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
  43 #include <sys/ioctl.h>
  44 #include <sys/mman.h>
  45 #include <fcntl.h>
  46 #include <arpa/inet.h>
  47 #include <errno.h>
  48
  49 /* From GStreamer's v4l plugin:
  50  * Because of some really cool feature in video4linux1, also known as
  51  * 'not including sys/types.h and sys/time.h', we had to include it
  52  * ourselves. In all their intelligence, these people decided to fix
  53  * this in the next version (video4linux2) in such a cool way that it
  54  * breaks all compilations of old stuff...
  55  * The real problem is actually that linux/time.h doesn't use proper
  56  * macro checks before defining types like struct timeval. The proper
  57  * fix here is to either fuck the kernel header (which is what we do
  58  * by defining _LINUX_TIME_H, an innocent little hack) or by fixing it
  59  * upstream, which I'll consider doing later on. If you get compiler
  60  * errors here, check your linux/time.h && sys/time.h header setup.
  61 */
  62 #define _LINUX_TIME_H
  63
  64 #include <linux/videodev.h>
  65 #include "videodev_mjpeg.h"
  66
  67 #ifdef HAVE_LIBV4L1
  68 #include <libv4l1.h>
  69 #endif
  70 /*****************************************************************************
  71  * Module descriptior
  72  *****************************************************************************/
  73 static int  Open ( vlc_object_t * );
  74 static void Close( vlc_object_t * );
  75
  76 #define CACHING_TEXT N_("Caching value in ms")
  77 #define CACHING_LONGTEXT N_( \
  78     "Caching value for V4L captures. This " \
  79     "value should be set in milliseconds." )
  80 #define VDEV_TEXT N_("Video device name")
  81 #define VDEV_LONGTEXT N_( \
  82     "Name of the video device to use. " \
  83     "If you don't specify anything, no video device will be used.")
  84 #define CHROMA_TEXT N_("Video input chroma format")
  85 #define CHROMA_LONGTEXT N_( \
  86     "Force the Video4Linux video device to use a specific chroma format " \
  87     "(eg. I420 (default), RV24, etc.)")
  88 #define FREQUENCY_TEXT N_( "Frequency" )
  89 #define FREQUENCY_LONGTEXT N_( \
  90     "Frequency to capture (in kHz), if applicable." )
  91 #define CHANNEL_TEXT N_( "Channel" )
  92 #define CHANNEL_LONGTEXT N_( \
  93     "Channel of the card to use (Usually, 0 = tuner, " \
  94     "1 = composite, 2 = svideo)." )
  95 #define NORM_TEXT N_( "Norm" )
  96 #define NORM_LONGTEXT N_( \
  97     "Norm of the stream (Automatic, SECAM, PAL, or NTSC)." )
  98 #define AUDIO_TEXT N_( "Audio Channel" )
  99 #define AUDIO_LONGTEXT N_( \
 100     "Audio Channel to use, if there are several audio inputs." )
 101 #define WIDTH_TEXT N_( "Width" )
 102 #define WIDTH_LONGTEXT N_( "Width of the stream to capture " \
 103     "(-1 for autodetect)." )
 104 #define HEIGHT_TEXT N_( "Height" )
 105 #define HEIGHT_LONGTEXT N_( "Height of the stream to capture " \
 106     "(-1 for autodetect)." )
 107 #define BRIGHTNESS_TEXT N_( "Brightness" )
 108 #define BRIGHTNESS_LONGTEXT N_( \
 109     "Brightness of the video input." )
 110 #define HUE_TEXT N_( "Hue" )
 111 #define HUE_LONGTEXT N_( \
 112     "Hue of the video input." )
 113 #define COLOUR_TEXT N_( "Color" )
 114 #define COLOUR_LONGTEXT N_( \
 115     "Color of the video input." )
 116 #define CONTRAST_TEXT N_( "Contrast" )
 117 #define CONTRAST_LONGTEXT N_( \
 118     "Contrast of the video input." )
 119 #define TUNER_TEXT N_( "Tuner" )
 120 #define TUNER_LONGTEXT N_( "Tuner to use, if there are several ones." )
 121 #define MJPEG_TEXT N_( "MJPEG" )
 122 #define MJPEG_LONGTEXT N_(  \
 123     "Set this option if the capture device outputs MJPEG" )
 124 #define DECIMATION_TEXT N_( "Decimation" )
 125 #define DECIMATION_LONGTEXT N_( \
 126     "Decimation level for MJPEG streams" )
 127 #define QUALITY_TEXT N_( "Quality" )
 128 #define QUALITY_LONGTEXT N_( "Quality of the stream." )
 129 #define FPS_TEXT N_( "Framerate" )
 130 #define FPS_LONGTEXT N_( "Framerate to capture, if applicable " \
 131     "(-1 for autodetect)." )
 132
 133 #define AUDIO_DEPRECATED_ERROR N_( \
 134     "Alsa or OSS audio capture in the v4l access is deprecated. " \
 135     "please use 'v4l:/""/ :input-slave=alsa:/""/' or " \
 136     "'v4l:/""/ :input-slave=oss:/""/' instead." )
 137
 138 static const int i_norm_list[] =
 139     { VIDEO_MODE_AUTO, VIDEO_MODE_SECAM, VIDEO_MODE_PAL, VIDEO_MODE_NTSC };
 140 static const char *const psz_norm_list_text[] =
 141     { N_("Automatic"), N_("SECAM"), N_("PAL"),  N_("NTSC") };
 142
 143 #define V4L_DEFAULT "/dev/video"
 144
 145 vlc_module_begin ()
 146     set_shortname( N_("Video4Linux") )
 147     set_description( N_("Video4Linux input") )
 148     set_category( CAT_INPUT )
 149     set_subcategory( SUBCAT_INPUT_ACCESS )
 150
 151     add_integer( "v4l-caching", DEFAULT_PTS_DELAY / 1000, NULL,
 152                  CACHING_TEXT, CACHING_LONGTEXT, true )
 153     add_obsolete_string( "v4l-vdev" );
 154     add_obsolete_string( "v4l-adev" );
 155     add_string( "v4l-chroma", NULL, NULL, CHROMA_TEXT, CHROMA_LONGTEXT,
 156                 true )
 157     add_float( "v4l-fps", -1.0, NULL, FPS_TEXT, FPS_LONGTEXT, true )
 158     add_obsolete_integer( "v4l-samplerate" );
 159     add_integer( "v4l-channel", 0, NULL, CHANNEL_TEXT, CHANNEL_LONGTEXT,
 160                 true )
 161     add_integer( "v4l-tuner", -1, NULL, TUNER_TEXT, TUNER_LONGTEXT, true )
 162     add_integer( "v4l-norm", VIDEO_MODE_AUTO, NULL, NORM_TEXT, NORM_LONGTEXT,
 163                 false )
 164         change_integer_list( i_norm_list, psz_norm_list_text, NULL );
 165     add_integer( "v4l-frequency", -1, NULL, FREQUENCY_TEXT, FREQUENCY_LONGTEXT,
 166                 false )
 167     add_integer( "v4l-audio", -1, NULL, AUDIO_TEXT, AUDIO_LONGTEXT, true )
 168     add_obsolete_bool( "v4l-stereo" );
 169     add_integer( "v4l-width", 0, NULL, WIDTH_TEXT, WIDTH_LONGTEXT, true )
 170     add_integer( "v4l-height", 0, NULL, HEIGHT_TEXT, HEIGHT_LONGTEXT,
 171                 true )
 172     add_integer( "v4l-brightness", -1, NULL, BRIGHTNESS_TEXT,
