git.sesse.net Git - vlc/blob - modules/access/v4l2.c

   1 /*****************************************************************************
   2  * v4l2.c : Video4Linux2 input module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2002-2007 the VideoLAN team
   5  * $Id$
   6  *
   7  * Author: Benjamin Pracht <bigben at videolan dot org>
   8  *         Richard Hosking <richard at hovis dot net>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 /*
  26  * Sections based on the reference V4L2 capture example at
  27  * http://v4l2spec.bytesex.org/spec/capture-example.html
  28  */
  29
  30 /*
  31  * TODO: No mjpeg support yet.
  32  * TODO: Tuner partial implementation.
  33  * TODO: Alsa input support?
  34  */
  35
  36 /*****************************************************************************
  37  * Preamble
  38  *****************************************************************************/
  39
  40 #include <vlc/vlc.h>
  41 #include <vlc_access.h>
  42 #include <vlc_demux.h>
  43 #include <vlc_input.h>
  44 #include <vlc_vout.h>
  45
  46 #include <fcntl.h>
  47 #include <unistd.h>
  48 #include <sys/ioctl.h>
  49 #include <sys/mman.h>
  50
  51 #include <linux/videodev2.h>
  52
  53 #include <sys/soundcard.h>
  54
  55 /*****************************************************************************
  56  * Module descriptior
  57  *****************************************************************************/
  58
  59 static int  Open ( vlc_object_t * );
  60 static void Close( vlc_object_t * );
  61
  62 #define DEV_TEXT N_("Device name")
  63 #define DEV_LONGTEXT N_( \
  64     "Name of the device to use. " \
  65     "If you don't specify anything, /dev/video0 will be used.")
  66 #define ADEV_TEXT N_("Audio device name")
  67 #define ADEV_LONGTEXT N_( \
  68     "Name of the audio device to use. " \
  69     "If you don't specify anything, /dev/dsp will be used.")
  70 #define STANDARD_TEXT N_( "Standard" )
  71 #define STANDARD_LONGTEXT N_( \
  72     "Video standard (Default, SECAM, PAL, or NTSC)." )
  73 #define CHROMA_TEXT N_("Video input chroma format")
  74 #define CHROMA_LONGTEXT N_( \
  75     "Force the Video4Linux2 video device to use a specific chroma format " \
  76     "(eg. I420, RV24, etc.)")
  77 #define INPUT_TEXT N_( "Input" )
  78 #define INPUT_LONGTEXT N_( \
  79     "Input of the card to use (Usually, 0 = tuner, " \
  80     "1 = composite, 2 = svideo)." )
  81 #define IOMETHOD_TEXT N_( "IO Method" )
  82 #define IOMETHOD_LONGTEXT N_( \
  83     "IO Method (READ, MMAP, USERPTR)." )
  84 #define WIDTH_TEXT N_( "Width" )
  85 #define WIDTH_LONGTEXT N_( \
  86     "Force width (-1 for autodetect)." )
  87 #define HEIGHT_TEXT N_( "Height" )
  88 #define HEIGHT_LONGTEXT N_( \
  89     "Force height (-1 for autodetect)." )
  90 #define FPS_TEXT N_( "Framerate" )
  91 #define FPS_LONGTEXT N_( "Framerate to capture, if applicable " \
  92     "(-1 for autodetect)." )
  93 #define STEREO_TEXT N_( "Stereo" )
  94 #define STEREO_LONGTEXT N_( \
  95     "Capture the audio stream in stereo." )
  96 #define SAMPLERATE_TEXT N_( "Samplerate" )
  97 #define SAMPLERATE_LONGTEXT N_( \
  98     "Samplerate of the captured audio stream, in Hz (eg: 11025, 22050, 44100, 48000)" )
  99 #define CACHING_TEXT N_("Caching value in ms")
 100 #define CACHING_LONGTEXT N_( \
 101     "Caching value for V4L2 captures. This " \
