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 /*****************************************************************************
  68  * Module descriptior
  69  *****************************************************************************/
  70 static int  Open ( vlc_object_t * );
  71 static void Close( vlc_object_t * );
  72
  73 #define CACHING_TEXT N_("Caching value in ms")
  74 #define CACHING_LONGTEXT N_( \
  75     "Caching value for V4L captures. This " \
  76     "value should be set in milliseconds." )
  77 #define VDEV_TEXT N_("Video device name")
  78 #define VDEV_LONGTEXT N_( \
  79     "Name of the video device to use. " \
  80     "If you don't specify anything, no video device will be used.")
  81 #define CHROMA_TEXT N_("Video input chroma format")
  82 #define CHROMA_LONGTEXT N_( \
  83     "Force the Video4Linux video device to use a specific chroma format " \
  84     "(eg. I420 (default), RV24, etc.)")
  85 #define FREQUENCY_TEXT N_( "Frequency" )
  86 #define FREQUENCY_LONGTEXT N_( \
  87     "Frequency to capture (in kHz), if applicable." )
  88 #define CHANNEL_TEXT N_( "Channel" )
  89 #define CHANNEL_LONGTEXT N_( \
  90     "Channel of the card to use (Usually, 0 = tuner, " \
  91     "1 = composite, 2 = svideo)." )
  92 #define NORM_TEXT N_( "Norm" )
  93 #define NORM_LONGTEXT N_( \
  94     "Norm of the stream (Automatic, SECAM, PAL, or NTSC)." )
  95 #define AUDIO_TEXT N_( "Audio Channel" )
  96 #define AUDIO_LONGTEXT N_( \
  97     "Audio Channel to use, if there are several audio inputs." )
  98 #define WIDTH_TEXT N_( "Width" )
  99 #define WIDTH_LONGTEXT N_( "Width of the stream to capture " \
 100     "(-1 for autodetect)." )
 101 #define HEIGHT_TEXT N_( "Height" )
 102 #define HEIGHT_LONGTEXT N_( "Height of the stream to capture " \
 103     "(-1 for autodetect)." )
 104 #define BRIGHTNESS_TEXT N_( "Brightness" )
 105 #define BRIGHTNESS_LONGTEXT N_( \
 106     "Brightness of the video input." )
 107 #define HUE_TEXT N_( "Hue" )
 108 #define HUE_LONGTEXT N_( \
 109     "Hue of the video input." )
 110 #define COLOUR_TEXT N_( "Color" )
 111 #define COLOUR_LONGTEXT N_( \
 112     "Color of the video input." )
 113 #define CONTRAST_TEXT N_( "Contrast" )
 114 #define CONTRAST_LONGTEXT N_( \
 115     "Contrast of the video input." )
 116 #define TUNER_TEXT N_( "Tuner" )
 117 #define TUNER_LONGTEXT N_( "Tuner to use, if there are several ones." )
 118 #define MJPEG_TEXT N_( "MJPEG" )
 119 #define MJPEG_LONGTEXT N_(  \
 120     "Set this option if the capture device outputs MJPEG" )
 121 #define DECIMATION_TEXT N_( "Decimation" )
 122 #define DECIMATION_LONGTEXT N_( \
 123     "Decimation level for MJPEG streams" )
 124 #define QUALITY_TEXT N_( "Quality" )
 125 #define QUALITY_LONGTEXT N_( "Quality of the stream." )
 126 #define FPS_TEXT N_( "Framerate" )
 127 #define FPS_LONGTEXT N_( "Framerate to capture, if applicable " \
 128     "(-1 for autodetect)." )
 129
 130 #define AUDIO_DEPRECATED_ERROR N_( \
 131     "Alsa or OSS audio capture in the v4l access is deprecated. " \
 132     "please use 'v4l:/""/ :input-slave=alsa:/""/' or " \
 133     "'v4l:/""/ :input-slave=oss:/""/' instead." )
 134
 135 static const int i_norm_list[] =
 136     { VIDEO_MODE_AUTO, VIDEO_MODE_SECAM, VIDEO_MODE_PAL, VIDEO_MODE_NTSC };
 137 static const char *const psz_norm_list_text[] =
 138     { N_("Automatic"), N_("SECAM"), N_("PAL"),  N_("NTSC") };
 139
 140 #define V4L_DEFAULT "/dev/video"
 141
 142 vlc_module_begin ()
 143     set_shortname( N_("Video4Linux") )
 144     set_description( N_("Video4Linux input") )
 145     set_category( CAT_INPUT )
 146     set_subcategory( SUBCAT_INPUT_ACCESS )
 147
 148     add_integer( "v4l-caching", DEFAULT_PTS_DELAY / 1000, NULL,
 149                  CACHING_TEXT, CACHING_LONGTEXT, true )
 150     add_obsolete_string( "v4l-vdev" );
 151     add_obsolete_string( "v4l-adev" );
 152     add_string( "v4l-chroma", NULL, NULL, CHROMA_TEXT, CHROMA_LONGTEXT,
 153                 true )
 154     add_float( "v4l-fps", -1.0, NULL, FPS_TEXT, FPS_LONGTEXT, true )
 155     add_obsolete_integer( "v4l-samplerate" );
 156     add_integer( "v4l-channel", 0, NULL, CHANNEL_TEXT, CHANNEL_LONGTEXT,
 157                 true )
 158     add_integer( "v4l-tuner", -1, NULL, TUNER_TEXT, TUNER_LONGTEXT, true )
