git.sesse.net Git - vlc/blob - src/input/input.c

   1 /*****************************************************************************
   2  * input.c: input thread
   3  * Read an MPEG2 stream, demultiplex and parse it before sending it to
   4  * decoders.
   5  *****************************************************************************
   6  * Copyright (C) 1998-2001 VideoLAN
   7  * $Id: input.c,v 1.208 2002/07/25 21:53:53 sigmunau Exp $
   8  *
   9  * Authors: Christophe Massiot <massiot@via.ecp.fr>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  24  *****************************************************************************/
  25
  26 /*****************************************************************************
  27  * Preamble
  28  *****************************************************************************/
  29 #include <stdlib.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <fcntl.h>
  33
  34 #include <vlc/vlc.h>
  35
  36 #include <string.h>
  37 #include <errno.h>
  38
  39 #ifdef HAVE_SYS_TIMES_H
  40 #   include <sys/times.h>
  41 #endif
  42
  43 #include "netutils.h"
  44 #include "vlc_playlist.h"
  45
  46 #include "stream_control.h"
  47 #include "input_ext-intf.h"
  48 #include "input_ext-dec.h"
  49 #include "input_ext-plugins.h"
  50
  51 #include "interface.h"
  52
  53 /*****************************************************************************
  54  * Local prototypes
  55  *****************************************************************************/
  56 static  int RunThread       ( input_thread_t *p_input );
  57 static  int InitThread      ( input_thread_t *p_input );
  58 static void ErrorThread     ( input_thread_t *p_input );
  59 static void EndThread       ( input_thread_t *p_input );
  60
  61 /*****************************************************************************
  62  * input_CreateThread: creates a new input thread
  63  *****************************************************************************
  64  * This function creates a new input, and returns a pointer
  65  * to its description. On error, it returns NULL.
  66  * If pi_status is NULL, then the function will block until the thread is ready.
  67  * If not, it will be updated using one of the THREAD_* constants.
  68  *****************************************************************************/
  69 input_thread_t *__input_CreateThread( vlc_object_t *p_parent,
  70                                       playlist_item_t *p_item, int *pi_status )
  71 {
  72     input_thread_t *    p_input;                        /* thread descriptor */
  73     input_info_category_t * p_info;
  74
  75     /* Allocate descriptor */
  76     p_input = vlc_object_create( p_parent, VLC_OBJECT_INPUT );
  77     if( p_input == NULL )
  78     {
  79         msg_Err( p_parent, "out of memory" );
  80         return NULL;
  81     }
  82
  83     /* Initialize thread properties */
  84     p_input->b_eof      = 0;
  85
  86     /* Set target */
  87     p_input->psz_source = strdup( p_item->psz_name );
  88
  89     /* Demux */
  90     p_input->p_demux_module = NULL;
  91     p_input->pf_init    = NULL;
  92     p_input->pf_end     = NULL;
  93     p_input->pf_demux   = NULL;
  94     p_input->pf_rewind  = NULL;
  95
  96     /* Access */
  97     p_input->p_access_module = NULL;
  98     p_input->pf_open        = NULL;
  99     p_input->pf_close       = NULL;
 100     p_input->pf_read        = NULL;
 101     p_input->pf_seek        = NULL;
 102     p_input->pf_set_area    = NULL;
 103     p_input->pf_set_program = NULL;
 104
 105     p_input->i_bufsize = 0;
 106     p_input->i_mtu = 0;
 107
 108     /* Initialize statistics */
 109     p_input->c_loops                    = 0;
 110     p_input->stream.c_packets_read      = 0;
 111     p_input->stream.c_packets_trashed   = 0;
 112
 113     /* Set locks. */
 114     vlc_mutex_init( p_input, &p_input->stream.stream_lock );
 115     vlc_cond_init( p_input, &p_input->stream.stream_wait );
 116     vlc_mutex_init( p_input, &p_input->stream.control.control_lock );
 117
 118     /* Initialize stream description */
 119     p_input->stream.b_changed = 0;
