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_charset.h>
  42 #include <vlc_fs.h>
  43
  44 #include <sys/ioctl.h>
  45 #include <sys/mman.h>
  46 #include <fcntl.h>
  47 #include <arpa/inet.h>
  48 #include <errno.h>
  49
  50 /* From GStreamer's v4l plugin:
  51  * Because of some really cool feature in video4linux1, also known as
  52  * 'not including sys/types.h and sys/time.h', we had to include it
  53  * ourselves. In all their intelligence, these people decided to fix
  54  * this in the next version (video4linux2) in such a cool way that it
  55  * breaks all compilations of old stuff...
  56  * The real problem is actually that linux/time.h doesn't use proper
  57  * macro checks before defining types like struct timeval. The proper
  58  * fix here is to either fuck the kernel header (which is what we do
  59  * by defining _LINUX_TIME_H, an innocent little hack) or by fixing it
  60  * upstream, which I'll consider doing later on. If you get compiler
  61  * errors here, check your linux/time.h && sys/time.h header setup.
  62 */
  63 #define _LINUX_TIME_H
  64
  65 #include <linux/videodev.h>
  66 #include "videodev_mjpeg.h"
  67
  68 #ifdef HAVE_LIBV4L1
  69 #include <libv4l1.h>
  70 #endif
  71 /*****************************************************************************
  72  * Module descriptior
  73  *****************************************************************************/
  74 static int  Open ( vlc_object_t * );
  75 static void Close( vlc_object_t * );
  76
  77 #define CACHING_TEXT N_("Caching value in ms")
  78 #define CACHING_LONGTEXT N_( \
  79     "Caching value for V4L captures. This " \
  80     "value should be set in milliseconds." )
  81 #define VDEV_TEXT N_("Video device name")
  82 #define VDEV_LONGTEXT N_( \
  83     "Name of the video device to use. " \
  84     "If you don't specify anything, no video device will be used.")
  85 #define CHROMA_TEXT N_("Video input chroma format")
  86 #define CHROMA_LONGTEXT N_( \
  87     "Force the Video4Linux video device to use a specific chroma format " \
  88     "(eg. I420 (default), RV24, etc.)")
  89 #define FREQUENCY_TEXT N_( "Frequency" )
  90 #define FREQUENCY_LONGTEXT N_( \
  91     "Frequency to capture (in kHz), if applicable." )
  92 #define CHANNEL_TEXT N_( "Channel" )
  93 #define CHANNEL_LONGTEXT N_( \
  94     "Channel of the card to use (Usually, 0 = tuner, " \
  95     "1 = composite, 2 = svideo)." )
  96 #define NORM_TEXT N_( "Norm" )
  97 #define NORM_LONGTEXT N_( \
  98     "Norm of the stream (Automatic, SECAM, PAL, or NTSC)." )
  99 #define AUDIO_TEXT N_( "Audio Channel" )
 100 #define AUDIO_LONGTEXT N_( \
 101     "Audio Channel to use, if there are several audio inputs." )
 102 #define WIDTH_TEXT N_( "Width" )
 103 #define WIDTH_LONGTEXT N_( "Width of the stream to capture " \
 104     "(-1 for autodetect)." )
 105 #define HEIGHT_TEXT N_( "Height" )
 106 #define HEIGHT_LONGTEXT N_( "Height of the stream to capture " \
 107     "(-1 for autodetect)." )
 108 #define BRIGHTNESS_TEXT N_( "Brightness" )
 109 #define BRIGHTNESS_LONGTEXT N_( \
 110     "Brightness of the video input." )
 111 #define HUE_TEXT N_( "Hue" )
 112 #define HUE_LONGTEXT N_( \
 113     "Hue of the video input." )
 114 #define COLOUR_TEXT N_( "Color" )
 115 #define COLOUR_LONGTEXT N_( \
 116     "Color of the video input." )
 117 #define CONTRAST_TEXT N_( "Contrast" )
 118 #define CONTRAST_LONGTEXT N_( \
 119     "Contrast of the video input." )
 120 #define TUNER_TEXT N_( "Tuner" )
 121 #define TUNER_LONGTEXT N_( "Tuner to use, if there are several ones." )
 122 #define MJPEG_TEXT N_( "MJPEG" )
 123 #define MJPEG_LONGTEXT N_(  \
 124     "Set this option if the capture device outputs MJPEG" )
 125 #define DECIMATION_TEXT N_( "Decimation" )
 126 #define DECIMATION_LONGTEXT N_( \
 127     "Decimation level for MJPEG streams" )
 128 #define QUALITY_TEXT N_( "Quality" )
 129 #define QUALITY_LONGTEXT N_( "Quality of the stream." )
 130 #define FPS_TEXT N_( "Framerate" )
 131 #define FPS_LONGTEXT N_( "Framerate to capture, if applicable " \
 132     "(-1 for autodetect)." )
 133
 134 #define AUDIO_DEPRECATED_ERROR N_( \
 135     "Alsa or OSS audio capture in the v4l access is deprecated. " \
 136     "please use 'v4l:/""/ :input-slave=alsa:/""/' or " \
 137     "'v4l:/""/ :input-slave=oss:/""/' instead." )
 138
 139 static const int i_norm_list[] =
 140     { VIDEO_MODE_AUTO, VIDEO_MODE_SECAM, VIDEO_MODE_PAL, VIDEO_MODE_NTSC };
 141 static const char *const psz_norm_list_text[] =
 142     { N_("Automatic"), N_("SECAM"), N_("PAL"),  N_("NTSC") };
 143
 144 #define V4L_DEFAULT "/dev/video"
 145
 146 vlc_module_begin ()
 147     set_shortname( N_("Video4Linux") )
 148     set_description( N_("Video4Linux input") )
 149     set_category( CAT_INPUT )
 150     set_subcategory( SUBCAT_INPUT_ACCESS )
 151
 152     add_integer( "v4l-caching", DEFAULT_PTS_DELAY / 1000, NULL,
 153                  CACHING_TEXT, CACHING_LONGTEXT, true )
 154     add_obsolete_string( "v4l-vdev" );
 155     add_obsolete_string( "v4l-adev" );
 156     add_string( "v4l-chroma", NULL, NULL, CHROMA_TEXT, CHROMA_LONGTEXT,
 157                 true )
 158     add_float( "v4l-fps", -1.0, NULL, FPS_TEXT, FPS_LONGTEXT, true )
 159     add_obsolete_integer( "v4l-samplerate" );
 160     add_integer( "v4l-channel", 0, NULL, CHANNEL_TEXT, CHANNEL_LONGTEXT,
 161                 true )
 162     add_integer( "v4l-tuner", -1, NULL, TUNER_TEXT, TUNER_LONGTEXT, true )
 163     add_integer( "v4l-norm", VIDEO_MODE_AUTO, NULL, NORM_TEXT, NORM_LONGTEXT,
 164                 false )
 165         change_integer_list( i_norm_list, psz_norm_list_text, NULL );
 166     add_integer( "v4l-frequency", -1, NULL, FREQUENCY_TEXT, FREQUENCY_LONGTEXT,
 167                 false )
 168     add_integer( "v4l-audio", -1, NULL, AUDIO_TEXT, AUDIO_LONGTEXT, true )
 169     add_obsolete_bool( "v4l-stereo" );
 170     add_integer( "v4l-width", 0, NULL, WIDTH_TEXT, WIDTH_LONGTEXT, true )
 171     add_integer( "v4l-height", 0, NULL, HEIGHT_TEXT, HEIGHT_LONGTEXT,
 172                 true )
