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, 1999, 2000 VideoLAN
   7  * $Id: input.c,v 1.80 2001/02/12 13:20:14 massiot 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 "defs.h"
  30
  31 #include <stdlib.h>
  32 #include <sys/types.h>
  33 #include <sys/stat.h>
  34 #include <fcntl.h>
  35 #include <unistd.h>
  36 #include <string.h>
  37 #include <errno.h>
  38
  39 #ifdef STATS
  40 #   include <sys/times.h>
  41 #endif
  42
  43 #include "config.h"
  44 #include "common.h"
  45 #include "threads.h"
  46 #include "mtime.h"
  47 #include "modules.h"
  48
  49 #include "intf_msg.h"
  50 #include "intf_plst.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 #include "interface.h"
  58
  59 #include "main.h"
  60
  61 /*****************************************************************************
  62  * Local prototypes
  63  *****************************************************************************/
  64 static void RunThread   ( input_thread_t *p_input );
  65 static void InitThread  ( input_thread_t *p_input );
  66 static void ErrorThread ( input_thread_t *p_input );
  67 static void EndThread   ( input_thread_t *p_input );
  68
  69 /*****************************************************************************
  70  * input_CreateThread: creates a new input thread
  71  *****************************************************************************
  72  * This function creates a new input, and returns a pointer
  73  * to its description. On error, it returns NULL.
  74  * If pi_status is NULL, then the function will block until the thread is ready.
  75  * If not, it will be updated using one of the THREAD_* constants.
  76  *****************************************************************************/
  77 input_thread_t *input_CreateThread ( playlist_item_t *p_item, int *pi_status )
  78 {
  79     input_thread_t *    p_input;                        /* thread descriptor */
  80     int                 i_status;                           /* thread status */
  81
  82     /* Allocate descriptor */
  83     p_input = (input_thread_t *)malloc( sizeof(input_thread_t) );
  84     if( p_input == NULL )
  85     {
  86         intf_ErrMsg( "input error: can't allocate input thread (%s)",
  87                      strerror(errno) );
  88         return( NULL );
  89     }
  90
  91     /* Initialize thread properties */
  92     p_input->b_die              = 0;
  93     p_input->b_error            = 0;
  94     p_input->b_eof              = 0;
  95
  96     /* Set target */
  97     p_input->p_source           = p_item->psz_name;
  98
  99     /* I have never understood that stuff --Meuuh */
 100     p_input->pi_status          = (pi_status != NULL) ? pi_status : &i_status;
 101     *p_input->pi_status         = THREAD_CREATE;
 102
 103     /* Initialize stream description */
 104     p_input->stream.i_es_number = 0;
 105     p_input->stream.i_selected_es_number = 0;
 106     p_input->stream.i_pgrm_number = 0;
 107     p_input->stream.i_new_status = p_input->stream.i_new_rate = 0;
 108     p_input->stream.i_seek = NO_SEEK;
 109
 110     /* Initialize stream control properties. */
 111     p_input->stream.control.i_status = PLAYING_S;
 112     p_input->stream.control.i_rate = DEFAULT_RATE;
 113     p_input->stream.control.b_mute = 0;
 114     p_input->stream.control.b_bw = 0;
 115
 116     /* Initialize default settings for spawned decoders */
 117     p_input->p_default_aout = p_main->p_aout;
 118     p_input->p_default_vout = p_main->p_vout;
 119
 120     /* Create thread and set locks. */
 121     vlc_mutex_init( &p_input->stream.stream_lock );
 122     vlc_cond_init( &p_input->stream.stream_wait );
 123     vlc_mutex_init( &p_input->stream.control.control_lock );
 124     if( vlc_thread_create( &p_input->thread_id, "input", (void *) RunThread,
 125                            (void *) p_input ) )
 126     {
 127         intf_ErrMsg( "input error: can't create input thread (%s)",
 128                      strerror(errno) );
 129         free( p_input );
 130         return( NULL );
 131     }
 132
 133     /* If status is NULL, wait until the thread is created */
 134     if( pi_status == NULL )
 135     {
 136         do
 137         {
 138             msleep( THREAD_SLEEP );
 139         } while( (i_status != THREAD_READY) && (i_status != THREAD_ERROR)
 140                 && (i_status != THREAD_FATAL) );
 141         if( i_status != THREAD_READY )
 142         {
 143             return( NULL );
 144         }
 145     }
 146     return( p_input );
 147 }
 148
 149 /*****************************************************************************
 150  * input_DestroyThread: mark an input thread as zombie
 151  *****************************************************************************
 152  * This function should not return until the thread is effectively cancelled.
