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

   1 /*****************************************************************************
   2  * v4l.c : Video4Linux input module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2002-2004 the VideoLAN team
   5  * $Id$
   6  *
   7  * Author: Laurent Aimar <fenrir@via.ecp.fr>
   8  *         Paul Forgey <paulf at aphrodite dot com>
   9  *         Gildas Bazin <gbazin@videolan.org>
  10  *         Benjamin Pracht <bigben at videolan dot org>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  25  *****************************************************************************/
  26
  27 /*****************************************************************************
  28  * Preamble
  29  *****************************************************************************/
  30
  31 #ifdef HAVE_CONFIG_H
  32 # include "config.h"
  33 #endif
  34
  35 #include <vlc_common.h>
  36 #include <vlc_plugin.h>
  37 #include <vlc_input.h>
  38 #include <vlc_demux.h>
  39 #include <vlc_access.h>
  40 #include <vlc_vout.h>
  41
  42 #include <sys/ioctl.h>
  43 #include <sys/mman.h>
  44 #include <fcntl.h>
  45 #include <arpa/inet.h>
  46
  47 /* From GStreamer's v4l plugin:
  48  * Because of some really cool feature in video4linux1, also known as
  49  * 'not including sys/types.h and sys/time.h', we had to include it
  50  * ourselves. In all their intelligence, these people decided to fix
  51  * this in the next version (video4linux2) in such a cool way that it
  52  * breaks all compilations of old stuff...
  53  * The real problem is actually that linux/time.h doesn't use proper
  54  * macro checks before defining types like struct timeval. The proper
  55  * fix here is to either fuck the kernel header (which is what we do
  56  * by defining _LINUX_TIME_H, an innocent little hack) or by fixing it
  57  * upstream, which I'll consider doing later on. If you get compiler
  58  * errors here, check your linux/time.h && sys/time.h header setup.
  59 */
  60 #define _LINUX_TIME_H
  61
  62 #include <linux/videodev.h>
  63 #include "videodev_mjpeg.h"
  64
  65 /*****************************************************************************
  66  * Module descriptior
  67  *****************************************************************************/
  68 static int  Open ( vlc_object_t * );
  69 static void Close( vlc_object_t * );
  70
  71 #define CACHING_TEXT N_("Caching value in ms")
  72 #define CACHING_LONGTEXT N_( \
  73     "Caching value for V4L captures. This " \
  74     "value should be set in milliseconds." )
  75 #define VDEV_TEXT N_("Video device name")
  76 #define VDEV_LONGTEXT N_( \
  77     "Name of the video device to use. " \
  78     "If you don't specify anything, no video device will be used.")
  79 #define CHROMA_TEXT N_("Video input chroma format")
  80 #define CHROMA_LONGTEXT N_( \
  81     "Force the Video4Linux video device to use a specific chroma format " \
  82     "(eg. I420 (default), RV24, etc.)")
  83 #define FREQUENCY_TEXT N_( "Frequency" )
  84 #define FREQUENCY_LONGTEXT N_( \
  85     "Frequency to capture (in kHz), if applicable." )
  86 #define CHANNEL_TEXT N_( "Channel" )
  87 #define CHANNEL_LONGTEXT N_( \
  88     "Channel of the card to use (Usually, 0 = tuner, " \
  89     "1 = composite, 2 = svideo)." )
  90 #define NORM_TEXT N_( "Norm" )
  91 #define NORM_LONGTEXT N_( \
  92     "Norm of the stream (Automatic, SECAM, PAL, or NTSC)." )
  93 #define AUDIO_TEXT N_( "Audio Channel" )
  94 #define AUDIO_LONGTEXT N_( \
  95     "Audio Channel to use, if there are several audio inputs." )
  96 #define WIDTH_TEXT N_( "Width" )
  97 #define WIDTH_LONGTEXT N_( "Width of the stream to capture " \
  98     "(-1 for autodetect)." )
  99 #define HEIGHT_TEXT N_( "Height" )
 100 #define HEIGHT_LONGTEXT N_( "Height of the stream to capture " \
 101     "(-1 for autodetect)." )
 102 #define BRIGHTNESS_TEXT N_( "Brightness" )
 103 #define BRIGHTNESS_LONGTEXT N_( \
 104     "Brightness of the video input." )
 105 #define HUE_TEXT N_( "Hue" )
 106 #define HUE_LONGTEXT N_( \
 107     "Hue of the video input." )
 108 #define COLOUR_TEXT N_( "Color" )
 109 #define COLOUR_LONGTEXT N_( \
 110     "Color of the video input." )
 111 #define CONTRAST_TEXT N_( "Contrast" )
 112 #define CONTRAST_LONGTEXT N_( \
 113     "Contrast of the video input." )
 114 #define TUNER_TEXT N_( "Tuner" )
 115 #define TUNER_LONGTEXT N_( "Tuner to use, if there are several ones." )
 116 #define MJPEG_TEXT N_( "MJPEG" )
 117 #define MJPEG_LONGTEXT N_(  \
 118     "Set this option if the capture device outputs MJPEG" )
 119 #define DECIMATION_TEXT N_( "Decimation" )
 120 #define DECIMATION_LONGTEXT N_( \
 121     "Decimation level for MJPEG streams" )
 122 #define QUALITY_TEXT N_( "Quality" )
 123 #define QUALITY_LONGTEXT N_( "Quality of the stream." )
 124 #define FPS_TEXT N_( "Framerate" )
 125 #define FPS_LONGTEXT N_( "Framerate to capture, if applicable " \
 126     "(-1 for autodetect)." )
 127
 128 #define AUDIO_DEPRECATED_ERROR N_( \
 129     "Alsa or OSS audio capture in the v4l access is deprecated. " \
 130     "please use 'v4l:/""/ :input-slave=alsa:/""/' or " \
 131     "'v4l:/""/ :input-slave=oss:/""/' instead." )
 132
 133 static const int i_norm_list[] =
 134     { VIDEO_MODE_AUTO, VIDEO_MODE_SECAM, VIDEO_MODE_PAL, VIDEO_MODE_NTSC };
 135 static const char *const psz_norm_list_text[] =
 136     { N_("Automatic"), N_("SECAM"), N_("PAL"),  N_("NTSC") };
 137
 138 #define V4L_DEFAULT "/dev/video"
 139
 140 vlc_module_begin ()
 141     set_shortname( N_("Video4Linux") )
 142     set_description( N_("Video4Linux input") )
 143     set_category( CAT_INPUT )
 144     set_subcategory( SUBCAT_INPUT_ACCESS )
 145
 146     add_integer( "v4l-caching", DEFAULT_PTS_DELAY / 1000, NULL,
 147                  CACHING_TEXT, CACHING_LONGTEXT, true )
 148     add_obsolete_string( "v4l-vdev" );
 149     add_obsolete_string( "v4l-adev" );
 150     add_string( "v4l-chroma", NULL, NULL, CHROMA_TEXT, CHROMA_LONGTEXT,
 151                 true )
 152     add_float( "v4l-fps", -1.0, NULL, FPS_TEXT, FPS_LONGTEXT, true )
 153     add_obsolete_integer( "v4l-samplerate" );
 154     add_integer( "v4l-channel", 0, NULL, CHANNEL_TEXT, CHANNEL_LONGTEXT,
 155                 true )