 173     add_integer( "v4l-brightness", -1, NULL, BRIGHTNESS_TEXT,
 174                 BRIGHTNESS_LONGTEXT, true )
 175     add_integer( "v4l-colour", -1, NULL, COLOUR_TEXT, COLOUR_LONGTEXT,
 176                 true )
 177     add_integer( "v4l-hue", -1, NULL, HUE_TEXT, HUE_LONGTEXT, true )
 178     add_integer( "v4l-contrast", -1, NULL, CONTRAST_TEXT, CONTRAST_LONGTEXT,
 179                 true )
 180     add_bool( "v4l-mjpeg", false, NULL, MJPEG_TEXT, MJPEG_LONGTEXT,
 181             true )
 182     add_integer( "v4l-decimation", 1, NULL, DECIMATION_TEXT,
 183             DECIMATION_LONGTEXT, true )
 184     add_integer( "v4l-quality", 100, NULL, QUALITY_TEXT, QUALITY_LONGTEXT,
 185             true )
 186
 187     add_shortcut( "v4l" )
 188     set_capability( "access_demux", 10 )
 189     set_callbacks( Open, Close )
 190 vlc_module_end ()
 191
 192 /*****************************************************************************
 193  * Access: local prototypes
 194  *****************************************************************************/
 195 static int Demux  ( demux_t * );
 196 static int Control( demux_t *, int, va_list );
 197
 198 static void ParseMRL    ( demux_t * );
 199 static int  OpenVideoDev( demux_t *, char * );
 200 static block_t *GrabVideo( demux_t * );
 201
 202 #define MJPEG_BUFFER_SIZE (256*1024)
 203
 204 struct quicktime_mjpeg_app1
 205 {
 206     uint32_t    i_reserved;             /* set to 0 */
 207     uint32_t    i_tag;                  /* 'mjpg' */
 208     uint32_t    i_field_size;           /* offset following EOI */
 209     uint32_t    i_padded_field_size;    /* offset following EOI+pad */
 210     uint32_t    i_next_field;           /* offset to next field */
 211     uint32_t    i_DQT_offset;
 212     uint32_t    i_DHT_offset;
 213     uint32_t    i_SOF_offset;
 214     uint32_t    i_SOS_offset;
 215     uint32_t    i_data_offset;          /* following SOS marker data */
 216 };
 217
 218 static const struct
 219 {
 220     int i_v4l;
 221     vlc_fourcc_t i_fourcc;
 222
 223 } v4lchroma_to_fourcc[] =
 224 {
 225     { VIDEO_PALETTE_GREY, VLC_CODEC_GREY },
 226     { VIDEO_PALETTE_HI240, VLC_FOURCC( 'I', '2', '4', '0' ) },
 227     { VIDEO_PALETTE_RGB565, VLC_CODEC_RGB16 },
 228     { VIDEO_PALETTE_RGB555, VLC_CODEC_RGB15 },
 229     { VIDEO_PALETTE_RGB24, VLC_CODEC_RGB24 },
 230     { VIDEO_PALETTE_RGB32, VLC_CODEC_RGB32 },
 231     { VIDEO_PALETTE_YUV422, VLC_CODEC_YUYV },
 232     { VIDEO_PALETTE_YUYV, VLC_CODEC_YUYV },
 233     { VIDEO_PALETTE_UYVY, VLC_CODEC_UYVY },
 234     { VIDEO_PALETTE_YUV420, VLC_FOURCC( 'I', '4', '2', 'N' ) },
 235     { VIDEO_PALETTE_YUV411, VLC_FOURCC( 'I', '4', '1', 'N' ) },
 236     { VIDEO_PALETTE_RAW, VLC_FOURCC( 'G', 'R', 'A', 'W' ) },
 237     { VIDEO_PALETTE_YUV422P, VLC_CODEC_I422 },
 238     { VIDEO_PALETTE_YUV420P, VLC_CODEC_I420 },
 239     { VIDEO_PALETTE_YUV411P, VLC_CODEC_I411 },
 240     { 0, 0 }
 241 };
 242
 243 struct demux_sys_t
 244 {
 245     /* Devices */
 246     char *psz_device;         /* Main device from MRL */
 247     int  i_fd;
 248
 249     /* Video properties */
 250     picture_t pic;
 251
 252     int i_fourcc;
 253     int i_channel;
 254     int i_audio;
 255     int i_norm;
 256     int i_tuner;
 257     int i_frequency;
 258     int i_width;
 259     int i_height;
 260
 261     int i_brightness;
 262     int i_hue;
 263     int i_colour;
 264     int i_contrast;
 265
 266     float f_fps;            /* <= 0.0 mean to grab at full rate */
 267     mtime_t i_video_pts;    /* only used when f_fps > 0 */
 268
 269     bool b_mjpeg;
 270     int i_decimation;
 271     int i_quality;
 272
 273     struct video_capability vid_cap;
 274     struct video_mbuf       vid_mbuf;
 275     struct mjpeg_requestbuffers mjpeg_buffers;
 276
 277     uint8_t *p_video_mmap;
 278     int     i_frame_pos;
 279
 280     struct video_mmap   vid_mmap;
 281     struct video_picture vid_picture;
 282
 283     int          i_video_frame_size;
 284     es_out_id_t  *p_es;
 285 };
 286
 287 #ifndef HAVE_LIBV4L1
 288 #   define v4l1_close close
 289 #   define v4l1_ioctl ioctl
 290 #   define v4l1_mmap mmap
 291 #   define v4l1_munmap munmap
 292 #   define v4l1_open vlc_open
 293 #endif
 294
 295 /*****************************************************************************
 296  * Open: opens v4l device
 297  *****************************************************************************
 298  *
 299  * url: <video device>::::
 300  *
 301  *****************************************************************************/
 302 static int Open( vlc_object_t *p_this )
 303 {
 304     demux_t     *p_demux = (demux_t*)p_this;
 305     demux_sys_t *p_sys;
 306
 307     /* Only when selected */
 308     if( *p_demux->psz_access == '\0' )
 309         return VLC_EGENERIC;
 310
 311     /* Set up p_demux */
 312     p_demux->pf_demux = Demux;
 313     p_demux->pf_control = Control;
 314     p_demux->info.i_update = 0;
 315     p_demux->info.i_title = 0;
 316     p_demux->info.i_seekpoint = 0;
 317     p_demux->p_sys = p_sys = calloc( 1, sizeof( demux_sys_t ) );
 318     if( !p_sys )
 319         return VLC_ENOMEM;
 320
 321     p_sys->i_audio      = var_CreateGetInteger( p_demux, "v4l-audio" );
 322     p_sys->i_channel    = var_CreateGetInteger( p_demux, "v4l-channel" );
 323     p_sys->i_norm       = var_CreateGetInteger( p_demux, "v4l-norm" );
 324     p_sys->i_tuner      = var_CreateGetInteger( p_demux, "v4l-tuner" );
 325     p_sys->i_frequency  = var_CreateGetInteger( p_demux, "v4l-frequency" );
 326
 327     p_sys->f_fps        = var_CreateGetFloat( p_demux, "v4l-fps" );
 328     p_sys->i_width      = var_CreateGetInteger( p_demux, "v4l-width" );
 329     p_sys->i_height     = var_CreateGetInteger( p_demux, "v4l-height" );
 330     p_sys->i_video_pts  = -1;
 331     p_sys->i_brightness = var_CreateGetInteger( p_demux, "v4l-brightness" );
 332
 333     p_sys->i_hue        = var_CreateGetInteger( p_demux, "v4l-hue" );
 334     p_sys->i_colour     = var_CreateGetInteger( p_demux, "v4l-colour" );
 335     p_sys->i_contrast   = var_CreateGetInteger( p_demux, "v4l-contrast" );
