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 #include <errno.h>
  47
  48 /* From GStreamer's v4l plugin:
  49  * Because of some really cool feature in video4linux1, also known as
  50  * 'not including sys/types.h and sys/time.h', we had to include it
  51  * ourselves. In all their intelligence, these people decided to fix
  52  * this in the next version (video4linux2) in such a cool way that it
  53  * breaks all compilations of old stuff...
  54  * The real problem is actually that linux/time.h doesn't use proper
  55  * macro checks before defining types like struct timeval. The proper
  56  * fix here is to either fuck the kernel header (which is what we do
  57  * by defining _LINUX_TIME_H, an innocent little hack) or by fixing it
  58  * upstream, which I'll consider doing later on. If you get compiler
  59  * errors here, check your linux/time.h && sys/time.h header setup.
  60 */
  61 #define _LINUX_TIME_H
  62
  63 #include <linux/videodev.h>
  64 #include "videodev_mjpeg.h"
  65
  66 /*****************************************************************************
  67  * Module descriptior
  68  *****************************************************************************/
  69 static int  Open ( vlc_object_t * );
  70 static void Close( vlc_object_t * );
  71
  72 #define CACHING_TEXT N_("Caching value in ms")
  73 #define CACHING_LONGTEXT N_( \
  74     "Caching value for V4L captures. This " \
  75     "value should be set in milliseconds." )
  76 #define VDEV_TEXT N_("Video device name")
  77 #define VDEV_LONGTEXT N_( \
  78     "Name of the video device to use. " \
  79     "If you don't specify anything, no video device will be used.")
  80 #define CHROMA_TEXT N_("Video input chroma format")
  81 #define CHROMA_LONGTEXT N_( \
  82     "Force the Video4Linux video device to use a specific chroma format " \
  83     "(eg. I420 (default), RV24, etc.)")
  84 #define FREQUENCY_TEXT N_( "Frequency" )
  85 #define FREQUENCY_LONGTEXT N_( \
  86     "Frequency to capture (in kHz), if applicable." )
  87 #define CHANNEL_TEXT N_( "Channel" )
  88 #define CHANNEL_LONGTEXT N_( \
  89     "Channel of the card to use (Usually, 0 = tuner, " \
  90     "1 = composite, 2 = svideo)." )
  91 #define NORM_TEXT N_( "Norm" )
  92 #define NORM_LONGTEXT N_( \
  93     "Norm of the stream (Automatic, SECAM, PAL, or NTSC)." )
  94 #define AUDIO_TEXT N_( "Audio Channel" )
  95 #define AUDIO_LONGTEXT N_( \
  96     "Audio Channel to use, if there are several audio inputs." )
  97 #define WIDTH_TEXT N_( "Width" )
  98 #define WIDTH_LONGTEXT N_( "Width of the stream to capture " \
  99     "(-1 for autodetect)." )
 100 #define HEIGHT_TEXT N_( "Height" )
 101 #define HEIGHT_LONGTEXT N_( "Height of the stream to capture " \
 102     "(-1 for autodetect)." )
 103 #define BRIGHTNESS_TEXT N_( "Brightness" )
 104 #define BRIGHTNESS_LONGTEXT N_( \
 105     "Brightness of the video input." )
 106 #define HUE_TEXT N_( "Hue" )
 107 #define HUE_LONGTEXT N_( \
 108     "Hue of the video input." )
 109 #define COLOUR_TEXT N_( "Color" )
 110 #define COLOUR_LONGTEXT N_( \
 111     "Color of the video input." )
 112 #define CONTRAST_TEXT N_( "Contrast" )
 113 #define CONTRAST_LONGTEXT N_( \
 114     "Contrast of the video input." )
 115 #define TUNER_TEXT N_( "Tuner" )
 116 #define TUNER_LONGTEXT N_( "Tuner to use, if there are several ones." )
 117 #define MJPEG_TEXT N_( "MJPEG" )
 118 #define MJPEG_LONGTEXT N_(  \
 119     "Set this option if the capture device outputs MJPEG" )
 120 #define DECIMATION_TEXT N_( "Decimation" )
 121 #define DECIMATION_LONGTEXT N_( \
 122     "Decimation level for MJPEG streams" )
 123 #define QUALITY_TEXT N_( "Quality" )
 124 #define QUALITY_LONGTEXT N_( "Quality of the stream." )
 125 #define FPS_TEXT N_( "Framerate" )
 126 #define FPS_LONGTEXT N_( "Framerate to capture, if applicable " \
 127     "(-1 for autodetect)." )
 128
 129 #define AUDIO_DEPRECATED_ERROR N_( \
 130     "Alsa or OSS audio capture in the v4l access is deprecated. " \
 131     "please use 'v4l:/""/ :input-slave=alsa:/""/' or " \
 132     "'v4l:/""/ :input-slave=oss:/""/' instead." )
 133
 134 static const int i_norm_list[] =
 135     { VIDEO_MODE_AUTO, VIDEO_MODE_SECAM, VIDEO_MODE_PAL, VIDEO_MODE_NTSC };
 136 static const char *const psz_norm_list_text[] =
 137     { N_("Automatic"), N_("SECAM"), N_("PAL"),  N_("NTSC") };
 138
 139 #define V4L_DEFAULT "/dev/video"
 140
 141 vlc_module_begin ()
 142     set_shortname( N_("Video4Linux") )
 143     set_description( N_("Video4Linux input") )
 144     set_category( CAT_INPUT )
 145     set_subcategory( SUBCAT_INPUT_ACCESS )
 146
 147     add_integer( "v4l-caching", DEFAULT_PTS_DELAY / 1000, NULL,
 148                  CACHING_TEXT, CACHING_LONGTEXT, true )
 149     add_obsolete_string( "v4l-vdev" );
 150     add_obsolete_string( "v4l-adev" );
 151     add_string( "v4l-chroma", NULL, NULL, CHROMA_TEXT, CHROMA_LONGTEXT,
 152                 true )
 153     add_float( "v4l-fps", -1.0, NULL, FPS_TEXT, FPS_LONGTEXT, true )
 154     add_obsolete_integer( "v4l-samplerate" );
 155     add_integer( "v4l-channel", 0, NULL, CHANNEL_TEXT, CHANNEL_LONGTEXT,
 156                 true )
 157     add_integer( "v4l-tuner", -1, NULL, TUNER_TEXT, TUNER_LONGTEXT, true )
 158     add_integer( "v4l-norm", VIDEO_MODE_AUTO, NULL, NORM_TEXT, NORM_LONGTEXT,
 159                 false )
 160         change_integer_list( i_norm_list, psz_norm_list_text, NULL );
 161     add_integer( "v4l-frequency", -1, NULL, FREQUENCY_TEXT, FREQUENCY_LONGTEXT,
 162                 false )
 163     add_integer( "v4l-audio", -1, NULL, AUDIO_TEXT, AUDIO_LONGTEXT, true )
 164     add_obsolete_bool( "v4l-stereo" );
 165     add_integer( "v4l-width", 0, NULL, WIDTH_TEXT, WIDTH_LONGTEXT, true )
 166     add_integer( "v4l-height", 0, NULL, HEIGHT_TEXT, HEIGHT_LONGTEXT,
 167                 true )
 168     add_integer( "v4l-brightness", -1, NULL, BRIGHTNESS_TEXT,
 169                 BRIGHTNESS_LONGTEXT, true )
