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_vout.h>
  41
  42 #include <sys/ioctl.h>
  43 #include <sys/mman.h>
  44 #include <fcntl.h>
  45 #include <arpa/inet.h>
  46
  47 #include <poll.h>
  48
  49 /* From GStreamer's v4l plugin:
  50  * Because of some really cool feature in video4linux1, also known as
  51  * 'not including sys/types.h and sys/time.h', we had to include it
  52  * ourselves. In all their intelligence, these people decided to fix
  53  * this in the next version (video4linux2) in such a cool way that it
  54  * breaks all compilations of old stuff...
  55  * The real problem is actually that linux/time.h doesn't use proper
  56  * macro checks before defining types like struct timeval. The proper
  57  * fix here is to either fuck the kernel header (which is what we do
  58  * by defining _LINUX_TIME_H, an innocent little hack) or by fixing it
  59  * upstream, which I'll consider doing later on. If you get compiler
  60  * errors here, check your linux/time.h && sys/time.h header setup.
  61 */
  62 #define _LINUX_TIME_H
  63
  64 #include <linux/videodev.h>
  65 #include "videodev_mjpeg.h"
  66
  67 /*****************************************************************************
  68  * Module descriptior
  69  *****************************************************************************/
  70 static int  Open ( vlc_object_t * );
  71 static void Close( vlc_object_t * );
  72
  73 #define CACHING_TEXT N_("Caching value in ms")
  74 #define CACHING_LONGTEXT N_( \
  75     "Caching value for V4L captures. This " \
  76     "value should be set in milliseconds." )
  77 #define VDEV_TEXT N_("Video device name")
  78 #define VDEV_LONGTEXT N_( \
  79     "Name of the video device to use. " \
  80     "If you don't specify anything, no video device will be used.")
  81 #define CHROMA_TEXT N_("Video input chroma format")
  82 #define CHROMA_LONGTEXT N_( \
  83     "Force the Video4Linux video device to use a specific chroma format " \
  84     "(eg. I420 (default), RV24, etc.)")
  85 #define FREQUENCY_TEXT N_( "Frequency" )
  86 #define FREQUENCY_LONGTEXT N_( \
  87     "Frequency to capture (in kHz), if applicable." )
  88 #define CHANNEL_TEXT N_( "Channel" )
  89 #define CHANNEL_LONGTEXT N_( \
  90     "Channel of the card to use (Usually, 0 = tuner, " \
  91     "1 = composite, 2 = svideo)." )
  92 #define NORM_TEXT N_( "Norm" )
  93 #define NORM_LONGTEXT N_( \
  94     "Norm of the stream (Automatic, SECAM, PAL, or NTSC)." )
  95 #define AUDIO_TEXT N_( "Audio Channel" )
  96 #define AUDIO_LONGTEXT N_( \
  97     "Audio Channel to use, if there are several audio inputs." )
  98 #define WIDTH_TEXT N_( "Width" )
  99 #define WIDTH_LONGTEXT N_( "Width of the stream to capture " \
 100     "(-1 for autodetect)." )
 101 #define HEIGHT_TEXT N_( "Height" )
 102 #define HEIGHT_LONGTEXT N_( "Height of the stream to capture " \
 103     "(-1 for autodetect)." )
 104 #define BRIGHTNESS_TEXT N_( "Brightness" )
 105 #define BRIGHTNESS_LONGTEXT N_( \
 106     "Brightness of the video input." )
 107 #define HUE_TEXT N_( "Hue" )
 108 #define HUE_LONGTEXT N_( \
 109     "Hue of the video input." )
 110 #define COLOUR_TEXT N_( "Color" )
 111 #define COLOUR_LONGTEXT N_( \
 112     "Color of the video input." )
 113 #define CONTRAST_TEXT N_( "Contrast" )
 114 #define CONTRAST_LONGTEXT N_( \
 115     "Contrast of the video input." )
 116 #define TUNER_TEXT N_( "Tuner" )
 117 #define TUNER_LONGTEXT N_( "Tuner to use, if there are several ones." )
 118 #define MJPEG_TEXT N_( "MJPEG" )
 119 #define MJPEG_LONGTEXT N_(  \
 120     "Set this option if the capture device outputs MJPEG" )
 121 #define DECIMATION_TEXT N_( "Decimation" )
 122 #define DECIMATION_LONGTEXT N_( \
 123     "Decimation level for MJPEG streams" )
 124 #define QUALITY_TEXT N_( "Quality" )
 125 #define QUALITY_LONGTEXT N_( "Quality of the stream." )
 126 #define FPS_TEXT N_( "Framerate" )
 127 #define FPS_LONGTEXT N_( "Framerate to capture, if applicable " \
 128     "(-1 for autodetect)." )
 129
 130 #define AUDIO_DEPRECATED_ERROR N_( \
 131     "Alsa or OSS audio capture in the v4l access is deprecated. " \
 132     "please use 'v4l:/""/ :input-slave=alsa:/""/' or " \
 133     "'v4l:/""/ :input-slave=oss:/""/' instead." )
 134
 135 static const int i_norm_list[] =
 136     { VIDEO_MODE_AUTO, VIDEO_MODE_SECAM, VIDEO_MODE_PAL, VIDEO_MODE_NTSC };
 137 static const char *const psz_norm_list_text[] =
 138     { N_("Automatic"), N_("SECAM"), N_("PAL"),  N_("NTSC") };
 139
 140 #define V4L_DEFAULT "/dev/video"
 141
 142 vlc_module_begin ()
 143     set_shortname( N_("Video4Linux") )
 144     set_description( N_("Video4Linux input") )
 145     set_category( CAT_INPUT )
 146     set_subcategory( SUBCAT_INPUT_ACCESS )
 147
 148     add_integer( "v4l-caching", DEFAULT_PTS_DELAY / 1000, NULL,
 149                  CACHING_TEXT, CACHING_LONGTEXT, true );
 150     add_obsolete_string( "v4l-vdev" );
 151     add_obsolete_string( "v4l-adev" );
 152     add_string( "v4l-chroma", NULL, NULL, CHROMA_TEXT, CHROMA_LONGTEXT,
 153                 true );
 154     add_float( "v4l-fps", -1.0, NULL, FPS_TEXT, FPS_LONGTEXT, true )
 155     add_obsolete_integer( "v4l-samplerate" );
 156     add_integer( "v4l-channel", 0, NULL, CHANNEL_TEXT, CHANNEL_LONGTEXT,
 157                 true );
 158     add_integer( "v4l-tuner", -1, NULL, TUNER_TEXT, TUNER_LONGTEXT, true )
 159     add_integer( "v4l-norm", VIDEO_MODE_AUTO, NULL, NORM_TEXT, NORM_LONGTEXT,
 160                 false );
 161         change_integer_list( i_norm_list, psz_norm_list_text, NULL );
 162     add_integer( "v4l-frequency", -1, NULL, FREQUENCY_TEXT, FREQUENCY_LONGTEXT,
 163                 false );
 164     add_integer( "v4l-audio", -1, NULL, AUDIO_TEXT, AUDIO_LONGTEXT, true )
 165     add_obsolete_bool( "v4l-stereo" );
 166     add_integer( "v4l-width", 0, NULL, WIDTH_TEXT, WIDTH_LONGTEXT, true )
 167     add_integer( "v4l-height", 0, NULL, HEIGHT_TEXT, HEIGHT_LONGTEXT,
 168                 true );
 169     add_integer( "v4l-brightness", -1, NULL, BRIGHTNESS_TEXT,
 170                 BRIGHTNESS_LONGTEXT, true );
 171     add_integer( "v4l-colour", -1, NULL, COLOUR_TEXT, COLOUR_LONGTEXT,
 172                 true );
 173     add_integer( "v4l-hue", -1, NULL, HUE_TEXT, HUE_LONGTEXT, true )
 174     add_integer( "v4l-contrast", -1, NULL, CONTRAST_TEXT, CONTRAST_LONGTEXT,
 175                 true );
 176     add_bool( "v4l-mjpeg", false, NULL, MJPEG_TEXT, MJPEG_LONGTEXT,
 177             true );