 336
 337     p_sys->b_mjpeg      = var_CreateGetBool( p_demux, "v4l-mjpeg" );
 338     p_sys->i_decimation = var_CreateGetInteger( p_demux, "v4l-decimation" );
 339     p_sys->i_quality    = var_CreateGetInteger( p_demux, "v4l-quality" );
 340
 341     p_sys->psz_device = NULL;
 342     p_sys->i_fd = -1;
 343
 344     p_sys->p_es = NULL;
 345
 346     ParseMRL( p_demux );
 347
 348     msg_Dbg( p_this, "opening device '%s'", p_sys->psz_device );
 349     p_sys->i_fd = OpenVideoDev( p_demux, p_sys->psz_device );
 350     if( p_sys->i_fd < 0 )
 351     {
 352         Close( p_this );
 353         return VLC_EGENERIC;
 354     }
 355
 356
 357     msg_Dbg( p_demux, "v4l grabbing started" );
 358
 359     /* Declare elementary streams */
 360     es_format_t fmt;
 361     es_format_Init( &fmt, VIDEO_ES, p_sys->i_fourcc );
 362     fmt.video.i_width  = p_sys->i_width;
 363     fmt.video.i_height = p_sys->i_height;
 364     fmt.video.i_sar_num = 4 * fmt.video.i_height;
 365     fmt.video.i_sar_den = 3 * fmt.video.i_width;
 366
 367     /* Setup rgb mask for RGB formats */
 368     switch( p_sys->i_fourcc )
 369     {
 370         case VLC_CODEC_RGB15:
 371             fmt.video.i_rmask = 0x001f;
 372             fmt.video.i_gmask = 0x03e0;
 373             fmt.video.i_bmask = 0x7c00;
 374             break;
 375         case VLC_CODEC_RGB16:
 376             fmt.video.i_rmask = 0x001f;
 377             fmt.video.i_gmask = 0x07e0;
 378             fmt.video.i_bmask = 0xf800;
 379             break;
 380         case VLC_CODEC_RGB24:
 381         case VLC_CODEC_RGB32:
 382             fmt.video.i_rmask = 0x00ff0000;
 383             fmt.video.i_gmask = 0x0000ff00;
 384             fmt.video.i_bmask = 0x000000ff;
 385             break;
 386     }
 387
 388     msg_Dbg( p_demux, "added new video es %4.4s %dx%d",
 389              (char*)&fmt.i_codec, fmt.video.i_width, fmt.video.i_height );
 390     p_sys->p_es = es_out_Add( p_demux->out, &fmt );
 391
 392     /* Update default_pts to a suitable value for access */
 393     var_Create( p_demux, "v4l-caching", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 394
 395     return VLC_SUCCESS;
 396 }
 397
 398 /*****************************************************************************
 399  * Close: close device, free resources
 400  *****************************************************************************/
 401 static void Close( vlc_object_t *p_this )
 402 {
 403     demux_t     *p_demux = (demux_t *)p_this;
 404     demux_sys_t *p_sys   = p_demux->p_sys;
 405
 406     free( p_sys->psz_device );
 407     if( p_sys->i_fd >= 0 ) v4l1_close( p_sys->i_fd );
 408
 409     if( p_sys->b_mjpeg )
 410     {
 411         int i_noframe = -1;
 412         v4l1_ioctl( p_sys->i_fd, MJPIOC_QBUF_CAPT, &i_noframe );
 413     }
 414
 415     if( p_sys->p_video_mmap && p_sys->p_video_mmap != MAP_FAILED )
 416     {
 417         if( p_sys->b_mjpeg )
 418             v4l1_munmap( p_sys->p_video_mmap, p_sys->mjpeg_buffers.size *
 419                     p_sys->mjpeg_buffers.count );
 420         else
 421             v4l1_munmap( p_sys->p_video_mmap, p_sys->vid_mbuf.size );
 422     }
 423
 424     free( p_sys );
 425 }
 426
 427 /*****************************************************************************
 428  * Control:
 429  *****************************************************************************/
 430 static int Control( demux_t *p_demux, int i_query, va_list args )
 431 {
 432     bool *pb;
 433     int64_t    *pi64;
 434
 435     switch( i_query )
 436     {
 437         /* Special for access_demux */
 438         case DEMUX_CAN_PAUSE:
 439         case DEMUX_CAN_SEEK:
 440         case DEMUX_CAN_CONTROL_PACE:
 441             pb = (bool*)va_arg( args, bool * );
 442             *pb = false;
 443             return VLC_SUCCESS;
 444
 445         case DEMUX_GET_PTS_DELAY:
 446             pi64 = (int64_t*)va_arg( args, int64_t * );
 447             *pi64 = var_GetInteger( p_demux, "v4l-caching" ) * 1000;
 448             return VLC_SUCCESS;
 449
 450         case DEMUX_GET_TIME:
 451             pi64 = (int64_t*)va_arg( args, int64_t * );
 452             *pi64 = mdate();
 453             return VLC_SUCCESS;
 454
 455         /* TODO implement others */
 456         default:
 457             return VLC_EGENERIC;
 458     }
 459
 460     return VLC_EGENERIC;
 461 }
 462
 463 /*****************************************************************************
 464  * Demux:
 465  *****************************************************************************/
 466 static int Demux( demux_t *p_demux )
 467 {
 468     demux_sys_t *p_sys = p_demux->p_sys;
 469
 470     block_t *p_block = GrabVideo( p_demux );
 471
 472     if( !p_block )
 473     {
 474         msleep( 10000 ); /* Unfortunately v4l doesn't allow polling */
 475         return 1;
 476     }
 477
 478     es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
 479     es_out_Send( p_demux->out, p_sys->p_es, p_block );
 480
 481     return 1;
 482 }
 483
 484 /*****************************************************************************
 485  * ParseMRL: parse the options contained in the MRL
 486  *****************************************************************************/
 487 static void ParseMRL( demux_t *p_demux )
 488 {
 489     demux_sys_t *p_sys = p_demux->p_sys;
 490
 491     char *psz_dup = strdup( p_demux->psz_location );
 492     char *psz_parser = psz_dup;
 493
 494     while( *psz_parser && *psz_parser != ':' )
 495     {
 496         psz_parser++;
 497     }
 498
 499     if( *psz_parser == ':' )
 500     {
 501         /* read options */
 502         for( ;; )
 503         {
 504             *psz_parser++ = '\0';
 505             if( !strncmp( psz_parser, "channel=", strlen( "channel=" ) ) )
 506             {
 507                 p_sys->i_channel = strtol( psz_parser + strlen( "channel=" ),
 508                                            &psz_parser, 0 );
 509             }
 510             else if( !strncmp( psz_parser, "norm=", strlen( "norm=" ) ) )
 511             {