 120     p_input->stream.i_es_number = 0;
 121     p_input->stream.i_selected_es_number = 0;
 122     p_input->stream.i_pgrm_number = 0;
 123     p_input->stream.i_new_status = p_input->stream.i_new_rate = 0;
 124     p_input->stream.b_new_mute = MUTE_NO_CHANGE;
 125     p_input->stream.i_mux_rate = 0;
 126     p_input->stream.b_seekable = 0;
 127
 128     /* no stream, no program, no area, no es */
 129     p_input->stream.p_new_program = NULL;
 130
 131     p_input->stream.i_area_nb = 0;
 132     p_input->stream.pp_areas = NULL;
 133     p_input->stream.p_selected_area = NULL;
 134     p_input->stream.p_new_area = NULL;
 135
 136     p_input->stream.pp_selected_es = NULL;
 137     p_input->stream.p_removed_es = NULL;
 138     p_input->stream.p_newly_selected_es = NULL;
 139
 140     /* By default there is one area in a stream */
 141     input_AddArea( p_input );
 142     p_input->stream.p_selected_area = p_input->stream.pp_areas[0];
 143
 144     /* Initialize stream control properties. */
 145     p_input->stream.control.i_status = PLAYING_S;
 146     p_input->stream.control.i_rate = DEFAULT_RATE;
 147     p_input->stream.control.b_mute = 0;
 148     p_input->stream.control.b_grayscale = config_GetInt( p_input, "grayscale" );
 149     p_input->stream.control.i_smp = config_GetInt( p_input, "vdec-smp" );
 150
 151     /* Initialize input info */
 152     p_input->stream.p_info = malloc( sizeof( input_info_category_t ) );
 153     if( !p_input->stream.p_info )
 154     {
 155         msg_Err( p_input, "No memory!" );
 156         return NULL;
 157     }
 158     p_input->stream.p_info->psz_name = strdup("General") ;
 159     p_input->stream.p_info->p_info = NULL;
 160     p_input->stream.p_info->p_next = NULL;
 161
 162     msg_Info( p_input, "playlist item `%s'", p_input->psz_source );
 163
 164     p_info = input_InfoCategory( p_input, "General");
 165     input_AddInfo( p_info, "Playlist item", p_input->psz_source );
 166     vlc_object_attach( p_input, p_parent );
 167
 168     /* Create thread and wait for its readiness. */
 169     if( vlc_thread_create( p_input, "input", RunThread, VLC_TRUE ) )
 170     {
 171         msg_Err( p_input, "cannot create input thread (%s)", strerror(errno) );
 172         free( p_input );
 173         return NULL;
 174     }
 175
 176     return p_input;
 177 }
 178
 179 /*****************************************************************************
 180  * input_StopThread: mark an input thread as zombie
 181  *****************************************************************************
 182  * This function should not return until the thread is effectively cancelled.
 183  *****************************************************************************/
 184 void input_StopThread( input_thread_t *p_input )
 185 {
 186     /* Make the thread exit from a possible vlc_cond_wait() */
 187     vlc_mutex_lock( &p_input->stream.stream_lock );
 188     /* Request thread destruction */
 189     p_input->b_die = 1;
 190
 191     vlc_cond_signal( &p_input->stream.stream_wait );
 192     vlc_mutex_unlock( &p_input->stream.stream_lock );
 193 }
 194
 195 /*****************************************************************************
 196  * input_DestroyThread: mark an input thread as zombie
 197  *****************************************************************************
 198  * This function should not return until the thread is effectively cancelled.
 199  *****************************************************************************/
 200 void input_DestroyThread( input_thread_t *p_input )
 201 {
 202     /* Join the thread */
 203     vlc_thread_join( p_input );
 204
 205     /* Destroy Mutex locks */
 206     vlc_mutex_destroy( &p_input->stream.control.control_lock );
 207     vlc_cond_destroy( &p_input->stream.stream_wait );
 208     vlc_mutex_destroy( &p_input->stream.stream_lock );
 209 }
 210
 211 /*****************************************************************************
 212  * RunThread: main thread loop
 213  *****************************************************************************
 214  * Thread in charge of processing the network packets and demultiplexing.
