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

   1 /*****************************************************************************
   2  * v4l.c : Video4Linux input module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2002-2004 VideoLAN
   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  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  24  *****************************************************************************/
  25
  26 /*****************************************************************************
  27  * Preamble
  28  *****************************************************************************/
  29 #include <stdlib.h>
  30 #include <stdio.h>
  31 #include <string.h>
  32
  33 #include <vlc/vlc.h>
  34 #include <vlc/input.h>
  35 #include <vlc/vout.h>
  36 #include <codecs.h>
  37
  38 #include <sys/types.h>
  39 #include <sys/stat.h>
  40 #include <sys/ioctl.h>
  41 #include <unistd.h>
  42 #include <sys/mman.h>
  43 #include <errno.h>
  44 #include <fcntl.h>
  45
  46 /* From GStreamer's v4l plugin:
  47  * Because of some really cool feature in video4linux1, also known as
  48  * 'not including sys/types.h and sys/time.h', we had to include it
  49  * ourselves. In all their intelligence, these people decided to fix
  50  * this in the next version (video4linux2) in such a cool way that it
  51  * breaks all compilations of old stuff...
  52  * The real problem is actually that linux/time.h doesn't use proper
  53  * macro checks before defining types like struct timeval. The proper
  54  * fix here is to either fuck the kernel header (which is what we do
  55  * by defining _LINUX_TIME_H, an innocent little hack) or by fixing it
  56  * upstream, which I'll consider doing later on. If you get compiler
  57  * errors here, check your linux/time.h && sys/time.h header setup.
  58 */
  59 #define _LINUX_TIME_H
  60
  61 #include <linux/videodev.h>
  62 #include "videodev_mjpeg.h"
  63
  64 #include <sys/soundcard.h>
  65
  66 /*****************************************************************************
  67  * Module descriptior
  68  *****************************************************************************/
  69 static int  Open ( vlc_object_t * );
  70 static void Close( vlc_object_t * );
  71
  72 #define CACHING_TEXT N_("Caching value in ms")
  73 #define CACHING_LONGTEXT N_( \
  74     "Allows you to modify the default caching value for v4l streams. This " \
  75     "value should be set in millisecond units." )
  76 #define VDEV_TEXT N_("Video device name")
  77 #define VDEV_LONGTEXT N_( \
  78     "Specify the name of the video device that will be used. " \
  79     "If you don't specify anything, no video device will be used.")
  80 #define ADEV_TEXT N_("Audio device name")
  81 #define ADEV_LONGTEXT N_( \
  82     "Specify the name of the audio device that will be used. " \
  83     "If you don't specify anything, no audio 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
  89 vlc_module_begin();
  90     set_shortname( _("Video4Linux") );
  91     set_description( _("Video4Linux input") );
  92
  93     add_integer( "v4l-caching", DEFAULT_PTS_DELAY / 1000, NULL,
  94                  CACHING_TEXT, CACHING_LONGTEXT, VLC_TRUE );
  95     add_string( "v4l-vdev", "/dev/video", 0, VDEV_TEXT, VDEV_LONGTEXT,
  96                 VLC_FALSE );
  97     add_string( "v4l-adev", "/dev/dsp", 0, ADEV_TEXT, ADEV_LONGTEXT,
  98                 VLC_FALSE );
  99     add_string( "v4l-chroma", NULL, NULL, CHROMA_TEXT, CHROMA_LONGTEXT,
 100                 VLC_TRUE );
 101
 102     add_shortcut( "v4l" );
 103     set_capability( "access_demux", 10 );
 104     set_callbacks( Open, Close );
 105 vlc_module_end();
 106
 107 /*****************************************************************************
 108  * Access: local prototypes
 109  *****************************************************************************/
 110 static int Demux  ( demux_t * );
 111 static int Control( demux_t *, int, va_list );
 112
 113 static void ParseMRL    ( demux_t * );
 114 static int  OpenVideoDev( demux_t *, char * );
 115 static int  OpenAudioDev( demux_t *, char * );
 116
 117 static block_t *GrabAudio( demux_t * );
 118 static block_t *GrabVideo( demux_t * );
 119
 120 #define MJPEG_BUFFER_SIZE (256*1024)
 121
 122 struct quicktime_mjpeg_app1
 123 {
 124     uint32_t    i_reserved;             /* set to 0 */
 125     uint32_t    i_tag;                  /* 'mjpg' */
 126     uint32_t    i_field_size;           /* offset following EOI */
 127     uint32_t    i_padded_field_size;    /* offset following EOI+pad */
 128     uint32_t    i_next_field;           /* offset to next field */
 129     uint32_t    i_DQT_offset;
 130     uint32_t    i_DHT_offset;
 131     uint32_t    i_SOF_offset;
 132     uint32_t    i_SOS_offset;
 133     uint32_t    i_data_offset;          /* following SOS marker data */
 134 };
 135
 136 static struct
 137 {
 138     int i_v4l;
 139     int i_fourcc;
 140
 141 } v4lchroma_to_fourcc[] =
 142 {
 143     { VIDEO_PALETTE_GREY, VLC_FOURCC( 'G', 'R', 'E', 'Y' ) },
 144     { VIDEO_PALETTE_HI240, VLC_FOURCC( 'I', '2', '4', '0' ) },
 145     { VIDEO_PALETTE_RGB565, VLC_FOURCC( 'R', 'V', '1', '6' ) },
 146     { VIDEO_PALETTE_RGB555, VLC_FOURCC( 'R', 'V', '1', '5' ) },
 147     { VIDEO_PALETTE_RGB24, VLC_FOURCC( 'R', 'V', '2', '4' ) },
 148     { VIDEO_PALETTE_RGB32, VLC_FOURCC( 'R', 'V', '3', '2' ) },
 149     { VIDEO_PALETTE_YUV422, VLC_FOURCC( 'I', '4', '2', '2' ) },
 150     { VIDEO_PALETTE_YUYV, VLC_FOURCC( 'Y', 'U', 'Y', 'V' ) },
 151     { VIDEO_PALETTE_UYVY, VLC_FOURCC( 'U', 'Y', 'V', 'Y' ) },
 152     { VIDEO_PALETTE_YUV420, VLC_FOURCC( 'I', '4', '2', 'N' ) },
 153     { VIDEO_PALETTE_YUV411, VLC_FOURCC( 'I', '4', '1', 'N' ) },
 154     { VIDEO_PALETTE_RAW, VLC_FOURCC( 'G', 'R', 'A', 'W' ) },
 155     { VIDEO_PALETTE_YUV422P, VLC_FOURCC( 'I', '4', '2', '2' ) },
 156     { VIDEO_PALETTE_YUV420P, VLC_FOURCC( 'I', '4', '2', '0' ) },
 157     { VIDEO_PALETTE_YUV411P, VLC_FOURCC( 'I', '4', '1', '1' ) },
 158     { 0, 0 }
 159 };
 160
 161 struct demux_sys_t
 162 {
 163     /* Devices */
 164     char *psz_device;         /* Main device from MRL, can be video or audio */
 165
 166     char *psz_vdev;
 167     int  fd_video;
 168
 169     char *psz_adev;
 170     int  fd_audio;
 171
 172     /* Video properties */
 173     picture_t pic;
 174
 175     int i_fourcc;
 176     int i_channel;
 177     int i_audio;
 178     int i_norm;
 179     int i_tuner;
 180     int i_frequency;
 181     int i_width;
 182     int i_height;