 173                 BRIGHTNESS_LONGTEXT, true )
 174     add_integer( "v4l-colour", -1, NULL, COLOUR_TEXT, COLOUR_LONGTEXT,
 175                 true )
 176     add_integer( "v4l-hue", -1, NULL, HUE_TEXT, HUE_LONGTEXT, true )
 177     add_integer( "v4l-contrast", -1, NULL, CONTRAST_TEXT, CONTRAST_LONGTEXT,
 178                 true )
 179     add_bool( "v4l-mjpeg", false, NULL, MJPEG_TEXT, MJPEG_LONGTEXT,
 180             true )
 181     add_integer( "v4l-decimation", 1, NULL, DECIMATION_TEXT,
 182             DECIMATION_LONGTEXT, true )
 183     add_integer( "v4l-quality", 100, NULL, QUALITY_TEXT, QUALITY_LONGTEXT,
 184             true )
 185
 186     add_shortcut( "v4l" )
 187     set_capability( "access_demux", 10 )
 188     set_callbacks( Open, Close )
 189 vlc_module_end ()
 190
 191 /*****************************************************************************
 192  * Access: local prototypes
 193  *****************************************************************************/
 194 static int Demux  ( demux_t * );
 195 static int Control( demux_t *, int, va_list );
 196
 197 static void ParseMRL    ( demux_t * );
 198 static int  OpenVideoDev( demux_t *, char * );
 199 static block_t *GrabVideo( demux_t * );
 200
 201 #define MJPEG_BUFFER_SIZE (256*1024)
 202
 203 struct quicktime_mjpeg_app1
 204 {
 205     uint32_t    i_reserved;             /* set to 0 */
 206     uint32_t    i_tag;                  /* 'mjpg' */
 207     uint32_t    i_field_size;           /* offset following EOI */
 208     uint32_t    i_padded_field_size;    /* offset following EOI+pad */
 209     uint32_t    i_next_field;           /* offset to next field */
 210     uint32_t    i_DQT_offset;
 211     uint32_t    i_DHT_offset;
 212     uint32_t    i_SOF_offset;
 213     uint32_t    i_SOS_offset;
 214     uint32_t    i_data_offset;          /* following SOS marker data */
 215 };
 216
 217 static const struct
 218 {
 219     int i_v4l;
 220     vlc_fourcc_t i_fourcc;
 221
 222 } v4lchroma_to_fourcc[] =
 223 {
 224     { VIDEO_PALETTE_GREY, VLC_CODEC_GREY },
 225     { VIDEO_PALETTE_HI240, VLC_FOURCC( 'I', '2', '4', '0' ) },
 226     { VIDEO_PALETTE_RGB565, VLC_CODEC_RGB16 },
 227     { VIDEO_PALETTE_RGB555, VLC_CODEC_RGB15 },
 228     { VIDEO_PALETTE_RGB24, VLC_CODEC_RGB24 },
 229     { VIDEO_PALETTE_RGB32, VLC_CODEC_RGB32 },
 230     { VIDEO_PALETTE_YUV422, VLC_CODEC_YUYV },
 231     { VIDEO_PALETTE_YUYV, VLC_CODEC_YUYV },
 232     { VIDEO_PALETTE_UYVY, VLC_CODEC_UYVY },
 233     { VIDEO_PALETTE_YUV420, VLC_FOURCC( 'I', '4', '2', 'N' ) },
 234     { VIDEO_PALETTE_YUV411, VLC_FOURCC( 'I', '4', '1', 'N' ) },
 235     { VIDEO_PALETTE_RAW, VLC_FOURCC( 'G', 'R', 'A', 'W' ) },
 236     { VIDEO_PALETTE_YUV422P, VLC_CODEC_I422 },
 237     { VIDEO_PALETTE_YUV420P, VLC_CODEC_I420 },
 238     { VIDEO_PALETTE_YUV411P, VLC_CODEC_I411 },
 239     { 0, 0 }
 240 };
 241
 242 struct demux_sys_t
 243 {
 244     /* Devices */
 245     char *psz_device;         /* Main device from MRL */
 246     int  i_fd;
 247
 248     /* Video properties */
 249     picture_t pic;
 250
 251     int i_fourcc;
 252     int i_channel;
 253     int i_audio;
 254     int i_norm;
 255     int i_tuner;
 256     int i_frequency;
 257     int i_width;
 258     int i_height;
 259
 260     int i_brightness;
 261     int i_hue;
 262     int i_colour;
 263     int i_contrast;
 264
 265     float f_fps;            /* <= 0.0 mean to grab at full rate */
 266     mtime_t i_video_pts;    /* only used when f_fps > 0 */
 267
 268     bool b_mjpeg;
 269     int i_decimation;
 270     int i_quality;
 271
 272     struct video_capability vid_cap;
 273     struct video_mbuf       vid_mbuf;
 274     struct mjpeg_requestbuffers mjpeg_buffers;
 275
 276     uint8_t *p_video_mmap;
 277     int     i_frame_pos;
 278
 279     struct video_mmap   vid_mmap;
 280     struct video_picture vid_picture;
 281
 282     int          i_video_frame_size;
 283     es_out_id_t  *p_es;
 284 };
 285
 286 #ifndef HAVE_LIBV4L1
 287 #   define v4l1_close close
 288 #   define v4l1_ioctl ioctl
 289 #   define v4l1_mmap mmap
 290 #   define v4l1_munmap munmap
 291 #   define v4l1_open utf8_open
 292 #endif
 293
 294 /*****************************************************************************
 295  * Open: opens v4l device
 296  *****************************************************************************
 297  *
 298  * url: <video device>::::
 299  *
 300  *****************************************************************************/
 301 static int Open( vlc_object_t *p_this )
 302 {
 303     demux_t     *p_demux = (demux_t*)p_this;
 304     demux_sys_t *p_sys;
 305
 306     /* Only when selected */
 307     if( *p_demux->psz_access == '\0' )
 308         return VLC_EGENERIC;
 309
 310     /* Set up p_demux */
 311     p_demux->pf_demux = Demux;
 312     p_demux->pf_control = Control;
 313     p_demux->info.i_update = 0;
 314     p_demux->info.i_title = 0;
 315     p_demux->info.i_seekpoint = 0;
 316     p_demux->p_sys = p_sys = calloc( 1, sizeof( demux_sys_t ) );
 317     if( !p_sys )
 318         return VLC_ENOMEM;
 319
 320     p_sys->i_audio      = var_CreateGetInteger( p_demux, "v4l-audio" );
 321     p_sys->i_channel    = var_CreateGetInteger( p_demux, "v4l-channel" );
 322     p_sys->i_norm       = var_CreateGetInteger( p_demux, "v4l-norm" );
 323     p_sys->i_tuner      = var_CreateGetInteger( p_demux, "v4l-tuner" );
 324     p_sys->i_frequency  = var_CreateGetInteger( p_demux, "v4l-frequency" );
 325
 326     p_sys->f_fps        = var_CreateGetFloat( p_demux, "v4l-fps" );
 327     p_sys->i_width      = var_CreateGetInteger( p_demux, "v4l-width" );
 328     p_sys->i_height     = var_CreateGetInteger( p_demux, "v4l-height" );
 329     p_sys->i_video_pts  = -1;
 330     p_sys->i_brightness = var_CreateGetInteger( p_demux, "v4l-brightness" );
 331
 332     p_sys->i_hue        = var_CreateGetInteger( p_demux, "v4l-hue" );
 333     p_sys->i_colour     = var_CreateGetInteger( p_demux, "v4l-colour" );
 334     p_sys->i_contrast   = var_CreateGetInteger( p_demux, "v4l-contrast" );
