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     set_category( CAT_INPUT );
  93     set_subcategory( SUBCAT_INPUT_ACCESS );
  94
  95     add_integer( "v4l-caching", DEFAULT_PTS_DELAY / 1000, NULL,
  96                  CACHING_TEXT, CACHING_LONGTEXT, VLC_TRUE );
  97     add_string( "v4l-vdev", "/dev/video", 0, VDEV_TEXT, VDEV_LONGTEXT,
  98                 VLC_FALSE );
  99     add_string( "v4l-adev", "/dev/dsp", 0, ADEV_TEXT, ADEV_LONGTEXT,
 100                 VLC_FALSE );
 101     add_string( "v4l-chroma", NULL, NULL, CHROMA_TEXT, CHROMA_LONGTEXT,
 102                 VLC_TRUE );
 103
 104     add_shortcut( "v4l" );
 105     set_capability( "access_demux", 10 );
 106     set_callbacks( Open, Close );
 107 vlc_module_end();
 108
 109 /*****************************************************************************
 110  * Access: local prototypes
 111  *****************************************************************************/
 112 static int Demux  ( demux_t * );
 113 static int Control( demux_t *, int, va_list );
 114
 115 static void ParseMRL    ( demux_t * );
 116 static int  OpenVideoDev( demux_t *, char * );
 117 static int  OpenAudioDev( demux_t *, char * );
 118
 119 static block_t *GrabAudio( demux_t * );
 120 static block_t *GrabVideo( demux_t * );
 121
 122 #define MJPEG_BUFFER_SIZE (256*1024)
 123
 124 struct quicktime_mjpeg_app1
 125 {
 126     uint32_t    i_reserved;             /* set to 0 */
 127     uint32_t    i_tag;                  /* 'mjpg' */
 128     uint32_t    i_field_size;           /* offset following EOI */
 129     uint32_t    i_padded_field_size;    /* offset following EOI+pad */
 130     uint32_t    i_next_field;           /* offset to next field */
 131     uint32_t    i_DQT_offset;
 132     uint32_t    i_DHT_offset;
 133     uint32_t    i_SOF_offset;
 134     uint32_t    i_SOS_offset;
 135     uint32_t    i_data_offset;          /* following SOS marker data */
 136 };
 137
 138 static struct
 139 {
 140     int i_v4l;
 141     int i_fourcc;
 142
 143 } v4lchroma_to_fourcc[] =
 144 {
 145     { VIDEO_PALETTE_GREY, VLC_FOURCC( 'G', 'R', 'E', 'Y' ) },
 146     { VIDEO_PALETTE_HI240, VLC_FOURCC( 'I', '2', '4', '0' ) },
 147     { VIDEO_PALETTE_RGB565, VLC_FOURCC( 'R', 'V', '1', '6' ) },
 148     { VIDEO_PALETTE_RGB555, VLC_FOURCC( 'R', 'V', '1', '5' ) },
 149     { VIDEO_PALETTE_RGB24, VLC_FOURCC( 'R', 'V', '2', '4' ) },
 150     { VIDEO_PALETTE_RGB32, VLC_FOURCC( 'R', 'V', '3', '2' ) },
 151     { VIDEO_PALETTE_YUV422, VLC_FOURCC( 'I', '4', '2', '2' ) },
 152     { VIDEO_PALETTE_YUYV, VLC_FOURCC( 'Y', 'U', 'Y', 'V' ) },
 153     { VIDEO_PALETTE_UYVY, VLC_FOURCC( 'U', 'Y', 'V', 'Y' ) },
 154     { VIDEO_PALETTE_YUV420, VLC_FOURCC( 'I', '4', '2', 'N' ) },
 155     { VIDEO_PALETTE_YUV411, VLC_FOURCC( 'I', '4', '1', 'N' ) },
 156     { VIDEO_PALETTE_RAW, VLC_FOURCC( 'G', 'R', 'A', 'W' ) },
 157     { VIDEO_PALETTE_YUV422P, VLC_FOURCC( 'I', '4', '2', '2' ) },
 158     { VIDEO_PALETTE_YUV420P, VLC_FOURCC( 'I', '4', '2', '0' ) },
 159     { VIDEO_PALETTE_YUV411P, VLC_FOURCC( 'I', '4', '1', '1' ) },
 160     { 0, 0 }
 161 };
 162
 163 struct demux_sys_t
 164 {
 165     /* Devices */
 166     char *psz_device;         /* Main device from MRL, can be video or audio */
 167
 168     char *psz_vdev;
 169     int  fd_video;
 170
 171     char *psz_adev;
 172     int  fd_audio;
 173
 174     /* Video properties */
 175     picture_t pic;
 176
 177     int i_fourcc;
 178     int i_channel;
 179     int i_audio;
 180     int i_norm;
 181     int i_tuner;
 182     int i_frequency;
 183     int i_width;
 184     int i_height;
 185
 186     int i_brightness;
 187     int i_hue;
 188     int i_colour;
 189     int i_contrast;
 190
 191     float f_fps;            /* <= 0.0 mean to grab at full rate */
 192     mtime_t i_video_pts;    /* only used when f_fps > 0 */
 193
 194     vlc_bool_t b_mjpeg;
 195     int i_decimation;
 196     int i_quality;
 197
 198     struct video_capability vid_cap;
 199     struct video_mbuf       vid_mbuf;
 200     struct mjpeg_requestbuffers mjpeg_buffers;
 201
 202     uint8_t *p_video_mmap;
 203     int     i_frame_pos;
 204
 205     struct video_mmap   vid_mmap;
 206     struct video_picture vid_picture;
 207
 208     int          i_video_frame_size;
 209     es_out_id_t  *p_es_video;
 210
 211     /* Audio properties */
 212     vlc_fourcc_t i_acodec_raw;
 213     int          i_sample_rate;
 214     vlc_bool_t   b_stereo;
 215     int          i_audio_max_frame_size;
 216     block_t      *p_block_audio;
 217     es_out_id_t  *p_es_audio;
 218 };
 219
 220 /*****************************************************************************
 221  * Open: opens v4l device
 222  *****************************************************************************
 223  *
 224  * url: <video device>::::
 225  *
 226  *****************************************************************************/
 227 static int Open( vlc_object_t *p_this )
 228 {
 229     demux_t     *p_demux = (demux_t*)p_this;
 230     demux_sys_t *p_sys;
 231
 232     /* Only when selected */
