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 #include <vlc_fs.h>
  42
  43 #include <sys/ioctl.h>
  44 #include <sys/mman.h>
  45 #include <fcntl.h>
  46 #include <arpa/inet.h>
  47 #include <errno.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 #ifdef HAVE_LIBV4L1
  68 #include <libv4l1.h>
  69 #endif
  70 /*****************************************************************************
  71  * Module descriptior
  72  *****************************************************************************/
  73 static int  Open ( vlc_object_t * );
  74 static void Close( vlc_object_t * );
  75
  76 #define CACHING_TEXT N_("Caching value in ms")
  77 #define CACHING_LONGTEXT N_( \
  78     "Caching value for V4L captures. This " \
  79     "value should be set in milliseconds." )
  80 #define VDEV_TEXT N_("Video device name")
  81 #define VDEV_LONGTEXT N_( \
  82     "Name of the video device to use. " \
  83     "If you don't specify anything, no video device will be used.")
  84 #define CHROMA_TEXT N_("Video input chroma format")
  85 #define CHROMA_LONGTEXT N_( \
  86     "Force the Video4Linux video device to use a specific chroma format " \
  87     "(eg. I420 (default), RV24, etc.)")
  88 #define FREQUENCY_TEXT N_( "Frequency" )
  89 #define FREQUENCY_LONGTEXT N_( \
  90     "Frequency to capture (in kHz), if applicable." )
  91 #define CHANNEL_TEXT N_( "Channel" )
  92 #define CHANNEL_LONGTEXT N_( \
  93     "Channel of the card to use (Usually, 0 = tuner, " \
  94     "1 = composite, 2 = svideo)." )
  95 #define NORM_TEXT N_( "Norm" )
  96 #define NORM_LONGTEXT N_( \
  97     "Norm of the stream (Automatic, SECAM, PAL, or NTSC)." )
  98 #define AUDIO_TEXT N_( "Audio Channel" )
  99 #define AUDIO_LONGTEXT N_( \
 100     "Audio Channel to use, if there are several audio inputs." )
 101 #define WIDTH_TEXT N_( "Width" )
 102 #define WIDTH_LONGTEXT N_( "Width of the stream to capture " \
 103     "(-1 for autodetect)." )
 104 #define HEIGHT_TEXT N_( "Height" )
 105 #define HEIGHT_LONGTEXT N_( "Height of the stream to capture " \
 106     "(-1 for autodetect)." )
 107 #define BRIGHTNESS_TEXT N_( "Brightness" )
 108 #define BRIGHTNESS_LONGTEXT N_( \
 109     "Brightness of the video input." )
 110 #define HUE_TEXT N_( "Hue" )
 111 #define HUE_LONGTEXT N_( \
 112     "Hue of the video input." )
 113 #define COLOUR_TEXT N_( "Color" )
 114 #define COLOUR_LONGTEXT N_( \
 115     "Color of the video input." )
 116 #define CONTRAST_TEXT N_( "Contrast" )
 117 #define CONTRAST_LONGTEXT N_( \
 118     "Contrast of the video input." )
 119 #define TUNER_TEXT N_( "Tuner" )
 120 #define TUNER_LONGTEXT N_( "Tuner to use, if there are several ones." )
 121 #define MJPEG_TEXT N_( "MJPEG" )
 122 #define MJPEG_LONGTEXT N_(  \
 123     "Set this option if the capture device outputs MJPEG" )
 124 #define DECIMATION_TEXT N_( "Decimation" )
 125 #define DECIMATION_LONGTEXT N_( \
 126     "Decimation level for MJPEG streams" )
 127 #define QUALITY_TEXT N_( "Quality" )
 128 #define QUALITY_LONGTEXT N_( "Quality of the stream." )
 129 #define FPS_TEXT N_( "Framerate" )
 130 #define FPS_LONGTEXT N_( "Framerate to capture, if applicable " \
 131     "(-1 for autodetect)." )
 132
 133 #define AUDIO_DEPRECATED_ERROR N_( \
 134     "Alsa or OSS audio capture in the v4l access is deprecated. " \
 135     "please use 'v4l:/""/ :input-slave=alsa:/""/' or " \
 136     "'v4l:/""/ :input-slave=oss:/""/' instead." )
 137
 138 static const int i_norm_list[] =
 139     { VIDEO_MODE_AUTO, VIDEO_MODE_SECAM, VIDEO_MODE_PAL, VIDEO_MODE_NTSC };
 140 static const char *const psz_norm_list_text[] =
 141     { N_("Automatic"), N_("SECAM"), N_("PAL"),  N_("NTSC") };
 142
 143 #define V4L_DEFAULT "/dev/video"
 144
 145 vlc_module_begin ()
 146     set_shortname( N_("Video4Linux") )
 147     set_description( N_("Video4Linux input") )
 148     set_category( CAT_INPUT )
 149     set_subcategory( SUBCAT_INPUT_ACCESS )
 150
 151     add_integer( "v4l-caching", DEFAULT_PTS_DELAY / 1000, NULL,
 152                  CACHING_TEXT, CACHING_LONGTEXT, true )
 153     add_obsolete_string( "v4l-vdev" );
 154     add_obsolete_string( "v4l-adev" );
 155     add_string( "v4l-chroma", NULL, NULL, CHROMA_TEXT, CHROMA_LONGTEXT,
 156                 true )
 157     add_float( "v4l-fps", -1.0, NULL, FPS_TEXT, FPS_LONGTEXT, true )
 158     add_obsolete_integer( "v4l-samplerate" );
 159     add_integer( "v4l-channel", 0, NULL, CHANNEL_TEXT, CHANNEL_LONGTEXT,
 160                 true )
 161     add_integer( "v4l-tuner", -1, NULL, TUNER_TEXT, TUNER_LONGTEXT, true )
 162     add_integer( "v4l-norm", VIDEO_MODE_AUTO, NULL, NORM_TEXT, NORM_LONGTEXT,
 163                 false )
 164         change_integer_list( i_norm_list, psz_norm_list_text, NULL );
 165     add_integer( "v4l-frequency", -1, NULL, FREQUENCY_TEXT, FREQUENCY_LONGTEXT,
 166                 false )
 167     add_integer( "v4l-audio", -1, NULL, AUDIO_TEXT, AUDIO_LONGTEXT, true )
 168     add_obsolete_bool( "v4l-stereo" );
 169     add_integer( "v4l-width", 0, NULL, WIDTH_TEXT, WIDTH_LONGTEXT, true )
 170     add_integer( "v4l-height", 0, NULL, HEIGHT_TEXT, HEIGHT_LONGTEXT,
 171                 true )
 172     add_integer( "v4l-brightness", -1, NULL, BRIGHTNESS_TEXT,
 173                 BRIGHTNESS_LONGTEXT, true )
 174     add_integer( "v4l-colour", -1, NULL, COLOUR_TEXT, COLOUR_LONGTEXT,
 175                 true )
 176     add_integer( "v4l-hue", -1, NULL, HUE_TEXT, HUE_LONGTEXT, true )
 177     add_integer( "v4l-contrast", -1, NULL, CONTRAST_TEXT, CONTRAST_LONGTEXT,
 178                 true )
 179     add_bool( "v4l-mjpeg", false, NULL, MJPEG_TEXT, MJPEG_LONGTEXT,
 180             true )
 181     add_integer( "v4l-decimation", 1, NULL, DECIMATION_TEXT,
 182             DECIMATION_LONGTEXT, true )
 183     add_integer( "v4l-quality", 100, NULL, QUALITY_TEXT, QUALITY_LONGTEXT,
 184             true )
 185
 186     add_shortcut( "v4l" )