 178     add_integer( "v4l-decimation", 1, NULL, DECIMATION_TEXT,
 179             DECIMATION_LONGTEXT, true );
 180     add_integer( "v4l-quality", 100, NULL, QUALITY_TEXT, QUALITY_LONGTEXT,
 181             true );
 182
 183     add_shortcut( "v4l" )
 184     set_capability( "access_demux", 10 )
 185     set_callbacks( Open, Close )
 186 vlc_module_end ()
 187
 188 /*****************************************************************************
 189  * Access: local prototypes
 190  *****************************************************************************/
 191 static int Demux  ( demux_t * );
 192 static int Control( demux_t *, int, va_list );
 193
 194 static void ParseMRL    ( demux_t * );
 195 static int  OpenVideoDev( demux_t *, char * );
 196 static block_t *GrabVideo( demux_t * );
 197
 198 #define MJPEG_BUFFER_SIZE (256*1024)
 199
 200 struct quicktime_mjpeg_app1
 201 {
 202     uint32_t    i_reserved;             /* set to 0 */
 203     uint32_t    i_tag;                  /* 'mjpg' */
 204     uint32_t    i_field_size;           /* offset following EOI */
 205     uint32_t    i_padded_field_size;    /* offset following EOI+pad */
 206     uint32_t    i_next_field;           /* offset to next field */
 207     uint32_t    i_DQT_offset;
 208     uint32_t    i_DHT_offset;
 209     uint32_t    i_SOF_offset;
 210     uint32_t    i_SOS_offset;
 211     uint32_t    i_data_offset;          /* following SOS marker data */
 212 };
 213
 214 static const struct
 215 {
 216     int i_v4l;
 217     int i_fourcc;
 218
 219 } v4lchroma_to_fourcc[] =
 220 {
 221     { VIDEO_PALETTE_GREY, VLC_FOURCC( 'G', 'R', 'E', 'Y' ) },
 222     { VIDEO_PALETTE_HI240, VLC_FOURCC( 'I', '2', '4', '0' ) },
 223     { VIDEO_PALETTE_RGB565, VLC_FOURCC( 'R', 'V', '1', '6' ) },
 224     { VIDEO_PALETTE_RGB555, VLC_FOURCC( 'R', 'V', '1', '5' ) },
 225     { VIDEO_PALETTE_RGB24, VLC_FOURCC( 'R', 'V', '2', '4' ) },
 226     { VIDEO_PALETTE_RGB32, VLC_FOURCC( 'R', 'V', '3', '2' ) },
 227     { VIDEO_PALETTE_YUV422, VLC_FOURCC( 'Y', 'U', 'Y', '2' ) },
 228     { VIDEO_PALETTE_YUV422, VLC_FOURCC( 'Y', 'U', 'Y', 'V' ) },
 229     { VIDEO_PALETTE_YUYV, VLC_FOURCC( 'Y', 'U', 'Y', '2' ) },
 230     { VIDEO_PALETTE_YUYV, VLC_FOURCC( 'Y', 'U', 'Y', 'V' ) },
 231     { VIDEO_PALETTE_UYVY, VLC_FOURCC( 'U', 'Y', 'V', 'Y' ) },
 232     { VIDEO_PALETTE_YUV420, VLC_FOURCC( 'I', '4', '2', 'N' ) },
 233     { VIDEO_PALETTE_YUV411, VLC_FOURCC( 'I', '4', '1', 'N' ) },
 234     { VIDEO_PALETTE_RAW, VLC_FOURCC( 'G', 'R', 'A', 'W' ) },
 235     { VIDEO_PALETTE_YUV422P, VLC_FOURCC( 'I', '4', '2', '2' ) },
 236     { VIDEO_PALETTE_YUV420P, VLC_FOURCC( 'I', '4', '2', '0' ) },
 237     { VIDEO_PALETTE_YUV411P, VLC_FOURCC( 'I', '4', '1', '1' ) },
 238     { 0, 0 }
 239 };
 240
 241 struct demux_sys_t
 242 {
 243     /* Devices */
 244     char *psz_device;         /* Main device from MRL */
 245     int  i_fd;
 246
 247     /* Video properties */
 248     picture_t pic;
 249
 250     int i_fourcc;
 251     int i_channel;
 252     int i_audio;
 253     int i_norm;
 254     int i_tuner;
 255     int i_frequency;
 256     int i_width;
 257     int i_height;
 258
 259     int i_brightness;
 260     int i_hue;
 261     int i_colour;
 262     int i_contrast;
 263
 264     float f_fps;            /* <= 0.0 mean to grab at full rate */
 265     mtime_t i_video_pts;    /* only used when f_fps > 0 */
 266
 267     bool b_mjpeg;
 268     int i_decimation;
 269     int i_quality;
 270
 271     struct video_capability vid_cap;
 272     struct video_mbuf       vid_mbuf;
 273     struct mjpeg_requestbuffers mjpeg_buffers;
 274
 275     uint8_t *p_video_mmap;
 276     int     i_frame_pos;
 277
 278     struct video_mmap   vid_mmap;
 279     struct video_picture vid_picture;
 280
 281     int          i_video_frame_size;
 282     es_out_id_t  *p_es;
 283 };
 284
 285 /*****************************************************************************
 286  * Open: opens v4l device
 287  *****************************************************************************
 288  *
 289  * url: <video device>::::
 290  *
 291  *****************************************************************************/
 292 static int Open( vlc_object_t *p_this )
 293 {
 294     demux_t     *p_demux = (demux_t*)p_this;
 295     demux_sys_t *p_sys;
 296     vlc_value_t val;
 297
 298     /* Only when selected */
 299     if( *p_demux->psz_access == '\0' )
 300         return VLC_EGENERIC;
 301
 302     /* Set up p_demux */
 303     p_demux->pf_demux = Demux;
 304     p_demux->pf_control = Control;
 305     p_demux->info.i_update = 0;
 306     p_demux->info.i_title = 0;
 307     p_demux->info.i_seekpoint = 0;
 308     p_demux->p_sys = p_sys = calloc( 1, sizeof( demux_sys_t ) );
 309     if( !p_sys )
 310         return VLC_ENOMEM;
 311
 312     var_Create( p_demux, "v4l-audio", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 313     var_Get( p_demux, "v4l-audio", &val );
 314     p_sys->i_audio          = val.i_int;
 315
 316     var_Create( p_demux, "v4l-channel", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 317     var_Get( p_demux, "v4l-channel", &val );
 318     p_sys->i_channel        = val.i_int;
 319
 320     var_Create( p_demux, "v4l-norm", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 321     var_Get( p_demux, "v4l-norm", &val );
 322     p_sys->i_norm           = val.i_int;
 323
 324     var_Create( p_demux, "v4l-tuner", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 325     var_Get( p_demux, "v4l-tuner", &val );
 326     p_sys->i_tuner          = val.i_int;
 327
 328     var_Create( p_demux, "v4l-frequency",
 329                                     VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 330     var_Get( p_demux, "v4l-frequency", &val );
 331     p_sys->i_frequency      = val.i_int;
 332
 333     var_Create( p_demux, "v4l-fps", VLC_VAR_FLOAT | VLC_VAR_DOINHERIT );
 334     var_Get( p_demux, "v4l-fps", &val );
 335     p_sys->f_fps            = val.f_float;
 336
 337     var_Create( p_demux, "v4l-width", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 338     var_Get( p_demux, "v4l-width", &val );
 339     p_sys->i_width          = val.i_int;
 340
 341     var_Create( p_demux, "v4l-height", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 342     var_Get( p_demux, "v4l-height", &val );
 343     p_sys->i_height         = val.i_int;
 344
 345     p_sys->i_video_pts      = -1;
 346
 347     var_Create( p_demux, "v4l-brightness", VLC_VAR_INTEGER |
 348                                                         VLC_VAR_DOINHERIT );