 159     add_integer( "v4l-norm", VIDEO_MODE_AUTO, NULL, NORM_TEXT, NORM_LONGTEXT,
 160                 false )
 161         change_integer_list( i_norm_list, psz_norm_list_text, NULL );
 162     add_integer( "v4l-frequency", -1, NULL, FREQUENCY_TEXT, FREQUENCY_LONGTEXT,
 163                 false )
 164     add_integer( "v4l-audio", -1, NULL, AUDIO_TEXT, AUDIO_LONGTEXT, true )
 165     add_obsolete_bool( "v4l-stereo" );
 166     add_integer( "v4l-width", 0, NULL, WIDTH_TEXT, WIDTH_LONGTEXT, true )
 167     add_integer( "v4l-height", 0, NULL, HEIGHT_TEXT, HEIGHT_LONGTEXT,
 168                 true )
 169     add_integer( "v4l-brightness", -1, NULL, BRIGHTNESS_TEXT,
 170                 BRIGHTNESS_LONGTEXT, true )
 171     add_integer( "v4l-colour", -1, NULL, COLOUR_TEXT, COLOUR_LONGTEXT,
 172                 true )
 173     add_integer( "v4l-hue", -1, NULL, HUE_TEXT, HUE_LONGTEXT, true )
 174     add_integer( "v4l-contrast", -1, NULL, CONTRAST_TEXT, CONTRAST_LONGTEXT,
 175                 true )
 176     add_bool( "v4l-mjpeg", false, NULL, MJPEG_TEXT, MJPEG_LONGTEXT,
 177             true )
 178     add_integer( "v4l-decimation", 1, NULL, DECIMATION_TEXT,
 179             DECIMATION_LONGTEXT, true )
 180     add_integer( "v4l-quality", 100, NULL, QUALITY_TEXT, QUALITY_LONGTEXT,
 181             true )
 182
 183     add_shortcut( "v4l" )
 184     set_capability( "access_demux", 10 )
 185     set_callbacks( Open, Close )
 186 vlc_module_end ()
 187
 188 /*****************************************************************************
 189  * Access: local prototypes
 190  *****************************************************************************/
 191 static int Demux  ( demux_t * );
 192 static int Control( demux_t *, int, va_list );
 193
 194 static void ParseMRL    ( demux_t * );
 195 static int  OpenVideoDev( demux_t *, char * );
 196 static block_t *GrabVideo( demux_t * );
 197
 198 #define MJPEG_BUFFER_SIZE (256*1024)
 199
 200 struct quicktime_mjpeg_app1
 201 {
 202     uint32_t    i_reserved;             /* set to 0 */
 203     uint32_t    i_tag;                  /* 'mjpg' */
 204     uint32_t    i_field_size;           /* offset following EOI */
 205     uint32_t    i_padded_field_size;    /* offset following EOI+pad */
 206     uint32_t    i_next_field;           /* offset to next field */
 207     uint32_t    i_DQT_offset;
 208     uint32_t    i_DHT_offset;
 209     uint32_t    i_SOF_offset;
 210     uint32_t    i_SOS_offset;
 211     uint32_t    i_data_offset;          /* following SOS marker data */
 212 };
 213
 214 static const struct
 215 {
 216     int i_v4l;
 217     vlc_fourcc_t i_fourcc;
 218
 219 } v4lchroma_to_fourcc[] =
 220 {
 221     { VIDEO_PALETTE_GREY, VLC_CODEC_GREY },
 222     { VIDEO_PALETTE_HI240, VLC_FOURCC( 'I', '2', '4', '0' ) },
 223     { VIDEO_PALETTE_RGB565, VLC_CODEC_RGB16 },
 224     { VIDEO_PALETTE_RGB555, VLC_CODEC_RGB15 },
 225     { VIDEO_PALETTE_RGB24, VLC_CODEC_RGB24 },
 226     { VIDEO_PALETTE_RGB32, VLC_CODEC_RGB32 },
 227     { VIDEO_PALETTE_YUV422, VLC_CODEC_YUYV },
 228     { VIDEO_PALETTE_YUYV, VLC_CODEC_YUYV },
 229     { VIDEO_PALETTE_UYVY, VLC_CODEC_UYVY },
 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_CODEC_I422 },
 234     { VIDEO_PALETTE_YUV420P, VLC_CODEC_I420 },
 235     { VIDEO_PALETTE_YUV411P, VLC_CODEC_I411 },
 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_CODEC_RGB15:
 358             fmt.video.i_rmask = 0x001f;
 359             fmt.video.i_gmask = 0x03e0;
 360             fmt.video.i_bmask = 0x7c00;
 361             break;
 362         case VLC_CODEC_RGB16:
 363             fmt.video.i_rmask = 0x001f;
 364             fmt.video.i_gmask = 0x07e0;
 365             fmt.video.i_bmask = 0xf800;
 366             break;
 367         case VLC_CODEC_RGB24:
 368         case VLC_CODEC_RGB32:
 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_CAN_CONTROL_PACE:
 428             pb = (bool*)va_arg( args, bool * );
 429             *pb = false;
 430             return VLC_SUCCESS;
 431
 432         case DEMUX_GET_PTS_DELAY:
 433             pi64 = (int64_t*)va_arg( args, int64_t * );
 434             *pi64 = (int64_t)var_GetInteger( p_demux, "v4l-caching" ) * 1000;
 435             return VLC_SUCCESS;
 436
 437         case DEMUX_GET_TIME:
 438             pi64 = (int64_t*)va_arg( args, int64_t * );
