git.sesse.net Git - vlc/blob - modules/access/dc1394.c

   1 /*****************************************************************************
   2  * dc1394.c: IIDC (DCAM) FireWire input module
   3  *****************************************************************************
   4  * Copyright (C) 2006-2009 VideoLAN
   5  *
   6  * Authors: Xant Majere <xant@xant.net>
   7  *          Rob Shortt <rob@tvcentric.com> - libdc1394 V2 API updates
   8  *          Frederic Benoist <fridorik@gmail.com> - updates from Rob's work
   9  *
  10  *****************************************************************************
  11  *
  12  * This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the GNU Lesser General Public License as published by
  14  * the Free Software Foundation; either version 2.1 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  20  * GNU Lesser General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU Lesser General Public License
  23  * along with this program; if not, write to the Free Software Foundation,
  24  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  25  *****************************************************************************/
  26
  27 /*****************************************************************************
  28  * Preamble
  29  *****************************************************************************/
  30
  31 #ifdef HAVE_CONFIG_H
  32 # include "config.h"
  33 #endif
  34
  35 #include <vlc_common.h>
  36 #include <vlc_plugin.h>
  37 #include <vlc_demux.h>
  38
  39 #include <dc1394/dc1394.h>
  40
  41 #define MAX_IEEE1394_HOSTS 32
  42 #define MAX_CAMERA_NODES 32
  43
  44 /*****************************************************************************
  45  * Module descriptor
  46  *****************************************************************************/
  47 static int  Open ( vlc_object_t * );
  48 static void Close( vlc_object_t * );
  49
  50 vlc_module_begin()
  51     set_shortname( N_("DC1394") )
  52     set_description( N_("IIDC Digital Camera (FireWire) input") )
  53     set_capability( "access_demux", 10 )
  54     set_callbacks( Open, Close )
  55 vlc_module_end()
  56
  57 struct demux_sys_t
  58 {
  59     /* camera info */
  60     dc1394_t            *p_dccontext;
  61     uint32_t            num_cameras;
  62     dc1394camera_t      *camera;
  63     int                 selected_camera;
  64     uint64_t            selected_uid;
  65     uint32_t            dma_buffers;
  66     dc1394featureset_t  features;
  67     bool                reset_bus;
  68
  69     /* video info */
  70     char                *video_device;
  71     dc1394video_mode_t  video_mode;
  72     int                 width;
  73     int                 height;
  74     int                 frame_size;
  75     int                 frame_rate;
  76     unsigned int        brightness;
  77     unsigned int        focus;
  78     es_out_id_t         *p_es_video;
  79     dc1394video_frame_t *frame;
  80 };
  81
  82 /*****************************************************************************
  83  * Local prototypes
  84  *****************************************************************************/
  85 static int Demux( demux_t *p_demux );
  86 static int Control( demux_t *, int, va_list );
  87 static block_t *GrabVideo( demux_t *p_demux );
  88 static int process_options( demux_t *p_demux);
  89
  90 /*****************************************************************************
  91  * FindCameras
  92  *****************************************************************************/
  93 static int FindCamera( demux_sys_t *sys, demux_t *p_demux )
  94 {
  95     dc1394camera_list_t *list;