 183
 184     int i_brightness;
 185     int i_hue;
 186     int i_colour;
 187     int i_contrast;
 188
 189     float f_fps;            /* <= 0.0 mean to grab at full rate */
 190     mtime_t i_video_pts;    /* only used when f_fps > 0 */
 191
 192     vlc_bool_t b_mjpeg;
 193     int i_decimation;
 194     int i_quality;
 195
 196     struct video_capability vid_cap;
 197     struct video_mbuf       vid_mbuf;
 198     struct mjpeg_requestbuffers mjpeg_buffers;
 199
 200     uint8_t *p_video_mmap;
 201     int     i_frame_pos;
 202
 203     struct video_mmap   vid_mmap;
 204     struct video_picture vid_picture;
 205
 206     int          i_video_frame_size;
 207     es_out_id_t  *p_es_video;
 208
 209     /* Audio properties */
 210     vlc_fourcc_t i_acodec_raw;
 211     int          i_sample_rate;
 212     vlc_bool_t   b_stereo;
 213     int          i_audio_max_frame_size;
 214     block_t      *p_block_audio;
 215     es_out_id_t  *p_es_audio;
 216 };
 217
 218 /*****************************************************************************
 219  * Open: opens v4l device
 220  *****************************************************************************
 221  *
 222  * url: <video device>::::
 223  *
 224  *****************************************************************************/
 225 static int Open( vlc_object_t *p_this )
 226 {
 227     demux_t     *p_demux = (demux_t*)p_this;
 228     demux_sys_t *p_sys;
 229
 230     /* Only when selected */
 231     if( *p_demux->psz_access == '\0' )
 232         return VLC_EGENERIC;
 233
 234     /* Set up p_demux */
 235     p_demux->pf_demux = Demux;
 236     p_demux->pf_control = Control;
 237     p_demux->info.i_update = 0;
 238     p_demux->info.i_title = 0;
 239     p_demux->info.i_seekpoint = 0;
 240     p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
 241     memset( p_sys, 0, sizeof( demux_sys_t ) );
 242
 243     p_sys->i_audio          = -1;
 244     p_sys->i_norm           = VIDEO_MODE_AUTO;    // auto
 245     p_sys->i_tuner          = -1;
 246     p_sys->i_frequency      = -1;
 247
 248     p_sys->f_fps            = -1.0;
 249     p_sys->i_video_pts      = -1;
 250
 251     p_sys->i_brightness     = -1;
 252     p_sys->i_hue            = -1;
 253     p_sys->i_colour         = -1;
 254     p_sys->i_contrast       = -1;
 255
 256     p_sys->b_mjpeg     = VLC_FALSE;
 257     p_sys->i_decimation = 1;
 258     p_sys->i_quality = 100;
 259
 260     p_sys->i_sample_rate  = 44100;
 261     p_sys->b_stereo       = VLC_TRUE;
 262
 263     p_sys->psz_device = p_sys->psz_vdev = p_sys->psz_adev = NULL;
 264     p_sys->fd_video = -1;
 265     p_sys->fd_audio = -1;
 266
 267     p_sys->p_es_video = p_sys->p_es_audio = 0;
 268     p_sys->p_block_audio = 0;
 269
 270     ParseMRL( p_demux );
 271
 272     /* Find main device (video or audio) */
 273     if( p_sys->psz_device && *p_sys->psz_device )
 274     {
 275         msg_Dbg( p_demux, "main device=`%s'", p_sys->psz_device );
 276
 277         /* Try to open as video device */
 278         p_sys->fd_video = OpenVideoDev( p_demux, p_sys->psz_device );
 279
 280         if( p_sys->fd_video < 0 )
 281         {
 282             /* Try to open as audio device */
 283             p_sys->fd_audio = OpenAudioDev( p_demux, p_sys->psz_device );
 284             if( p_sys->fd_audio >= 0 )
 285             {
 286                 if( p_sys->psz_adev ) free( p_sys->psz_adev );
 287                 p_sys->psz_adev = p_sys->psz_device;
 288                 p_sys->psz_device = NULL;
 289             }
 290         }
 291         else
 292         {
 293             if( p_sys->psz_vdev ) free( p_sys->psz_vdev );
 294             p_sys->psz_vdev = p_sys->psz_device;
 295             p_sys->psz_device = NULL;
 296         }
 297     }
 298
 299     /* If no device opened, only continue if the access was forced */
 300     if( p_sys->fd_video < 0 && p_sys->fd_audio < 0 )
 301     {
 302         if( strcmp( p_demux->psz_access, "v4l" ) )
 303         {
 304             Close( p_this );
 305             return VLC_EGENERIC;
 306         }
 307     }
 308
 309     /* Find video device */
 310     if( p_sys->fd_video < 0 )
 311     {
 312         if( !p_sys->psz_vdev || !*p_sys->psz_vdev )
 313         {
 314             if( p_sys->psz_vdev ) free( p_sys->psz_vdev );
 315             p_sys->psz_vdev = var_CreateGetString( p_demux, "v4l-vdev" );;
 316         }
 317
 318         if( p_sys->psz_vdev && *p_sys->psz_vdev )
 319         {
 320             p_sys->fd_video = OpenVideoDev( p_demux, p_sys->psz_vdev );
 321         }
 322     }
 323
 324     /* Find audio device */
 325     if( p_sys->fd_audio < 0 )
 326     {
 327         if( !p_sys->psz_adev || !*p_sys->psz_adev )
 328         {
 329             if( p_sys->psz_adev ) free( p_sys->psz_adev );
 330             p_sys->psz_adev = var_CreateGetString( p_demux, "v4l-adev" );;
 331         }
 332
 333         if( p_sys->psz_adev && *p_sys->psz_adev )
 334         {
 335             p_sys->fd_audio = OpenAudioDev( p_demux, p_sys->psz_adev );
 336         }
 337     }
 338
 339     if( p_sys->fd_video < 0 && p_sys->fd_audio < 0 )
 340     {
 341         Close( p_this );
 342         return VLC_EGENERIC;
 343     }
 344
 345     msg_Dbg( p_demux, "v4l grabbing started" );
 346
 347     /* Declare elementary streams */
 348     if( p_sys->fd_video >= 0 )
 349     {
 350         es_format_t fmt;
 351         es_format_Init( &fmt, VIDEO_ES, p_sys->i_fourcc );
 352         fmt.video.i_width  = p_sys->i_width;
 353         fmt.video.i_height = p_sys->i_height;
 354         fmt.video.i_aspect = 4 * VOUT_ASPECT_FACTOR / 3;
 355
 356         /* Setup rgb mask for RGB formats */
 357         if( p_sys->i_fourcc == VLC_FOURCC('R','V','2','4') )
 358         {
 359             /* This is in BGR format */
 360             fmt.video.i_bmask = 0x00ff0000;
 361             fmt.video.i_gmask = 0x0000ff00;
 362             fmt.video.i_rmask = 0x000000ff;
 363         }
 364
 365         msg_Dbg( p_demux, "added new video es %4.4s %dx%d",
 366                  (char*)&fmt.i_codec, fmt.video.i_width, fmt.video.i_height );
 367         p_sys->p_es_video = es_out_Add( p_demux->out, &fmt );
 368     }
 369
 370     if( p_sys->fd_audio >= 0 )
 371     {
 372         es_format_t fmt;
 373         es_format_Init( &fmt, AUDIO_ES, VLC_FOURCC('a','r','a','w') );
 374
 375         fmt.audio.i_channels = p_sys->b_stereo ? 2 : 1;
 376         fmt.audio.i_rate = p_sys->i_sample_rate;
 377         fmt.audio.i_bitspersample = 16; // FIXME ?