 102     "value should be set in milliseconds." )
 103
 104 typedef enum {
 105     IO_METHOD_READ,
 106     IO_METHOD_MMAP,
 107     IO_METHOD_USERPTR,
 108 } io_method;
 109
 110 static int i_standards_list[] =
 111     { V4L2_STD_UNKNOWN, V4L2_STD_SECAM, V4L2_STD_PAL, V4L2_STD_NTSC };
 112 static const char *psz_standards_list_text[] =
 113     { N_("Default"), N_("SECAM"), N_("PAL"),  N_("NTSC") };
 114
 115 static int i_iomethod_list[] =
 116     { IO_METHOD_READ, IO_METHOD_MMAP, IO_METHOD_USERPTR };
 117 static const char *psz_iomethod_list_text[] =
 118     { N_("READ"), N_("MMAP"),  N_("USERPTR") };
 119
 120 vlc_module_begin();
 121     set_shortname( _("Video4Linux2") );
 122     set_description( _("Video4Linux2 input") );
 123     set_category( CAT_INPUT );
 124     set_subcategory( SUBCAT_INPUT_ACCESS );
 125
 126     add_string( "v4l2-dev", "/dev/video0", 0, DEV_TEXT, DEV_LONGTEXT,
 127                 VLC_FALSE );
 128     add_string( "v4l2-adev", "/dev/dsp", 0, ADEV_TEXT, ADEV_LONGTEXT,
 129                 VLC_FALSE );
 130     add_integer( "v4l2-standard", 0, NULL, STANDARD_TEXT, STANDARD_LONGTEXT,
 131                 VLC_FALSE );
 132         change_integer_list( i_standards_list, psz_standards_list_text, 0 );
 133     add_string( "v4l2-chroma", NULL, NULL, CHROMA_TEXT, CHROMA_LONGTEXT,
 134                 VLC_TRUE );
 135     add_integer( "v4l2-input", 0, NULL, INPUT_TEXT, INPUT_LONGTEXT,
 136                 VLC_TRUE );
 137     add_integer( "v4l2-io", IO_METHOD_MMAP, NULL, IOMETHOD_TEXT,
 138                  IOMETHOD_LONGTEXT, VLC_TRUE );
 139         change_integer_list( i_iomethod_list, psz_iomethod_list_text, 0 );
 140     add_integer( "v4l2-width", 0, NULL, WIDTH_TEXT,
 141                 WIDTH_LONGTEXT, VLC_TRUE );
 142     add_integer( "v4l2-height", 0, NULL, HEIGHT_TEXT,
 143                 HEIGHT_LONGTEXT, VLC_TRUE );
 144     add_float( "v4l2-fps", 0, NULL, FPS_TEXT, FPS_LONGTEXT, VLC_TRUE );
 145     add_bool( "v4l2-stereo", VLC_TRUE, NULL, STEREO_TEXT, STEREO_LONGTEXT,
 146                 VLC_TRUE );
 147     add_integer( "v4l2-samplerate", 48000, NULL, SAMPLERATE_TEXT,
 148                 SAMPLERATE_LONGTEXT, VLC_TRUE );
 149     add_integer( "v4l2-caching", DEFAULT_PTS_DELAY / 1000, NULL,
 150                 CACHING_TEXT, CACHING_LONGTEXT, VLC_TRUE );
 151
 152     add_shortcut( "v4l2" );
 153     set_capability( "access_demux", 10 );
 154     set_callbacks( Open, Close );
 155 vlc_module_end();
 156
 157 /*****************************************************************************
 158  * Access: local prototypes
 159  *****************************************************************************/
 160
 161 static void ParseMRL( demux_t * );
 162
 163 static int Control( demux_t *, int, va_list );
 164
 165 static int Demux( demux_t * );
 166 static block_t* GrabVideo( demux_t *p_demux );
 167 static block_t* ProcessVideoFrame( demux_t *p_demux, uint8_t *p_frame );
 168 static block_t* GrabAudio( demux_t *p_demux );
 169
 170 vlc_bool_t IsPixelFormatSupported( demux_t *p_demux, unsigned int i_pixelformat );
 171
 172 static int OpenVideoDev( demux_t *, char *psz_device );
 173 static int OpenAudioDev( demux_t *, char *psz_device );
 174 static vlc_bool_t ProbeVideoDev( demux_t *, char *psz_device );
 175 static vlc_bool_t ProbeAudioDev( demux_t *, char *psz_device );
 176
 177 static struct
 178 {
 179     unsigned int i_v4l2;