  96     int i_ret = VLC_EGENERIC;
  97
  98     msg_Dbg( p_demux, "Scanning for ieee1394 ports ..." );
  99
 100     if( dc1394_camera_enumerate (sys->p_dccontext, &list) != DC1394_SUCCESS )
 101     {
 102         msg_Err(p_demux, "Can not ennumerate cameras");
 103         goto end;
 104     }
 105
 106     if( list->num == 0 )
 107     {
 108         msg_Err(p_demux, "Can not find cameras");
 109         goto end;
 110     }
 111
 112     sys->num_cameras = list->num;
 113     msg_Dbg( p_demux, "Found %d dc1394 cameras.", list->num);
 114
 115     if( sys->selected_uid )
 116     {
 117         int found = 0;
 118         for( unsigned i = 0; i < sys->num_cameras; i++ )
 119         {
 120             if( list->ids[i].guid == sys->selected_uid )
 121             {
 122                 sys->camera = dc1394_camera_new(sys->p_dccontext,
 123                                                 list->ids[i].guid);
 124                 found++;
 125                 break;
 126             }
 127         }
 128         if( !found )
 129         {
 130             msg_Err( p_demux, "Can't find camera with uid : 0x%"PRIx64".",
 131                      sys->selected_uid );
 132             goto end;
 133         }
 134     }
 135     else if( sys->selected_camera >= (int)list->num )
 136     {
 137         msg_Err( p_demux, "There are not this many cameras. (%d/%d)",
 138                  sys->selected_camera, sys->num_cameras );
 139         goto end;
 140     }
 141     else if( sys->selected_camera >= 0 )
 142     {
 143         sys->camera = dc1394_camera_new(sys->p_dccontext,
 144                     list->ids[sys->selected_camera].guid);
 145     }
 146     else
 147     {
 148         sys->camera = dc1394_camera_new(sys->p_dccontext,
 149                                           list->ids[0].guid);
 150     }
 151
 152     i_ret = VLC_SUCCESS;
 153
 154 end:
 155     dc1394_camera_free_list (list);
 156     return i_ret;
 157 }
 158
 159 /*****************************************************************************
 160  * Open:
 161  *****************************************************************************/
 162 static int Open( vlc_object_t *p_this )
 163 {
 164     demux_t      *p_demux = (demux_t*)p_this;
 165     demux_sys_t  *p_sys;
 166     es_format_t   fmt;
 167     dc1394error_t res;
 168
 169     if( strncmp(p_demux->psz_access, "dc1394", 6) != 0 )
 170         return VLC_EGENERIC;
 171
 172     /* Set up p_demux */
 173     p_demux->pf_demux = Demux;
 174     p_demux->pf_control = Control;
 175     p_demux->info.i_update = 0;
 176     p_demux->info.i_title = 0;
 177     p_demux->info.i_seekpoint = 0;
 178
 179     p_demux->p_sys = p_sys = calloc( 1, sizeof( demux_sys_t ) );
 180     if( !p_sys )
 181         return VLC_ENOMEM;
 182
 183     memset( &fmt, 0, sizeof( es_format_t ) );
 184
 185     /* DEFAULTS */
 186     p_sys->video_mode      = DC1394_VIDEO_MODE_640x480_YUV422;
 187     p_sys->width           = 640;
 188     p_sys->height          = 480;
 189     p_sys->frame_rate      = DC1394_FRAMERATE_15;
 190     p_sys->brightness      = 200;
 191     p_sys->focus           = 0;
 192     p_sys->p_dccontext     = NULL;
 193     p_sys->camera          = NULL;
 194     p_sys->selected_camera = -1;
 195     p_sys->dma_buffers     = 1;
 196     p_sys->reset_bus       = 0;
 197
 198     /* PROCESS INPUT OPTIONS */
 199     if( process_options(p_demux) != VLC_SUCCESS )
 200     {
 201         msg_Err( p_demux, "Bad MRL, please check the option line "
 202                           "(MRL was: %s)",
 203                           p_demux->psz_location );
 204         free( p_sys );
 205         return VLC_EGENERIC;
 206     }
 207
 208     p_sys->p_dccontext = dc1394_new();