 378         fmt.audio.i_blockalign = fmt.audio.i_channels *
 379             fmt.audio.i_bitspersample / 8;
 380         fmt.i_bitrate = fmt.audio.i_channels * fmt.audio.i_rate *
 381             fmt.audio.i_bitspersample;
 382
 383         msg_Dbg( p_demux, "new audio es %d channels %dHz",
 384                  fmt.audio.i_channels, fmt.audio.i_rate );
 385
 386         p_sys->p_es_audio = es_out_Add( p_demux->out, &fmt );
 387     }
 388
 389     /* Update default_pts to a suitable value for access */
 390     var_Create( p_demux, "v4l-caching", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 391
 392     return VLC_SUCCESS;
 393 }
 394
 395 /*****************************************************************************
 396  * Close: close device, free resources
 397  *****************************************************************************/
 398 static void Close( vlc_object_t *p_this )
 399 {
 400     demux_t     *p_demux = (demux_t *)p_this;
 401     demux_sys_t *p_sys   = p_demux->p_sys;
 402
 403     if( p_sys->psz_device ) free( p_sys->psz_device );
 404     if( p_sys->psz_vdev )   free( p_sys->psz_vdev );
 405     if( p_sys->psz_adev )   free( p_sys->psz_adev );
 406     if( p_sys->fd_video >= 0 ) close( p_sys->fd_video );
 407     if( p_sys->fd_audio >= 0 ) close( p_sys->fd_audio );
 408     if( p_sys->p_block_audio ) block_Release( p_sys->p_block_audio );
 409
 410     if( p_sys->b_mjpeg )
 411     {
 412         int i_noframe = -1;
 413         ioctl( p_sys->fd_video, MJPIOC_QBUF_CAPT, &i_noframe );
 414     }
 415
 416     if( p_sys->p_video_mmap && p_sys->p_video_mmap != MAP_FAILED )
 417     {
 418         if( p_sys->b_mjpeg )
 419             munmap( p_sys->p_video_mmap, p_sys->mjpeg_buffers.size *
 420                     p_sys->mjpeg_buffers.count );
 421         else
 422             munmap( p_sys->p_video_mmap, p_sys->vid_mbuf.size );
 423     }
 424
 425     free( p_sys );
 426 }
 427
 428 /*****************************************************************************
 429  * Control:
 430  *****************************************************************************/
 431 static int Control( demux_t *p_demux, int i_query, va_list args )
 432 {
 433     vlc_bool_t *pb;
 434     int64_t    *pi64;
 435
 436     switch( i_query )
 437     {
 438         /* Special for access_demux */
 439         case DEMUX_CAN_PAUSE:
 440         case DEMUX_SET_PAUSE_STATE:
 441         case DEMUX_CAN_CONTROL_PACE:
 442             pb = (vlc_bool_t*)va_arg( args, vlc_bool_t * );
 443             *pb = VLC_FALSE;
 444             return VLC_SUCCESS;
 445
 446         case DEMUX_GET_PTS_DELAY:
 447             pi64 = (int64_t*)va_arg( args, int64_t * );
 448             *pi64 = (int64_t)var_GetInteger( p_demux, "v4l-caching" ) * 1000;
 449             return VLC_SUCCESS;
 450
 451         case DEMUX_GET_TIME:
 452             pi64 = (int64_t*)va_arg( args, int64_t * );
 453             *pi64 = mdate();
 454             return VLC_SUCCESS;
 455
 456         /* TODO implement others */
 457         default:
 458             return VLC_EGENERIC;
 459     }
 460
 461     return VLC_EGENERIC;
 462 }
 463
 464 /*****************************************************************************
 465  * Demux:
 466  *****************************************************************************/
 467 static int Demux( demux_t *p_demux )
 468 {
 469     demux_sys_t *p_sys = p_demux->p_sys;
 470     es_out_id_t  *p_es = p_sys->p_es_audio;
 471     block_t *p_block = NULL;
 472
 473     /* Try grabbing audio frames first */
 474     if( p_sys->fd_audio < 0 || !( p_block = GrabAudio( p_demux ) ) )
 475     {
 476         /* Try grabbing video frame */
 477         p_es = p_sys->p_es_video;
 478         if( p_sys->fd_video > 0 ) p_block = GrabVideo( p_demux );
 479     }
 480
 481     if( !p_block )
 482     {
 483         /* Sleep so we do not consume all the cpu, 10ms seems
 484          * like a good value (100fps) */
 485         msleep( 10000 );
 486         return 1;
 487     }
 488
 489     es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
 490     es_out_Send( p_demux->out, p_es, p_block );
 491
 492     return 1;
 493 }
 494
 495 /*****************************************************************************
 496  * ParseMRL: parse the options contained in the MRL
 497  *****************************************************************************/
 498 static void ParseMRL( demux_t *p_demux )
 499 {
 500     demux_sys_t *p_sys = p_demux->p_sys;
 501
 502     char *psz_dup = strdup( p_demux->psz_path );
 503     char *psz_parser = psz_dup;
 504
 505     while( *psz_parser && *psz_parser != ':' )
 506     {
 507         psz_parser++;
 508     }
 509
 510     if( *psz_parser == ':' )
 511     {
 512         /* read options */
 513         for( ;; )
 514         {
 515             *psz_parser++ = '\0';
 516             if( !strncmp( psz_parser, "channel=", strlen( "channel=" ) ) )
 517             {
 518                 p_sys->i_channel = strtol( psz_parser + strlen( "channel=" ),
 519                                            &psz_parser, 0 );
 520             }
 521             else if( !strncmp( psz_parser, "norm=", strlen( "norm=" ) ) )
 522             {
 523                 psz_parser += strlen( "norm=" );
 524                 if( !strncmp( psz_parser, "pal", strlen( "pal" ) ) )
 525                 {
 526                     p_sys->i_norm = VIDEO_MODE_PAL;
 527                     psz_parser += strlen( "pal" );
 528                 }
 529                 else if( !strncmp( psz_parser, "ntsc", strlen( "ntsc" ) ) )
 530                 {
 531                     p_sys->i_norm = VIDEO_MODE_NTSC;
 532                     psz_parser += strlen( "ntsc" );
 533                 }
 534                 else if( !strncmp( psz_parser, "secam", strlen( "secam" ) ) )
 535                 {
 536                     p_sys->i_norm = VIDEO_MODE_SECAM;
 537                     psz_parser += strlen( "secam" );
 538                 }
 539                 else if( !strncmp( psz_parser, "auto", strlen( "auto" ) ) )
 540                 {
 541                     p_sys->i_norm = VIDEO_MODE_AUTO;
 542                     psz_parser += strlen( "auto" );
 543                 }
 544                 else
 545                 {
 546                     p_sys->i_norm = strtol( psz_parser, &psz_parser, 0 );
 547                 }
 548             }
 549             else if( !strncmp( psz_parser, "frequency=",
 550                                strlen( "frequency=" ) ) )
 551             {
 552                 p_sys->i_frequency =
 553                     strtol( psz_parser + strlen( "frequency=" ),
 554                             &psz_parser, 0 );
 555                 if( p_sys->i_frequency < 30000 )
 556                 {
 557                     msg_Warn( p_demux, "v4l syntax has changed : "
 558                               "'frequency' is now channel frequency in kHz");
 559                 }
 560             }
 561             else if( !strncmp( psz_parser, "audio=", strlen( "audio=" ) ) )
 562             {
 563                 p_sys->i_audio = strtol( psz_parser + strlen( "audio=" ),
 564                                          &psz_parser, 0 );