 180     int i_fourcc;
 181 } v4l2chroma_to_fourcc[] =
 182 {
 183     { V4L2_PIX_FMT_GREY, VLC_FOURCC( 'G', 'R', 'E', 'Y' ) },
 184     { V4L2_PIX_FMT_HI240, VLC_FOURCC( 'I', '2', '4', '0' ) },
 185     { V4L2_PIX_FMT_RGB565, VLC_FOURCC( 'R', 'V', '1', '6' ) },
 186     { V4L2_PIX_FMT_RGB555, VLC_FOURCC( 'R', 'V', '1', '5' ) },
 187     { V4L2_PIX_FMT_BGR24, VLC_FOURCC( 'R', 'V', '2', '4' ) },
 188     { V4L2_PIX_FMT_BGR32, VLC_FOURCC( 'R', 'V', '3', '2' ) },
 189     { V4L2_PIX_FMT_YUYV, VLC_FOURCC( 'Y', 'U', 'Y', '2' ) },
 190     { V4L2_PIX_FMT_YUYV, VLC_FOURCC( 'Y', 'U', 'Y', 'V' ) },
 191     { V4L2_PIX_FMT_UYVY, VLC_FOURCC( 'U', 'Y', 'V', 'Y' ) },
 192     { V4L2_PIX_FMT_Y41P, VLC_FOURCC( 'I', '4', '1', 'N' ) },
 193     { V4L2_PIX_FMT_YUV422P, VLC_FOURCC( 'I', '4', '2', '2' ) },
 194     { V4L2_PIX_FMT_YVU420, VLC_FOURCC( 'I', '4', '2', '0' ) },
 195     { V4L2_PIX_FMT_YUV411P, VLC_FOURCC( 'I', '4', '1', '1' ) },
 196     { V4L2_PIX_FMT_YUV410, VLC_FOURCC( 'I', '4', '1', '0' ) },
 197     { 0, 0 }
 198 };
 199
 200 struct buffer_t
 201 {
 202     void *  start;
 203     size_t  length;
 204     void *  orig_userp;
 205 };
 206
 207 struct demux_sys_t
 208 {
 209     char *psz_device;  /* Main device from MRL, can be video or audio */
 210
 211     char *psz_vdev;
 212     int  i_fd_video;
 213
 214     char *psz_adev;
 215     int  i_fd_audio;
 216
 217     char *psz_requested_chroma;
 218
 219     /* Video */
 220     io_method io;
 221
 222     int i_pts;
 223
 224     struct v4l2_capability dev_cap;
 225
 226     int i_input;
 227     struct v4l2_input *p_inputs;
 228     int i_selected_input;
 229
 230     int i_standard;
 231     struct v4l2_standard *p_standards;
 232     v4l2_std_id i_selected_standard_id;
 233
 234     int i_audio;
 235     /* V4L2 devices cannot have more than 32 audio inputs */
 236     struct v4l2_audio p_audios[32];
 237
 238     int i_tuner;
 239     struct v4l2_tuner *p_tuners;
 240
 241     int i_codec;
 242     struct v4l2_fmtdesc *p_codecs;
 243
 244     struct buffer_t *p_buffers;
 245     unsigned int i_nbuffers;
 246
 247     int i_width;
 248     int i_height;
 249     float f_fps;            /* <= 0.0 mean to grab at full rate */
 250     mtime_t i_video_pts;    /* only used when f_fps > 0 */
 251     int i_fourcc;
 252
 253     picture_t pic;
 254     int i_video_frame_size;
 255
 256     es_out_id_t *p_es_video;
 257
 258     /* Audio */
 259     int i_sample_rate;
 260     vlc_bool_t b_stereo;
 261     int i_audio_max_frame_size;
 262     block_t *p_block_audio;
 263     es_out_id_t *p_es_audio;
 264 };
 265
 266 /*****************************************************************************
 267  * Open: opens v4l2 device
 268  *****************************************************************************
 269  *
 270  * url: <video device>::::
 271  *
 272  *****************************************************************************/
 273 static int Open( vlc_object_t *p_this )
 274 {
 275     demux_t     *p_demux = (demux_t*)p_this;
 276     demux_sys_t *p_sys;
 277     vlc_value_t val;
 278
 279     /* Only when selected */
 280     if( *p_demux->psz_access == '\0' ) return VLC_EGENERIC;
 281
 282     /* Set up p_demux */
 283     p_demux->pf_control = Control;
 284     p_demux->pf_demux = Demux;
 285     p_demux->info.i_update = 0;
 286     p_demux->info.i_title = 0;
 287     p_demux->info.i_seekpoint = 0;
 288