 209     if( !p_sys->p_dccontext )
 210     {
 211         msg_Err( p_demux, "Failed to initialise libdc1394");
 212         free( p_sys );
 213         return VLC_EGENERIC;
 214     }
 215
 216     if( FindCamera( p_sys, p_demux ) != VLC_SUCCESS )
 217     {
 218         dc1394_free( p_sys->p_dccontext );
 219         free( p_sys );
 220         return VLC_EGENERIC;
 221     }
 222
 223     if( !p_sys->camera )
 224     {
 225         msg_Err( p_demux, "No camera found !!" );
 226         dc1394_free( p_sys->p_dccontext );
 227         free( p_sys );
 228         return VLC_EGENERIC;
 229     }
 230
 231     if( p_sys->reset_bus )
 232     {
 233         if( dc1394_reset_bus( p_sys->camera ) != DC1394_SUCCESS )
 234         {
 235             msg_Err( p_demux, "Unable to reset IEEE 1394 bus");
 236             Close( p_this );
 237             return VLC_EGENERIC;
 238         }
 239         else msg_Dbg( p_demux, "Successfully reset IEEE 1394 bus");
 240     }
 241
 242     if( dc1394_camera_reset( p_sys->camera ) != DC1394_SUCCESS )
 243     {
 244         msg_Err( p_demux, "Unable to reset camera");
 245         Close( p_this );
 246         return VLC_EGENERIC;
 247     }
 248
 249     if( dc1394_camera_print_info( p_sys->camera,
 250                   stderr ) != DC1394_SUCCESS )
 251     {
 252         msg_Err( p_demux, "Unable to print camera info");
 253         Close( p_this );
 254         return VLC_EGENERIC;
 255     }
 256
 257     if( dc1394_feature_get_all( p_sys->camera,
 258                 &p_sys->features ) != DC1394_SUCCESS )
 259     {
 260         msg_Err( p_demux, "Unable to get feature set");
 261         Close( p_this );
 262         return VLC_EGENERIC;
 263     }
 264     // TODO: only print features if verbosity increased
 265     dc1394_feature_print_all(&p_sys->features, stderr);
 266
 267 #if 0 //"Note that you need to execute this function only if you use exotic video1394 device names. /dev/video1394, /dev/video1394/* and /dev/video1394-* are automatically recognized." http://damien.douxchamps.net/ieee1394/libdc1394/v2.x/api/capture/
 268     if( p_sys->video_device )
 269     {
 270         if( dc1394_capture_set_device_filename( p_sys->camera,
 271                         p_sys->video_device ) != DC1394_SUCCESS )
 272         {
 273             msg_Err( p_demux, "Unable to set video device");
 274             Close( p_this );
 275             return VLC_EGENERIC;
 276         }
 277     }
 278 #endif
 279
 280     if( p_sys->focus )
 281     {
 282         if( dc1394_feature_set_value( p_sys->camera,
 283                       DC1394_FEATURE_FOCUS,
 284                       p_sys->focus ) != DC1394_SUCCESS )
 285         {
 286             msg_Err( p_demux, "Unable to set initial focus to %u",
 287                      p_sys->focus );
 288         }
 289         else
 290             msg_Dbg( p_demux, "Initial focus set to %u", p_sys->focus );
 291     }
 292
 293     if( dc1394_feature_set_value( p_sys->camera,
 294                   DC1394_FEATURE_FOCUS,
 295                   p_sys->brightness ) != DC1394_SUCCESS )
 296     {
 297         msg_Err( p_demux, "Unable to set initial brightness to %u",
 298                  p_sys->brightness );
 299     }
 300     else
 301         msg_Dbg( p_demux, "Initial brightness set to %u", p_sys->brightness );
 302
 303     if( dc1394_video_set_framerate( p_sys->camera,
 304                     p_sys->frame_rate ) != DC1394_SUCCESS )
 305     {
 306         msg_Err( p_demux, "Unable to set framerate");
 307         Close( p_this );
 308         return VLC_EGENERIC;
 309     }
 310
 311     if( dc1394_video_set_mode( p_sys->camera,
 312                    p_sys->video_mode ) != DC1394_SUCCESS )
