git.sesse.net Git - vlc/blob - modules/video_output/fb.c

   1 /*****************************************************************************
   2  * fb.c : framebuffer plugin for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2000, 2001 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Samuel Hocevar <sam@zoy.org>
   8  *          Jean-Paul Saman
   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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28 #include <errno.h>                                                 /* ENOMEM */
  29 #include <signal.h>                                      /* SIGUSR1, SIGUSR2 */
  30 #include <fcntl.h>                                                 /* open() */
  31 #include <unistd.h>                                               /* close() */
  32
  33 #include <termios.h>                                       /* struct termios */
  34 #include <sys/ioctl.h>
  35 #include <sys/mman.h>                                              /* mmap() */
  36
  37 #include <linux/fb.h>
  38 #include <linux/vt.h>                                                /* VT_* */
  39 #include <linux/kd.h>                                                 /* KD* */
  40
  41 #include <vlc/vlc.h>
  42 #include <vlc_vout.h>
  43
  44 /*****************************************************************************
  45  * Local prototypes
  46  *****************************************************************************/
  47 static int  Create    ( vlc_object_t * );
  48 static void Destroy   ( vlc_object_t * );
  49
  50 static int  Init      ( vout_thread_t * );
  51 static void End       ( vout_thread_t * );
  52 static int  Manage    ( vout_thread_t * );
  53 static void Display   ( vout_thread_t *, picture_t * );
  54 static int  Control   ( vout_thread_t *, int, va_list );
  55
  56 static int  OpenDisplay    ( vout_thread_t * );
  57 static void CloseDisplay   ( vout_thread_t * );
  58 static void SwitchDisplay  ( int i_signal );
  59 static void TextMode       ( int i_tty );
  60 static void GfxMode        ( int i_tty );
  61
  62 /*****************************************************************************
  63  * Module descriptor
  64  *****************************************************************************/
  65 #define FB_DEV_VAR "fbdev"
  66
  67 #define DEVICE_TEXT N_("Framebuffer device")
  68 #define DEVICE_LONGTEXT N_( \
  69     "Framebuffer device to use for rendering (usually /dev/fb0).")
  70
  71 #define TTY_TEXT N_("Run fb on current tty.")
  72 #define TTY_LONGTEXT N_( \
  73     "Run framebuffer on current TTY device (default enabled). " \
  74     "(disable tty handling with caution)" )
  75
  76 #define CHROMA_TEXT N_("Chroma used.")
  77 #define CHROMA_LONGTEXT N_( \
  78     "Force use of a specific chroma for output. Default is I420." )
  79
  80 #define ASPECT_RATIO_TEXT N_("Video aspect ratio")
  81 #define ASPECT_RATIO_LONGTEXT N_( \
  82     "Aspect ratio of the video image (4:3, 16:9). Default is square pixels." )
  83
  84 #define FB_MODE_TEXT N_("Framebuffer resolution to use.")
  85 #define FB_MODE_LONGTEXT N_( \
  86     "Select the resolution for the framebuffer. Currently it supports " \
  87     "the values 0=QCIF 1=CIF 2=NTSC 3=PAL, 4=auto (default 4=auto)" )
  88
  89 vlc_module_begin();
  90     set_shortname( "Framebuffer" );
  91     set_category( CAT_VIDEO );
  92     set_subcategory( SUBCAT_VIDEO_VOUT );
  93     add_file( FB_DEV_VAR, "/dev/fb0", NULL, DEVICE_TEXT, DEVICE_LONGTEXT,
  94               VLC_FALSE );
  95     add_bool( "fb-tty", 1, NULL, TTY_TEXT, TTY_LONGTEXT, VLC_TRUE );
  96     add_string( "fb-chroma", NULL, NULL, CHROMA_TEXT, CHROMA_LONGTEXT,
  97                 VLC_TRUE );
  98     add_string( "fb-aspect-ratio", NULL, NULL, ASPECT_RATIO_TEXT,
  99                 ASPECT_RATIO_LONGTEXT, VLC_TRUE );
 100     add_integer( "fb-mode", 4, NULL, FB_MODE_TEXT, FB_MODE_LONGTEXT,
 101                  VLC_TRUE );
 102     set_description( _("GNU/Linux console framebuffer video output") );
 103     set_capability( "video output", 30 );
 104     set_callbacks( Create, Destroy );
 105 vlc_module_end();
 106
 107 /*****************************************************************************
 108  * vout_sys_t: video output framebuffer method descriptor
 109  *****************************************************************************
 110  * This structure is part of the video output thread descriptor.
 111  * It describes the FB specific properties of an output thread.