 289     p_demux->p_sys = p_sys = calloc( 1, sizeof( demux_sys_t ) );
 290     if( p_sys == NULL ) return VLC_ENOMEM;
 291
 292     p_sys->i_video_pts = -1;
 293
 294     var_Create( p_demux, "v4l2-standard", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 295     var_Get( p_demux, "v4l2-standard", &val );
 296     p_sys->i_selected_standard_id = i_standards_list[val.i_int];
 297
 298     p_sys->i_selected_input = var_CreateGetInteger( p_demux, "v4l2-input" );
 299
 300     p_sys->io = var_CreateGetInteger( p_demux, "v4l2-io" );
 301
 302     p_sys->i_width = var_CreateGetInteger( p_demux, "v4l2-width" );
 303     p_sys->i_height = var_CreateGetInteger( p_demux, "v4l2-height" );
 304
 305     var_Create( p_demux, "v4l2-fps", VLC_VAR_FLOAT | VLC_VAR_DOINHERIT );
 306     var_Get( p_demux, "v4l2-fps", &val );
 307     p_sys->f_fps = val.f_float;
 308
 309     var_Create( p_demux, "v4l2-samplerate", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 310     var_Get( p_demux, "v4l2-samplerate", &val );
 311     p_sys->i_sample_rate = val.i_int;
 312
 313     p_sys->psz_requested_chroma = var_CreateGetString( p_demux, "v4l2-chroma" );
 314
 315     var_Create( p_demux, "v4l2-stereo", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
 316     var_Get( p_demux, "v4l2-stereo", &val );
 317     p_sys->b_stereo = val.b_bool;
 318
 319     p_sys->i_pts = var_CreateGetInteger( p_demux, "v4l2-caching" );
 320
 321     p_sys->psz_device = p_sys->psz_vdev = p_sys->psz_adev = NULL;
 322     p_sys->i_fd_video = -1;
 323     p_sys->i_fd_audio = -1;
 324
 325     p_sys->p_es_video = p_sys->p_es_audio = 0;
 326     p_sys->p_block_audio = 0;
 327
 328     ParseMRL( p_demux );
 329
 330     /* Find main device (video or audio) */
 331     if( p_sys->psz_device && *p_sys->psz_device )
 332     {
 333         msg_Dbg( p_demux, "main device='%s'", p_sys->psz_device );
 334
 335         /* Try to open as video device */
 336         msg_Dbg( p_demux, "trying device '%s' as video", p_sys->psz_device );
 337         if( ProbeVideoDev( p_demux, p_sys->psz_device ) )
 338         {
 339             msg_Dbg( p_demux, "'%s' is a video device", p_sys->psz_device );
 340             /* Device was a video device */
 341             if( p_sys->psz_vdev ) free( p_sys->psz_vdev );
 342             p_sys->psz_vdev = p_sys->psz_device;
 343             p_sys->psz_device = NULL;
 344             p_sys->i_fd_video = OpenVideoDev( p_demux, p_sys->psz_vdev );
 345             if( p_sys->i_fd_video < 0 )
 346             {
 347                 Close( p_this );
 348                 return VLC_EGENERIC;
 349             }
 350         }
 351         else
 352         {
 353             /* Try to open as audio device */
 354             msg_Dbg( p_demux, "trying device '%s' as audio", p_sys->psz_device );
 355             if( ProbeAudioDev( p_demux, p_sys->psz_device ) )
 356             {
 357                 msg_Dbg( p_demux, "'%s' is an audio device", p_sys->psz_device );
 358                 /* Device was an audio device */
 359                 if( p_sys->psz_adev ) free( p_sys->psz_adev );
 360                 p_sys->psz_adev = p_sys->psz_device;
 361                 p_sys->psz_device = NULL;
 362                 p_sys->i_fd_audio = OpenAudioDev( p_demux, p_sys->psz_adev );
 363                 if( p_sys->i_fd_audio < 0 )
 364                 {
 365                     Close( p_this );
