git.sesse.net Git - vlc/blob - modules/access/v4l.c

   1 /*****************************************************************************
   2  * v4l.c : Video4Linux input module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2002-2004 the VideoLAN team
   5  * $Id$
   6  *
   7  * Author: Laurent Aimar <fenrir@via.ecp.fr>
   8  *         Paul Forgey <paulf at aphrodite dot com>
   9  *         Gildas Bazin <gbazin@videolan.org>
  10  *         Benjamin Pracht <bigben at videolan dot org>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 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 General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, 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_input.h>
  38 #include <vlc_demux.h>
  39 #include <vlc_access.h>
  40 #include <vlc_picture.h>
  41
  42 #include <sys/ioctl.h>
  43 #include <sys/mman.h>
  44 #include <fcntl.h>
  45 #include <arpa/inet.h>
  46
  47 /* From GStreamer's v4l plugin:
  48  * Because of some really cool feature in video4linux1, also known as
  49  * 'not including sys/types.h and sys/time.h', we had to include it
  50  * ourselves. In all their intelligence, these people decided to fix
  51  * this in the next version (video4linux2) in such a cool way that it
  52  * breaks all compilations of old stuff...
  53  * The real problem is actually that linux/time.h doesn't use proper
  54  * macro checks before defining types like struct timeval. The proper
  55  * fix here is to either fuck the kernel header (which is what we do
  56  * by defining _LINUX_TIME_H, an innocent little hack) or by fixing it
  57  * upstream, which I'll consider doing later on. If you get compiler
  58  * errors here, check your linux/time.h && sys/time.h header setup.
  59 */
  60 #define _LINUX_TIME_H
  61
  62 #include <linux/videodev.h>
  63 #include "videodev_mjpeg.h"
  64
  65 /*****************************************************************************
  66  * Module descriptior
  67  *****************************************************************************/
  68 static int  Open ( vlc_object_t * );
  69 static void Close( vlc_object_t * );
  70
  71 #define CACHING_TEXT N_("Caching value in ms")
  72 #define CACHING_LONGTEXT N_( \
  73     "Caching value for V4L captures. This " \
  74     "value should be set in milliseconds." )
  75 #define VDEV_TEXT N_("Video device name")
  76 #define VDEV_LONGTEXT N_( \
  77     "Name of the video device to use. " \
  78     "If you don't specify anything, no video device will be used.")
  79 #define CHROMA_TEXT N_("Video input chroma format")
  80 #define CHROMA_LONGTEXT N_( \
  81     "Force the Video4Linux video device to use a specific chroma format " \
  82     "(eg. I420 (default), RV24, etc.)")
  83 #define FREQUENCY_TEXT N_( "Frequency" )
  84 #define FREQUENCY_LONGTEXT N_( \
  85     "Frequency to capture (in kHz), if applicable." )
  86 #define CHANNEL_TEXT N_( "Channel" )
  87 #define CHANNEL_LONGTEXT N_( \
  88     "Channel of the card to use (Usually, 0 = tuner, " \
  89     "1 = composite, 2 = svideo)." )
  90 #define NORM_TEXT N_( "Norm" )
  91 #define NORM_LONGTEXT N_( \
  92     "Norm of the stream (Automatic, SECAM, PAL, or NTSC)." )
  93 #define AUDIO_TEXT N_( "Audio Channel" )
  94 #define AUDIO_LONGTEXT N_( \
  95     "Audio Channel to use, if there are several audio inputs." )
  96 #define WIDTH_TEXT N_( "Width" )
  97 #define WIDTH_LONGTEXT N_( "Width of the stream to capture " \
  98     "(-1 for autodetect)." )
  99 #define HEIGHT_TEXT N_( "Height" )
 100 #define HEIGHT_LONGTEXT N_( "Height of the stream to capture " \
 101     "(-1 for autodetect)." )
 102 #define BRIGHTNESS_TEXT N_( "Brightness" )
 103 #define BRIGHTNESS_LONGTEXT N_( \
 104     "Brightness of the video input." )
 105 #define HUE_TEXT N_( "Hue" )
 106 #define HUE_LONGTEXT N_( \
 107     "Hue of the video input." )
 108 #define COLOUR_TEXT N_( "Color" )
 109 #define COLOUR_LONGTEXT N_( \
 110     "Color of the video input." )
 111 #define CONTRAST_TEXT N_( "Contrast" )
 112 #define CONTRAST_LONGTEXT N_( \
 113     "Contrast of the video input." )
 114 #define TUNER_TEXT N_( "Tuner" )
 115 #define TUNER_LONGTEXT N_( "Tuner to use, if there are several ones." )
 116 #define MJPEG_TEXT N_( "MJPEG" )
 117 #define MJPEG_LONGTEXT N_(  \
 118     "Set this option if the capture device outputs MJPEG" )
 119 #define DECIMATION_TEXT N_( "Decimation" )
 120 #define DECIMATION_LONGTEXT N_( \
 121     "Decimation level for MJPEG streams" )
 122 #define QUALITY_TEXT N_( "Quality" )
 123 #define QUALITY_LONGTEXT N_( "Quality of the stream." )
 124 #define FPS_TEXT N_( "Framerate" )
 125 #define FPS_LONGTEXT N_( "Framerate to capture, if applicable " \
 126     "(-1 for autodetect)." )
 127
 128 #define AUDIO_DEPRECATED_ERROR N_( \
 129     "Alsa or OSS audio capture in the v4l access is deprecated. " \
 130     "please use 'v4l:/""/ :input-slave=alsa:/""/' or " \
 131     "'v4l:/""/ :input-slave=oss:/""/' instead." )
 132
 133 static const int i_norm_list[] =
 134     { VIDEO_MODE_AUTO, VIDEO_MODE_SECAM, VIDEO_MODE_PAL, VIDEO_MODE_NTSC };
 135 static const char *const psz_norm_list_text[] =
 136     { N_("Automatic"), N_("SECAM"), N_("PAL"),  N_("NTSC") };
 137
 138 #define V4L_DEFAULT "/dev/video"
 139
 140 vlc_module_begin ()
 141     set_shortname( N_("Video4Linux") )
 142     set_description( N_("Video4Linux input") )
 143     set_category( CAT_INPUT )
 144     set_subcategory( SUBCAT_INPUT_ACCESS )
 145
 146     add_integer( "v4l-caching", DEFAULT_PTS_DELAY / 1000, NULL,
 147                  CACHING_TEXT, CACHING_LONGTEXT, true )
 148     add_obsolete_string( "v4l-vdev" );
 149     add_obsolete_string( "v4l-adev" );
 150     add_string( "v4l-chroma", NULL, NULL, CHROMA_TEXT, CHROMA_LONGTEXT,
 151                 true )
 152     add_float( "v4l-fps", -1.0, NULL, FPS_TEXT, FPS_LONGTEXT, true )
 153     add_obsolete_integer( "v4l-samplerate" );
 154     add_integer( "v4l-channel", 0, NULL, CHANNEL_TEXT, CHANNEL_LONGTEXT,
 155                 true )
 156     add_integer( "v4l-tuner", -1, NULL, TUNER_TEXT, TUNER_LONGTEXT, true )
 157     add_integer( "v4l-norm", VIDEO_MODE_AUTO, NULL, NORM_TEXT, NORM_LONGTEXT,