 512                 psz_parser += strlen( "norm=" );
 513                 if( !strncmp( psz_parser, "pal", strlen( "pal" ) ) )
 514                 {
 515                     p_sys->i_norm = VIDEO_MODE_PAL;
 516                     psz_parser += strlen( "pal" );
 517                 }
 518                 else if( !strncmp( psz_parser, "ntsc", strlen( "ntsc" ) ) )
 519                 {
 520                     p_sys->i_norm = VIDEO_MODE_NTSC;
 521                     psz_parser += strlen( "ntsc" );
 522                 }
 523                 else if( !strncmp( psz_parser, "secam", strlen( "secam" ) ) )
 524                 {
 525                     p_sys->i_norm = VIDEO_MODE_SECAM;
 526                     psz_parser += strlen( "secam" );
 527                 }
 528                 else if( !strncmp( psz_parser, "auto", strlen( "auto" ) ) )
 529                 {
 530                     p_sys->i_norm = VIDEO_MODE_AUTO;
 531                     psz_parser += strlen( "auto" );
 532                 }
 533                 else
 534                 {
 535                     p_sys->i_norm = strtol( psz_parser, &psz_parser, 0 );
 536                 }
 537             }
 538             else if( !strncmp( psz_parser, "frequency=",
 539                                strlen( "frequency=" ) ) )
 540             {
 541                 p_sys->i_frequency =
 542                     strtol( psz_parser + strlen( "frequency=" ),
 543                             &psz_parser, 0 );
 544                 if( p_sys->i_frequency < 30000 )
 545                 {
 546                     msg_Warn( p_demux, "v4l syntax has changed : "
 547                               "'frequency' is now channel frequency in kHz");
 548                 }
 549             }
 550             else if( !strncmp( psz_parser, "audio=", strlen( "audio=" ) ) )
 551             {
 552                 p_sys->i_audio = strtol( psz_parser + strlen( "audio=" ),
 553                                          &psz_parser, 0 );
 554             }
 555             else if( !strncmp( psz_parser, "size=", strlen( "size=" ) ) )
 556             {
 557                 psz_parser += strlen( "size=" );
 558                 if( !strncmp( psz_parser, "subqcif", strlen( "subqcif" ) ) )
 559                 {
 560                     p_sys->i_width  = 128;
 561                     p_sys->i_height = 96;
 562                 }
 563                 else if( !strncmp( psz_parser, "qsif", strlen( "qsif" ) ) )
 564                 {
 565                     p_sys->i_width  = 160;
 566                     p_sys->i_height = 120;
 567                 }
 568                 else if( !strncmp( psz_parser, "qcif", strlen( "qcif" ) ) )
 569                 {
 570                     p_sys->i_width  = 176;
 571                     p_sys->i_height = 144;
 572                 }
 573                 else if( !strncmp( psz_parser, "sif", strlen( "sif" ) ) )
 574                 {
 575                     p_sys->i_width  = 320;
 576                     p_sys->i_height = 244;
 577                 }
 578                 else if( !strncmp( psz_parser, "cif", strlen( "cif" ) ) )
 579                 {
 580                     p_sys->i_width  = 352;
 581                     p_sys->i_height = 288;
 582                 }
 583                 else if( !strncmp( psz_parser, "vga", strlen( "vga" ) ) )
 584                 {
 585                     p_sys->i_width  = 640;
 586                     p_sys->i_height = 480;
 587                 }
 588                 else
 589                 {
 590                     /* widthxheight */
 591                     p_sys->i_width = strtol( psz_parser, &psz_parser, 0 );
 592                     if( *psz_parser == 'x' || *psz_parser == 'X')
 593                     {
 594                         p_sys->i_height = strtol( psz_parser + 1,
 595                                                   &psz_parser, 0 );
 596                     }
 597                     msg_Dbg( p_demux, "WxH %dx%d", p_sys->i_width,
 598                              p_sys->i_height );
 599                 }
 600             }
 601             else if( !strncmp( psz_parser, "brightness=", strlen( "brightness=" ) ) )
 602             {
 603                 p_sys->i_brightness = strtol( psz_parser + strlen( "brightness=" ),
 604                                               &psz_parser, 0 );
 605             }
 606             else if( !strncmp( psz_parser, "colour=", strlen( "colour=" ) ) )
 607             {
 608                 p_sys->i_colour = strtol( psz_parser + strlen( "colour=" ),
 609                                           &psz_parser, 0 );
 610             }
 611             else if( !strncmp( psz_parser, "hue=", strlen( "hue=" ) ) )
 612             {
 613                 p_sys->i_hue = strtol( psz_parser + strlen( "hue=" ),
 614                                        &psz_parser, 0 );
 615             }
 616             else if( !strncmp( psz_parser, "contrast=", strlen( "contrast=" ) ) )
 617             {
 618                 p_sys->i_contrast = strtol( psz_parser + strlen( "contrast=" ),
 619                                             &psz_parser, 0 );
 620             }
 621             else if( !strncmp( psz_parser, "tuner=", strlen( "tuner=" ) ) )
 622             {
 623                 p_sys->i_tuner = strtol( psz_parser + strlen( "tuner=" ),
 624                                          &psz_parser, 0 );
 625             }
 626             else if( !strncmp( psz_parser, "mjpeg", strlen( "mjpeg" ) ) )
 627             {
 628                 psz_parser += strlen( "mjpeg" );
 629
 630                 p_sys->b_mjpeg = true;
 631             }
 632             else if( !strncmp( psz_parser, "decimation=",
 633                         strlen( "decimation=" ) ) )
 634             {
 635                 p_sys->i_decimation =
 636                     strtol( psz_parser + strlen( "decimation=" ),
 637                             &psz_parser, 0 );
 638             }
 639             else if( !strncmp( psz_parser, "quality=",
 640                         strlen( "quality=" ) ) )
 641             {