 349     var_Get( p_demux, "v4l-brightness", &val );
 350     p_sys->i_brightness     = val.i_int;
 351
 352     var_Create( p_demux, "v4l-hue", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 353     var_Get( p_demux, "v4l-hue", &val );
 354     p_sys->i_hue            = -1;
 355
 356     var_Create( p_demux, "v4l-colour", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 357     var_Get( p_demux, "v4l-colour", &val );
 358     p_sys->i_colour         = val.i_int;
 359
 360     var_Create( p_demux, "v4l-contrast", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 361     var_Get( p_demux, "v4l-contrast", &val );
 362     p_sys->i_contrast       = val.i_int;
 363
 364     var_Create( p_demux, "v4l-mjpeg", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
 365     var_Get( p_demux, "v4l-mjpeg", &val );
 366     p_sys->b_mjpeg     = val.b_bool;
 367
 368     var_Create( p_demux, "v4l-decimation", VLC_VAR_INTEGER |
 369                                                             VLC_VAR_DOINHERIT );
 370     var_Get( p_demux, "v4l-decimation", &val );
 371     p_sys->i_decimation = val.i_int;
 372
 373     var_Create( p_demux, "v4l-quality", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 374     var_Get( p_demux, "v4l-quality", &val );
 375     p_sys->i_quality = val.i_int;
 376
 377     p_sys->psz_device = NULL;
 378     p_sys->i_fd = -1;
 379
 380     p_sys->p_es = NULL;
 381
 382     ParseMRL( p_demux );
 383
 384     msg_Dbg( p_this, "opening device '%s'", p_sys->psz_device );
 385     p_sys->i_fd = OpenVideoDev( p_demux, p_sys->psz_device );
 386     if( p_sys->i_fd < 0 )
 387     {
 388         Close( p_this );
 389         return VLC_EGENERIC;
 390     }
 391
 392
 393     msg_Dbg( p_demux, "v4l grabbing started" );
 394
 395     /* Declare elementary streams */
 396     es_format_t fmt;
 397     es_format_Init( &fmt, VIDEO_ES, p_sys->i_fourcc );
 398     fmt.video.i_width  = p_sys->i_width;
 399     fmt.video.i_height = p_sys->i_height;
 400     fmt.video.i_aspect = 4 * VOUT_ASPECT_FACTOR / 3;
 401
 402     /* Setup rgb mask for RGB formats */
 403     switch( p_sys->i_fourcc )
 404     {
 405         case VLC_FOURCC('R','V','1','5'):
 406             fmt.video.i_rmask = 0x001f;
 407             fmt.video.i_gmask = 0x03e0;
 408             fmt.video.i_bmask = 0x7c00;
 409             break;
 410         case VLC_FOURCC('R','V','1','6'):
 411             fmt.video.i_rmask = 0x001f;
 412             fmt.video.i_gmask = 0x07e0;
 413             fmt.video.i_bmask = 0xf800;
 414             break;
 415         case VLC_FOURCC('R','V','2','4'):
 416         case VLC_FOURCC('R','V','3','2'):
 417             fmt.video.i_rmask = 0x00ff0000;
 418             fmt.video.i_gmask = 0x0000ff00;
 419             fmt.video.i_bmask = 0x000000ff;
 420             break;
 421     }
 422
 423     msg_Dbg( p_demux, "added new video es %4.4s %dx%d",
 424              (char*)&fmt.i_codec, fmt.video.i_width, fmt.video.i_height );
 425     p_sys->p_es = es_out_Add( p_demux->out, &fmt );
 426
 427     /* Update default_pts to a suitable value for access */
 428     var_Create( p_demux, "v4l-caching", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 429
 430     return VLC_SUCCESS;
 431 }
 432
 433 /*****************************************************************************
 434  * Close: close device, free resources
 435  *****************************************************************************/
 436 static void Close( vlc_object_t *p_this )
 437 {
 438     demux_t     *p_demux = (demux_t *)p_this;
 439     demux_sys_t *p_sys   = p_demux->p_sys;
 440
 441     free( p_sys->psz_device );
 442     if( p_sys->i_fd >= 0 ) close( p_sys->i_fd );
 443
 444     if( p_sys->b_mjpeg )
 445     {
 446         int i_noframe = -1;
 447         ioctl( p_sys->i_fd, MJPIOC_QBUF_CAPT, &i_noframe );
 448     }
 449
 450     if( p_sys->p_video_mmap && p_sys->p_video_mmap != MAP_FAILED )
 451     {
 452         if( p_sys->b_mjpeg )
 453             munmap( p_sys->p_video_mmap, p_sys->mjpeg_buffers.size *
 454                     p_sys->mjpeg_buffers.count );
 455         else
 456             munmap( p_sys->p_video_mmap, p_sys->vid_mbuf.size );
 457     }
 458
 459     free( p_sys );
 460 }
 461
 462 /*****************************************************************************
 463  * Control:
 464  *****************************************************************************/
 465 static int Control( demux_t *p_demux, int i_query, va_list args )
 466 {
 467     bool *pb;
 468     int64_t    *pi64;
 469
 470     switch( i_query )
 471     {
 472         /* Special for access_demux */
 473         case DEMUX_CAN_PAUSE:
 474         case DEMUX_CAN_SEEK:
 475         case DEMUX_SET_PAUSE_STATE:
 476         case DEMUX_CAN_CONTROL_PACE:
 477             pb = (bool*)va_arg( args, bool * );
 478             *pb = false;
 479             return VLC_SUCCESS;
 480
 481         case DEMUX_GET_PTS_DELAY:
 482             pi64 = (int64_t*)va_arg( args, int64_t * );
 483             *pi64 = (int64_t)var_GetInteger( p_demux, "v4l-caching" ) * 1000;
 484             return VLC_SUCCESS;
 485
 486         case DEMUX_GET_TIME:
 487             pi64 = (int64_t*)va_arg( args, int64_t * );
 488             *pi64 = mdate();
 489             return VLC_SUCCESS;
 490
 491         /* TODO implement others */
 492         default:
 493             return VLC_EGENERIC;
 494     }
 495
 496     return VLC_EGENERIC;
 497 }
 498
 499 /*****************************************************************************
 500  * Demux:
 501  *****************************************************************************/
 502 static int Demux( demux_t *p_demux )
 503 {
 504     demux_sys_t *p_sys = p_demux->p_sys;
 505
 506     struct pollfd fd;
 507     fd.fd = p_sys->i_fd;
 508     fd.events = POLLIN|POLLPRI;
 509     fd.revents = 0;
 510
 511     /* Wait for data */
 512     if( poll( &fd, 1, 500 ) )
 513     {
 514         if( fd.revents & (POLLIN|POLLPRI) )
 515         {
 516             block_t *p_block = GrabVideo( p_demux );
 517             if( p_block )
 518             {
 519                 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
 520                 es_out_Send( p_demux->out, p_sys->p_es, p_block );
 521             }
 522         }
 523     }
 524
 525     return 1;
 526 }
 527
 528 /*****************************************************************************
 529  * ParseMRL: parse the options contained in the MRL
