git.sesse.net Git - vlc/blob - modules/control/joystick.c

   1 /*****************************************************************************
   2  * joystick.c: control vlc with a joystick
   3  *****************************************************************************
   4  * Copyright (C) 2004 VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Clément Stenac <zorglub@via.ecp.fr>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <stdlib.h>                                      /* malloc(), free() */
  28 #include <string.h>
  29 #include <unistd.h>
  30
  31 #include <sys/types.h>
  32 #include <sys/stat.h>
  33 #include <sys/select.h>
  34
  35 #include <errno.h>
  36
  37 #include <fcntl.h>
  38
  39 #include <vlc/vlc.h>
  40 #include <vlc/intf.h>
  41 #include <vlc/vout.h>
  42
  43 #include <linux/joystick.h>
  44
  45 #include "audio_output.h"
  46 #include "stream_control.h"
  47 #include "input_ext-intf.h"
  48
  49 /* Default values for parameters */
  50 #define DEFAULT_MAX_SEEK        10 /* seconds */
  51 #define DEFAULT_REPEAT          100
  52 #define DEFAULT_WAIT            500
  53 #define DEFAULT_DEVICE          "/dev/input/js0"
  54 #define DEFAULT_THRESHOLD       12000  /* 0 -> 32767 */
  55
  56 #define DEFAULT_MAPPING \
  57     "{axis-0-up=forward,axis-0-down=back," \
  58     "axis-1-up=next,axis-1-down=prev," \
  59     "butt-1-down=play,butt-2-down=fullscreen}"
  60
  61 /* Default Actions (used if there are missing actions in the default
  62  * Available actions are: Next,Prev, Forward,Back,Play,Fullscreen,dummy */
  63 #define AXE_0_UP_ACTION         Forward
  64 #define AXE_0_DOWN_ACTION       Back
  65 #define AXE_1_UP_ACTION         Next
  66 #define AXE_1_DOWN_ACTION       Prev
  67
  68 #define BUTTON_1_PRESS_ACTION   Play
  69 #define BUTTON_1_RELEASE_ACTION dummy
  70 #define BUTTON_2_PRESS_ACTION   Fullscreen
  71 #define BUTTON_2_RELEASE_ACTION dummy
  72
  73 /*****************************************************************************
  74  * intf_sys_t: description and status of interface
  75  *****************************************************************************/
  76
  77 typedef int (*action)(intf_thread_t *p_intf);
  78
  79 struct joy_axis_t
  80 {
  81     int         b_trigered;     /* Are we in the trigger zone ? */
  82     int         i_value;        /* Value of movement */
  83     int         b_dowork;       /* Do we have to do the action ? */
  84     action      pf_actup;       /* Action when axis is up */
  85     action      pf_actdown;     /* Action when axis is down */
  86     mtime_t     l_time;         /* When did the axis enter the trigger
  87                                  * zone ? */
  88 };
  89
  90 struct joy_button_t
  91 {
  92     action      pf_actup;  /* What to do when button is released */
  93     action      pf_actdown;/* What to do when button is pressed */
  94 };
  95
  96 struct intf_sys_t
  97 {
  98     fd_set              fds;            /* File descriptor set (select) */
  99     int                 i_fd;           /* File descriptor for joystick */
 100     struct timeval      timeout;        /* Select timeout */
 101     int                 i_threshold;    /* motion threshold */
 102     int                 i_wait;         /* How much to wait before repeat */
 103     int                 i_repeat;       /* Repeat time */
 104     int                 i_maxseek;      /* Maximum seek time */
 105     struct joy_axis_t   axes[3];        /* Axes descriptor */
 106     struct joy_button_t buttons[2];     /* Buttons descriptor */
 107     input_thread_t      *p_input;       /* Input thread (for seeking) */
 108     float               f_seconds;      /* How much to seek */
 109 };
 110
 111 /*****************************************************************************
 112  * Local prototypes.