 215  *****************************************************************************/
 216 static int RunThread( input_thread_t *p_input )
 217 {
 218     /* Signal right now, otherwise we'll get stuck in a peek */
 219     vlc_thread_ready( p_input );
 220
 221     if( InitThread( p_input ) )
 222     {
 223         /* If we failed, wait before we are killed, and exit */
 224         p_input->b_error = 1;
 225         ErrorThread( p_input );
 226         p_input->b_dead = 1;
 227         return 0;
 228     }
 229
 230     /* initialization is complete */
 231     vlc_mutex_lock( &p_input->stream.stream_lock );
 232     p_input->stream.b_changed = 1;
 233     vlc_mutex_unlock( &p_input->stream.stream_lock );
 234
 235     while( !p_input->b_die && !p_input->b_error && !p_input->b_eof )
 236     {
 237         int i, i_count;
 238
 239         p_input->c_loops++;
 240
 241         vlc_mutex_lock( &p_input->stream.stream_lock );
 242
 243         if( p_input->stream.p_new_program )
 244         {
 245             if( p_input->pf_set_program != NULL )
 246             {
 247
 248                 /* Reinitialize buffer manager. */
 249                 input_AccessReinit( p_input );
 250
 251                 p_input->pf_set_program( p_input,
 252                         p_input->stream.p_new_program );
 253
 254                 /* Escape all decoders for the stream discontinuity they
 255                  * will encounter. */
 256                 input_EscapeDiscontinuity( p_input );
 257
 258                 for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
 259                 {
 260                     pgrm_descriptor_t * p_pgrm
 261                                             = p_input->stream.pp_programs[i];
 262
 263                     /* Reinitialize synchro. */
 264                     p_pgrm->i_synchro_state = SYNCHRO_REINIT;
 265                 }
 266             }
 267             p_input->stream.p_new_program = NULL;
 268         }
 269
 270         if( p_input->stream.p_new_area )
 271         {
 272             if( p_input->stream.b_seekable && p_input->pf_set_area != NULL )
 273             {
 274                 input_AccessReinit( p_input );
 275
 276                 p_input->pf_set_area( p_input, p_input->stream.p_new_area );
 277
 278                 /* Escape all decoders for the stream discontinuity they
 279                  * will encounter. */
 280                 input_EscapeDiscontinuity( p_input );
 281
 282                 for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
 283                 {
 284                     pgrm_descriptor_t * p_pgrm
 285                                             = p_input->stream.pp_programs[i];
 286
 287                     /* Reinitialize synchro. */
 288                     p_pgrm->i_synchro_state = SYNCHRO_REINIT;
 289                 }
 290             }
 291             p_input->stream.p_new_area = NULL;
 292         }
 293
 294         if( p_input->stream.p_selected_area->i_seek != NO_SEEK )
 295         {
 296             if( p_input->stream.b_seekable && p_input->pf_seek != NULL )
 297             {
 298                 off_t i_new_pos;
 299
 300                 /* Reinitialize buffer manager. */
 301                 input_AccessReinit( p_input );
 302
 303                 i_new_pos = p_input->stream.p_selected_area->i_seek;
 304                 vlc_mutex_unlock( &p_input->stream.stream_lock );
 305                 p_input->pf_seek( p_input, i_new_pos );
 306                 vlc_mutex_lock( &p_input->stream.stream_lock );
 307
 308                 /* Escape all decoders for the stream discontinuity they
 309                  * will encounter. */
 310                 input_EscapeDiscontinuity( p_input );
 311
 312                 for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
 313                 {
 314                     pgrm_descriptor_t * p_pgrm
 315                                             = p_input->stream.pp_programs[i];
 316
 317                     /* Reinitialize synchro. */
 318                     p_pgrm->i_synchro_state = SYNCHRO_REINIT;
 319                 }
 320             }
 321             p_input->stream.p_selected_area->i_seek = NO_SEEK;
 322         }
 323
 324         if( p_input->stream.p_removed_es )