 156     add_integer( "v4l-tuner", -1, NULL, TUNER_TEXT, TUNER_LONGTEXT, true )
 157     add_integer( "v4l-norm", VIDEO_MODE_AUTO, NULL, NORM_TEXT, NORM_LONGTEXT,
 158                 false )
 159         change_integer_list( i_norm_list, psz_norm_list_text, NULL );
 160     add_integer( "v4l-frequency", -1, NULL, FREQUENCY_TEXT, FREQUENCY_LONGTEXT,
 161                 false )
 162     add_integer( "v4l-audio", -1, NULL, AUDIO_TEXT, AUDIO_LONGTEXT, true )
 163     add_obsolete_bool( "v4l-stereo" );
 164     add_integer( "v4l-width", 0, NULL, WIDTH_TEXT, WIDTH_LONGTEXT, true )
 165     add_integer( "v4l-height", 0, NULL, HEIGHT_TEXT, HEIGHT_LONGTEXT,
 166                 true )
 167     add_integer( "v4l-brightness", -1, NULL, BRIGHTNESS_TEXT,
 168                 BRIGHTNESS_LONGTEXT, true )
 169     add_integer( "v4l-colour", -1, NULL, COLOUR_TEXT, COLOUR_LONGTEXT,
 170                 true )
 171     add_integer( "v4l-hue", -1, NULL, HUE_TEXT, HUE_LONGTEXT, true )
 172     add_integer( "v4l-contrast", -1, NULL, CONTRAST_TEXT, CONTRAST_LONGTEXT,
 173                 true )
 174     add_bool( "v4l-mjpeg", false, NULL, MJPEG_TEXT, MJPEG_LONGTEXT,
 175             true )
 176     add_integer( "v4l-decimation", 1, NULL, DECIMATION_TEXT,
 177             DECIMATION_LONGTEXT, true )
 178     add_integer( "v4l-quality", 100, NULL, QUALITY_TEXT, QUALITY_LONGTEXT,
 179             true )
 180
 181     add_shortcut( "v4l" )
 182     set_capability( "access_demux", 10 )
 183     set_callbacks( Open, Close )
 184 vlc_module_end ()
 185
 186 /*****************************************************************************
 187  * Access: local prototypes
 188  *****************************************************************************/
 189 static int Demux  ( demux_t * );
 190 static int Control( demux_t *, int, va_list );
 191
 192 static void ParseMRL    ( demux_t * );
 193 static int  OpenVideoDev( demux_t *, char * );
 194 static block_t *GrabVideo( demux_t * );
 195
 196 #define MJPEG_BUFFER_SIZE (256*1024)
 197
 198 struct quicktime_mjpeg_app1
 199 {
 200     uint32_t    i_reserved;             /* set to 0 */
 201     uint32_t    i_tag;                  /* 'mjpg' */
 202     uint32_t    i_field_size;           /* offset following EOI */
 203     uint32_t    i_padded_field_size;    /* offset following EOI+pad */
 204     uint32_t    i_next_field;           /* offset to next field */
 205     uint32_t    i_DQT_offset;
 206     uint32_t    i_DHT_offset;
 207     uint32_t    i_SOF_offset;
 208     uint32_t    i_SOS_offset;
 209     uint32_t    i_data_offset;          /* following SOS marker data */
 210 };
 211
 212 static const struct
 213 {
 214     int i_v4l;
 215     int i_fourcc;
 216
 217 } v4lchroma_to_fourcc[] =
 218 {
 219     { VIDEO_PALETTE_GREY, VLC_FOURCC( 'G', 'R', 'E', 'Y' ) },
 220     { VIDEO_PALETTE_HI240, VLC_FOURCC( 'I', '2', '4', '0' ) },
 221     { VIDEO_PALETTE_RGB565, VLC_FOURCC( 'R', 'V', '1', '6' ) },
 222     { VIDEO_PALETTE_RGB555, VLC_FOURCC( 'R', 'V', '1', '5' ) },
 223     { VIDEO_PALETTE_RGB24, VLC_FOURCC( 'R', 'V', '2', '4' ) },
 224     { VIDEO_PALETTE_RGB32, VLC_FOURCC( 'R', 'V', '3', '2' ) },
 225     { VIDEO_PALETTE_YUV422, VLC_FOURCC( 'Y', 'U', 'Y', '2' ) },
 226     { VIDEO_PALETTE_YUV422, VLC_FOURCC( 'Y', 'U', 'Y', 'V' ) },
 227     { VIDEO_PALETTE_YUYV, VLC_FOURCC( 'Y', 'U', 'Y', '2' ) },
 228     { VIDEO_PALETTE_YUYV, VLC_FOURCC( 'Y', 'U', 'Y', 'V' ) },
 229     { VIDEO_PALETTE_UYVY, VLC_FOURCC( 'U', 'Y', 'V', 'Y' ) },
 230     { VIDEO_PALETTE_YUV420, VLC_FOURCC( 'I', '4', '2', 'N' ) },
 231     { VIDEO_PALETTE_YUV411, VLC_FOURCC( 'I', '4', '1', 'N' ) },
 232     { VIDEO_PALETTE_RAW, VLC_FOURCC( 'G', 'R', 'A', 'W' ) },
 233     { VIDEO_PALETTE_YUV422P, VLC_FOURCC( 'I', '4', '2', '2' ) },
 234     { VIDEO_PALETTE_YUV420P, VLC_FOURCC( 'I', '4', '2', '0' ) },
 235     { VIDEO_PALETTE_YUV411P, VLC_FOURCC( 'I', '4', '1', '1' ) },
 236     { 0, 0 }
 237 };
 238
 239 struct demux_sys_t
 240 {
 241     /* Devices */
 242     char *psz_device;         /* Main device from MRL */
 243     int  i_fd;
 244
 245     /* Video properties */
 246     picture_t pic;
 247
 248     int i_fourcc;
 249     int i_channel;
 250     int i_audio;
 251     int i_norm;
 252     int i_tuner;
 253     int i_frequency;
 254     int i_width;
 255     int i_height;
 256
 257     int i_brightness;
 258     int i_hue;
 259     int i_colour;
 260     int i_contrast;
 261
 262     float f_fps;            /* <= 0.0 mean to grab at full rate */
 263     mtime_t i_video_pts;    /* only used when f_fps > 0 */
 264
 265     bool b_mjpeg;
 266     int i_decimation;
 267     int i_quality;
 268
 269     struct video_capability vid_cap;
 270     struct video_mbuf       vid_mbuf;
 271     struct mjpeg_requestbuffers mjpeg_buffers;
 272
 273     uint8_t *p_video_mmap;
 274     int     i_frame_pos;
 275
 276     struct video_mmap   vid_mmap;
 277     struct video_picture vid_picture;
 278
 279     int          i_video_frame_size;
 280     es_out_id_t  *p_es;
 281 };
 282
 283 /*****************************************************************************
 284  * Open: opens v4l device
 285  *****************************************************************************
 286  *
 287  * url: <video device>::::
 288  *
 289  *****************************************************************************/
 290 static int Open( vlc_object_t *p_this )
 291 {
 292     demux_t     *p_demux = (demux_t*)p_this;
 293     demux_sys_t *p_sys;
 294
 295     /* Only when selected */
 296     if( *p_demux->psz_access == '\0' )
 297         return VLC_EGENERIC;
 298
 299     /* Set up p_demux */
 300     p_demux->pf_demux = Demux;
 301     p_demux->pf_control = Control;
 302     p_demux->info.i_update = 0;
 303     p_demux->info.i_title = 0;
 304     p_demux->info.i_seekpoint = 0;
 305     p_demux->p_sys = p_sys = calloc( 1, sizeof( demux_sys_t ) );
 306     if( !p_sys )
 307         return VLC_ENOMEM;
 308
 309     p_sys->i_audio      = var_CreateGetInteger( p_demux, "v4l-audio" );
 310     p_sys->i_channel    = var_CreateGetInteger( p_demux, "v4l-channel" );
 311     p_sys->i_norm       = var_CreateGetInteger( p_demux, "v4l-norm" );
 312     p_sys->i_tuner      = var_CreateGetInteger( p_demux, "v4l-tuner" );
 313     p_sys->i_frequency  = var_CreateGetInteger( p_demux, "v4l-frequency" );