 153  *****************************************************************************/
 154 void input_DestroyThread( input_thread_t *p_input, int *pi_status )
 155 {
 156     int         i_status;                                   /* thread status */
 157
 158     /* Set status */
 159     p_input->pi_status = (pi_status != NULL) ? pi_status : &i_status;
 160     *p_input->pi_status = THREAD_DESTROY;
 161
 162     /* Request thread destruction */
 163     p_input->b_die = 1;
 164
 165     /* Make the thread exit of an eventual vlc_cond_wait() */
 166     vlc_mutex_lock( &p_input->stream.stream_lock );
 167     vlc_cond_signal( &p_input->stream.stream_wait );
 168     vlc_mutex_unlock( &p_input->stream.stream_lock );
 169
 170     /* If status is NULL, wait until thread has been destroyed */
 171     if( pi_status == NULL )
 172     {
 173         do
 174         {
 175             msleep( THREAD_SLEEP );
 176         } while ( (i_status != THREAD_OVER) && (i_status != THREAD_ERROR)
 177                   && (i_status != THREAD_FATAL) );
 178     }
 179 }
 180
 181 /*****************************************************************************
 182  * RunThread: main thread loop
 183  *****************************************************************************
 184  * Thread in charge of processing the network packets and demultiplexing.
 185  *****************************************************************************/
 186 static void RunThread( input_thread_t *p_input )
 187 {
 188     data_packet_t *         pp_packets[INPUT_READ_ONCE];
 189     int                     i_error, i;
 190
 191     InitThread( p_input );
 192
 193     while( !p_input->b_die && !p_input->b_error && !p_input->b_eof )
 194     {
 195
 196 #ifdef STATS
 197         p_input->c_loops++;
 198 #endif
 199
 200         vlc_mutex_lock( &p_input->stream.stream_lock );
 201         if( p_input->stream.i_seek != NO_SEEK )
 202         {
 203             if( p_input->stream.b_seekable && p_input->pf_seek != NULL )
 204             {
 205                 p_input->pf_seek( p_input, p_input->stream.i_seek );
 206
 207                 for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
 208                 {
 209                     pgrm_descriptor_t * p_pgrm
 210                                             = p_input->stream.pp_programs[i];
 211                     /* Escape all decoders for the stream discontinuity they
 212                      * will encounter. */
 213                     input_EscapeDiscontinuity( p_input, p_pgrm );
 214
 215                     /* Reinitialize synchro. */
 216                     p_pgrm->i_synchro_state = SYNCHRO_REINIT;
 217                 }
 218             }
 219             p_input->stream.i_seek = NO_SEEK;
 220         }
 221         vlc_mutex_unlock( &p_input->stream.stream_lock );
 222
 223         i_error = p_input->pf_read( p_input, pp_packets );
 224
 225         /* Demultiplex read packets. */
 226         for( i = 0; i < INPUT_READ_ONCE && pp_packets[i] != NULL; i++ )
 227         {
 228             p_input->pf_demux( p_input, pp_packets[i] );
 229         }
 230
 231         if( i_error )
 232         {
 233             if( i_error == 1 )
 234             {
 235                 /* End of file - we do not set b_die because only the
 236                  * interface is allowed to do so. */
 237                 intf_WarnMsg( 1, "End of file reached" );
 238                 p_input->b_eof = 1;
 239             }
 240             else
 241             {
 242                 p_input->b_error = 1;
 243             }
 244         }
 245     }
 246
 247     if( p_input->b_error || p_input->b_eof )
 248     {
 249         ErrorThread( p_input );
 250     }
 251
 252     EndThread( p_input );
 253     intf_DbgMsg("Thread end");
 254 }
 255
 256 /*****************************************************************************
 257  * InitThread: init the input Thread
 258  *****************************************************************************/
 259 static void InitThread( input_thread_t * p_input )
 260 {
 261
 262 #ifdef STATS
 263     /* Initialize statistics */
 264     p_input->c_loops                    = 0;
 265     p_input->c_bytes                    = 0;
 266     p_input->c_payload_bytes            = 0;
 267     p_input->c_packets_read             = 0;
 268     p_input->c_packets_trashed          = 0;
 269 #endif
 270
 271     p_input->p_input_module = module_Need( p_main->p_bank,
 272                                            MODULE_CAPABILITY_INPUT, NULL );
 273
 274     if( p_input->p_input_module == NULL )
 275     {
 276         intf_ErrMsg( "input error: no suitable input module" );
 277         p_input->b_error = 1;
 278         return;
 279     }
 280
 281 #define f p_input->p_input_module->p_functions->input.functions.input
 282     p_input->pf_init          = f.pf_init;
 283     p_input->pf_open          = f.pf_open;
 284     p_input->pf_close         = f.pf_close;
 285     p_input->pf_end           = f.pf_end;
 286     p_input->pf_read          = f.pf_read;
 287     p_input->pf_demux         = f.pf_demux;
 288     p_input->pf_new_packet    = f.pf_new_packet;
 289     p_input->pf_new_pes       = f.pf_new_pes;
 290     p_input->pf_delete_packet = f.pf_delete_packet;
 291     p_input->pf_delete_pes    = f.pf_delete_pes;
 292     p_input->pf_rewind        = f.pf_rewind;
 293     p_input->pf_seek          = f.pf_seek;
 294 #undef f
 295
 296     p_input->pf_open( p_input );
 297
 298     if( p_input->b_error )
 299     {
 300         module_Unneed( p_main->p_bank, p_input->p_input_module );
 301     }
 302     else
 303     {
 304         p_input->pf_init( p_input );
 305     }
 306
 307     *p_input->pi_status = THREAD_READY;
 308 }
 309
 310 /*****************************************************************************
 311  * ErrorThread: RunThread() error loop
 312  *****************************************************************************
 313  * This function is called when an error occured during thread main's loop.