 187     set_capability( "access_demux", 10 )
 188     set_callbacks( Open, Close )
 189 vlc_module_end ()
 190
 191 /*****************************************************************************
 192  * Access: local prototypes
 193  *****************************************************************************/
 194 static int Demux  ( demux_t * );
 195 static int Control( demux_t *, int, va_list );
 196
 197 static void ParseMRL    ( demux_t * );
 198 static int  OpenVideoDev( demux_t *, char * );
 199 static block_t *GrabVideo( demux_t * );
 200
 201 #define MJPEG_BUFFER_SIZE (256*1024)
 202
 203 struct quicktime_mjpeg_app1
 204 {
 205     uint32_t    i_reserved;             /* set to 0 */
 206     uint32_t    i_tag;                  /* 'mjpg' */
 207     uint32_t    i_field_size;           /* offset following EOI */
 208     uint32_t    i_padded_field_size;    /* offset following EOI+pad */
 209     uint32_t    i_next_field;           /* offset to next field */
 210     uint32_t    i_DQT_offset;
 211     uint32_t    i_DHT_offset;
 212     uint32_t    i_SOF_offset;
 213     uint32_t    i_SOS_offset;
 214     uint32_t    i_data_offset;          /* following SOS marker data */
 215 };
 216
 217 static const struct
 218 {
 219     int i_v4l;
 220     vlc_fourcc_t i_fourcc;
 221
 222 } v4lchroma_to_fourcc[] =
 223 {
 224     { VIDEO_PALETTE_GREY, VLC_CODEC_GREY },
 225     { VIDEO_PALETTE_HI240, VLC_FOURCC( 'I', '2', '4', '0' ) },
 226     { VIDEO_PALETTE_RGB565, VLC_CODEC_RGB16 },
 227     { VIDEO_PALETTE_RGB555, VLC_CODEC_RGB15 },
 228     { VIDEO_PALETTE_RGB24, VLC_CODEC_RGB24 },
 229     { VIDEO_PALETTE_RGB32, VLC_CODEC_RGB32 },
 230     { VIDEO_PALETTE_YUV422, VLC_CODEC_YUYV },
 231     { VIDEO_PALETTE_YUYV, VLC_CODEC_YUYV },
 232     { VIDEO_PALETTE_UYVY, VLC_CODEC_UYVY },
 233     { VIDEO_PALETTE_YUV420, VLC_FOURCC( 'I', '4', '2', 'N' ) },
 234     { VIDEO_PALETTE_YUV411, VLC_FOURCC( 'I', '4', '1', 'N' ) },
 235     { VIDEO_PALETTE_RAW, VLC_FOURCC( 'G', 'R', 'A', 'W' ) },
 236     { VIDEO_PALETTE_YUV422P, VLC_CODEC_I422 },
 237     { VIDEO_PALETTE_YUV420P, VLC_CODEC_I420 },
 238     { VIDEO_PALETTE_YUV411P, VLC_CODEC_I411 },
 239     { 0, 0 }
 240 };
 241
 242 struct demux_sys_t
 243 {
 244     /* Devices */
 245     char *psz_device;         /* Main device from MRL */
 246     int  i_fd;
 247
 248     /* Video properties */
 249     picture_t pic;
 250
 251     int i_fourcc;
 252     int i_channel;
 253     int i_audio;
 254     int i_norm;
 255     int i_tuner;
 256     int i_frequency;
 257     int i_width;
 258     int i_height;
 259
 260     int i_brightness;
 261     int i_hue;
 262     int i_colour;
 263     int i_contrast;
 264
 265     float f_fps;            /* <= 0.0 mean to grab at full rate */
 266     mtime_t i_video_pts;    /* only used when f_fps > 0 */
 267
 268     bool b_mjpeg;
 269     int i_decimation;
 270     int i_quality;
 271
 272     struct video_capability vid_cap;
 273     struct video_mbuf       vid_mbuf;
 274     struct mjpeg_requestbuffers mjpeg_buffers;
 275
 276     uint8_t *p_video_mmap;
 277     int     i_frame_pos;
 278
 279     struct video_mmap   vid_mmap;
 280     struct video_picture vid_picture;
 281
 282     int          i_video_frame_size;
 283     es_out_id_t  *p_es;
 284 };
 285
 286 #ifndef HAVE_LIBV4L1
 287 #   define v4l1_close close
 288 #   define v4l1_ioctl ioctl
 289 #   define v4l1_mmap mmap
 290 #   define v4l1_munmap munmap
 291 #   define v4l1_open vlc_open
 292 #endif
 293
 294 /*****************************************************************************
 295  * Open: opens v4l device
 296  *****************************************************************************
 297  *
 298  * url: <video device>::::
 299  *
 300  *****************************************************************************/
 301 static int Open( vlc_object_t *p_this )
 302 {
 303     demux_t     *p_demux = (demux_t*)p_this;
 304     demux_sys_t *p_sys;
 305
 306     /* Only when selected */
 307     if( *p_demux->psz_access == '\0' )
 308         return VLC_EGENERIC;
 309
 310     /* Set up p_demux */
 311     p_demux->pf_demux = Demux;
 312     p_demux->pf_control = Control;
 313     p_demux->info.i_update = 0;
 314     p_demux->info.i_title = 0;
 315     p_demux->info.i_seekpoint = 0;
 316     p_demux->p_sys = p_sys = calloc( 1, sizeof( demux_sys_t ) );
 317     if( !p_sys )
 318         return VLC_ENOMEM;
 319
 320     p_sys->i_audio      = var_CreateGetInteger( p_demux, "v4l-audio" );
 321     p_sys->i_channel    = var_CreateGetInteger( p_demux, "v4l-channel" );
 322     p_sys->i_norm       = var_CreateGetInteger( p_demux, "v4l-norm" );
 323     p_sys->i_tuner      = var_CreateGetInteger( p_demux, "v4l-tuner" );
 324     p_sys->i_frequency  = var_CreateGetInteger( p_demux, "v4l-frequency" );
 325
 326     p_sys->f_fps        = var_CreateGetFloat( p_demux, "v4l-fps" );
 327     p_sys->i_width      = var_CreateGetInteger( p_demux, "v4l-width" );
 328     p_sys->i_height     = var_CreateGetInteger( p_demux, "v4l-height" );
 329     p_sys->i_video_pts  = -1;
 330     p_sys->i_brightness = var_CreateGetInteger( p_demux, "v4l-brightness" );
 331
 332     p_sys->i_hue        = var_CreateGetInteger( p_demux, "v4l-hue" );
 333     p_sys->i_colour     = var_CreateGetInteger( p_demux, "v4l-colour" );
 334     p_sys->i_contrast   = var_CreateGetInteger( p_demux, "v4l-contrast" );
 335
 336     p_sys->b_mjpeg      = var_CreateGetBool( p_demux, "v4l-mjpeg" );
 337     p_sys->i_decimation = var_CreateGetInteger( p_demux, "v4l-decimation" );
 338     p_sys->i_quality    = var_CreateGetInteger( p_demux, "v4l-quality" );
 339
 340     p_sys->psz_device = NULL;
 341     p_sys->i_fd = -1;
 342
 343     p_sys->p_es = NULL;
 344
 345     ParseMRL( p_demux );
 346
 347     msg_Dbg( p_this, "opening device '%s'", p_sys->psz_device );
 348     p_sys->i_fd = OpenVideoDev( p_demux, p_sys->psz_device );
 349     if( p_sys->i_fd < 0 )