 314
 315     p_sys->f_fps        = var_CreateGetFloat( p_demux, "v4l-fps" );
 316     p_sys->i_width      = var_CreateGetInteger( p_demux, "v4l-width" );
 317     p_sys->i_height     = var_CreateGetInteger( p_demux, "v4l-height" );
 318     p_sys->i_video_pts  = -1;
 319     p_sys->i_brightness = var_CreateGetInteger( p_demux, "v4l-brightness" );
 320
 321     p_sys->i_hue        = var_CreateGetInteger( p_demux, "v4l-hue" );
 322     p_sys->i_colour     = var_CreateGetInteger( p_demux, "v4l-colour" );
 323     p_sys->i_contrast   = var_CreateGetInteger( p_demux, "v4l-contrast" );
 324
 325     p_sys->b_mjpeg      = var_CreateGetBool( p_demux, "v4l-mjpeg" );
 326     p_sys->i_decimation = var_CreateGetInteger( p_demux, "v4l-decimation" );
 327     p_sys->i_quality    = var_CreateGetInteger( p_demux, "v4l-quality" );
 328
 329     p_sys->psz_device = NULL;
 330     p_sys->i_fd = -1;
 331
 332     p_sys->p_es = NULL;
 333
 334     ParseMRL( p_demux );
 335
 336     msg_Dbg( p_this, "opening device '%s'", p_sys->psz_device );
 337     p_sys->i_fd = OpenVideoDev( p_demux, p_sys->psz_device );
 338     if( p_sys->i_fd < 0 )
 339     {
 340         Close( p_this );
 341         return VLC_EGENERIC;
 342     }
 343
 344
 345     msg_Dbg( p_demux, "v4l grabbing started" );
 346
 347     /* Declare elementary streams */
 348     es_format_t fmt;
 349     es_format_Init( &fmt, VIDEO_ES, p_sys->i_fourcc );
 350     fmt.video.i_width  = p_sys->i_width;
 351     fmt.video.i_height = p_sys->i_height;
 352     fmt.video.i_aspect = 4 * VOUT_ASPECT_FACTOR / 3;
 353
 354     /* Setup rgb mask for RGB formats */
 355     switch( p_sys->i_fourcc )
 356     {
 357         case VLC_FOURCC('R','V','1','5'):
 358             fmt.video.i_rmask = 0x001f;
 359             fmt.video.i_gmask = 0x03e0;
 360             fmt.video.i_bmask = 0x7c00;
 361             break;
 362         case VLC_FOURCC('R','V','1','6'):
 363             fmt.video.i_rmask = 0x001f;
 364             fmt.video.i_gmask = 0x07e0;
 365             fmt.video.i_bmask = 0xf800;
 366             break;
 367         case VLC_FOURCC('R','V','2','4'):
 368         case VLC_FOURCC('R','V','3','2'):
 369             fmt.video.i_rmask = 0x00ff0000;
 370             fmt.video.i_gmask = 0x0000ff00;
 371             fmt.video.i_bmask = 0x000000ff;
 372             break;
 373     }
 374
 375     msg_Dbg( p_demux, "added new video es %4.4s %dx%d",
 376              (char*)&fmt.i_codec, fmt.video.i_width, fmt.video.i_height );
 377     p_sys->p_es = es_out_Add( p_demux->out, &fmt );
 378
 379     /* Update default_pts to a suitable value for access */
 380     var_Create( p_demux, "v4l-caching", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 381
 382     return VLC_SUCCESS;
 383 }
 384
 385 /*****************************************************************************
 386  * Close: close device, free resources
 387  *****************************************************************************/
 388 static void Close( vlc_object_t *p_this )
 389 {
 390     demux_t     *p_demux = (demux_t *)p_this;
 391     demux_sys_t *p_sys   = p_demux->p_sys;
 392
 393     free( p_sys->psz_device );
 394     if( p_sys->i_fd >= 0 ) close( p_sys->i_fd );
 395
 396     if( p_sys->b_mjpeg )
 397     {
 398         int i_noframe = -1;
 399         ioctl( p_sys->i_fd, MJPIOC_QBUF_CAPT, &i_noframe );
 400     }
 401
 402     if( p_sys->p_video_mmap && p_sys->p_video_mmap != MAP_FAILED )
 403     {
 404         if( p_sys->b_mjpeg )
 405             munmap( p_sys->p_video_mmap, p_sys->mjpeg_buffers.size *
 406                     p_sys->mjpeg_buffers.count );
 407         else
 408             munmap( p_sys->p_video_mmap, p_sys->vid_mbuf.size );
 409     }
 410
 411     free( p_sys );
 412 }
 413
 414 /*****************************************************************************
 415  * Control:
 416  *****************************************************************************/
 417 static int Control( demux_t *p_demux, int i_query, va_list args )
 418 {
 419     bool *pb;
 420     int64_t    *pi64;
 421
 422     switch( i_query )
 423     {
 424         /* Special for access_demux */
 425         case DEMUX_CAN_PAUSE:
 426         case DEMUX_CAN_SEEK:
 427         case DEMUX_SET_PAUSE_STATE:
 428         case DEMUX_CAN_CONTROL_PACE:
 429             pb = (bool*)va_arg( args, bool * );
 430             *pb = false;
 431             return VLC_SUCCESS;
 432
 433         case DEMUX_GET_PTS_DELAY:
 434             pi64 = (int64_t*)va_arg( args, int64_t * );
 435             *pi64 = (int64_t)var_GetInteger( p_demux, "v4l-caching" ) * 1000;
 436             return VLC_SUCCESS;
 437
 438         case DEMUX_GET_TIME:
 439             pi64 = (int64_t*)va_arg( args, int64_t * );
 440             *pi64 = mdate();
 441             return VLC_SUCCESS;
 442
 443         /* TODO implement others */
 444         default:
 445             return VLC_EGENERIC;
 446     }
 447
 448     return VLC_EGENERIC;
 449 }
 450
 451 /*****************************************************************************
 452  * Demux:
 453  *****************************************************************************/
 454 static int Demux( demux_t *p_demux )
 455 {
 456     demux_sys_t *p_sys = p_demux->p_sys;
 457
 458     block_t *p_block = GrabVideo( p_demux );
 459
 460     if( !p_block )
 461     {
 462         msleep( 10000 ); /* Unfortunately v4l doesn't allow polling */
 463         return 1;
 464     }
 465
 466     es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
 467     es_out_Send( p_demux->out, p_sys->p_es, p_block );
 468
 469     return 1;
 470 }
 471
 472 /*****************************************************************************
 473  * ParseMRL: parse the options contained in the MRL
 474  *****************************************************************************/
 475 static void ParseMRL( demux_t *p_demux )
 476 {
 477     demux_sys_t *p_sys = p_demux->p_sys;
 478
 479     char *psz_dup = strdup( p_demux->psz_path );
 480     char *psz_parser = psz_dup;
 481
 482     while( *psz_parser && *psz_parser != ':' )
 483     {
 484         psz_parser++;
 485     }
 486
 487     if( *psz_parser == ':' )
 488     {
 489         /* read options */
 490         for( ;; )