 112  *****************************************************************************/
 113 struct vout_sys_t
 114 {
 115     /* System information */
 116     int                 i_tty;                          /* tty device handle */
 117     vlc_bool_t          b_tty;
 118     struct termios      old_termios;
 119
 120     /* Original configuration information */
 121     struct sigaction            sig_usr1;           /* USR1 previous handler */
 122     struct sigaction            sig_usr2;           /* USR2 previous handler */
 123     struct vt_mode              vt_mode;                 /* previous VT mode */
 124
 125     /* Framebuffer information */
 126     int                         i_fd;                       /* device handle */
 127     struct fb_var_screeninfo    old_info;       /* original mode information */
 128     struct fb_var_screeninfo    var_info;        /* current mode information */
 129     vlc_bool_t                  b_pan;     /* does device supports panning ? */
 130     struct fb_cmap              fb_cmap;                /* original colormap */
 131     uint16_t                    *p_palette;              /* original palette */
 132
 133     /* Video information */
 134     uint32_t i_width;
 135     uint32_t i_height;
 136     int i_aspect;
 137     int i_bytes_per_pixel;
 138     vlc_bool_t   b_auto;       /* Automatically adjust video size to fb size */
 139     vlc_fourcc_t i_chroma;
 140
 141     /* Video memory */
 142     byte_t *    p_video;                                      /* base adress */
 143     size_t      i_page_size;                                    /* page size */
 144 };
 145
 146 /*****************************************************************************
 147  * Create: allocates FB video thread output method
 148  *****************************************************************************
 149  * This function allocates and initializes a FB vout method.
 150  *****************************************************************************/
 151 static int Create( vlc_object_t *p_this )
 152 {
 153     vout_thread_t *p_vout = (vout_thread_t *)p_this;
 154     vout_sys_t    *p_sys;
 155     char          *psz_chroma;
 156     char          *psz_aspect;
 157     int           i_mode;
 158     struct sigaction    sig_tty;                 /* sigaction for tty change */
 159     struct vt_mode      vt_mode;                          /* vt current mode */
 160     struct termios      new_termios;
 161
 162     /* Allocate instance and initialize some members */
 163     p_vout->p_sys = p_sys = malloc( sizeof( vout_sys_t ) );
 164     if( p_vout->p_sys == NULL )
 165     {
 166         msg_Err( p_vout, "out of memory" );
 167         return VLC_ENOMEM;
 168     };
 169     memset( p_sys, 0, sizeof(vout_sys_t) );
 170
 171     p_vout->pf_init = Init;
 172     p_vout->pf_end = End;
 173     p_vout->pf_manage = Manage;
 174     p_vout->pf_render = NULL;
 175     p_vout->pf_display = Display;
 176     p_vout->pf_control = Control;
 177
 178     /* Set tty and fb devices */
 179     p_sys->i_tty = 0; /* 0 == /dev/tty0 == current console */
 180     p_sys->b_tty = var_CreateGetBool( p_vout, "fb-tty" );
 181 #ifndef WIN32
 182 #if defined(HAVE_ISATTY)
 183     /* Check that stdin is a TTY */
 184     if( p_sys->b_tty && !isatty( 0 ) )
 185     {
 186         msg_Warn( p_vout, "fd 0 is not a TTY" );
 187         return VLC_EGENERIC;
 188     }
 189     else
 190     {
 191         msg_Warn( p_vout, "disabling tty handling, use with caution because "
 192                           "there is no way to return to the tty." );
 193     }
 194 #endif
 195 #endif
 196
 197     psz_chroma = var_CreateGetNonEmptyString( p_vout, "fb-chroma" );
 198     if( psz_chroma )
 199     {
 200         if( strlen( psz_chroma ) == 4 )
 201         {
 202             p_sys->i_chroma = VLC_FOURCC( psz_chroma[0],
 203                                    psz_chroma[1],
 204                                    psz_chroma[2],
 205                                    psz_chroma[3] );
 206             msg_Dbg( p_vout, "forcing chroma '%s'", psz_chroma );