 113  *****************************************************************************/
 114
 115 static int  Open   ( vlc_object_t * );
 116 static void Close  ( vlc_object_t * );
 117 static int  Init   ( intf_thread_t *p_intf );
 118
 119 static int handle_event   ( intf_thread_t *p_intf, struct js_event event );
 120
 121
 122 /* Actions */
 123 static int Next        (intf_thread_t *p_intf);
 124 static int Prev        (intf_thread_t *p_intf);
 125 static int Back        (intf_thread_t *p_intf);
 126 static int Forward     (intf_thread_t *p_intf);
 127 static int Play        (intf_thread_t *p_intf);
 128 static int Fullscreen  (intf_thread_t *p_intf);
 129
 130 static int dummy       (intf_thread_t *p_intf);
 131
 132 /* Exported functions */
 133 static void Run       ( intf_thread_t *p_intf );
 134
 135 /*****************************************************************************
 136  * Module descriptor
 137  *****************************************************************************/
 138 #define THRESHOLD_TEXT N_( "Motion threshold" )
 139 #define THRESHOLD_LONGTEXT N_( \
 140     "Amount of joystick movement required for a movement to be " \
 141     "recorded (0->32767)." )
 142
 143 #define DEVICE_TEXT N_( "Joystick device" )
 144 #define DEVICE_LONGTEXT N_( \
 145     "The joystick device (usually /dev/js0 or /dev/input/js0).")
 146
 147 #define REPEAT_TEXT N_( "Repeat time (ms)" )
 148 #define REPEAT_LONGTEXT N_( \
 149     "Delay waited before the action is repeated if it is still " \
 150     "triggered, in milliseconds." )
 151
 152 #define WAIT_TEXT N_( "Wait time (ms)")
 153 #define WAIT_LONGTEXT N_(\
 154    "The time waited before the repeat starts, in milliseconds.")
 155
 156 #define SEEK_TEXT N_( "Max seek interval (seconds)")
 157 #define SEEK_LONGTEXT N_(\
 158    "The maximum number of seconds that will be sought at a time." )
 159
 160 #define MAP_TEXT N_( "Action mapping")
 161 #define MAP_LONGTEXT N_( "Allows you to remap the actions." )
 162
 163 vlc_module_begin();
 164     add_integer( "motion-threshold", DEFAULT_THRESHOLD , NULL,
 165                      THRESHOLD_TEXT, THRESHOLD_LONGTEXT, VLC_TRUE );
 166     add_string( "joystick-device", DEFAULT_DEVICE , NULL,
 167                      DEVICE_TEXT, DEVICE_LONGTEXT, VLC_TRUE );
 168     add_integer ("joystick-repeat", DEFAULT_REPEAT,NULL,
 169                      REPEAT_TEXT, REPEAT_LONGTEXT, VLC_TRUE );
 170     add_integer ("joystick-wait", DEFAULT_WAIT,NULL,
 171                      WAIT_TEXT, WAIT_LONGTEXT, VLC_TRUE );
 172     add_integer ("joystick-max-seek",DEFAULT_MAX_SEEK,NULL,
 173                      SEEK_TEXT, SEEK_LONGTEXT, VLC_TRUE );
 174     add_string("joystick-mapping",DEFAULT_MAPPING,NULL,
 175                     MAP_TEXT,MAP_LONGTEXT, VLC_TRUE );
 176     set_description( _("Joystick control interface") );
 177     set_capability( "interface", 0 );
 178     set_callbacks( Open, Close );
 179 vlc_module_end();
 180
 181 /*****************************************************************************
 182  * Open: initialize interface
 183  *****************************************************************************/
 184 static int Open ( vlc_object_t *p_this )
 185 {
 186     intf_thread_t *p_intf = (intf_thread_t *)p_this;
 187
 188     /* Allocate instance and initialize some members */
 189     p_intf->p_sys = malloc( sizeof( intf_sys_t ) );
 190
 191     if( p_intf->p_sys == NULL )
 192     {
 193         return 1 ;
 194     }
 195
 196     p_intf->pf_run = Run;
 197
 198     return 0 ;
 199 }
 200
 201 /*****************************************************************************
 202  * Close: destroy the interface
 203  *****************************************************************************/
 204 static void Close ( vlc_object_t *p_this )
 205 {
 206     intf_thread_t *p_intf = (intf_thread_t *)p_this;
 207
 208     /* Destroy structure */