 233     if( *p_demux->psz_access == '\0' )
 234         return VLC_EGENERIC;
 235
 236     /* Set up p_demux */
 237     p_demux->pf_demux = Demux;
 238     p_demux->pf_control = Control;
 239     p_demux->info.i_update = 0;
 240     p_demux->info.i_title = 0;
 241     p_demux->info.i_seekpoint = 0;
 242     p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
 243     memset( p_sys, 0, sizeof( demux_sys_t ) );
 244
 245     p_sys->i_audio          = -1;
 246     p_sys->i_norm           = VIDEO_MODE_AUTO;    // auto
 247     p_sys->i_tuner          = -1;
 248     p_sys->i_frequency      = -1;
 249
 250     p_sys->f_fps            = -1.0;
 251     p_sys->i_video_pts      = -1;
 252
 253     p_sys->i_brightness     = -1;
 254     p_sys->i_hue            = -1;
 255     p_sys->i_colour         = -1;
 256     p_sys->i_contrast       = -1;
 257
 258     p_sys->b_mjpeg     = VLC_FALSE;
 259     p_sys->i_decimation = 1;
 260     p_sys->i_quality = 100;
 261
 262     p_sys->i_sample_rate  = 44100;
 263     p_sys->b_stereo       = VLC_TRUE;
 264
 265     p_sys->psz_device = p_sys->psz_vdev = p_sys->psz_adev = NULL;
 266     p_sys->fd_video = -1;
 267     p_sys->fd_audio = -1;
 268
 269     p_sys->p_es_video = p_sys->p_es_audio = 0;
 270     p_sys->p_block_audio = 0;
 271
 272     ParseMRL( p_demux );
 273
 274     /* Find main device (video or audio) */
 275     if( p_sys->psz_device && *p_sys->psz_device )
 276     {
 277         msg_Dbg( p_demux, "main device=`%s'", p_sys->psz_device );
 278
 279         /* Try to open as video device */
 280         p_sys->fd_video = OpenVideoDev( p_demux, p_sys->psz_device );
 281
 282         if( p_sys->fd_video < 0 )
 283         {
 284             /* Try to open as audio device */
 285             p_sys->fd_audio = OpenAudioDev( p_demux, p_sys->psz_device );
 286             if( p_sys->fd_audio >= 0 )
 287             {
 288                 if( p_sys->psz_adev ) free( p_sys->psz_adev );
 289                 p_sys->psz_adev = p_sys->psz_device;
 290                 p_sys->psz_device = NULL;
 291             }
 292         }
 293         else
 294         {
 295             if( p_sys->psz_vdev ) free( p_sys->psz_vdev );
 296             p_sys->psz_vdev = p_sys->psz_device;
 297             p_sys->psz_device = NULL;
 298         }
 299     }
 300
 301     /* If no device opened, only continue if the access was forced */
 302     if( p_sys->fd_video < 0 && p_sys->fd_audio < 0 )
 303     {
 304         if( strcmp( p_demux->psz_access, "v4l" ) )
 305         {
 306             Close( p_this );
 307             return VLC_EGENERIC;
 308         }
 309     }
 310
 311     /* Find video device */
 312     if( p_sys->fd_video < 0 )
 313     {
 314         if( !p_sys->psz_vdev || !*p_sys->psz_vdev )
 315         {
 316             if( p_sys->psz_vdev ) free( p_sys->psz_vdev );
 317             p_sys->psz_vdev = var_CreateGetString( p_demux, "v4l-vdev" );;
 318         }
 319
 320         if( p_sys->psz_vdev && *p_sys->psz_vdev )
 321         {
 322             p_sys->fd_video = OpenVideoDev( p_demux, p_sys->psz_vdev );
 323         }
 324     }
 325
 326     /* Find audio device */
 327     if( p_sys->fd_audio < 0 )
 328     {
 329         if( !p_sys->psz_adev || !*p_sys->psz_adev )
 330         {
 331             if( p_sys->psz_adev ) free( p_sys->psz_adev );
 332             p_sys->psz_adev = var_CreateGetString( p_demux, "v4l-adev" );;
 333         }
 334
 335         if( p_sys->psz_adev && *p_sys->psz_adev )
 336         {
 337             p_sys->fd_audio = OpenAudioDev( p_demux, p_sys->psz_adev );
 338         }
 339     }
 340
 341     if( p_sys->fd_video < 0 && p_sys->fd_audio < 0 )
 342     {
 343         Close( p_this );
 344         return VLC_EGENERIC;
 345     }
 346
 347     msg_Dbg( p_demux, "v4l grabbing started" );
 348
 349     /* Declare elementary streams */
 350     if( p_sys->fd_video >= 0 )
 351     {
 352         es_format_t fmt;
 353         es_format_Init( &fmt, VIDEO_ES, p_sys->i_fourcc );
 354         fmt.video.i_width  = p_sys->i_width;
 355         fmt.video.i_height = p_sys->i_height;
 356         fmt.video.i_aspect = 4 * VOUT_ASPECT_FACTOR / 3;
 357
 358         /* Setup rgb mask for RGB formats */
 359         if( p_sys->i_fourcc == VLC_FOURCC('R','V','2','4') )
 360         {
 361             /* This is in BGR format */
 362             fmt.video.i_bmask = 0x00ff0000;
 363             fmt.video.i_gmask = 0x0000ff00;
 364             fmt.video.i_rmask = 0x000000ff;
 365         }
 366
 367         msg_Dbg( p_demux, "added new video es %4.4s %dx%d",
 368                  (char*)&fmt.i_codec, fmt.video.i_width, fmt.video.i_height );
 369         p_sys->p_es_video = es_out_Add( p_demux->out, &fmt );
 370     }
 371
 372     if( p_sys->fd_audio >= 0 )
 373     {
 374         es_format_t fmt;
 375         es_format_Init( &fmt, AUDIO_ES, VLC_FOURCC('a','r','a','w') );
 376
 377         fmt.audio.i_channels = p_sys->b_stereo ? 2 : 1;
 378         fmt.audio.i_rate = p_sys->i_sample_rate;
 379         fmt.audio.i_bitspersample = 16; // FIXME ?
