459             }
 460         }
 461
 462         if( U32_AT(p_header) != 0x1BA )
 463         {
 464             /* That's the case for all packets, except pack header. */
 465             i_packet_size = U16_AT(&p_header[4]);
 466         }
 467         else
 468         {
 469             /* Pack header. */
 470             if( (p_header[4] & 0xC0) == 0x40 )
 471             {
 472                 /* MPEG-2 */
 473                 i_packet_size = 8;
 474             }
 475             else if( (p_header[4] & 0xF0) == 0x20 )
 476             {
 477                 /* MPEG-1 */
 478                 i_packet_size = 6;
 479             }
 480             else
 481             {
 482                 intf_ErrMsg( "Unable to determine stream type" );
 483                 return( -1 );
 484             }
 485         }
 486
 487         /* Fetch a packet of the appropriate size. */
 488         if( (p_data = NewPacket( p_input->p_method_data, i_packet_size + 6 ))
 489             == NULL )
 490         {
 491             intf_ErrMsg( "Out of memory" );
 492             return( -1 );
 493         }
 494
 495         /* Copy the header we already read. */
 496         memcpy( p_data->p_buffer, p_header, 6 );
 497
 498         /* Read the remaining of the packet. */
 499         if( i_packet_size && (i_error =
 500                 SafeRead( p_input, p_data->p_buffer + 6, i_packet_size )) )
 501         {
 502             return( i_error );
 503         }
 504
 505         /* In MPEG-2 pack headers we still have to read stuffing bytes. */
 506         if( U32_AT(p_header) == 0x1BA )
 507         {
 508             if( i_packet_size == 8 && (p_data->p_buffer[13] & 0x7) != 0 )
 509             {
 510                 /* MPEG-2 stuffing bytes */
 511                 byte_t      p_garbage[8];
 512                 if( (i_error = SafeRead( p_input, p_garbage,
 513                                          p_data->p_buffer[13] & 0x7)) )
 514                 {
 515                     return( i_error );
 516                 }
 517             }
 518         }
 519
 520         /* Give the packet to the other input stages. */
 521         pp_packets[i_packet] = p_data;
 522     }
 523
 524     return( 0 );
 525 }
 526
 527 /*****************************************************************************
 528  * PSSeek: changes the stream position indicator
 529  *****************************************************************************/
 530 static void PSSeek( input_thread_t * p_input, off_t i_position )
 531 {
 532     thread_ps_data_t *  p_method;
 533
 534     p_method = (thread_ps_data_t *)p_input->p_plugin_data;
 535
 536     /* A little bourrin but should work for a while --Meuuh */
 537 #ifndef WIN32
 538     fseeko( p_method->stream, i_position, SEEK_SET );
 539 #else
 540     fseek( p_method->stream, (long)i_position, SEEK_SET );
 541 #endif
 542
 543     p_input->stream.p_selected_area->i_tell = i_position;
 544 }
 545
 546 /*
 547  * Packet management utilities
 548  */
 549
 550
 551 /*****************************************************************************
 552  * NewPacket: allocates a data packet
 553  *****************************************************************************/
 554 static struct data_packet_s * NewPacket( void * p_packet_cache,
 555                                          size_t l_size )
 556 {
 557     packet_cache_t *   p_cache;
 558     data_packet_t *    p_data;
 559     long               l_index;
 560
 561     p_cache = (packet_cache_t *)p_packet_cache;
 562
 563 #ifdef DEBUG
 564     if ( p_cache == NULL )
 565     {
 566         intf_ErrMsg( "PPacket cache not initialized" );
 567         return NULL;
 568     }
 569 #endif
 570
 571     /* Safety check */
 572     if( l_size > INPUT_MAX_PACKET_SIZE )
 573     {
 574         intf_ErrMsg( "Packet too big (%d)", l_size );
 575         return NULL;
 576     }
 577
 578     vlc_mutex_lock( &p_cache->lock );
 579
 580     /* Checks whether the data cache is empty */
 581     if( p_cache->data.l_index == 0 )
 582     {
 583         /* Allocates a new packet */
 584         if ( (p_data = malloc( sizeof(data_packet_t) )) == NULL )
 585         {
 586             intf_ErrMsg( "Out of memory" );
 587             vlc_mutex_unlock( &p_cache->lock );
 588             return NULL;
 589         }
 590 #ifdef TRACE_INPUT
 591         intf_DbgMsg( "PS input: data packet allocated" );
 592 #endif
 593     }
 594     else
 595     {
 596         /* Takes the packet out from the cache */
 597         if( (p_data = p_cache->data.p_stack[ -- p_cache->data.l_index ])
 598             == NULL )
 599         {
 600             intf_ErrMsg( "NULL packet in the data cache" );
 601             vlc_mutex_unlock( &p_cache->lock );
 602             return NULL;
 603         }
 604     }
 605
 606     if( l_size < MAX_SMALL_SIZE )
 607     {