 530  *****************************************************************************/
 531 static void ParseMRL( demux_t *p_demux )
 532 {
 533     demux_sys_t *p_sys = p_demux->p_sys;
 534
 535     char *psz_dup = strdup( p_demux->psz_path );
 536     char *psz_parser = psz_dup;
 537
 538     while( *psz_parser && *psz_parser != ':' )
 539     {
 540         psz_parser++;
 541     }
 542
 543     if( *psz_parser == ':' )
 544     {
 545         /* read options */
 546         for( ;; )
 547         {
 548             *psz_parser++ = '\0';
 549             if( !strncmp( psz_parser, "channel=", strlen( "channel=" ) ) )
 550             {
 551                 p_sys->i_channel = strtol( psz_parser + strlen( "channel=" ),
 552                                            &psz_parser, 0 );
 553             }
 554             else if( !strncmp( psz_parser, "norm=", strlen( "norm=" ) ) )
 555             {
 556                 psz_parser += strlen( "norm=" );
 557                 if( !strncmp( psz_parser, "pal", strlen( "pal" ) ) )
 558                 {
 559                     p_sys->i_norm = VIDEO_MODE_PAL;
 560                     psz_parser += strlen( "pal" );
 561                 }
 562                 else if( !strncmp( psz_parser, "ntsc", strlen( "ntsc" ) ) )
 563                 {
 564                     p_sys->i_norm = VIDEO_MODE_NTSC;
 565                     psz_parser += strlen( "ntsc" );
 566                 }
 567                 else if( !strncmp( psz_parser, "secam", strlen( "secam" ) ) )
 568                 {
 569                     p_sys->i_norm = VIDEO_MODE_SECAM;
 570                     psz_parser += strlen( "secam" );
 571                 }
 572                 else if( !strncmp( psz_parser, "auto", strlen( "auto" ) ) )
 573                 {
 574                     p_sys->i_norm = VIDEO_MODE_AUTO;
 575                     psz_parser += strlen( "auto" );
 576                 }
 577                 else
 578                 {
 579                     p_sys->i_norm = strtol( psz_parser, &psz_parser, 0 );
 580                 }
 581             }
 582             else if( !strncmp( psz_parser, "frequency=",
 583                                strlen( "frequency=" ) ) )
 584             {
 585                 p_sys->i_frequency =
 586                     strtol( psz_parser + strlen( "frequency=" ),
 587                             &psz_parser, 0 );
 588                 if( p_sys->i_frequency < 30000 )
 589                 {
 590                     msg_Warn( p_demux, "v4l syntax has changed : "
 591                               "'frequency' is now channel frequency in kHz");
 592                 }
 593             }
 594             else if( !strncmp( psz_parser, "audio=", strlen( "audio=" ) ) )
 595             {
 596                 p_sys->i_audio = strtol( psz_parser + strlen( "audio=" ),
 597                                          &psz_parser, 0 );
 598             }
 599             else if( !strncmp( psz_parser, "size=", strlen( "size=" ) ) )
 600             {
 601                 psz_parser += strlen( "size=" );
 602                 if( !strncmp( psz_parser, "subqcif", strlen( "subqcif" ) ) )
 603                 {
 604                     p_sys->i_width  = 128;
 605                     p_sys->i_height = 96;
 606                 }
 607                 else if( !strncmp( psz_parser, "qsif", strlen( "qsif" ) ) )
 608                 {
 609                     p_sys->i_width  = 160;
 610                     p_sys->i_height = 120;
 611                 }
 612                 else if( !strncmp( psz_parser, "qcif", strlen( "qcif" ) ) )
 613                 {
 614                     p_sys->i_width  = 176;
 615                     p_sys->i_height = 144;
 616                 }
 617                 else if( !strncmp( psz_parser, "sif", strlen( "sif" ) ) )
 618                 {
 619                     p_sys->i_width  = 320;
 620                     p_sys->i_height = 244;
 621                 }
 622                 else if( !strncmp( psz_parser, "cif", strlen( "cif" ) ) )
 623                 {
 624                     p_sys->i_width  = 352;
 625                     p_sys->i_height = 288;
 626                 }
 627                 else if( !strncmp( psz_parser, "vga", strlen( "vga" ) ) )
 628                 {
 629                     p_sys->i_width  = 640;
 630                     p_sys->i_height = 480;
 631                 }
 632                 else
 633                 {
 634                     /* widthxheight */
 635                     p_sys->i_width = strtol( psz_parser, &psz_parser, 0 );
 636                     if( *psz_parser == 'x' || *psz_parser == 'X')
 637                     {
 638                         p_sys->i_height = strtol( psz_parser + 1,
 639                                                   &psz_parser, 0 );
 640                     }
 641                     msg_Dbg( p_demux, "WxH %dx%d", p_sys->i_width,
 642                              p_sys->i_height );
 643                 }
 644             }
 645             else if( !strncmp( psz_parser, "brightness=", strlen( "brightness=" ) ) )
 646             {
 647                 p_sys->i_brightness = strtol( psz_parser + strlen( "brightness=" ),
 648                                               &psz_parser, 0 );
 649             }
 650             else if( !strncmp( psz_parser, "colour=", strlen( "colour=" ) ) )
 651             {
 652                 p_sys->i_colour = strtol( psz_parser + strlen( "colour=" ),
 653                                           &psz_parser, 0 );
 654             }
 655             else if( !strncmp( psz_parser, "hue=", strlen( "hue=" ) ) )
 656             {
 657                 p_sys->i_hue = strtol( psz_parser + strlen( "hue=" ),
 658                                        &psz_parser, 0 );
 659             }
 660             else if( !strncmp( psz_parser, "contrast=", strlen( "contrast=" ) ) )
 661             {
 662                 p_sys->i_contrast = strtol( psz_parser + strlen( "contrast=" ),
 663                                             &psz_parser, 0 );
 664             }
 665             else if( !strncmp( psz_parser, "tuner=", strlen( "tuner=" ) ) )
 666             {
 667                 p_sys->i_tuner = strtol( psz_parser + strlen( "tuner=" ),
 668                                          &psz_parser, 0 );
 669             }
 670             else if( !strncmp( psz_parser, "mjpeg", strlen( "mjpeg" ) ) )
 671             {
 672                 psz_parser += strlen( "mjpeg" );
 673
 674                 p_sys->b_mjpeg = true;