 350     {
 351         Close( p_this );
 352         return VLC_EGENERIC;
 353     }
 354
 355
 356     msg_Dbg( p_demux, "v4l grabbing started" );
 357
 358     /* Declare elementary streams */
 359     es_format_t fmt;
 360     es_format_Init( &fmt, VIDEO_ES, p_sys->i_fourcc );
 361     fmt.video.i_width  = p_sys->i_width;
 362     fmt.video.i_height = p_sys->i_height;
 363     fmt.video.i_sar_num = 4 * fmt.video.i_height;
 364     fmt.video.i_sar_den = 3 * fmt.video.i_width;
 365
 366     /* Setup rgb mask for RGB formats */
 367     switch( p_sys->i_fourcc )
 368     {
 369         case VLC_CODEC_RGB15:
 370             fmt.video.i_rmask = 0x001f;
 371             fmt.video.i_gmask = 0x03e0;
 372             fmt.video.i_bmask = 0x7c00;
 373             break;
 374         case VLC_CODEC_RGB16:
 375             fmt.video.i_rmask = 0x001f;
 376             fmt.video.i_gmask = 0x07e0;
 377             fmt.video.i_bmask = 0xf800;
 378             break;
 379         case VLC_CODEC_RGB24:
 380         case VLC_CODEC_RGB32:
 381             fmt.video.i_rmask = 0x00ff0000;
 382             fmt.video.i_gmask = 0x0000ff00;
 383             fmt.video.i_bmask = 0x000000ff;
 384             break;
 385     }
 386
 387     msg_Dbg( p_demux, "added new video es %4.4s %dx%d",
 388              (char*)&fmt.i_codec, fmt.video.i_width, fmt.video.i_height );
 389     p_sys->p_es = es_out_Add( p_demux->out, &fmt );
 390
 391     /* Update default_pts to a suitable value for access */
 392     var_Create( p_demux, "v4l-caching", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 393
 394     return VLC_SUCCESS;
 395 }
 396
 397 /*****************************************************************************
 398  * Close: close device, free resources
 399  *****************************************************************************/
 400 static void Close( vlc_object_t *p_this )
 401 {
 402     demux_t     *p_demux = (demux_t *)p_this;
 403     demux_sys_t *p_sys   = p_demux->p_sys;
 404
 405     free( p_sys->psz_device );
 406     if( p_sys->i_fd >= 0 ) v4l1_close( p_sys->i_fd );
 407
 408     if( p_sys->b_mjpeg )
 409     {
 410         int i_noframe = -1;
 411         v4l1_ioctl( p_sys->i_fd, MJPIOC_QBUF_CAPT, &i_noframe );
 412     }
 413
 414     if( p_sys->p_video_mmap && p_sys->p_video_mmap != MAP_FAILED )
 415     {
 416         if( p_sys->b_mjpeg )
 417             v4l1_munmap( p_sys->p_video_mmap, p_sys->mjpeg_buffers.size *
 418                     p_sys->mjpeg_buffers.count );
 419         else
 420             v4l1_munmap( p_sys->p_video_mmap, p_sys->vid_mbuf.size );
 421     }
 422
 423     free( p_sys );
 424 }
 425
 426 /*****************************************************************************
 427  * Control:
 428  *****************************************************************************/
 429 static int Control( demux_t *p_demux, int i_query, va_list args )
 430 {
 431     bool *pb;
 432     int64_t    *pi64;
 433
 434     switch( i_query )
 435     {
 436         /* Special for access_demux */
 437         case DEMUX_CAN_PAUSE:
 438         case DEMUX_CAN_SEEK:
 439         case DEMUX_CAN_CONTROL_PACE:
 440             pb = (bool*)va_arg( args, bool * );
 441             *pb = false;
 442             return VLC_SUCCESS;
 443
 444         case DEMUX_GET_PTS_DELAY:
 445             pi64 = (int64_t*)va_arg( args, int64_t * );
 446             *pi64 = (int64_t)var_GetInteger( p_demux, "v4l-caching" ) * 1000;
 447             return VLC_SUCCESS;
 448
 449         case DEMUX_GET_TIME:
 450             pi64 = (int64_t*)va_arg( args, int64_t * );
 451             *pi64 = mdate();
 452             return VLC_SUCCESS;
 453
 454         /* TODO implement others */
 455         default:
 456             return VLC_EGENERIC;
 457     }
 458
 459     return VLC_EGENERIC;
 460 }
 461
 462 /*****************************************************************************
 463  * Demux:
 464  *****************************************************************************/
 465 static int Demux( demux_t *p_demux )
 466 {
 467     demux_sys_t *p_sys = p_demux->p_sys;
 468
 469     block_t *p_block = GrabVideo( p_demux );
 470
 471     if( !p_block )
 472     {
 473         msleep( 10000 ); /* Unfortunately v4l doesn't allow polling */
 474         return 1;
 475     }
 476
 477     es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
 478     es_out_Send( p_demux->out, p_sys->p_es, p_block );
 479
 480     return 1;
 481 }
 482
 483 /*****************************************************************************
 484  * ParseMRL: parse the options contained in the MRL
 485  *****************************************************************************/
 486 static void ParseMRL( demux_t *p_demux )
 487 {
 488     demux_sys_t *p_sys = p_demux->p_sys;
 489
 490     char *psz_dup = strdup( p_demux->psz_path );
 491     char *psz_parser = psz_dup;
 492
 493     while( *psz_parser && *psz_parser != ':' )
 494     {
 495         psz_parser++;
 496     }
 497
 498     if( *psz_parser == ':' )
 499     {
 500         /* read options */
 501         for( ;; )
 502         {
 503             *psz_parser++ = '\0';
 504             if( !strncmp( psz_parser, "channel=", strlen( "channel=" ) ) )
 505             {
 506                 p_sys->i_channel = strtol( psz_parser + strlen( "channel=" ),
 507                                            &psz_parser, 0 );
 508             }
 509             else if( !strncmp( psz_parser, "norm=", strlen( "norm=" ) ) )
 510             {
 511                 psz_parser += strlen( "norm=" );
 512                 if( !strncmp( psz_parser, "pal", strlen( "pal" ) ) )
 513                 {
 514                     p_sys->i_norm = VIDEO_MODE_PAL;
 515                     psz_parser += strlen( "pal" );
 516                 }
 517                 else if( !strncmp( psz_parser, "ntsc", strlen( "ntsc" ) ) )
 518                 {