 207         }
 208         else
 209         {
 210             msg_Warn( p_vout, "invalid chroma (%s), using defaults.",
 211                       psz_chroma );
 212         }
 213         free( psz_chroma );
 214         psz_chroma = NULL;
 215     }
 216
 217     p_sys->i_aspect = -1;
 218     psz_aspect = var_CreateGetNonEmptyString( p_vout, "fb-aspect-ratio" );
 219     if( psz_aspect )
 220     {
 221         char *psz_parser = strchr( psz_aspect, ':' );
 222
 223         if( psz_parser )
 224         {
 225             *psz_parser++ = '\0';
 226             p_sys->i_aspect = ( atoi( psz_aspect )
 227                               * VOUT_ASPECT_FACTOR ) / atoi( psz_parser );
 228         }
 229         msg_Dbg( p_vout, "using aspect ratio %d:%d",
 230                   atoi( psz_aspect ), atoi( psz_parser ) );
 231
 232         free( psz_aspect );
 233         psz_aspect = NULL;
 234     }
 235
 236     p_sys->b_auto = VLC_FALSE;
 237     i_mode = var_CreateGetInteger( p_vout, "fb-mode" );
 238     switch( i_mode )
 239     {
 240         case 0: /* QCIF */
 241             p_sys->i_width  = 176;
 242             p_sys->i_height = 144;
 243             break;
 244         case 1: /* CIF */
 245             p_sys->i_width  = 352;
 246             p_sys->i_height = 288;
 247             break;
 248         case 2: /* NTSC */
 249             p_sys->i_width  = 640;
 250             p_sys->i_height = 480;
 251             break;
 252         case 3: /* PAL */
 253             p_sys->i_width  = 704;
 254             p_sys->i_height = 576;
 255             break;
 256         case 4:
 257         default:
 258             p_sys->b_auto = VLC_TRUE;
 259             break;
 260      }
 261
 262     /* tty handling */
 263     if( p_sys->b_tty )
 264     {
 265         GfxMode( p_sys->i_tty );
 266
 267         /* Set keyboard settings */
 268         if( tcgetattr(0, &p_vout->p_sys->old_termios) == -1 )
 269         {
 270             msg_Err( p_vout, "tcgetattr failed" );
 271         }
 272
 273         if( tcgetattr(0, &new_termios) == -1 )
 274         {
 275             msg_Err( p_vout, "tcgetattr failed" );
 276         }
 277
 278         /* new_termios.c_lflag &= ~ (ICANON | ISIG);
 279         new_termios.c_lflag |= (ECHO | ECHOCTL); */
 280         new_termios.c_lflag &= ~ (ICANON);
 281         new_termios.c_lflag &= ~(ECHO | ECHOCTL);
 282         new_termios.c_iflag = 0;
 283         new_termios.c_cc[VMIN] = 1;
 284         new_termios.c_cc[VTIME] = 0;
 285
 286         if( tcsetattr(0, TCSAFLUSH, &new_termios) == -1 )
 287         {
 288             msg_Err( p_vout, "tcsetattr failed" );
 289         }
 290
 291         ioctl( p_sys->i_tty, VT_RELDISP, VT_ACKACQ );
 292
 293         /* Set-up tty signal handler to be aware of tty changes */
 294         memset( &sig_tty, 0, sizeof( sig_tty ) );
 295         sig_tty.sa_handler = SwitchDisplay;
 296         sigemptyset( &sig_tty.sa_mask );
 297         if( sigaction( SIGUSR1, &sig_tty, &p_vout->p_sys->sig_usr1 ) ||
 298             sigaction( SIGUSR2, &sig_tty, &p_vout->p_sys->sig_usr2 ) )
 299         {
 300             msg_Err( p_vout, "cannot set signal handler (%m)" );
 301             tcsetattr(0, 0, &p_vout->p_sys->old_termios);
 302             TextMode( p_sys->i_tty );
 303             free( p_vout->p_sys );
 304             return VLC_EGENERIC;
 305         }
 306
 307         /* Set-up tty according to new signal handler */
 308         if( -1 == ioctl( p_sys->i_tty, VT_GETMODE, &p_vout->p_sys->vt_mode ) )
 309         {
 310             msg_Err( p_vout, "cannot get terminal mode (%m)" );
 311             sigaction( SIGUSR1, &p_vout->p_sys->sig_usr1, NULL );
 312             sigaction( SIGUSR2, &p_vout->p_sys->sig_usr2, NULL );
 313             tcsetattr(0, 0, &p_vout->p_sys->old_termios);
 314             TextMode( p_sys->i_tty );
 315             free( p_vout->p_sys );
 316             return VLC_EGENERIC;
 317         }
 318         memcpy( &vt_mode, &p_vout->p_sys->vt_mode, sizeof( vt_mode ) );
 319         vt_mode.mode   = VT_PROCESS;