 158                 false )
 159         change_integer_list( i_norm_list, psz_norm_list_text, NULL );
 160     add_integer( "v4l-frequency", -1, NULL, FREQUENCY_TEXT, FREQUENCY_LONGTEXT,
 161                 false )
 162     add_integer( "v4l-audio", -1, NULL, AUDIO_TEXT, AUDIO_LONGTEXT, true )
 163     add_obsolete_bool( "v4l-stereo" );
 164     add_integer( "v4l-width", 0, NULL, WIDTH_TEXT, WIDTH_LONGTEXT, true )
 165     add_integer( "v4l-height", 0, NULL, HEIGHT_TEXT, HEIGHT_LONGTEXT,
 166                 true )
 167     add_integer( "v4l-brightness", -1, NULL, BRIGHTNESS_TEXT,
 168                 BRIGHTNESS_LONGTEXT, true )
 169     add_integer( "v4l-colour", -1, NULL, COLOUR_TEXT, COLOUR_LONGTEXT,
 170                 true )
 171     add_integer( "v4l-hue", -1, NULL, HUE_TEXT, HUE_LONGTEXT, true )
 172     add_integer( "v4l-contrast", -1, NULL, CONTRAST_TEXT, CONTRAST_LONGTEXT,
 173                 true )
 174     add_bool( "v4l-mjpeg", false, NULL, MJPEG_TEXT, MJPEG_LONGTEXT,
 175             true )
 176     add_integer( "v4l-decimation", 1, NULL, DECIMATION_TEXT,
 177             DECIMATION_LONGTEXT, true )
 178     add_integer( "v4l-quality", 100, NULL, QUALITY_TEXT, QUALITY_LONGTEXT,
 179             true )
 180
 181     add_shortcut( "v4l" )
 182     set_capability( "access_demux", 10 )
 183     set_callbacks( Open, Close )
 184 vlc_module_end ()
 185
 186 /*****************************************************************************
 187  * Access: local prototypes
 188  *****************************************************************************/
 189 static int Demux  ( demux_t * );
 190 static int Control( demux_t *, int, va_list );
 191
 192 static void ParseMRL    ( demux_t * );
 193 static int  OpenVideoDev( demux_t *, char * );
 194 static block_t *GrabVideo( demux_t * );
 195
 196 #define MJPEG_BUFFER_SIZE (256*1024)
 197
 198 struct quicktime_mjpeg_app1
 199 {
 200     uint32_t    i_reserved;             /* set to 0 */
 201     uint32_t    i_tag;                  /* 'mjpg' */
 202     uint32_t    i_field_size;           /* offset following EOI */
 203     uint32_t    i_padded_field_size;    /* offset following EOI+pad */
 204     uint32_t    i_next_field;           /* offset to next field */
 205     uint32_t    i_DQT_offset;
 206     uint32_t    i_DHT_offset;
 207     uint32_t    i_SOF_offset;
 208     uint32_t    i_SOS_offset;
 209     uint32_t    i_data_offset;          /* following SOS marker data */
 210 };
 211
 212 static const struct
 213 {
 214     int i_v4l;
 215     vlc_fourcc_t i_fourcc;
 216
 217 } v4lchroma_to_fourcc[] =
 218 {
 219     { VIDEO_PALETTE_GREY, VLC_CODEC_GREY },
 220     { VIDEO_PALETTE_HI240, VLC_FOURCC( 'I', '2', '4', '0' ) },
 221     { VIDEO_PALETTE_RGB565, VLC_CODEC_RGB16 },
 222     { VIDEO_PALETTE_RGB555, VLC_CODEC_RGB15 },
 223     { VIDEO_PALETTE_RGB24, VLC_CODEC_RGB24 },
 224     { VIDEO_PALETTE_RGB32, VLC_CODEC_RGB32 },
 225     { VIDEO_PALETTE_YUV422, VLC_CODEC_YUYV },
 226     { VIDEO_PALETTE_YUYV, VLC_CODEC_YUYV },
 227     { VIDEO_PALETTE_UYVY, VLC_CODEC_UYVY },
 228     { VIDEO_PALETTE_YUV420, VLC_FOURCC( 'I', '4', '2', 'N' ) },
 229     { VIDEO_PALETTE_YUV411, VLC_FOURCC( 'I', '4', '1', 'N' ) },
 230     { VIDEO_PALETTE_RAW, VLC_FOURCC( 'G', 'R', 'A', 'W' ) },
 231     { VIDEO_PALETTE_YUV422P, VLC_CODEC_I422 },
 232     { VIDEO_PALETTE_YUV420P, VLC_CODEC_I420 },
 233     { VIDEO_PALETTE_YUV411P, VLC_CODEC_I411 },
 234     { 0, 0 }
 235 };
 236
 237 struct demux_sys_t
 238 {
 239     /* Devices */
 240     char *psz_device;         /* Main device from MRL */
 241     int  i_fd;
 242
 243     /* Video properties */
 244     picture_t pic;
 245
 246     int i_fourcc;
 247     int i_channel;
 248     int i_audio;
 249     int i_norm;
 250     int i_tuner;
 251     int i_frequency;
 252     int i_width;
 253     int i_height;
 254
 255     int i_brightness;
 256     int i_hue;
 257     int i_colour;
 258     int i_contrast;
 259
 260     float f_fps;            /* <= 0.0 mean to grab at full rate */
 261     mtime_t i_video_pts;    /* only used when f_fps > 0 */
 262
 263     bool b_mjpeg;
 264     int i_decimation;
 265     int i_quality;
 266
 267     struct video_capability vid_cap;
 268     struct video_mbuf       vid_mbuf;
 269     struct mjpeg_requestbuffers mjpeg_buffers;
 270
 271     uint8_t *p_video_mmap;
 272     int     i_frame_pos;
 273
 274     struct video_mmap   vid_mmap;
 275     struct video_picture vid_picture;
 276
 277     int          i_video_frame_size;
 278     es_out_id_t  *p_es;
 279 };
 280
 281 /*****************************************************************************
 282  * Open: opens v4l device
 283  *****************************************************************************
 284  *
 285  * url: <video device>::::
 286  *
 287  *****************************************************************************/
 288 static int Open( vlc_object_t *p_this )
 289 {
 290     demux_t     *p_demux = (demux_t*)p_this;
 291     demux_sys_t *p_sys;
 292
 293     /* Only when selected */
 294     if( *p_demux->psz_access == '\0' )
 295         return VLC_EGENERIC;
 296
 297     /* Set up p_demux */
 298     p_demux->pf_demux = Demux;
 299     p_demux->pf_control = Control;
 300     p_demux->info.i_update = 0;
 301     p_demux->info.i_title = 0;
 302     p_demux->info.i_seekpoint = 0;
 303     p_demux->p_sys = p_sys = calloc( 1, sizeof( demux_sys_t ) );
 304     if( !p_sys )
 305         return VLC_ENOMEM;
 306
 307     p_sys->i_audio      = var_CreateGetInteger( p_demux, "v4l-audio" );
 308     p_sys->i_channel    = var_CreateGetInteger( p_demux, "v4l-channel" );
 309     p_sys->i_norm       = var_CreateGetInteger( p_demux, "v4l-norm" );
 310     p_sys->i_tuner      = var_CreateGetInteger( p_demux, "v4l-tuner" );
 311     p_sys->i_frequency  = var_CreateGetInteger( p_demux, "v4l-frequency" );
 312
 313     p_sys->f_fps        = var_CreateGetFloat( p_demux, "v4l-fps" );
 314     p_sys->i_width      = var_CreateGetInteger( p_demux, "v4l-width" );
 315     p_sys->i_height     = var_CreateGetInteger( p_demux, "v4l-height" );
 316     p_sys->i_video_pts  = -1;