 170     add_integer( "v4l-colour", -1, NULL, COLOUR_TEXT, COLOUR_LONGTEXT,
 171                 true )
 172     add_integer( "v4l-hue", -1, NULL, HUE_TEXT, HUE_LONGTEXT, true )
 173     add_integer( "v4l-contrast", -1, NULL, CONTRAST_TEXT, CONTRAST_LONGTEXT,
 174                 true )
 175     add_bool( "v4l-mjpeg", false, NULL, MJPEG_TEXT, MJPEG_LONGTEXT,
 176             true )
 177     add_integer( "v4l-decimation", 1, NULL, DECIMATION_TEXT,
 178             DECIMATION_LONGTEXT, true )
 179     add_integer( "v4l-quality", 100, NULL, QUALITY_TEXT, QUALITY_LONGTEXT,
 180             true )
 181
 182     add_shortcut( "v4l" )
 183     set_capability( "access_demux", 10 )
 184     set_callbacks( Open, Close )
 185 vlc_module_end ()
 186
 187 /*****************************************************************************
 188  * Access: local prototypes
 189  *****************************************************************************/
 190 static int Demux  ( demux_t * );
 191 static int Control( demux_t *, int, va_list );
 192
 193 static void ParseMRL    ( demux_t * );
 194 static int  OpenVideoDev( demux_t *, char * );
 195 static block_t *GrabVideo( demux_t * );
 196
 197 #define MJPEG_BUFFER_SIZE (256*1024)
 198
 199 struct quicktime_mjpeg_app1
 200 {
 201     uint32_t    i_reserved;             /* set to 0 */
 202     uint32_t    i_tag;                  /* 'mjpg' */
 203     uint32_t    i_field_size;           /* offset following EOI */
 204     uint32_t    i_padded_field_size;    /* offset following EOI+pad */
 205     uint32_t    i_next_field;           /* offset to next field */
 206     uint32_t    i_DQT_offset;
 207     uint32_t    i_DHT_offset;
 208     uint32_t    i_SOF_offset;
 209     uint32_t    i_SOS_offset;
 210     uint32_t    i_data_offset;          /* following SOS marker data */
 211 };
 212
 213 static const struct
 214 {
 215     int i_v4l;
 216     vlc_fourcc_t i_fourcc;
 217
 218 } v4lchroma_to_fourcc[] =
 219 {
 220     { VIDEO_PALETTE_GREY, VLC_CODEC_GREY },
 221     { VIDEO_PALETTE_HI240, VLC_FOURCC( 'I', '2', '4', '0' ) },
 222     { VIDEO_PALETTE_RGB565, VLC_CODEC_RGB16 },
 223     { VIDEO_PALETTE_RGB555, VLC_CODEC_RGB15 },
 224     { VIDEO_PALETTE_RGB24, VLC_CODEC_RGB24 },
 225     { VIDEO_PALETTE_RGB32, VLC_CODEC_RGB32 },
 226     { VIDEO_PALETTE_YUV422, VLC_CODEC_YUYV },
 227     { VIDEO_PALETTE_YUYV, VLC_CODEC_YUYV },
 228     { VIDEO_PALETTE_UYVY, VLC_CODEC_UYVY },
 229     { VIDEO_PALETTE_YUV420, VLC_FOURCC( 'I', '4', '2', 'N' ) },
 230     { VIDEO_PALETTE_YUV411, VLC_FOURCC( 'I', '4', '1', 'N' ) },
 231     { VIDEO_PALETTE_RAW, VLC_FOURCC( 'G', 'R', 'A', 'W' ) },
 232     { VIDEO_PALETTE_YUV422P, VLC_CODEC_I422 },
 233     { VIDEO_PALETTE_YUV420P, VLC_CODEC_I420 },
 234     { VIDEO_PALETTE_YUV411P, VLC_CODEC_I411 },
 235     { 0, 0 }
 236 };
 237
 238 struct demux_sys_t
 239 {
 240     /* Devices */
 241     char *psz_device;         /* Main device from MRL */
 242     int  i_fd;
 243
 244     /* Video properties */
 245     picture_t pic;
 246
 247     int i_fourcc;
 248     int i_channel;
 249     int i_audio;
 250     int i_norm;
 251     int i_tuner;
 252     int i_frequency;
 253     int i_width;
 254     int i_height;
 255
 256     int i_brightness;
 257     int i_hue;
 258     int i_colour;
 259     int i_contrast;
 260
 261     float f_fps;            /* <= 0.0 mean to grab at full rate */
 262     mtime_t i_video_pts;    /* only used when f_fps > 0 */
 263
 264     bool b_mjpeg;
 265     int i_decimation;
 266     int i_quality;
 267
 268     struct video_capability vid_cap;
 269     struct video_mbuf       vid_mbuf;
 270     struct mjpeg_requestbuffers mjpeg_buffers;
 271
 272     uint8_t *p_video_mmap;
 273     int     i_frame_pos;
 274
 275     struct video_mmap   vid_mmap;
 276     struct video_picture vid_picture;
 277
 278     int          i_video_frame_size;
 279     es_out_id_t  *p_es;
 280 };
 281
 282 /*****************************************************************************
 283  * Open: opens v4l device
 284  *****************************************************************************
 285  *
 286  * url: <video device>::::
 287  *
 288  *****************************************************************************/
 289 static int Open( vlc_object_t *p_this )
 290 {
 291     demux_t     *p_demux = (demux_t*)p_this;
 292     demux_sys_t *p_sys;
 293
 294     /* Only when selected */
 295     if( *p_demux->psz_access == '\0' )
 296         return VLC_EGENERIC;
 297
 298     /* Set up p_demux */
 299     p_demux->pf_demux = Demux;
 300     p_demux->pf_control = Control;
 301     p_demux->info.i_update = 0;
 302     p_demux->info.i_title = 0;
 303     p_demux->info.i_seekpoint = 0;
 304     p_demux->p_sys = p_sys = calloc( 1, sizeof( demux_sys_t ) );
 305     if( !p_sys )
 306         return VLC_ENOMEM;
 307
 308     p_sys->i_audio      = var_CreateGetInteger( p_demux, "v4l-audio" );
 309     p_sys->i_channel    = var_CreateGetInteger( p_demux, "v4l-channel" );
 310     p_sys->i_norm       = var_CreateGetInteger( p_demux, "v4l-norm" );
 311     p_sys->i_tuner      = var_CreateGetInteger( p_demux, "v4l-tuner" );
 312     p_sys->i_frequency  = var_CreateGetInteger( p_demux, "v4l-frequency" );
 313
 314     p_sys->f_fps        = var_CreateGetFloat( p_demux, "v4l-fps" );
 315     p_sys->i_width      = var_CreateGetInteger( p_demux, "v4l-width" );
 316     p_sys->i_height     = var_CreateGetInteger( p_demux, "v4l-height" );
 317     p_sys->i_video_pts  = -1;
 318     p_sys->i_brightness = var_CreateGetInteger( p_demux, "v4l-brightness" );
 319
 320     p_sys->i_hue        = var_CreateGetInteger( p_demux, "v4l-hue" );
 321     p_sys->i_colour     = var_CreateGetInteger( p_demux, "v4l-colour" );
 322     p_sys->i_contrast   = var_CreateGetInteger( p_demux, "v4l-contrast" );
 323
 324     p_sys->b_mjpeg      = var_CreateGetBool( p_demux, "v4l-mjpeg" );
 325     p_sys->i_decimation = var_CreateGetInteger( p_demux, "v4l-decimation" );
 326     p_sys->i_quality    = var_CreateGetInteger( p_demux, "v4l-quality" );