 439             *pi64 = mdate();
 440             return VLC_SUCCESS;
 441
 442         /* TODO implement others */
 443         default:
 444             return VLC_EGENERIC;
 445     }
 446
 447     return VLC_EGENERIC;
 448 }
 449
 450 /*****************************************************************************
 451  * Demux:
 452  *****************************************************************************/
 453 static int Demux( demux_t *p_demux )
 454 {
 455     demux_sys_t *p_sys = p_demux->p_sys;
 456
 457     block_t *p_block = GrabVideo( p_demux );
 458
 459     if( !p_block )
 460     {
 461         msleep( 10000 ); /* Unfortunately v4l doesn't allow polling */
 462         return 1;
 463     }
 464
 465     es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
 466     es_out_Send( p_demux->out, p_sys->p_es, p_block );
 467
 468     return 1;
 469 }
 470
 471 /*****************************************************************************
 472  * ParseMRL: parse the options contained in the MRL
 473  *****************************************************************************/
 474 static void ParseMRL( demux_t *p_demux )
 475 {
 476     demux_sys_t *p_sys = p_demux->p_sys;
 477
 478     char *psz_dup = strdup( p_demux->psz_path );
 479     char *psz_parser = psz_dup;
 480
 481     while( *psz_parser && *psz_parser != ':' )
 482     {
 483         psz_parser++;
 484     }
 485
 486     if( *psz_parser == ':' )
 487     {
 488         /* read options */
 489         for( ;; )
 490         {
 491             *psz_parser++ = '\0';
 492             if( !strncmp( psz_parser, "channel=", strlen( "channel=" ) ) )
 493             {
 494                 p_sys->i_channel = strtol( psz_parser + strlen( "channel=" ),
 495                                            &psz_parser, 0 );
 496             }
 497             else if( !strncmp( psz_parser, "norm=", strlen( "norm=" ) ) )
 498             {
 499                 psz_parser += strlen( "norm=" );
 500                 if( !strncmp( psz_parser, "pal", strlen( "pal" ) ) )
 501                 {
 502                     p_sys->i_norm = VIDEO_MODE_PAL;
 503                     psz_parser += strlen( "pal" );
 504                 }
 505                 else if( !strncmp( psz_parser, "ntsc", strlen( "ntsc" ) ) )
 506                 {
 507                     p_sys->i_norm = VIDEO_MODE_NTSC;
 508                     psz_parser += strlen( "ntsc" );
 509                 }
 510                 else if( !strncmp( psz_parser, "secam", strlen( "secam" ) ) )
 511                 {
 512                     p_sys->i_norm = VIDEO_MODE_SECAM;
 513                     psz_parser += strlen( "secam" );
 514                 }
 515                 else if( !strncmp( psz_parser, "auto", strlen( "auto" ) ) )
 516                 {
 517                     p_sys->i_norm = VIDEO_MODE_AUTO;
 518                     psz_parser += strlen( "auto" );
 519                 }
 520                 else
 521                 {
 522                     p_sys->i_norm = strtol( psz_parser, &psz_parser, 0 );
 523                 }
 524             }
 525             else if( !strncmp( psz_parser, "frequency=",
 526                                strlen( "frequency=" ) ) )
 527             {
 528                 p_sys->i_frequency =
 529                     strtol( psz_parser + strlen( "frequency=" ),
 530                             &psz_parser, 0 );
 531                 if( p_sys->i_frequency < 30000 )
 532                 {
 533                     msg_Warn( p_demux, "v4l syntax has changed : "
 534                               "'frequency' is now channel frequency in kHz");
 535                 }
 536             }
 537             else if( !strncmp( psz_parser, "audio=", strlen( "audio=" ) ) )
 538             {
 539                 p_sys->i_audio = strtol( psz_parser + strlen( "audio=" ),
 540                                          &psz_parser, 0 );
 541             }
 542             else if( !strncmp( psz_parser, "size=", strlen( "size=" ) ) )
 543             {
 544                 psz_parser += strlen( "size=" );
 545                 if( !strncmp( psz_parser, "subqcif", strlen( "subqcif" ) ) )
 546                 {
 547                     p_sys->i_width  = 128;
 548                     p_sys->i_height = 96;
 549                 }