 642                 p_sys->i_quality =
 643                     strtol( psz_parser + strlen( "quality=" ),
 644                             &psz_parser, 0 );
 645             }
 646             else if( !strncmp( psz_parser, "fps=", strlen( "fps=" ) ) )
 647             {
 648                 p_sys->f_fps = us_strtof( psz_parser + strlen( "fps=" ),
 649                                           &psz_parser );
 650             }
 651             else if( !strncmp( psz_parser, "adev=", strlen( "adev=" ) )
 652              || !strncmp( psz_parser, "samplerate=", strlen( "samplerate=" ) )
 653              || !strncmp( psz_parser, "stereo", strlen( "stereo" ) )
 654              || !strncmp( psz_parser, "mono", strlen( "mono" ) ) )
 655             {
 656                 if( strchr( psz_parser, ':' ) )
 657                     psz_parser = strchr( psz_parser, ':' );
 658                 else
 659                     psz_parser += strlen( psz_parser );
 660                 msg_Err( p_demux, AUDIO_DEPRECATED_ERROR );
 661             }
 662             else
 663             {
 664                 msg_Warn( p_demux, "unknown option" );
 665             }
 666
 667             while( *psz_parser && *psz_parser != ':' )
 668             {
 669                 psz_parser++;
 670             }
 671
 672             if( *psz_parser == '\0' )
 673             {
 674                 break;
 675             }
 676         }
 677     }
 678
 679     if( *psz_dup )
 680         p_sys->psz_device = strdup( psz_dup );
 681     else
 682         p_sys->psz_device = strdup( V4L_DEFAULT );
 683     free( psz_dup );
 684 }
 685
 686 /*****************************************************************************
 687  * OpenVideoDev:
 688  *****************************************************************************/
 689 static int OpenVideoDev( demux_t *p_demux, char *psz_device )
 690 {
 691     demux_sys_t *p_sys = p_demux->p_sys;
 692     int i_fd;
 693
 694     struct video_channel vid_channel;
 695     struct mjpeg_params mjpeg;
 696     int i;
 697
 698     if( ( i_fd = v4l1_open( psz_device, O_RDWR ) ) < 0 )
 699     {
 700         msg_Err( p_demux, "cannot open device (%m)" );
 701         goto vdev_failed;
 702     }
 703
 704     if( v4l1_ioctl( i_fd, VIDIOCGCAP, &p_sys->vid_cap ) < 0 )
 705     {
 706         msg_Err( p_demux, "cannot get capabilities (%m)" );
 707         goto vdev_failed;
 708     }
 709
 710     msg_Dbg( p_demux,
 711              "V4L device %s %d channels %d audios %d < w < %d %d < h < %d",
 712              p_sys->vid_cap.name,
 713              p_sys->vid_cap.channels,
 714              p_sys->vid_cap.audios,
 715              p_sys->vid_cap.minwidth,  p_sys->vid_cap.maxwidth,
 716              p_sys->vid_cap.minheight, p_sys->vid_cap.maxheight );
 717
 718     if( p_sys->i_channel < 0 || p_sys->i_channel >= p_sys->vid_cap.channels )
 719     {
 720         msg_Dbg( p_demux, "invalid channel, falling back on channel 0" );
 721         p_sys->i_channel = 0;
 722     }
 723     if( p_sys->vid_cap.audios && p_sys->i_audio >= p_sys->vid_cap.audios )
 724     {
 725         msg_Dbg( p_demux, "invalid audio, falling back with no audio" );
 726         p_sys->i_audio = -1;
 727     }
 728
 729     if( p_sys->i_width < p_sys->vid_cap.minwidth ||
 730         p_sys->i_width > p_sys->vid_cap.maxwidth )
 731     {
 732         msg_Dbg( p_demux, "invalid width %i", p_sys->i_width );
 733         p_sys->i_width = 0;
 734     }
 735     if( p_sys->i_height < p_sys->vid_cap.minheight ||
 736         p_sys->i_height > p_sys->vid_cap.maxheight )
 737     {
 738         msg_Dbg( p_demux, "invalid height %i", p_sys->i_height );
 739         p_sys->i_height = 0;
 740     }
 741
 742     if( !( p_sys->vid_cap.type & VID_TYPE_CAPTURE ) )
 743     {
 744         msg_Err( p_demux, "cannot grab" );
 745         goto vdev_failed;
 746     }
 747
 748     vid_channel.channel = p_sys->i_channel;
 749     if( v4l1_ioctl( i_fd, VIDIOCGCHAN, &vid_channel ) < 0 )
 750     {
 751         msg_Err( p_demux, "cannot get channel infos (%m)" );
 752         goto vdev_failed;
 753     }
 754     msg_Dbg( p_demux,
 755              "setting channel %s(%d) %d tuners flags=0x%x type=0x%x norm=0x%x",
 756              vid_channel.name, vid_channel.channel, vid_channel.tuners,
 757              vid_channel.flags, vid_channel.type, vid_channel.norm );
 758
 759     if( p_sys->i_tuner >= vid_channel.tuners )
 760     {
 761         msg_Dbg( p_demux, "invalid tuner, falling back on tuner 0" );
 762         p_sys->i_tuner = 0;
 763     }
 764
 765     vid_channel.norm = p_sys->i_norm;
 766     if( v4l1_ioctl( i_fd, VIDIOCSCHAN, &vid_channel ) < 0 )
 767     {
 768         msg_Err( p_demux, "cannot set channel (%m)" );
 769         goto vdev_failed;
 770     }
 771
 772     if( vid_channel.flags & VIDEO_VC_TUNER )
 773     {
 774
 775         /* set tuner */
 776 #if 0
 777         struct video_tuner vid_tuner;
 778         if( p_sys->i_tuner >= 0 )
 779         {
 780             vid_tuner.tuner = p_sys->i_tuner;
 781             if( v4l1_ioctl( i_fd, VIDIOCGTUNER, &vid_tuner ) < 0 )
 782             {
 783                 msg_Err( p_demux, "cannot get tuner (%m)" );
 784                 goto vdev_failed;
 785             }
 786             msg_Dbg( p_demux, "tuner %s low=%d high=%d, flags=0x%x "
 787                      "mode=0x%x signal=0x%x",
 788                      vid_tuner.name, vid_tuner.rangelow, vid_tuner.rangehigh,
 789                      vid_tuner.flags, vid_tuner.mode, vid_tuner.signal );
 790
 791             msg_Dbg( p_demux, "setting tuner %s (%d)",
 792                      vid_tuner.name, vid_tuner.tuner );
 793
 794             /* FIXME FIXME to be checked FIXME FIXME */
 795             //vid_tuner.mode = p_sys->i_norm;
 796             if( v4l1_ioctl( i_fd, VIDIOCSTUNER, &vid_tuner ) < 0 )
 797             {
 798                 msg_Err( p_demux, "cannot set tuner (%m)" );
 799                 goto vdev_failed;
 800             }
 801         }
 802 #endif
 803
 804         /* Show a warning if frequency is < than 30000.