 317     p_sys->i_brightness = var_CreateGetInteger( p_demux, "v4l-brightness" );
 318
 319     p_sys->i_hue        = var_CreateGetInteger( p_demux, "v4l-hue" );
 320     p_sys->i_colour     = var_CreateGetInteger( p_demux, "v4l-colour" );
 321     p_sys->i_contrast   = var_CreateGetInteger( p_demux, "v4l-contrast" );
 322
 323     p_sys->b_mjpeg      = var_CreateGetBool( p_demux, "v4l-mjpeg" );
 324     p_sys->i_decimation = var_CreateGetInteger( p_demux, "v4l-decimation" );
 325     p_sys->i_quality    = var_CreateGetInteger( p_demux, "v4l-quality" );
 326
 327     p_sys->psz_device = NULL;
 328     p_sys->i_fd = -1;
 329
 330     p_sys->p_es = NULL;
 331
 332     ParseMRL( p_demux );
 333
 334     msg_Dbg( p_this, "opening device '%s'", p_sys->psz_device );
 335     p_sys->i_fd = OpenVideoDev( p_demux, p_sys->psz_device );
 336     if( p_sys->i_fd < 0 )
 337     {
 338         Close( p_this );
 339         return VLC_EGENERIC;
 340     }
 341
 342
 343     msg_Dbg( p_demux, "v4l grabbing started" );
 344
 345     /* Declare elementary streams */
 346     es_format_t fmt;
 347     es_format_Init( &fmt, VIDEO_ES, p_sys->i_fourcc );
 348     fmt.video.i_width  = p_sys->i_width;
 349     fmt.video.i_height = p_sys->i_height;
 350     fmt.video.i_aspect = 4 * VOUT_ASPECT_FACTOR / 3;
 351
 352     /* Setup rgb mask for RGB formats */
 353     switch( p_sys->i_fourcc )
 354     {
 355         case VLC_CODEC_RGB15:
 356             fmt.video.i_rmask = 0x001f;
 357             fmt.video.i_gmask = 0x03e0;
 358             fmt.video.i_bmask = 0x7c00;
 359             break;
 360         case VLC_CODEC_RGB16:
 361             fmt.video.i_rmask = 0x001f;
 362             fmt.video.i_gmask = 0x07e0;
 363             fmt.video.i_bmask = 0xf800;
 364             break;
 365         case VLC_CODEC_RGB24:
 366         case VLC_CODEC_RGB32:
 367             fmt.video.i_rmask = 0x00ff0000;
 368             fmt.video.i_gmask = 0x0000ff00;
 369             fmt.video.i_bmask = 0x000000ff;
 370             break;
 371     }
 372
 373     msg_Dbg( p_demux, "added new video es %4.4s %dx%d",
 374              (char*)&fmt.i_codec, fmt.video.i_width, fmt.video.i_height );
 375     p_sys->p_es = es_out_Add( p_demux->out, &fmt );
 376
 377     /* Update default_pts to a suitable value for access */
 378     var_Create( p_demux, "v4l-caching", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 379
 380     return VLC_SUCCESS;
 381 }
 382
 383 /*****************************************************************************
 384  * Close: close device, free resources
 385  *****************************************************************************/
 386 static void Close( vlc_object_t *p_this )
 387 {
 388     demux_t     *p_demux = (demux_t *)p_this;
 389     demux_sys_t *p_sys   = p_demux->p_sys;
 390
 391     free( p_sys->psz_device );
 392     if( p_sys->i_fd >= 0 ) close( p_sys->i_fd );
 393
 394     if( p_sys->b_mjpeg )
 395     {
 396         int i_noframe = -1;
 397         ioctl( p_sys->i_fd, MJPIOC_QBUF_CAPT, &i_noframe );
 398     }
 399
 400     if( p_sys->p_video_mmap && p_sys->p_video_mmap != MAP_FAILED )
 401     {
 402         if( p_sys->b_mjpeg )
 403             munmap( p_sys->p_video_mmap, p_sys->mjpeg_buffers.size *
 404                     p_sys->mjpeg_buffers.count );
 405         else
 406             munmap( p_sys->p_video_mmap, p_sys->vid_mbuf.size );
 407     }
 408
 409     free( p_sys );
 410 }
 411
 412 /*****************************************************************************
 413  * Control:
 414  *****************************************************************************/
 415 static int Control( demux_t *p_demux, int i_query, va_list args )
 416 {
 417     bool *pb;
 418     int64_t    *pi64;
 419
 420     switch( i_query )
 421     {
 422         /* Special for access_demux */
 423         case DEMUX_CAN_PAUSE:
 424         case DEMUX_CAN_SEEK:
 425         case DEMUX_CAN_CONTROL_PACE:
 426             pb = (bool*)va_arg( args, bool * );
 427             *pb = false;
 428             return VLC_SUCCESS;
 429
 430         case DEMUX_GET_PTS_DELAY:
 431             pi64 = (int64_t*)va_arg( args, int64_t * );
 432             *pi64 = (int64_t)var_GetInteger( p_demux, "v4l-caching" ) * 1000;
 433             return VLC_SUCCESS;
 434
 435         case DEMUX_GET_TIME:
 436             pi64 = (int64_t*)va_arg( args, int64_t * );
 437             *pi64 = mdate();
 438             return VLC_SUCCESS;
 439
 440         /* TODO implement others */
 441         default:
 442             return VLC_EGENERIC;
 443     }
 444
 445     return VLC_EGENERIC;
 446 }
 447
 448 /*****************************************************************************
 449  * Demux:
 450  *****************************************************************************/
 451 static int Demux( demux_t *p_demux )
 452 {
 453     demux_sys_t *p_sys = p_demux->p_sys;
 454
 455     block_t *p_block = GrabVideo( p_demux );
 456
 457     if( !p_block )
 458     {
 459         msleep( 10000 ); /* Unfortunately v4l doesn't allow polling */
 460         return 1;
 461     }
 462
 463     es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
 464     es_out_Send( p_demux->out, p_sys->p_es, p_block );
 465
 466     return 1;
 467 }
 468
 469 /*****************************************************************************
 470  * ParseMRL: parse the options contained in the MRL
 471  *****************************************************************************/
 472 static void ParseMRL( demux_t *p_demux )
 473 {
 474     demux_sys_t *p_sys = p_demux->p_sys;
 475
 476     char *psz_dup = strdup( p_demux->psz_path );
 477     char *psz_parser = psz_dup;
 478
 479     while( *psz_parser && *psz_parser != ':' )
 480     {
 481         psz_parser++;
 482     }
 483
 484     if( *psz_parser == ':' )
 485     {
 486         /* read options */
 487         for( ;; )
 488         {
 489             *psz_parser++ = '\0';
 490             if( !strncmp( psz_parser, "channel=", strlen( "channel=" ) ) )
 491             {
 492                 p_sys->i_channel = strtol( psz_parser + strlen( "channel=" ),
 493                                            &psz_parser, 0 );