 320         vt_mode.waitv  = 0;
 321         vt_mode.relsig = SIGUSR1;
 322         vt_mode.acqsig = SIGUSR2;
 323
 324         if( -1 == ioctl( p_sys->i_tty, VT_SETMODE, &vt_mode ) )
 325         {
 326             msg_Err( p_vout, "cannot set terminal mode (%m)" );
 327             sigaction( SIGUSR1, &p_vout->p_sys->sig_usr1, NULL );
 328             sigaction( SIGUSR2, &p_vout->p_sys->sig_usr2, NULL );
 329             tcsetattr(0, 0, &p_vout->p_sys->old_termios);
 330             TextMode( p_sys->i_tty );
 331             free( p_vout->p_sys );
 332             return VLC_EGENERIC;
 333         }
 334     }
 335
 336     if( OpenDisplay( p_vout ) )
 337     {
 338         if( p_sys->b_tty )
 339         {
 340             ioctl( p_sys->i_tty, VT_SETMODE, &p_vout->p_sys->vt_mode );
 341             sigaction( SIGUSR1, &p_vout->p_sys->sig_usr1, NULL );
 342             sigaction( SIGUSR2, &p_vout->p_sys->sig_usr2, NULL );
 343             tcsetattr(0, 0, &p_vout->p_sys->old_termios);
 344             TextMode( p_sys->i_tty );
 345         }
 346         free( p_vout->p_sys );
 347         return VLC_EGENERIC;
 348     }
 349
 350     return VLC_SUCCESS;
 351 }
 352
 353 /*****************************************************************************
 354  * Init: initialize framebuffer video thread output method
 355  *****************************************************************************/
 356 static int Init( vout_thread_t *p_vout )
 357 {
 358     vout_sys_t *p_sys = p_vout->p_sys;
 359     int i_index;
 360     picture_t *p_pic;
 361
 362     I_OUTPUTPICTURES = 0;
 363
 364     if( p_sys->i_chroma == 0 )
 365     {
 366         /* Initialize the output structure: RGB with square pixels, whatever
 367          * the input format is, since it's the only format we know */
 368         switch( p_sys->var_info.bits_per_pixel )
 369         {
 370         case 8: /* FIXME: set the palette */
 371             p_vout->output.i_chroma = VLC_FOURCC('R','G','B','2'); break;
 372         case 15:
 373             p_vout->output.i_chroma = VLC_FOURCC('R','V','1','5'); break;
 374         case 16:
 375             p_vout->output.i_chroma = VLC_FOURCC('R','V','1','6'); break;
 376         case 24:
 377             p_vout->output.i_chroma = VLC_FOURCC('R','V','2','4'); break;
 378         case 32:
 379             p_vout->output.i_chroma = VLC_FOURCC('R','V','3','2'); break;
 380         default:
 381             msg_Err( p_vout, "unknown screen depth %i",
 382                      p_vout->p_sys->var_info.bits_per_pixel );
 383             return VLC_EGENERIC;
 384         }
 385
 386         if( p_sys->var_info.bits_per_pixel != 8 )
 387         {
 388             p_vout->output.i_rmask = ( (1 << p_sys->var_info.red.length) - 1 )
 389                                  << p_sys->var_info.red.offset;
 390             p_vout->output.i_gmask = ( (1 << p_sys->var_info.green.length) - 1 )
 391                                  << p_sys->var_info.green.offset;
 392             p_vout->output.i_bmask = ( (1 << p_sys->var_info.blue.length) - 1 )
 393                                  << p_sys->var_info.blue.offset;
 394         }
 395     }
 396     else
 397     {
 398         p_vout->output.i_chroma = p_sys->i_chroma;
 399     }
 400     p_vout->fmt_out.i_chroma = p_vout->output.i_chroma;
 401
 402     if( !p_sys->b_auto )
 403     {
 404         p_vout->render.i_width = p_sys->i_width;
 405         p_vout->render.i_height = p_sys->i_height;
 406     }
 407     p_vout->output.i_width  = p_sys->i_width;
 408     p_vout->output.i_height = p_sys->i_height;
 409
 410     /* Assume we have square pixels */
 411     if( p_sys->i_aspect < 0 )
 412     {
 413         p_vout->output.i_aspect = ( p_sys->i_width
 414                                   * VOUT_ASPECT_FACTOR ) / p_sys->i_height;
 415     }
 416     else p_vout->output.i_aspect = p_sys->i_aspect;
 417
 418     p_vout->fmt_out.i_sar_num = p_vout->fmt_out.i_sar_den = 1;
 419     p_vout->fmt_out.i_aspect  = p_vout->render.i_aspect = p_vout->output.i_aspect;
 420
 421     /* Clear the screen */