 209     if(p_intf->p_sys)
 210         free( p_intf->p_sys );
 211 }
 212
 213
 214 /*****************************************************************************
 215  * Run: main loop
 216  *****************************************************************************/
 217 static void Run( intf_thread_t *p_intf )
 218 {
 219     int i_sel_res = 0;
 220     int i_read    = 0;
 221     int i_axe     = 0;
 222     struct js_event event;
 223
 224     if( Init( p_intf ) < 0 )
 225     {
 226         msg_Err( p_intf, "can't initialize intf" );
 227         return;
 228     }
 229     msg_Dbg( p_intf, "intf initialized" );
 230
 231     /* Main loop */
 232     while( !p_intf->b_die )
 233     {
 234         vlc_mutex_lock( &p_intf->change_lock );
 235
 236         FD_ZERO( &p_intf->p_sys->fds );
 237         FD_SET( p_intf->p_sys->i_fd , &p_intf->p_sys->fds );
 238
 239         p_intf->p_sys->timeout.tv_sec  = 0;
 240         p_intf->p_sys->timeout.tv_usec = p_intf->p_sys->i_repeat;
 241
 242
 243         i_sel_res = select ( p_intf->p_sys->i_fd+1,
 244                         &p_intf->p_sys->fds,
 245                         NULL,
 246                         NULL,
 247                         &p_intf->p_sys->timeout );
 248
 249         p_intf->p_sys->p_input = (input_thread_t *)
 250            vlc_object_find( p_intf, VLC_OBJECT_INPUT, FIND_ANYWHERE );
 251
 252         if( i_sel_res == -1 && errno != EINTR )
 253         {
 254             msg_Err( p_intf, "select error: %s",strerror(errno) );
 255         }
 256         else if(i_sel_res > 0 && FD_ISSET( p_intf->p_sys->i_fd,
 257                                 &p_intf->p_sys->fds))
 258         { /* We got an event */
 259             memset(&event,0,sizeof(struct js_event));
 260             i_read = read( p_intf->p_sys->i_fd, &event ,
 261                                     sizeof(struct js_event));
 262             handle_event( p_intf , event ) ;
 263         }
 264         else if(i_sel_res == 0)
 265         /*We have no event, but check if we have an action to repeat */
 266         {
 267             for(i_axe=0;i_axe<=1;i_axe++)
 268             {
 269                 if( p_intf->p_sys->axes[i_axe].b_trigered &&
 270                     mdate()-p_intf->p_sys->axes[i_axe].l_time >
 271                         p_intf->p_sys->i_wait &&
 272                     p_intf->p_sys->axes[i_axe].i_value > 0 )
 273                 {
 274                     p_intf->p_sys->axes[i_axe].pf_actup(p_intf);
 275                 }
 276
 277                 if( p_intf->p_sys->axes[i_axe].b_trigered &&
 278                     mdate()-p_intf->p_sys->axes[i_axe].l_time >
 279                           p_intf->p_sys->i_wait &&
 280                     p_intf->p_sys->axes[i_axe].i_value < 0 )
 281                 {
 282                     p_intf->p_sys->axes[i_axe].pf_actdown(p_intf);
 283                 }
 284             }
 285         }
 286
 287         if(p_intf->p_sys->p_input)
 288                 vlc_object_release (p_intf->p_sys->p_input);
 289
 290         vlc_mutex_unlock ( &p_intf->change_lock );
 291     }
 292 }
 293
 294 /*****************************************************************************
 295  * InitThread: Initialize the interface
 296  *****************************************************************************/
 297 static int Init( intf_thread_t * p_intf )
 298 {
 299     char *psz_device;
 300     char *psz_parse;
 301     char *psz_eof;  /* end of field */
 302
 303     if( !p_intf->b_die )
 304     {
 305         vlc_mutex_lock( &p_intf->change_lock );
 306
 307         psz_device=config_GetPsz( p_intf, "joystick-device");
 308
 309         if(!psz_device) /* strange... */
 310             psz_device = strdup( DEFAULT_DEVICE );
 311
 312         p_intf->p_sys->i_fd = open ( psz_device , O_RDONLY|O_NONBLOCK );
 313
 314         if( p_intf->p_sys->i_fd == -1 )
 315         {