 494             }
 495             else if( !strncmp( psz_parser, "norm=", strlen( "norm=" ) ) )
 496             {
 497                 psz_parser += strlen( "norm=" );
 498                 if( !strncmp( psz_parser, "pal", strlen( "pal" ) ) )
 499                 {
 500                     p_sys->i_norm = VIDEO_MODE_PAL;
 501                     psz_parser += strlen( "pal" );
 502                 }
 503                 else if( !strncmp( psz_parser, "ntsc", strlen( "ntsc" ) ) )
 504                 {
 505                     p_sys->i_norm = VIDEO_MODE_NTSC;
 506                     psz_parser += strlen( "ntsc" );
 507                 }
 508                 else if( !strncmp( psz_parser, "secam", strlen( "secam" ) ) )
 509                 {
 510                     p_sys->i_norm = VIDEO_MODE_SECAM;
 511                     psz_parser += strlen( "secam" );
 512                 }
 513                 else if( !strncmp( psz_parser, "auto", strlen( "auto" ) ) )
 514                 {
 515                     p_sys->i_norm = VIDEO_MODE_AUTO;
 516                     psz_parser += strlen( "auto" );
 517                 }
 518                 else
 519                 {
 520                     p_sys->i_norm = strtol( psz_parser, &psz_parser, 0 );
 521                 }
 522             }
 523             else if( !strncmp( psz_parser, "frequency=",
 524                                strlen( "frequency=" ) ) )
 525             {
 526                 p_sys->i_frequency =
 527                     strtol( psz_parser + strlen( "frequency=" ),
 528                             &psz_parser, 0 );
 529                 if( p_sys->i_frequency < 30000 )
 530                 {
 531                     msg_Warn( p_demux, "v4l syntax has changed : "
 532                               "'frequency' is now channel frequency in kHz");
 533                 }
 534             }
 535             else if( !strncmp( psz_parser, "audio=", strlen( "audio=" ) ) )
 536             {
 537                 p_sys->i_audio = strtol( psz_parser + strlen( "audio=" ),
 538                                          &psz_parser, 0 );
 539             }
 540             else if( !strncmp( psz_parser, "size=", strlen( "size=" ) ) )
 541             {
 542                 psz_parser += strlen( "size=" );
 543                 if( !strncmp( psz_parser, "subqcif", strlen( "subqcif" ) ) )
 544                 {
 545                     p_sys->i_width  = 128;
 546                     p_sys->i_height = 96;
 547                 }
 548                 else if( !strncmp( psz_parser, "qsif", strlen( "qsif" ) ) )
 549                 {
 550                     p_sys->i_width  = 160;
 551                     p_sys->i_height = 120;
 552                 }
 553                 else if( !strncmp( psz_parser, "qcif", strlen( "qcif" ) ) )
 554                 {
 555                     p_sys->i_width  = 176;
 556                     p_sys->i_height = 144;
 557                 }
 558                 else if( !strncmp( psz_parser, "sif", strlen( "sif" ) ) )
 559                 {
 560                     p_sys->i_width  = 320;
 561                     p_sys->i_height = 244;
 562                 }
 563                 else if( !strncmp( psz_parser, "cif", strlen( "cif" ) ) )
 564                 {
 565                     p_sys->i_width  = 352;
 566                     p_sys->i_height = 288;
 567                 }
 568                 else if( !strncmp( psz_parser, "vga", strlen( "vga" ) ) )
 569                 {
 570                     p_sys->i_width  = 640;
 571                     p_sys->i_height = 480;
 572                 }
 573                 else
 574                 {
 575                     /* widthxheight */
 576                     p_sys->i_width = strtol( psz_parser, &psz_parser, 0 );
 577                     if( *psz_parser == 'x' || *psz_parser == 'X')
 578                     {
 579                         p_sys->i_height = strtol( psz_parser + 1,
 580                                                   &psz_parser, 0 );
 581                     }
 582                     msg_Dbg( p_demux, "WxH %dx%d", p_sys->i_width,
 583                              p_sys->i_height );
 584                 }
 585             }
 586             else if( !strncmp( psz_parser, "brightness=", strlen( "brightness=" ) ) )
 587             {
 588                 p_sys->i_brightness = strtol( psz_parser + strlen( "brightness=" ),
 589                                               &psz_parser, 0 );
 590             }
 591             else if( !strncmp( psz_parser, "colour=", strlen( "colour=" ) ) )
 592             {
 593                 p_sys->i_colour = strtol( psz_parser + strlen( "colour=" ),
 594                                           &psz_parser, 0 );
 595             }
 596             else if( !strncmp( psz_parser, "hue=", strlen( "hue=" ) ) )
 597             {
 598                 p_sys->i_hue = strtol( psz_parser + strlen( "hue=" ),
 599                                        &psz_parser, 0 );
 600             }
 601             else if( !strncmp( psz_parser, "contrast=", strlen( "contrast=" ) ) )
 602             {
 603                 p_sys->i_contrast = strtol( psz_parser + strlen( "contrast=" ),
 604                                             &psz_parser, 0 );
 605             }
 606             else if( !strncmp( psz_parser, "tuner=", strlen( "tuner=" ) ) )
 607             {
 608                 p_sys->i_tuner = strtol( psz_parser + strlen( "tuner=" ),
 609                                          &psz_parser, 0 );
 610             }
 611             else if( !strncmp( psz_parser, "mjpeg", strlen( "mjpeg" ) ) )
 612             {
 613                 psz_parser += strlen( "mjpeg" );
 614
 615                 p_sys->b_mjpeg = true;
 616             }
 617             else if( !strncmp( psz_parser, "decimation=",
 618                         strlen( "decimation=" ) ) )
 619             {
 620                 p_sys->i_decimation =
 621                     strtol( psz_parser + strlen( "decimation=" ),
 622                             &psz_parser, 0 );
 623             }
 624             else if( !strncmp( psz_parser, "quality=",