 380         fmt.audio.i_blockalign = fmt.audio.i_channels *
 381             fmt.audio.i_bitspersample / 8;
 382         fmt.i_bitrate = fmt.audio.i_channels * fmt.audio.i_rate *
 383             fmt.audio.i_bitspersample;
 384
 385         msg_Dbg( p_demux, "new audio es %d channels %dHz",
 386                  fmt.audio.i_channels, fmt.audio.i_rate );
 387
 388         p_sys->p_es_audio = es_out_Add( p_demux->out, &fmt );
 389     }
 390
 391     /* Update default_pts to a suitable value for access */
 392     var_Create( p_demux, "v4l-caching", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 393
 394     return VLC_SUCCESS;
 395 }
 396
 397 /*****************************************************************************
 398  * Close: close device, free resources
 399  *****************************************************************************/
 400 static void Close( vlc_object_t *p_this )
 401 {
 402     demux_t     *p_demux = (demux_t *)p_this;
 403     demux_sys_t *p_sys   = p_demux->p_sys;
 404
 405     if( p_sys->psz_device ) free( p_sys->psz_device );
 406     if( p_sys->psz_vdev )   free( p_sys->psz_vdev );
 407     if( p_sys->psz_adev )   free( p_sys->psz_adev );
 408     if( p_sys->fd_video >= 0 ) close( p_sys->fd_video );
 409     if( p_sys->fd_audio >= 0 ) close( p_sys->fd_audio );
 410     if( p_sys->p_block_audio ) block_Release( p_sys->p_block_audio );
 411
 412     if( p_sys->b_mjpeg )
 413     {
 414         int i_noframe = -1;
 415         ioctl( p_sys->fd_video, MJPIOC_QBUF_CAPT, &i_noframe );
 416     }
 417
 418     if( p_sys->p_video_mmap && p_sys->p_video_mmap != MAP_FAILED )
 419     {
 420         if( p_sys->b_mjpeg )
 421             munmap( p_sys->p_video_mmap, p_sys->mjpeg_buffers.size *
 422                     p_sys->mjpeg_buffers.count );
 423         else
 424             munmap( p_sys->p_video_mmap, p_sys->vid_mbuf.size );
 425     }
 426
 427     free( p_sys );
 428 }
 429
 430 /*****************************************************************************
 431  * Control:
 432  *****************************************************************************/
 433 static int Control( demux_t *p_demux, int i_query, va_list args )
 434 {
 435     vlc_bool_t *pb;
 436     int64_t    *pi64;
 437
 438     switch( i_query )
 439     {
 440         /* Special for access_demux */
 441         case DEMUX_CAN_PAUSE:
 442         case DEMUX_SET_PAUSE_STATE:
 443         case DEMUX_CAN_CONTROL_PACE:
 444             pb = (vlc_bool_t*)va_arg( args, vlc_bool_t * );
 445             *pb = VLC_FALSE;
 446             return VLC_SUCCESS;
 447
 448         case DEMUX_GET_PTS_DELAY:
 449             pi64 = (int64_t*)va_arg( args, int64_t * );
 450             *pi64 = (int64_t)var_GetInteger( p_demux, "v4l-caching" ) * 1000;
 451             return VLC_SUCCESS;
 452
 453         case DEMUX_GET_TIME:
 454             pi64 = (int64_t*)va_arg( args, int64_t * );
 455             *pi64 = mdate();
 456             return VLC_SUCCESS;
 457
 458         /* TODO implement others */
 459         default:
 460             return VLC_EGENERIC;
 461     }
 462
 463     return VLC_EGENERIC;
 464 }
 465
 466 /*****************************************************************************
 467  * Demux:
 468  *****************************************************************************/
 469 static int Demux( demux_t *p_demux )
 470 {
 471     demux_sys_t *p_sys = p_demux->p_sys;
 472     es_out_id_t  *p_es = p_sys->p_es_audio;
 473     block_t *p_block = NULL;
 474
 475     /* Try grabbing audio frames first */
 476     if( p_sys->fd_audio < 0 || !( p_block = GrabAudio( p_demux ) ) )
 477     {
 478         /* Try grabbing video frame */
 479         p_es = p_sys->p_es_video;
 480         if( p_sys->fd_video > 0 ) p_block = GrabVideo( p_demux );
 481     }
 482
 483     if( !p_block )
 484     {
 485         /* Sleep so we do not consume all the cpu, 10ms seems
 486          * like a good value (100fps) */
 487         msleep( 10000 );
 488         return 1;
 489     }
 490
 491     es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
 492     es_out_Send( p_demux->out, p_es, p_block );
 493
 494     return 1;
 495 }
 496
 497 /*****************************************************************************
 498  * ParseMRL: parse the options contained in the MRL
 499  *****************************************************************************/
 500 static void ParseMRL( demux_t *p_demux )
 501 {
 502     demux_sys_t *p_sys = p_demux->p_sys;
 503
 504     char *psz_dup = strdup( p_demux->psz_path );
 505     char *psz_parser = psz_dup;
 506
 507     while( *psz_parser && *psz_parser != ':' )
 508     {
 509         psz_parser++;
 510     }
 511
 512     if( *psz_parser == ':' )
 513     {
 514         /* read options */
 515         for( ;; )
 516         {
 517             *psz_parser++ = '\0';
 518             if( !strncmp( psz_parser, "channel=", strlen( "channel=" ) ) )
 519             {
 520                 p_sys->i_channel = strtol( psz_parser + strlen( "channel=" ),
 521                                            &psz_parser, 0 );
 522             }
 523             else if( !strncmp( psz_parser, "norm=", strlen( "norm=" ) ) )
 524             {
 525                 psz_parser += strlen( "norm=" );
 526                 if( !strncmp( psz_parser, "pal", strlen( "pal" ) ) )
 527                 {
 528                     p_sys->i_norm = VIDEO_MODE_PAL;
 529                     psz_parser += strlen( "pal" );
 530                 }
 531                 else if( !strncmp( psz_parser, "ntsc", strlen( "ntsc" ) ) )
 532                 {
 533                     p_sys->i_norm = VIDEO_MODE_NTSC;
 534                     psz_parser += strlen( "ntsc" );
 535                 }
 536                 else if( !strncmp( psz_parser, "secam", strlen( "secam" ) ) )
 537                 {
 538                     p_sys->i_norm = VIDEO_MODE_SECAM;
 539                     psz_parser += strlen( "secam" );
 540                 }
 541                 else if( !strncmp( psz_parser, "auto", strlen( "auto" ) ) )
 542                 {
 543                     p_sys->i_norm = VIDEO_MODE_AUTO;
 544                     psz_parser += strlen( "auto" );
 545                 }
 546                 else
 547                 {
 548                     p_sys->i_norm = strtol( psz_parser, &psz_parser, 0 );
 549                 }
 550             }
 551             else if( !strncmp( psz_parser, "frequency=",
 552                                strlen( "frequency=" ) ) )
 553             {
 554                 p_sys->i_frequency =
 555                     strtol( psz_parser + strlen( "frequency=" ),
 556                             &psz_parser, 0 );
 557                 if( p_sys->i_frequency < 30000 )
 558                 {
 559                     msg_Warn( p_demux, "v4l syntax has changed : "
 560                               "'frequency' is now channel frequency in kHz");
 561                 }
 562             }
 563             else if( !strncmp( psz_parser, "audio=", strlen( "audio=" ) ) )
 564             {
 565                 p_sys->i_audio = strtol( psz_parser + strlen( "audio=" ),
 566                                          &psz_parser, 0 );