 805          * User is certainly usint old syntax. */
 806
 807
 808         /* set frequency */
 809         if( p_sys->i_frequency >= 0 )
 810         {
 811             int driver_frequency = p_sys->i_frequency * 16 /1000;
 812             if( v4l1_ioctl( i_fd, VIDIOCSFREQ, &driver_frequency ) < 0 )
 813             {
 814                 msg_Err( p_demux, "cannot set frequency (%m)" );
 815                 goto vdev_failed;
 816             }
 817             msg_Dbg( p_demux, "frequency %d (%d)", p_sys->i_frequency,
 818                                                    driver_frequency );
 819         }
 820     }
 821
 822     /* set audio */
 823     if( vid_channel.flags & VIDEO_VC_AUDIO )
 824     {
 825         struct video_audio      vid_audio;
 826
 827         /* XXX TODO volume, balance, ... */
 828         if( p_sys->i_audio >= 0 )
 829         {
 830             vid_audio.audio = p_sys->i_audio;
 831             if( v4l1_ioctl( i_fd, VIDIOCGAUDIO, &vid_audio ) < 0 )
 832             {
 833                 msg_Err( p_demux, "cannot get audio (%m)" );
 834                 goto vdev_failed;
 835             }
 836
 837             /* unmute audio */
 838             vid_audio.flags &= ~VIDEO_AUDIO_MUTE;
 839
 840             if( v4l1_ioctl( i_fd, VIDIOCSAUDIO, &vid_audio ) < 0 )
 841             {
 842                 msg_Err( p_demux, "cannot set audio (%m)" );
 843                 goto vdev_failed;
 844             }
 845         }
 846
 847     }
 848
 849     /* establish basic params with input and norm before feeling width
 850      * or height */
 851     if( p_sys->b_mjpeg )
 852     {
 853         struct quicktime_mjpeg_app1 p_app1;
 854         int32_t i_offset;
 855
 856         if( v4l1_ioctl( i_fd, MJPIOC_G_PARAMS, &mjpeg ) < 0 )
 857         {
 858             msg_Err( p_demux, "cannot get mjpeg params (%m)" );
 859             goto vdev_failed;
 860         }
 861         mjpeg.input = p_sys->i_channel;
 862         mjpeg.norm  = p_sys->i_norm;
 863         mjpeg.decimation = p_sys->i_decimation;
 864
 865         if( p_sys->i_width )
 866             mjpeg.img_width = p_sys->i_width / p_sys->i_decimation;
 867         if( p_sys->i_height )
 868             mjpeg.img_height = p_sys->i_height / p_sys->i_decimation;
 869
 870         /* establish Quicktime APP1 marker while we are here */
 871         mjpeg.APPn = 1;
 872         mjpeg.APP_len = 40;
 873
 874         /* aligned */
 875         p_app1.i_reserved = 0;
 876         p_app1.i_tag = VLC_FOURCC( 'm','j','p','g' );
 877         p_app1.i_field_size = 0;
 878         p_app1.i_padded_field_size = 0;
 879         p_app1.i_next_field = 0;
 880         /* XXX WARNING XXX */
 881         /* these's nothing magic about these values.  We are dangerously
 882          * assuming the encoder card is encoding mjpeg-a and is not throwing
 883          * in marker tags we aren't expecting.  It's bad enough we have to
 884          * search through the jpeg output for every frame we grab just to
 885          * find the first field's end marker, so we take this risk to boost
 886          * performance.
 887          * This is really something the driver could do for us because this
 888          * does conform to standards outside of Apple Quicktime.
 889          */
 890         i_offset = 0x2e;
 891         p_app1.i_DQT_offset = hton32( i_offset );
 892         i_offset = 0xb4;
 893         p_app1.i_DHT_offset = hton32( i_offset );
 894         i_offset = 0x258;
 895         p_app1.i_SOF_offset = hton32( i_offset );
 896         i_offset = 0x26b;
 897         p_app1.i_SOS_offset = hton32( i_offset );
 898         i_offset = 0x279;
 899         p_app1.i_data_offset = hton32( i_offset );
 900         memcpy(mjpeg.APP_data, &p_app1, sizeof(struct quicktime_mjpeg_app1));
 901
 902         /* SOF and SOS aren't specified by the mjpeg API because they aren't
 903          * optional.  They will be present in the output. */
 904         mjpeg.jpeg_markers = JPEG_MARKER_DHT | JPEG_MARKER_DQT;
 905
 906         if( v4l1_ioctl( i_fd, MJPIOC_S_PARAMS, &mjpeg ) < 0 )
 907         {
 908             msg_Err( p_demux, "cannot set mjpeg params (%m)" );
 909             goto vdev_failed;
 910         }
 911
 912         p_sys->i_width = mjpeg.img_width * mjpeg.HorDcm;
 913         p_sys->i_height = mjpeg.img_height * mjpeg.VerDcm *
 914             mjpeg.field_per_buff;
 915     }
 916
 917     /* fix width/height */
 918     if( !p_sys->b_mjpeg && ( p_sys->i_width == 0 || p_sys->i_height == 0 ) )
 919     {
 920         struct video_window vid_win;
 921
 922         if( v4l1_ioctl( i_fd, VIDIOCGWIN, &vid_win ) < 0 )
 923         {
 924             msg_Err( p_demux, "cannot get win (%m)" );
 925             goto vdev_failed;
 926         }
 927         p_sys->i_width  = vid_win.width;
 928         p_sys->i_height = vid_win.height;
 929
 930         if( !p_sys->i_width || !p_sys->i_height )
 931         {
 932             p_sys->i_width = p_sys->vid_cap.maxwidth;
 933             p_sys->i_height = p_sys->vid_cap.maxheight;
 934         }
 935
 936         if( !p_sys->i_width || !p_sys->i_height )
 937         {
 938             msg_Err( p_demux, "invalid video size (%ix%i)",
 939                      p_sys->i_width, p_sys->i_height );
 940             goto vdev_failed;
 941         }
 942
 943         msg_Dbg( p_demux, "will use %dx%d", p_sys->i_width, p_sys->i_height );
 944     }
 945
 946     if( !p_sys->b_mjpeg )
 947     {
 948         /* set hue/color/.. */
 949         if( v4l1_ioctl( i_fd, VIDIOCGPICT, &p_sys->vid_picture ) == 0 )
 950         {
 951             struct video_picture vid_picture = p_sys->vid_picture;
 952
 953             if( p_sys->i_brightness >= 0 && p_sys->i_brightness < 65536 )
 954             {
 955                 vid_picture.brightness = p_sys->i_brightness;
 956             }
 957             if( p_sys->i_colour >= 0 && p_sys->i_colour < 65536 )
 958             {
 959                 vid_picture.colour = p_sys->i_colour;
 960             }
 961             if( p_sys->i_hue >= 0 && p_sys->i_hue < 65536 )
 962             {
 963                 vid_picture.hue = p_sys->i_hue;
 964             }
 965             if( p_sys->i_contrast  >= 0 && p_sys->i_contrast < 65536 )