 335
 336     p_sys->b_mjpeg      = var_CreateGetBool( p_demux, "v4l-mjpeg" );
 337     p_sys->i_decimation = var_CreateGetInteger( p_demux, "v4l-decimation" );
 338     p_sys->i_quality    = var_CreateGetInteger( p_demux, "v4l-quality" );
 339
 340     p_sys->psz_device = NULL;
 341     p_sys->i_fd = -1;
 342
 343     p_sys->p_es = NULL;
 344
 345     ParseMRL( p_demux );
 346
 347     msg_Dbg( p_this, "opening device '%s'", p_sys->psz_device );
 348     p_sys->i_fd = OpenVideoDev( p_demux, p_sys->psz_device );
 349     if( p_sys->i_fd < 0 )
 350     {
 351         Close( p_this );
 352         return VLC_EGENERIC;
 353     }
 354
 355
 356     msg_Dbg( p_demux, "v4l grabbing started" );
 357
 358     /* Declare elementary streams */
 359     es_format_t fmt;
 360     es_format_Init( &fmt, VIDEO_ES, p_sys->i_fourcc );
 361     fmt.video.i_width  = p_sys->i_width;
 362     fmt.video.i_height = p_sys->i_height;
 363     fmt.video.i_aspect = 4 * VOUT_ASPECT_FACTOR / 3;
 364
 365     /* Setup rgb mask for RGB formats */
 366     switch( p_sys->i_fourcc )
 367     {
 368         case VLC_CODEC_RGB15:
 369             fmt.video.i_rmask = 0x001f;
 370             fmt.video.i_gmask = 0x03e0;
 371             fmt.video.i_bmask = 0x7c00;
 372             break;
 373         case VLC_CODEC_RGB16:
 374             fmt.video.i_rmask = 0x001f;
 375             fmt.video.i_gmask = 0x07e0;
 376             fmt.video.i_bmask = 0xf800;
 377             break;
 378         case VLC_CODEC_RGB24:
 379         case VLC_CODEC_RGB32:
 380             fmt.video.i_rmask = 0x00ff0000;
 381             fmt.video.i_gmask = 0x0000ff00;
 382             fmt.video.i_bmask = 0x000000ff;
 383             break;
 384     }
 385
 386     msg_Dbg( p_demux, "added new video es %4.4s %dx%d",
 387              (char*)&fmt.i_codec, fmt.video.i_width, fmt.video.i_height );
 388     p_sys->p_es = es_out_Add( p_demux->out, &fmt );
 389
 390     /* Update default_pts to a suitable value for access */
 391     var_Create( p_demux, "v4l-caching", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 392
 393     return VLC_SUCCESS;
 394 }
 395
 396 /*****************************************************************************
 397  * Close: close device, free resources
 398  *****************************************************************************/
 399 static void Close( vlc_object_t *p_this )
 400 {
 401     demux_t     *p_demux = (demux_t *)p_this;
 402     demux_sys_t *p_sys   = p_demux->p_sys;
 403
 404     free( p_sys->psz_device );
 405     if( p_sys->i_fd >= 0 ) v4l1_close( p_sys->i_fd );
 406
 407     if( p_sys->b_mjpeg )
 408     {
 409         int i_noframe = -1;
 410         v4l1_ioctl( p_sys->i_fd, MJPIOC_QBUF_CAPT, &i_noframe );
 411     }
 412
 413     if( p_sys->p_video_mmap && p_sys->p_video_mmap != MAP_FAILED )
 414     {
 415         if( p_sys->b_mjpeg )
 416             v4l1_munmap( p_sys->p_video_mmap, p_sys->mjpeg_buffers.size *
 417                     p_sys->mjpeg_buffers.count );
 418         else
 419             v4l1_munmap( p_sys->p_video_mmap, p_sys->vid_mbuf.size );
 420     }
 421
 422     free( p_sys );
 423 }
 424
 425 /*****************************************************************************
 426  * Control:
 427  *****************************************************************************/
 428 static int Control( demux_t *p_demux, int i_query, va_list args )
 429 {
 430     bool *pb;
 431     int64_t    *pi64;
 432
 433     switch( i_query )
 434     {
 435         /* Special for access_demux */
 436         case DEMUX_CAN_PAUSE:
 437         case DEMUX_CAN_SEEK:
 438         case DEMUX_CAN_CONTROL_PACE:
 439             pb = (bool*)va_arg( args, bool * );
 440             *pb = false;
 441             return VLC_SUCCESS;
 442
 443         case DEMUX_GET_PTS_DELAY:
 444             pi64 = (int64_t*)va_arg( args, int64_t * );
 445             *pi64 = (int64_t)var_GetInteger( p_demux, "v4l-caching" ) * 1000;
 446             return VLC_SUCCESS;
 447
 448         case DEMUX_GET_TIME:
 449             pi64 = (int64_t*)va_arg( args, int64_t * );
 450             *pi64 = mdate();
 451             return VLC_SUCCESS;
 452
 453         /* TODO implement others */
 454         default:
 455             return VLC_EGENERIC;
 456     }
 457
 458     return VLC_EGENERIC;
 459 }
 460
 461 /*****************************************************************************
 462  * Demux:
 463  *****************************************************************************/
 464 static int Demux( demux_t *p_demux )
 465 {
 466     demux_sys_t *p_sys = p_demux->p_sys;
 467
 468     block_t *p_block = GrabVideo( p_demux );
 469
 470     if( !p_block )
 471     {
 472         msleep( 10000 ); /* Unfortunately v4l doesn't allow polling */
 473         return 1;
 474     }
 475
 476     es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
 477     es_out_Send( p_demux->out, p_sys->p_es, p_block );
 478
 479     return 1;
 480 }
 481
 482 /*****************************************************************************
 483  * ParseMRL: parse the options contained in the MRL
 484  *****************************************************************************/
 485 static void ParseMRL( demux_t *p_demux )
 486 {
 487     demux_sys_t *p_sys = p_demux->p_sys;
 488
 489     char *psz_dup = strdup( p_demux->psz_path );
 490     char *psz_parser = psz_dup;
 491
 492     while( *psz_parser && *psz_parser != ':' )
 493     {
 494         psz_parser++;
 495     }
 496
 497     if( *psz_parser == ':' )
 498     {
 499         /* read options */
 500         for( ;; )
 501         {
 502             *psz_parser++ = '\0';
 503             if( !strncmp( psz_parser, "channel=", strlen( "channel=" ) ) )
 504             {
 505                 p_sys->i_channel = strtol( psz_parser + strlen( "channel=" ),
 506                                            &psz_parser, 0 );
 507             }
 508             else if( !strncmp( psz_parser, "norm=", strlen( "norm=" ) ) )
 509             {
 510                 psz_parser += strlen( "norm=" );