 567             }
 568             else if( !strncmp( psz_parser, "size=", strlen( "size=" ) ) )
 569             {
 570                 psz_parser += strlen( "size=" );
 571                 if( !strncmp( psz_parser, "subqcif", strlen( "subqcif" ) ) )
 572                 {
 573                     p_sys->i_width  = 128;
 574                     p_sys->i_height = 96;
 575                 }
 576                 else if( !strncmp( psz_parser, "qsif", strlen( "qsif" ) ) )
 577                 {
 578                     p_sys->i_width  = 160;
 579                     p_sys->i_height = 120;
 580                 }
 581                 else if( !strncmp( psz_parser, "qcif", strlen( "qcif" ) ) )
 582                 {
 583                     p_sys->i_width  = 176;
 584                     p_sys->i_height = 144;
 585                 }
 586                 else if( !strncmp( psz_parser, "sif", strlen( "sif" ) ) )
 587                 {
 588                     p_sys->i_width  = 320;
 589                     p_sys->i_height = 244;
 590                 }
 591                 else if( !strncmp( psz_parser, "cif", strlen( "cif" ) ) )
 592                 {
 593                     p_sys->i_width  = 352;
 594                     p_sys->i_height = 288;
 595                 }
 596                 else if( !strncmp( psz_parser, "vga", strlen( "vga" ) ) )
 597                 {
 598                     p_sys->i_width  = 640;
 599                     p_sys->i_height = 480;
 600                 }
 601                 else
 602                 {
 603                     /* widthxheight */
 604                     p_sys->i_width = strtol( psz_parser, &psz_parser, 0 );
 605                     if( *psz_parser == 'x' || *psz_parser == 'X')
 606                     {
 607                         p_sys->i_height = strtol( psz_parser + 1,
 608                                                   &psz_parser, 0 );
 609                     }
 610                     msg_Dbg( p_demux, "WxH %dx%d", p_sys->i_width,
 611                              p_sys->i_height );
 612                 }
 613             }
 614             else if( !strncmp( psz_parser, "brightness=", strlen( "brightness=" ) ) )
 615             {
 616                 p_sys->i_brightness = strtol( psz_parser + strlen( "brightness=" ),
 617                                               &psz_parser, 0 );
 618             }
 619             else if( !strncmp( psz_parser, "colour=", strlen( "colour=" ) ) )
 620             {
 621                 p_sys->i_colour = strtol( psz_parser + strlen( "colour=" ),
 622                                           &psz_parser, 0 );
 623             }
 624             else if( !strncmp( psz_parser, "hue=", strlen( "hue=" ) ) )
 625             {
 626                 p_sys->i_hue = strtol( psz_parser + strlen( "hue=" ),
 627                                        &psz_parser, 0 );
 628             }
 629             else if( !strncmp( psz_parser, "contrast=", strlen( "contrast=" ) ) )
 630             {
 631                 p_sys->i_contrast = strtol( psz_parser + strlen( "contrast=" ),
 632                                             &psz_parser, 0 );
 633             }
 634             else if( !strncmp( psz_parser, "tuner=", strlen( "tuner=" ) ) )
 635             {
 636                 p_sys->i_tuner = strtol( psz_parser + strlen( "tuner=" ),
 637                                          &psz_parser, 0 );
 638             }
 639             else if( !strncmp( psz_parser, "adev=", strlen( "adev=" ) ) )
 640             {
 641                 int  i_len;
 642
 643                 psz_parser += strlen( "adev=" );
 644                 if( strchr( psz_parser, ':' ) )
 645                 {
 646                     i_len = strchr( psz_parser, ':' ) - psz_parser;
 647                 }
 648                 else
 649                 {
 650                     i_len = strlen( psz_parser );
 651                 }
 652
 653                 p_sys->psz_adev = strndup( psz_parser, i_len );
 654
 655                 psz_parser += i_len;
 656             }
 657             else if( !strncmp( psz_parser, "samplerate=",
 658                                strlen( "samplerate=" ) ) )
 659             {
 660                 p_sys->i_sample_rate =
 661                     strtol( psz_parser + strlen( "samplerate=" ),
 662                             &psz_parser, 0 );
 663             }
 664             else if( !strncmp( psz_parser, "stereo", strlen( "stereo" ) ) )
 665             {
 666                 psz_parser += strlen( "stereo" );
 667
 668                 p_sys->b_stereo = VLC_TRUE;
 669             }
 670             else if( !strncmp( psz_parser, "mono", strlen( "mono" ) ) )
 671             {
 672                 psz_parser += strlen( "mono" );
 673
 674                 p_sys->b_stereo = VLC_FALSE;
 675             }
 676             else if( !strncmp( psz_parser, "mjpeg", strlen( "mjpeg" ) ) )
 677             {
 678                 psz_parser += strlen( "mjpeg" );
 679
 680                 p_sys->b_mjpeg = VLC_TRUE;
 681             }
 682             else if( !strncmp( psz_parser, "decimation=",
 683                         strlen( "decimation=" ) ) )
 684             {
 685                 p_sys->i_decimation =
 686                     strtol( psz_parser + strlen( "decimation=" ),
 687                             &psz_parser, 0 );
 688             }
 689             else if( !strncmp( psz_parser, "quality=",
 690                         strlen( "quality=" ) ) )
 691             {
 692                 p_sys->i_quality =
 693                     strtol( psz_parser + strlen( "quality=" ),
 694                             &psz_parser, 0 );
 695             }
 696             else if( !strncmp( psz_parser, "fps=", strlen( "fps=" ) ) )
 697             {
 698                 p_sys->f_fps = strtof( psz_parser + strlen( "fps=" ),
 699                                        &psz_parser );
 700             }
 701             else
 702             {
 703                 msg_Warn( p_demux, "unknown option" );
 704             }
 705
 706             while( *psz_parser && *psz_parser != ':' )
 707             {
 708                 psz_parser++;
 709             }
 710
 711             if( *psz_parser == '\0' )
 712             {
 713                 break;
 714             }
 715         }
 716     }
 717
 718     if( *psz_dup )
 719     {
 720         p_sys->psz_device = strdup( psz_dup );
 721     }
 722     if( psz_dup ) free( psz_dup );
 723 }
 724
 725 /*****************************************************************************
 726  * OpenVideoDev:
 727  *****************************************************************************/
 728 static int OpenVideoDev( demux_t *p_demux, char *psz_device )
 729 {
 730     demux_sys_t *p_sys = p_demux->p_sys;
 731     int i_fd;
 732
 733     struct video_channel vid_channel;
 734     struct mjpeg_params mjpeg;
 735     int i;
 736
 737     if( ( i_fd = open( psz_device, O_RDWR ) ) < 0 )
 738     {
 739         msg_Err( p_demux, "cannot open device (%s)", strerror( errno ) );
 740         goto vdev_failed;
 741     }
 742
 743     if( ioctl( i_fd, VIDIOCGCAP, &p_sys->vid_cap ) < 0 )