 316             msg_Warn( p_intf, "unable to open %s for reading: %s"
 317                                 ,psz_device,strerror(errno));
 318             return -1;
 319         }
 320
 321         p_intf->p_sys->i_repeat = 1000*
 322                         config_GetInt( p_intf, "joystick-repeat");
 323
 324         p_intf->p_sys->i_wait = 1000*
 325                         config_GetInt( p_intf, "joystick-wait");
 326
 327         p_intf->p_sys->i_threshold =
 328                         config_GetInt( p_intf, "motion-threshold" );
 329
 330         if(p_intf->p_sys->i_threshold > 32767 ||
 331                       p_intf->p_sys->i_threshold < 0 )
 332                 p_intf->p_sys->i_threshold = DEFAULT_THRESHOLD;
 333
 334         p_intf->p_sys->i_maxseek =
 335                         config_GetInt( p_intf, "joystick-max-seek" );
 336
 337
 338         psz_parse = config_GetPsz( p_intf, "joystick-mapping" ) ;
 339
 340         if ( ! psz_parse)
 341         {
 342             msg_Warn (p_intf,"invalid mapping. aborting." );
 343             return -1;
 344         }
 345         if( !strlen( psz_parse ) )
 346         {
 347             msg_Warn( p_intf, "invalid mapping, aborting." );
 348             return -1;
 349         }
 350
 351         p_intf->p_sys->axes[0].pf_actup  = AXE_0_UP_ACTION;
 352         p_intf->p_sys->axes[0].pf_actdown  = AXE_0_DOWN_ACTION;
 353         p_intf->p_sys->axes[1].pf_actup  = AXE_1_UP_ACTION;
 354         p_intf->p_sys->axes[1].pf_actdown  = AXE_1_DOWN_ACTION;
 355
 356         p_intf->p_sys->buttons[0].pf_actdown = BUTTON_1_PRESS_ACTION;
 357         p_intf->p_sys->buttons[0].pf_actup   = BUTTON_1_RELEASE_ACTION;
 358         p_intf->p_sys->buttons[1].pf_actdown = BUTTON_2_PRESS_ACTION;
 359         p_intf->p_sys->buttons[1].pf_actup   = BUTTON_2_RELEASE_ACTION;
 360
 361 /* Macro to parse the command line */
 362 #define PARSE(name,function)                                                  \
 363     if(!strncmp( psz_parse , name , strlen( name ) ) )                        \
 364     {                                                                         \
 365         psz_parse += strlen( name );                                          \
 366         psz_eof = strchr( psz_parse , ',' );                                  \
 367         if( !psz_eof)                                                         \
 368             psz_eof = strchr( psz_parse, '}' );                               \
 369         if( !psz_eof)                                                         \
 370             psz_eof = psz_parse + strlen(psz_parse);                          \
 371         if( psz_eof )                                                         \
 372         {                                                                     \
 373             *psz_eof = '\0' ;                                                 \
 374         }                                                                     \
 375         msg_Dbg(p_intf,"%s -> %s", name,psz_parse) ;                          \
 376         if(!strcasecmp( psz_parse , "play" ) ) function = Play;               \
 377         if(!strcasecmp( psz_parse , "next" ) ) function = Next;               \
 378         if(!strcasecmp( psz_parse , "prev" ) ) function = Prev;               \
 379         if(!strcasecmp( psz_parse , "fullscreen" ) ) function = Fullscreen;   \
 380         if(!strcasecmp( psz_parse , "forward" ) ) function = Forward;         \
 381         if(!strcasecmp( psz_parse , "back" ) ) function = Back;               \
 382         psz_parse = psz_eof;                                                  \
 383         psz_parse ++;                                                         \
 384         continue;                                                             \
 385     }                                                                         \
 386
 387         while(1)
 388         {