 422     memset( p_sys->p_video, 0, p_sys->i_page_size );
 423
 424     /* Try to initialize 1 direct buffer */
 425     p_pic = NULL;
 426
 427     /* Find an empty picture slot */
 428     for( i_index = 0 ; i_index < VOUT_MAX_PICTURES ; i_index++ )
 429     {
 430         if( p_vout->p_picture[ i_index ].i_status == FREE_PICTURE )
 431         {
 432             p_pic = p_vout->p_picture + i_index;
 433             break;
 434         }
 435     }
 436
 437     /* Allocate the picture */
 438     if( p_pic == NULL )
 439     {
 440         return VLC_EGENERIC;
 441     }
 442
 443     /* We know the chroma, allocate a buffer which will be used
 444      * directly by the decoder */
 445     p_pic->p->p_pixels = p_vout->p_sys->p_video;
 446     p_pic->p->i_pixel_pitch = p_vout->p_sys->i_bytes_per_pixel;
 447     p_pic->p->i_lines = p_vout->p_sys->var_info.yres;
 448     p_pic->p->i_visible_lines = p_vout->p_sys->var_info.yres;
 449
 450     if( p_vout->p_sys->var_info.xres_virtual )
 451     {
 452         p_pic->p->i_pitch = p_vout->p_sys->var_info.xres_virtual
 453                              * p_vout->p_sys->i_bytes_per_pixel;
 454     }
 455     else
 456     {
 457         p_pic->p->i_pitch = p_vout->p_sys->var_info.xres
 458                              * p_vout->p_sys->i_bytes_per_pixel;
 459     }
 460
 461     p_pic->p->i_visible_pitch = p_vout->p_sys->var_info.xres
 462                                  * p_vout->p_sys->i_bytes_per_pixel;
 463     p_pic->i_planes = 1;
 464     p_pic->i_status = DESTROYED_PICTURE;
 465     p_pic->i_type   = DIRECT_PICTURE;
 466
 467     PP_OUTPUTPICTURE[ I_OUTPUTPICTURES ] = p_pic;
 468
 469     I_OUTPUTPICTURES++;
 470
 471     return VLC_SUCCESS;
 472 }
 473
 474 /*****************************************************************************
 475  * End: terminate framebuffer video thread output method
 476  *****************************************************************************/
 477 static void End( vout_thread_t *p_vout )
 478 {
 479     /* Clear the screen */
 480     memset( p_vout->p_sys->p_video, 0, p_vout->p_sys->i_page_size );
 481 }
 482
 483 /*****************************************************************************
 484  * Destroy: destroy FB video thread output method
 485  *****************************************************************************
 486  * Terminate an output method created by Create
 487  *****************************************************************************/
 488 static void Destroy( vlc_object_t *p_this )
 489 {
 490     vout_thread_t *p_vout = (vout_thread_t *)p_this;
 491
 492     CloseDisplay( p_vout );
 493
 494     if( p_vout->p_sys->b_tty )
 495     {
 496         /* Reset the terminal */
 497         ioctl( p_vout->p_sys->i_tty, VT_SETMODE, &p_vout->p_sys->vt_mode );
 498
 499         /* Remove signal handlers */
 500         sigaction( SIGUSR1, &p_vout->p_sys->sig_usr1, NULL );
 501         sigaction( SIGUSR2, &p_vout->p_sys->sig_usr2, NULL );
 502
 503         /* Reset the keyboard state */
 504         tcsetattr( 0, 0, &p_vout->p_sys->old_termios );
 505
 506         /* Return to text mode */
 507         TextMode( p_vout->p_sys->i_tty );
 508     }
 509
 510     /* Destroy structure */
 511     free( p_vout->p_sys );
 512 }
 513
 514 /*****************************************************************************
 515  * Control: control facility for the vout
 516  *****************************************************************************/
 517 static int Control( vout_thread_t *p_vout, int i_query, va_list args )
 518 {
 519     switch( i_query )
 520     {
 521        default:
 522             return vout_vaControlDefault( p_vout, i_query, args );
 523     }
 524 }
 525
 526 /*****************************************************************************
 527  * Manage: handle FB events
 528  *****************************************************************************
 529  * This function should be called regularly by video output thread. It manages
 530  * console events. It returns a non null value on error.