 565             }
 566             else if( !strncmp( psz_parser, "size=", strlen( "size=" ) ) )
 567             {
 568                 psz_parser += strlen( "size=" );
 569                 if( !strncmp( psz_parser, "subqcif", strlen( "subqcif" ) ) )
 570                 {
 571                     p_sys->i_width  = 128;
 572                     p_sys->i_height = 96;
 573                 }
 574                 else if( !strncmp( psz_parser, "qsif", strlen( "qsif" ) ) )
 575                 {
 576                     p_sys->i_width  = 160;
 577                     p_sys->i_height = 120;
 578                 }
 579                 else if( !strncmp( psz_parser, "qcif", strlen( "qcif" ) ) )
 580                 {
 581                     p_sys->i_width  = 176;
 582                     p_sys->i_height = 144;
 583                 }
 584                 else if( !strncmp( psz_parser, "sif", strlen( "sif" ) ) )
 585                 {
 586                     p_sys->i_width  = 320;
 587                     p_sys->i_height = 244;
 588                 }
 589                 else if( !strncmp( psz_parser, "cif", strlen( "cif" ) ) )
 590                 {
 591                     p_sys->i_width  = 352;
 592                     p_sys->i_height = 288;
 593                 }
 594                 else if( !strncmp( psz_parser, "vga", strlen( "vga" ) ) )
 595                 {
 596                     p_sys->i_width  = 640;
 597                     p_sys->i_height = 480;
 598                 }
 599                 else
 600                 {
 601                     /* widthxheight */
 602                     p_sys->i_width = strtol( psz_parser, &psz_parser, 0 );
 603                     if( *psz_parser == 'x' || *psz_parser == 'X')
 604                     {
 605                         p_sys->i_height = strtol( psz_parser + 1,
 606                                                   &psz_parser, 0 );
 607                     }
 608                     msg_Dbg( p_demux, "WxH %dx%d", p_sys->i_width,
 609                              p_sys->i_height );
 610                 }
 611             }
 612             else if( !strncmp( psz_parser, "brightness=", strlen( "brightness=" ) ) )
 613             {
 614                 p_sys->i_brightness = strtol( psz_parser + strlen( "brightness=" ),
 615                                               &psz_parser, 0 );
 616             }
 617             else if( !strncmp( psz_parser, "colour=", strlen( "colour=" ) ) )
 618             {
 619                 p_sys->i_colour = strtol( psz_parser + strlen( "colour=" ),
 620                                           &psz_parser, 0 );
 621             }
 622             else if( !strncmp( psz_parser, "hue=", strlen( "hue=" ) ) )
 623             {
 624                 p_sys->i_hue = strtol( psz_parser + strlen( "hue=" ),
 625                                        &psz_parser, 0 );
 626             }
 627             else if( !strncmp( psz_parser, "contrast=", strlen( "contrast=" ) ) )
 628             {
 629                 p_sys->i_contrast = strtol( psz_parser + strlen( "contrast=" ),
 630                                             &psz_parser, 0 );
 631             }
 632             else if( !strncmp( psz_parser, "tuner=", strlen( "tuner=" ) ) )
 633             {
 634                 p_sys->i_tuner = strtol( psz_parser + strlen( "tuner=" ),
 635                                          &psz_parser, 0 );
 636             }
 637             else if( !strncmp( psz_parser, "adev=", strlen( "adev=" ) ) )
 638             {
 639                 int  i_len;
 640
 641                 psz_parser += strlen( "adev=" );
 642                 if( strchr( psz_parser, ':' ) )
 643                 {
 644                     i_len = strchr( psz_parser, ':' ) - psz_parser;
 645                 }
 646                 else
 647                 {
 648                     i_len = strlen( psz_parser );
 649                 }
 650
 651                 p_sys->psz_adev = strndup( psz_parser, i_len );
 652
 653                 psz_parser += i_len;
 654             }
 655             else if( !strncmp( psz_parser, "samplerate=",
 656                                strlen( "samplerate=" ) ) )
 657             {
 658                 p_sys->i_sample_rate =
 659                     strtol( psz_parser + strlen( "samplerate=" ),
 660                             &psz_parser, 0 );
 661             }
 662             else if( !strncmp( psz_parser, "stereo", strlen( "stereo" ) ) )
 663             {
 664                 psz_parser += strlen( "stereo" );
 665
 666                 p_sys->b_stereo = VLC_TRUE;
 667             }
 668             else if( !strncmp( psz_parser, "mono", strlen( "mono" ) ) )
 669             {
 670                 psz_parser += strlen( "mono" );
 671
 672                 p_sys->b_stereo = VLC_FALSE;
 673             }
 674             else if( !strncmp( psz_parser, "mjpeg", strlen( "mjpeg" ) ) )
 675             {
 676                 psz_parser += strlen( "mjpeg" );
 677
 678                 p_sys->b_mjpeg = VLC_TRUE;
 679             }
 680             else if( !strncmp( psz_parser, "decimation=",
 681                         strlen( "decimation=" ) ) )
 682             {
 683                 p_sys->i_decimation =
 684                     strtol( psz_parser + strlen( "decimation=" ),
 685                             &psz_parser, 0 );
 686             }
 687             else if( !strncmp( psz_parser, "quality=",
 688                         strlen( "quality=" ) ) )
 689             {
 690                 p_sys->i_quality =
 691                     strtol( psz_parser + strlen( "quality=" ),
 692                             &psz_parser, 0 );
 693             }
 694             else if( !strncmp( psz_parser, "fps=", strlen( "fps=" ) ) )
 695             {
 696                 p_sys->f_fps = strtof( psz_parser + strlen( "fps=" ),
 697                                        &psz_parser );
 698             }
 699             else
 700             {
 701                 msg_Warn( p_demux, "unknown option" );
 702             }
 703
 704             while( *psz_parser && *psz_parser != ':' )
 705             {
 706                 psz_parser++;
 707             }
 708
 709             if( *psz_parser == '\0' )
 710             {
 711                 break;
 712             }
 713         }
 714     }
 715
 716     if( *psz_dup )
 717     {
 718         p_sys->psz_device = strdup( psz_dup );
 719     }
 720     if( psz_dup ) free( psz_dup );
 721 }
 722
 723 /*****************************************************************************
 724  * OpenVideoDev:
 725  *****************************************************************************/
 726 static int OpenVideoDev( demux_t *p_demux, char *psz_device )
 727 {
 728     demux_sys_t *p_sys = p_demux->p_sys;
 729     int i_fd;
 730
 731     struct video_channel vid_channel;
 732     struct mjpeg_params mjpeg;
 733     int i;
 734
 735     if( ( i_fd = open( psz_device, O_RDWR ) ) < 0 )
 736     {
 737         msg_Err( p_demux, "cannot open device (%s)", strerror( errno ) );
 738         goto vdev_failed;
 739     }
 740
 741     if( ioctl( i_fd, VIDIOCGCAP, &p_sys->vid_cap ) < 0 )