 966             {
 967                 vid_picture.contrast = p_sys->i_contrast;
 968             }
 969             if( v4l1_ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
 970             {
 971                 msg_Dbg( p_demux, "v4l device uses brightness: %d",
 972                          vid_picture.brightness );
 973                 msg_Dbg( p_demux, "v4l device uses colour: %d",
 974                          vid_picture.colour );
 975                 msg_Dbg( p_demux, "v4l device uses hue: %d", vid_picture.hue );
 976                 msg_Dbg( p_demux, "v4l device uses contrast: %d",
 977                          vid_picture.contrast );
 978                 p_sys->vid_picture = vid_picture;
 979             }
 980         }
 981
 982         /* Find out video format used by device */
 983         if( v4l1_ioctl( i_fd, VIDIOCGPICT, &p_sys->vid_picture ) == 0 )
 984         {
 985             struct video_picture vid_picture = p_sys->vid_picture;
 986             char *psz;
 987             int i;
 988
 989             p_sys->i_fourcc = 0;
 990
 991             psz = var_CreateGetString( p_demux, "v4l-chroma" );
 992
 993             const vlc_fourcc_t i_chroma =
 994                 vlc_fourcc_GetCodecFromString( VIDEO_ES, psz );
 995             if( i_chroma )
 996             {
 997                 vid_picture.palette = 0;
 998
 999                 /* Find out v4l chroma code */
1000                 for( i = 0; v4lchroma_to_fourcc[i].i_v4l != 0; i++ )
1001                 {
1002                     if( v4lchroma_to_fourcc[i].i_fourcc == i_chroma )
1003                     {
1004                         vid_picture.palette = v4lchroma_to_fourcc[i].i_v4l;
1005                         break;
1006                     }
1007                 }
1008             }
1009             free( psz );
1010
1011             if( vid_picture.palette &&
1012                 !v4l1_ioctl( i_fd, VIDIOCSPICT, &vid_picture ) )
1013             {
1014                 p_sys->vid_picture = vid_picture;
1015             }
1016             else
1017             {
1018                 /* Try to set the format to something easy to encode */
1019                 vid_picture.palette = VIDEO_PALETTE_YUV420P;
1020                 if( v4l1_ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
1021                 {
1022                     p_sys->vid_picture = vid_picture;
1023                 }
1024                 else
1025                 {
1026                     vid_picture.palette = VIDEO_PALETTE_YUV422P;
1027                     if( v4l1_ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
1028                     {
1029                         p_sys->vid_picture = vid_picture;
1030                     }
1031                 }
1032             }
1033
1034             /* Find out final format */
1035             for( i = 0; v4lchroma_to_fourcc[i].i_v4l != 0; i++ )
1036             {
1037                 if( v4lchroma_to_fourcc[i].i_v4l == p_sys->vid_picture.palette)
1038                 {
1039                     p_sys->i_fourcc = v4lchroma_to_fourcc[i].i_fourcc;
1040                     break;
1041                 }
1042             }
1043         }
1044         else
1045         {
1046             msg_Err( p_demux, "ioctl VIDIOCGPICT failed" );
1047             goto vdev_failed;
1048         }
1049     }
1050
1051     if( p_sys->b_mjpeg )
1052     {
1053         int i;
1054
1055         p_sys->mjpeg_buffers.count = 8;
1056         p_sys->mjpeg_buffers.size = MJPEG_BUFFER_SIZE;
1057
1058         if( v4l1_ioctl( i_fd, MJPIOC_REQBUFS, &p_sys->mjpeg_buffers ) < 0 )
1059         {
1060             msg_Err( p_demux, "mmap unsupported" );
1061             goto vdev_failed;
1062         }
1063
1064         p_sys->p_video_mmap = v4l1_mmap( 0,
1065                 p_sys->mjpeg_buffers.size * p_sys->mjpeg_buffers.count,
1066                 PROT_READ | PROT_WRITE, MAP_SHARED, i_fd, 0 );
1067         if( p_sys->p_video_mmap == MAP_FAILED )
1068         {
1069             msg_Err( p_demux, "mmap failed" );
1070             goto vdev_failed;
1071         }
1072
1073         p_sys->i_fourcc  = VLC_CODEC_MJPG;
1074         p_sys->i_frame_pos = -1;
1075
1076         /* queue up all the frames */
1077         for( i = 0; i < (int)p_sys->mjpeg_buffers.count; i++ )
1078         {
1079             if( v4l1_ioctl( i_fd, MJPIOC_QBUF_CAPT, &i ) < 0 )
1080             {
1081                 msg_Err( p_demux, "unable to queue frame" );
1082                 goto vdev_failed;
1083             }
1084         }
1085     }
1086     else
1087     {
1088         /* Fill in picture_t fields */
1089         if( picture_Setup( &p_sys->pic, p_sys->i_fourcc,
1090                            p_sys->i_width, p_sys->i_height,
1091                            1, 1 ) )
1092         {
1093             msg_Err( p_demux, "unsupported chroma" );
1094             goto vdev_failed;
1095         }
1096         p_sys->i_video_frame_size = 0;
1097         for( i = 0; i < p_sys->pic.i_planes; i++ )
1098         {
1099             p_sys->i_video_frame_size += p_sys->pic.p[i].i_visible_lines *
1100               p_sys->pic.p[i].i_visible_pitch;
1101         }
1102
1103         msg_Dbg( p_demux, "v4l device uses frame size: %i",
1104                  p_sys->i_video_frame_size );
1105         msg_Dbg( p_demux, "v4l device uses chroma: %4.4s",
1106                 (char*)&p_sys->i_fourcc );
1107
1108         /* Allocate mmap buffer */
1109         if( v4l1_ioctl( i_fd, VIDIOCGMBUF, &p_sys->vid_mbuf ) < 0 )
1110         {
1111             msg_Err( p_demux, "mmap unsupported" );
1112             goto vdev_failed;
1113         }
1114
1115         p_sys->p_video_mmap = v4l1_mmap( 0, p_sys->vid_mbuf.size,
1116                                     PROT_READ|PROT_WRITE, MAP_SHARED,
1117                                     i_fd, 0 );
1118         if( p_sys->p_video_mmap == MAP_FAILED )
1119         {
1120             /* FIXME -> normal read */
1121             msg_Err( p_demux, "mmap failed" );
1122             goto vdev_failed;
1123         }
1124
1125         /* init grabbing */
1126         p_sys->vid_mmap.frame  = 0;
1127         p_sys->vid_mmap.width  = p_sys->i_width;
1128         p_sys->vid_mmap.height = p_sys->i_height;