 511                 if( !strncmp( psz_parser, "pal", strlen( "pal" ) ) )
 512                 {
 513                     p_sys->i_norm = VIDEO_MODE_PAL;
 514                     psz_parser += strlen( "pal" );
 515                 }
 516                 else if( !strncmp( psz_parser, "ntsc", strlen( "ntsc" ) ) )
 517                 {
 518                     p_sys->i_norm = VIDEO_MODE_NTSC;
 519                     psz_parser += strlen( "ntsc" );
 520                 }
 521                 else if( !strncmp( psz_parser, "secam", strlen( "secam" ) ) )
 522                 {
 523                     p_sys->i_norm = VIDEO_MODE_SECAM;
 524                     psz_parser += strlen( "secam" );
 525                 }
 526                 else if( !strncmp( psz_parser, "auto", strlen( "auto" ) ) )
 527                 {
 528                     p_sys->i_norm = VIDEO_MODE_AUTO;
 529                     psz_parser += strlen( "auto" );
 530                 }
 531                 else
 532                 {
 533                     p_sys->i_norm = strtol( psz_parser, &psz_parser, 0 );
 534                 }
 535             }
 536             else if( !strncmp( psz_parser, "frequency=",
 537                                strlen( "frequency=" ) ) )
 538             {
 539                 p_sys->i_frequency =
 540                     strtol( psz_parser + strlen( "frequency=" ),
 541                             &psz_parser, 0 );
 542                 if( p_sys->i_frequency < 30000 )
 543                 {
 544                     msg_Warn( p_demux, "v4l syntax has changed : "
 545                               "'frequency' is now channel frequency in kHz");
 546                 }
 547             }
 548             else if( !strncmp( psz_parser, "audio=", strlen( "audio=" ) ) )
 549             {
 550                 p_sys->i_audio = strtol( psz_parser + strlen( "audio=" ),
 551                                          &psz_parser, 0 );
 552             }
 553             else if( !strncmp( psz_parser, "size=", strlen( "size=" ) ) )
 554             {
 555                 psz_parser += strlen( "size=" );
 556                 if( !strncmp( psz_parser, "subqcif", strlen( "subqcif" ) ) )
 557                 {
 558                     p_sys->i_width  = 128;
 559                     p_sys->i_height = 96;
 560                 }
 561                 else if( !strncmp( psz_parser, "qsif", strlen( "qsif" ) ) )
 562                 {
 563                     p_sys->i_width  = 160;
 564                     p_sys->i_height = 120;
 565                 }
 566                 else if( !strncmp( psz_parser, "qcif", strlen( "qcif" ) ) )
 567                 {
 568                     p_sys->i_width  = 176;
 569                     p_sys->i_height = 144;
 570                 }
 571                 else if( !strncmp( psz_parser, "sif", strlen( "sif" ) ) )
 572                 {
 573                     p_sys->i_width  = 320;
 574                     p_sys->i_height = 244;
 575                 }
 576                 else if( !strncmp( psz_parser, "cif", strlen( "cif" ) ) )
 577                 {
 578                     p_sys->i_width  = 352;
 579                     p_sys->i_height = 288;
 580                 }
 581                 else if( !strncmp( psz_parser, "vga", strlen( "vga" ) ) )
 582                 {
 583                     p_sys->i_width  = 640;
 584                     p_sys->i_height = 480;
 585                 }
 586                 else
 587                 {
 588                     /* widthxheight */
 589                     p_sys->i_width = strtol( psz_parser, &psz_parser, 0 );
 590                     if( *psz_parser == 'x' || *psz_parser == 'X')
 591                     {
 592                         p_sys->i_height = strtol( psz_parser + 1,
 593                                                   &psz_parser, 0 );
 594                     }
 595                     msg_Dbg( p_demux, "WxH %dx%d", p_sys->i_width,
 596                              p_sys->i_height );
 597                 }
 598             }
 599             else if( !strncmp( psz_parser, "brightness=", strlen( "brightness=" ) ) )
 600             {
 601                 p_sys->i_brightness = strtol( psz_parser + strlen( "brightness=" ),
 602                                               &psz_parser, 0 );
 603             }
 604             else if( !strncmp( psz_parser, "colour=", strlen( "colour=" ) ) )
 605             {
 606                 p_sys->i_colour = strtol( psz_parser + strlen( "colour=" ),
 607                                           &psz_parser, 0 );
 608             }
 609             else if( !strncmp( psz_parser, "hue=", strlen( "hue=" ) ) )
 610             {
 611                 p_sys->i_hue = strtol( psz_parser + strlen( "hue=" ),
 612                                        &psz_parser, 0 );
 613             }
 614             else if( !strncmp( psz_parser, "contrast=", strlen( "contrast=" ) ) )
 615             {
 616                 p_sys->i_contrast = strtol( psz_parser + strlen( "contrast=" ),
 617                                             &psz_parser, 0 );
 618             }
 619             else if( !strncmp( psz_parser, "tuner=", strlen( "tuner=" ) ) )
 620             {
 621                 p_sys->i_tuner = strtol( psz_parser + strlen( "tuner=" ),
 622                                          &psz_parser, 0 );
 623             }
 624             else if( !strncmp( psz_parser, "mjpeg", strlen( "mjpeg" ) ) )
 625             {
 626                 psz_parser += strlen( "mjpeg" );
 627
 628                 p_sys->b_mjpeg = true;
 629             }
 630             else if( !strncmp( psz_parser, "decimation=",
 631                         strlen( "decimation=" ) ) )
 632             {
 633                 p_sys->i_decimation =
 634                     strtol( psz_parser + strlen( "decimation=" ),
 635                             &psz_parser, 0 );
 636             }
 637             else if( !strncmp( psz_parser, "quality=",
 638                         strlen( "quality=" ) ) )
 639             {