 366                     return VLC_EGENERIC;
 367                 }
 368             }
 369         }
 370     }
 371
 372     /* If no device opened, only continue if the access was forced */
 373     if( p_sys->i_fd_video < 0 && p_sys->i_fd_audio < 0 )
 374     {
 375         if( strcmp( p_demux->psz_access, "v4l2" ) )
 376         {
 377             Close( p_this );
 378             return VLC_EGENERIC;
 379         }
 380     }
 381
 382     /* Find video device */
 383     if( p_sys->i_fd_video < 0 )
 384     {
 385         if( !p_sys->psz_vdev || !*p_sys->psz_vdev )
 386         {
 387             if( p_sys->psz_vdev ) free( p_sys->psz_vdev );
 388             p_sys->psz_vdev = var_CreateGetString( p_demux, "v4l2-dev" );
 389         }
 390
 391         msg_Dbg( p_demux, "opening '%s' as video", p_sys->psz_vdev );
 392         if( p_sys->psz_vdev && *p_sys->psz_vdev && ProbeVideoDev( p_demux, p_sys->psz_vdev ) )
 393         {
 394             p_sys->i_fd_video = OpenVideoDev( p_demux, p_sys->psz_vdev );
 395         }
 396     }
 397
 398     /* Find audio device */
 399     if( p_sys->i_fd_audio < 0 )
 400     {
 401         if( !p_sys->psz_adev || !*p_sys->psz_adev )
 402         {
 403             if( p_sys->psz_adev ) free( p_sys->psz_adev );
 404             p_sys->psz_adev = var_CreateGetString( p_demux, "v4l2-adev" );
 405         }
 406
 407         msg_Dbg( p_demux, "opening '%s' as audio", p_sys->psz_adev );
 408         if( p_sys->psz_adev && *p_sys->psz_adev && ProbeAudioDev( p_demux, p_sys->psz_adev ) )
 409         {
 410             p_sys->i_fd_audio = OpenAudioDev( p_demux, p_sys->psz_adev );
 411         }
 412     }
 413
 414     if( p_sys->i_fd_video < 0 && p_sys->i_fd_audio < 0 )
 415     {
 416         Close( p_this );
 417         return VLC_EGENERIC;
 418     }
 419
 420     return VLC_SUCCESS;
 421 }
 422
 423 /*****************************************************************************
 424  * ParseMRL: parse the options contained in the MRL
 425  *****************************************************************************/
 426 static void ParseMRL( demux_t *p_demux )
 427 {
 428     demux_sys_t *p_sys = p_demux->p_sys;
 429
 430     char *psz_dup = strdup( p_demux->psz_path );
 431     char *psz_parser = psz_dup;
 432
 433     while( *psz_parser && *psz_parser != ':' )
 434     {
 435         psz_parser++;
 436     }
 437
 438     if( *psz_parser == ':' )
 439     {
 440         /* read options */
 441         for( ;; )
 442         {
 443             *psz_parser++ = '\0';
 444
 445             if( !strncmp( psz_parser, "adev=", strlen( "adev=" ) ) )
 446             {
 447                 int  i_len;
 448
 449                 psz_parser += strlen( "adev=" );
 450                 if( strchr( psz_parser, ':' ) )
 451                 {
 452                     i_len = strchr( psz_parser, ':' ) - psz_parser;
 453                 }
 454                 else
 455                 {
 456                     i_len = strlen( psz_parser );
 457                 }
 458
 459                 p_sys->psz_adev = strndup( psz_parser, i_len );
 460
 461                 psz_parser += i_len;
 462             }
 463             else if( !strncmp( psz_parser, "standard=", strlen( "standard=" ) ) )
 464             {
 465                 psz_parser += strlen( "standard=" );
 466                 if( !strncmp( psz_parser, "pal", strlen( "pal" ) ) )