 625                         strlen( "quality=" ) ) )
 626             {
 627                 p_sys->i_quality =
 628                     strtol( psz_parser + strlen( "quality=" ),
 629                             &psz_parser, 0 );
 630             }
 631             else if( !strncmp( psz_parser, "fps=", strlen( "fps=" ) ) )
 632             {
 633                 p_sys->f_fps = strtof( psz_parser + strlen( "fps=" ),
 634                                        &psz_parser );
 635             }
 636             else if( !strncmp( psz_parser, "adev=", strlen( "adev=" ) )
 637              || !strncmp( psz_parser, "samplerate=", strlen( "samplerate=" ) )
 638              || !strncmp( psz_parser, "stereo", strlen( "stereo" ) )
 639              || !strncmp( psz_parser, "mono", strlen( "mono" ) ) )
 640             {
 641                 if( strchr( psz_parser, ':' ) )
 642                     psz_parser = strchr( psz_parser, ':' );
 643                 else
 644                     psz_parser += strlen( psz_parser );
 645                 msg_Err( p_demux, AUDIO_DEPRECATED_ERROR );
 646             }
 647             else
 648             {
 649                 msg_Warn( p_demux, "unknown option" );
 650             }
 651
 652             while( *psz_parser && *psz_parser != ':' )
 653             {
 654                 psz_parser++;
 655             }
 656
 657             if( *psz_parser == '\0' )
 658             {
 659                 break;
 660             }
 661         }
 662     }
 663
 664     if( *psz_dup )
 665         p_sys->psz_device = strdup( psz_dup );
 666     else
 667         p_sys->psz_device = strdup( V4L_DEFAULT );
 668     free( psz_dup );
 669 }
 670
 671 /*****************************************************************************
 672  * OpenVideoDev:
 673  *****************************************************************************/
 674 static int OpenVideoDev( demux_t *p_demux, char *psz_device )
 675 {
 676     demux_sys_t *p_sys = p_demux->p_sys;
 677     int i_fd;
 678
 679     struct video_channel vid_channel;
 680     struct mjpeg_params mjpeg;
 681     int i;
 682
 683     if( ( i_fd = open( psz_device, O_RDWR ) ) < 0 )
 684     {
 685         msg_Err( p_demux, "cannot open device (%m)" );
 686         goto vdev_failed;
 687     }
 688
 689     if( ioctl( i_fd, VIDIOCGCAP, &p_sys->vid_cap ) < 0 )
 690     {
 691         msg_Err( p_demux, "cannot get capabilities (%m)" );
 692         goto vdev_failed;
 693     }
 694
 695     msg_Dbg( p_demux,
 696              "V4L device %s %d channels %d audios %d < w < %d %d < h < %d",
 697              p_sys->vid_cap.name,
 698              p_sys->vid_cap.channels,
 699              p_sys->vid_cap.audios,
 700              p_sys->vid_cap.minwidth,  p_sys->vid_cap.maxwidth,
 701              p_sys->vid_cap.minheight, p_sys->vid_cap.maxheight );
 702
 703     if( p_sys->i_channel < 0 || p_sys->i_channel >= p_sys->vid_cap.channels )
 704     {
 705         msg_Dbg( p_demux, "invalid channel, falling back on channel 0" );
 706         p_sys->i_channel = 0;
 707     }
 708     if( p_sys->vid_cap.audios && p_sys->i_audio >= p_sys->vid_cap.audios )
 709     {
 710         msg_Dbg( p_demux, "invalid audio, falling back with no audio" );
 711         p_sys->i_audio = -1;
 712     }
 713
 714     if( p_sys->i_width < p_sys->vid_cap.minwidth ||
 715         p_sys->i_width > p_sys->vid_cap.maxwidth )
 716     {
 717         msg_Dbg( p_demux, "invalid width %i", p_sys->i_width );
 718         p_sys->i_width = 0;
 719     }
 720     if( p_sys->i_height < p_sys->vid_cap.minheight ||
 721         p_sys->i_height > p_sys->vid_cap.maxheight )
 722     {
 723         msg_Dbg( p_demux, "invalid height %i", p_sys->i_height );
 724         p_sys->i_height = 0;
 725     }
 726
 727     if( !( p_sys->vid_cap.type & VID_TYPE_CAPTURE ) )
 728     {
 729         msg_Err( p_demux, "cannot grab" );
 730         goto vdev_failed;
 731     }
 732
 733     vid_channel.channel = p_sys->i_channel;
 734     if( ioctl( i_fd, VIDIOCGCHAN, &vid_channel ) < 0 )
 735     {
 736         msg_Err( p_demux, "cannot get channel infos (%m)" );
 737         goto vdev_failed;
 738     }
 739     msg_Dbg( p_demux,
 740              "setting channel %s(%d) %d tuners flags=0x%x type=0x%x norm=0x%x",
 741              vid_channel.name, vid_channel.channel, vid_channel.tuners,
 742              vid_channel.flags, vid_channel.type, vid_channel.norm );
 743
 744     if( p_sys->i_tuner >= vid_channel.tuners )
 745     {
 746         msg_Dbg( p_demux, "invalid tuner, falling back on tuner 0" );
 747         p_sys->i_tuner = 0;
 748     }
 749
 750     vid_channel.norm = p_sys->i_norm;
 751     if( ioctl( i_fd, VIDIOCSCHAN, &vid_channel ) < 0 )
 752     {
 753         msg_Err( p_demux, "cannot set channel (%m)" );
 754         goto vdev_failed;
 755     }
 756
 757     if( vid_channel.flags & VIDEO_VC_TUNER )
 758     {
 759
 760         /* set tuner */
 761 #if 0
 762         struct video_tuner vid_tuner;
 763         if( p_sys->i_tuner >= 0 )
 764         {
 765             vid_tuner.tuner = p_sys->i_tuner;
 766             if( ioctl( i_fd, VIDIOCGTUNER, &vid_tuner ) < 0 )
 767             {
 768                 msg_Err( p_demux, "cannot get tuner (%m)" );
 769                 goto vdev_failed;
 770             }
 771             msg_Dbg( p_demux, "tuner %s low=%d high=%d, flags=0x%x "
 772                      "mode=0x%x signal=0x%x",
 773                      vid_tuner.name, vid_tuner.rangelow, vid_tuner.rangehigh,
 774                      vid_tuner.flags, vid_tuner.mode, vid_tuner.signal );
 775
 776             msg_Dbg( p_demux, "setting tuner %s (%d)",
 777                      vid_tuner.name, vid_tuner.tuner );
 778
 779             /* FIXME FIXME to be checked FIXME FIXME */
 780             //vid_tuner.mode = p_sys->i_norm;
 781             if( ioctl( i_fd, VIDIOCSTUNER, &vid_tuner ) < 0 )
 782             {
 783                 msg_Err( p_demux, "cannot set tuner (%m)" );
 784                 goto vdev_failed;
 785             }
 786         }
 787 #endif
 788
 789         /* Show a warning if frequency is < than 30000.