 640                 p_sys->i_quality =
 641                     strtol( psz_parser + strlen( "quality=" ),
 642                             &psz_parser, 0 );
 643             }
 644             else if( !strncmp( psz_parser, "fps=", strlen( "fps=" ) ) )
 645             {
 646                 p_sys->f_fps = us_strtof( psz_parser + strlen( "fps=" ),
 647                                           &psz_parser );
 648             }
 649             else if( !strncmp( psz_parser, "adev=", strlen( "adev=" ) )
 650              || !strncmp( psz_parser, "samplerate=", strlen( "samplerate=" ) )
 651              || !strncmp( psz_parser, "stereo", strlen( "stereo" ) )
 652              || !strncmp( psz_parser, "mono", strlen( "mono" ) ) )
 653             {
 654                 if( strchr( psz_parser, ':' ) )
 655                     psz_parser = strchr( psz_parser, ':' );
 656                 else
 657                     psz_parser += strlen( psz_parser );
 658                 msg_Err( p_demux, AUDIO_DEPRECATED_ERROR );
 659             }
 660             else
 661             {
 662                 msg_Warn( p_demux, "unknown option" );
 663             }
 664
 665             while( *psz_parser && *psz_parser != ':' )
 666             {
 667                 psz_parser++;
 668             }
 669
 670             if( *psz_parser == '\0' )
 671             {
 672                 break;
 673             }
 674         }
 675     }
 676
 677     if( *psz_dup )
 678         p_sys->psz_device = strdup( psz_dup );
 679     else
 680         p_sys->psz_device = strdup( V4L_DEFAULT );
 681     free( psz_dup );
 682 }
 683
 684 /*****************************************************************************
 685  * OpenVideoDev:
 686  *****************************************************************************/
 687 static int OpenVideoDev( demux_t *p_demux, char *psz_device )
 688 {
 689     demux_sys_t *p_sys = p_demux->p_sys;
 690     int i_fd;
 691
 692     struct video_channel vid_channel;
 693     struct mjpeg_params mjpeg;
 694     int i;
 695
 696     if( ( i_fd = v4l1_open( psz_device, O_RDWR ) ) < 0 )
 697     {
 698         msg_Err( p_demux, "cannot open device (%m)" );
 699         goto vdev_failed;
 700     }
 701
 702     if( v4l1_ioctl( i_fd, VIDIOCGCAP, &p_sys->vid_cap ) < 0 )
 703     {
 704         msg_Err( p_demux, "cannot get capabilities (%m)" );
 705         goto vdev_failed;
 706     }
 707
 708     msg_Dbg( p_demux,
 709              "V4L device %s %d channels %d audios %d < w < %d %d < h < %d",
 710              p_sys->vid_cap.name,
 711              p_sys->vid_cap.channels,
 712              p_sys->vid_cap.audios,
 713              p_sys->vid_cap.minwidth,  p_sys->vid_cap.maxwidth,
 714              p_sys->vid_cap.minheight, p_sys->vid_cap.maxheight );
 715
 716     if( p_sys->i_channel < 0 || p_sys->i_channel >= p_sys->vid_cap.channels )
 717     {
 718         msg_Dbg( p_demux, "invalid channel, falling back on channel 0" );
 719         p_sys->i_channel = 0;
 720     }
 721     if( p_sys->vid_cap.audios && p_sys->i_audio >= p_sys->vid_cap.audios )
 722     {
 723         msg_Dbg( p_demux, "invalid audio, falling back with no audio" );
 724         p_sys->i_audio = -1;
 725     }
 726
 727     if( p_sys->i_width < p_sys->vid_cap.minwidth ||
 728         p_sys->i_width > p_sys->vid_cap.maxwidth )
 729     {
 730         msg_Dbg( p_demux, "invalid width %i", p_sys->i_width );
 731         p_sys->i_width = 0;
 732     }
 733     if( p_sys->i_height < p_sys->vid_cap.minheight ||
 734         p_sys->i_height > p_sys->vid_cap.maxheight )
 735     {
 736         msg_Dbg( p_demux, "invalid height %i", p_sys->i_height );
 737         p_sys->i_height = 0;
 738     }
 739
 740     if( !( p_sys->vid_cap.type & VID_TYPE_CAPTURE ) )
 741     {
 742         msg_Err( p_demux, "cannot grab" );
 743         goto vdev_failed;
 744     }
 745
 746     vid_channel.channel = p_sys->i_channel;
 747     if( v4l1_ioctl( i_fd, VIDIOCGCHAN, &vid_channel ) < 0 )
 748     {
 749         msg_Err( p_demux, "cannot get channel infos (%m)" );
 750         goto vdev_failed;
 751     }
 752     msg_Dbg( p_demux,
 753              "setting channel %s(%d) %d tuners flags=0x%x type=0x%x norm=0x%x",
 754              vid_channel.name, vid_channel.channel, vid_channel.tuners,
 755              vid_channel.flags, vid_channel.type, vid_channel.norm );
 756
 757     if( p_sys->i_tuner >= vid_channel.tuners )
 758     {
 759         msg_Dbg( p_demux, "invalid tuner, falling back on tuner 0" );
 760         p_sys->i_tuner = 0;
 761     }
 762
 763     vid_channel.norm = p_sys->i_norm;
 764     if( v4l1_ioctl( i_fd, VIDIOCSCHAN, &vid_channel ) < 0 )
 765     {
 766         msg_Err( p_demux, "cannot set channel (%m)" );
 767         goto vdev_failed;
 768     }
 769
 770     if( vid_channel.flags & VIDEO_VC_TUNER )
 771     {
 772
 773         /* set tuner */
 774 #if 0
 775         struct video_tuner vid_tuner;
 776         if( p_sys->i_tuner >= 0 )
 777         {
 778             vid_tuner.tuner = p_sys->i_tuner;
 779             if( v4l1_ioctl( i_fd, VIDIOCGTUNER, &vid_tuner ) < 0 )
 780             {
 781                 msg_Err( p_demux, "cannot get tuner (%m)" );
 782                 goto vdev_failed;
 783             }
 784             msg_Dbg( p_demux, "tuner %s low=%d high=%d, flags=0x%x "
 785                      "mode=0x%x signal=0x%x",
 786                      vid_tuner.name, vid_tuner.rangelow, vid_tuner.rangehigh,
 787                      vid_tuner.flags, vid_tuner.mode, vid_tuner.signal );
 788
 789             msg_Dbg( p_demux, "setting tuner %s (%d)",
 790                      vid_tuner.name, vid_tuner.tuner );
 791
 792             /* FIXME FIXME to be checked FIXME FIXME */
 793             //vid_tuner.mode = p_sys->i_norm;
 794             if( v4l1_ioctl( i_fd, VIDIOCSTUNER, &vid_tuner ) < 0 )
 795             {
 796                 msg_Err( p_demux, "cannot set tuner (%m)" );
 797                 goto vdev_failed;
 798             }
 799         }
 800 #endif
 801
 802         /* Show a warning if frequency is < than 30000.