 467                 {
 468                     p_sys->i_selected_standard_id = V4L2_STD_PAL;
 469                     psz_parser += strlen( "pal" );
 470                 }
 471                 else if( !strncmp( psz_parser, "ntsc", strlen( "ntsc" ) ) )
 472                 {
 473                     p_sys->i_selected_standard_id = V4L2_STD_NTSC;
 474                     psz_parser += strlen( "ntsc" );
 475                 }
 476                 else if( !strncmp( psz_parser, "secam", strlen( "secam" ) ) )
 477                 {
 478                     p_sys->i_selected_standard_id = V4L2_STD_SECAM;
 479                     psz_parser += strlen( "secam" );
 480                 }
 481                 else if( !strncmp( psz_parser, "default", strlen( "default" ) ) )
 482                 {
 483                     p_sys->i_selected_standard_id = V4L2_STD_UNKNOWN;
 484                     psz_parser += strlen( "default" );
 485                 }
 486                 else
 487                 {
 488                     p_sys->i_selected_standard_id = i_standards_list[strtol( psz_parser, &psz_parser, 0 )];
 489                 }
 490             }
 491             else if( !strncmp( psz_parser, "chroma=", strlen( "chroma=" ) ) )
 492             {
 493                 int  i_len;
 494
 495                 psz_parser += strlen( "chroma=" );
 496                 if( strchr( psz_parser, ':' ) )
 497                 {
 498                     i_len = strchr( psz_parser, ':' ) - psz_parser;
 499                 }
 500                 else
 501                 {
 502                     i_len = strlen( psz_parser );
 503                 }
 504
 505                 if( p_sys->psz_requested_chroma ) free( p_sys->psz_requested_chroma );
 506                 p_sys->psz_requested_chroma = strndup( psz_parser, i_len );
 507
 508                 psz_parser += i_len;
 509             }
 510             else if( !strncmp( psz_parser, "input=", strlen( "input=" ) ) )
 511             {
 512                 p_sys->i_selected_input = strtol( psz_parser + strlen( "input=" ),
 513                                        &psz_parser, 0 );
 514             }
 515             else if( !strncmp( psz_parser, "fps=", strlen( "fps=" ) ) )
 516             {
 517                 p_sys->f_fps = strtof( psz_parser + strlen( "fps=" ),
 518                                        &psz_parser );
 519             }
 520             else if( !strncmp( psz_parser, "io=", strlen( "io=" ) ) )
 521             {
 522                 psz_parser += strlen( "io=" );
 523                 if( !strncmp( psz_parser, "read", strlen( "read" ) ) )
 524                 {
 525                     p_sys->io = IO_METHOD_READ;
 526                     psz_parser += strlen( "read" );
 527                 }
 528                 else if( !strncmp( psz_parser, "mmap", strlen( "mmap" ) ) )
 529                 {
 530                     p_sys->io = IO_METHOD_MMAP;
 531                     psz_parser += strlen( "mmap" );
 532                 }
 533                 else if( !strncmp( psz_parser, "userptr", strlen( "userptr" ) ) )
 534                 {
 535                     p_sys->io = IO_METHOD_USERPTR;
 536                     psz_parser += strlen( "userptr" );
 537                 }
 538                 else
 539                 {
 540                     p_sys->io = strtol( psz_parser, &psz_parser, 0 );
 541                 }