 675             }
 676             else if( !strncmp( psz_parser, "decimation=",
 677                         strlen( "decimation=" ) ) )
 678             {
 679                 p_sys->i_decimation =
 680                     strtol( psz_parser + strlen( "decimation=" ),
 681                             &psz_parser, 0 );
 682             }
 683             else if( !strncmp( psz_parser, "quality=",
 684                         strlen( "quality=" ) ) )
 685             {
 686                 p_sys->i_quality =
 687                     strtol( psz_parser + strlen( "quality=" ),
 688                             &psz_parser, 0 );
 689             }
 690             else if( !strncmp( psz_parser, "fps=", strlen( "fps=" ) ) )
 691             {
 692                 p_sys->f_fps = strtof( psz_parser + strlen( "fps=" ),
 693                                        &psz_parser );
 694             }
 695             else if( !strncmp( psz_parser, "adev=", strlen( "adev=" ) )
 696              || !strncmp( psz_parser, "samplerate=", strlen( "samplerate=" ) )
 697              || !strncmp( psz_parser, "stereo", strlen( "stereo" ) )
 698              || !strncmp( psz_parser, "mono", strlen( "mono" ) ) )
 699             {
 700                 if( strchr( psz_parser, ':' ) )
 701                     psz_parser = strchr( psz_parser, ':' );
 702                 else
 703                     psz_parser += strlen( psz_parser );
 704                 msg_Err( p_demux, AUDIO_DEPRECATED_ERROR );
 705             }
 706             else
 707             {
 708                 msg_Warn( p_demux, "unknown option" );
 709             }
 710
 711             while( *psz_parser && *psz_parser != ':' )
 712             {
 713                 psz_parser++;
 714             }
 715
 716             if( *psz_parser == '\0' )
 717             {
 718                 break;
 719             }
 720         }
 721     }
 722
 723     if( *psz_dup )
 724         p_sys->psz_device = strdup( psz_dup );
 725     else
 726         p_sys->psz_device = strdup( V4L_DEFAULT );
 727     free( psz_dup );
 728 }
 729
 730 /*****************************************************************************
 731  * OpenVideoDev:
 732  *****************************************************************************/
 733 static int OpenVideoDev( demux_t *p_demux, char *psz_device )
 734 {
 735     demux_sys_t *p_sys = p_demux->p_sys;
 736     int i_fd;
 737
 738     struct video_channel vid_channel;
 739     struct mjpeg_params mjpeg;
 740     int i;
 741
 742     if( ( i_fd = open( psz_device, O_RDWR ) ) < 0 )
 743     {
 744         msg_Err( p_demux, "cannot open device (%m)" );
 745         goto vdev_failed;
 746     }
 747
 748     if( ioctl( i_fd, VIDIOCGCAP, &p_sys->vid_cap ) < 0 )
 749     {
 750         msg_Err( p_demux, "cannot get capabilities (%m)" );
 751         goto vdev_failed;
 752     }
 753
 754     msg_Dbg( p_demux,
 755              "V4L device %s %d channels %d audios %d < w < %d %d < h < %d",
 756              p_sys->vid_cap.name,
 757              p_sys->vid_cap.channels,
 758              p_sys->vid_cap.audios,
 759              p_sys->vid_cap.minwidth,  p_sys->vid_cap.maxwidth,
 760              p_sys->vid_cap.minheight, p_sys->vid_cap.maxheight );
 761
 762     if( p_sys->i_channel < 0 || p_sys->i_channel >= p_sys->vid_cap.channels )
 763     {
 764         msg_Dbg( p_demux, "invalid channel, falling back on channel 0" );
 765         p_sys->i_channel = 0;
 766     }
 767     if( p_sys->vid_cap.audios && p_sys->i_audio >= p_sys->vid_cap.audios )
 768     {
 769         msg_Dbg( p_demux, "invalid audio, falling back with no audio" );
 770         p_sys->i_audio = -1;
 771     }
 772
 773     if( p_sys->i_width < p_sys->vid_cap.minwidth ||
 774         p_sys->i_width > p_sys->vid_cap.maxwidth )
 775     {
 776         msg_Dbg( p_demux, "invalid width %i", p_sys->i_width );
 777         p_sys->i_width = 0;
 778     }
 779     if( p_sys->i_height < p_sys->vid_cap.minheight ||
 780         p_sys->i_height > p_sys->vid_cap.maxheight )
 781     {
 782         msg_Dbg( p_demux, "invalid height %i", p_sys->i_height );
 783         p_sys->i_height = 0;
 784     }
 785
 786     if( !( p_sys->vid_cap.type & VID_TYPE_CAPTURE ) )
 787     {
 788         msg_Err( p_demux, "cannot grab" );
 789         goto vdev_failed;
 790     }
 791
 792     vid_channel.channel = p_sys->i_channel;
 793     if( ioctl( i_fd, VIDIOCGCHAN, &vid_channel ) < 0 )
 794     {
 795         msg_Err( p_demux, "cannot get channel infos (%m)" );
 796         goto vdev_failed;
 797     }
 798     msg_Dbg( p_demux,
 799              "setting channel %s(%d) %d tuners flags=0x%x type=0x%x norm=0x%x",
 800              vid_channel.name, vid_channel.channel, vid_channel.tuners,
 801              vid_channel.flags, vid_channel.type, vid_channel.norm );
 802
 803     if( p_sys->i_tuner >= vid_channel.tuners )
 804     {
 805         msg_Dbg( p_demux, "invalid tuner, falling back on tuner 0" );
 806         p_sys->i_tuner = 0;
 807     }
 808
 809     vid_channel.norm = p_sys->i_norm;
 810     if( ioctl( i_fd, VIDIOCSCHAN, &vid_channel ) < 0 )
 811     {
 812         msg_Err( p_demux, "cannot set channel (%m)" );
 813         goto vdev_failed;
 814     }
 815
 816     if( vid_channel.flags & VIDEO_VC_TUNER )
 817     {
 818
 819         /* set tuner */
 820 #if 0
 821         struct video_tuner vid_tuner;
 822         if( p_sys->i_tuner >= 0 )
 823         {
 824             vid_tuner.tuner = p_sys->i_tuner;
 825             if( ioctl( i_fd, VIDIOCGTUNER, &vid_tuner ) < 0 )
 826             {
 827                 msg_Err( p_demux, "cannot get tuner (%m)" );
 828                 goto vdev_failed;
 829             }
 830             msg_Dbg( p_demux, "tuner %s low=%d high=%d, flags=0x%x "
 831                      "mode=0x%x signal=0x%x",
 832                      vid_tuner.name, vid_tuner.rangelow, vid_tuner.rangehigh,
 833                      vid_tuner.flags, vid_tuner.mode, vid_tuner.signal );
 834
 835             msg_Dbg( p_demux, "setting tuner %s (%d)",
 836                      vid_tuner.name, vid_tuner.tuner );
 837
 838             /* FIXME FIXME to be checked FIXME FIXME */
 839             //vid_tuner.mode = p_sys->i_norm;
 840             if( ioctl( i_fd, VIDIOCSTUNER, &vid_tuner ) < 0 )
 841             {
 842                 msg_Err( p_demux, "cannot set tuner (%m)" );
 843                 goto vdev_failed;
 844             }
 845         }
 846 #endif
 847
 848         /* Show a warning if frequency is < than 30000.