 744     {
 745         msg_Err( p_demux, "cannot get capabilities (%s)", strerror( errno ) );
 746         goto vdev_failed;
 747     }
 748
 749     msg_Dbg( p_demux,
 750              "V4L device %s %d channels %d audios %d < w < %d %d < h < %d",
 751              p_sys->vid_cap.name,
 752              p_sys->vid_cap.channels,
 753              p_sys->vid_cap.audios,
 754              p_sys->vid_cap.minwidth,  p_sys->vid_cap.maxwidth,
 755              p_sys->vid_cap.minheight, p_sys->vid_cap.maxheight );
 756
 757     if( p_sys->i_channel < 0 || p_sys->i_channel >= p_sys->vid_cap.channels )
 758     {
 759         msg_Dbg( p_demux, "invalid channel, falling back on channel 0" );
 760         p_sys->i_channel = 0;
 761     }
 762     if( p_sys->i_audio >= p_sys->vid_cap.audios )
 763     {
 764         msg_Dbg( p_demux, "invalid audio, falling back with no audio" );
 765         p_sys->i_audio = -1;
 766     }
 767
 768     if( p_sys->i_width < p_sys->vid_cap.minwidth ||
 769         p_sys->i_width > p_sys->vid_cap.maxwidth )
 770     {
 771         msg_Dbg( p_demux, "invalid width %i", p_sys->i_width );
 772         p_sys->i_width = 0;
 773     }
 774     if( p_sys->i_height < p_sys->vid_cap.minheight ||
 775         p_sys->i_height > p_sys->vid_cap.maxheight )
 776     {
 777         msg_Dbg( p_demux, "invalid height %i", p_sys->i_height );
 778         p_sys->i_height = 0;
 779     }
 780
 781     if( !( p_sys->vid_cap.type & VID_TYPE_CAPTURE ) )
 782     {
 783         msg_Err( p_demux, "cannot grab" );
 784         goto vdev_failed;
 785     }
 786
 787     vid_channel.channel = p_sys->i_channel;
 788     if( ioctl( i_fd, VIDIOCGCHAN, &vid_channel ) < 0 )
 789     {
 790         msg_Err( p_demux, "cannot get channel infos (%s)",
 791                           strerror( errno ) );
 792         goto vdev_failed;
 793     }
 794     msg_Dbg( p_demux,
 795              "setting channel %s(%d) %d tuners flags=0x%x type=0x%x norm=0x%x",
 796              vid_channel.name, vid_channel.channel, vid_channel.tuners,
 797              vid_channel.flags, vid_channel.type, vid_channel.norm );
 798
 799     if( p_sys->i_tuner >= vid_channel.tuners )
 800     {
 801         msg_Dbg( p_demux, "invalid tuner, falling back on tuner 0" );
 802         p_sys->i_tuner = 0;
 803     }
 804
 805     vid_channel.norm = p_sys->i_norm;
 806     if( ioctl( i_fd, VIDIOCSCHAN, &vid_channel ) < 0 )
 807     {
 808         msg_Err( p_demux, "cannot set channel (%s)", strerror( errno ) );
 809         goto vdev_failed;
 810     }
 811
 812     if( vid_channel.flags & VIDEO_VC_TUNER )
 813     {
 814
 815         /* set tuner */
 816 #if 0
 817         struct video_tuner vid_tuner;
 818         if( p_sys->i_tuner >= 0 )
 819         {
 820             vid_tuner.tuner = p_sys->i_tuner;
 821             if( ioctl( i_fd, VIDIOCGTUNER, &vid_tuner ) < 0 )
 822             {
 823                 msg_Err( p_demux, "cannot get tuner (%s)", strerror( errno ) );
 824                 goto vdev_failed;
 825             }
 826             msg_Dbg( p_demux, "tuner %s low=%d high=%d, flags=0x%x "
 827                      "mode=0x%x signal=0x%x",
 828                      vid_tuner.name, vid_tuner.rangelow, vid_tuner.rangehigh,
 829                      vid_tuner.flags, vid_tuner.mode, vid_tuner.signal );
 830
 831             msg_Dbg( p_demux, "setting tuner %s (%d)",
 832                      vid_tuner.name, vid_tuner.tuner );
 833
 834             /* FIXME FIXME to be checked FIXME FIXME */
 835             //vid_tuner.mode = p_sys->i_norm;
 836             if( ioctl( i_fd, VIDIOCSTUNER, &vid_tuner ) < 0 )
 837             {
 838                 msg_Err( p_demux, "cannot set tuner (%s)", strerror( errno ) );
 839                 goto vdev_failed;
 840             }
 841         }
 842 #endif
 843
 844         /* Show a warning if frequency is < than 30000.
 845          * User is certainly usint old syntax. */
 846
 847
 848         /* set frequency */
 849         if( p_sys->i_frequency >= 0 )
 850         {
 851             int driver_frequency = p_sys->i_frequency * 16 /1000;
 852             if( ioctl( i_fd, VIDIOCSFREQ, &driver_frequency ) < 0 )
 853             {
 854                 msg_Err( p_demux, "cannot set frequency (%s)",
 855                                   strerror( errno ) );
 856                 goto vdev_failed;
 857             }
 858             msg_Dbg( p_demux, "frequency %d (%d)", p_sys->i_frequency,
 859                                                    driver_frequency );
 860         }
 861     }
 862
 863     /* set audio */
 864     if( vid_channel.flags & VIDEO_VC_AUDIO )
 865     {
 866         struct video_audio      vid_audio;
 867
 868         /* XXX TODO volume, balance, ... */
 869         if( p_sys->i_audio >= 0 )
 870         {
 871             vid_audio.audio = p_sys->i_audio;
 872             if( ioctl( i_fd, VIDIOCGAUDIO, &vid_audio ) < 0 )
 873             {
 874                 msg_Err( p_demux, "cannot get audio (%s)", strerror( errno ) );
 875                 goto vdev_failed;
 876             }
 877
 878             /* unmute audio */
 879             vid_audio.flags &= ~VIDEO_AUDIO_MUTE;
 880
 881             if( ioctl( i_fd, VIDIOCSAUDIO, &vid_audio ) < 0 )
 882             {
 883                 msg_Err( p_demux, "cannot set audio (%s)", strerror( errno ) );
 884                 goto vdev_failed;
 885             }
 886         }
 887
 888     }
 889
 890     /* establish basic params with input and norm before feeling width
 891      * or height */
 892     if( p_sys->b_mjpeg )
 893     {
 894         struct quicktime_mjpeg_app1 *p_app1;
 895         int32_t i_offset;
 896
 897         if( ioctl( i_fd, MJPIOC_G_PARAMS, &mjpeg ) < 0 )
 898         {
 899             msg_Err( p_demux, "cannot get mjpeg params (%s)",
 900                               strerror( errno ) );
 901             goto vdev_failed;
 902         }
 903         mjpeg.input = p_sys->i_channel;
 904         mjpeg.norm  = p_sys->i_norm;
 905         mjpeg.decimation = p_sys->i_decimation;
 906
 907         if( p_sys->i_width )
 908             mjpeg.img_width = p_sys->i_width / p_sys->i_decimation;
 909         if( p_sys->i_height )
 910             mjpeg.img_height = p_sys->i_height / p_sys->i_decimation;
 911
 912         /* establish Quicktime APP1 marker while we are here */
 913         mjpeg.APPn = 1;
 914         mjpeg.APP_len = 40;
 915
 916         /* aligned */
 917         p_app1 = (struct quicktime_mjpeg_app1 *)mjpeg.APP_data;
 918         p_app1->i_reserved = 0;
 919         p_app1->i_tag = VLC_FOURCC( 'm','j','p','g' );
 920         p_app1->i_field_size = 0;
 921         p_app1->i_padded_field_size = 0;
 922         p_app1->i_next_field = 0;
 923         /* XXX WARNING XXX */
 924         /* these's nothing magic about these values.  We are dangerously
 925          * assuming the encoder card is encoding mjpeg-a and is not throwing
 926          * in marker tags we aren't expecting.  It's bad enough we have to
 927          * search through the jpeg output for every frame we grab just to
 928          * find the first field's end marker, so we take this risk to boost
 929          * performance.