 491         {
 492             *psz_parser++ = '\0';
 493             if( !strncmp( psz_parser, "channel=", strlen( "channel=" ) ) )
 494             {
 495                 p_sys->i_channel = strtol( psz_parser + strlen( "channel=" ),
 496                                            &psz_parser, 0 );
 497             }
 498             else if( !strncmp( psz_parser, "norm=", strlen( "norm=" ) ) )
 499             {
 500                 psz_parser += strlen( "norm=" );
 501                 if( !strncmp( psz_parser, "pal", strlen( "pal" ) ) )
 502                 {
 503                     p_sys->i_norm = VIDEO_MODE_PAL;
 504                     psz_parser += strlen( "pal" );
 505                 }
 506                 else if( !strncmp( psz_parser, "ntsc", strlen( "ntsc" ) ) )
 507                 {
 508                     p_sys->i_norm = VIDEO_MODE_NTSC;
 509                     psz_parser += strlen( "ntsc" );
 510                 }
 511                 else if( !strncmp( psz_parser, "secam", strlen( "secam" ) ) )
 512                 {
 513                     p_sys->i_norm = VIDEO_MODE_SECAM;
 514                     psz_parser += strlen( "secam" );
 515                 }
 516                 else if( !strncmp( psz_parser, "auto", strlen( "auto" ) ) )
 517                 {
 518                     p_sys->i_norm = VIDEO_MODE_AUTO;
 519                     psz_parser += strlen( "auto" );
 520                 }
 521                 else
 522                 {
 523                     p_sys->i_norm = strtol( psz_parser, &psz_parser, 0 );
 524                 }
 525             }
 526             else if( !strncmp( psz_parser, "frequency=",
 527                                strlen( "frequency=" ) ) )
 528             {
 529                 p_sys->i_frequency =
 530                     strtol( psz_parser + strlen( "frequency=" ),
 531                             &psz_parser, 0 );
 532                 if( p_sys->i_frequency < 30000 )
 533                 {
 534                     msg_Warn( p_demux, "v4l syntax has changed : "
 535                               "'frequency' is now channel frequency in kHz");
 536                 }
 537             }
 538             else if( !strncmp( psz_parser, "audio=", strlen( "audio=" ) ) )
 539             {
 540                 p_sys->i_audio = strtol( psz_parser + strlen( "audio=" ),
 541                                          &psz_parser, 0 );
 542             }
 543             else if( !strncmp( psz_parser, "size=", strlen( "size=" ) ) )
 544             {
 545                 psz_parser += strlen( "size=" );
 546                 if( !strncmp( psz_parser, "subqcif", strlen( "subqcif" ) ) )
 547                 {
 548                     p_sys->i_width  = 128;
 549                     p_sys->i_height = 96;
 550                 }
 551                 else if( !strncmp( psz_parser, "qsif", strlen( "qsif" ) ) )
 552                 {
 553                     p_sys->i_width  = 160;
 554                     p_sys->i_height = 120;
 555                 }
 556                 else if( !strncmp( psz_parser, "qcif", strlen( "qcif" ) ) )
 557                 {
 558                     p_sys->i_width  = 176;
 559                     p_sys->i_height = 144;
 560                 }
 561                 else if( !strncmp( psz_parser, "sif", strlen( "sif" ) ) )
 562                 {
 563                     p_sys->i_width  = 320;
 564                     p_sys->i_height = 244;
 565                 }
 566                 else if( !strncmp( psz_parser, "cif", strlen( "cif" ) ) )
 567                 {
 568                     p_sys->i_width  = 352;
 569                     p_sys->i_height = 288;
 570                 }
 571                 else if( !strncmp( psz_parser, "vga", strlen( "vga" ) ) )
 572                 {
 573                     p_sys->i_width  = 640;
 574                     p_sys->i_height = 480;
 575                 }
 576                 else
 577                 {
 578                     /* widthxheight */
 579                     p_sys->i_width = strtol( psz_parser, &psz_parser, 0 );
 580                     if( *psz_parser == 'x' || *psz_parser == 'X')
 581                     {
 582                         p_sys->i_height = strtol( psz_parser + 1,
 583                                                   &psz_parser, 0 );
 584                     }
 585                     msg_Dbg( p_demux, "WxH %dx%d", p_sys->i_width,
 586                              p_sys->i_height );
 587                 }
 588             }
 589             else if( !strncmp( psz_parser, "brightness=", strlen( "brightness=" ) ) )
 590             {
 591                 p_sys->i_brightness = strtol( psz_parser + strlen( "brightness=" ),
 592                                               &psz_parser, 0 );
 593             }
 594             else if( !strncmp( psz_parser, "colour=", strlen( "colour=" ) ) )
 595             {
 596                 p_sys->i_colour = strtol( psz_parser + strlen( "colour=" ),
 597                                           &psz_parser, 0 );
 598             }
 599             else if( !strncmp( psz_parser, "hue=", strlen( "hue=" ) ) )
 600             {
 601                 p_sys->i_hue = strtol( psz_parser + strlen( "hue=" ),
 602                                        &psz_parser, 0 );
 603             }
 604             else if( !strncmp( psz_parser, "contrast=", strlen( "contrast=" ) ) )
 605             {
 606                 p_sys->i_contrast = strtol( psz_parser + strlen( "contrast=" ),
 607                                             &psz_parser, 0 );
 608             }
 609             else if( !strncmp( psz_parser, "tuner=", strlen( "tuner=" ) ) )
 610             {
 611                 p_sys->i_tuner = strtol( psz_parser + strlen( "tuner=" ),
 612                                          &psz_parser, 0 );
 613             }
 614             else if( !strncmp( psz_parser, "mjpeg", strlen( "mjpeg" ) ) )
 615             {
 616                 psz_parser += strlen( "mjpeg" );
 617
 618                 p_sys->b_mjpeg = true;
 619             }
 620             else if( !strncmp( psz_parser, "decimation=",
 621                         strlen( "decimation=" ) ) )
 622             {
 623                 p_sys->i_decimation =
 624                     strtol( psz_parser + strlen( "decimation=" ),