 313     {
 314         msg_Err( p_demux, "Unable to set video mode");
 315         Close( p_this );
 316         return VLC_EGENERIC;
 317     }
 318
 319     if( dc1394_video_set_iso_speed( p_sys->camera,
 320                     DC1394_ISO_SPEED_400 ) != DC1394_SUCCESS )
 321     {
 322         msg_Err( p_demux, "Unable to set iso speed");
 323         Close( p_this );
 324         return VLC_EGENERIC;
 325     }
 326
 327     /* and setup capture */
 328     res = dc1394_capture_setup( p_sys->camera,
 329                     p_sys->dma_buffers,
 330                 DC1394_CAPTURE_FLAGS_DEFAULT);
 331     if( res != DC1394_SUCCESS )
 332     {
 333         if( res == DC1394_NO_BANDWIDTH )
 334         {
 335             msg_Err( p_demux ,"No bandwidth: try adding the "
 336              "\"resetbus\" option" );
 337         }
 338         else
 339         {
 340             msg_Err( p_demux ,"Unable to setup capture" );
 341         }
 342         Close( p_this );
 343         return VLC_EGENERIC;
 344     }
 345
 346     /* TODO - UYV444 chroma converter is missing, when it will be available
 347      * fourcc will become variable (and not just a fixed value for UYVY)
 348      */
 349     es_format_Init( &fmt, VIDEO_ES, VLC_CODEC_UYVY );
 350
 351     fmt.video.i_width = p_sys->width;
 352     fmt.video.i_height = p_sys->height;
 353
 354     msg_Dbg( p_demux, "Added new video es %4.4s %dx%d",
 355              (char*)&fmt.i_codec, fmt.video.i_width, fmt.video.i_height );
 356
 357     p_sys->p_es_video = es_out_Add( p_demux->out, &fmt );
 358
 359     /* have the camera start sending us data */
 360     if( dc1394_video_set_transmission( p_sys->camera,
 361                        DC1394_ON ) != DC1394_SUCCESS )
 362     {
 363         msg_Err( p_demux, "Unable to start camera iso transmission" );
 364         dc1394_capture_stop( p_sys->camera );
 365         Close( p_this );
 366         return VLC_EGENERIC;
 367     }
 368     msg_Dbg( p_demux, "Set iso transmission" );
 369     // TODO: reread camera
 370     return VLC_SUCCESS;
 371 }
 372
 373 /*****************************************************************************
 374  * Close:
 375  *****************************************************************************/
 376 static void Close( vlc_object_t *p_this )
 377 {
 378     demux_t     *p_demux = (demux_t*)p_this;
 379     demux_sys_t *p_sys = p_demux->p_sys;
 380
 381     /* Stop data transmission */
 382     if( dc1394_video_set_transmission( p_sys->camera,
 383                        DC1394_OFF ) != DC1394_SUCCESS )
 384         msg_Err( p_demux, "Unable to stop camera iso transmission" );
 385
 386     /* Close camera */
 387     dc1394_capture_stop( p_sys->camera );
 388
 389     dc1394_camera_free(p_sys->camera);
 390     dc1394_free(p_sys->p_dccontext);
 391
 392     free( p_sys->video_device );
 393     free( p_sys );
 394 }
 395
 396 #if 0
 397 static void MovePixelUYVY( void *src, int spos, void *dst, int dpos )
 398 {
 399     char u,v,y;
 400     u_char  *sc;
 401     u_char  *dc;
 402
 403     sc = (u_char *)src + (spos*2);
 404     if( spos % 2 )
 405     {
 406         v = sc[0];
 407         y = sc[1];
 408         u = *(sc -2);
 409     }
 410     else
 411     {
 412         u = sc[0];
 413         y = sc[1];
 414         v = sc[2];
 415     }
 416     dc = (u_char *)dst+(dpos*2);
 417     if( dpos % 2 )
 418     {
 419         dc[0] = v;
 420         dc[1] = y;
 421     }
 422     else
 423     {
 424         dc[0] = u;
 425         dc[1] = y;
 426     }
 427 }
 428 #endif
 429
 430 /*****************************************************************************
 431  * Demux:
 432  *****************************************************************************/
 433 static block_t *GrabVideo( demux_t *p_demux )
 434 {
 435     demux_sys_t *p_sys = p_demux->p_sys;
 436     block_t     *p_block = NULL;
 437
 438     if( dc1394_capture_dequeue( p_sys->camera,
 439                 DC1394_CAPTURE_POLICY_WAIT,
 440                 &p_sys->frame ) != DC1394_SUCCESS )
 441     {
 442         msg_Err( p_demux, "Unable to capture a frame" );
 443         return NULL;
 444     }
 445
 446     p_block = block_Alloc( p_sys->frame->size[0] * p_sys->frame->size[1] * 2 );
 447     if( !p_block )
 448     {
 449         msg_Err( p_demux, "Can not get block" );
 450         return NULL;
 451     }
 452
 453     if( !p_sys->frame->image )
 454     {
 455         msg_Err (p_demux, "Capture buffer empty");
 456         block_Release( p_block );
 457         return NULL;
 458     }
 459
 460     memcpy( p_block->p_buffer, (const char *)p_sys->frame->image,
 461             p_sys->width * p_sys->height * 2 );
 462
 463     p_block->i_pts = p_block->i_dts = mdate();
 464     dc1394_capture_enqueue( p_sys->camera, p_sys->frame );
 465     return p_block;
 466 }
 467
 468 static int Demux( demux_t *p_demux )
 469 {
 470     demux_sys_t *p_sys = p_demux->p_sys;
 471     block_t *p_blockv = NULL;
 472
 473     /* Try grabbing video frame */
 474     p_blockv = GrabVideo( p_demux );
 475
 476     if( !p_blockv )
 477     {
 478         /* Sleep so we do not consume all the cpu, 10ms seems
 479          * like a good value (100fps)
 480          */
 481         msleep( 10000 );
 482         return 1;
 483     }
 484
 485     if( p_blockv )
 486     {
 487         es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_blockv->i_pts );
 488         es_out_Send( p_demux->out, p_sys->p_es_video, p_blockv );
 489     }
 490     return 1;
 491 }
 492
 493 /*****************************************************************************
 494  * Control:
 495  *****************************************************************************/
 496 static int Control( demux_t *p_demux, int i_query, va_list args )
 497 {
 498     VLC_UNUSED( p_demux );
 499     switch( i_query )
 500     {
 501         /* Special for access_demux */
 502         case DEMUX_CAN_PAUSE:
 503         case DEMUX_CAN_SEEK:
 504         case DEMUX_SET_PAUSE_STATE:
 505         case DEMUX_CAN_CONTROL_PACE:
 506             *va_arg( args, bool * ) = false;
 507             return VLC_SUCCESS;
 508
 509         case DEMUX_GET_PTS_DELAY:
 510             *va_arg( args, int64_t * ) = (int64_t)DEFAULT_PTS_DELAY;
 511             return VLC_SUCCESS;
 512
 513         case DEMUX_GET_TIME:
 514             *va_arg( args, int64_t * ) = mdate();
 515             return VLC_SUCCESS;
 516
 517         /* TODO implement others */
 518         default:
 519             return VLC_EGENERIC;
 520     }
 521     return VLC_EGENERIC;
 522 }
 523
 524 static int process_options( demux_t *p_demux )
 525 {
 526     demux_sys_t *p_sys = p_demux->p_sys;
 527     char *psz_dup;
 528     char *psz_parser;
 529     char *token = NULL;
 530     char *state = NULL;
 531     const char *in_size = NULL;
 532     const char *in_fmt = NULL;
 533     float rate_f;
 534
 535     psz_dup = strdup( p_demux->psz_location );
 536     psz_parser = psz_dup;
 537     for( token = strtok_r( psz_parser,":",&state); token;
 538          token = strtok_r( NULL, ":", &state ) )
 539     {
 540         if( strncmp( token, "size=", strlen("size=") ) == 0 )
 541         {
 542             token += strlen("size=");
 543             if( strncmp( token, "160x120", 7 ) == 0 )
 544             {
 545                 /* TODO - UYV444 chroma converter is needed ...