 790          * User is certainly usint old syntax. */
 791
 792
 793         /* set frequency */
 794         if( p_sys->i_frequency >= 0 )
 795         {
 796             int driver_frequency = p_sys->i_frequency * 16 /1000;
 797             if( ioctl( i_fd, VIDIOCSFREQ, &driver_frequency ) < 0 )
 798             {
 799                 msg_Err( p_demux, "cannot set frequency (%m)" );
 800                 goto vdev_failed;
 801             }
 802             msg_Dbg( p_demux, "frequency %d (%d)", p_sys->i_frequency,
 803                                                    driver_frequency );
 804         }
 805     }
 806
 807     /* set audio */
 808     if( vid_channel.flags & VIDEO_VC_AUDIO )
 809     {
 810         struct video_audio      vid_audio;
 811
 812         /* XXX TODO volume, balance, ... */
 813         if( p_sys->i_audio >= 0 )
 814         {
 815             vid_audio.audio = p_sys->i_audio;
 816             if( ioctl( i_fd, VIDIOCGAUDIO, &vid_audio ) < 0 )
 817             {
 818                 msg_Err( p_demux, "cannot get audio (%m)" );
 819                 goto vdev_failed;
 820             }
 821
 822             /* unmute audio */
 823             vid_audio.flags &= ~VIDEO_AUDIO_MUTE;
 824
 825             if( ioctl( i_fd, VIDIOCSAUDIO, &vid_audio ) < 0 )
 826             {
 827                 msg_Err( p_demux, "cannot set audio (%m)" );
 828                 goto vdev_failed;
 829             }
 830         }
 831
 832     }
 833
 834     /* establish basic params with input and norm before feeling width
 835      * or height */
 836     if( p_sys->b_mjpeg )
 837     {
 838         struct quicktime_mjpeg_app1 *p_app1;
 839         int32_t i_offset;
 840
 841         if( ioctl( i_fd, MJPIOC_G_PARAMS, &mjpeg ) < 0 )
 842         {
 843             msg_Err( p_demux, "cannot get mjpeg params (%m)" );
 844             goto vdev_failed;
 845         }
 846         mjpeg.input = p_sys->i_channel;
 847         mjpeg.norm  = p_sys->i_norm;
 848         mjpeg.decimation = p_sys->i_decimation;
 849
 850         if( p_sys->i_width )
 851             mjpeg.img_width = p_sys->i_width / p_sys->i_decimation;
 852         if( p_sys->i_height )
 853             mjpeg.img_height = p_sys->i_height / p_sys->i_decimation;
 854
 855         /* establish Quicktime APP1 marker while we are here */
 856         mjpeg.APPn = 1;
 857         mjpeg.APP_len = 40;
 858
 859         /* aligned */
 860         p_app1 = (struct quicktime_mjpeg_app1 *)mjpeg.APP_data;
 861         p_app1->i_reserved = 0;
 862         p_app1->i_tag = VLC_FOURCC( 'm','j','p','g' );
 863         p_app1->i_field_size = 0;
 864         p_app1->i_padded_field_size = 0;
 865         p_app1->i_next_field = 0;
 866         /* XXX WARNING XXX */
 867         /* these's nothing magic about these values.  We are dangerously
 868          * assuming the encoder card is encoding mjpeg-a and is not throwing
 869          * in marker tags we aren't expecting.  It's bad enough we have to
 870          * search through the jpeg output for every frame we grab just to
 871          * find the first field's end marker, so we take this risk to boost
 872          * performance.
 873          * This is really something the driver could do for us because this
 874          * does conform to standards outside of Apple Quicktime.
 875          */
 876         i_offset = 0x2e;
 877         p_app1->i_DQT_offset = hton32( i_offset );
 878         i_offset = 0xb4;
 879         p_app1->i_DHT_offset = hton32( i_offset );
 880         i_offset = 0x258;
 881         p_app1->i_SOF_offset = hton32( i_offset );
 882         i_offset = 0x26b;
 883         p_app1->i_SOS_offset = hton32( i_offset );
 884         i_offset = 0x279;
 885         p_app1->i_data_offset = hton32( i_offset );
 886
 887         /* SOF and SOS aren't specified by the mjpeg API because they aren't
 888          * optional.  They will be present in the output. */
 889         mjpeg.jpeg_markers = JPEG_MARKER_DHT | JPEG_MARKER_DQT;
 890
 891         if( ioctl( i_fd, MJPIOC_S_PARAMS, &mjpeg ) < 0 )
 892         {
 893             msg_Err( p_demux, "cannot set mjpeg params (%m)" );
 894             goto vdev_failed;
 895         }
 896
 897         p_sys->i_width = mjpeg.img_width * mjpeg.HorDcm;
 898         p_sys->i_height = mjpeg.img_height * mjpeg.VerDcm *
 899             mjpeg.field_per_buff;
 900     }
 901
 902     /* fix width/height */
 903     if( !p_sys->b_mjpeg && ( p_sys->i_width == 0 || p_sys->i_height == 0 ) )
 904     {
 905         struct video_window vid_win;
 906
 907         if( ioctl( i_fd, VIDIOCGWIN, &vid_win ) < 0 )
 908         {
 909             msg_Err( p_demux, "cannot get win (%m)" );
 910             goto vdev_failed;
 911         }
 912         p_sys->i_width  = vid_win.width;
 913         p_sys->i_height = vid_win.height;
 914
 915         if( !p_sys->i_width || !p_sys->i_height )
 916         {
 917             p_sys->i_width = p_sys->vid_cap.maxwidth;
 918             p_sys->i_height = p_sys->vid_cap.maxheight;
 919         }
 920
 921         if( !p_sys->i_width || !p_sys->i_height )
 922         {
 923             msg_Err( p_demux, "invalid video size (%ix%i)",
 924                      p_sys->i_width, p_sys->i_height );
 925             goto vdev_failed;
 926         }
 927
 928         msg_Dbg( p_demux, "will use %dx%d", p_sys->i_width, p_sys->i_height );
 929     }
 930
 931     if( !p_sys->b_mjpeg )
 932     {
 933         /* set hue/color/.. */
 934         if( ioctl( i_fd, VIDIOCGPICT, &p_sys->vid_picture ) == 0 )
 935         {
 936             struct video_picture vid_picture = p_sys->vid_picture;
 937
 938             if( p_sys->i_brightness >= 0 && p_sys->i_brightness < 65536 )
 939             {
 940                 vid_picture.brightness = p_sys->i_brightness;
 941             }
 942             if( p_sys->i_colour >= 0 && p_sys->i_colour < 65536 )
 943             {
 944                 vid_picture.colour = p_sys->i_colour;
 945             }
 946             if( p_sys->i_hue >= 0 && p_sys->i_hue < 65536 )
 947             {
 948                 vid_picture.hue = p_sys->i_hue;
 949             }
 950             if( p_sys->i_contrast  >= 0 && p_sys->i_contrast < 65536 )