 625                             &psz_parser, 0 );
 626             }
 627             else if( !strncmp( psz_parser, "quality=",
 628                         strlen( "quality=" ) ) )
 629             {
 630                 p_sys->i_quality =
 631                     strtol( psz_parser + strlen( "quality=" ),
 632                             &psz_parser, 0 );
 633             }
 634             else if( !strncmp( psz_parser, "fps=", strlen( "fps=" ) ) )
 635             {
 636                 p_sys->f_fps = strtof( psz_parser + strlen( "fps=" ),
 637                                        &psz_parser );
 638             }
 639             else if( !strncmp( psz_parser, "adev=", strlen( "adev=" ) )
 640              || !strncmp( psz_parser, "samplerate=", strlen( "samplerate=" ) )
 641              || !strncmp( psz_parser, "stereo", strlen( "stereo" ) )
 642              || !strncmp( psz_parser, "mono", strlen( "mono" ) ) )
 643             {
 644                 if( strchr( psz_parser, ':' ) )
 645                     psz_parser = strchr( psz_parser, ':' );
 646                 else
 647                     psz_parser += strlen( psz_parser );
 648                 msg_Err( p_demux, AUDIO_DEPRECATED_ERROR );
 649             }
 650             else
 651             {
 652                 msg_Warn( p_demux, "unknown option" );
 653             }
 654
 655             while( *psz_parser && *psz_parser != ':' )
 656             {
 657                 psz_parser++;
 658             }
 659
 660             if( *psz_parser == '\0' )
 661             {
 662                 break;
 663             }
 664         }
 665     }
 666
 667     if( *psz_dup )
 668         p_sys->psz_device = strdup( psz_dup );
 669     else
 670         p_sys->psz_device = strdup( V4L_DEFAULT );
 671     free( psz_dup );
 672 }
 673
 674 /*****************************************************************************
 675  * OpenVideoDev:
 676  *****************************************************************************/
 677 static int OpenVideoDev( demux_t *p_demux, char *psz_device )
 678 {
 679     demux_sys_t *p_sys = p_demux->p_sys;
 680     int i_fd;
 681
 682     struct video_channel vid_channel;
 683     struct mjpeg_params mjpeg;
 684     int i;
 685
 686     if( ( i_fd = open( psz_device, O_RDWR ) ) < 0 )
 687     {
 688         msg_Err( p_demux, "cannot open device (%m)" );
 689         goto vdev_failed;
 690     }
 691
 692     if( ioctl( i_fd, VIDIOCGCAP, &p_sys->vid_cap ) < 0 )
 693     {
 694         msg_Err( p_demux, "cannot get capabilities (%m)" );
 695         goto vdev_failed;
 696     }
 697
 698     msg_Dbg( p_demux,
 699              "V4L device %s %d channels %d audios %d < w < %d %d < h < %d",
 700              p_sys->vid_cap.name,
 701              p_sys->vid_cap.channels,
 702              p_sys->vid_cap.audios,
 703              p_sys->vid_cap.minwidth,  p_sys->vid_cap.maxwidth,
 704              p_sys->vid_cap.minheight, p_sys->vid_cap.maxheight );
 705
 706     if( p_sys->i_channel < 0 || p_sys->i_channel >= p_sys->vid_cap.channels )
 707     {
 708         msg_Dbg( p_demux, "invalid channel, falling back on channel 0" );
 709         p_sys->i_channel = 0;
 710     }
 711     if( p_sys->vid_cap.audios && p_sys->i_audio >= p_sys->vid_cap.audios )
 712     {
 713         msg_Dbg( p_demux, "invalid audio, falling back with no audio" );
 714         p_sys->i_audio = -1;
 715     }
 716
 717     if( p_sys->i_width < p_sys->vid_cap.minwidth ||
 718         p_sys->i_width > p_sys->vid_cap.maxwidth )
 719     {
 720         msg_Dbg( p_demux, "invalid width %i", p_sys->i_width );
 721         p_sys->i_width = 0;
 722     }
 723     if( p_sys->i_height < p_sys->vid_cap.minheight ||
 724         p_sys->i_height > p_sys->vid_cap.maxheight )
 725     {
 726         msg_Dbg( p_demux, "invalid height %i", p_sys->i_height );
 727         p_sys->i_height = 0;
 728     }
 729
 730     if( !( p_sys->vid_cap.type & VID_TYPE_CAPTURE ) )
 731     {
 732         msg_Err( p_demux, "cannot grab" );
 733         goto vdev_failed;
 734     }
 735
 736     vid_channel.channel = p_sys->i_channel;
 737     if( ioctl( i_fd, VIDIOCGCHAN, &vid_channel ) < 0 )
 738     {
 739         msg_Err( p_demux, "cannot get channel infos (%m)" );
 740         goto vdev_failed;
 741     }
 742     msg_Dbg( p_demux,
 743              "setting channel %s(%d) %d tuners flags=0x%x type=0x%x norm=0x%x",
 744              vid_channel.name, vid_channel.channel, vid_channel.tuners,
 745              vid_channel.flags, vid_channel.type, vid_channel.norm );
 746
 747     if( p_sys->i_tuner >= vid_channel.tuners )
 748     {
 749         msg_Dbg( p_demux, "invalid tuner, falling back on tuner 0" );
 750         p_sys->i_tuner = 0;
 751     }
 752
 753     vid_channel.norm = p_sys->i_norm;
 754     if( ioctl( i_fd, VIDIOCSCHAN, &vid_channel ) < 0 )
 755     {
 756         msg_Err( p_demux, "cannot set channel (%m)" );
 757         goto vdev_failed;
 758     }
 759
 760     if( vid_channel.flags & VIDEO_VC_TUNER )
 761     {
 762
 763         /* set tuner */
 764 #if 0
 765         struct video_tuner vid_tuner;
 766         if( p_sys->i_tuner >= 0 )
 767         {
 768             vid_tuner.tuner = p_sys->i_tuner;
 769             if( ioctl( i_fd, VIDIOCGTUNER, &vid_tuner ) < 0 )
 770             {
 771                 msg_Err( p_demux, "cannot get tuner (%m)" );
 772                 goto vdev_failed;
 773             }
 774             msg_Dbg( p_demux, "tuner %s low=%d high=%d, flags=0x%x "
 775                      "mode=0x%x signal=0x%x",
 776                      vid_tuner.name, vid_tuner.rangelow, vid_tuner.rangehigh,
 777                      vid_tuner.flags, vid_tuner.mode, vid_tuner.signal );
 778
 779             msg_Dbg( p_demux, "setting tuner %s (%d)",
 780                      vid_tuner.name, vid_tuner.tuner );
 781
 782             /* FIXME FIXME to be checked FIXME FIXME */
 783             //vid_tuner.mode = p_sys->i_norm;
 784             if( ioctl( i_fd, VIDIOCSTUNER, &vid_tuner ) < 0 )
 785             {
 786                 msg_Err( p_demux, "cannot set tuner (%m)" );
 787                 goto vdev_failed;
 788             }
 789         }
 790 #endif
 791
 792         /* Show a warning if frequency is < than 30000.