 550                 else if( !strncmp( psz_parser, "qsif", strlen( "qsif" ) ) )
 551                 {
 552                     p_sys->i_width  = 160;
 553                     p_sys->i_height = 120;
 554                 }
 555                 else if( !strncmp( psz_parser, "qcif", strlen( "qcif" ) ) )
 556                 {
 557                     p_sys->i_width  = 176;
 558                     p_sys->i_height = 144;
 559                 }
 560                 else if( !strncmp( psz_parser, "sif", strlen( "sif" ) ) )
 561                 {
 562                     p_sys->i_width  = 320;
 563                     p_sys->i_height = 244;
 564                 }
 565                 else if( !strncmp( psz_parser, "cif", strlen( "cif" ) ) )
 566                 {
 567                     p_sys->i_width  = 352;
 568                     p_sys->i_height = 288;
 569                 }
 570                 else if( !strncmp( psz_parser, "vga", strlen( "vga" ) ) )
 571                 {
 572                     p_sys->i_width  = 640;
 573                     p_sys->i_height = 480;
 574                 }
 575                 else
 576                 {
 577                     /* widthxheight */
 578                     p_sys->i_width = strtol( psz_parser, &psz_parser, 0 );
 579                     if( *psz_parser == 'x' || *psz_parser == 'X')
 580                     {
 581                         p_sys->i_height = strtol( psz_parser + 1,
 582                                                   &psz_parser, 0 );
 583                     }
 584                     msg_Dbg( p_demux, "WxH %dx%d", p_sys->i_width,
 585                              p_sys->i_height );
 586                 }
 587             }
 588             else if( !strncmp( psz_parser, "brightness=", strlen( "brightness=" ) ) )
 589             {
 590                 p_sys->i_brightness = strtol( psz_parser + strlen( "brightness=" ),
 591                                               &psz_parser, 0 );
 592             }
 593             else if( !strncmp( psz_parser, "colour=", strlen( "colour=" ) ) )
 594             {
 595                 p_sys->i_colour = strtol( psz_parser + strlen( "colour=" ),
 596                                           &psz_parser, 0 );
 597             }
 598             else if( !strncmp( psz_parser, "hue=", strlen( "hue=" ) ) )
 599             {
 600                 p_sys->i_hue = strtol( psz_parser + strlen( "hue=" ),
 601                                        &psz_parser, 0 );
 602             }
 603             else if( !strncmp( psz_parser, "contrast=", strlen( "contrast=" ) ) )
 604             {
 605                 p_sys->i_contrast = strtol( psz_parser + strlen( "contrast=" ),
 606                                             &psz_parser, 0 );
 607             }
 608             else if( !strncmp( psz_parser, "tuner=", strlen( "tuner=" ) ) )
 609             {
 610                 p_sys->i_tuner = strtol( psz_parser + strlen( "tuner=" ),
 611                                          &psz_parser, 0 );
 612             }
 613             else if( !strncmp( psz_parser, "mjpeg", strlen( "mjpeg" ) ) )
 614             {
 615                 psz_parser += strlen( "mjpeg" );
 616
 617                 p_sys->b_mjpeg = true;
 618             }
 619             else if( !strncmp( psz_parser, "decimation=",
 620                         strlen( "decimation=" ) ) )
 621             {
 622                 p_sys->i_decimation =
 623                     strtol( psz_parser + strlen( "decimation=" ),
 624                             &psz_parser, 0 );
 625             }
 626             else if( !strncmp( psz_parser, "quality=",
 627                         strlen( "quality=" ) ) )
 628             {
 629                 p_sys->i_quality =
 630                     strtol( psz_parser + strlen( "quality=" ),
 631                             &psz_parser, 0 );
 632             }
 633             else if( !strncmp( psz_parser, "fps=", strlen( "fps=" ) ) )
 634             {
 635                 p_sys->f_fps = us_strtof( psz_parser + strlen( "fps=" ),
 636                                           &psz_parser );
 637             }
 638             else if( !strncmp( psz_parser, "adev=", strlen( "adev=" ) )
 639              || !strncmp( psz_parser, "samplerate=", strlen( "samplerate=" ) )