 519                     p_sys->i_norm = VIDEO_MODE_NTSC;
 520                     psz_parser += strlen( "ntsc" );
 521                 }
 522                 else if( !strncmp( psz_parser, "secam", strlen( "secam" ) ) )
 523                 {
 524                     p_sys->i_norm = VIDEO_MODE_SECAM;
 525                     psz_parser += strlen( "secam" );
 526                 }
 527                 else if( !strncmp( psz_parser, "auto", strlen( "auto" ) ) )
 528                 {
 529                     p_sys->i_norm = VIDEO_MODE_AUTO;
 530                     psz_parser += strlen( "auto" );
 531                 }
 532                 else
 533                 {
 534                     p_sys->i_norm = strtol( psz_parser, &psz_parser, 0 );
 535                 }
 536             }
 537             else if( !strncmp( psz_parser, "frequency=",
 538                                strlen( "frequency=" ) ) )
 539             {
 540                 p_sys->i_frequency =
 541                     strtol( psz_parser + strlen( "frequency=" ),
 542                             &psz_parser, 0 );
 543                 if( p_sys->i_frequency < 30000 )
 544                 {
 545                     msg_Warn( p_demux, "v4l syntax has changed : "
 546                               "'frequency' is now channel frequency in kHz");
 547                 }
 548             }
 549             else if( !strncmp( psz_parser, "audio=", strlen( "audio=" ) ) )
 550             {
 551                 p_sys->i_audio = strtol( psz_parser + strlen( "audio=" ),
 552                                          &psz_parser, 0 );
 553             }
 554             else if( !strncmp( psz_parser, "size=", strlen( "size=" ) ) )
 555             {
 556                 psz_parser += strlen( "size=" );
 557                 if( !strncmp( psz_parser, "subqcif", strlen( "subqcif" ) ) )
 558                 {
 559                     p_sys->i_width  = 128;
 560                     p_sys->i_height = 96;
 561                 }
 562                 else if( !strncmp( psz_parser, "qsif", strlen( "qsif" ) ) )
 563                 {
 564                     p_sys->i_width  = 160;
 565                     p_sys->i_height = 120;
 566                 }
 567                 else if( !strncmp( psz_parser, "qcif", strlen( "qcif" ) ) )
 568                 {
 569                     p_sys->i_width  = 176;
 570                     p_sys->i_height = 144;
 571                 }
 572                 else if( !strncmp( psz_parser, "sif", strlen( "sif" ) ) )
 573                 {
 574                     p_sys->i_width  = 320;
 575                     p_sys->i_height = 244;
 576                 }
 577                 else if( !strncmp( psz_parser, "cif", strlen( "cif" ) ) )
 578                 {
 579                     p_sys->i_width  = 352;
 580                     p_sys->i_height = 288;
 581                 }
 582                 else if( !strncmp( psz_parser, "vga", strlen( "vga" ) ) )
 583                 {
 584                     p_sys->i_width  = 640;
 585                     p_sys->i_height = 480;
 586                 }
 587                 else
 588                 {
 589                     /* widthxheight */
 590                     p_sys->i_width = strtol( psz_parser, &psz_parser, 0 );
 591                     if( *psz_parser == 'x' || *psz_parser == 'X')
 592                     {
 593                         p_sys->i_height = strtol( psz_parser + 1,
 594                                                   &psz_parser, 0 );
 595                     }
 596                     msg_Dbg( p_demux, "WxH %dx%d", p_sys->i_width,
 597                              p_sys->i_height );
 598                 }
 599             }
 600             else if( !strncmp( psz_parser, "brightness=", strlen( "brightness=" ) ) )
 601             {
 602                 p_sys->i_brightness = strtol( psz_parser + strlen( "brightness=" ),
 603                                               &psz_parser, 0 );
 604             }
 605             else if( !strncmp( psz_parser, "colour=", strlen( "colour=" ) ) )
 606             {
 607                 p_sys->i_colour = strtol( psz_parser + strlen( "colour=" ),
 608                                           &psz_parser, 0 );
 609             }
 610             else if( !strncmp( psz_parser, "hue=", strlen( "hue=" ) ) )
 611             {
 612                 p_sys->i_hue = strtol( psz_parser + strlen( "hue=" ),
 613                                        &psz_parser, 0 );
 614             }
 615             else if( !strncmp( psz_parser, "contrast=", strlen( "contrast=" ) ) )
 616             {
 617                 p_sys->i_contrast = strtol( psz_parser + strlen( "contrast=" ),
 618                                             &psz_parser, 0 );
 619             }
 620             else if( !strncmp( psz_parser, "tuner=", strlen( "tuner=" ) ) )
 621             {
 622                 p_sys->i_tuner = strtol( psz_parser + strlen( "tuner=" ),
 623                                          &psz_parser, 0 );
 624             }
 625             else if( !strncmp( psz_parser, "mjpeg", strlen( "mjpeg" ) ) )
 626             {
 627                 psz_parser += strlen( "mjpeg" );
 628
 629                 p_sys->b_mjpeg = true;
 630             }
 631             else if( !strncmp( psz_parser, "decimation=",
 632                         strlen( "decimation=" ) ) )
 633             {
 634                 p_sys->i_decimation =
 635                     strtol( psz_parser + strlen( "decimation=" ),
 636                             &psz_parser, 0 );
 637             }
 638             else if( !strncmp( psz_parser, "quality=",
 639                         strlen( "quality=" ) ) )
 640             {
 641                 p_sys->i_quality =
 642                     strtol( psz_parser + strlen( "quality=" ),
 643                             &psz_parser, 0 );
 644             }