 608         /* Small buffer */
 609
 610         /* Checks whether the buffer cache is empty */
 611         if( p_cache->small.l_index == 0 )
 612         {
 613             /* Allocates a new packet */
 614             if ( (p_data->p_buffer = malloc( l_size )) == NULL )
 615             {
 616                 intf_DbgMsg( "Out of memory" );
 617                 free( p_data );
 618                 vlc_mutex_unlock( &p_cache->lock );
 619                 return NULL;
 620             }
 621 #ifdef TRACE_INPUT
 622             intf_DbgMsg( "PS input: small buffer allocated" );
 623 #endif
 624             p_data->l_size = l_size;
 625         }
 626         else
 627         {
 628             /* Takes the packet out from the cache */
 629             l_index = -- p_cache->small.l_index;
 630             if( (p_data->p_buffer = p_cache->small.p_stack[l_index].p_data)
 631                 == NULL )
 632             {
 633                 intf_ErrMsg( "NULL packet in the small buffer cache" );
 634                 free( p_data );
 635                 vlc_mutex_unlock( &p_cache->lock );
 636                 return NULL;
 637             }
 638             /* Reallocates the packet if it is too small or too large */
 639             if( p_cache->small.p_stack[l_index].l_size < l_size ||
 640                 p_cache->small.p_stack[l_index].l_size > 2*l_size )
 641             {
 642                 p_data->p_buffer = realloc( p_data->p_buffer, l_size );
 643                 p_data->l_size = l_size;
 644             }
 645             else
 646             {
 647                 p_data->l_size = p_cache->small.p_stack[l_index].l_size;
 648             }
 649         }
 650     }
 651     else
 652     {
 653         /* Large buffer */
 654
 655         /* Checks whether the buffer cache is empty */
 656         if( p_cache->large.l_index == 0 )
 657         {
 658             /* Allocates a new packet */
 659             if ( (p_data->p_buffer = malloc( l_size )) == NULL )
 660             {
 661                 intf_ErrMsg( "Out of memory" );
 662                 free( p_data );
 663                 vlc_mutex_unlock( &p_cache->lock );
 664                 return NULL;
 665             }
 666 #ifdef TRACE_INPUT
 667             intf_DbgMsg( "PS input: large buffer allocated" );
 668 #endif
 669             p_data->l_size = l_size;
 670         }
 671         else
 672         {
 673             /* Takes the packet out from the cache */
 674             l_index = -- p_cache->large.l_index;
 675             if( (p_data->p_buffer = p_cache->large.p_stack[l_index].p_data)
 676                 == NULL )
 677             {
 678                 intf_ErrMsg( "NULL packet in the small buffer cache" );
 679                 free( p_data );
 680                 vlc_mutex_unlock( &p_cache->lock );
 681                 return NULL;
 682             }
 683             /* Reallocates the packet if it is too small or too large */
 684             if( p_cache->large.p_stack[l_index].l_size < l_size ||
 685                 p_cache->large.p_stack[l_index].l_size > 2*l_size )
 686             {
 687                 p_data->p_buffer = realloc( p_data->p_buffer, l_size );
 688                 p_data->l_size = l_size;
 689             }
 690             else
 691             {
 692                 p_data->l_size = p_cache->large.p_stack[l_index].l_size;
 693             }
 694         }
 695     }
 696
 697     vlc_mutex_unlock( &p_cache->lock );
 698
 699     /* Initialize data */
 700     p_data->p_next = NULL;
 701     p_data->b_discard_payload = 0;
 702     p_data->p_payload_start = p_data->p_buffer;
 703     p_data->p_payload_end = p_data->p_buffer + l_size;
 704
 705     return( p_data );
 706
 707 }
 708
 709
 710 /*****************************************************************************
 711  * NewPES: allocates a pes packet
 712  *****************************************************************************/
 713 static pes_packet_t * NewPES( void * p_packet_cache )
 714 {
 715     packet_cache_t *   p_cache;
 716     pes_packet_t *     p_pes;
 717
 718     p_cache = (packet_cache_t *)p_packet_cache;
 719
 720 #ifdef DEBUG
 721     if ( p_cache == NULL )
 722     {
 723         intf_ErrMsg( "Packet cache not initialized" );
 724         return NULL;
 725     }
 726 #endif
 727
 728     vlc_mutex_lock( &p_cache->lock );
 729
 730     /* Checks whether the PES cache is empty */
 731     if( p_cache->pes.l_index == 0 )
 732     {
 733         /* Allocates a new packet */
 734         if ( (p_pes = malloc( sizeof(pes_packet_t) )) == NULL )
 735         {
 736             intf_DbgMsg( "Out of memory" );
 737             vlc_mutex_unlock( &p_cache->lock );
 738             return NULL;
 739         }
 740 #ifdef TRACE_INPUT
 741         intf_DbgMsg( "PS input: PES packet allocated" );
 742 #endif
 743     }
 744     else
 745     {