 849          * User is certainly usint old syntax. */
 850
 851
 852         /* set frequency */
 853         if( p_sys->i_frequency >= 0 )
 854         {
 855             int driver_frequency = p_sys->i_frequency * 16 /1000;
 856             if( ioctl( i_fd, VIDIOCSFREQ, &driver_frequency ) < 0 )
 857             {
 858                 msg_Err( p_demux, "cannot set frequency (%m)" );
 859                 goto vdev_failed;
 860             }
 861             msg_Dbg( p_demux, "frequency %d (%d)", p_sys->i_frequency,
 862                                                    driver_frequency );
 863         }
 864     }
 865
 866     /* set audio */
 867     if( vid_channel.flags & VIDEO_VC_AUDIO )
 868     {
 869         struct video_audio      vid_audio;
 870
 871         /* XXX TODO volume, balance, ... */
 872         if( p_sys->i_audio >= 0 )
 873         {
 874             vid_audio.audio = p_sys->i_audio;
 875             if( ioctl( i_fd, VIDIOCGAUDIO, &vid_audio ) < 0 )
 876             {
 877                 msg_Err( p_demux, "cannot get audio (%m)" );
 878                 goto vdev_failed;
 879             }
 880
 881             /* unmute audio */
 882             vid_audio.flags &= ~VIDEO_AUDIO_MUTE;
 883
 884             if( ioctl( i_fd, VIDIOCSAUDIO, &vid_audio ) < 0 )
 885             {
 886                 msg_Err( p_demux, "cannot set audio (%m)" );
 887                 goto vdev_failed;
 888             }
 889         }
 890
 891     }
 892
 893     /* establish basic params with input and norm before feeling width
 894      * or height */
 895     if( p_sys->b_mjpeg )
 896     {
 897         struct quicktime_mjpeg_app1 *p_app1;
 898         int32_t i_offset;
 899
 900         if( ioctl( i_fd, MJPIOC_G_PARAMS, &mjpeg ) < 0 )
 901         {
 902             msg_Err( p_demux, "cannot get mjpeg params (%m)" );
 903             goto vdev_failed;
 904         }
 905         mjpeg.input = p_sys->i_channel;
 906         mjpeg.norm  = p_sys->i_norm;
 907         mjpeg.decimation = p_sys->i_decimation;
 908
 909         if( p_sys->i_width )
 910             mjpeg.img_width = p_sys->i_width / p_sys->i_decimation;
 911         if( p_sys->i_height )
 912             mjpeg.img_height = p_sys->i_height / p_sys->i_decimation;
 913
 914         /* establish Quicktime APP1 marker while we are here */
 915         mjpeg.APPn = 1;
 916         mjpeg.APP_len = 40;
 917
 918         /* aligned */
 919         p_app1 = (struct quicktime_mjpeg_app1 *)mjpeg.APP_data;
 920         p_app1->i_reserved = 0;
 921         p_app1->i_tag = VLC_FOURCC( 'm','j','p','g' );
 922         p_app1->i_field_size = 0;
 923         p_app1->i_padded_field_size = 0;
 924         p_app1->i_next_field = 0;
 925         /* XXX WARNING XXX */
 926         /* these's nothing magic about these values.  We are dangerously
 927          * assuming the encoder card is encoding mjpeg-a and is not throwing
 928          * in marker tags we aren't expecting.  It's bad enough we have to
 929          * search through the jpeg output for every frame we grab just to
 930          * find the first field's end marker, so we take this risk to boost
 931          * performance.
 932          * This is really something the driver could do for us because this
 933          * does conform to standards outside of Apple Quicktime.
 934          */
 935         i_offset = 0x2e;
 936         p_app1->i_DQT_offset = hton32( i_offset );
 937         i_offset = 0xb4;
 938         p_app1->i_DHT_offset = hton32( i_offset );
 939         i_offset = 0x258;
 940         p_app1->i_SOF_offset = hton32( i_offset );
 941         i_offset = 0x26b;
 942         p_app1->i_SOS_offset = hton32( i_offset );
 943         i_offset = 0x279;
 944         p_app1->i_data_offset = hton32( i_offset );
 945
 946         /* SOF and SOS aren't specified by the mjpeg API because they aren't
 947          * optional.  They will be present in the output. */
 948         mjpeg.jpeg_markers = JPEG_MARKER_DHT | JPEG_MARKER_DQT;
 949
 950         if( ioctl( i_fd, MJPIOC_S_PARAMS, &mjpeg ) < 0 )
 951         {
 952             msg_Err( p_demux, "cannot set mjpeg params (%m)" );
 953             goto vdev_failed;
 954         }
 955
 956         p_sys->i_width = mjpeg.img_width * mjpeg.HorDcm;
 957         p_sys->i_height = mjpeg.img_height * mjpeg.VerDcm *
 958             mjpeg.field_per_buff;
 959     }
 960
 961     /* fix width/height */
 962     if( !p_sys->b_mjpeg && ( p_sys->i_width == 0 || p_sys->i_height == 0 ) )
 963     {
 964         struct video_window vid_win;
 965
 966         if( ioctl( i_fd, VIDIOCGWIN, &vid_win ) < 0 )
 967         {
 968             msg_Err( p_demux, "cannot get win (%m)" );
 969             goto vdev_failed;
 970         }
 971         p_sys->i_width  = vid_win.width;
 972         p_sys->i_height = vid_win.height;
 973
 974         if( !p_sys->i_width || !p_sys->i_height )
 975         {
 976             p_sys->i_width = p_sys->vid_cap.maxwidth;
 977             p_sys->i_height = p_sys->vid_cap.maxheight;
 978         }
 979
 980         if( !p_sys->i_width || !p_sys->i_height )
 981         {
 982             msg_Err( p_demux, "invalid video size (%ix%i)",
 983                      p_sys->i_width, p_sys->i_height );
 984             goto vdev_failed;
 985         }
 986
 987         msg_Dbg( p_demux, "will use %dx%d", p_sys->i_width, p_sys->i_height );
 988     }
 989
 990     if( !p_sys->b_mjpeg )
 991     {
 992         /* set hue/color/.. */
 993         if( ioctl( i_fd, VIDIOCGPICT, &p_sys->vid_picture ) == 0 )
 994         {
 995             struct video_picture vid_picture = p_sys->vid_picture;
 996
 997             if( p_sys->i_brightness >= 0 && p_sys->i_brightness < 65536 )
 998             {
 999                 vid_picture.brightness = p_sys->i_brightness;
1000             }
1001             if( p_sys->i_colour >= 0 && p_sys->i_colour < 65536 )
1002             {
1003                 vid_picture.colour = p_sys->i_colour;
1004             }
1005             if( p_sys->i_hue >= 0 && p_sys->i_hue < 65536 )
1006             {
1007                 vid_picture.hue = p_sys->i_hue;
1008             }
1009             if( p_sys->i_contrast  >= 0 && p_sys->i_contrast < 65536 )
1010             {