 327
 328     p_sys->psz_device = NULL;
 329     p_sys->i_fd = -1;
 330
 331     p_sys->p_es = NULL;
 332
 333     ParseMRL( p_demux );
 334
 335     msg_Dbg( p_this, "opening device '%s'", p_sys->psz_device );
 336     p_sys->i_fd = OpenVideoDev( p_demux, p_sys->psz_device );
 337     if( p_sys->i_fd < 0 )
 338     {
 339         Close( p_this );
 340         return VLC_EGENERIC;
 341     }
 342
 343
 344     msg_Dbg( p_demux, "v4l grabbing started" );
 345
 346     /* Declare elementary streams */
 347     es_format_t fmt;
 348     es_format_Init( &fmt, VIDEO_ES, p_sys->i_fourcc );
 349     fmt.video.i_width  = p_sys->i_width;
 350     fmt.video.i_height = p_sys->i_height;
 351     fmt.video.i_aspect = 4 * VOUT_ASPECT_FACTOR / 3;
 352
 353     /* Setup rgb mask for RGB formats */
 354     switch( p_sys->i_fourcc )
 355     {
 356         case VLC_CODEC_RGB15:
 357             fmt.video.i_rmask = 0x001f;
 358             fmt.video.i_gmask = 0x03e0;
 359             fmt.video.i_bmask = 0x7c00;
 360             break;
 361         case VLC_CODEC_RGB16:
 362             fmt.video.i_rmask = 0x001f;
 363             fmt.video.i_gmask = 0x07e0;
 364             fmt.video.i_bmask = 0xf800;
 365             break;
 366         case VLC_CODEC_RGB24:
 367         case VLC_CODEC_RGB32:
 368             fmt.video.i_rmask = 0x00ff0000;
 369             fmt.video.i_gmask = 0x0000ff00;
 370             fmt.video.i_bmask = 0x000000ff;
 371             break;
 372     }
 373
 374     msg_Dbg( p_demux, "added new video es %4.4s %dx%d",
 375              (char*)&fmt.i_codec, fmt.video.i_width, fmt.video.i_height );
 376     p_sys->p_es = es_out_Add( p_demux->out, &fmt );
 377
 378     /* Update default_pts to a suitable value for access */
 379     var_Create( p_demux, "v4l-caching", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 380
 381     return VLC_SUCCESS;
 382 }
 383
 384 /*****************************************************************************
 385  * Close: close device, free resources
 386  *****************************************************************************/
 387 static void Close( vlc_object_t *p_this )
 388 {
 389     demux_t     *p_demux = (demux_t *)p_this;
 390     demux_sys_t *p_sys   = p_demux->p_sys;
 391
 392     free( p_sys->psz_device );
 393     if( p_sys->i_fd >= 0 ) close( p_sys->i_fd );
 394
 395     if( p_sys->b_mjpeg )
 396     {
 397         int i_noframe = -1;
 398         ioctl( p_sys->i_fd, MJPIOC_QBUF_CAPT, &i_noframe );
 399     }
 400
 401     if( p_sys->p_video_mmap && p_sys->p_video_mmap != MAP_FAILED )
 402     {
 403         if( p_sys->b_mjpeg )
 404             munmap( p_sys->p_video_mmap, p_sys->mjpeg_buffers.size *
 405                     p_sys->mjpeg_buffers.count );
 406         else
 407             munmap( p_sys->p_video_mmap, p_sys->vid_mbuf.size );
 408     }
 409
 410     free( p_sys );
 411 }
 412
 413 /*****************************************************************************
 414  * Control:
 415  *****************************************************************************/
 416 static int Control( demux_t *p_demux, int i_query, va_list args )
 417 {
 418     bool *pb;
 419     int64_t    *pi64;
 420
 421     switch( i_query )
 422     {
 423         /* Special for access_demux */
 424         case DEMUX_CAN_PAUSE:
 425         case DEMUX_CAN_SEEK:
 426         case DEMUX_CAN_CONTROL_PACE:
 427             pb = (bool*)va_arg( args, bool * );
 428             *pb = false;
 429             return VLC_SUCCESS;
 430
 431         case DEMUX_GET_PTS_DELAY:
 432             pi64 = (int64_t*)va_arg( args, int64_t * );
 433             *pi64 = (int64_t)var_GetInteger( p_demux, "v4l-caching" ) * 1000;
 434             return VLC_SUCCESS;
 435
 436         case DEMUX_GET_TIME:
 437             pi64 = (int64_t*)va_arg( args, int64_t * );
 438             *pi64 = mdate();
 439             return VLC_SUCCESS;
 440
 441         /* TODO implement others */
 442         default:
 443             return VLC_EGENERIC;
 444     }
 445
 446     return VLC_EGENERIC;
 447 }
 448
 449 /*****************************************************************************
 450  * Demux:
 451  *****************************************************************************/
 452 static int Demux( demux_t *p_demux )
 453 {
 454     demux_sys_t *p_sys = p_demux->p_sys;
 455
 456     block_t *p_block = GrabVideo( p_demux );
 457
 458     if( !p_block )
 459     {
 460         msleep( 10000 ); /* Unfortunately v4l doesn't allow polling */
 461         return 1;
 462     }
 463
 464     es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
 465     es_out_Send( p_demux->out, p_sys->p_es, p_block );
 466
 467     return 1;
 468 }
 469
 470 /*****************************************************************************
 471  * ParseMRL: parse the options contained in the MRL
 472  *****************************************************************************/
 473 static void ParseMRL( demux_t *p_demux )
 474 {
 475     demux_sys_t *p_sys = p_demux->p_sys;
 476
 477     char *psz_dup = strdup( p_demux->psz_path );
 478     char *psz_parser = psz_dup;
 479
 480     while( *psz_parser && *psz_parser != ':' )
 481     {
 482         psz_parser++;
 483     }
 484
 485     if( *psz_parser == ':' )
 486     {
 487         /* read options */
 488         for( ;; )
 489         {
 490             *psz_parser++ = '\0';
 491             if( !strncmp( psz_parser, "channel=", strlen( "channel=" ) ) )
 492             {
 493                 p_sys->i_channel = strtol( psz_parser + strlen( "channel=" ),
 494                                            &psz_parser, 0 );
 495             }
 496             else if( !strncmp( psz_parser, "norm=", strlen( "norm=" ) ) )
 497             {
 498                 psz_parser += strlen( "norm=" );
 499                 if( !strncmp( psz_parser, "pal", strlen( "pal" ) ) )
 500                 {
 501                     p_sys->i_norm = VIDEO_MODE_PAL;