 746         /* Takes the packet out from the cache */
 747         if( (p_pes = p_cache->pes.p_stack[ -- p_cache->pes.l_index ])
 748             == NULL )
 749         {
 750             intf_ErrMsg( "NULL packet in the data cache" );
 751             vlc_mutex_unlock( &p_cache->lock );
 752             return NULL;
 753         }
 754     }
 755
 756     vlc_mutex_unlock( &p_cache->lock );
 757
 758     p_pes->b_data_alignment = p_pes->b_discontinuity =
 759         p_pes->i_pts = p_pes->i_dts = 0;
 760     p_pes->i_pes_size = 0;
 761     p_pes->p_first = NULL;
 762
 763     return( p_pes );
 764
 765 }
 766
 767 /*****************************************************************************
 768  * DeletePacket: deletes a data packet
 769  *****************************************************************************/
 770 static void DeletePacket( void * p_packet_cache,
 771                           data_packet_t * p_data )
 772 {
 773     packet_cache_t *   p_cache;
 774
 775     p_cache = (packet_cache_t *)p_packet_cache;
 776
 777 #ifdef DEBUG
 778     if ( p_cache == NULL )
 779     {
 780         intf_ErrMsg( "Packet cache not initialized" );
 781         return;
 782     }
 783 #endif
 784
 785     ASSERT( p_data );
 786
 787     vlc_mutex_lock( &p_cache->lock );
 788
 789     /* Checks whether the data cache is full */
 790     if ( p_cache->data.l_index < DATA_CACHE_SIZE )
 791     {
 792         /* Cache not full: store the packet in it */
 793         p_cache->data.p_stack[ p_cache->data.l_index ++ ] = p_data;
 794         /* Small buffer or large buffer? */
 795         if ( p_data->l_size < MAX_SMALL_SIZE )
 796         {
 797             /* Checks whether the small buffer cache is full */
 798             if ( p_cache->small.l_index < SMALL_CACHE_SIZE )
 799             {
 800                 p_cache->small.p_stack[ p_cache->small.l_index ].l_size =
 801                     p_data->l_size;
 802                 p_cache->small.p_stack[ p_cache->small.l_index ++ ].p_data =
 803                     p_data->p_buffer;
 804             }
 805             else
 806             {
 807                 ASSERT( p_data->p_buffer );
 808                 free( p_data->p_buffer );
 809 #ifdef TRACE_INPUT
 810                 intf_DbgMsg( "PS input: small buffer freed" );
 811 #endif
 812             }
 813         }
 814         else
 815         {
 816             /* Checks whether the large buffer cache is full */
 817             if ( p_cache->large.l_index < LARGE_CACHE_SIZE )
 818             {
 819                 p_cache->large.p_stack[ p_cache->large.l_index ].l_size =
 820                     p_data->l_size;
 821                 p_cache->large.p_stack[ p_cache->large.l_index ++ ].p_data =
 822                     p_data->p_buffer;
 823             }
 824             else
 825             {
 826                 ASSERT( p_data->p_buffer );
 827                 free( p_data->p_buffer );
 828 #ifdef TRACE_INPUT
 829                 intf_DbgMsg( "PS input: large buffer freed" );
 830 #endif
 831             }
 832         }
 833     }
 834     else
 835     {
 836         /* Cache full: the packet must be freed */
 837         free( p_data->p_buffer );
 838         free( p_data );
 839 #ifdef TRACE_INPUT
 840         intf_DbgMsg( "PS input: data packet freed" );
 841 #endif
 842     }
 843
 844     vlc_mutex_unlock( &p_cache->lock );
 845 }
 846
 847 /*****************************************************************************
 848  * DeletePES: deletes a PES packet and associated data packets
 849  *****************************************************************************/
 850 static void DeletePES( void * p_packet_cache, pes_packet_t * p_pes )
 851 {
 852     packet_cache_t *    p_cache;
 853     data_packet_t *     p_data;
 854     data_packet_t *     p_next;
 855
 856     p_cache = (packet_cache_t *)p_packet_cache;
 857
 858 #ifdef DEBUG
 859     if ( p_cache == NULL )
 860     {
 861         intf_ErrMsg( "Packet cache not initialized" );
 862         return;
 863     }
 864 #endif
 865
 866     ASSERT( p_pes);
 867
 868     p_data = p_pes->p_first;
 869
 870     while( p_data != NULL )
 871     {
 872         p_next = p_data->p_next;
 873         DeletePacket( p_cache, p_data );
 874         p_data = p_next;
 875     }
 876
 877     vlc_mutex_lock( &p_cache->lock );
 878
 879     /* Checks whether the PES cache is full */
 880     if ( p_cache->pes.l_index < PES_CACHE_SIZE )
 881     {
 882         /* Cache not full: store the packet in it */
 883         p_cache->pes.p_stack[ p_cache->pes.l_index ++ ] = p_pes;
 884     }
 885     else
 886     {
 887         /* Cache full: the packet must be freed */
 888         free( p_pes );
 889 #ifdef TRACE_INPUT
 890         intf_DbgMsg( "PS input: PES packet freed" );
 891 #endif
 892     }
 893
 894     vlc_mutex_unlock( &p_cache->lock );
 895 }
 896