 531  *****************************************************************************/
 532 static int Manage( vout_thread_t *p_vout )
 533 {
 534 #if 0
 535     uint8_t buf;
 536
 537     if ( read(0, &buf, 1) == 1)
 538     {
 539         switch( buf )
 540         {
 541         case 'q':
 542             vlc_object_kill( p_vout->p_libvlc );
 543             break;
 544
 545         default:
 546             break;
 547         }
 548     }
 549 #endif
 550
 551     /*
 552      * Size change
 553      */
 554     if( p_vout->i_changes & VOUT_SIZE_CHANGE )
 555     {
 556         msg_Dbg( p_vout, "reinitializing framebuffer screen" );
 557         p_vout->i_changes &= ~VOUT_SIZE_CHANGE;
 558
 559         /* Destroy XImages to change their size */
 560         End( p_vout );
 561
 562         /* Recreate XImages. If SysInit failed, the thread can't go on. */
 563         if( Init( p_vout ) )
 564         {
 565             msg_Err( p_vout, "cannot reinit framebuffer screen" );
 566             return VLC_EGENERIC;
 567         }
 568
 569         /* Clear screen */
 570         memset( p_vout->p_sys->p_video, 0, p_vout->p_sys->i_page_size );
 571
 572 #if 0
 573         /* Tell the video output thread that it will need to rebuild YUV
 574          * tables. This is needed since conversion buffer size may have changed */
 575         p_vout->i_changes |= VOUT_YUV_CHANGE;
 576 #endif
 577     }
 578
 579     return VLC_SUCCESS;
 580 }
 581
 582 /*****************************************************************************
 583  * Display: displays previously rendered output
 584  *****************************************************************************
 585  * This function send the currently rendered image to FB image, waits until
 586  * it is displayed and switch the two rendering buffers, preparing next frame.
 587  *****************************************************************************/
 588 static void Display( vout_thread_t *p_vout, picture_t *p_pic )
 589 {
 590 static int panned=0;
 591     /* swap the two Y offsets if the drivers supports panning */
 592     if( p_vout->p_sys->b_pan )
 593     {
 594         p_vout->p_sys->var_info.yoffset = 0;
 595         /*p_vout->p_sys->var_info.yoffset = p_vout->p_sys->var_info.yres; */
 596
 597         /* the X offset should be 0, but who knows ...
 598          * some other app might have played with the framebuffer */
 599         p_vout->p_sys->var_info.xoffset = 0;
 600
 601         if( panned < 0 )
 602         {
 603             ioctl( p_vout->p_sys->i_fd,
 604                    FBIOPAN_DISPLAY, &p_vout->p_sys->var_info );
 605             panned++;
 606         }
 607     }
 608 }
 609
 610 #if 0
 611 static void SetPalette( vout_thread_t *p_vout, uint16_t *red, uint16_t *green,
 612                                                uint16_t *blue, uint16_t *transp )
 613 {
 614     struct fb_cmap cmap = { 0, 256, red, green, blue, transp };
 615
 616     ioctl( p_vout->p_sys->i_fd, FBIOPUTCMAP, &cmap );
 617 }
 618 #endif
 619
 620 /* following functions are local */
 621
 622 /*****************************************************************************
 623  * OpenDisplay: initialize framebuffer
 624  *****************************************************************************/
 625 static int OpenDisplay( vout_thread_t *p_vout )
 626 {
 627     vout_sys_t *p_sys = (vout_sys_t *) p_vout->p_sys;
 628     char *psz_device;                             /* framebuffer device path */
 629     struct fb_fix_screeninfo    fix_info;     /* framebuffer fix information */
 630
 631     /* Open framebuffer device */
 632     if( !(psz_device = config_GetPsz( p_vout, FB_DEV_VAR )) )
 633     {
 634         msg_Err( p_vout, "don't know which fb device to open" );
 635         return VLC_EGENERIC;
 636     }
 637
 638     p_sys->i_fd = open( psz_device, O_RDWR);
 639     if( p_sys->i_fd == -1 )
 640     {
 641         msg_Err( p_vout, "cannot open %s (%m)", psz_device );
 642         free( psz_device );
 643         return VLC_EGENERIC;
 644     }
 645     free( psz_device );
 646     psz_device = NULL;
 647
 648     /* Get framebuffer device information */
 649     if( ioctl( p_sys->i_fd, FBIOGET_VSCREENINFO, &p_sys->var_info ) )
 650     {
 651         msg_Err( p_vout, "cannot get fb info (%m)" );
 652         close( p_sys->i_fd );
 653         return VLC_EGENERIC;
 654     }
 655