 325         {
 326             input_UnselectES( p_input, p_input->stream.p_removed_es );
 327             p_input->stream.p_removed_es = NULL;
 328         }
 329
 330         if( p_input->stream.p_newly_selected_es )
 331         {
 332             input_SelectES( p_input, p_input->stream.p_newly_selected_es );
 333             p_input->stream.p_newly_selected_es = NULL;
 334         }
 335
 336         if( p_input->stream.b_new_mute != MUTE_NO_CHANGE )
 337         {
 338             if( p_input->stream.b_new_mute )
 339             {
 340                 input_EscapeAudioDiscontinuity( p_input );
 341             }
 342
 343             vlc_mutex_lock( &p_input->stream.control.control_lock );
 344             p_input->stream.control.b_mute = p_input->stream.b_new_mute;
 345             vlc_mutex_unlock( &p_input->stream.control.control_lock );
 346
 347             p_input->stream.b_new_mute = MUTE_NO_CHANGE;
 348         }
 349
 350         vlc_mutex_unlock( &p_input->stream.stream_lock );
 351
 352         /* Read and demultiplex some data. */
 353         i_count = p_input->pf_demux( p_input );
 354
 355         if( i_count == 0 && p_input->stream.b_seekable )
 356         {
 357             /* End of file - we do not set b_die because only the
 358              * interface is allowed to do so. */
 359             msg_Info( p_input, "EOF reached" );
 360             p_input->b_eof = 1;
 361         }
 362         else if( i_count < 0 )
 363         {
 364             p_input->b_error = 1;
 365         }
 366     }
 367
 368     if( p_input->b_error || p_input->b_eof )
 369     {
 370         ErrorThread( p_input );
 371     }
 372
 373     EndThread( p_input );
 374
 375     return 0;
 376 }
 377
 378 /*****************************************************************************
 379  * InitThread: init the input Thread
 380  *****************************************************************************/
 381 static int InitThread( input_thread_t * p_input )
 382 {
 383     /* Parse source string. Syntax : [[<access>][/<demux>]:][<source>] */
 384     char * psz_parser = p_input->psz_source;
 385
 386     /* Skip the plug-in names */
 387     while( *psz_parser && *psz_parser != ':' )
 388     {
 389         psz_parser++;
 390     }
 391 #ifdef WIN32
 392     if( psz_parser - p_input->psz_source == 1 )
 393     {
 394         msg_Warn( p_input, "drive letter %c: found in source string",
 395                            p_input->psz_source ) ;
 396         psz_parser = "";
 397     }
 398 #endif
 399
 400     if( !*psz_parser )
 401     {
 402         p_input->psz_access = p_input->psz_demux = "";
 403         p_input->psz_name = p_input->psz_source;
 404     }
 405     else
 406     {
 407         *psz_parser++ = '\0';
 408
 409         /* let's skip '//' */
 410         if( psz_parser[0] == '/' && psz_parser[1] == '/' )
 411         {
 412             psz_parser += 2 ;
 413         }
 414
 415         p_input->psz_name = psz_parser ;
 416
 417         /* Come back to parse the access and demux plug-ins */
 418         psz_parser = p_input->psz_source;
 419
 420         if( !*psz_parser )
 421         {
 422             /* No access */
 423             p_input->psz_access = "";
 424         }
 425         else if( *psz_parser == '/' )
 426         {
 427             /* No access */
 428             p_input->psz_access = "";
 429             psz_parser++;
 430         }
 431         else
 432         {
 433             p_input->psz_access = psz_parser;
 434
 435             while( *psz_parser && *psz_parser != '/' )
 436             {
 437                 psz_parser++;
 438             }
 439
 440             if( *psz_parser == '/' )
 441             {
 442                 *psz_parser++ = '\0';
 443             }
 444         }
 445
 446         if( !*psz_parser )
 447         {
 448             /* No demux */
 449             p_input->psz_demux = "";
 450         }
 451         else
 452         {
 453             p_input->psz_demux = psz_parser;
 454         }
 455     }
 456
 457     msg_Dbg( p_input, "access `%s', demux `%s', name `%s'",
 458              p_input->psz_access, p_input->psz_demux, p_input->psz_name );
 459
 460     if( input_AccessInit( p_input ) == -1 )
 461     {
 462         return -1;
 463     }