 542             }
 543             else if( !strncmp( psz_parser, "width=",
 544                                strlen( "width=" ) ) )
 545             {
 546                 p_sys->i_width =
 547                     strtol( psz_parser + strlen( "width=" ),
 548                             &psz_parser, 0 );
 549             }
 550             else if( !strncmp( psz_parser, "height=",
 551                                strlen( "height=" ) ) )
 552             {
 553                 p_sys->i_height =
 554                     strtol( psz_parser + strlen( "height=" ),
 555                             &psz_parser, 0 );
 556             }
 557             else if( !strncmp( psz_parser, "samplerate=",
 558                                strlen( "samplerate=" ) ) )
 559             {
 560                 p_sys->i_sample_rate =
 561                     strtol( psz_parser + strlen( "samplerate=" ),
 562                             &psz_parser, 0 );
 563             }
 564             else if( !strncmp( psz_parser, "stereo", strlen( "stereo" ) ) )
 565             {
 566                 psz_parser += strlen( "stereo" );
 567                 p_sys->b_stereo = VLC_TRUE;
 568             }
 569             else if( !strncmp( psz_parser, "mono", strlen( "mono" ) ) )
 570             {
 571                 psz_parser += strlen( "mono" );
 572                 p_sys->b_stereo = VLC_FALSE;
 573             }
 574             else if( !strncmp( psz_parser, "caching=", strlen( "caching=" ) ) )
 575             {
 576                 p_sys->i_pts = strtol( psz_parser + strlen( "caching=" ),
 577                                        &psz_parser, 0 );
 578             }
 579             else
 580             {
 581                 msg_Warn( p_demux, "unknown option" );
 582             }
 583
 584             while( *psz_parser && *psz_parser != ':' )
 585             {
 586                 psz_parser++;
 587             }
 588
 589             if( *psz_parser == '\0' )
 590             {
 591                 break;
 592             }
 593         }
 594     }
 595
 596     /* Main device */
 597     if( *psz_dup )
 598     {
 599         p_sys->psz_device = strdup( psz_dup );
 600     }
 601     if( psz_dup ) free( psz_dup );
 602 }
 603
 604 /*****************************************************************************
 605  * Close: close device, free resources
 606  *****************************************************************************/
 607 static void Close( vlc_object_t *p_this )
 608 {
 609     demux_t     *p_demux = (demux_t *)p_this;
 610     demux_sys_t *p_sys   = p_demux->p_sys;
 611     struct v4l2_buffer buf;
 612     enum v4l2_buf_type buf_type;
 613     unsigned int i;
 614
 615     /* Stop video capture */
 616     if( p_sys->i_fd_video >= 0 )
 617     {
 618         switch( p_sys->io )
 619         {
 620         case IO_METHOD_READ:
 621             /* Nothing to do */
 622             break;
 623
 624         case IO_METHOD_MMAP:
 625         case IO_METHOD_USERPTR:
 626             /* Some drivers 'hang' internally if this is not done before streamoff */
 627             for( unsigned int i = 0; i < p_sys->i_nbuffers; i++ )
 628             {
 629                 memset( &buf, 0, sizeof(buf) );
 630                 buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 631                 buf.memory = ( p_sys->io == IO_METHOD_USERPTR ) ?