 803          * User is certainly usint old syntax. */
 804
 805
 806         /* set frequency */
 807         if( p_sys->i_frequency >= 0 )
 808         {
 809             int driver_frequency = p_sys->i_frequency * 16 /1000;
 810             if( v4l1_ioctl( i_fd, VIDIOCSFREQ, &driver_frequency ) < 0 )
 811             {
 812                 msg_Err( p_demux, "cannot set frequency (%m)" );
 813                 goto vdev_failed;
 814             }
 815             msg_Dbg( p_demux, "frequency %d (%d)", p_sys->i_frequency,
 816                                                    driver_frequency );
 817         }
 818     }
 819
 820     /* set audio */
 821     if( vid_channel.flags & VIDEO_VC_AUDIO )
 822     {
 823         struct video_audio      vid_audio;
 824
 825         /* XXX TODO volume, balance, ... */
 826         if( p_sys->i_audio >= 0 )
 827         {
 828             vid_audio.audio = p_sys->i_audio;
 829             if( v4l1_ioctl( i_fd, VIDIOCGAUDIO, &vid_audio ) < 0 )
 830             {
 831                 msg_Err( p_demux, "cannot get audio (%m)" );
 832                 goto vdev_failed;
 833             }
 834
 835             /* unmute audio */
 836             vid_audio.flags &= ~VIDEO_AUDIO_MUTE;
 837
 838             if( v4l1_ioctl( i_fd, VIDIOCSAUDIO, &vid_audio ) < 0 )
 839             {
 840                 msg_Err( p_demux, "cannot set audio (%m)" );
 841                 goto vdev_failed;
 842             }
 843         }
 844
 845     }
 846
 847     /* establish basic params with input and norm before feeling width
 848      * or height */
 849     if( p_sys->b_mjpeg )
 850     {
 851         struct quicktime_mjpeg_app1 p_app1;
 852         int32_t i_offset;
 853
 854         if( v4l1_ioctl( i_fd, MJPIOC_G_PARAMS, &mjpeg ) < 0 )
 855         {
 856             msg_Err( p_demux, "cannot get mjpeg params (%m)" );
 857             goto vdev_failed;
 858         }
 859         mjpeg.input = p_sys->i_channel;
 860         mjpeg.norm  = p_sys->i_norm;
 861         mjpeg.decimation = p_sys->i_decimation;
 862
 863         if( p_sys->i_width )
 864             mjpeg.img_width = p_sys->i_width / p_sys->i_decimation;
 865         if( p_sys->i_height )
 866             mjpeg.img_height = p_sys->i_height / p_sys->i_decimation;
 867
 868         /* establish Quicktime APP1 marker while we are here */
 869         mjpeg.APPn = 1;
 870         mjpeg.APP_len = 40;
 871
 872         /* aligned */
 873         p_app1.i_reserved = 0;
 874         p_app1.i_tag = VLC_FOURCC( 'm','j','p','g' );
 875         p_app1.i_field_size = 0;
 876         p_app1.i_padded_field_size = 0;
 877         p_app1.i_next_field = 0;
 878         /* XXX WARNING XXX */
 879         /* these's nothing magic about these values.  We are dangerously
 880          * assuming the encoder card is encoding mjpeg-a and is not throwing
 881          * in marker tags we aren't expecting.  It's bad enough we have to
 882          * search through the jpeg output for every frame we grab just to
 883          * find the first field's end marker, so we take this risk to boost
 884          * performance.
 885          * This is really something the driver could do for us because this
 886          * does conform to standards outside of Apple Quicktime.
 887          */
 888         i_offset = 0x2e;
 889         p_app1.i_DQT_offset = hton32( i_offset );
 890         i_offset = 0xb4;
 891         p_app1.i_DHT_offset = hton32( i_offset );
 892         i_offset = 0x258;
 893         p_app1.i_SOF_offset = hton32( i_offset );
 894         i_offset = 0x26b;
 895         p_app1.i_SOS_offset = hton32( i_offset );
 896         i_offset = 0x279;
 897         p_app1.i_data_offset = hton32( i_offset );
 898         memcpy(mjpeg.APP_data, &p_app1, sizeof(struct quicktime_mjpeg_app1));
 899
 900         /* SOF and SOS aren't specified by the mjpeg API because they aren't
 901          * optional.  They will be present in the output. */
 902         mjpeg.jpeg_markers = JPEG_MARKER_DHT | JPEG_MARKER_DQT;
 903
 904         if( v4l1_ioctl( i_fd, MJPIOC_S_PARAMS, &mjpeg ) < 0 )
 905         {
 906             msg_Err( p_demux, "cannot set mjpeg params (%m)" );
 907             goto vdev_failed;
 908         }
 909
 910         p_sys->i_width = mjpeg.img_width * mjpeg.HorDcm;
 911         p_sys->i_height = mjpeg.img_height * mjpeg.VerDcm *
 912             mjpeg.field_per_buff;
 913     }
 914
 915     /* fix width/height */
 916     if( !p_sys->b_mjpeg && ( p_sys->i_width == 0 || p_sys->i_height == 0 ) )
 917     {
 918         struct video_window vid_win;
 919
 920         if( v4l1_ioctl( i_fd, VIDIOCGWIN, &vid_win ) < 0 )
 921         {
 922             msg_Err( p_demux, "cannot get win (%m)" );
 923             goto vdev_failed;
 924         }
 925         p_sys->i_width  = vid_win.width;
 926         p_sys->i_height = vid_win.height;
 927
 928         if( !p_sys->i_width || !p_sys->i_height )
 929         {
 930             p_sys->i_width = p_sys->vid_cap.maxwidth;
 931             p_sys->i_height = p_sys->vid_cap.maxheight;
 932         }
 933
 934         if( !p_sys->i_width || !p_sys->i_height )
 935         {
 936             msg_Err( p_demux, "invalid video size (%ix%i)",
 937                      p_sys->i_width, p_sys->i_height );
 938             goto vdev_failed;
 939         }
 940
 941         msg_Dbg( p_demux, "will use %dx%d", p_sys->i_width, p_sys->i_height );
 942     }
 943
 944     if( !p_sys->b_mjpeg )
 945     {
 946         /* set hue/color/.. */
 947         if( v4l1_ioctl( i_fd, VIDIOCGPICT, &p_sys->vid_picture ) == 0 )
 948         {
 949             struct video_picture vid_picture = p_sys->vid_picture;
 950
 951             if( p_sys->i_brightness >= 0 && p_sys->i_brightness < 65536 )
 952             {
 953                 vid_picture.brightness = p_sys->i_brightness;
 954             }
 955             if( p_sys->i_colour >= 0 && p_sys->i_colour < 65536 )
 956             {
 957                 vid_picture.colour = p_sys->i_colour;
 958             }
 959             if( p_sys->i_hue >= 0 && p_sys->i_hue < 65536 )
 960             {
 961                 vid_picture.hue = p_sys->i_hue;
 962             }
 963             if( p_sys->i_contrast  >= 0 && p_sys->i_contrast < 65536 )