 742     {
 743         msg_Err( p_demux, "cannot get capabilities (%s)", strerror( errno ) );
 744         goto vdev_failed;
 745     }
 746
 747     msg_Dbg( p_demux,
 748              "V4L device %s %d channels %d audios %d < w < %d %d < h < %d",
 749              p_sys->vid_cap.name,
 750              p_sys->vid_cap.channels,
 751              p_sys->vid_cap.audios,
 752              p_sys->vid_cap.minwidth,  p_sys->vid_cap.maxwidth,
 753              p_sys->vid_cap.minheight, p_sys->vid_cap.maxheight );
 754
 755     if( p_sys->i_channel < 0 || p_sys->i_channel >= p_sys->vid_cap.channels )
 756     {
 757         msg_Dbg( p_demux, "invalid channel, falling back on channel 0" );
 758         p_sys->i_channel = 0;
 759     }
 760     if( p_sys->i_audio >= p_sys->vid_cap.audios )
 761     {
 762         msg_Dbg( p_demux, "invalid audio, falling back with no audio" );
 763         p_sys->i_audio = -1;
 764     }
 765
 766     if( p_sys->i_width < p_sys->vid_cap.minwidth ||
 767         p_sys->i_width > p_sys->vid_cap.maxwidth )
 768     {
 769         msg_Dbg( p_demux, "invalid width %i", p_sys->i_width );
 770         p_sys->i_width = 0;
 771     }
 772     if( p_sys->i_height < p_sys->vid_cap.minheight ||
 773         p_sys->i_height > p_sys->vid_cap.maxheight )
 774     {
 775         msg_Dbg( p_demux, "invalid height %i", p_sys->i_height );
 776         p_sys->i_height = 0;
 777     }
 778
 779     if( !( p_sys->vid_cap.type & VID_TYPE_CAPTURE ) )
 780     {
 781         msg_Err( p_demux, "cannot grab" );
 782         goto vdev_failed;
 783     }
 784
 785     vid_channel.channel = p_sys->i_channel;
 786     if( ioctl( i_fd, VIDIOCGCHAN, &vid_channel ) < 0 )
 787     {
 788         msg_Err( p_demux, "cannot get channel infos (%s)",
 789                           strerror( errno ) );
 790         goto vdev_failed;
 791     }
 792     msg_Dbg( p_demux,
 793              "setting channel %s(%d) %d tuners flags=0x%x type=0x%x norm=0x%x",
 794              vid_channel.name, vid_channel.channel, vid_channel.tuners,
 795              vid_channel.flags, vid_channel.type, vid_channel.norm );
 796
 797     if( p_sys->i_tuner >= vid_channel.tuners )
 798     {
 799         msg_Dbg( p_demux, "invalid tuner, falling back on tuner 0" );
 800         p_sys->i_tuner = 0;
 801     }
 802
 803     vid_channel.norm = p_sys->i_norm;
 804     if( ioctl( i_fd, VIDIOCSCHAN, &vid_channel ) < 0 )
 805     {
 806         msg_Err( p_demux, "cannot set channel (%s)", strerror( errno ) );
 807         goto vdev_failed;
 808     }
 809
 810     if( vid_channel.flags & VIDEO_VC_TUNER )
 811     {
 812
 813         /* set tuner */
 814 #if 0
 815         struct video_tuner vid_tuner;
 816         if( p_sys->i_tuner >= 0 )
 817         {
 818             vid_tuner.tuner = p_sys->i_tuner;
 819             if( ioctl( i_fd, VIDIOCGTUNER, &vid_tuner ) < 0 )
 820             {
 821                 msg_Err( p_demux, "cannot get tuner (%s)", strerror( errno ) );
 822                 goto vdev_failed;
 823             }
 824             msg_Dbg( p_demux, "tuner %s low=%d high=%d, flags=0x%x "
 825                      "mode=0x%x signal=0x%x",
 826                      vid_tuner.name, vid_tuner.rangelow, vid_tuner.rangehigh,
 827                      vid_tuner.flags, vid_tuner.mode, vid_tuner.signal );
 828
 829             msg_Dbg( p_demux, "setting tuner %s (%d)",
 830                      vid_tuner.name, vid_tuner.tuner );
 831
 832             /* FIXME FIXME to be checked FIXME FIXME */
 833             //vid_tuner.mode = p_sys->i_norm;
 834             if( ioctl( i_fd, VIDIOCSTUNER, &vid_tuner ) < 0 )
 835             {
 836                 msg_Err( p_demux, "cannot set tuner (%s)", strerror( errno ) );
 837                 goto vdev_failed;
 838             }
 839         }
 840 #endif
 841
 842         /* Show a warning if frequency is < than 30000.
 843          * User is certainly usint old syntax. */
 844
 845
 846         /* set frequency */
 847         if( p_sys->i_frequency >= 0 )
 848         {
 849             int driver_frequency = p_sys->i_frequency * 16 /1000;
 850             if( ioctl( i_fd, VIDIOCSFREQ, &driver_frequency ) < 0 )
 851             {
 852                 msg_Err( p_demux, "cannot set frequency (%s)",
 853                                   strerror( errno ) );
 854                 goto vdev_failed;
 855             }
 856             msg_Dbg( p_demux, "frequency %d (%d)", p_sys->i_frequency,
 857                                                    driver_frequency );
 858         }
 859     }
 860
 861     /* set audio */
 862     if( vid_channel.flags & VIDEO_VC_AUDIO )
 863     {
 864         struct video_audio      vid_audio;
 865
 866         /* XXX TODO volume, balance, ... */
 867         if( p_sys->i_audio >= 0 )
 868         {
 869             vid_audio.audio = p_sys->i_audio;
 870             if( ioctl( i_fd, VIDIOCGAUDIO, &vid_audio ) < 0 )
 871             {
 872                 msg_Err( p_demux, "cannot get audio (%s)", strerror( errno ) );
 873                 goto vdev_failed;
 874             }
 875
 876             /* unmute audio */
 877             vid_audio.flags &= ~VIDEO_AUDIO_MUTE;
 878
 879             if( ioctl( i_fd, VIDIOCSAUDIO, &vid_audio ) < 0 )
 880             {
 881                 msg_Err( p_demux, "cannot set audio (%s)", strerror( errno ) );
 882                 goto vdev_failed;
 883             }
 884         }
 885
 886     }
 887
 888     /* establish basic params with input and norm before feeling width
 889      * or height */
 890     if( p_sys->b_mjpeg )
 891     {
 892         struct quicktime_mjpeg_app1 *p_app1;
 893         int32_t i_offset;
 894
 895         if( ioctl( i_fd, MJPIOC_G_PARAMS, &mjpeg ) < 0 )
 896         {
 897             msg_Err( p_demux, "cannot get mjpeg params (%s)",
 898                               strerror( errno ) );
 899             goto vdev_failed;
 900         }
 901         mjpeg.input = p_sys->i_channel;
 902         mjpeg.norm  = p_sys->i_norm;
 903         mjpeg.decimation = p_sys->i_decimation;
 904
 905         if( p_sys->i_width )
 906             mjpeg.img_width = p_sys->i_width / p_sys->i_decimation;
 907         if( p_sys->i_height )
 908             mjpeg.img_height = p_sys->i_height / p_sys->i_decimation;
 909
 910         /* establish Quicktime APP1 marker while we are here */
 911         mjpeg.APPn = 1;
 912         mjpeg.APP_len = 40;
 913
 914         /* aligned */
 915         p_app1 = (struct quicktime_mjpeg_app1 *)mjpeg.APP_data;
 916         p_app1->i_reserved = 0;
 917         p_app1->i_tag = VLC_FOURCC( 'm','j','p','g' );
 918         p_app1->i_field_size = 0;
 919         p_app1->i_padded_field_size = 0;
 920         p_app1->i_next_field = 0;
 921         /* XXX WARNING XXX */
 922         /* these's nothing magic about these values.  We are dangerously
 923          * assuming the encoder card is encoding mjpeg-a and is not throwing
 924          * in marker tags we aren't expecting.  It's bad enough we have to
 925          * search through the jpeg output for every frame we grab just to
 926          * find the first field's end marker, so we take this risk to boost
 927          * performance.