 640              || !strncmp( psz_parser, "stereo", strlen( "stereo" ) )
 641              || !strncmp( psz_parser, "mono", strlen( "mono" ) ) )
 642             {
 643                 if( strchr( psz_parser, ':' ) )
 644                     psz_parser = strchr( psz_parser, ':' );
 645                 else
 646                     psz_parser += strlen( psz_parser );
 647                 msg_Err( p_demux, AUDIO_DEPRECATED_ERROR );
 648             }
 649             else
 650             {
 651                 msg_Warn( p_demux, "unknown option" );
 652             }
 653
 654             while( *psz_parser && *psz_parser != ':' )
 655             {
 656                 psz_parser++;
 657             }
 658
 659             if( *psz_parser == '\0' )
 660             {
 661                 break;
 662             }
 663         }
 664     }
 665
 666     if( *psz_dup )
 667         p_sys->psz_device = strdup( psz_dup );
 668     else
 669         p_sys->psz_device = strdup( V4L_DEFAULT );
 670     free( psz_dup );
 671 }
 672
 673 /*****************************************************************************
 674  * OpenVideoDev:
 675  *****************************************************************************/
 676 static int OpenVideoDev( demux_t *p_demux, char *psz_device )
 677 {
 678     demux_sys_t *p_sys = p_demux->p_sys;
 679     int i_fd;
 680
 681     struct video_channel vid_channel;
 682     struct mjpeg_params mjpeg;
 683     int i;
 684
 685     if( ( i_fd = open( psz_device, O_RDWR ) ) < 0 )
 686     {
 687         msg_Err( p_demux, "cannot open device (%m)" );
 688         goto vdev_failed;
 689     }
 690
 691     if( ioctl( i_fd, VIDIOCGCAP, &p_sys->vid_cap ) < 0 )
 692     {
 693         msg_Err( p_demux, "cannot get capabilities (%m)" );
 694         goto vdev_failed;
 695     }
 696
 697     msg_Dbg( p_demux,
 698              "V4L device %s %d channels %d audios %d < w < %d %d < h < %d",
 699              p_sys->vid_cap.name,
 700              p_sys->vid_cap.channels,
 701              p_sys->vid_cap.audios,
 702              p_sys->vid_cap.minwidth,  p_sys->vid_cap.maxwidth,
 703              p_sys->vid_cap.minheight, p_sys->vid_cap.maxheight );
 704
 705     if( p_sys->i_channel < 0 || p_sys->i_channel >= p_sys->vid_cap.channels )
 706     {
 707         msg_Dbg( p_demux, "invalid channel, falling back on channel 0" );
 708         p_sys->i_channel = 0;
 709     }
 710     if( p_sys->vid_cap.audios && p_sys->i_audio >= p_sys->vid_cap.audios )
 711     {
 712         msg_Dbg( p_demux, "invalid audio, falling back with no audio" );
 713         p_sys->i_audio = -1;
 714     }
 715
 716     if( p_sys->i_width < p_sys->vid_cap.minwidth ||
 717         p_sys->i_width > p_sys->vid_cap.maxwidth )
 718     {
 719         msg_Dbg( p_demux, "invalid width %i", p_sys->i_width );
 720         p_sys->i_width = 0;
 721     }
 722     if( p_sys->i_height < p_sys->vid_cap.minheight ||
 723         p_sys->i_height > p_sys->vid_cap.maxheight )
 724     {
 725         msg_Dbg( p_demux, "invalid height %i", p_sys->i_height );
 726         p_sys->i_height = 0;
 727     }
 728
 729     if( !( p_sys->vid_cap.type & VID_TYPE_CAPTURE ) )
 730     {
 731         msg_Err( p_demux, "cannot grab" );
 732         goto vdev_failed;
 733     }
 734
 735     vid_channel.channel = p_sys->i_channel;
 736     if( ioctl( i_fd, VIDIOCGCHAN, &vid_channel ) < 0 )
 737     {
 738         msg_Err( p_demux, "cannot get channel infos (%m)" );
 739         goto vdev_failed;
 740     }
 741     msg_Dbg( p_demux,
 742              "setting channel %s(%d) %d tuners flags=0x%x type=0x%x norm=0x%x",
 743              vid_channel.name, vid_channel.channel, vid_channel.tuners,
 744              vid_channel.flags, vid_channel.type, vid_channel.norm );
 745
 746     if( p_sys->i_tuner >= vid_channel.tuners )
 747     {
 748         msg_Dbg( p_demux, "invalid tuner, falling back on tuner 0" );
 749         p_sys->i_tuner = 0;
 750     }
 751
 752     vid_channel.norm = p_sys->i_norm;
 753     if( ioctl( i_fd, VIDIOCSCHAN, &vid_channel ) < 0 )
 754     {
 755         msg_Err( p_demux, "cannot set channel (%m)" );
 756         goto vdev_failed;
 757     }
 758
 759     if( vid_channel.flags & VIDEO_VC_TUNER )
 760     {
 761
 762         /* set tuner */
 763 #if 0
 764         struct video_tuner vid_tuner;