 793          * User is certainly usint old syntax. */
 794
 795
 796         /* set frequency */
 797         if( p_sys->i_frequency >= 0 )
 798         {
 799             int driver_frequency = p_sys->i_frequency * 16 /1000;
 800             if( ioctl( i_fd, VIDIOCSFREQ, &driver_frequency ) < 0 )
 801             {
 802                 msg_Err( p_demux, "cannot set frequency (%m)" );
 803                 goto vdev_failed;
 804             }
 805             msg_Dbg( p_demux, "frequency %d (%d)", p_sys->i_frequency,
 806                                                    driver_frequency );
 807         }
 808     }
 809
 810     /* set audio */
 811     if( vid_channel.flags & VIDEO_VC_AUDIO )
 812     {
 813         struct video_audio      vid_audio;
 814
 815         /* XXX TODO volume, balance, ... */
 816         if( p_sys->i_audio >= 0 )
 817         {
 818             vid_audio.audio = p_sys->i_audio;
 819             if( ioctl( i_fd, VIDIOCGAUDIO, &vid_audio ) < 0 )
 820             {
 821                 msg_Err( p_demux, "cannot get audio (%m)" );
 822                 goto vdev_failed;
 823             }
 824
 825             /* unmute audio */
 826             vid_audio.flags &= ~VIDEO_AUDIO_MUTE;
 827
 828             if( ioctl( i_fd, VIDIOCSAUDIO, &vid_audio ) < 0 )
 829             {
 830                 msg_Err( p_demux, "cannot set audio (%m)" );
 831                 goto vdev_failed;
 832             }
 833         }
 834
 835     }
 836
 837     /* establish basic params with input and norm before feeling width
 838      * or height */
 839     if( p_sys->b_mjpeg )
 840     {
 841         struct quicktime_mjpeg_app1 *p_app1;
 842         int32_t i_offset;
 843
 844         if( ioctl( i_fd, MJPIOC_G_PARAMS, &mjpeg ) < 0 )
 845         {
 846             msg_Err( p_demux, "cannot get mjpeg params (%m)" );
 847             goto vdev_failed;
 848         }
 849         mjpeg.input = p_sys->i_channel;
 850         mjpeg.norm  = p_sys->i_norm;
 851         mjpeg.decimation = p_sys->i_decimation;
 852
 853         if( p_sys->i_width )
 854             mjpeg.img_width = p_sys->i_width / p_sys->i_decimation;
 855         if( p_sys->i_height )
 856             mjpeg.img_height = p_sys->i_height / p_sys->i_decimation;
 857
 858         /* establish Quicktime APP1 marker while we are here */
 859         mjpeg.APPn = 1;
 860         mjpeg.APP_len = 40;
 861
 862         /* aligned */
 863         p_app1 = (struct quicktime_mjpeg_app1 *)mjpeg.APP_data;
 864         p_app1->i_reserved = 0;
 865         p_app1->i_tag = VLC_FOURCC( 'm','j','p','g' );
 866         p_app1->i_field_size = 0;
 867         p_app1->i_padded_field_size = 0;
 868         p_app1->i_next_field = 0;
 869         /* XXX WARNING XXX */
 870         /* these's nothing magic about these values.  We are dangerously
 871          * assuming the encoder card is encoding mjpeg-a and is not throwing
 872          * in marker tags we aren't expecting.  It's bad enough we have to
 873          * search through the jpeg output for every frame we grab just to
 874          * find the first field's end marker, so we take this risk to boost
 875          * performance.
 876          * This is really something the driver could do for us because this
 877          * does conform to standards outside of Apple Quicktime.
 878          */
 879         i_offset = 0x2e;
 880         p_app1->i_DQT_offset = hton32( i_offset );
 881         i_offset = 0xb4;
 882         p_app1->i_DHT_offset = hton32( i_offset );
 883         i_offset = 0x258;
 884         p_app1->i_SOF_offset = hton32( i_offset );
 885         i_offset = 0x26b;
 886         p_app1->i_SOS_offset = hton32( i_offset );
 887         i_offset = 0x279;
 888         p_app1->i_data_offset = hton32( i_offset );
 889
 890         /* SOF and SOS aren't specified by the mjpeg API because they aren't
 891          * optional.  They will be present in the output. */
 892         mjpeg.jpeg_markers = JPEG_MARKER_DHT | JPEG_MARKER_DQT;
 893
 894         if( ioctl( i_fd, MJPIOC_S_PARAMS, &mjpeg ) < 0 )
 895         {
 896             msg_Err( p_demux, "cannot set mjpeg params (%m)" );
 897             goto vdev_failed;
 898         }
 899
 900         p_sys->i_width = mjpeg.img_width * mjpeg.HorDcm;
 901         p_sys->i_height = mjpeg.img_height * mjpeg.VerDcm *
 902             mjpeg.field_per_buff;
 903     }
 904
 905     /* fix width/height */
 906     if( !p_sys->b_mjpeg && ( p_sys->i_width == 0 || p_sys->i_height == 0 ) )
 907     {
 908         struct video_window vid_win;
 909
 910         if( ioctl( i_fd, VIDIOCGWIN, &vid_win ) < 0 )
 911         {
 912             msg_Err( p_demux, "cannot get win (%m)" );
 913             goto vdev_failed;
 914         }
 915         p_sys->i_width  = vid_win.width;
 916         p_sys->i_height = vid_win.height;
 917
 918         if( !p_sys->i_width || !p_sys->i_height )
 919         {
 920             p_sys->i_width = p_sys->vid_cap.maxwidth;
 921             p_sys->i_height = p_sys->vid_cap.maxheight;
 922         }
 923
 924         if( !p_sys->i_width || !p_sys->i_height )
 925         {
 926             msg_Err( p_demux, "invalid video size (%ix%i)",
 927                      p_sys->i_width, p_sys->i_height );
 928             goto vdev_failed;
 929         }
 930
 931         msg_Dbg( p_demux, "will use %dx%d", p_sys->i_width, p_sys->i_height );
 932     }
 933
 934     if( !p_sys->b_mjpeg )
 935     {
 936         /* set hue/color/.. */
 937         if( ioctl( i_fd, VIDIOCGPICT, &p_sys->vid_picture ) == 0 )
 938         {
 939             struct video_picture vid_picture = p_sys->vid_picture;
 940
 941             if( p_sys->i_brightness >= 0 && p_sys->i_brightness < 65536 )
 942             {
 943                 vid_picture.brightness = p_sys->i_brightness;
 944             }
 945             if( p_sys->i_colour >= 0 && p_sys->i_colour < 65536 )
 946             {
 947                 vid_picture.colour = p_sys->i_colour;
 948             }
 949             if( p_sys->i_hue >= 0 && p_sys->i_hue < 65536 )
 950             {
 951                 vid_picture.hue = p_sys->i_hue;
 952             }
 953             if( p_sys->i_contrast  >= 0 && p_sys->i_contrast < 65536 )
 954             {