 930          * This is really something the driver could do for us because this
 931          * does conform to standards outside of Apple Quicktime.
 932          */
 933         i_offset = 0x2e;
 934         p_app1->i_DQT_offset = hton32( i_offset );
 935         i_offset = 0xb4;
 936         p_app1->i_DHT_offset = hton32( i_offset );
 937         i_offset = 0x258;
 938         p_app1->i_SOF_offset = hton32( i_offset );
 939         i_offset = 0x26b;
 940         p_app1->i_SOS_offset = hton32( i_offset );
 941         i_offset = 0x279;
 942         p_app1->i_data_offset = hton32( i_offset );
 943
 944         /* SOF and SOS aren't specified by the mjpeg API because they aren't
 945          * optional.  They will be present in the output. */
 946         mjpeg.jpeg_markers = JPEG_MARKER_DHT | JPEG_MARKER_DQT;
 947
 948         if( ioctl( i_fd, MJPIOC_S_PARAMS, &mjpeg ) < 0 )
 949         {
 950             msg_Err( p_demux, "cannot set mjpeg params (%s)",
 951                               strerror( errno ) );
 952             goto vdev_failed;
 953         }
 954
 955         p_sys->i_width = mjpeg.img_width * mjpeg.HorDcm;
 956         p_sys->i_height = mjpeg.img_height * mjpeg.VerDcm *
 957             mjpeg.field_per_buff;
 958     }
 959
 960     /* fix width/height */
 961     if( !p_sys->b_mjpeg && ( p_sys->i_width == 0 || p_sys->i_height == 0 ) )
 962     {
 963         struct video_window vid_win;
 964
 965         if( ioctl( i_fd, VIDIOCGWIN, &vid_win ) < 0 )
 966         {
 967             msg_Err( p_demux, "cannot get win (%s)", strerror( errno ) );
 968             goto vdev_failed;
 969         }
 970         p_sys->i_width  = vid_win.width;
 971         p_sys->i_height = vid_win.height;
 972
 973         msg_Dbg( p_demux, "will use %dx%d", p_sys->i_width, p_sys->i_height );
 974     }
 975
 976     if( !p_sys->b_mjpeg )
 977     {
 978         /* set hue/color/.. */
 979         if( ioctl( i_fd, VIDIOCGPICT, &p_sys->vid_picture ) == 0 )
 980         {
 981             struct video_picture vid_picture = p_sys->vid_picture;
 982
 983             if( p_sys->i_brightness >= 0 && p_sys->i_brightness < 65536 )
 984             {
 985                 vid_picture.brightness = p_sys->i_brightness;
 986             }
 987             if( p_sys->i_colour >= 0 && p_sys->i_colour < 65536 )
 988             {
 989                 vid_picture.colour = p_sys->i_colour;
 990             }
 991             if( p_sys->i_hue >= 0 && p_sys->i_hue < 65536 )
 992             {
 993                 vid_picture.hue = p_sys->i_hue;
 994             }
 995             if( p_sys->i_contrast  >= 0 && p_sys->i_contrast < 65536 )
 996             {
 997                 vid_picture.contrast = p_sys->i_contrast;
 998             }
 999             if( ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
1000             {
1001                 msg_Dbg( p_demux, "v4l device uses brightness: %d",
1002                          vid_picture.brightness );
1003                 msg_Dbg( p_demux, "v4l device uses colour: %d",
1004                          vid_picture.colour );
1005                 msg_Dbg( p_demux, "v4l device uses hue: %d", vid_picture.hue );
1006                 msg_Dbg( p_demux, "v4l device uses contrast: %d",
1007                          vid_picture.contrast );
1008                 p_sys->vid_picture = vid_picture;
1009             }
1010         }
1011
1012         /* Find out video format used by device */
1013         if( ioctl( i_fd, VIDIOCGPICT, &p_sys->vid_picture ) == 0 )
1014         {
1015             struct video_picture vid_picture = p_sys->vid_picture;
1016             char *psz;
1017             int i;
1018
1019             vid_picture.palette = 0;
1020             p_sys->i_fourcc = 0;
1021
1022             psz = var_CreateGetString( p_demux, "v4l-chroma" );
1023             if( strlen( psz ) >= 4 )
1024             {
1025                 int i_chroma = VLC_FOURCC( psz[0], psz[1], psz[2], psz[3] );
1026
1027                 /* Find out v4l chroma code */
1028                 for( i = 0; v4lchroma_to_fourcc[i].i_v4l != 0; i++ )
1029                 {
1030                     if( v4lchroma_to_fourcc[i].i_fourcc == i_chroma )
1031                     {
1032                         vid_picture.palette = v4lchroma_to_fourcc[i].i_v4l;
1033                         break;
1034                     }
1035                 }
1036             }
1037             free( psz );
1038
1039             if( vid_picture.palette &&
1040                 !ioctl( i_fd, VIDIOCSPICT, &vid_picture ) )
1041             {
1042                 p_sys->vid_picture = vid_picture;
1043             }
1044             else
1045             {
1046                 /* Try to set the format to something easy to encode */
1047                 vid_picture.palette = VIDEO_PALETTE_YUV420P;
1048                 if( ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
1049                 {
1050                     p_sys->vid_picture = vid_picture;
1051                 }
1052                 else
1053                 {
1054                     vid_picture.palette = VIDEO_PALETTE_YUV422P;
1055                     if( ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
1056                     {
1057                         p_sys->vid_picture = vid_picture;
1058                     }
1059                 }
1060             }
1061
1062             /* Find out final format */
1063             for( i = 0; v4lchroma_to_fourcc[i].i_v4l != 0; i++ )
1064             {
1065                 if( v4lchroma_to_fourcc[i].i_v4l == p_sys->vid_picture.palette)
1066                 {
1067                     p_sys->i_fourcc = v4lchroma_to_fourcc[i].i_fourcc;
1068                     break;
1069                 }
1070             }
1071         }
1072         else
1073         {
1074             msg_Err( p_demux, "ioctl VIDIOCGPICT failed" );
1075             goto vdev_failed;
1076         }
1077     }
1078
1079     if( p_sys->b_mjpeg )
1080     {
1081         int i;
1082
1083         p_sys->mjpeg_buffers.count = 8;
1084         p_sys->mjpeg_buffers.size = MJPEG_BUFFER_SIZE;