 928          * This is really something the driver could do for us because this
 929          * does conform to standards outside of Apple Quicktime.
 930          */
 931         i_offset = 0x2e;
 932         p_app1->i_DQT_offset = hton32( i_offset );
 933         i_offset = 0xb4;
 934         p_app1->i_DHT_offset = hton32( i_offset );
 935         i_offset = 0x258;
 936         p_app1->i_SOF_offset = hton32( i_offset );
 937         i_offset = 0x26b;
 938         p_app1->i_SOS_offset = hton32( i_offset );
 939         i_offset = 0x279;
 940         p_app1->i_data_offset = hton32( i_offset );
 941
 942         /* SOF and SOS aren't specified by the mjpeg API because they aren't
 943          * optional.  They will be present in the output. */
 944         mjpeg.jpeg_markers = JPEG_MARKER_DHT | JPEG_MARKER_DQT;
 945
 946         if( ioctl( i_fd, MJPIOC_S_PARAMS, &mjpeg ) < 0 )
 947         {
 948             msg_Err( p_demux, "cannot set mjpeg params (%s)",
 949                               strerror( errno ) );
 950             goto vdev_failed;
 951         }
 952
 953         p_sys->i_width = mjpeg.img_width * mjpeg.HorDcm;
 954         p_sys->i_height = mjpeg.img_height * mjpeg.VerDcm *
 955             mjpeg.field_per_buff;
 956     }
 957
 958     /* fix width/height */
 959     if( !p_sys->b_mjpeg && ( p_sys->i_width == 0 || p_sys->i_height == 0 ) )
 960     {
 961         struct video_window vid_win;
 962
 963         if( ioctl( i_fd, VIDIOCGWIN, &vid_win ) < 0 )
 964         {
 965             msg_Err( p_demux, "cannot get win (%s)", strerror( errno ) );
 966             goto vdev_failed;
 967         }
 968         p_sys->i_width  = vid_win.width;
 969         p_sys->i_height = vid_win.height;
 970
 971         msg_Dbg( p_demux, "will use %dx%d", p_sys->i_width, p_sys->i_height );
 972     }
 973
 974     if( !p_sys->b_mjpeg )
 975     {
 976         /* set hue/color/.. */
 977         if( ioctl( i_fd, VIDIOCGPICT, &p_sys->vid_picture ) == 0 )
 978         {
 979             struct video_picture vid_picture = p_sys->vid_picture;
 980
 981             if( p_sys->i_brightness >= 0 && p_sys->i_brightness < 65536 )
 982             {
 983                 vid_picture.brightness = p_sys->i_brightness;
 984             }
 985             if( p_sys->i_colour >= 0 && p_sys->i_colour < 65536 )
 986             {
 987                 vid_picture.colour = p_sys->i_colour;
 988             }
 989             if( p_sys->i_hue >= 0 && p_sys->i_hue < 65536 )
 990             {
 991                 vid_picture.hue = p_sys->i_hue;
 992             }
 993             if( p_sys->i_contrast  >= 0 && p_sys->i_contrast < 65536 )
 994             {
 995                 vid_picture.contrast = p_sys->i_contrast;
 996             }
 997             if( ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
 998             {
 999                 msg_Dbg( p_demux, "v4l device uses brightness: %d",
1000                          vid_picture.brightness );
1001                 msg_Dbg( p_demux, "v4l device uses colour: %d",
1002                          vid_picture.colour );
1003                 msg_Dbg( p_demux, "v4l device uses hue: %d", vid_picture.hue );
1004                 msg_Dbg( p_demux, "v4l device uses contrast: %d",
1005                          vid_picture.contrast );
1006                 p_sys->vid_picture = vid_picture;
1007             }
1008         }
1009
1010         /* Find out video format used by device */
1011         if( ioctl( i_fd, VIDIOCGPICT, &p_sys->vid_picture ) == 0 )
1012         {
1013             struct video_picture vid_picture = p_sys->vid_picture;
1014             char *psz;
1015             int i;
1016
1017             vid_picture.palette = 0;
1018             p_sys->i_fourcc = 0;
1019
1020             psz = var_CreateGetString( p_demux, "v4l-chroma" );
1021             if( strlen( psz ) >= 4 )
1022             {
1023                 int i_chroma = VLC_FOURCC( psz[0], psz[1], psz[2], psz[3] );
1024
1025                 /* Find out v4l chroma code */
1026                 for( i = 0; v4lchroma_to_fourcc[i].i_v4l != 0; i++ )
1027                 {
1028                     if( v4lchroma_to_fourcc[i].i_fourcc == i_chroma )
1029                     {
1030                         vid_picture.palette = v4lchroma_to_fourcc[i].i_v4l;
1031                         break;
1032                     }
1033                 }
1034             }
1035             free( psz );
1036
1037             if( vid_picture.palette &&
1038                 !ioctl( i_fd, VIDIOCSPICT, &vid_picture ) )
1039             {
1040                 p_sys->vid_picture = vid_picture;
1041             }
1042             else
1043             {
1044                 /* Try to set the format to something easy to encode */
1045                 vid_picture.palette = VIDEO_PALETTE_YUV420P;
1046                 if( ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
1047                 {
1048                     p_sys->vid_picture = vid_picture;
1049                 }
1050                 else
1051                 {
1052                     vid_picture.palette = VIDEO_PALETTE_YUV422P;
1053                     if( ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
1054                     {
1055                         p_sys->vid_picture = vid_picture;
1056                     }
1057                 }
1058             }
1059
1060             /* Find out final format */
1061             for( i = 0; v4lchroma_to_fourcc[i].i_v4l != 0; i++ )
1062             {
1063                 if( v4lchroma_to_fourcc[i].i_v4l == p_sys->vid_picture.palette)
1064                 {
1065                     p_sys->i_fourcc = v4lchroma_to_fourcc[i].i_fourcc;
1066                     break;
1067                 }
1068             }
1069         }
1070         else
1071         {
1072             msg_Err( p_demux, "ioctl VIDIOCGPICT failed" );
1073             goto vdev_failed;
1074         }
1075     }
1076
1077     if( p_sys->b_mjpeg )
1078     {
1079         int i;
1080
1081         p_sys->mjpeg_buffers.count = 8;
1082         p_sys->mjpeg_buffers.size = MJPEG_BUFFER_SIZE;