 951             {
 952                 vid_picture.contrast = p_sys->i_contrast;
 953             }
 954             if( ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
 955             {
 956                 msg_Dbg( p_demux, "v4l device uses brightness: %d",
 957                          vid_picture.brightness );
 958                 msg_Dbg( p_demux, "v4l device uses colour: %d",
 959                          vid_picture.colour );
 960                 msg_Dbg( p_demux, "v4l device uses hue: %d", vid_picture.hue );
 961                 msg_Dbg( p_demux, "v4l device uses contrast: %d",
 962                          vid_picture.contrast );
 963                 p_sys->vid_picture = vid_picture;
 964             }
 965         }
 966
 967         /* Find out video format used by device */
 968         if( ioctl( i_fd, VIDIOCGPICT, &p_sys->vid_picture ) == 0 )
 969         {
 970             struct video_picture vid_picture = p_sys->vid_picture;
 971             char *psz;
 972             int i;
 973
 974             p_sys->i_fourcc = 0;
 975
 976             psz = var_CreateGetString( p_demux, "v4l-chroma" );
 977
 978             const vlc_fourcc_t i_chroma =
 979                 vlc_fourcc_GetCodecFromString( VIDEO_ES, psz );
 980             if( i_chroma )
 981             {
 982                 vid_picture.palette = 0;
 983
 984                 /* Find out v4l chroma code */
 985                 for( i = 0; v4lchroma_to_fourcc[i].i_v4l != 0; i++ )
 986                 {
 987                     if( v4lchroma_to_fourcc[i].i_fourcc == i_chroma )
 988                     {
 989                         vid_picture.palette = v4lchroma_to_fourcc[i].i_v4l;
 990                         break;
 991                     }
 992                 }
 993             }
 994             free( psz );
 995
 996             if( vid_picture.palette &&
 997                 !ioctl( i_fd, VIDIOCSPICT, &vid_picture ) )
 998             {
 999                 p_sys->vid_picture = vid_picture;
1000             }
1001             else
1002             {
1003                 /* Try to set the format to something easy to encode */
1004                 vid_picture.palette = VIDEO_PALETTE_YUV420P;
1005                 if( ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
1006                 {
1007                     p_sys->vid_picture = vid_picture;
1008                 }
1009                 else
1010                 {
1011                     vid_picture.palette = VIDEO_PALETTE_YUV422P;
1012                     if( ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
1013                     {
1014                         p_sys->vid_picture = vid_picture;
1015                     }
1016                 }
1017             }
1018
1019             /* Find out final format */
1020             for( i = 0; v4lchroma_to_fourcc[i].i_v4l != 0; i++ )
1021             {
1022                 if( v4lchroma_to_fourcc[i].i_v4l == p_sys->vid_picture.palette)
1023                 {
1024                     p_sys->i_fourcc = v4lchroma_to_fourcc[i].i_fourcc;
1025                     break;
1026                 }
1027             }
1028         }
1029         else
1030         {
1031             msg_Err( p_demux, "ioctl VIDIOCGPICT failed" );
1032             goto vdev_failed;
1033         }
1034     }
1035
1036     if( p_sys->b_mjpeg )
1037     {
1038         int i;
1039
1040         p_sys->mjpeg_buffers.count = 8;
1041         p_sys->mjpeg_buffers.size = MJPEG_BUFFER_SIZE;
1042
1043         if( ioctl( i_fd, MJPIOC_REQBUFS, &p_sys->mjpeg_buffers ) < 0 )
1044         {
1045             msg_Err( p_demux, "mmap unsupported" );
1046             goto vdev_failed;
1047         }
1048
1049         p_sys->p_video_mmap = mmap( 0,
1050                 p_sys->mjpeg_buffers.size * p_sys->mjpeg_buffers.count,
1051                 PROT_READ | PROT_WRITE, MAP_SHARED, i_fd, 0 );
1052         if( p_sys->p_video_mmap == MAP_FAILED )
1053         {
1054             msg_Err( p_demux, "mmap failed" );
1055             goto vdev_failed;
1056         }
1057
1058         p_sys->i_fourcc  = VLC_CODEC_MJPG;
1059         p_sys->i_frame_pos = -1;
1060
1061         /* queue up all the frames */
1062         for( i = 0; i < (int)p_sys->mjpeg_buffers.count; i++ )
1063         {
1064             if( ioctl( i_fd, MJPIOC_QBUF_CAPT, &i ) < 0 )
1065             {
1066                 msg_Err( p_demux, "unable to queue frame" );
1067                 goto vdev_failed;
1068             }
1069         }
1070     }
1071     else
1072     {
1073         /* Fill in picture_t fields */
1074         if( picture_Setup( &p_sys->pic, p_sys->i_fourcc,
1075                            p_sys->i_width, p_sys->i_height, p_sys->i_width *
1076                            VOUT_ASPECT_FACTOR / p_sys->i_height ) )
1077         {
1078             msg_Err( p_demux, "unsupported chroma" );
1079             goto vdev_failed;
1080         }
1081         p_sys->i_video_frame_size = 0;
1082         for( i = 0; i < p_sys->pic.i_planes; i++ )
1083         {
1084             p_sys->i_video_frame_size += p_sys->pic.p[i].i_visible_lines *
1085               p_sys->pic.p[i].i_visible_pitch;
1086         }
1087
1088         msg_Dbg( p_demux, "v4l device uses frame size: %i",
1089                  p_sys->i_video_frame_size );
1090         msg_Dbg( p_demux, "v4l device uses chroma: %4.4s",
1091                 (char*)&p_sys->i_fourcc );
1092
1093         /* Allocate mmap buffer */
1094         if( ioctl( i_fd, VIDIOCGMBUF, &p_sys->vid_mbuf ) < 0 )
1095         {
1096             msg_Err( p_demux, "mmap unsupported" );
1097             goto vdev_failed;
1098         }
1099
1100         p_sys->p_video_mmap = mmap( 0, p_sys->vid_mbuf.size,
1101                                     PROT_READ|PROT_WRITE, MAP_SHARED,
1102                                     i_fd, 0 );
1103         if( p_sys->p_video_mmap == MAP_FAILED )
1104         {
1105             /* FIXME -> normal read */
1106             msg_Err( p_demux, "mmap failed" );
1107             goto vdev_failed;
1108         }
1109
1110         /* init grabbing */
1111         p_sys->vid_mmap.frame  = 0;
1112         p_sys->vid_mmap.width  = p_sys->i_width;
1113         p_sys->vid_mmap.height = p_sys->i_height;