 765         if( p_sys->i_tuner >= 0 )
 766         {
 767             vid_tuner.tuner = p_sys->i_tuner;
 768             if( ioctl( i_fd, VIDIOCGTUNER, &vid_tuner ) < 0 )
 769             {
 770                 msg_Err( p_demux, "cannot get tuner (%m)" );
 771                 goto vdev_failed;
 772             }
 773             msg_Dbg( p_demux, "tuner %s low=%d high=%d, flags=0x%x "
 774                      "mode=0x%x signal=0x%x",
 775                      vid_tuner.name, vid_tuner.rangelow, vid_tuner.rangehigh,
 776                      vid_tuner.flags, vid_tuner.mode, vid_tuner.signal );
 777
 778             msg_Dbg( p_demux, "setting tuner %s (%d)",
 779                      vid_tuner.name, vid_tuner.tuner );
 780
 781             /* FIXME FIXME to be checked FIXME FIXME */
 782             //vid_tuner.mode = p_sys->i_norm;
 783             if( ioctl( i_fd, VIDIOCSTUNER, &vid_tuner ) < 0 )
 784             {
 785                 msg_Err( p_demux, "cannot set tuner (%m)" );
 786                 goto vdev_failed;
 787             }
 788         }
 789 #endif
 790
 791         /* Show a warning if frequency is < than 30000.
 792          * User is certainly usint old syntax. */
 793
 794
 795         /* set frequency */
 796         if( p_sys->i_frequency >= 0 )
 797         {
 798             int driver_frequency = p_sys->i_frequency * 16 /1000;
 799             if( ioctl( i_fd, VIDIOCSFREQ, &driver_frequency ) < 0 )
 800             {
 801                 msg_Err( p_demux, "cannot set frequency (%m)" );
 802                 goto vdev_failed;
 803             }
 804             msg_Dbg( p_demux, "frequency %d (%d)", p_sys->i_frequency,
 805                                                    driver_frequency );
 806         }
 807     }
 808
 809     /* set audio */
 810     if( vid_channel.flags & VIDEO_VC_AUDIO )
 811     {
 812         struct video_audio      vid_audio;
 813
 814         /* XXX TODO volume, balance, ... */
 815         if( p_sys->i_audio >= 0 )
 816         {
 817             vid_audio.audio = p_sys->i_audio;
 818             if( ioctl( i_fd, VIDIOCGAUDIO, &vid_audio ) < 0 )
 819             {
 820                 msg_Err( p_demux, "cannot get audio (%m)" );
 821                 goto vdev_failed;
 822             }
 823
 824             /* unmute audio */
 825             vid_audio.flags &= ~VIDEO_AUDIO_MUTE;
 826
 827             if( ioctl( i_fd, VIDIOCSAUDIO, &vid_audio ) < 0 )
 828             {
 829                 msg_Err( p_demux, "cannot set audio (%m)" );
 830                 goto vdev_failed;
 831             }
 832         }
 833
 834     }
 835
 836     /* establish basic params with input and norm before feeling width
 837      * or height */
 838     if( p_sys->b_mjpeg )
 839     {
 840         struct quicktime_mjpeg_app1 *p_app1;
 841         int32_t i_offset;
 842
 843         if( ioctl( i_fd, MJPIOC_G_PARAMS, &mjpeg ) < 0 )
 844         {
 845             msg_Err( p_demux, "cannot get mjpeg params (%m)" );
 846             goto vdev_failed;
 847         }
 848         mjpeg.input = p_sys->i_channel;
 849         mjpeg.norm  = p_sys->i_norm;
 850         mjpeg.decimation = p_sys->i_decimation;
 851
 852         if( p_sys->i_width )
 853             mjpeg.img_width = p_sys->i_width / p_sys->i_decimation;
 854         if( p_sys->i_height )
 855             mjpeg.img_height = p_sys->i_height / p_sys->i_decimation;
 856
 857         /* establish Quicktime APP1 marker while we are here */
 858         mjpeg.APPn = 1;
 859         mjpeg.APP_len = 40;
 860
 861         /* aligned */
 862         p_app1 = (struct quicktime_mjpeg_app1 *)mjpeg.APP_data;
 863         p_app1->i_reserved = 0;
 864         p_app1->i_tag = VLC_FOURCC( 'm','j','p','g' );
 865         p_app1->i_field_size = 0;
 866         p_app1->i_padded_field_size = 0;
 867         p_app1->i_next_field = 0;
 868         /* XXX WARNING XXX */
 869         /* these's nothing magic about these values.  We are dangerously
 870          * assuming the encoder card is encoding mjpeg-a and is not throwing
 871          * in marker tags we aren't expecting.  It's bad enough we have to
 872          * search through the jpeg output for every frame we grab just to
 873          * find the first field's end marker, so we take this risk to boost
 874          * performance.