 656     memcpy( &p_sys->old_info, &p_sys->var_info,
 657             sizeof( struct fb_var_screeninfo ) );
 658
 659     /* Get some info on the framebuffer itself */
 660     if( !p_sys->b_auto )
 661     {
 662         p_sys->var_info.xres = p_sys->var_info.xres_virtual = p_sys->i_width;
 663         p_sys->var_info.yres = p_sys->var_info.yres_virtual = p_sys->i_height;
 664         p_vout->fmt_out.i_width = p_sys->i_width;
 665         p_vout->fmt_out.i_height = p_sys->i_height;
 666     }
 667
 668     /* Set some attributes */
 669     p_sys->var_info.activate = p_sys->b_tty
 670                                ? FB_ACTIVATE_NXTOPEN
 671                                : FB_ACTIVATE_NOW;
 672     p_sys->var_info.xoffset =  0;
 673     p_sys->var_info.yoffset =  0;
 674
 675     if( ioctl( p_sys->i_fd, FBIOPUT_VSCREENINFO, &p_sys->var_info ) )
 676     {
 677         msg_Err( p_vout, "cannot set fb info (%m)" );
 678         close( p_sys->i_fd );
 679         return VLC_EGENERIC;
 680     }
 681
 682     /* Get some information again, in the definitive configuration */
 683     if( ioctl( p_sys->i_fd, FBIOGET_FSCREENINFO, &fix_info )
 684          || ioctl( p_sys->i_fd, FBIOGET_VSCREENINFO, &p_sys->var_info ) )
 685     {
 686         msg_Err( p_vout, "cannot get additional fb info (%m)" );
 687
 688         /* Restore fb config */
 689         ioctl( p_sys->i_fd, FBIOPUT_VSCREENINFO, &p_sys->old_info );
 690
 691         close( p_sys->i_fd );
 692         return VLC_EGENERIC;
 693     }
 694
 695     /* If the fb has limitations on mode change,
 696      * then keep the resolution of the fb */
 697     if( (p_sys->i_height != p_sys->var_info.yres) ||
 698         (p_sys->i_width != p_sys->var_info.xres) )
 699     {
 700         p_sys->b_auto = VLC_TRUE;
 701         msg_Warn( p_vout,
 702                   "using framebuffer native resolution instead of requested (%ix%i)",
 703                   p_sys->i_width, p_sys->i_height );
 704     }
 705     p_sys->i_height = p_sys->var_info.yres;
 706     p_sys->i_width  = p_sys->var_info.xres_virtual
 707                                ? p_sys->var_info.xres_virtual
 708                                : p_sys->var_info.xres;
 709
 710     /* FIXME: if the image is full-size, it gets cropped on the left
 711      * because of the xres / xres_virtual slight difference */
 712     msg_Dbg( p_vout, "%ix%i (virtual %ix%i) (request %ix%i)",
 713              p_sys->var_info.xres, p_sys->var_info.yres,
 714              p_sys->var_info.xres_virtual,
 715              p_sys->var_info.yres_virtual,
 716              p_sys->i_width, p_sys->i_height );
 717
 718     p_sys->p_palette = NULL;
 719     p_sys->b_pan = ( fix_info.ypanstep || fix_info.ywrapstep );
 720
 721     switch( p_sys->var_info.bits_per_pixel )
 722     {
 723     case 8:
 724         p_sys->p_palette = malloc( 8 * 256 * sizeof( uint16_t ) );
 725         if( !p_sys->p_palette )
 726         {
 727             msg_Err( p_vout, "out of memory" );
 728
 729             /* Restore fb config */
 730             ioctl( p_sys->i_fd, FBIOPUT_VSCREENINFO, &p_sys->old_info );
 731
 732             close( p_sys->i_fd );
 733             return VLC_ENOMEM;
 734         }
 735         p_sys->fb_cmap.start = 0;
 736         p_sys->fb_cmap.len = 256;
 737         p_sys->fb_cmap.red = p_sys->p_palette;
 738         p_sys->fb_cmap.green = p_sys->p_palette + 256 * sizeof( uint16_t );
 739         p_sys->fb_cmap.blue = p_sys->p_palette + 2 * 256 * sizeof( uint16_t );
 740         p_sys->fb_cmap.transp = p_sys->p_palette + 3 * 256 * sizeof( uint16_t );
 741
 742         /* Save the colormap */
 743         ioctl( p_sys->i_fd, FBIOGETCMAP, &p_sys->fb_cmap );
 744
 745         p_sys->i_bytes_per_pixel = 1;
 746         break;
 747
 748     case 15:
 749     case 16:
 750         p_sys->i_bytes_per_pixel = 2;
 751         break;
 752
 753     case 24:
 754         p_sys->i_bytes_per_pixel = 3;
 755         break;
 756
 757     case 32:
 758         p_sys->i_bytes_per_pixel = 4;
 759         break;
 760
 761     default:
 762         msg_Err( p_vout, "screen depth %d is not supported",
 763                          p_sys->var_info.bits_per_pixel );
 764
 765         /* Restore fb config */
 766         ioctl( p_sys->i_fd, FBIOPUT_VSCREENINFO, &p_sys->old_info );
 767
 768         close( p_sys->i_fd );
 769         return VLC_EGENERIC;
 770     }
 771