 389             PARSE("axis-0-up="   ,p_intf->p_sys->axes[0].pf_actup      );
 390             PARSE("axis-0-down=" ,p_intf->p_sys->axes[0].pf_actdown    );
 391             PARSE("axis-1-up="   ,p_intf->p_sys->axes[1].pf_actup      );
 392             PARSE("axis-1-down=" ,p_intf->p_sys->axes[1].pf_actdown    );
 393
 394             PARSE("butt-1-up="   ,p_intf->p_sys->buttons[0].pf_actup   );
 395             PARSE("butt-1-down=" ,p_intf->p_sys->buttons[0].pf_actdown );
 396             PARSE("butt-2-up="   ,p_intf->p_sys->buttons[1].pf_actup   );
 397             PARSE("butt-2-down=" ,p_intf->p_sys->buttons[1].pf_actdown );
 398
 399             if( *psz_parse )
 400                 psz_parse++;
 401             else
 402                 break;
 403          }
 404
 405         p_intf->p_sys->axes[0].b_trigered = VLC_FALSE;
 406         p_intf->p_sys->axes[0].l_time     = 0;
 407
 408         p_intf->p_sys->axes[1].b_trigered = VLC_FALSE;
 409         p_intf->p_sys->axes[1].l_time     = 0;
 410
 411         vlc_mutex_unlock( &p_intf->change_lock );
 412
 413         return 0;
 414     }
 415     else
 416     {
 417         return -1;
 418     }
 419 }
 420
 421 /*****************************************************************************
 422  * handle_event : parse a joystick event and takes the appropriate action    *
 423  *****************************************************************************/
 424 static int handle_event ( intf_thread_t *p_intf, struct js_event event)
 425 {
 426     unsigned int i_axe;
 427
 428     if( event.type == JS_EVENT_AXIS )
 429     {
 430        /* Third axe is supposed to behave in a different way:
 431         *  it is a throttle, and will set a value, without
 432         * triggering something */
 433         if( event.number == 2 &&
 434             /* Try to avoid Parkinson joysticks */
 435             abs(event.value - p_intf->p_sys->axes[2].i_value) > 200 )
 436         {
 437             p_intf->p_sys->axes[2].i_value = event.value;
 438             msg_Dbg( p_intf , "updating volume" );
 439             /* This way, the volume is between 0 and 1024 */
 440             aout_VolumeSet( p_intf, (32767-event.value)/64 );
 441             return 0;
 442         }
 443
 444         p_intf->p_sys->axes[event.number].b_dowork = VLC_FALSE;
 445         p_intf->p_sys->axes[event.number].i_value  = event.value;
 446
 447         if( abs(event.value) > p_intf->p_sys->i_threshold &&
 448              p_intf->p_sys->axes[event.number].b_trigered == VLC_FALSE)
 449         {
 450         /* The axis entered the trigger zone. Start the event */
 451             p_intf->p_sys->axes[event.number].b_trigered = VLC_TRUE;
 452             p_intf->p_sys->axes[event.number].b_dowork   = VLC_TRUE;
 453             p_intf->p_sys->axes[event.number].l_time     = mdate();
 454         }
 455         else if(abs(event.value) > p_intf->p_sys->i_threshold &&
 456             p_intf->p_sys->axes[event.number].b_trigered == VLC_TRUE)
 457         {
 458         /* The axis moved but remained in the trigger zone
 459          * Do nothing at this time */
 460         }
 461         else if ( abs(event.value) < p_intf->p_sys->i_threshold )
 462         {
 463         /* The axis is not in the trigger zone */
 464             p_intf->p_sys->axes[event.number].b_trigered = VLC_FALSE;
 465         }
 466
 467         /* Special for seeking */
 468         p_intf->p_sys->f_seconds = 1+
 469             (abs(event.value)-p_intf->p_sys->i_threshold)*
 470             (p_intf->p_sys->i_maxseek - 1 )/
 471             (32767-p_intf->p_sys->i_threshold);
 472
 473
 474         /* Handle the first two axes. */
 475         for(i_axe = 0; i_axe <= 1 ; i_axe ++)
 476         {
 477             if(p_intf->p_sys->axes[i_axe].b_dowork == VLC_TRUE)
 478             {
 479                 if( p_intf->p_sys->axes[i_axe].i_value
 480                               > p_intf->p_sys->i_threshold )