 875          * This is really something the driver could do for us because this
 876          * does conform to standards outside of Apple Quicktime.
 877          */
 878         i_offset = 0x2e;
 879         p_app1->i_DQT_offset = hton32( i_offset );
 880         i_offset = 0xb4;
 881         p_app1->i_DHT_offset = hton32( i_offset );
 882         i_offset = 0x258;
 883         p_app1->i_SOF_offset = hton32( i_offset );
 884         i_offset = 0x26b;
 885         p_app1->i_SOS_offset = hton32( i_offset );
 886         i_offset = 0x279;
 887         p_app1->i_data_offset = hton32( i_offset );
 888
 889         /* SOF and SOS aren't specified by the mjpeg API because they aren't
 890          * optional.  They will be present in the output. */
 891         mjpeg.jpeg_markers = JPEG_MARKER_DHT | JPEG_MARKER_DQT;
 892
 893         if( ioctl( i_fd, MJPIOC_S_PARAMS, &mjpeg ) < 0 )
 894         {
 895             msg_Err( p_demux, "cannot set mjpeg params (%m)" );
 896             goto vdev_failed;
 897         }
 898
 899         p_sys->i_width = mjpeg.img_width * mjpeg.HorDcm;
 900         p_sys->i_height = mjpeg.img_height * mjpeg.VerDcm *
 901             mjpeg.field_per_buff;
 902     }
 903
 904     /* fix width/height */
 905     if( !p_sys->b_mjpeg && ( p_sys->i_width == 0 || p_sys->i_height == 0 ) )
 906     {
 907         struct video_window vid_win;
 908
 909         if( ioctl( i_fd, VIDIOCGWIN, &vid_win ) < 0 )
 910         {
 911             msg_Err( p_demux, "cannot get win (%m)" );
 912             goto vdev_failed;
 913         }
 914         p_sys->i_width  = vid_win.width;
 915         p_sys->i_height = vid_win.height;
 916
 917         if( !p_sys->i_width || !p_sys->i_height )
 918         {
 919             p_sys->i_width = p_sys->vid_cap.maxwidth;
 920             p_sys->i_height = p_sys->vid_cap.maxheight;
 921         }
 922
 923         if( !p_sys->i_width || !p_sys->i_height )
 924         {
 925             msg_Err( p_demux, "invalid video size (%ix%i)",
 926                      p_sys->i_width, p_sys->i_height );
 927             goto vdev_failed;
 928         }
 929
 930         msg_Dbg( p_demux, "will use %dx%d", p_sys->i_width, p_sys->i_height );
 931     }
 932
 933     if( !p_sys->b_mjpeg )
 934     {
 935         /* set hue/color/.. */
 936         if( ioctl( i_fd, VIDIOCGPICT, &p_sys->vid_picture ) == 0 )
 937         {
 938             struct video_picture vid_picture = p_sys->vid_picture;
 939
 940             if( p_sys->i_brightness >= 0 && p_sys->i_brightness < 65536 )
 941             {
 942                 vid_picture.brightness = p_sys->i_brightness;
 943             }
 944             if( p_sys->i_colour >= 0 && p_sys->i_colour < 65536 )
 945             {
 946                 vid_picture.colour = p_sys->i_colour;
 947             }
 948             if( p_sys->i_hue >= 0 && p_sys->i_hue < 65536 )
 949             {
 950                 vid_picture.hue = p_sys->i_hue;
 951             }
 952             if( p_sys->i_contrast  >= 0 && p_sys->i_contrast < 65536 )
 953             {
 954                 vid_picture.contrast = p_sys->i_contrast;
 955             }
 956             if( ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
 957             {
 958                 msg_Dbg( p_demux, "v4l device uses brightness: %d",
 959                          vid_picture.brightness );
 960                 msg_Dbg( p_demux, "v4l device uses colour: %d",
 961                          vid_picture.colour );
 962                 msg_Dbg( p_demux, "v4l device uses hue: %d", vid_picture.hue );
 963                 msg_Dbg( p_demux, "v4l device uses contrast: %d",
 964                          vid_picture.contrast );
 965                 p_sys->vid_picture = vid_picture;
 966             }
 967         }
 968
 969         /* Find out video format used by device */
 970         if( ioctl( i_fd, VIDIOCGPICT, &p_sys->vid_picture ) == 0 )
 971         {