 645             else if( !strncmp( psz_parser, "fps=", strlen( "fps=" ) ) )
 646             {
 647                 p_sys->f_fps = us_strtof( psz_parser + strlen( "fps=" ),
 648                                           &psz_parser );
 649             }
 650             else if( !strncmp( psz_parser, "adev=", strlen( "adev=" ) )
 651              || !strncmp( psz_parser, "samplerate=", strlen( "samplerate=" ) )
 652              || !strncmp( psz_parser, "stereo", strlen( "stereo" ) )
 653              || !strncmp( psz_parser, "mono", strlen( "mono" ) ) )
 654             {
 655                 if( strchr( psz_parser, ':' ) )
 656                     psz_parser = strchr( psz_parser, ':' );
 657                 else
 658                     psz_parser += strlen( psz_parser );
 659                 msg_Err( p_demux, AUDIO_DEPRECATED_ERROR );
 660             }
 661             else
 662             {
 663                 msg_Warn( p_demux, "unknown option" );
 664             }
 665
 666             while( *psz_parser && *psz_parser != ':' )
 667             {
 668                 psz_parser++;
 669             }
 670
 671             if( *psz_parser == '\0' )
 672             {
 673                 break;
 674             }
 675         }
 676     }
 677
 678     if( *psz_dup )
 679         p_sys->psz_device = strdup( psz_dup );
 680     else
 681         p_sys->psz_device = strdup( V4L_DEFAULT );
 682     free( psz_dup );
 683 }
 684
 685 /*****************************************************************************
 686  * OpenVideoDev:
 687  *****************************************************************************/
 688 static int OpenVideoDev( demux_t *p_demux, char *psz_device )
 689 {
 690     demux_sys_t *p_sys = p_demux->p_sys;
 691     int i_fd;
 692
 693     struct video_channel vid_channel;
 694     struct mjpeg_params mjpeg;
 695     int i;
 696
 697     if( ( i_fd = v4l1_open( psz_device, O_RDWR ) ) < 0 )
 698     {
 699         msg_Err( p_demux, "cannot open device (%m)" );
 700         goto vdev_failed;
 701     }
 702
 703     if( v4l1_ioctl( i_fd, VIDIOCGCAP, &p_sys->vid_cap ) < 0 )
 704     {
 705         msg_Err( p_demux, "cannot get capabilities (%m)" );
 706         goto vdev_failed;
 707     }
 708
 709     msg_Dbg( p_demux,
 710              "V4L device %s %d channels %d audios %d < w < %d %d < h < %d",
 711              p_sys->vid_cap.name,
 712              p_sys->vid_cap.channels,
 713              p_sys->vid_cap.audios,
 714              p_sys->vid_cap.minwidth,  p_sys->vid_cap.maxwidth,
 715              p_sys->vid_cap.minheight, p_sys->vid_cap.maxheight );
 716
 717     if( p_sys->i_channel < 0 || p_sys->i_channel >= p_sys->vid_cap.channels )
 718     {
 719         msg_Dbg( p_demux, "invalid channel, falling back on channel 0" );
 720         p_sys->i_channel = 0;
 721     }
 722     if( p_sys->vid_cap.audios && p_sys->i_audio >= p_sys->vid_cap.audios )
 723     {
 724         msg_Dbg( p_demux, "invalid audio, falling back with no audio" );
 725         p_sys->i_audio = -1;
 726     }
 727
 728     if( p_sys->i_width < p_sys->vid_cap.minwidth ||
 729         p_sys->i_width > p_sys->vid_cap.maxwidth )
 730     {
 731         msg_Dbg( p_demux, "invalid width %i", p_sys->i_width );
 732         p_sys->i_width = 0;
 733     }
 734     if( p_sys->i_height < p_sys->vid_cap.minheight ||
 735         p_sys->i_height > p_sys->vid_cap.maxheight )
 736     {
 737         msg_Dbg( p_demux, "invalid height %i", p_sys->i_height );
 738         p_sys->i_height = 0;
 739     }
 740
 741     if( !( p_sys->vid_cap.type & VID_TYPE_CAPTURE ) )
 742     {
 743         msg_Err( p_demux, "cannot grab" );
 744         goto vdev_failed;
 745     }
 746
 747     vid_channel.channel = p_sys->i_channel;
 748     if( v4l1_ioctl( i_fd, VIDIOCGCHAN, &vid_channel ) < 0 )
 749     {
 750         msg_Err( p_demux, "cannot get channel infos (%m)" );
 751         goto vdev_failed;
 752     }
 753     msg_Dbg( p_demux,
 754              "setting channel %s(%d) %d tuners flags=0x%x type=0x%x norm=0x%x",
 755              vid_channel.name, vid_channel.channel, vid_channel.tuners,
 756              vid_channel.flags, vid_channel.type, vid_channel.norm );
 757
 758     if( p_sys->i_tuner >= vid_channel.tuners )
 759     {
 760         msg_Dbg( p_demux, "invalid tuner, falling back on tuner 0" );
 761         p_sys->i_tuner = 0;
 762     }
 763
 764     vid_channel.norm = p_sys->i_norm;
 765     if( v4l1_ioctl( i_fd, VIDIOCSCHAN, &vid_channel ) < 0 )
 766     {
 767         msg_Err( p_demux, "cannot set channel (%m)" );
 768         goto vdev_failed;
 769     }
 770
 771     if( vid_channel.flags & VIDEO_VC_TUNER )
 772     {
 773
 774         /* set tuner */
 775 #if 0
 776         struct video_tuner vid_tuner;
 777         if( p_sys->i_tuner >= 0 )
 778         {
 779             vid_tuner.tuner = p_sys->i_tuner;
 780             if( v4l1_ioctl( i_fd, VIDIOCGTUNER, &vid_tuner ) < 0 )
 781             {
 782                 msg_Err( p_demux, "cannot get tuner (%m)" );
 783                 goto vdev_failed;
 784             }
 785             msg_Dbg( p_demux, "tuner %s low=%d high=%d, flags=0x%x "
 786                      "mode=0x%x signal=0x%x",
 787                      vid_tuner.name, vid_tuner.rangelow, vid_tuner.rangehigh,
 788                      vid_tuner.flags, vid_tuner.mode, vid_tuner.signal );
 789
 790             msg_Dbg( p_demux, "setting tuner %s (%d)",
 791                      vid_tuner.name, vid_tuner.tuner );
 792
 793             /* FIXME FIXME to be checked FIXME FIXME */
 794             //vid_tuner.mode = p_sys->i_norm;
 795             if( v4l1_ioctl( i_fd, VIDIOCSTUNER, &vid_tuner ) < 0 )
 796             {
 797                 msg_Err( p_demux, "cannot set tuner (%m)" );
 798                 goto vdev_failed;
 799             }
 800         }
 801 #endif
 802
 803         /* Show a warning if frequency is < than 30000.