1083
1084         if( ioctl( i_fd, MJPIOC_REQBUFS, &p_sys->mjpeg_buffers ) < 0 )
1085         {
1086             msg_Err( p_demux, "mmap unsupported" );
1087             goto vdev_failed;
1088         }
1089
1090         p_sys->p_video_mmap = mmap( 0,
1091                 p_sys->mjpeg_buffers.size * p_sys->mjpeg_buffers.count,
1092                 PROT_READ | PROT_WRITE, MAP_SHARED, i_fd, 0 );
1093         if( p_sys->p_video_mmap == MAP_FAILED )
1094         {
1095             msg_Err( p_demux, "mmap failed" );
1096             goto vdev_failed;
1097         }
1098
1099         p_sys->i_fourcc  = VLC_FOURCC( 'm','j','p','g' );
1100         p_sys->i_frame_pos = -1;
1101
1102         /* queue up all the frames */
1103         for( i = 0; i < (int)p_sys->mjpeg_buffers.count; i++ )
1104         {
1105             if( ioctl( i_fd, MJPIOC_QBUF_CAPT, &i ) < 0 )
1106             {
1107                 msg_Err( p_demux, "unable to queue frame" );
1108                 goto vdev_failed;
1109             }
1110         }
1111     }
1112     else
1113     {
1114         /* Fill in picture_t fields */
1115         vout_InitPicture( VLC_OBJECT(p_demux), &p_sys->pic, p_sys->i_fourcc,
1116                           p_sys->i_width, p_sys->i_height, p_sys->i_width *
1117                           VOUT_ASPECT_FACTOR / p_sys->i_height );
1118         if( !p_sys->pic.i_planes )
1119         {
1120             msg_Err( p_demux, "unsupported chroma" );
1121             goto vdev_failed;
1122         }
1123         p_sys->i_video_frame_size = 0;
1124         for( i = 0; i < p_sys->pic.i_planes; i++ )
1125         {
1126             p_sys->i_video_frame_size += p_sys->pic.p[i].i_visible_lines *
1127               p_sys->pic.p[i].i_visible_pitch;
1128         }
1129
1130         msg_Dbg( p_demux, "v4l device uses frame size: %i",
1131                  p_sys->i_video_frame_size );
1132         msg_Dbg( p_demux, "v4l device uses chroma: %4.4s",
1133                 (char*)&p_sys->i_fourcc );
1134
1135         /* Allocate mmap buffer */
1136         if( ioctl( i_fd, VIDIOCGMBUF, &p_sys->vid_mbuf ) < 0 )
1137         {
1138             msg_Err( p_demux, "mmap unsupported" );
1139             goto vdev_failed;
1140         }
1141
1142         p_sys->p_video_mmap = mmap( 0, p_sys->vid_mbuf.size,
1143                                     PROT_READ|PROT_WRITE, MAP_SHARED,
1144                                     i_fd, 0 );
1145         if( p_sys->p_video_mmap == MAP_FAILED )
1146         {
1147             /* FIXME -> normal read */
1148             msg_Err( p_demux, "mmap failed" );
1149             goto vdev_failed;
1150         }
1151
1152         /* init grabbing */
1153         p_sys->vid_mmap.frame  = 0;
1154         p_sys->vid_mmap.width  = p_sys->i_width;
1155         p_sys->vid_mmap.height = p_sys->i_height;
1156         p_sys->vid_mmap.format = p_sys->vid_picture.palette;
1157         if( ioctl( i_fd, VIDIOCMCAPTURE, &p_sys->vid_mmap ) < 0 )
1158         {
1159             msg_Warn( p_demux, "%4.4s refused", (char*)&p_sys->i_fourcc );
1160             msg_Err( p_demux, "chroma selection failed" );
1161             goto vdev_failed;
1162         }
1163     }
1164     return i_fd;
1165
1166 vdev_failed:
1167
1168     if( i_fd >= 0 ) close( i_fd );
1169     return -1;
1170 }
1171
1172 /*****************************************************************************
1173  * OpenAudioDev:
1174  *****************************************************************************/
1175 static int OpenAudioDev( demux_t *p_demux, char *psz_device )
1176 {
1177     demux_sys_t *p_sys = p_demux->p_sys;
1178     int i_fd, i_format;
1179
1180     if( (i_fd = open( psz_device, O_RDONLY | O_NONBLOCK )) < 0 )
1181     {
1182         msg_Err( p_demux, "cannot open audio device (%s)", strerror( errno ) );
1183         goto adev_fail;
1184     }
1185
1186     i_format = AFMT_S16_LE;
1187     if( ioctl( i_fd, SNDCTL_DSP_SETFMT, &i_format ) < 0
1188         || i_format != AFMT_S16_LE )
1189     {
1190         msg_Err( p_demux, "cannot set audio format (16b little endian) "
1191                  "(%s)", strerror( errno ) );
1192         goto adev_fail;
1193     }
1194
1195     if( ioctl( i_fd, SNDCTL_DSP_STEREO,
1196                &p_sys->b_stereo ) < 0 )
1197     {
1198         msg_Err( p_demux, "cannot set audio channels count (%s)",
1199                  strerror( errno ) );
1200         goto adev_fail;
1201     }
1202
1203     if( ioctl( i_fd, SNDCTL_DSP_SPEED,
1204                &p_sys->i_sample_rate ) < 0 )
1205     {
1206         msg_Err( p_demux, "cannot set audio sample rate (%s)",
1207                  strerror( errno ) );
1208         goto adev_fail;
1209     }
1210
1211     msg_Dbg( p_demux, "openened adev=`%s' %s %dHz",
1212              psz_device, p_sys->b_stereo ? "stereo" : "mono",
1213              p_sys->i_sample_rate );
1214
1215     p_sys->i_audio_max_frame_size = 6 * 1024;
1216
1217     return i_fd;
1218
1219  adev_fail:
1220
1221     if( i_fd >= 0 ) close( i_fd );
1222     return -1;
1223 }
1224
1225 /*****************************************************************************
1226  * GrabAudio: grab audio
1227  *****************************************************************************/
1228 static block_t *GrabAudio( demux_t *p_demux )
1229 {
1230     demux_sys_t *p_sys = p_demux->p_sys;
1231     struct audio_buf_info buf_info;
1232     int i_read, i_correct;
1233     block_t *p_block;
1234
1235     if( p_sys->p_block_audio ) p_block = p_sys->p_block_audio;
1236     else p_block = block_New( p_demux, p_sys->i_audio_max_frame_size );
1237
1238     if( !p_block )
1239     {
1240         msg_Warn( p_demux, "cannot get block" );
1241         return 0;
1242     }
1243
1244     p_sys->p_block_audio = p_block;
1245
1246     i_read = read( p_sys->fd_audio, p_block->p_buffer,
1247                    p_sys->i_audio_max_frame_size );
1248
1249     if( i_read <= 0 ) return 0;
1250
1251     p_block->i_buffer = i_read;
1252     p_sys->p_block_audio = 0;
1253
1254     /* Correct the date because of kernel buffering */
1255     i_correct = i_read;