1085
1086         if( ioctl( i_fd, MJPIOC_REQBUFS, &p_sys->mjpeg_buffers ) < 0 )
1087         {
1088             msg_Err( p_demux, "mmap unsupported" );
1089             goto vdev_failed;
1090         }
1091
1092         p_sys->p_video_mmap = mmap( 0,
1093                 p_sys->mjpeg_buffers.size * p_sys->mjpeg_buffers.count,
1094                 PROT_READ | PROT_WRITE, MAP_SHARED, i_fd, 0 );
1095         if( p_sys->p_video_mmap == MAP_FAILED )
1096         {
1097             msg_Err( p_demux, "mmap failed" );
1098             goto vdev_failed;
1099         }
1100
1101         p_sys->i_fourcc  = VLC_FOURCC( 'm','j','p','g' );
1102         p_sys->i_frame_pos = -1;
1103
1104         /* queue up all the frames */
1105         for( i = 0; i < (int)p_sys->mjpeg_buffers.count; i++ )
1106         {
1107             if( ioctl( i_fd, MJPIOC_QBUF_CAPT, &i ) < 0 )
1108             {
1109                 msg_Err( p_demux, "unable to queue frame" );
1110                 goto vdev_failed;
1111             }
1112         }
1113     }
1114     else
1115     {
1116         /* Fill in picture_t fields */
1117         vout_InitPicture( VLC_OBJECT(p_demux), &p_sys->pic, p_sys->i_fourcc,
1118                           p_sys->i_width, p_sys->i_height, p_sys->i_width *
1119                           VOUT_ASPECT_FACTOR / p_sys->i_height );
1120         if( !p_sys->pic.i_planes )
1121         {
1122             msg_Err( p_demux, "unsupported chroma" );
1123             goto vdev_failed;
1124         }
1125         p_sys->i_video_frame_size = 0;
1126         for( i = 0; i < p_sys->pic.i_planes; i++ )
1127         {
1128             p_sys->i_video_frame_size += p_sys->pic.p[i].i_visible_lines *
1129               p_sys->pic.p[i].i_visible_pitch;
1130         }
1131
1132         msg_Dbg( p_demux, "v4l device uses frame size: %i",
1133                  p_sys->i_video_frame_size );
1134         msg_Dbg( p_demux, "v4l device uses chroma: %4.4s",
1135                 (char*)&p_sys->i_fourcc );
1136
1137         /* Allocate mmap buffer */
1138         if( ioctl( i_fd, VIDIOCGMBUF, &p_sys->vid_mbuf ) < 0 )
1139         {
1140             msg_Err( p_demux, "mmap unsupported" );
1141             goto vdev_failed;
1142         }
1143
1144         p_sys->p_video_mmap = mmap( 0, p_sys->vid_mbuf.size,
1145                                     PROT_READ|PROT_WRITE, MAP_SHARED,
1146                                     i_fd, 0 );
1147         if( p_sys->p_video_mmap == MAP_FAILED )
1148         {
1149             /* FIXME -> normal read */
1150             msg_Err( p_demux, "mmap failed" );
1151             goto vdev_failed;
1152         }
1153
1154         /* init grabbing */
1155         p_sys->vid_mmap.frame  = 0;
1156         p_sys->vid_mmap.width  = p_sys->i_width;
1157         p_sys->vid_mmap.height = p_sys->i_height;
1158         p_sys->vid_mmap.format = p_sys->vid_picture.palette;
1159         if( ioctl( i_fd, VIDIOCMCAPTURE, &p_sys->vid_mmap ) < 0 )
1160         {
1161             msg_Warn( p_demux, "%4.4s refused", (char*)&p_sys->i_fourcc );
1162             msg_Err( p_demux, "chroma selection failed" );
1163             goto vdev_failed;
1164         }
1165     }
1166     return i_fd;
1167
1168 vdev_failed:
1169
1170     if( i_fd >= 0 ) close( i_fd );
1171     return -1;
1172 }
1173
1174 /*****************************************************************************
1175  * OpenAudioDev:
1176  *****************************************************************************/
1177 static int OpenAudioDev( demux_t *p_demux, char *psz_device )
1178 {
1179     demux_sys_t *p_sys = p_demux->p_sys;
1180     int i_fd, i_format;
1181
1182     if( (i_fd = open( psz_device, O_RDONLY | O_NONBLOCK )) < 0 )
1183     {
1184         msg_Err( p_demux, "cannot open audio device (%s)", strerror( errno ) );
1185         goto adev_fail;
1186     }
1187
1188     i_format = AFMT_S16_LE;
1189     if( ioctl( i_fd, SNDCTL_DSP_SETFMT, &i_format ) < 0
1190         || i_format != AFMT_S16_LE )
1191     {
1192         msg_Err( p_demux, "cannot set audio format (16b little endian) "
1193                  "(%s)", strerror( errno ) );
1194         goto adev_fail;
1195     }
1196
1197     if( ioctl( i_fd, SNDCTL_DSP_STEREO,
1198                &p_sys->b_stereo ) < 0 )
1199     {
1200         msg_Err( p_demux, "cannot set audio channels count (%s)",
1201                  strerror( errno ) );
1202         goto adev_fail;
1203     }
1204
1205     if( ioctl( i_fd, SNDCTL_DSP_SPEED,
1206                &p_sys->i_sample_rate ) < 0 )
1207     {
1208         msg_Err( p_demux, "cannot set audio sample rate (%s)",
1209                  strerror( errno ) );
1210         goto adev_fail;
1211     }
1212
1213     msg_Dbg( p_demux, "openened adev=`%s' %s %dHz",
1214              psz_device, p_sys->b_stereo ? "stereo" : "mono",
1215              p_sys->i_sample_rate );
1216
1217     p_sys->i_audio_max_frame_size = 6 * 1024;
1218
1219     return i_fd;
1220
1221  adev_fail:
1222
1223     if( i_fd >= 0 ) close( i_fd );
1224     return -1;
1225 }
1226
1227 /*****************************************************************************
1228  * GrabAudio: grab audio
1229  *****************************************************************************/
1230 static block_t *GrabAudio( demux_t *p_demux )
1231 {
1232     demux_sys_t *p_sys = p_demux->p_sys;
1233     struct audio_buf_info buf_info;
1234     int i_read, i_correct;
1235     block_t *p_block;
1236
1237     if( p_sys->p_block_audio ) p_block = p_sys->p_block_audio;
1238     else p_block = block_New( p_demux, p_sys->i_audio_max_frame_size );
1239
1240     if( !p_block )
1241     {
1242         msg_Warn( p_demux, "cannot get block" );
1243         return 0;
1244     }
1245
1246     p_sys->p_block_audio = p_block;
1247
1248     i_read = read( p_sys->fd_audio, p_block->p_buffer,
1249                    p_sys->i_audio_max_frame_size );
1250
1251     if( i_read <= 0 ) return 0;
1252
1253     p_block->i_buffer = i_read;
1254     p_sys->p_block_audio = 0;
1255
1256     /* Correct the date because of kernel buffering */
1257     i_correct = i_read;