 502                     psz_parser += strlen( "pal" );
 503                 }
 504                 else if( !strncmp( psz_parser, "ntsc", strlen( "ntsc" ) ) )
 505                 {
 506                     p_sys->i_norm = VIDEO_MODE_NTSC;
 507                     psz_parser += strlen( "ntsc" );
 508                 }
 509                 else if( !strncmp( psz_parser, "secam", strlen( "secam" ) ) )
 510                 {
 511                     p_sys->i_norm = VIDEO_MODE_SECAM;
 512                     psz_parser += strlen( "secam" );
 513                 }
 514                 else if( !strncmp( psz_parser, "auto", strlen( "auto" ) ) )
 515                 {
 516                     p_sys->i_norm = VIDEO_MODE_AUTO;
 517                     psz_parser += strlen( "auto" );
 518                 }
 519                 else
 520                 {
 521                     p_sys->i_norm = strtol( psz_parser, &psz_parser, 0 );
 522                 }
 523             }
 524             else if( !strncmp( psz_parser, "frequency=",
 525                                strlen( "frequency=" ) ) )
 526             {
 527                 p_sys->i_frequency =
 528                     strtol( psz_parser + strlen( "frequency=" ),
 529                             &psz_parser, 0 );
 530                 if( p_sys->i_frequency < 30000 )
 531                 {
 532                     msg_Warn( p_demux, "v4l syntax has changed : "
 533                               "'frequency' is now channel frequency in kHz");
 534                 }
 535             }
 536             else if( !strncmp( psz_parser, "audio=", strlen( "audio=" ) ) )
 537             {
 538                 p_sys->i_audio = strtol( psz_parser + strlen( "audio=" ),
 539                                          &psz_parser, 0 );
 540             }
 541             else if( !strncmp( psz_parser, "size=", strlen( "size=" ) ) )
 542             {
 543                 psz_parser += strlen( "size=" );
 544                 if( !strncmp( psz_parser, "subqcif", strlen( "subqcif" ) ) )
 545                 {
 546                     p_sys->i_width  = 128;
 547                     p_sys->i_height = 96;
 548                 }
 549                 else if( !strncmp( psz_parser, "qsif", strlen( "qsif" ) ) )
 550                 {
 551                     p_sys->i_width  = 160;
 552                     p_sys->i_height = 120;
 553                 }
 554                 else if( !strncmp( psz_parser, "qcif", strlen( "qcif" ) ) )
 555                 {
 556                     p_sys->i_width  = 176;
 557                     p_sys->i_height = 144;
 558                 }
 559                 else if( !strncmp( psz_parser, "sif", strlen( "sif" ) ) )
 560                 {
 561                     p_sys->i_width  = 320;
 562                     p_sys->i_height = 244;
 563                 }
 564                 else if( !strncmp( psz_parser, "cif", strlen( "cif" ) ) )
 565                 {
 566                     p_sys->i_width  = 352;
 567                     p_sys->i_height = 288;
 568                 }
 569                 else if( !strncmp( psz_parser, "vga", strlen( "vga" ) ) )
 570                 {
 571                     p_sys->i_width  = 640;
 572                     p_sys->i_height = 480;
 573                 }
 574                 else
 575                 {
 576                     /* widthxheight */
 577                     p_sys->i_width = strtol( psz_parser, &psz_parser, 0 );
 578                     if( *psz_parser == 'x' || *psz_parser == 'X')
 579                     {
 580                         p_sys->i_height = strtol( psz_parser + 1,
 581                                                   &psz_parser, 0 );
 582                     }
 583                     msg_Dbg( p_demux, "WxH %dx%d", p_sys->i_width,
 584                              p_sys->i_height );
 585                 }
 586             }
 587             else if( !strncmp( psz_parser, "brightness=", strlen( "brightness=" ) ) )
 588             {
 589                 p_sys->i_brightness = strtol( psz_parser + strlen( "brightness=" ),
 590                                               &psz_parser, 0 );
 591             }
 592             else if( !strncmp( psz_parser, "colour=", strlen( "colour=" ) ) )
 593             {
 594                 p_sys->i_colour = strtol( psz_parser + strlen( "colour=" ),
 595                                           &psz_parser, 0 );
 596             }
 597             else if( !strncmp( psz_parser, "hue=", strlen( "hue=" ) ) )
 598             {
 599                 p_sys->i_hue = strtol( psz_parser + strlen( "hue=" ),
 600                                        &psz_parser, 0 );
 601             }
 602             else if( !strncmp( psz_parser, "contrast=", strlen( "contrast=" ) ) )
 603             {
 604                 p_sys->i_contrast = strtol( psz_parser + strlen( "contrast=" ),
 605                                             &psz_parser, 0 );
 606             }
 607             else if( !strncmp( psz_parser, "tuner=", strlen( "tuner=" ) ) )
 608             {
 609                 p_sys->i_tuner = strtol( psz_parser + strlen( "tuner=" ),
 610                                          &psz_parser, 0 );
 611             }
 612             else if( !strncmp( psz_parser, "mjpeg", strlen( "mjpeg" ) ) )
 613             {
 614                 psz_parser += strlen( "mjpeg" );
 615
 616                 p_sys->b_mjpeg = true;
 617             }
 618             else if( !strncmp( psz_parser, "decimation=",
 619                         strlen( "decimation=" ) ) )
 620             {
 621                 p_sys->i_decimation =
 622                     strtol( psz_parser + strlen( "decimation=" ),
 623                             &psz_parser, 0 );
 624             }
 625             else if( !strncmp( psz_parser, "quality=",
 626                         strlen( "quality=" ) ) )
 627             {
 628                 p_sys->i_quality =