1011                 vid_picture.contrast = p_sys->i_contrast;
1012             }
1013             if( ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
1014             {
1015                 msg_Dbg( p_demux, "v4l device uses brightness: %d",
1016                          vid_picture.brightness );
1017                 msg_Dbg( p_demux, "v4l device uses colour: %d",
1018                          vid_picture.colour );
1019                 msg_Dbg( p_demux, "v4l device uses hue: %d", vid_picture.hue );
1020                 msg_Dbg( p_demux, "v4l device uses contrast: %d",
1021                          vid_picture.contrast );
1022                 p_sys->vid_picture = vid_picture;
1023             }
1024         }
1025
1026         /* Find out video format used by device */
1027         if( ioctl( i_fd, VIDIOCGPICT, &p_sys->vid_picture ) == 0 )
1028         {
1029             struct video_picture vid_picture = p_sys->vid_picture;
1030             char *psz;
1031             int i;
1032
1033             p_sys->i_fourcc = 0;
1034
1035             psz = var_CreateGetString( p_demux, "v4l-chroma" );
1036             if( strlen( psz ) >= 4 )
1037             {
1038                 vid_picture.palette = 0;
1039                 int i_chroma = VLC_FOURCC( psz[0], psz[1], psz[2], psz[3] );
1040
1041                 /* Find out v4l chroma code */
1042                 for( i = 0; v4lchroma_to_fourcc[i].i_v4l != 0; i++ )
1043                 {
1044                     if( v4lchroma_to_fourcc[i].i_fourcc == i_chroma )
1045                     {
1046                         vid_picture.palette = v4lchroma_to_fourcc[i].i_v4l;
1047                         break;
1048                     }
1049                 }
1050             }
1051             free( psz );
1052
1053             if( vid_picture.palette &&
1054                 !ioctl( i_fd, VIDIOCSPICT, &vid_picture ) )
1055             {
1056                 p_sys->vid_picture = vid_picture;
1057             }
1058             else
1059             {
1060                 /* Try to set the format to something easy to encode */
1061                 vid_picture.palette = VIDEO_PALETTE_YUV420P;
1062                 if( ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
1063                 {
1064                     p_sys->vid_picture = vid_picture;
1065                 }
1066                 else
1067                 {
1068                     vid_picture.palette = VIDEO_PALETTE_YUV422P;
1069                     if( ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
1070                     {
1071                         p_sys->vid_picture = vid_picture;
1072                     }
1073                 }
1074             }
1075
1076             /* Find out final format */
1077             for( i = 0; v4lchroma_to_fourcc[i].i_v4l != 0; i++ )
1078             {
1079                 if( v4lchroma_to_fourcc[i].i_v4l == p_sys->vid_picture.palette)
1080                 {
1081                     p_sys->i_fourcc = v4lchroma_to_fourcc[i].i_fourcc;
1082                     break;
1083                 }
1084             }
1085         }
1086         else
1087         {
1088             msg_Err( p_demux, "ioctl VIDIOCGPICT failed" );
1089             goto vdev_failed;
1090         }
1091     }
1092
1093     if( p_sys->b_mjpeg )
1094     {
1095         int i;
1096
1097         p_sys->mjpeg_buffers.count = 8;
1098         p_sys->mjpeg_buffers.size = MJPEG_BUFFER_SIZE;
1099
1100         if( ioctl( i_fd, MJPIOC_REQBUFS, &p_sys->mjpeg_buffers ) < 0 )
1101         {
1102             msg_Err( p_demux, "mmap unsupported" );
1103             goto vdev_failed;
1104         }
1105
1106         p_sys->p_video_mmap = mmap( 0,
1107                 p_sys->mjpeg_buffers.size * p_sys->mjpeg_buffers.count,
1108                 PROT_READ | PROT_WRITE, MAP_SHARED, i_fd, 0 );
1109         if( p_sys->p_video_mmap == MAP_FAILED )
1110         {
1111             msg_Err( p_demux, "mmap failed" );
1112             goto vdev_failed;
1113         }
1114
1115         p_sys->i_fourcc  = VLC_FOURCC( 'm','j','p','g' );
1116         p_sys->i_frame_pos = -1;
1117
1118         /* queue up all the frames */
1119         for( i = 0; i < (int)p_sys->mjpeg_buffers.count; i++ )
1120         {
1121             if( ioctl( i_fd, MJPIOC_QBUF_CAPT, &i ) < 0 )
1122             {
1123                 msg_Err( p_demux, "unable to queue frame" );
1124                 goto vdev_failed;
1125             }
1126         }
1127     }
1128     else
1129     {
1130         /* Fill in picture_t fields */
1131         vout_InitPicture( VLC_OBJECT(p_demux), &p_sys->pic, p_sys->i_fourcc,
1132                           p_sys->i_width, p_sys->i_height, p_sys->i_width *
1133                           VOUT_ASPECT_FACTOR / p_sys->i_height );
1134         if( !p_sys->pic.i_planes )
1135         {
1136             msg_Err( p_demux, "unsupported chroma" );
1137             goto vdev_failed;
1138         }
1139         p_sys->i_video_frame_size = 0;
1140         for( i = 0; i < p_sys->pic.i_planes; i++ )
1141         {
1142             p_sys->i_video_frame_size += p_sys->pic.p[i].i_visible_lines *
1143               p_sys->pic.p[i].i_visible_pitch;
1144         }
1145
1146         msg_Dbg( p_demux, "v4l device uses frame size: %i",
1147                  p_sys->i_video_frame_size );
1148         msg_Dbg( p_demux, "v4l device uses chroma: %4.4s",
1149                 (char*)&p_sys->i_fourcc );
1150
1151         /* Allocate mmap buffer */
1152         if( ioctl( i_fd, VIDIOCGMBUF, &p_sys->vid_mbuf ) < 0 )
1153         {
1154             msg_Err( p_demux, "mmap unsupported" );
1155             goto vdev_failed;
1156         }
1157
1158         p_sys->p_video_mmap = mmap( 0, p_sys->vid_mbuf.size,
1159                                     PROT_READ|PROT_WRITE, MAP_SHARED,
1160                                     i_fd, 0 );
1161         if( p_sys->p_video_mmap == MAP_FAILED )
1162         {
1163             /* FIXME -> normal read */
1164             msg_Err( p_demux, "mmap failed" );
1165             goto vdev_failed;
1166         }
1167
1168         /* init grabbing */
1169         p_sys->vid_mmap.frame  = 0;
1170         p_sys->vid_mmap.width  = p_sys->i_width;