1258     if( ioctl( p_sys->fd_audio, SNDCTL_DSP_GETISPACE, &buf_info ) == 0 )
1259     {
1260         i_correct += buf_info.bytes;
1261     }
1262
1263     p_block->i_pts = p_block->i_dts =
1264         mdate() - I64C(1000000) * (mtime_t)i_correct /
1265         2 / ( p_sys->b_stereo ? 2 : 1) / p_sys->i_sample_rate;
1266
1267     return p_block;
1268 }
1269
1270 /*****************************************************************************
1271  * GrabVideo:
1272  *****************************************************************************/
1273 static uint8_t *GrabCapture( demux_t *p_demux )
1274 {
1275     demux_sys_t *p_sys = p_demux->p_sys;
1276     int i_captured_frame = p_sys->i_frame_pos;
1277
1278     p_sys->vid_mmap.frame = (p_sys->i_frame_pos + 1) % p_sys->vid_mbuf.frames;
1279
1280     while( ioctl( p_sys->fd_video, VIDIOCMCAPTURE, &p_sys->vid_mmap ) < 0 )
1281     {
1282         if( errno != EAGAIN )
1283         {
1284             msg_Err( p_demux, "failed capturing new frame" );
1285             return NULL;
1286         }
1287
1288         if( p_demux->b_die )
1289         {
1290             return NULL;
1291         }
1292
1293         msg_Dbg( p_demux, "grab failed, trying again" );
1294     }
1295
1296     while( ioctl(p_sys->fd_video, VIDIOCSYNC, &p_sys->i_frame_pos) < 0 )
1297     {
1298         if( errno != EAGAIN && errno != EINTR )
1299         {
1300             msg_Err( p_demux, "failed syncing new frame" );
1301             return NULL;
1302         }
1303     }
1304
1305     p_sys->i_frame_pos = p_sys->vid_mmap.frame;
1306     /* leave i_video_frame_size alone */
1307     return p_sys->p_video_mmap + p_sys->vid_mbuf.offsets[i_captured_frame];
1308 }
1309
1310 static uint8_t *GrabMJPEG( demux_t *p_demux )
1311 {
1312     demux_sys_t *p_sys = p_demux->p_sys;
1313     struct mjpeg_sync sync;
1314     uint8_t *p_frame, *p_field, *p;
1315     uint16_t tag;
1316     uint32_t i_size;
1317     struct quicktime_mjpeg_app1 *p_app1 = NULL;
1318
1319     /* re-queue the last frame we sync'd */
1320     if( p_sys->i_frame_pos != -1 )
1321     {
1322         while( ioctl( p_sys->fd_video, MJPIOC_QBUF_CAPT,
1323                                        &p_sys->i_frame_pos ) < 0 )
1324         {
1325             if( errno != EAGAIN && errno != EINTR )
1326             {
1327                 msg_Err( p_demux, "failed capturing new frame" );
1328                 return NULL;
1329             }
1330         }
1331     }
1332
1333     /* sync on the next frame */
1334     while( ioctl( p_sys->fd_video, MJPIOC_SYNC, &sync ) < 0 )
1335     {
1336         if( errno != EAGAIN && errno != EINTR )
1337         {
1338             msg_Err( p_demux, "failed syncing new frame" );
1339             return NULL;
1340         }
1341     }
1342
1343     p_sys->i_frame_pos = sync.frame;
1344     p_frame = p_sys->p_video_mmap + p_sys->mjpeg_buffers.size * sync.frame;
1345
1346     /* p_frame now points to the data.  fix up the Quicktime APP1 marker */
1347     tag = 0xffd9;
1348     tag = hton16( tag );
1349     p_field = p_frame;
1350
1351     /* look for EOI */
1352     p = memmem( p_field, sync.length, &tag, 2 );
1353
1354     if( p )
1355     {
1356         p += 2; /* data immediately following EOI */
1357         /* UNALIGNED! */
1358         p_app1 = (struct quicktime_mjpeg_app1 *)(p_field + 6);
1359
1360         i_size = ((uint32_t)(p - p_field));
1361         i_size = hton32( i_size );
1362         memcpy( &p_app1->i_field_size, &i_size, 4 );
1363
1364         while( *p == 0xff && *(p+1) == 0xff )
1365             p++;
1366
1367         i_size = ((uint32_t)(p - p_field));
1368         i_size = hton32( i_size );
1369         memcpy( &p_app1->i_padded_field_size, &i_size, 4 );
1370     }
1371
1372     tag = 0xffd8;
1373     tag = hton16( tag );
1374     p_field = memmem( p, sync.length - (size_t)(p - p_frame), &tag, 2 );
1375
1376     if( p_field )
1377     {
1378         i_size = (uint32_t)(p_field - p_frame);
1379         i_size = hton32( i_size );
1380         memcpy( &p_app1->i_next_field, &i_size, 4 );
1381
1382         /* UNALIGNED! */
1383         p_app1 = (struct quicktime_mjpeg_app1 *)(p_field + 6);
1384         tag = 0xffd9;
1385         tag = hton16( tag );
1386         p = memmem( p_field, sync.length - (size_t)(p_field - p_frame),
1387                 &tag, 2 );
1388
1389         if( !p )
1390         {
1391             /* sometimes the second field doesn't have the EOI.  just put it
1392              * there
1393              */
1394             p = p_frame + sync.length;
1395             memcpy( p, &tag, 2 );
1396             sync.length += 2;
1397         }
1398
1399         p += 2;
1400         i_size = (uint32_t)(p - p_field);
1401         i_size = hton32( i_size );
1402         memcpy( &p_app1->i_field_size, &i_size, 4 );
1403         i_size = (uint32_t)(sync.length - (uint32_t)(p_field - p_frame));
1404         i_size = hton32( i_size );
1405         memcpy( &p_app1->i_padded_field_size, &i_size, 4 );
1406     }
1407
1408     p_sys->i_video_frame_size = sync.length;
1409     return p_frame;
1410 }
1411
1412 static block_t *GrabVideo( demux_t *p_demux )
1413 {
1414     demux_sys_t *p_sys = p_demux->p_sys;
1415     uint8_t     *p_frame;
1416     block_t     *p_block;
1417
1418     if( p_sys->f_fps >= 0.1 && p_sys->i_video_pts > 0 )
1419     {
1420         mtime_t i_dur = (mtime_t)((double)1000000 / (double)p_sys->f_fps);
1421
1422         /* Did we wait long enough ? (frame rate reduction) */
1423         if( p_sys->i_video_pts + i_dur > mdate() ) return 0;
1424     }
1425
1426     if( p_sys->b_mjpeg ) p_frame = GrabMJPEG( p_demux );
1427     else p_frame = GrabCapture( p_demux );
1428
1429     if( !p_frame ) return 0;
1430
1431     if( !( p_block = block_New( p_demux, p_sys->i_video_frame_size ) ) )
1432     {
1433         msg_Warn( p_demux, "cannot get block" );
1434         return 0;
1435     }
1436
1437     memcpy( p_block->p_buffer, p_frame, p_sys->i_video_frame_size );
1438     p_sys->i_video_pts = p_block->i_pts = p_block->i_dts = mdate();
1439
1440     return p_block;
1441 }