 955                 vid_picture.contrast = p_sys->i_contrast;
 956             }
 957             if( ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
 958             {
 959                 msg_Dbg( p_demux, "v4l device uses brightness: %d",
 960                          vid_picture.brightness );
 961                 msg_Dbg( p_demux, "v4l device uses colour: %d",
 962                          vid_picture.colour );
 963                 msg_Dbg( p_demux, "v4l device uses hue: %d", vid_picture.hue );
 964                 msg_Dbg( p_demux, "v4l device uses contrast: %d",
 965                          vid_picture.contrast );
 966                 p_sys->vid_picture = vid_picture;
 967             }
 968         }
 969
 970         /* Find out video format used by device */
 971         if( ioctl( i_fd, VIDIOCGPICT, &p_sys->vid_picture ) == 0 )
 972         {
 973             struct video_picture vid_picture = p_sys->vid_picture;
 974             char *psz;
 975             int i;
 976
 977             p_sys->i_fourcc = 0;
 978
 979             psz = var_CreateGetString( p_demux, "v4l-chroma" );
 980             if( strlen( psz ) >= 4 )
 981             {
 982                 vid_picture.palette = 0;
 983                 int i_chroma = VLC_FOURCC( psz[0], psz[1], psz[2], psz[3] );
 984
 985                 /* Find out v4l chroma code */
 986                 for( i = 0; v4lchroma_to_fourcc[i].i_v4l != 0; i++ )
 987                 {
 988                     if( v4lchroma_to_fourcc[i].i_fourcc == i_chroma )
 989                     {
 990                         vid_picture.palette = v4lchroma_to_fourcc[i].i_v4l;
 991                         break;
 992                     }
 993                 }
 994             }
 995             free( psz );
 996
 997             if( vid_picture.palette &&
 998                 !ioctl( i_fd, VIDIOCSPICT, &vid_picture ) )
 999             {
1000                 p_sys->vid_picture = vid_picture;
1001             }
1002             else
1003             {
1004                 /* Try to set the format to something easy to encode */
1005                 vid_picture.palette = VIDEO_PALETTE_YUV420P;
1006                 if( ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
1007                 {
1008                     p_sys->vid_picture = vid_picture;
1009                 }
1010                 else
1011                 {
1012                     vid_picture.palette = VIDEO_PALETTE_YUV422P;
1013                     if( ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
1014                     {
1015                         p_sys->vid_picture = vid_picture;
1016                     }
1017                 }
1018             }
1019
1020             /* Find out final format */
1021             for( i = 0; v4lchroma_to_fourcc[i].i_v4l != 0; i++ )
1022             {
1023                 if( v4lchroma_to_fourcc[i].i_v4l == p_sys->vid_picture.palette)
1024                 {
1025                     p_sys->i_fourcc = v4lchroma_to_fourcc[i].i_fourcc;
1026                     break;
1027                 }
1028             }
1029         }
1030         else
1031         {
1032             msg_Err( p_demux, "ioctl VIDIOCGPICT failed" );
1033             goto vdev_failed;
1034         }
1035     }
1036
1037     if( p_sys->b_mjpeg )
1038     {
1039         int i;
1040
1041         p_sys->mjpeg_buffers.count = 8;
1042         p_sys->mjpeg_buffers.size = MJPEG_BUFFER_SIZE;
1043
1044         if( ioctl( i_fd, MJPIOC_REQBUFS, &p_sys->mjpeg_buffers ) < 0 )
1045         {
1046             msg_Err( p_demux, "mmap unsupported" );
1047             goto vdev_failed;
1048         }
1049
1050         p_sys->p_video_mmap = mmap( 0,
1051                 p_sys->mjpeg_buffers.size * p_sys->mjpeg_buffers.count,
1052                 PROT_READ | PROT_WRITE, MAP_SHARED, i_fd, 0 );
1053         if( p_sys->p_video_mmap == MAP_FAILED )
1054         {
1055             msg_Err( p_demux, "mmap failed" );
1056             goto vdev_failed;
1057         }
1058
1059         p_sys->i_fourcc  = VLC_FOURCC( 'm','j','p','g' );
1060         p_sys->i_frame_pos = -1;
1061
1062         /* queue up all the frames */
1063         for( i = 0; i < (int)p_sys->mjpeg_buffers.count; i++ )
1064         {
1065             if( ioctl( i_fd, MJPIOC_QBUF_CAPT, &i ) < 0 )
1066             {
1067                 msg_Err( p_demux, "unable to queue frame" );
1068                 goto vdev_failed;
1069             }
1070         }
1071     }
1072     else
1073     {
1074         /* Fill in picture_t fields */
1075         vout_InitPicture( VLC_OBJECT(p_demux), &p_sys->pic, p_sys->i_fourcc,
1076                           p_sys->i_width, p_sys->i_height, p_sys->i_width *
1077                           VOUT_ASPECT_FACTOR / p_sys->i_height );
1078         if( !p_sys->pic.i_planes )
1079         {
1080             msg_Err( p_demux, "unsupported chroma" );
1081             goto vdev_failed;
1082         }
1083         p_sys->i_video_frame_size = 0;
1084         for( i = 0; i < p_sys->pic.i_planes; i++ )
1085         {
1086             p_sys->i_video_frame_size += p_sys->pic.p[i].i_visible_lines *
1087               p_sys->pic.p[i].i_visible_pitch;
1088         }
1089
1090         msg_Dbg( p_demux, "v4l device uses frame size: %i",
1091                  p_sys->i_video_frame_size );
1092         msg_Dbg( p_demux, "v4l device uses chroma: %4.4s",
1093                 (char*)&p_sys->i_fourcc );
1094
1095         /* Allocate mmap buffer */
1096         if( ioctl( i_fd, VIDIOCGMBUF, &p_sys->vid_mbuf ) < 0 )
1097         {
1098             msg_Err( p_demux, "mmap unsupported" );
1099             goto vdev_failed;
1100         }
1101
1102         p_sys->p_video_mmap = mmap( 0, p_sys->vid_mbuf.size,
1103                                     PROT_READ|PROT_WRITE, MAP_SHARED,
1104                                     i_fd, 0 );
1105         if( p_sys->p_video_mmap == MAP_FAILED )
1106         {
1107             /* FIXME -> normal read */
1108             msg_Err( p_demux, "mmap failed" );
1109             goto vdev_failed;
1110         }
1111
1112         /* init grabbing */
1113         p_sys->vid_mmap.frame  = 0;
1114         p_sys->vid_mmap.width  = p_sys->i_width;