 804          * User is certainly usint old syntax. */
 805
 806
 807         /* set frequency */
 808         if( p_sys->i_frequency >= 0 )
 809         {
 810             int driver_frequency = p_sys->i_frequency * 16 /1000;
 811             if( v4l1_ioctl( i_fd, VIDIOCSFREQ, &driver_frequency ) < 0 )
 812             {
 813                 msg_Err( p_demux, "cannot set frequency (%m)" );
 814                 goto vdev_failed;
 815             }
 816             msg_Dbg( p_demux, "frequency %d (%d)", p_sys->i_frequency,
 817                                                    driver_frequency );
 818         }
 819     }
 820
 821     /* set audio */
 822     if( vid_channel.flags & VIDEO_VC_AUDIO )
 823     {
 824         struct video_audio      vid_audio;
 825
 826         /* XXX TODO volume, balance, ... */
 827         if( p_sys->i_audio >= 0 )
 828         {
 829             vid_audio.audio = p_sys->i_audio;
 830             if( v4l1_ioctl( i_fd, VIDIOCGAUDIO, &vid_audio ) < 0 )
 831             {
 832                 msg_Err( p_demux, "cannot get audio (%m)" );
 833                 goto vdev_failed;
 834             }
 835
 836             /* unmute audio */
 837             vid_audio.flags &= ~VIDEO_AUDIO_MUTE;
 838
 839             if( v4l1_ioctl( i_fd, VIDIOCSAUDIO, &vid_audio ) < 0 )
 840             {
 841                 msg_Err( p_demux, "cannot set audio (%m)" );
 842                 goto vdev_failed;
 843             }
 844         }
 845
 846     }
 847
 848     /* establish basic params with input and norm before feeling width
 849      * or height */
 850     if( p_sys->b_mjpeg )
 851     {
 852         struct quicktime_mjpeg_app1 p_app1;
 853         int32_t i_offset;
 854
 855         if( v4l1_ioctl( i_fd, MJPIOC_G_PARAMS, &mjpeg ) < 0 )
 856         {
 857             msg_Err( p_demux, "cannot get mjpeg params (%m)" );
 858             goto vdev_failed;
 859         }
 860         mjpeg.input = p_sys->i_channel;
 861         mjpeg.norm  = p_sys->i_norm;
 862         mjpeg.decimation = p_sys->i_decimation;
 863
 864         if( p_sys->i_width )
 865             mjpeg.img_width = p_sys->i_width / p_sys->i_decimation;
 866         if( p_sys->i_height )
 867             mjpeg.img_height = p_sys->i_height / p_sys->i_decimation;
 868
 869         /* establish Quicktime APP1 marker while we are here */
 870         mjpeg.APPn = 1;
 871         mjpeg.APP_len = 40;
 872
 873         /* aligned */
 874         p_app1.i_reserved = 0;
 875         p_app1.i_tag = VLC_FOURCC( 'm','j','p','g' );
 876         p_app1.i_field_size = 0;
 877         p_app1.i_padded_field_size = 0;
 878         p_app1.i_next_field = 0;
 879         /* XXX WARNING XXX */
 880         /* these's nothing magic about these values.  We are dangerously
 881          * assuming the encoder card is encoding mjpeg-a and is not throwing
 882          * in marker tags we aren't expecting.  It's bad enough we have to
 883          * search through the jpeg output for every frame we grab just to
 884          * find the first field's end marker, so we take this risk to boost
 885          * performance.
 886          * This is really something the driver could do for us because this
 887          * does conform to standards outside of Apple Quicktime.
 888          */
 889         i_offset = 0x2e;
 890         p_app1.i_DQT_offset = hton32( i_offset );
 891         i_offset = 0xb4;
 892         p_app1.i_DHT_offset = hton32( i_offset );
 893         i_offset = 0x258;
 894         p_app1.i_SOF_offset = hton32( i_offset );
 895         i_offset = 0x26b;
 896         p_app1.i_SOS_offset = hton32( i_offset );
 897         i_offset = 0x279;
 898         p_app1.i_data_offset = hton32( i_offset );
 899         memcpy(mjpeg.APP_data, &p_app1, sizeof(struct quicktime_mjpeg_app1));
 900
 901         /* SOF and SOS aren't specified by the mjpeg API because they aren't
 902          * optional.  They will be present in the output. */
 903         mjpeg.jpeg_markers = JPEG_MARKER_DHT | JPEG_MARKER_DQT;
 904
 905         if( v4l1_ioctl( i_fd, MJPIOC_S_PARAMS, &mjpeg ) < 0 )
 906         {
 907             msg_Err( p_demux, "cannot set mjpeg params (%m)" );
 908             goto vdev_failed;
 909         }
 910
 911         p_sys->i_width = mjpeg.img_width * mjpeg.HorDcm;
 912         p_sys->i_height = mjpeg.img_height * mjpeg.VerDcm *
 913             mjpeg.field_per_buff;
 914     }
 915
 916     /* fix width/height */
 917     if( !p_sys->b_mjpeg && ( p_sys->i_width == 0 || p_sys->i_height == 0 ) )
 918     {
 919         struct video_window vid_win;
 920
 921         if( v4l1_ioctl( i_fd, VIDIOCGWIN, &vid_win ) < 0 )
 922         {
 923             msg_Err( p_demux, "cannot get win (%m)" );
 924             goto vdev_failed;
 925         }
 926         p_sys->i_width  = vid_win.width;
 927         p_sys->i_height = vid_win.height;
 928
 929         if( !p_sys->i_width || !p_sys->i_height )
 930         {
 931             p_sys->i_width = p_sys->vid_cap.maxwidth;
 932             p_sys->i_height = p_sys->vid_cap.maxheight;
 933         }
 934
 935         if( !p_sys->i_width || !p_sys->i_height )
 936         {
 937             msg_Err( p_demux, "invalid video size (%ix%i)",
 938                      p_sys->i_width, p_sys->i_height );
 939             goto vdev_failed;
 940         }
 941
 942         msg_Dbg( p_demux, "will use %dx%d", p_sys->i_width, p_sys->i_height );
 943     }
 944
 945     if( !p_sys->b_mjpeg )
 946     {
 947         /* set hue/color/.. */
 948         if( v4l1_ioctl( i_fd, VIDIOCGPICT, &p_sys->vid_picture ) == 0 )
 949         {
 950             struct video_picture vid_picture = p_sys->vid_picture;
 951
 952             if( p_sys->i_brightness >= 0 && p_sys->i_brightness < 65536 )
 953             {
 954                 vid_picture.brightness = p_sys->i_brightness;
 955             }
 956             if( p_sys->i_colour >= 0 && p_sys->i_colour < 65536 )
 957             {
 958                 vid_picture.colour = p_sys->i_colour;
 959             }
 960             if( p_sys->i_hue >= 0 && p_sys->i_hue < 65536 )
 961             {
 962                 vid_picture.hue = p_sys->i_hue;
 963             }
 964             if( p_sys->i_contrast  >= 0 && p_sys->i_contrast < 65536 )