 546                     * video size of 160x120 is temporarily disabled
 547                     */
 548                 msg_Err( p_demux,
 549                     "video size of 160x120 is actually disabled for lack of"
 550                     "chroma support. It will relased ASAP, until then try "
 551                     "an higher size (320x240 and 640x480 are fully supported)" );
 552                 free(psz_dup);
 553                 return VLC_EGENERIC;
 554 #if 0
 555                 in_size = "160x120";
 556                 p_sys->width = 160;
 557                 p_sys->height = 120;
 558 #endif
 559             }
 560             else if( strncmp( token, "320x240", 7 ) == 0 )
 561             {
 562                 in_size = "320x240";
 563                 p_sys->width = 320;
 564                 p_sys->height = 240;
 565             }
 566             else if( strncmp( token, "640x480", 7 ) == 0 )
 567             {
 568                 in_size = "640x480";
 569                 p_sys->width = 640;
 570                 p_sys->height = 480;
 571             }
 572             else
 573             {
 574                 msg_Err( p_demux,
 575                     "This program currently suppots frame sizes of"
 576                     " 160x120, 320x240, and 640x480. "
 577                     "Please specify one of them. You have specified %s.",
 578                     token );
 579                 free(psz_dup);
 580                 return VLC_EGENERIC;
 581             }
 582             msg_Dbg( p_demux, "Requested video size : %s",token );
 583         }
 584         if( strncmp( token, "format=", strlen("format=") ) == 0 )
 585         {
 586             token += strlen("format=");
 587             if( strncmp( token, "YUV411", 6 ) == 0 )
 588             {
 589                 in_fmt = "YUV411";
 590             }
 591             else if( strncmp( token, "YUV422", 6 ) == 0 )
 592             {
 593                 in_fmt = "YUV422";
 594             }
 595             else if( strncmp( token, "YUV444", 6 ) == 0 )
 596             {
 597                 in_fmt = "YUV444";
 598             }
 599             else if( strncmp( token, "RGB8", 4 ) == 0 )
 600             {
 601                 in_fmt = "RGB8";
 602             }
 603             else if( strncmp( token, "MONO8", 5 ) == 0 )
 604             {
 605                 in_fmt = "MONO8";
 606             }
 607             else if( strncmp( token, "MONO16", 6 ) == 0 )
 608             {
 609                 in_fmt = "MONO16";
 610             }
 611             else
 612             {
 613                 msg_Err( p_demux, "Invalid format %s.", token );
 614                 free(psz_dup);
 615                 return VLC_EGENERIC;
 616             }
 617             msg_Dbg( p_demux, "Requested video format : %s", token );
 618         }
 619         else if( strncmp( token, "fps=", strlen( "fps=" ) ) == 0 )
 620         {
 621             token += strlen("fps=");
 622             sscanf( token, "%g", &rate_f );
 623             if( rate_f == 1.875 )
 624                 p_sys->frame_rate = DC1394_FRAMERATE_1_875;
 625             else if( rate_f == 3.75 )
 626                 p_sys->frame_rate = DC1394_FRAMERATE_3_75;
 627             else if( rate_f == 7.5 )
 628                 p_sys->frame_rate = DC1394_FRAMERATE_7_5;
 629             else if( rate_f == 15 )
 630                 p_sys->frame_rate = DC1394_FRAMERATE_15;
 631             else if( rate_f == 30 )
 632                 p_sys->frame_rate = DC1394_FRAMERATE_30;
 633             else if( rate_f == 60 )
 634                 p_sys->frame_rate = DC1394_FRAMERATE_60;
 635             else
 636             {
 637                 msg_Err( p_demux ,
 638                     "This program supports framerates of"
 639                     " 1.875, 3.75, 7.5, 15, 30, 60. "
 640                     "Please specify one of them. You have specified %s.",
 641                     token);
 642                 free(psz_dup);
 643                 return VLC_EGENERIC;
 644             }
 645             msg_Dbg( p_demux, "Requested frame rate : %s",token );
 646         }
 647         else if( strncmp( token, "resetbus", strlen( "resetbus" ) ) == 0 )
 648         {
 649             token += strlen("resetbus");
 650             p_sys->reset_bus = 1;
 651         }
 652         else if( strncmp( token, "brightness=", strlen( "brightness=" ) ) == 0 )
 653         {
 654             int nr = 0;
 655             token += strlen("brightness=");
 656             nr = sscanf( token, "%u", &p_sys->brightness);
 657             if( nr != 1 )
 658             {
 659                 msg_Err( p_demux, "Bad brightness value '%s', "
 660                                   "must be an unsigned integer.",
 661                                   token );
 662                 free(psz_dup);
 663                 return VLC_EGENERIC;
 664             }
 665         }
 666         else if( strncmp( token, "buffers=", strlen( "buffers=" ) ) == 0 )
 667         {
 668             int nr = 0;
 669             int in_buf = 0;
 670             token += strlen("buffers=");
 671             nr = sscanf( token, "%d", &in_buf);
 672             if( nr != 1 || in_buf < 1 )
 673             {
 674                 msg_Err( p_demux, "DMA buffers must be 1 or greater." );
 675                 free(psz_dup);
 676                 return VLC_EGENERIC;
 677             }
 678             else p_sys->dma_buffers = in_buf;
 679         }
 680 #if 0
 681         // NOTE: If controller support is added back, more logic will needed to be added
 682         //       after the cameras are scanned.