1171         p_sys->vid_mmap.height = p_sys->i_height;
1172         p_sys->vid_mmap.format = p_sys->vid_picture.palette;
1173         if( ioctl( i_fd, VIDIOCMCAPTURE, &p_sys->vid_mmap ) < 0 )
1174         {
1175             msg_Warn( p_demux, "%4.4s refused", (char*)&p_sys->i_fourcc );
1176             msg_Err( p_demux, "chroma selection failed" );
1177             goto vdev_failed;
1178         }
1179     }
1180     return i_fd;
1181
1182 vdev_failed:
1183
1184     if( i_fd >= 0 ) close( i_fd );
1185     return -1;
1186 }
1187
1188 /*****************************************************************************
1189  * GrabVideo:
1190  *****************************************************************************/
1191 static uint8_t *GrabCapture( demux_t *p_demux )
1192 {
1193     demux_sys_t *p_sys = p_demux->p_sys;
1194     int i_captured_frame = p_sys->i_frame_pos;
1195
1196     p_sys->vid_mmap.frame = (p_sys->i_frame_pos + 1) % p_sys->vid_mbuf.frames;
1197
1198     while( ioctl( p_sys->i_fd, VIDIOCMCAPTURE, &p_sys->vid_mmap ) < 0 )
1199     {
1200         if( errno != EAGAIN )
1201         {
1202             msg_Err( p_demux, "failed capturing new frame" );
1203             return NULL;
1204         }
1205
1206         if( !vlc_object_alive (p_demux) )
1207         {
1208             return NULL;
1209         }
1210
1211         msg_Dbg( p_demux, "grab failed, trying again" );
1212     }
1213
1214     while( ioctl(p_sys->i_fd, VIDIOCSYNC, &p_sys->i_frame_pos) < 0 )
1215     {
1216         if( errno != EAGAIN && errno != EINTR )
1217         {
1218             msg_Err( p_demux, "failed syncing new frame" );
1219             return NULL;
1220         }
1221     }
1222
1223     p_sys->i_frame_pos = p_sys->vid_mmap.frame;
1224     /* leave i_video_frame_size alone */
1225     return p_sys->p_video_mmap + p_sys->vid_mbuf.offsets[i_captured_frame];
1226 }
1227
1228 static uint8_t *GrabMJPEG( demux_t *p_demux )
1229 {
1230     demux_sys_t *p_sys = p_demux->p_sys;
1231     struct mjpeg_sync sync;
1232     uint8_t *p_frame, *p_field, *p;
1233     uint16_t tag;
1234     uint32_t i_size;
1235     struct quicktime_mjpeg_app1 *p_app1 = NULL;
1236
1237     /* re-queue the last frame we sync'd */
1238     if( p_sys->i_frame_pos != -1 )
1239     {
1240         while( ioctl( p_sys->i_fd, MJPIOC_QBUF_CAPT,
1241                                        &p_sys->i_frame_pos ) < 0 )
1242         {
1243             if( errno != EAGAIN && errno != EINTR )
1244             {
1245                 msg_Err( p_demux, "failed capturing new frame" );
1246                 return NULL;
1247             }
1248         }
1249     }
1250
1251     /* sync on the next frame */
1252     while( ioctl( p_sys->i_fd, MJPIOC_SYNC, &sync ) < 0 )
1253     {
1254         if( errno != EAGAIN && errno != EINTR )
1255         {
1256             msg_Err( p_demux, "failed syncing new frame" );
1257             return NULL;
1258         }
1259     }
1260
1261     p_sys->i_frame_pos = sync.frame;
1262     p_frame = p_sys->p_video_mmap + p_sys->mjpeg_buffers.size * sync.frame;
1263
1264     /* p_frame now points to the data.  fix up the Quicktime APP1 marker */
1265     tag = 0xffd9;
1266     tag = hton16( tag );
1267     p_field = p_frame;
1268
1269     /* look for EOI */
1270     p = memmem( p_field, sync.length, &tag, 2 );
1271
1272     if( p )
1273     {
1274         p += 2; /* data immediately following EOI */
1275         /* UNALIGNED! */
1276         p_app1 = (struct quicktime_mjpeg_app1 *)(p_field + 6);
1277
1278         i_size = ((uint32_t)(p - p_field));
1279         i_size = hton32( i_size );
1280         memcpy( &p_app1->i_field_size, &i_size, 4 );
1281
1282         while( *p == 0xff && *(p+1) == 0xff )
1283             p++;
1284
1285         i_size = ((uint32_t)(p - p_field));
1286         i_size = hton32( i_size );
1287         memcpy( &p_app1->i_padded_field_size, &i_size, 4 );
1288     }
1289
1290     tag = 0xffd8;
1291     tag = hton16( tag );
1292     p_field = memmem( p, sync.length - (size_t)(p - p_frame), &tag, 2 );
1293
1294     if( p_field )
1295     {
1296         i_size = (uint32_t)(p_field - p_frame);
1297         i_size = hton32( i_size );
1298         memcpy( &p_app1->i_next_field, &i_size, 4 );
1299
1300         /* UNALIGNED! */
1301         p_app1 = (struct quicktime_mjpeg_app1 *)(p_field + 6);
1302         tag = 0xffd9;
1303         tag = hton16( tag );
1304         p = memmem( p_field, sync.length - (size_t)(p_field - p_frame),
1305                 &tag, 2 );
1306
1307         if( !p )
1308         {
1309             /* sometimes the second field doesn't have the EOI.  just put it
1310              * there
1311              */
1312             p = p_frame + sync.length;
1313             memcpy( p, &tag, 2 );
1314             sync.length += 2;
1315         }
1316
1317         p += 2;
1318         i_size = (uint32_t)(p - p_field);
1319         i_size = hton32( i_size );
1320         memcpy( &p_app1->i_field_size, &i_size, 4 );
1321         i_size = (uint32_t)(sync.length - (uint32_t)(p_field - p_frame));
1322         i_size = hton32( i_size );
1323         memcpy( &p_app1->i_padded_field_size, &i_size, 4 );
1324     }
1325
1326     p_sys->i_video_frame_size = sync.length;
1327     return p_frame;
1328 }
1329
1330 static block_t *GrabVideo( demux_t *p_demux )
1331 {
1332     demux_sys_t *p_sys = p_demux->p_sys;
1333     uint8_t     *p_frame;
1334     block_t     *p_block;
1335
1336     if( p_sys->f_fps >= 0.1 && p_sys->i_video_pts > 0 )
1337     {
1338         mtime_t i_dur = (mtime_t)((double)1000000 / (double)p_sys->f_fps);
1339
1340         /* Did we wait long enough ? (frame rate reduction) */
1341         if( p_sys->i_video_pts + i_dur > mdate() ) return 0;
1342     }
1343
1344     if( p_sys->b_mjpeg ) p_frame = GrabMJPEG( p_demux );
1345     else p_frame = GrabCapture( p_demux );
1346
1347     if( !p_frame ) return 0;
1348
1349     if( !( p_block = block_New( p_demux, p_sys->i_video_frame_size ) ) )
1350     {
1351         msg_Warn( p_demux, "cannot get block" );
1352         return 0;
1353     }
1354
1355     memcpy( p_block->p_buffer, p_frame, p_sys->i_video_frame_size );
1356     p_sys->i_video_pts = p_block->i_pts = p_block->i_dts = mdate();
1357
1358     return p_block;
1359 }