 629                     strtol( psz_parser + strlen( "quality=" ),
 630                             &psz_parser, 0 );
 631             }
 632             else if( !strncmp( psz_parser, "fps=", strlen( "fps=" ) ) )
 633             {
 634                 p_sys->f_fps = strtof( psz_parser + strlen( "fps=" ),
 635                                        &psz_parser );
 636             }
 637             else if( !strncmp( psz_parser, "adev=", strlen( "adev=" ) )
 638              || !strncmp( psz_parser, "samplerate=", strlen( "samplerate=" ) )
 639              || !strncmp( psz_parser, "stereo", strlen( "stereo" ) )
 640              || !strncmp( psz_parser, "mono", strlen( "mono" ) ) )
 641             {
 642                 if( strchr( psz_parser, ':' ) )
 643                     psz_parser = strchr( psz_parser, ':' );
 644                 else
 645                     psz_parser += strlen( psz_parser );
 646                 msg_Err( p_demux, AUDIO_DEPRECATED_ERROR );
 647             }
 648             else
 649             {
 650                 msg_Warn( p_demux, "unknown option" );
 651             }
 652
 653             while( *psz_parser && *psz_parser != ':' )
 654             {
 655                 psz_parser++;
 656             }
 657
 658             if( *psz_parser == '\0' )
 659             {
 660                 break;
 661             }
 662         }
 663     }
 664
 665     if( *psz_dup )
 666         p_sys->psz_device = strdup( psz_dup );
 667     else
 668         p_sys->psz_device = strdup( V4L_DEFAULT );
 669     free( psz_dup );
 670 }
 671
 672 /*****************************************************************************
 673  * OpenVideoDev:
 674  *****************************************************************************/
 675 static int OpenVideoDev( demux_t *p_demux, char *psz_device )
 676 {
 677     demux_sys_t *p_sys = p_demux->p_sys;
 678     int i_fd;
 679
 680     struct video_channel vid_channel;
 681     struct mjpeg_params mjpeg;
 682     int i;
 683
 684     if( ( i_fd = open( psz_device, O_RDWR ) ) < 0 )
 685     {
 686         msg_Err( p_demux, "cannot open device (%m)" );
 687         goto vdev_failed;
 688     }
 689
 690     if( ioctl( i_fd, VIDIOCGCAP, &p_sys->vid_cap ) < 0 )
 691     {
 692         msg_Err( p_demux, "cannot get capabilities (%m)" );
 693         goto vdev_failed;
 694     }
 695
 696     msg_Dbg( p_demux,
 697              "V4L device %s %d channels %d audios %d < w < %d %d < h < %d",
 698              p_sys->vid_cap.name,
 699              p_sys->vid_cap.channels,
 700              p_sys->vid_cap.audios,
 701              p_sys->vid_cap.minwidth,  p_sys->vid_cap.maxwidth,
 702              p_sys->vid_cap.minheight, p_sys->vid_cap.maxheight );
 703
 704     if( p_sys->i_channel < 0 || p_sys->i_channel >= p_sys->vid_cap.channels )
 705     {
 706         msg_Dbg( p_demux, "invalid channel, falling back on channel 0" );
 707         p_sys->i_channel = 0;
 708     }
 709     if( p_sys->vid_cap.audios && p_sys->i_audio >= p_sys->vid_cap.audios )
 710     {
 711         msg_Dbg( p_demux, "invalid audio, falling back with no audio" );
 712         p_sys->i_audio = -1;
 713     }
 714
 715     if( p_sys->i_width < p_sys->vid_cap.minwidth ||
 716         p_sys->i_width > p_sys->vid_cap.maxwidth )
 717     {
 718         msg_Dbg( p_demux, "invalid width %i", p_sys->i_width );
 719         p_sys->i_width = 0;
 720     }
 721     if( p_sys->i_height < p_sys->vid_cap.minheight ||
 722         p_sys->i_height > p_sys->vid_cap.maxheight )
 723     {
 724         msg_Dbg( p_demux, "invalid height %i", p_sys->i_height );
 725         p_sys->i_height = 0;
 726     }
 727
 728     if( !( p_sys->vid_cap.type & VID_TYPE_CAPTURE ) )
 729     {
 730         msg_Err( p_demux, "cannot grab" );
 731         goto vdev_failed;
 732     }
 733
 734     vid_channel.channel = p_sys->i_channel;
 735     if( ioctl( i_fd, VIDIOCGCHAN, &vid_channel ) < 0 )
 736     {
 737         msg_Err( p_demux, "cannot get channel infos (%m)" );
 738         goto vdev_failed;
 739     }
 740     msg_Dbg( p_demux,
 741              "setting channel %s(%d) %d tuners flags=0x%x type=0x%x norm=0x%x",
 742              vid_channel.name, vid_channel.channel, vid_channel.tuners,
 743              vid_channel.flags, vid_channel.type, vid_channel.norm );
 744
 745     if( p_sys->i_tuner >= vid_channel.tuners )
 746     {
 747         msg_Dbg( p_demux, "invalid tuner, falling back on tuner 0" );
 748         p_sys->i_tuner = 0;
 749     }
 750
 751     vid_channel.norm = p_sys->i_norm;
 752     if( ioctl( i_fd, VIDIOCSCHAN, &vid_channel ) < 0 )
 753     {
 754         msg_Err( p_demux, "cannot set channel (%m)" );
 755         goto vdev_failed;
 756     }
 757
 758     if( vid_channel.flags & VIDEO_VC_TUNER )
 759     {
 760
 761         /* set tuner */
 762 #if 0
 763         struct video_tuner vid_tuner;
 764         if( p_sys->i_tuner >= 0 )
 765         {
 766             vid_tuner.tuner = p_sys->i_tuner;
 767             if( ioctl( i_fd, VIDIOCGTUNER, &vid_tuner ) < 0 )
 768             {
 769                 msg_Err( p_demux, "cannot get tuner (%m)" );
 770                 goto vdev_failed;
 771             }
 772             msg_Dbg( p_demux, "tuner %s low=%d high=%d, flags=0x%x "
 773                      "mode=0x%x signal=0x%x",
 774                      vid_tuner.name, vid_tuner.rangelow, vid_tuner.rangehigh,
 775                      vid_tuner.flags, vid_tuner.mode, vid_tuner.signal );
 776
 777             msg_Dbg( p_demux, "setting tuner %s (%d)",
 778                      vid_tuner.name, vid_tuner.tuner );
 779
 780             /* FIXME FIXME to be checked FIXME FIXME */
 781             //vid_tuner.mode = p_sys->i_norm;
 782             if( ioctl( i_fd, VIDIOCSTUNER, &vid_tuner ) < 0 )
 783             {
 784                 msg_Err( p_demux, "cannot set tuner (%m)" );
 785                 goto vdev_failed;
 786             }
 787         }
 788 #endif
 789
 790         /* Show a warning if frequency is < than 30000.