 314  *****************************************************************************/
 315 static void ErrorThread( input_thread_t *p_input )
 316 {
 317     while( !p_input->b_die )
 318     {
 319         /* Sleep a while */
 320         msleep( INPUT_IDLE_SLEEP );
 321     }
 322 }
 323
 324 /*****************************************************************************
 325  * EndThread: end the input thread
 326  *****************************************************************************/
 327 static void EndThread( input_thread_t * p_input )
 328 {
 329     int *       pi_status;                                  /* thread status */
 330
 331     /* Store status */
 332     pi_status = p_input->pi_status;
 333     *pi_status = THREAD_END;
 334
 335 #ifdef STATS
 336     {
 337         struct tms cpu_usage;
 338         times( &cpu_usage );
 339
 340         intf_Msg("input stats: cpu usage (user: %d, system: %d)",
 341                  cpu_usage.tms_utime, cpu_usage.tms_stime);
 342     }
 343 #endif
 344
 345     /* Free all ES and destroy all decoder threads */
 346     input_EndStream( p_input );
 347
 348     /* Close stream */
 349     p_input->pf_close( p_input );
 350
 351     /* Free demultiplexer's data */
 352     p_input->pf_end( p_input );
 353
 354     /* Release modules */
 355     module_Unneed( p_main->p_bank, p_input->p_input_module );
 356
 357     /* Destroy Mutex locks */
 358     vlc_mutex_destroy( &p_input->stream.control.control_lock );
 359     vlc_mutex_destroy( &p_input->stream.stream_lock );
 360
 361     /* Free input structure */
 362     free( p_input );
 363
 364     /* Update status */
 365     *pi_status = THREAD_OVER;
 366 }
 367
 368 /*****************************************************************************
 369  * input_FileOpen : open a file descriptor
 370  *****************************************************************************/
 371 void input_FileOpen( input_thread_t * p_input )
 372 {
 373     struct stat         stat_info;
 374
 375     if( stat( p_input->p_source, &stat_info ) == (-1) )
 376     {
 377         intf_ErrMsg( "input error: cannot stat() file `%s' (%s)",
 378                      p_input->p_source, strerror(errno));
 379         p_input->b_error = 1;
 380         return;
 381     }
 382
 383     vlc_mutex_lock( &p_input->stream.stream_lock );
 384
 385     /* If we are here we can control the pace... */
 386     p_input->stream.b_pace_control = 1;
 387
 388     if( S_ISREG(stat_info.st_mode) || S_ISCHR(stat_info.st_mode)
 389          || S_ISBLK(stat_info.st_mode) )
 390     {
 391         p_input->stream.b_seekable = 1;
 392         p_input->stream.i_size = stat_info.st_size;
 393     }
 394     else if( S_ISFIFO(stat_info.st_mode) || S_ISSOCK(stat_info.st_mode) )
 395     {
 396         p_input->stream.b_seekable = 0;
 397         p_input->stream.i_size = 0;
 398     }
 399     else
 400     {
 401         vlc_mutex_unlock( &p_input->stream.stream_lock );
 402         intf_ErrMsg( "input error: unknown file type for `%s'",
 403                      p_input->p_source );
 404         p_input->b_error = 1;
 405         return;
 406     }
 407
 408     p_input->stream.i_tell = 0;
 409     vlc_mutex_unlock( &p_input->stream.stream_lock );
 410
 411     intf_Msg( "input: opening file %s", p_input->p_source );
 412     if( (p_input->i_handle = open( p_input->p_source,
 413                                    /*O_NONBLOCK | O_LARGEFILE*/0 )) == (-1) )
 414     {
 415         intf_ErrMsg( "input error: cannot open file (%s)", strerror(errno) );
 416         p_input->b_error = 1;
 417         return;
 418     }
 419
 420 }
 421
 422 /*****************************************************************************
 423  * input_FileClose : close a file descriptor
 424  *****************************************************************************/
 425 void input_FileClose( input_thread_t * p_input )
 426 {
 427     close( p_input->i_handle );
 428
 429     return;
 430 }
 431