 965             {
 966                 vid_picture.contrast = p_sys->i_contrast;
 967             }
 968             if( v4l1_ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
 969             {
 970                 msg_Dbg( p_demux, "v4l device uses brightness: %d",
 971                          vid_picture.brightness );
 972                 msg_Dbg( p_demux, "v4l device uses colour: %d",
 973                          vid_picture.colour );
 974                 msg_Dbg( p_demux, "v4l device uses hue: %d", vid_picture.hue );
 975                 msg_Dbg( p_demux, "v4l device uses contrast: %d",
 976                          vid_picture.contrast );
 977                 p_sys->vid_picture = vid_picture;
 978             }
 979         }
 980
 981         /* Find out video format used by device */
 982         if( v4l1_ioctl( i_fd, VIDIOCGPICT, &p_sys->vid_picture ) == 0 )
 983         {
 984             struct video_picture vid_picture = p_sys->vid_picture;
 985             char *psz;
 986             int i;
 987
 988             p_sys->i_fourcc = 0;
 989
 990             psz = var_CreateGetString( p_demux, "v4l-chroma" );
 991
 992             const vlc_fourcc_t i_chroma =
 993                 vlc_fourcc_GetCodecFromString( VIDEO_ES, psz );
 994             if( i_chroma )
 995             {
 996                 vid_picture.palette = 0;
 997
 998                 /* Find out v4l chroma code */
 999                 for( i = 0; v4lchroma_to_fourcc[i].i_v4l != 0; i++ )
1000                 {
1001                     if( v4lchroma_to_fourcc[i].i_fourcc == i_chroma )
1002                     {
1003                         vid_picture.palette = v4lchroma_to_fourcc[i].i_v4l;
1004                         break;
1005                     }
1006                 }
1007             }
1008             free( psz );
1009
1010             if( vid_picture.palette &&
1011                 !v4l1_ioctl( i_fd, VIDIOCSPICT, &vid_picture ) )
1012             {
1013                 p_sys->vid_picture = vid_picture;
1014             }
1015             else
1016             {
1017                 /* Try to set the format to something easy to encode */
1018                 vid_picture.palette = VIDEO_PALETTE_YUV420P;
1019                 if( v4l1_ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
1020                 {
1021                     p_sys->vid_picture = vid_picture;
1022                 }
1023                 else
1024                 {
1025                     vid_picture.palette = VIDEO_PALETTE_YUV422P;
1026                     if( v4l1_ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
1027                     {
1028                         p_sys->vid_picture = vid_picture;
1029                     }
1030                 }
1031             }
1032
1033             /* Find out final format */
1034             for( i = 0; v4lchroma_to_fourcc[i].i_v4l != 0; i++ )
1035             {
1036                 if( v4lchroma_to_fourcc[i].i_v4l == p_sys->vid_picture.palette)
1037                 {
1038                     p_sys->i_fourcc = v4lchroma_to_fourcc[i].i_fourcc;
1039                     break;
1040                 }
1041             }
1042         }
1043         else
1044         {
1045             msg_Err( p_demux, "ioctl VIDIOCGPICT failed" );
1046             goto vdev_failed;
1047         }
1048     }
1049
1050     if( p_sys->b_mjpeg )
1051     {
1052         int i;
1053
1054         p_sys->mjpeg_buffers.count = 8;
1055         p_sys->mjpeg_buffers.size = MJPEG_BUFFER_SIZE;
1056
1057         if( v4l1_ioctl( i_fd, MJPIOC_REQBUFS, &p_sys->mjpeg_buffers ) < 0 )
1058         {
1059             msg_Err( p_demux, "mmap unsupported" );
1060             goto vdev_failed;
1061         }
1062
1063         p_sys->p_video_mmap = v4l1_mmap( 0,
1064                 p_sys->mjpeg_buffers.size * p_sys->mjpeg_buffers.count,
1065                 PROT_READ | PROT_WRITE, MAP_SHARED, i_fd, 0 );
1066         if( p_sys->p_video_mmap == MAP_FAILED )
1067         {
1068             msg_Err( p_demux, "mmap failed" );
1069             goto vdev_failed;
1070         }
1071
1072         p_sys->i_fourcc  = VLC_CODEC_MJPG;
1073         p_sys->i_frame_pos = -1;
1074
1075         /* queue up all the frames */
1076         for( i = 0; i < (int)p_sys->mjpeg_buffers.count; i++ )
1077         {
1078             if( v4l1_ioctl( i_fd, MJPIOC_QBUF_CAPT, &i ) < 0 )
1079             {
1080                 msg_Err( p_demux, "unable to queue frame" );
1081                 goto vdev_failed;
1082             }
1083         }
1084     }
1085     else
1086     {
1087         /* Fill in picture_t fields */
1088         if( picture_Setup( &p_sys->pic, p_sys->i_fourcc,
1089                            p_sys->i_width, p_sys->i_height,
1090                            1, 1 ) )
1091         {
1092             msg_Err( p_demux, "unsupported chroma" );
1093             goto vdev_failed;
1094         }
1095         p_sys->i_video_frame_size = 0;
1096         for( i = 0; i < p_sys->pic.i_planes; i++ )
1097         {
1098             p_sys->i_video_frame_size += p_sys->pic.p[i].i_visible_lines *
1099               p_sys->pic.p[i].i_visible_pitch;
1100         }
1101
1102         msg_Dbg( p_demux, "v4l device uses frame size: %i",
1103                  p_sys->i_video_frame_size );
1104         msg_Dbg( p_demux, "v4l device uses chroma: %4.4s",
1105                 (char*)&p_sys->i_fourcc );
1106
1107         /* Allocate mmap buffer */
1108         if( v4l1_ioctl( i_fd, VIDIOCGMBUF, &p_sys->vid_mbuf ) < 0 )
1109         {
1110             msg_Err( p_demux, "mmap unsupported" );
1111             goto vdev_failed;
1112         }
1113
1114         p_sys->p_video_mmap = v4l1_mmap( 0, p_sys->vid_mbuf.size,
1115                                     PROT_READ|PROT_WRITE, MAP_SHARED,
1116                                     i_fd, 0 );
1117         if( p_sys->p_video_mmap == MAP_FAILED )
1118         {
1119             /* FIXME -> normal read */
1120             msg_Err( p_demux, "mmap failed" );
1121             goto vdev_failed;
1122         }
1123
1124         /* init grabbing */
1125         p_sys->vid_mmap.frame  = 0;
1126         p_sys->vid_mmap.width  = p_sys->i_width;
1127         p_sys->vid_mmap.height = p_sys->i_height;