1115         p_sys->vid_mmap.height = p_sys->i_height;
1116         p_sys->vid_mmap.format = p_sys->vid_picture.palette;
1117         if( ioctl( i_fd, VIDIOCMCAPTURE, &p_sys->vid_mmap ) < 0 )
1118         {
1119             msg_Warn( p_demux, "%4.4s refused", (char*)&p_sys->i_fourcc );
1120             msg_Err( p_demux, "chroma selection failed" );
1121             goto vdev_failed;
1122         }
1123     }
1124     return i_fd;
1125
1126 vdev_failed:
1127
1128     if( i_fd >= 0 ) close( i_fd );
1129     return -1;
1130 }
1131
1132 /*****************************************************************************
1133  * GrabVideo:
1134  *****************************************************************************/
1135 static uint8_t *GrabCapture( demux_t *p_demux )
1136 {
1137     demux_sys_t *p_sys = p_demux->p_sys;
1138     int i_captured_frame = p_sys->i_frame_pos;
1139
1140     p_sys->vid_mmap.frame = (p_sys->i_frame_pos + 1) % p_sys->vid_mbuf.frames;
1141
1142     while( ioctl( p_sys->i_fd, VIDIOCMCAPTURE, &p_sys->vid_mmap ) < 0 )
1143     {
1144         if( errno != EAGAIN )
1145         {
1146             msg_Err( p_demux, "failed capturing new frame" );
1147             return NULL;
1148         }
1149
1150         if( !vlc_object_alive (p_demux) )
1151         {
1152             return NULL;
1153         }
1154
1155         msg_Dbg( p_demux, "grab failed, trying again" );
1156     }
1157
1158     while( ioctl(p_sys->i_fd, VIDIOCSYNC, &p_sys->i_frame_pos) < 0 )
1159     {
1160         if( errno != EAGAIN && errno != EINTR )
1161         {
1162             msg_Err( p_demux, "failed syncing new frame" );
1163             return NULL;
1164         }
1165     }
1166
1167     p_sys->i_frame_pos = p_sys->vid_mmap.frame;
1168     /* leave i_video_frame_size alone */
1169     return p_sys->p_video_mmap + p_sys->vid_mbuf.offsets[i_captured_frame];
1170 }
1171
1172 static uint8_t *GrabMJPEG( demux_t *p_demux )
1173 {
1174     demux_sys_t *p_sys = p_demux->p_sys;
1175     struct mjpeg_sync sync;
1176     uint8_t *p_frame, *p_field, *p;
1177     uint16_t tag;
1178     uint32_t i_size;
1179     struct quicktime_mjpeg_app1 *p_app1 = NULL;
1180
1181     /* re-queue the last frame we sync'd */
1182     if( p_sys->i_frame_pos != -1 )
1183     {
1184         while( ioctl( p_sys->i_fd, MJPIOC_QBUF_CAPT,
1185                                        &p_sys->i_frame_pos ) < 0 )
1186         {
1187             if( errno != EAGAIN && errno != EINTR )
1188             {
1189                 msg_Err( p_demux, "failed capturing new frame" );
1190                 return NULL;
1191             }
1192         }
1193     }
1194
1195     /* sync on the next frame */
1196     while( ioctl( p_sys->i_fd, MJPIOC_SYNC, &sync ) < 0 )
1197     {
1198         if( errno != EAGAIN && errno != EINTR )
1199         {
1200             msg_Err( p_demux, "failed syncing new frame" );
1201             return NULL;
1202         }
1203     }
1204
1205     p_sys->i_frame_pos = sync.frame;
1206     p_frame = p_sys->p_video_mmap + p_sys->mjpeg_buffers.size * sync.frame;
1207
1208     /* p_frame now points to the data.  fix up the Quicktime APP1 marker */
1209     tag = 0xffd9;
1210     tag = hton16( tag );
1211     p_field = p_frame;
1212
1213     /* look for EOI */
1214     p = memmem( p_field, sync.length, &tag, 2 );
1215
1216     if( p )
1217     {
1218         p += 2; /* data immediately following EOI */
1219         /* UNALIGNED! */
1220         p_app1 = (struct quicktime_mjpeg_app1 *)(p_field + 6);
1221
1222         i_size = ((uint32_t)(p - p_field));
1223         i_size = hton32( i_size );
1224         memcpy( &p_app1->i_field_size, &i_size, 4 );
1225
1226         while( *p == 0xff && *(p+1) == 0xff )
1227             p++;
1228
1229         i_size = ((uint32_t)(p - p_field));
1230         i_size = hton32( i_size );
1231         memcpy( &p_app1->i_padded_field_size, &i_size, 4 );
1232     }
1233
1234     tag = 0xffd8;
1235     tag = hton16( tag );
1236     p_field = memmem( p, sync.length - (size_t)(p - p_frame), &tag, 2 );
1237
1238     if( p_field )
1239     {
1240         i_size = (uint32_t)(p_field - p_frame);
1241         i_size = hton32( i_size );
1242         memcpy( &p_app1->i_next_field, &i_size, 4 );
1243
1244         /* UNALIGNED! */
1245         p_app1 = (struct quicktime_mjpeg_app1 *)(p_field + 6);
1246         tag = 0xffd9;
1247         tag = hton16( tag );
1248         p = memmem( p_field, sync.length - (size_t)(p_field - p_frame),
1249                 &tag, 2 );
1250
1251         if( !p )
1252         {
1253             /* sometimes the second field doesn't have the EOI.  just put it
1254              * there
1255              */
1256             p = p_frame + sync.length;
1257             memcpy( p, &tag, 2 );
1258             sync.length += 2;
1259         }
1260
1261         p += 2;
1262         i_size = (uint32_t)(p - p_field);
1263         i_size = hton32( i_size );
1264         memcpy( &p_app1->i_field_size, &i_size, 4 );
1265         i_size = (uint32_t)(sync.length - (uint32_t)(p_field - p_frame));
1266         i_size = hton32( i_size );
1267         memcpy( &p_app1->i_padded_field_size, &i_size, 4 );
1268     }
1269
1270     p_sys->i_video_frame_size = sync.length;
1271     return p_frame;
1272 }
1273
1274 static block_t *GrabVideo( demux_t *p_demux )
1275 {
1276     demux_sys_t *p_sys = p_demux->p_sys;
1277     uint8_t     *p_frame;
1278     block_t     *p_block;
1279
1280     if( p_sys->f_fps >= 0.1 && p_sys->i_video_pts > 0 )
1281     {
1282         mtime_t i_dur = (mtime_t)((double)1000000 / (double)p_sys->f_fps);
1283
1284         /* Did we wait long enough ? (frame rate reduction) */
1285         if( p_sys->i_video_pts + i_dur > mdate() ) return 0;
1286     }
1287
1288     if( p_sys->b_mjpeg ) p_frame = GrabMJPEG( p_demux );
1289     else p_frame = GrabCapture( p_demux );
1290
1291     if( !p_frame ) return 0;
1292
1293     if( !( p_block = block_New( p_demux, p_sys->i_video_frame_size ) ) )
1294     {
1295         msg_Warn( p_demux, "cannot get block" );
1296         return 0;
1297     }
1298
1299     memcpy( p_block->p_buffer, p_frame, p_sys->i_video_frame_size );
1300     p_sys->i_video_pts = p_block->i_pts = p_block->i_dts = mdate();
1301
1302     return p_block;
1303 }