 683         else if( strncmp( token, "controller=", strlen( "controller=" ) ) == 0 )
 684         {
 685             int nr = 0;
 686             token += strlen("controller=");
 687             nr = sscanf( token, "%u", &p_sys->controller );
 688             if( nr != 1)
 689             {
 690                 msg_Err(p_demux, "Bad controller value '%s', "
 691                                  "must be an unsigned integer.",
 692                                  token );
 693                 return VLC_EGENERIC;
 694             }
 695         }
 696 #endif
 697         else if( strncmp( token, "camera=", strlen( "camera=" ) ) == 0 )
 698         {
 699             int nr = 0;
 700             token += strlen("camera=");
 701             nr = sscanf(token,"%u",&p_sys->selected_camera);
 702             if( nr != 1)
 703             {
 704                 msg_Err( p_demux, "Bad camera number '%s', "
 705                                   "must be an unsigned integer.",
 706                                   token );
 707                 free(psz_dup);
 708                 return VLC_EGENERIC;
 709             }
 710         }
 711         else if( strncmp( token, "vdev=", strlen( "vdev=" ) ) == 0)
 712         {
 713             token += strlen("vdev=");
 714             p_sys->video_device = strdup(token);
 715             msg_Dbg( p_demux, "Using video device '%s'.", token );
 716         }
 717         else if( strncmp( token, "focus=", strlen("focus=" ) ) == 0)
 718         {
 719             int nr = 0;
 720             token += strlen("focus=");
 721             nr = sscanf( token, "%u", &p_sys->focus );
 722             if( nr != 1 )
 723             {
 724                 msg_Err( p_demux, "Bad focus value '%s', "
 725                                   "must be an unsigned integer.",
 726                                   token );
 727                 free(psz_dup);
 728                 return VLC_EGENERIC;
 729             }
 730         }
 731         else if( strncmp( token, "uid=", strlen("uid=") ) == 0)
 732         {
 733             token += strlen("uid=");
 734             sscanf( token, "0x%"SCNx64, &p_sys->selected_uid );
 735         }
 736     }
 737
 738     // The mode is a combination of size and format and not every format
 739     // is supported by every size.
 740     if( in_size)
 741     {
 742         if( strcmp( in_size, "160x120") == 0)
 743         {
 744             if( in_fmt && (strcmp( in_fmt, "YUV444") != 0) )
 745                 msg_Err(p_demux, "160x120 only supports YUV444 - forcing");
 746             p_sys->video_mode = DC1394_VIDEO_MODE_160x120_YUV444;
 747         }
 748         else if( strcmp( in_size, "320x240") == 0)
 749         {
 750             if( in_fmt && (strcmp( in_fmt, "YUV422") != 0) )
 751                 msg_Err(p_demux, "320x240 only supports YUV422 - forcing");
 752             p_sys->video_mode = DC1394_VIDEO_MODE_320x240_YUV422;
 753         }
 754     }
 755     else
 756     { // 640x480 default
 757         if( in_fmt )
 758         {
 759             if( strcmp( in_fmt, "RGB8") == 0)
 760                 p_sys->video_mode = DC1394_VIDEO_MODE_640x480_RGB8;
 761             else if( strcmp( in_fmt, "MONO8") == 0)
 762                 p_sys->video_mode = DC1394_VIDEO_MODE_640x480_MONO8;
 763             else if( strcmp( in_fmt, "MONO16") == 0)
 764                 p_sys->video_mode = DC1394_VIDEO_MODE_640x480_MONO16;
 765             else if( strcmp( in_fmt, "YUV411") == 0)
 766                 p_sys->video_mode = DC1394_VIDEO_MODE_640x480_YUV411;
 767             else // YUV422 default
 768                 p_sys->video_mode = DC1394_VIDEO_MODE_640x480_YUV422;
 769         }
 770         else // YUV422 default
 771             p_sys->video_mode = DC1394_VIDEO_MODE_640x480_YUV422;
 772     }
 773
 774     free( psz_dup );
 775     return VLC_SUCCESS;
 776 }