1129         p_sys->vid_mmap.format = p_sys->vid_picture.palette;
1130         if( v4l1_ioctl( i_fd, VIDIOCMCAPTURE, &p_sys->vid_mmap ) < 0 )
1131         {
1132             msg_Warn( p_demux, "%4.4s refused", (char*)&p_sys->i_fourcc );
1133             msg_Err( p_demux, "chroma selection failed" );
1134             goto vdev_failed;
1135         }
1136     }
1137     return i_fd;
1138
1139 vdev_failed:
1140
1141     if( i_fd >= 0 ) v4l1_close( i_fd );
1142     return -1;
1143 }
1144
1145 /*****************************************************************************
1146  * GrabVideo:
1147  *****************************************************************************/
1148 static uint8_t *GrabCapture( demux_t *p_demux )
1149 {
1150     demux_sys_t *p_sys = p_demux->p_sys;
1151     int i_captured_frame = p_sys->i_frame_pos;
1152
1153     p_sys->vid_mmap.frame = (p_sys->i_frame_pos + 1) % p_sys->vid_mbuf.frames;
1154
1155     while( v4l1_ioctl( p_sys->i_fd, VIDIOCMCAPTURE, &p_sys->vid_mmap ) < 0 )
1156     {
1157         if( errno != EAGAIN )
1158         {
1159             msg_Err( p_demux, "failed capturing new frame" );
1160             return NULL;
1161         }
1162
1163         if( !vlc_object_alive (p_demux) )
1164         {
1165             return NULL;
1166         }
1167
1168         msg_Dbg( p_demux, "grab failed, trying again" );
1169     }
1170
1171     while( v4l1_ioctl(p_sys->i_fd, VIDIOCSYNC, &p_sys->i_frame_pos) < 0 )
1172     {
1173         if( errno != EAGAIN && errno != EINTR )
1174         {
1175             msg_Err( p_demux, "failed syncing new frame" );
1176             return NULL;
1177         }
1178     }
1179
1180     p_sys->i_frame_pos = p_sys->vid_mmap.frame;
1181     /* leave i_video_frame_size alone */
1182     return p_sys->p_video_mmap + p_sys->vid_mbuf.offsets[i_captured_frame];
1183 }
1184
1185 static uint8_t *GrabMJPEG( demux_t *p_demux )
1186 {
1187     demux_sys_t *p_sys = p_demux->p_sys;
1188     struct mjpeg_sync sync;
1189     uint8_t *p_frame, *p_field, *p;
1190     uint16_t tag;
1191     uint32_t i_size;
1192     struct quicktime_mjpeg_app1 *p_app1 = NULL;
1193
1194     /* re-queue the last frame we sync'd */
1195     if( p_sys->i_frame_pos != -1 )
1196     {
1197         while( v4l1_ioctl( p_sys->i_fd, MJPIOC_QBUF_CAPT,
1198                                        &p_sys->i_frame_pos ) < 0 )
1199         {
1200             if( errno != EAGAIN && errno != EINTR )
1201             {
1202                 msg_Err( p_demux, "failed capturing new frame" );
1203                 return NULL;
1204             }
1205         }
1206     }
1207
1208     /* sync on the next frame */
1209     while( v4l1_ioctl( p_sys->i_fd, MJPIOC_SYNC, &sync ) < 0 )
1210     {
1211         if( errno != EAGAIN && errno != EINTR )
1212         {
1213             msg_Err( p_demux, "failed syncing new frame" );
1214             return NULL;
1215         }
1216     }
1217
1218     p_sys->i_frame_pos = sync.frame;
1219     p_frame = p_sys->p_video_mmap + p_sys->mjpeg_buffers.size * sync.frame;
1220
1221     /* p_frame now points to the data.  fix up the Quicktime APP1 marker */
1222     tag = 0xffd9;
1223     tag = hton16( tag );
1224     p_field = p_frame;
1225
1226     /* look for EOI */
1227     p = memmem( p_field, sync.length, &tag, 2 );
1228
1229     if( p )
1230     {
1231         p += 2; /* data immediately following EOI */
1232         /* UNALIGNED! */
1233         p_app1 = (struct quicktime_mjpeg_app1 *)(p_field + 6);
1234
1235         i_size = ((uint32_t)(p - p_field));
1236         i_size = hton32( i_size );
1237         memcpy( &p_app1->i_field_size, &i_size, 4 );
1238
1239         while( *p == 0xff && *(p+1) == 0xff )
1240             p++;
1241
1242         i_size = ((uint32_t)(p - p_field));
1243         i_size = hton32( i_size );
1244         memcpy( &p_app1->i_padded_field_size, &i_size, 4 );
1245     }
1246
1247     tag = 0xffd8;
1248     tag = hton16( tag );
1249     p_field = memmem( p, sync.length - (size_t)(p - p_frame), &tag, 2 );
1250
1251     if( p_field )
1252     {
1253         i_size = (uint32_t)(p_field - p_frame);
1254         i_size = hton32( i_size );
1255         memcpy( &p_app1->i_next_field, &i_size, 4 );
1256
1257         /* UNALIGNED! */
1258         p_app1 = (struct quicktime_mjpeg_app1 *)(p_field + 6);
1259         tag = 0xffd9;
1260         tag = hton16( tag );
1261         p = memmem( p_field, sync.length - (size_t)(p_field - p_frame),
1262                 &tag, 2 );
1263
1264         if( !p )
1265         {
1266             /* sometimes the second field doesn't have the EOI.  just put it
1267              * there
1268              */
1269             p = p_frame + sync.length;
1270             memcpy( p, &tag, 2 );
1271             sync.length += 2;
1272         }
1273
1274         p += 2;
1275         i_size = (uint32_t)(p - p_field);
1276         i_size = hton32( i_size );
1277         memcpy( &p_app1->i_field_size, &i_size, 4 );
1278         i_size = (uint32_t)(sync.length - (uint32_t)(p_field - p_frame));
1279         i_size = hton32( i_size );
1280         memcpy( &p_app1->i_padded_field_size, &i_size, 4 );
1281     }
1282
1283     p_sys->i_video_frame_size = sync.length;
1284     return p_frame;
1285 }
1286
1287 static block_t *GrabVideo( demux_t *p_demux )
1288 {
1289     demux_sys_t *p_sys = p_demux->p_sys;
1290     uint8_t     *p_frame;
1291     block_t     *p_block;
1292
1293     if( p_sys->f_fps >= 0.1 && p_sys->i_video_pts > 0 )
1294     {
1295         mtime_t i_dur = (mtime_t)((double)1000000 / (double)p_sys->f_fps);
1296
1297         /* Did we wait long enough ? (frame rate reduction) */
1298         if( p_sys->i_video_pts + i_dur > mdate() ) return 0;
1299     }
1300
1301     if( p_sys->b_mjpeg ) p_frame = GrabMJPEG( p_demux );
1302     else p_frame = GrabCapture( p_demux );
1303
1304     if( !p_frame ) return 0;
1305
1306     if( !( p_block = block_New( p_demux, p_sys->i_video_frame_size ) ) )
1307     {
1308         msg_Warn( p_demux, "cannot get block" );
1309         return 0;
1310     }
1311
1312     memcpy( p_block->p_buffer, p_frame, p_sys->i_video_frame_size );
1313     p_sys->i_video_pts = p_block->i_pts = p_block->i_dts = mdate();
1314
1315     return p_block;
1316 }