 464
 465     /* Find and open appropriate access module */
 466     p_input->p_access_module =
 467         module_Need( p_input, MODULE_CAPABILITY_ACCESS,
 468                      p_input->psz_access, (void *)p_input );
 469
 470     if( p_input->p_access_module == NULL )
 471     {
 472         msg_Err( p_input, "no suitable access module for `%s/%s://%s'",
 473                  p_input->psz_access, p_input->psz_demux, p_input->psz_name );
 474         return -1;
 475     }
 476
 477 #define f p_input->p_access_module->p_functions->access.functions.access
 478     p_input->pf_open          = f.pf_open;
 479     p_input->pf_close         = f.pf_close;
 480     p_input->pf_read          = f.pf_read;
 481     p_input->pf_set_area      = f.pf_set_area;
 482     p_input->pf_set_program   = f.pf_set_program;
 483     p_input->pf_seek          = f.pf_seek;
 484 #undef f
 485
 486     /* Waiting for stream. */
 487     if( p_input->i_mtu )
 488     {
 489         p_input->i_bufsize = p_input->i_mtu;
 490     }
 491     else
 492     {
 493         p_input->i_bufsize = INPUT_DEFAULT_BUFSIZE;
 494     }
 495
 496     if( p_input->p_current_data == NULL && p_input->pf_read != NULL )
 497     {
 498         while( !input_FillBuffer( p_input ) )
 499         {
 500             if( p_input->b_die || p_input->b_error || p_input->b_eof )
 501             {
 502                 module_Unneed( p_input->p_access_module );
 503                 return -1;
 504             }
 505         }
 506     }
 507
 508     /* Find and open appropriate demux module */
 509     p_input->p_demux_module =
 510         module_Need( p_input, MODULE_CAPABILITY_DEMUX,
 511                      p_input->psz_demux, (void *)p_input );
 512
 513     if( p_input->p_demux_module == NULL )
 514     {
 515         msg_Err( p_input, "no suitable demux module for `%s/%s://%s'",
 516                  p_input->psz_access, p_input->psz_demux, p_input->psz_name );
 517         module_Unneed( p_input->p_access_module );
 518         return -1;
 519     }
 520
 521 #define f p_input->p_demux_module->p_functions->demux.functions.demux
 522     p_input->pf_init          = f.pf_init;
 523     p_input->pf_end           = f.pf_end;
 524     p_input->pf_demux         = f.pf_demux;
 525     p_input->pf_rewind        = f.pf_rewind;
 526 #undef f
 527
 528     return 0;
 529 }
 530
 531 /*****************************************************************************
 532  * ErrorThread: RunThread() error loop
 533  *****************************************************************************
 534  * This function is called when an error occured during thread main's loop.
 535  *****************************************************************************/
 536 static void ErrorThread( input_thread_t *p_input )
 537 {
 538     while( !p_input->b_die )
 539     {
 540         /* Sleep a while */
 541         msleep( INPUT_IDLE_SLEEP );
 542     }
 543 }
 544
 545 /*****************************************************************************
 546  * EndThread: end the input thread
 547  *****************************************************************************/
 548 static void EndThread( input_thread_t * p_input )
 549 {
 550 #ifdef HAVE_SYS_TIMES_H
 551     /* Display statistics */
 552     struct tms  cpu_usage;
 553     times( &cpu_usage );
 554
 555     msg_Dbg( p_input, "%d loops consuming user: %d, system: %d",
 556              p_input->c_loops, cpu_usage.tms_utime, cpu_usage.tms_stime );
 557 #else
 558     msg_Dbg( p_input, "%d loops", p_input->c_loops );
 559 #endif
 560
 561     /* Free info structures */
 562     msg_Dbg( p_input, "freeing info structures...");
 563     input_DelInfo( p_input );
 564
 565     input_DumpStream( p_input );
 566
 567     /* Free all ES and destroy all decoder threads */
 568     input_EndStream( p_input );
 569
 570     /* Free demultiplexer's data */
 571     p_input->pf_end( p_input );
 572     module_Unneed( p_input->p_demux_module );
 573
 574     /* Close the access plug-in */
 575     p_input->pf_close( p_input );
 576     module_Unneed( p_input->p_access_module );
 577
 578     input_AccessEnd( p_input );
 579
 580     free( p_input->psz_source );
 581
 582     /* Tell we're dead */
 583     p_input->b_dead = 1;
 584 }
 585