 964             {
 965                 vid_picture.contrast = p_sys->i_contrast;
 966             }
 967             if( v4l1_ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
 968             {
 969                 msg_Dbg( p_demux, "v4l device uses brightness: %d",
 970                          vid_picture.brightness );
 971                 msg_Dbg( p_demux, "v4l device uses colour: %d",
 972                          vid_picture.colour );
 973                 msg_Dbg( p_demux, "v4l device uses hue: %d", vid_picture.hue );
 974                 msg_Dbg( p_demux, "v4l device uses contrast: %d",
 975                          vid_picture.contrast );
 976                 p_sys->vid_picture = vid_picture;
 977             }
 978         }
 979
 980         /* Find out video format used by device */
 981         if( v4l1_ioctl( i_fd, VIDIOCGPICT, &p_sys->vid_picture ) == 0 )
 982         {
 983             struct video_picture vid_picture = p_sys->vid_picture;
 984             char *psz;
 985             int i;
 986
 987             p_sys->i_fourcc = 0;
 988
 989             psz = var_CreateGetString( p_demux, "v4l-chroma" );
 990
 991             const vlc_fourcc_t i_chroma =
 992                 vlc_fourcc_GetCodecFromString( VIDEO_ES, psz );
 993             if( i_chroma )
 994             {
 995                 vid_picture.palette = 0;
 996
 997                 /* Find out v4l chroma code */
 998                 for( i = 0; v4lchroma_to_fourcc[i].i_v4l != 0; i++ )
 999                 {
1000                     if( v4lchroma_to_fourcc[i].i_fourcc == i_chroma )
1001                     {
1002                         vid_picture.palette = v4lchroma_to_fourcc[i].i_v4l;
1003                         break;
1004                     }
1005                 }
1006             }
1007             free( psz );
1008
1009             if( vid_picture.palette &&
1010                 !v4l1_ioctl( i_fd, VIDIOCSPICT, &vid_picture ) )
1011             {
1012                 p_sys->vid_picture = vid_picture;
1013             }
1014             else
1015             {
1016                 /* Try to set the format to something easy to encode */
1017                 vid_picture.palette = VIDEO_PALETTE_YUV420P;
1018                 if( v4l1_ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
1019                 {
1020                     p_sys->vid_picture = vid_picture;
1021                 }
1022                 else
1023                 {
1024                     vid_picture.palette = VIDEO_PALETTE_YUV422P;
1025                     if( v4l1_ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
1026                     {
1027                         p_sys->vid_picture = vid_picture;
1028                     }
1029                 }
1030             }
1031
1032             /* Find out final format */
1033             for( i = 0; v4lchroma_to_fourcc[i].i_v4l != 0; i++ )
1034             {
1035                 if( v4lchroma_to_fourcc[i].i_v4l == p_sys->vid_picture.palette)
1036                 {
1037                     p_sys->i_fourcc = v4lchroma_to_fourcc[i].i_fourcc;
1038                     break;
1039                 }
1040             }
1041         }
1042         else
1043         {
1044             msg_Err( p_demux, "ioctl VIDIOCGPICT failed" );
1045             goto vdev_failed;
1046         }
1047     }
1048
1049     if( p_sys->b_mjpeg )
1050     {
1051         int i;
1052
1053         p_sys->mjpeg_buffers.count = 8;
1054         p_sys->mjpeg_buffers.size = MJPEG_BUFFER_SIZE;
1055
1056         if( v4l1_ioctl( i_fd, MJPIOC_REQBUFS, &p_sys->mjpeg_buffers ) < 0 )
1057         {
1058             msg_Err( p_demux, "mmap unsupported" );
1059             goto vdev_failed;
1060         }
1061
1062         p_sys->p_video_mmap = v4l1_mmap( 0,
1063                 p_sys->mjpeg_buffers.size * p_sys->mjpeg_buffers.count,
1064                 PROT_READ | PROT_WRITE, MAP_SHARED, i_fd, 0 );
1065         if( p_sys->p_video_mmap == MAP_FAILED )
1066         {
1067             msg_Err( p_demux, "mmap failed" );
1068             goto vdev_failed;
1069         }
1070
1071         p_sys->i_fourcc  = VLC_CODEC_MJPG;
1072         p_sys->i_frame_pos = -1;
1073
1074         /* queue up all the frames */
1075         for( i = 0; i < (int)p_sys->mjpeg_buffers.count; i++ )
1076         {
1077             if( v4l1_ioctl( i_fd, MJPIOC_QBUF_CAPT, &i ) < 0 )
1078             {
1079                 msg_Err( p_demux, "unable to queue frame" );
1080                 goto vdev_failed;
1081             }
1082         }
1083     }
1084     else
1085     {
1086         /* Fill in picture_t fields */
1087         if( picture_Setup( &p_sys->pic, p_sys->i_fourcc,
1088                            p_sys->i_width, p_sys->i_height, p_sys->i_width *
1089                            VOUT_ASPECT_FACTOR / p_sys->i_height ) )
1090         {
1091             msg_Err( p_demux, "unsupported chroma" );
1092             goto vdev_failed;
1093         }
1094         p_sys->i_video_frame_size = 0;
1095         for( i = 0; i < p_sys->pic.i_planes; i++ )
1096         {
1097             p_sys->i_video_frame_size += p_sys->pic.p[i].i_visible_lines *
1098               p_sys->pic.p[i].i_visible_pitch;
1099         }
1100
1101         msg_Dbg( p_demux, "v4l device uses frame size: %i",
1102                  p_sys->i_video_frame_size );
1103         msg_Dbg( p_demux, "v4l device uses chroma: %4.4s",
1104                 (char*)&p_sys->i_fourcc );
1105
1106         /* Allocate mmap buffer */
1107         if( v4l1_ioctl( i_fd, VIDIOCGMBUF, &p_sys->vid_mbuf ) < 0 )
1108         {
1109             msg_Err( p_demux, "mmap unsupported" );
1110             goto vdev_failed;
1111         }
1112
1113         p_sys->p_video_mmap = v4l1_mmap( 0, p_sys->vid_mbuf.size,
1114                                     PROT_READ|PROT_WRITE, MAP_SHARED,
1115                                     i_fd, 0 );
1116         if( p_sys->p_video_mmap == MAP_FAILED )
1117         {
1118             /* FIXME -> normal read */
1119             msg_Err( p_demux, "mmap failed" );
1120             goto vdev_failed;
1121         }
1122
1123         /* init grabbing */
1124         p_sys->vid_mmap.frame  = 0;
1125         p_sys->vid_mmap.width  = p_sys->i_width;