 791          * User is certainly usint old syntax. */
 792
 793
 794         /* set frequency */
 795         if( p_sys->i_frequency >= 0 )
 796         {
 797             int driver_frequency = p_sys->i_frequency * 16 /1000;
 798             if( ioctl( i_fd, VIDIOCSFREQ, &driver_frequency ) < 0 )
 799             {
 800                 msg_Err( p_demux, "cannot set frequency (%m)" );
 801                 goto vdev_failed;
 802             }
 803             msg_Dbg( p_demux, "frequency %d (%d)", p_sys->i_frequency,
 804                                                    driver_frequency );
 805         }
 806     }
 807
 808     /* set audio */
 809     if( vid_channel.flags & VIDEO_VC_AUDIO )
 810     {
 811         struct video_audio      vid_audio;
 812
 813         /* XXX TODO volume, balance, ... */
 814         if( p_sys->i_audio >= 0 )
 815         {
 816             vid_audio.audio = p_sys->i_audio;
 817             if( ioctl( i_fd, VIDIOCGAUDIO, &vid_audio ) < 0 )
 818             {
 819                 msg_Err( p_demux, "cannot get audio (%m)" );
 820                 goto vdev_failed;
 821             }
 822
 823             /* unmute audio */
 824             vid_audio.flags &= ~VIDEO_AUDIO_MUTE;
 825
 826             if( ioctl( i_fd, VIDIOCSAUDIO, &vid_audio ) < 0 )
 827             {
 828                 msg_Err( p_demux, "cannot set audio (%m)" );
 829                 goto vdev_failed;
 830             }
 831         }
 832
 833     }
 834
 835     /* establish basic params with input and norm before feeling width
 836      * or height */
 837     if( p_sys->b_mjpeg )
 838     {
 839         struct quicktime_mjpeg_app1 *p_app1;
 840         int32_t i_offset;
 841
 842         if( ioctl( i_fd, MJPIOC_G_PARAMS, &mjpeg ) < 0 )
 843         {
 844             msg_Err( p_demux, "cannot get mjpeg params (%m)" );
 845             goto vdev_failed;
 846         }
 847         mjpeg.input = p_sys->i_channel;
 848         mjpeg.norm  = p_sys->i_norm;
 849         mjpeg.decimation = p_sys->i_decimation;
 850
 851         if( p_sys->i_width )
 852             mjpeg.img_width = p_sys->i_width / p_sys->i_decimation;
 853         if( p_sys->i_height )
 854             mjpeg.img_height = p_sys->i_height / p_sys->i_decimation;
 855
 856         /* establish Quicktime APP1 marker while we are here */
 857         mjpeg.APPn = 1;
 858         mjpeg.APP_len = 40;
 859
 860         /* aligned */
 861         p_app1 = (struct quicktime_mjpeg_app1 *)mjpeg.APP_data;
 862         p_app1->i_reserved = 0;
 863         p_app1->i_tag = VLC_FOURCC( 'm','j','p','g' );
 864         p_app1->i_field_size = 0;
 865         p_app1->i_padded_field_size = 0;
 866         p_app1->i_next_field = 0;
 867         /* XXX WARNING XXX */
 868         /* these's nothing magic about these values.  We are dangerously
 869          * assuming the encoder card is encoding mjpeg-a and is not throwing
 870          * in marker tags we aren't expecting.  It's bad enough we have to
 871          * search through the jpeg output for every frame we grab just to
 872          * find the first field's end marker, so we take this risk to boost
 873          * performance.
 874          * This is really something the driver could do for us because this
 875          * does conform to standards outside of Apple Quicktime.
 876          */
 877         i_offset = 0x2e;
 878         p_app1->i_DQT_offset = hton32( i_offset );
 879         i_offset = 0xb4;
 880         p_app1->i_DHT_offset = hton32( i_offset );
 881         i_offset = 0x258;
 882         p_app1->i_SOF_offset = hton32( i_offset );
 883         i_offset = 0x26b;
 884         p_app1->i_SOS_offset = hton32( i_offset );
 885         i_offset = 0x279;
 886         p_app1->i_data_offset = hton32( i_offset );
 887
 888         /* SOF and SOS aren't specified by the mjpeg API because they aren't
 889          * optional.  They will be present in the output. */
 890         mjpeg.jpeg_markers = JPEG_MARKER_DHT | JPEG_MARKER_DQT;
 891
 892         if( ioctl( i_fd, MJPIOC_S_PARAMS, &mjpeg ) < 0 )
 893         {
 894             msg_Err( p_demux, "cannot set mjpeg params (%m)" );
 895             goto vdev_failed;
 896         }
 897
 898         p_sys->i_width = mjpeg.img_width * mjpeg.HorDcm;
 899         p_sys->i_height = mjpeg.img_height * mjpeg.VerDcm *
 900             mjpeg.field_per_buff;
 901     }
 902
 903     /* fix width/height */
 904     if( !p_sys->b_mjpeg && ( p_sys->i_width == 0 || p_sys->i_height == 0 ) )
 905     {
 906         struct video_window vid_win;
 907
 908         if( ioctl( i_fd, VIDIOCGWIN, &vid_win ) < 0 )
 909         {
 910             msg_Err( p_demux, "cannot get win (%m)" );
 911             goto vdev_failed;
 912         }
 913         p_sys->i_width  = vid_win.width;
 914         p_sys->i_height = vid_win.height;
 915
 916         if( !p_sys->i_width || !p_sys->i_height )
 917         {
 918             p_sys->i_width = p_sys->vid_cap.maxwidth;
 919             p_sys->i_height = p_sys->vid_cap.maxheight;
 920         }
 921
 922         if( !p_sys->i_width || !p_sys->i_height )
 923         {
 924             msg_Err( p_demux, "invalid video size (%ix%i)",
 925                      p_sys->i_width, p_sys->i_height );
 926             goto vdev_failed;
 927         }
 928
 929         msg_Dbg( p_demux, "will use %dx%d", p_sys->i_width, p_sys->i_height );
 930     }
 931
 932     if( !p_sys->b_mjpeg )
 933     {
 934         /* set hue/color/.. */
 935         if( ioctl( i_fd, VIDIOCGPICT, &p_sys->vid_picture ) == 0 )
 936         {
 937             struct video_picture vid_picture = p_sys->vid_picture;
 938
 939             if( p_sys->i_brightness >= 0 && p_sys->i_brightness < 65536 )
 940             {
 941                 vid_picture.brightness = p_sys->i_brightness;
 942             }
 943             if( p_sys->i_colour >= 0 && p_sys->i_colour < 65536 )
 944             {
 945                 vid_picture.colour = p_sys->i_colour;
 946             }
 947             if( p_sys->i_hue >= 0 && p_sys->i_hue < 65536 )
 948             {
 949                 vid_picture.hue = p_sys->i_hue;
 950             }
 951             if( p_sys->i_contrast  >= 0 && p_sys->i_contrast < 65536 )