 772     p_sys->i_page_size = p_sys->i_width * p_sys->i_height *
 773                          p_sys->i_bytes_per_pixel;
 774
 775     /* Map a framebuffer at the beginning */
 776     p_sys->p_video = mmap( 0, p_sys->i_page_size,
 777                               PROT_READ | PROT_WRITE, MAP_SHARED,
 778                               p_sys->i_fd, 0 );
 779
 780     if( p_sys->p_video == ((void*)-1) )
 781     {
 782         msg_Err( p_vout, "cannot map video memory (%m)" );
 783
 784         if( p_sys->var_info.bits_per_pixel == 8 )
 785         {
 786             free( p_sys->p_palette );
 787             p_sys->p_palette = NULL;
 788         }
 789
 790         /* Restore fb config */
 791         ioctl( p_sys->i_fd, FBIOPUT_VSCREENINFO, &p_vout->p_sys->old_info );
 792
 793         close( p_sys->i_fd );
 794         return VLC_EGENERIC;
 795     }
 796
 797     msg_Dbg( p_vout, "framebuffer type=%d, visual=%d, ypanstep=%d, "
 798              "ywrap=%d, accel=%d", fix_info.type, fix_info.visual,
 799              fix_info.ypanstep, fix_info.ywrapstep, fix_info.accel );
 800     return VLC_SUCCESS;
 801 }
 802
 803 /*****************************************************************************
 804  * CloseDisplay: terminate FB video thread output method
 805  *****************************************************************************/
 806 static void CloseDisplay( vout_thread_t *p_vout )
 807 {
 808     /* Clear display */
 809     memset( p_vout->p_sys->p_video, 0, p_vout->p_sys->i_page_size );
 810
 811     /* Restore palette */
 812     if( p_vout->p_sys->var_info.bits_per_pixel == 8 )
 813     {
 814         ioctl( p_vout->p_sys->i_fd,
 815                FBIOPUTCMAP, &p_vout->p_sys->fb_cmap );
 816         free( p_vout->p_sys->p_palette );
 817         p_vout->p_sys->p_palette = NULL;
 818     }
 819
 820     /* Restore fb config */
 821     ioctl( p_vout->p_sys->i_fd,
 822            FBIOPUT_VSCREENINFO, &p_vout->p_sys->old_info );
 823
 824     /* Close fb */
 825     close( p_vout->p_sys->i_fd );
 826 }
 827
 828 /*****************************************************************************
 829  * SwitchDisplay: VT change signal handler
 830  *****************************************************************************
 831  * This function activates or deactivates the output of the thread. It is
 832  * called by the VT driver, on terminal change.
 833  *****************************************************************************/
 834 static void SwitchDisplay(int i_signal)
 835 {
 836 #if 0
 837     vout_thread_t *p_vout;
 838
 839     vlc_mutex_lock( &p_vout_bank->lock );
 840
 841     /* XXX: only test the first video output */
 842     if( p_vout_bank->i_count )
 843     {
 844         p_vout = p_vout_bank->pp_vout[0];
 845
 846         switch( i_signal )
 847         {
 848         case SIGUSR1:                                /* vt has been released */
 849             p_vout->b_active = 0;
 850             ioctl( p_sys->i_tty, VT_RELDISP, 1 );
 851             break;
 852         case SIGUSR2:                                /* vt has been acquired */
 853             p_vout->b_active = 1;
 854             ioctl( p_sys->i_tty, VT_RELDISP, VT_ACTIVATE );
 855             /* handle blanking */
 856             vlc_mutex_lock( &p_vout->change_lock );
 857             p_vout->i_changes |= VOUT_SIZE_CHANGE;
 858             vlc_mutex_unlock( &p_vout->change_lock );
 859             break;
 860         }
 861     }
 862
 863     vlc_mutex_unlock( &p_vout_bank->lock );
 864 #endif
 865 }
 866
 867 /*****************************************************************************
 868  * TextMode and GfxMode : switch tty to text/graphic mode
 869  *****************************************************************************
 870  * These functions toggle the tty mode.
 871  *****************************************************************************/
 872 static void TextMode( int i_tty )
 873 {
 874     /* return to text mode */
 875     if( -1 == ioctl(i_tty, KDSETMODE, KD_TEXT) )
 876     {
 877         /*msg_Err( p_vout, "failed ioctl KDSETMODE KD_TEXT" );*/
 878     }
 879 }
 880
 881 static void GfxMode( int i_tty )
 882 {
 883     /* switch to graphic mode */
 884     if( -1 == ioctl(i_tty, KDSETMODE, KD_GRAPHICS) )
 885     {
 886         /*msg_Err( p_vout, "failed ioctl KDSETMODE KD_GRAPHICS" );*/
 887     }
 888 }