1126         p_sys->vid_mmap.height = p_sys->i_height;
1127         p_sys->vid_mmap.format = p_sys->vid_picture.palette;
1128         if( v4l1_ioctl( i_fd, VIDIOCMCAPTURE, &p_sys->vid_mmap ) < 0 )
1129         {
1130             msg_Warn( p_demux, "%4.4s refused", (char*)&p_sys->i_fourcc );
1131             msg_Err( p_demux, "chroma selection failed" );
1132             goto vdev_failed;
1133         }
1134     }
1135     return i_fd;
1136
1137 vdev_failed:
1138
1139     if( i_fd >= 0 ) v4l1_close( i_fd );
1140     return -1;
1141 }
1142
1143 /*****************************************************************************
1144  * GrabVideo:
1145  *****************************************************************************/
1146 static uint8_t *GrabCapture( demux_t *p_demux )
1147 {
1148     demux_sys_t *p_sys = p_demux->p_sys;
1149     int i_captured_frame = p_sys->i_frame_pos;
1150
1151     p_sys->vid_mmap.frame = (p_sys->i_frame_pos + 1) % p_sys->vid_mbuf.frames;
1152
1153     while( v4l1_ioctl( p_sys->i_fd, VIDIOCMCAPTURE, &p_sys->vid_mmap ) < 0 )
1154     {
1155         if( errno != EAGAIN )
1156         {
1157             msg_Err( p_demux, "failed capturing new frame" );
1158             return NULL;
1159         }
1160
1161         if( !vlc_object_alive (p_demux) )
1162         {
1163             return NULL;
1164         }
1165
1166         msg_Dbg( p_demux, "grab failed, trying again" );
1167     }
1168
1169     while( v4l1_ioctl(p_sys->i_fd, VIDIOCSYNC, &p_sys->i_frame_pos) < 0 )
1170     {
1171         if( errno != EAGAIN && errno != EINTR )
1172         {
1173             msg_Err( p_demux, "failed syncing new frame" );
1174             return NULL;
1175         }
1176     }
1177
1178     p_sys->i_frame_pos = p_sys->vid_mmap.frame;
1179     /* leave i_video_frame_size alone */
1180     return p_sys->p_video_mmap + p_sys->vid_mbuf.offsets[i_captured_frame];
1181 }
1182
1183 static uint8_t *GrabMJPEG( demux_t *p_demux )
1184 {
1185     demux_sys_t *p_sys = p_demux->p_sys;
1186     struct mjpeg_sync sync;
1187     uint8_t *p_frame, *p_field, *p;
1188     uint16_t tag;
1189     uint32_t i_size;
1190     struct quicktime_mjpeg_app1 *p_app1 = NULL;
1191
1192     /* re-queue the last frame we sync'd */
1193     if( p_sys->i_frame_pos != -1 )
1194     {
1195         while( v4l1_ioctl( p_sys->i_fd, MJPIOC_QBUF_CAPT,
1196                                        &p_sys->i_frame_pos ) < 0 )
1197         {
1198             if( errno != EAGAIN && errno != EINTR )
1199             {
1200                 msg_Err( p_demux, "failed capturing new frame" );
1201                 return NULL;
1202             }
1203         }
1204     }
1205
1206     /* sync on the next frame */
1207     while( v4l1_ioctl( p_sys->i_fd, MJPIOC_SYNC, &sync ) < 0 )
1208     {
1209         if( errno != EAGAIN && errno != EINTR )
1210         {
1211             msg_Err( p_demux, "failed syncing new frame" );
1212             return NULL;
1213         }
1214     }
1215
1216     p_sys->i_frame_pos = sync.frame;
1217     p_frame = p_sys->p_video_mmap + p_sys->mjpeg_buffers.size * sync.frame;
1218
1219     /* p_frame now points to the data.  fix up the Quicktime APP1 marker */
1220     tag = 0xffd9;
1221     tag = hton16( tag );
1222     p_field = p_frame;
1223
1224     /* look for EOI */
1225     p = memmem( p_field, sync.length, &tag, 2 );
1226
1227     if( p )
1228     {
1229         p += 2; /* data immediately following EOI */
1230         /* UNALIGNED! */
1231         p_app1 = (struct quicktime_mjpeg_app1 *)(p_field + 6);
1232
1233         i_size = ((uint32_t)(p - p_field));
1234         i_size = hton32( i_size );
1235         memcpy( &p_app1->i_field_size, &i_size, 4 );
1236
1237         while( *p == 0xff && *(p+1) == 0xff )
1238             p++;
1239
1240         i_size = ((uint32_t)(p - p_field));
1241         i_size = hton32( i_size );
1242         memcpy( &p_app1->i_padded_field_size, &i_size, 4 );
1243     }
1244
1245     tag = 0xffd8;
1246     tag = hton16( tag );
1247     p_field = memmem( p, sync.length - (size_t)(p - p_frame), &tag, 2 );
1248
1249     if( p_field )
1250     {
1251         i_size = (uint32_t)(p_field - p_frame);
1252         i_size = hton32( i_size );
1253         memcpy( &p_app1->i_next_field, &i_size, 4 );
1254
1255         /* UNALIGNED! */
1256         p_app1 = (struct quicktime_mjpeg_app1 *)(p_field + 6);
1257         tag = 0xffd9;
1258         tag = hton16( tag );
1259         p = memmem( p_field, sync.length - (size_t)(p_field - p_frame),
1260                 &tag, 2 );
1261
1262         if( !p )
1263         {
1264             /* sometimes the second field doesn't have the EOI.  just put it
1265              * there
1266              */
1267             p = p_frame + sync.length;
1268             memcpy( p, &tag, 2 );
1269             sync.length += 2;
1270         }
1271
1272         p += 2;
1273         i_size = (uint32_t)(p - p_field);
1274         i_size = hton32( i_size );
1275         memcpy( &p_app1->i_field_size, &i_size, 4 );
1276         i_size = (uint32_t)(sync.length - (uint32_t)(p_field - p_frame));
1277         i_size = hton32( i_size );
1278         memcpy( &p_app1->i_padded_field_size, &i_size, 4 );
1279     }
1280
1281     p_sys->i_video_frame_size = sync.length;
1282     return p_frame;
1283 }
1284
1285 static block_t *GrabVideo( demux_t *p_demux )
1286 {
1287     demux_sys_t *p_sys = p_demux->p_sys;
1288     uint8_t     *p_frame;
1289     block_t     *p_block;
1290
1291     if( p_sys->f_fps >= 0.1 && p_sys->i_video_pts > 0 )
1292     {
1293         mtime_t i_dur = (mtime_t)((double)1000000 / (double)p_sys->f_fps);
1294
1295         /* Did we wait long enough ? (frame rate reduction) */
1296         if( p_sys->i_video_pts + i_dur > mdate() ) return 0;
1297     }
1298
1299     if( p_sys->b_mjpeg ) p_frame = GrabMJPEG( p_demux );
1300     else p_frame = GrabCapture( p_demux );
1301
1302     if( !p_frame ) return 0;
1303
1304     if( !( p_block = block_New( p_demux, p_sys->i_video_frame_size ) ) )
1305     {
1306         msg_Warn( p_demux, "cannot get block" );
1307         return 0;
1308     }
1309
1310     memcpy( p_block->p_buffer, p_frame, p_sys->i_video_frame_size );
1311     p_sys->i_video_pts = p_block->i_pts = p_block->i_dts = mdate();
1312
1313     return p_block;
1314 }