 952             {
 953                 vid_picture.contrast = p_sys->i_contrast;
 954             }
 955             if( ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
 956             {
 957                 msg_Dbg( p_demux, "v4l device uses brightness: %d",
 958                          vid_picture.brightness );
 959                 msg_Dbg( p_demux, "v4l device uses colour: %d",
 960                          vid_picture.colour );
 961                 msg_Dbg( p_demux, "v4l device uses hue: %d", vid_picture.hue );
 962                 msg_Dbg( p_demux, "v4l device uses contrast: %d",
 963                          vid_picture.contrast );
 964                 p_sys->vid_picture = vid_picture;
 965             }
 966         }
 967
 968         /* Find out video format used by device */
 969         if( ioctl( i_fd, VIDIOCGPICT, &p_sys->vid_picture ) == 0 )
 970         {
 971             struct video_picture vid_picture = p_sys->vid_picture;
 972             char *psz;
 973             int i;
 974
 975             p_sys->i_fourcc = 0;
 976
 977             psz = var_CreateGetString( p_demux, "v4l-chroma" );
 978
 979             const vlc_fourcc_t i_chroma =
 980                 vlc_fourcc_GetCodecFromString( VIDEO_ES, psz );
 981             if( i_chroma )
 982             {
 983                 vid_picture.palette = 0;
 984
 985                 /* Find out v4l chroma code */
 986                 for( i = 0; v4lchroma_to_fourcc[i].i_v4l != 0; i++ )
 987                 {
 988                     if( v4lchroma_to_fourcc[i].i_fourcc == i_chroma )
 989                     {
 990                         vid_picture.palette = v4lchroma_to_fourcc[i].i_v4l;
 991                         break;
 992                     }
 993                 }
 994             }
 995             free( psz );
 996
 997             if( vid_picture.palette &&
 998                 !ioctl( i_fd, VIDIOCSPICT, &vid_picture ) )
 999             {
1000                 p_sys->vid_picture = vid_picture;
1001             }
1002             else
1003             {
1004                 /* Try to set the format to something easy to encode */
1005                 vid_picture.palette = VIDEO_PALETTE_YUV420P;
1006                 if( ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
1007                 {
1008                     p_sys->vid_picture = vid_picture;
1009                 }
1010                 else
1011                 {
1012                     vid_picture.palette = VIDEO_PALETTE_YUV422P;
1013                     if( ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
1014                     {
1015                         p_sys->vid_picture = vid_picture;
1016                     }
1017                 }
1018             }
1019
1020             /* Find out final format */
1021             for( i = 0; v4lchroma_to_fourcc[i].i_v4l != 0; i++ )
1022             {
1023                 if( v4lchroma_to_fourcc[i].i_v4l == p_sys->vid_picture.palette)
1024                 {
1025                     p_sys->i_fourcc = v4lchroma_to_fourcc[i].i_fourcc;
1026                     break;
1027                 }
1028             }
1029         }
1030         else
1031         {
1032             msg_Err( p_demux, "ioctl VIDIOCGPICT failed" );
1033             goto vdev_failed;
1034         }
1035     }
1036
1037     if( p_sys->b_mjpeg )
1038     {
1039         int i;
1040
1041         p_sys->mjpeg_buffers.count = 8;
1042         p_sys->mjpeg_buffers.size = MJPEG_BUFFER_SIZE;
1043
1044         if( ioctl( i_fd, MJPIOC_REQBUFS, &p_sys->mjpeg_buffers ) < 0 )
1045         {
1046             msg_Err( p_demux, "mmap unsupported" );
1047             goto vdev_failed;
1048         }
1049
1050         p_sys->p_video_mmap = mmap( 0,
1051                 p_sys->mjpeg_buffers.size * p_sys->mjpeg_buffers.count,
1052                 PROT_READ | PROT_WRITE, MAP_SHARED, i_fd, 0 );
1053         if( p_sys->p_video_mmap == MAP_FAILED )
1054         {
1055             msg_Err( p_demux, "mmap failed" );
1056             goto vdev_failed;
1057         }
1058
1059         p_sys->i_fourcc  = VLC_CODEC_MJPG;
1060         p_sys->i_frame_pos = -1;
1061
1062         /* queue up all the frames */
1063         for( i = 0; i < (int)p_sys->mjpeg_buffers.count; i++ )
1064         {
1065             if( ioctl( i_fd, MJPIOC_QBUF_CAPT, &i ) < 0 )
1066             {
1067                 msg_Err( p_demux, "unable to queue frame" );
1068                 goto vdev_failed;
1069             }
1070         }
1071     }
1072     else
1073     {
1074         /* Fill in picture_t fields */
1075         if( picture_Setup( &p_sys->pic, p_sys->i_fourcc,
1076                            p_sys->i_width, p_sys->i_height, p_sys->i_width *
1077                            VOUT_ASPECT_FACTOR / p_sys->i_height ) )
1078         {
1079             msg_Err( p_demux, "unsupported chroma" );
1080             goto vdev_failed;
1081         }
1082         p_sys->i_video_frame_size = 0;
1083         for( i = 0; i < p_sys->pic.i_planes; i++ )
1084         {
1085             p_sys->i_video_frame_size += p_sys->pic.p[i].i_visible_lines *
1086               p_sys->pic.p[i].i_visible_pitch;
1087         }
1088
1089         msg_Dbg( p_demux, "v4l device uses frame size: %i",
1090                  p_sys->i_video_frame_size );
1091         msg_Dbg( p_demux, "v4l device uses chroma: %4.4s",
1092                 (char*)&p_sys->i_fourcc );
1093
1094         /* Allocate mmap buffer */
1095         if( ioctl( i_fd, VIDIOCGMBUF, &p_sys->vid_mbuf ) < 0 )
1096         {
1097             msg_Err( p_demux, "mmap unsupported" );
1098             goto vdev_failed;
1099         }
1100
1101         p_sys->p_video_mmap = mmap( 0, p_sys->vid_mbuf.size,
1102                                     PROT_READ|PROT_WRITE, MAP_SHARED,
1103                                     i_fd, 0 );
1104         if( p_sys->p_video_mmap == MAP_FAILED )
1105         {
1106             /* FIXME -> normal read */
1107             msg_Err( p_demux, "mmap failed" );
1108             goto vdev_failed;
1109         }
1110
1111         /* init grabbing */
1112         p_sys->vid_mmap.frame  = 0;
1113         p_sys->vid_mmap.width  = p_sys->i_width;
1114         p_sys->vid_mmap.height = p_sys->i_height;