1128         p_sys->vid_mmap.format = p_sys->vid_picture.palette;
1129         if( v4l1_ioctl( i_fd, VIDIOCMCAPTURE, &p_sys->vid_mmap ) < 0 )
1130         {
1131             msg_Warn( p_demux, "%4.4s refused", (char*)&p_sys->i_fourcc );
1132             msg_Err( p_demux, "chroma selection failed" );
1133             goto vdev_failed;
1134         }
1135     }
1136     return i_fd;
1137
1138 vdev_failed:
1139
1140     if( i_fd >= 0 ) v4l1_close( i_fd );
1141     return -1;
1142 }
1143
1144 /*****************************************************************************
1145  * GrabVideo:
1146  *****************************************************************************/
1147 static uint8_t *GrabCapture( demux_t *p_demux )
1148 {
1149     demux_sys_t *p_sys = p_demux->p_sys;
1150     int i_captured_frame = p_sys->i_frame_pos;
1151
1152     p_sys->vid_mmap.frame = (p_sys->i_frame_pos + 1) % p_sys->vid_mbuf.frames;
1153
1154     while( v4l1_ioctl( p_sys->i_fd, VIDIOCMCAPTURE, &p_sys->vid_mmap ) < 0 )
1155     {
1156         if( errno != EAGAIN )
1157         {
1158             msg_Err( p_demux, "failed capturing new frame" );
1159             return NULL;
1160         }
1161
1162         if( !vlc_object_alive (p_demux) )
1163         {
1164             return NULL;
1165         }
1166
1167         msg_Dbg( p_demux, "grab failed, trying again" );
1168     }
1169
1170     while( v4l1_ioctl(p_sys->i_fd, VIDIOCSYNC, &p_sys->i_frame_pos) < 0 )
1171     {
1172         if( errno != EAGAIN && errno != EINTR )
1173         {
1174             msg_Err( p_demux, "failed syncing new frame" );
1175             return NULL;
1176         }
1177     }
1178
1179     p_sys->i_frame_pos = p_sys->vid_mmap.frame;
1180     /* leave i_video_frame_size alone */
1181     return p_sys->p_video_mmap + p_sys->vid_mbuf.offsets[i_captured_frame];
1182 }
1183
1184 static uint8_t *GrabMJPEG( demux_t *p_demux )
1185 {
1186     demux_sys_t *p_sys = p_demux->p_sys;
1187     struct mjpeg_sync sync;
1188     uint8_t *p_frame, *p_field, *p;
1189     uint16_t tag;
1190     uint32_t i_size;
1191     struct quicktime_mjpeg_app1 *p_app1 = NULL;
1192
1193     /* re-queue the last frame we sync'd */
1194     if( p_sys->i_frame_pos != -1 )
1195     {
1196         while( v4l1_ioctl( p_sys->i_fd, MJPIOC_QBUF_CAPT,
1197                                        &p_sys->i_frame_pos ) < 0 )
1198         {
1199             if( errno != EAGAIN && errno != EINTR )
1200             {
1201                 msg_Err( p_demux, "failed capturing new frame" );
1202                 return NULL;
1203             }
1204         }
1205     }
1206
1207     /* sync on the next frame */
1208     while( v4l1_ioctl( p_sys->i_fd, MJPIOC_SYNC, &sync ) < 0 )
1209     {
1210         if( errno != EAGAIN && errno != EINTR )
1211         {
1212             msg_Err( p_demux, "failed syncing new frame" );
1213             return NULL;
1214         }
1215     }
1216
1217     p_sys->i_frame_pos = sync.frame;
1218     p_frame = p_sys->p_video_mmap + p_sys->mjpeg_buffers.size * sync.frame;
1219
1220     /* p_frame now points to the data.  fix up the Quicktime APP1 marker */
1221     tag = 0xffd9;
1222     tag = hton16( tag );
1223     p_field = p_frame;
1224
1225     /* look for EOI */
1226     p = memmem( p_field, sync.length, &tag, 2 );
1227
1228     if( p )
1229     {
1230         p += 2; /* data immediately following EOI */
1231         /* UNALIGNED! */
1232         p_app1 = (struct quicktime_mjpeg_app1 *)(p_field + 6);
1233
1234         i_size = ((uint32_t)(p - p_field));
1235         i_size = hton32( i_size );
1236         memcpy( &p_app1->i_field_size, &i_size, 4 );
1237
1238         while( *p == 0xff && *(p+1) == 0xff )
1239             p++;
1240
1241         i_size = ((uint32_t)(p - p_field));
1242         i_size = hton32( i_size );
1243         memcpy( &p_app1->i_padded_field_size, &i_size, 4 );
1244     }
1245
1246     tag = 0xffd8;
1247     tag = hton16( tag );
1248     p_field = memmem( p, sync.length - (size_t)(p - p_frame), &tag, 2 );
1249
1250     if( p_field )
1251     {
1252         i_size = (uint32_t)(p_field - p_frame);
1253         i_size = hton32( i_size );
1254         memcpy( &p_app1->i_next_field, &i_size, 4 );
1255
1256         /* UNALIGNED! */
1257         p_app1 = (struct quicktime_mjpeg_app1 *)(p_field + 6);
1258         tag = 0xffd9;
1259         tag = hton16( tag );
1260         p = memmem( p_field, sync.length - (size_t)(p_field - p_frame),
1261                 &tag, 2 );
1262
1263         if( !p )
1264         {
1265             /* sometimes the second field doesn't have the EOI.  just put it
1266              * there
1267              */
1268             p = p_frame + sync.length;
1269             memcpy( p, &tag, 2 );
1270             sync.length += 2;
1271         }
1272
1273         p += 2;
1274         i_size = (uint32_t)(p - p_field);
1275         i_size = hton32( i_size );
1276         memcpy( &p_app1->i_field_size, &i_size, 4 );
1277         i_size = (uint32_t)(sync.length - (uint32_t)(p_field - p_frame));
1278         i_size = hton32( i_size );
1279         memcpy( &p_app1->i_padded_field_size, &i_size, 4 );
1280     }
1281
1282     p_sys->i_video_frame_size = sync.length;
1283     return p_frame;
1284 }
1285
1286 static block_t *GrabVideo( demux_t *p_demux )
1287 {
1288     demux_sys_t *p_sys = p_demux->p_sys;
1289     uint8_t     *p_frame;
1290     block_t     *p_block;
1291
1292     if( p_sys->f_fps >= 0.1 && p_sys->i_video_pts > 0 )
1293     {
1294         mtime_t i_dur = (mtime_t)((double)1000000 / (double)p_sys->f_fps);
1295
1296         /* Did we wait long enough ? (frame rate reduction) */
1297         if( p_sys->i_video_pts + i_dur > mdate() ) return 0;
1298     }
1299
1300     if( p_sys->b_mjpeg ) p_frame = GrabMJPEG( p_demux );
1301     else p_frame = GrabCapture( p_demux );
1302
1303     if( !p_frame ) return 0;
1304
1305     if( !( p_block = block_New( p_demux, p_sys->i_video_frame_size ) ) )
1306     {
1307         msg_Warn( p_demux, "cannot get block" );
1308         return 0;
1309     }
1310
1311     memcpy( p_block->p_buffer, p_frame, p_sys->i_video_frame_size );
1312     p_sys->i_video_pts = p_block->i_pts = p_block->i_dts = mdate();
1313
1314     return p_block;
1315 }