 972             struct video_picture vid_picture = p_sys->vid_picture;
 973             char *psz;
 974             int i;
 975
 976             p_sys->i_fourcc = 0;
 977
 978             psz = var_CreateGetString( p_demux, "v4l-chroma" );
 979
 980             const vlc_fourcc_t i_chroma =
 981                 vlc_fourcc_GetCodecFromString( VIDEO_ES, psz );
 982             if( i_chroma )
 983             {
 984                 vid_picture.palette = 0;
 985
 986                 /* Find out v4l chroma code */
 987                 for( i = 0; v4lchroma_to_fourcc[i].i_v4l != 0; i++ )
 988                 {
 989                     if( v4lchroma_to_fourcc[i].i_fourcc == i_chroma )
 990                     {
 991                         vid_picture.palette = v4lchroma_to_fourcc[i].i_v4l;
 992                         break;
 993                     }
 994                 }
 995             }
 996             free( psz );
 997
 998             if( vid_picture.palette &&
 999                 !ioctl( i_fd, VIDIOCSPICT, &vid_picture ) )
1000             {
1001                 p_sys->vid_picture = vid_picture;
1002             }
1003             else
1004             {
1005                 /* Try to set the format to something easy to encode */
1006                 vid_picture.palette = VIDEO_PALETTE_YUV420P;
1007                 if( ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
1008                 {
1009                     p_sys->vid_picture = vid_picture;
1010                 }
1011                 else
1012                 {
1013                     vid_picture.palette = VIDEO_PALETTE_YUV422P;
1014                     if( ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
1015                     {
1016                         p_sys->vid_picture = vid_picture;
1017                     }
1018                 }
1019             }
1020
1021             /* Find out final format */
1022             for( i = 0; v4lchroma_to_fourcc[i].i_v4l != 0; i++ )
1023             {
1024                 if( v4lchroma_to_fourcc[i].i_v4l == p_sys->vid_picture.palette)
1025                 {
1026                     p_sys->i_fourcc = v4lchroma_to_fourcc[i].i_fourcc;
1027                     break;
1028                 }
1029             }
1030         }
1031         else
1032         {
1033             msg_Err( p_demux, "ioctl VIDIOCGPICT failed" );
1034             goto vdev_failed;
1035         }
1036     }
1037
1038     if( p_sys->b_mjpeg )
1039     {
1040         int i;
1041
1042         p_sys->mjpeg_buffers.count = 8;
1043         p_sys->mjpeg_buffers.size = MJPEG_BUFFER_SIZE;
1044
1045         if( ioctl( i_fd, MJPIOC_REQBUFS, &p_sys->mjpeg_buffers ) < 0 )
1046         {
1047             msg_Err( p_demux, "mmap unsupported" );
1048             goto vdev_failed;
1049         }
1050
1051         p_sys->p_video_mmap = mmap( 0,
1052                 p_sys->mjpeg_buffers.size * p_sys->mjpeg_buffers.count,
1053                 PROT_READ | PROT_WRITE, MAP_SHARED, i_fd, 0 );
1054         if( p_sys->p_video_mmap == MAP_FAILED )
1055         {
1056             msg_Err( p_demux, "mmap failed" );
1057             goto vdev_failed;
1058         }
1059
1060         p_sys->i_fourcc  = VLC_CODEC_MJPG;
1061         p_sys->i_frame_pos = -1;
1062
1063         /* queue up all the frames */
1064         for( i = 0; i < (int)p_sys->mjpeg_buffers.count; i++ )
1065         {
1066             if( ioctl( i_fd, MJPIOC_QBUF_CAPT, &i ) < 0 )
1067             {
1068                 msg_Err( p_demux, "unable to queue frame" );
1069                 goto vdev_failed;
1070             }
1071         }
1072     }
1073     else
1074     {
1075         /* Fill in picture_t fields */
1076         if( picture_Setup( &p_sys->pic, p_sys->i_fourcc,
1077                            p_sys->i_width, p_sys->i_height, p_sys->i_width *
1078                            VOUT_ASPECT_FACTOR / p_sys->i_height ) )
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 }