1114         p_sys->vid_mmap.format = p_sys->vid_picture.palette;
1115         if( ioctl( i_fd, VIDIOCMCAPTURE, &p_sys->vid_mmap ) < 0 )
1116         {
1117             msg_Warn( p_demux, "%4.4s refused", (char*)&p_sys->i_fourcc );
1118             msg_Err( p_demux, "chroma selection failed" );
1119             goto vdev_failed;
1120         }
1121     }
1122     return i_fd;
1123
1124 vdev_failed:
1125
1126     if( i_fd >= 0 ) close( i_fd );
1127     return -1;
1128 }
1129
1130 /*****************************************************************************
1131  * GrabVideo:
1132  *****************************************************************************/
1133 static uint8_t *GrabCapture( demux_t *p_demux )
1134 {
1135     demux_sys_t *p_sys = p_demux->p_sys;
1136     int i_captured_frame = p_sys->i_frame_pos;
1137
1138     p_sys->vid_mmap.frame = (p_sys->i_frame_pos + 1) % p_sys->vid_mbuf.frames;
1139
1140     while( ioctl( p_sys->i_fd, VIDIOCMCAPTURE, &p_sys->vid_mmap ) < 0 )
1141     {
1142         if( errno != EAGAIN )
1143         {
1144             msg_Err( p_demux, "failed capturing new frame" );
1145             return NULL;
1146         }
1147
1148         if( !vlc_object_alive (p_demux) )
1149         {
1150             return NULL;
1151         }
1152
1153         msg_Dbg( p_demux, "grab failed, trying again" );
1154     }
1155
1156     while( ioctl(p_sys->i_fd, VIDIOCSYNC, &p_sys->i_frame_pos) < 0 )
1157     {
1158         if( errno != EAGAIN && errno != EINTR )
1159         {
1160             msg_Err( p_demux, "failed syncing new frame" );
1161             return NULL;
1162         }
1163     }
1164
1165     p_sys->i_frame_pos = p_sys->vid_mmap.frame;
1166     /* leave i_video_frame_size alone */
1167     return p_sys->p_video_mmap + p_sys->vid_mbuf.offsets[i_captured_frame];
1168 }
1169
1170 static uint8_t *GrabMJPEG( demux_t *p_demux )
1171 {
1172     demux_sys_t *p_sys = p_demux->p_sys;
1173     struct mjpeg_sync sync;
1174     uint8_t *p_frame, *p_field, *p;
1175     uint16_t tag;
1176     uint32_t i_size;
1177     struct quicktime_mjpeg_app1 *p_app1 = NULL;
1178
1179     /* re-queue the last frame we sync'd */
1180     if( p_sys->i_frame_pos != -1 )
1181     {
1182         while( ioctl( p_sys->i_fd, MJPIOC_QBUF_CAPT,
1183                                        &p_sys->i_frame_pos ) < 0 )
1184         {
1185             if( errno != EAGAIN && errno != EINTR )
1186             {
1187                 msg_Err( p_demux, "failed capturing new frame" );
1188                 return NULL;
1189             }
1190         }
1191     }
1192
1193     /* sync on the next frame */
1194     while( ioctl( p_sys->i_fd, MJPIOC_SYNC, &sync ) < 0 )
1195     {
1196         if( errno != EAGAIN && errno != EINTR )
1197         {
1198             msg_Err( p_demux, "failed syncing new frame" );
1199             return NULL;
1200         }
1201     }
1202
1203     p_sys->i_frame_pos = sync.frame;
1204     p_frame = p_sys->p_video_mmap + p_sys->mjpeg_buffers.size * sync.frame;
1205
1206     /* p_frame now points to the data.  fix up the Quicktime APP1 marker */
1207     tag = 0xffd9;
1208     tag = hton16( tag );
1209     p_field = p_frame;
1210
1211     /* look for EOI */
1212     p = memmem( p_field, sync.length, &tag, 2 );
1213
1214     if( p )
1215     {
1216         p += 2; /* data immediately following EOI */
1217         /* UNALIGNED! */
1218         p_app1 = (struct quicktime_mjpeg_app1 *)(p_field + 6);
1219
1220         i_size = ((uint32_t)(p - p_field));
1221         i_size = hton32( i_size );
1222         memcpy( &p_app1->i_field_size, &i_size, 4 );
1223
1224         while( *p == 0xff && *(p+1) == 0xff )
1225             p++;
1226
1227         i_size = ((uint32_t)(p - p_field));
1228         i_size = hton32( i_size );
1229         memcpy( &p_app1->i_padded_field_size, &i_size, 4 );
1230     }
1231
1232     tag = 0xffd8;
1233     tag = hton16( tag );
1234     p_field = memmem( p, sync.length - (size_t)(p - p_frame), &tag, 2 );
1235
1236     if( p_field )
1237     {
1238         i_size = (uint32_t)(p_field - p_frame);
1239         i_size = hton32( i_size );
1240         memcpy( &p_app1->i_next_field, &i_size, 4 );
1241
1242         /* UNALIGNED! */
1243         p_app1 = (struct quicktime_mjpeg_app1 *)(p_field + 6);
1244         tag = 0xffd9;
1245         tag = hton16( tag );
1246         p = memmem( p_field, sync.length - (size_t)(p_field - p_frame),
1247                 &tag, 2 );
1248
1249         if( !p )
1250         {
1251             /* sometimes the second field doesn't have the EOI.  just put it
1252              * there
1253              */
1254             p = p_frame + sync.length;
1255             memcpy( p, &tag, 2 );
1256             sync.length += 2;
1257         }
1258
1259         p += 2;
1260         i_size = (uint32_t)(p - p_field);
1261         i_size = hton32( i_size );
1262         memcpy( &p_app1->i_field_size, &i_size, 4 );
1263         i_size = (uint32_t)(sync.length - (uint32_t)(p_field - p_frame));
1264         i_size = hton32( i_size );
1265         memcpy( &p_app1->i_padded_field_size, &i_size, 4 );
1266     }
1267
1268     p_sys->i_video_frame_size = sync.length;
1269     return p_frame;
1270 }
1271
1272 static block_t *GrabVideo( demux_t *p_demux )
1273 {
1274     demux_sys_t *p_sys = p_demux->p_sys;
1275     uint8_t     *p_frame;
1276     block_t     *p_block;
1277
1278     if( p_sys->f_fps >= 0.1 && p_sys->i_video_pts > 0 )
1279     {
1280         mtime_t i_dur = (mtime_t)((double)1000000 / (double)p_sys->f_fps);
1281
1282         /* Did we wait long enough ? (frame rate reduction) */
1283         if( p_sys->i_video_pts + i_dur > mdate() ) return 0;
1284     }
1285
1286     if( p_sys->b_mjpeg ) p_frame = GrabMJPEG( p_demux );
1287     else p_frame = GrabCapture( p_demux );
1288
1289     if( !p_frame ) return 0;
1290
1291     if( !( p_block = block_New( p_demux, p_sys->i_video_frame_size ) ) )
1292     {
1293         msg_Warn( p_demux, "cannot get block" );
1294         return 0;
1295     }
1296
1297     memcpy( p_block->p_buffer, p_frame, p_sys->i_video_frame_size );
1298     p_sys->i_video_pts = p_block->i_pts = p_block->i_dts = mdate();
1299
1300     return p_block;
1301 }