 481                 {
 482                     msg_Dbg(p_intf,"up for axis %i\n",i_axe);
 483                     p_intf->p_sys->axes[i_axe].pf_actup(p_intf);
 484                 }
 485                 else if( p_intf->p_sys->axes[i_axe].i_value
 486                                 < -p_intf->p_sys->i_threshold )
 487                 {
 488                     msg_Dbg(p_intf,"down for axis %i\n",i_axe);
 489                     p_intf->p_sys->axes[i_axe].pf_actdown(p_intf);
 490                 }
 491
 492             }
 493         }
 494     }
 495     else if( event.type == JS_EVENT_BUTTON)
 496     {
 497         msg_Dbg(p_intf,"button %i %s",event.number,
 498                         event.value ? "pressed":"released");
 499         if(event.number >1) return 0; /* Only trigger 2 buttons */
 500         if(event.value == 1) /* Button pressed */
 501         {
 502             if(p_intf->p_sys->buttons[event.number].pf_actdown)
 503                 p_intf->p_sys->buttons[event.number].pf_actdown(p_intf);
 504         }
 505         else /* Button released */
 506             if(p_intf->p_sys->buttons[event.number].pf_actup)
 507                 p_intf->p_sys->buttons[event.number].pf_actup(p_intf);
 508     }
 509     return 0;
 510 }
 511
 512 /****************************************************************************
 513  * The actions
 514  ****************************************************************************/
 515
 516 /* Go to next item in the playlist */
 517 static int Next( intf_thread_t *p_intf)
 518 {
 519     playlist_t *p_playlist = vlc_object_find( p_intf, VLC_OBJECT_PLAYLIST,
 520                                    FIND_ANYWHERE );
 521     if( p_playlist == NULL )
 522     {
 523         return -1;
 524     }
 525     playlist_Next( p_playlist );
 526     vlc_object_release( p_playlist );
 527     return 0;
 528 }
 529
 530 /* Go to previous item in the playlist */
 531 static int Prev( intf_thread_t *p_intf)
 532 {
 533     playlist_t *p_playlist = vlc_object_find( p_intf, VLC_OBJECT_PLAYLIST,
 534                                    FIND_ANYWHERE );
 535     if( p_playlist == NULL )
 536     {
 537         return -1;
 538     }
 539     playlist_Prev( p_playlist );
 540     vlc_object_release( p_playlist );
 541     return 0;
 542 }
 543
 544 /* Seek forward */
 545 static int Forward(intf_thread_t *p_intf)
 546 {
 547     if(p_intf->p_sys->p_input)
 548     {
 549         msg_Dbg(p_intf,"seeking %f seconds",p_intf->p_sys->f_seconds);
 550         var_SetTime( p_intf->p_sys->p_input, "time-offset",
 551                      (int64_t)p_intf->p_sys->f_seconds * I64C(1000000) );
 552         return 0;
 553     }
 554     return -1;
 555 }
 556
 557 /* Seek backwards */
 558 static int Back(intf_thread_t *p_intf)
 559 {
 560     if(p_intf->p_sys->p_input)
 561     {
 562         msg_Dbg(p_intf,"seeking -%f seconds",p_intf->p_sys->f_seconds);
 563
 564         var_SetTime( p_intf->p_sys->p_input, "time-offset",
 565                      -(int64_t)p_intf->p_sys->f_seconds * I64C(1000000) );
 566         return 0;
 567     }
 568     return -1;
 569 }
 570
 571 /* Toggle Play/Pause */
 572 static int Play(intf_thread_t *p_intf)
 573 {
 574     if(p_intf->p_sys->p_input)
 575     {
 576         var_SetInteger( p_input, "state", PAUSE_S );
 577         return 0;
 578     }
 579     return -1;
 580 }
 581
 582 /* Toggle fullscreen mode */
 583 static int Fullscreen(intf_thread_t *p_intf)
 584 {
 585     vout_thread_t * p_vout=vlc_object_find(p_intf,
 586                           VLC_OBJECT_VOUT, FIND_ANYWHERE );
 587     if(p_vout)
 588     {
 589         p_vout->i_changes |= VOUT_FULLSCREEN_CHANGE;
 590         vlc_object_release(p_vout);
 591     }
 592     return 0;
 593 }
 594
 595 /* dummy event. Use it if you don't wan't anything to happen */
 596 static int dummy(intf_thread_t *p_intf)
 597 {
 598    return 0;
 599 }