1256     if( ioctl( p_sys->fd_audio, SNDCTL_DSP_GETISPACE, &buf_info ) == 0 )
1257     {
1258         i_correct += buf_info.bytes;
1259     }
1260
1261     p_block->i_pts = p_block->i_dts =
1262         mdate() - I64C(1000000) * (mtime_t)i_correct /
1263         2 / ( p_sys->b_stereo ? 2 : 1) / p_sys->i_sample_rate;
1264
1265     return p_block;
1266 }
1267
1268 /*****************************************************************************
1269  * GrabVideo:
1270  *****************************************************************************/
1271 static uint8_t *GrabCapture( demux_t *p_demux )
1272 {
1273     demux_sys_t *p_sys = p_demux->p_sys;
1274     int i_captured_frame = p_sys->i_frame_pos;
1275
1276     p_sys->vid_mmap.frame = (p_sys->i_frame_pos + 1) % p_sys->vid_mbuf.frames;
1277
1278     while( ioctl( p_sys->fd_video, VIDIOCMCAPTURE, &p_sys->vid_mmap ) < 0 )
1279     {
1280         if( errno != EAGAIN )
1281         {
1282             msg_Err( p_demux, "failed capturing new frame" );
1283             return NULL;
1284         }
1285
1286         if( p_demux->b_die )
1287         {
1288             return NULL;
1289         }
1290
1291         msg_Dbg( p_demux, "grab failed, trying again" );
1292     }
1293
1294     while( ioctl(p_sys->fd_video, VIDIOCSYNC, &p_sys->i_frame_pos) < 0 )
1295     {
1296         if( errno != EAGAIN && errno != EINTR )
1297         {
1298             msg_Err( p_demux, "failed syncing new frame" );
1299             return NULL;
1300         }
1301     }
1302
1303     p_sys->i_frame_pos = p_sys->vid_mmap.frame;
1304     /* leave i_video_frame_size alone */
1305     return p_sys->p_video_mmap + p_sys->vid_mbuf.offsets[i_captured_frame];
1306 }
1307
1308 static uint8_t *GrabMJPEG( demux_t *p_demux )
1309 {
1310     demux_sys_t *p_sys = p_demux->p_sys;
1311     struct mjpeg_sync sync;
1312     uint8_t *p_frame, *p_field, *p;
1313     uint16_t tag;
1314     uint32_t i_size;
1315     struct quicktime_mjpeg_app1 *p_app1 = NULL;
1316
1317     /* re-queue the last frame we sync'd */
1318     if( p_sys->i_frame_pos != -1 )
1319     {
1320         while( ioctl( p_sys->fd_video, MJPIOC_QBUF_CAPT,
1321                                        &p_sys->i_frame_pos ) < 0 )
1322         {
1323             if( errno != EAGAIN && errno != EINTR )
1324             {
1325                 msg_Err( p_demux, "failed capturing new frame" );
1326                 return NULL;
1327             }
1328         }
1329     }
1330
1331     /* sync on the next frame */
1332     while( ioctl( p_sys->fd_video, MJPIOC_SYNC, &sync ) < 0 )
1333     {
1334         if( errno != EAGAIN && errno != EINTR )
1335         {
1336             msg_Err( p_demux, "failed syncing new frame" );
1337             return NULL;
1338         }
1339     }
1340
1341     p_sys->i_frame_pos = sync.frame;
1342     p_frame = p_sys->p_video_mmap + p_sys->mjpeg_buffers.size * sync.frame;
1343
1344     /* p_frame now points to the data.  fix up the Quicktime APP1 marker */
1345     tag = 0xffd9;
1346     tag = hton16( tag );
1347     p_field = p_frame;
1348
1349     /* look for EOI */
1350     p = memmem( p_field, sync.length, &tag, 2 );
1351
1352     if( p )
1353     {
1354         p += 2; /* data immediately following EOI */
1355         /* UNALIGNED! */
1356         p_app1 = (struct quicktime_mjpeg_app1 *)(p_field + 6);
1357
1358         i_size = ((uint32_t)(p - p_field));
1359         i_size = hton32( i_size );
1360         memcpy( &p_app1->i_field_size, &i_size, 4 );
1361
1362         while( *p == 0xff && *(p+1) == 0xff )
1363             p++;
1364
1365         i_size = ((uint32_t)(p - p_field));
1366         i_size = hton32( i_size );
1367         memcpy( &p_app1->i_padded_field_size, &i_size, 4 );
1368     }
1369
1370     tag = 0xffd8;
1371     tag = hton16( tag );
1372     p_field = memmem( p, sync.length - (size_t)(p - p_frame), &tag, 2 );
1373
1374     if( p_field )
1375     {
1376         i_size = (uint32_t)(p_field - p_frame);
1377         i_size = hton32( i_size );
1378         memcpy( &p_app1->i_next_field, &i_size, 4 );
1379
1380         /* UNALIGNED! */
1381         p_app1 = (struct quicktime_mjpeg_app1 *)(p_field + 6);
1382         tag = 0xffd9;
1383         tag = hton16( tag );
1384         p = memmem( p_field, sync.length - (size_t)(p_field - p_frame),
1385                 &tag, 2 );
1386
1387         if( !p )
1388         {
1389             /* sometimes the second field doesn't have the EOI.  just put it
1390              * there
1391              */
1392             p = p_frame + sync.length;
1393             memcpy( p, &tag, 2 );
1394             sync.length += 2;
1395         }
1396
1397         p += 2;
1398         i_size = (uint32_t)(p - p_field);
1399         i_size = hton32( i_size );
1400         memcpy( &p_app1->i_field_size, &i_size, 4 );
1401         i_size = (uint32_t)(sync.length - (uint32_t)(p_field - p_frame));
1402         i_size = hton32( i_size );
1403         memcpy( &p_app1->i_padded_field_size, &i_size, 4 );
1404     }
1405
1406     p_sys->i_video_frame_size = sync.length;
1407     return p_frame;
1408 }
1409
1410 static block_t *GrabVideo( demux_t *p_demux )
1411 {
1412     demux_sys_t *p_sys = p_demux->p_sys;
1413     uint8_t     *p_frame;
1414     block_t     *p_block;
1415
1416     if( p_sys->f_fps >= 0.1 && p_sys->i_video_pts > 0 )
1417     {
1418         mtime_t i_dur = (mtime_t)((double)1000000 / (double)p_sys->f_fps);
1419
1420         /* Did we wait long enough ? (frame rate reduction) */
1421         if( p_sys->i_video_pts + i_dur > mdate() ) return 0;
1422     }
1423
1424     if( p_sys->b_mjpeg ) p_frame = GrabMJPEG( p_demux );
1425     else p_frame = GrabCapture( p_demux );
1426
1427     if( !p_frame ) return 0;
1428
1429     if( !( p_block = block_New( p_demux, p_sys->i_video_frame_size ) ) )
1430     {
1431         msg_Warn( p_demux, "cannot get block" );
1432         return 0;
1433     }
1434
1435     memcpy( p_block->p_buffer, p_frame, p_sys->i_video_frame_size );
1436     p_sys->i_video_pts = p_block->i_pts = p_block->i_dts = mdate();
1437
1438     return p_block;
1439 }