1115         p_sys->vid_mmap.format = p_sys->vid_picture.palette;
1116         if( ioctl( i_fd, VIDIOCMCAPTURE, &p_sys->vid_mmap ) < 0 )
1117         {
1118             msg_Warn( p_demux, "%4.4s refused", (char*)&p_sys->i_fourcc );
1119             msg_Err( p_demux, "chroma selection failed" );
1120             goto vdev_failed;
1121         }
1122     }
1123     return i_fd;
1124
1125 vdev_failed:
1126
1127     if( i_fd >= 0 ) close( i_fd );
1128     return -1;
1129 }
1130
1131 /*****************************************************************************
1132  * GrabVideo:
1133  *****************************************************************************/
1134 static uint8_t *GrabCapture( demux_t *p_demux )
1135 {
1136     demux_sys_t *p_sys = p_demux->p_sys;
1137     int i_captured_frame = p_sys->i_frame_pos;
1138
1139     p_sys->vid_mmap.frame = (p_sys->i_frame_pos + 1) % p_sys->vid_mbuf.frames;
1140
1141     while( ioctl( p_sys->i_fd, VIDIOCMCAPTURE, &p_sys->vid_mmap ) < 0 )
1142     {
1143         if( errno != EAGAIN )
1144         {
1145             msg_Err( p_demux, "failed capturing new frame" );
1146             return NULL;
1147         }
1148
1149         if( !vlc_object_alive (p_demux) )
1150         {
1151             return NULL;
1152         }
1153
1154         msg_Dbg( p_demux, "grab failed, trying again" );
1155     }
1156
1157     while( ioctl(p_sys->i_fd, VIDIOCSYNC, &p_sys->i_frame_pos) < 0 )
1158     {
1159         if( errno != EAGAIN && errno != EINTR )
1160         {
1161             msg_Err( p_demux, "failed syncing new frame" );
1162             return NULL;
1163         }
1164     }
1165
1166     p_sys->i_frame_pos = p_sys->vid_mmap.frame;
1167     /* leave i_video_frame_size alone */
1168     return p_sys->p_video_mmap + p_sys->vid_mbuf.offsets[i_captured_frame];
1169 }
1170
1171 static uint8_t *GrabMJPEG( demux_t *p_demux )
1172 {
1173     demux_sys_t *p_sys = p_demux->p_sys;
1174     struct mjpeg_sync sync;
1175     uint8_t *p_frame, *p_field, *p;
1176     uint16_t tag;
1177     uint32_t i_size;
1178     struct quicktime_mjpeg_app1 *p_app1 = NULL;
1179
1180     /* re-queue the last frame we sync'd */
1181     if( p_sys->i_frame_pos != -1 )
1182     {
1183         while( ioctl( p_sys->i_fd, MJPIOC_QBUF_CAPT,
1184                                        &p_sys->i_frame_pos ) < 0 )
1185         {
1186             if( errno != EAGAIN && errno != EINTR )
1187             {
1188                 msg_Err( p_demux, "failed capturing new frame" );
1189                 return NULL;
1190             }
1191         }
1192     }
1193
1194     /* sync on the next frame */
1195     while( ioctl( p_sys->i_fd, MJPIOC_SYNC, &sync ) < 0 )
1196     {
1197         if( errno != EAGAIN && errno != EINTR )
1198         {
1199             msg_Err( p_demux, "failed syncing new frame" );
1200             return NULL;
1201         }
1202     }
1203
1204     p_sys->i_frame_pos = sync.frame;
1205     p_frame = p_sys->p_video_mmap + p_sys->mjpeg_buffers.size * sync.frame;
1206
1207     /* p_frame now points to the data.  fix up the Quicktime APP1 marker */
1208     tag = 0xffd9;
1209     tag = hton16( tag );
1210     p_field = p_frame;
1211
1212     /* look for EOI */
1213     p = memmem( p_field, sync.length, &tag, 2 );
1214
1215     if( p )
1216     {
1217         p += 2; /* data immediately following EOI */
1218         /* UNALIGNED! */
1219         p_app1 = (struct quicktime_mjpeg_app1 *)(p_field + 6);
1220
1221         i_size = ((uint32_t)(p - p_field));
1222         i_size = hton32( i_size );
1223         memcpy( &p_app1->i_field_size, &i_size, 4 );
1224
1225         while( *p == 0xff && *(p+1) == 0xff )
1226             p++;
1227
1228         i_size = ((uint32_t)(p - p_field));
1229         i_size = hton32( i_size );
1230         memcpy( &p_app1->i_padded_field_size, &i_size, 4 );
1231     }
1232
1233     tag = 0xffd8;
1234     tag = hton16( tag );
1235     p_field = memmem( p, sync.length - (size_t)(p - p_frame), &tag, 2 );
1236
1237     if( p_field )
1238     {
1239         i_size = (uint32_t)(p_field - p_frame);
1240         i_size = hton32( i_size );
1241         memcpy( &p_app1->i_next_field, &i_size, 4 );
1242
1243         /* UNALIGNED! */
1244         p_app1 = (struct quicktime_mjpeg_app1 *)(p_field + 6);
1245         tag = 0xffd9;
1246         tag = hton16( tag );
1247         p = memmem( p_field, sync.length - (size_t)(p_field - p_frame),
1248                 &tag, 2 );
1249
1250         if( !p )
1251         {
1252             /* sometimes the second field doesn't have the EOI.  just put it
1253              * there
1254              */
1255             p = p_frame + sync.length;
1256             memcpy( p, &tag, 2 );
1257             sync.length += 2;
1258         }
1259
1260         p += 2;
1261         i_size = (uint32_t)(p - p_field);
1262         i_size = hton32( i_size );
1263         memcpy( &p_app1->i_field_size, &i_size, 4 );
1264         i_size = (uint32_t)(sync.length - (uint32_t)(p_field - p_frame));
1265         i_size = hton32( i_size );
1266         memcpy( &p_app1->i_padded_field_size, &i_size, 4 );
1267     }
1268
1269     p_sys->i_video_frame_size = sync.length;
1270     return p_frame;
1271 }
1272
1273 static block_t *GrabVideo( demux_t *p_demux )
1274 {
1275     demux_sys_t *p_sys = p_demux->p_sys;
1276     uint8_t     *p_frame;
1277     block_t     *p_block;
1278
1279     if( p_sys->f_fps >= 0.1 && p_sys->i_video_pts > 0 )
1280     {
1281         mtime_t i_dur = (mtime_t)((double)1000000 / (double)p_sys->f_fps);
1282
1283         /* Did we wait long enough ? (frame rate reduction) */
1284         if( p_sys->i_video_pts + i_dur > mdate() ) return 0;
1285     }
1286
1287     if( p_sys->b_mjpeg ) p_frame = GrabMJPEG( p_demux );
1288     else p_frame = GrabCapture( p_demux );
1289
1290     if( !p_frame ) return 0;
1291
1292     if( !( p_block = block_New( p_demux, p_sys->i_video_frame_size ) ) )
1293     {
1294         msg_Warn( p_demux, "cannot get block" );
1295         return 0;
1296     }
1297
1298     memcpy( p_block->p_buffer, p_frame, p_sys->i_video_frame_size );
1299     p_sys->i_video_pts = p_block->i_pts = p_block->i_dts = mdate();
1300
1301     return p_block;
1302 }