 632                     V4L2_MEMORY_USERPTR : V4L2_MEMORY_MMAP;
 633                 ioctl( p_sys->i_fd_video, VIDIOC_DQBUF, &buf ); /* ignore result */
 634             }
 635
 636             buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 637             if( ioctl( p_sys->i_fd_video, VIDIOC_STREAMOFF, &buf_type ) < 0 ) {
 638                 msg_Err( p_demux, "VIDIOC_STREAMOFF failed" );
 639             }
 640
 641             break;
 642         }
 643     }
 644
 645     /* Free Video Buffers */
 646     if( p_sys->p_buffers ) {
 647         switch( p_sys->io )
 648         {
 649         case IO_METHOD_READ:
 650             free( p_sys->p_buffers[0].start );
 651             break;
 652
 653         case IO_METHOD_MMAP:
 654             for( i = 0; i < p_sys->i_nbuffers; ++i )
 655             {
 656                 if( munmap( p_sys->p_buffers[i].start, p_sys->p_buffers[i].length ) )
 657                 {
 658                     msg_Err( p_demux, "munmap failed" );
 659                 }
 660             }
 661             break;
 662
 663         case IO_METHOD_USERPTR:
 664             for( i = 0; i < p_sys->i_nbuffers; ++i )
 665             {
 666                free( p_sys->p_buffers[i].orig_userp );
 667             }
 668             break;
 669         }
 670         free( p_sys->p_buffers );
 671     }
 672
 673     /* Close */
 674     if( p_sys->i_fd_video >= 0 ) close( p_sys->i_fd_video );
 675     if( p_sys->i_fd_audio >= 0 ) close( p_sys->i_fd_audio );
 676
 677     if( p_sys->p_block_audio ) block_Release( p_sys->p_block_audio );
 678     if( p_sys->psz_device ) free( p_sys->psz_device );
 679     if( p_sys->psz_vdev ) free( p_sys->psz_vdev );
 680     if( p_sys->psz_adev ) free( p_sys->psz_adev );
 681     if( p_sys->p_standards ) free( p_sys->p_standards );
 682     if( p_sys->p_inputs ) free( p_sys->p_inputs );
 683     if( p_sys->p_tuners ) free( p_sys->p_tuners );
 684     if( p_sys->p_codecs ) free( p_sys->p_codecs );
 685     if( p_sys->psz_requested_chroma ) free( p_sys->psz_requested_chroma );
 686
 687     free( p_sys );
 688 }
 689
 690 /*****************************************************************************
 691  * Control:
 692  *****************************************************************************/
 693 static int Control( demux_t *p_demux, int i_query, va_list args )
 694 {
 695     demux_sys_t *p_sys = p_demux->p_sys;
 696     vlc_bool_t *pb;
 697     int64_t    *pi64;
 698
 699     switch( i_query )
 700     {
 701         /* Special for access_demux */
 702         case DEMUX_CAN_PAUSE:
 703         case DEMUX_SET_PAUSE_STATE:
 704         case DEMUX_CAN_CONTROL_PACE:
 705             pb = (vlc_bool_t*)va_arg( args, vlc_bool_t * );
 706             *pb = VLC_FALSE;
 707             return VLC_SUCCESS;
 708
 709         case DEMUX_GET_PTS_DELAY:
 710             pi64 = (int64_t*)va_arg( args, int64_t * );
 711             *pi64 = (int64_t)p_sys->i_pts * 1000;
 712             return VLC_SUCCESS;
 713
 714         case DEMUX_GET_TIME:
 715             pi64 = (int64_t*)va_arg( args, int64_t * );
 716             *pi64 = mdate();
 717             return VLC_SUCCESS;
 718
 719         /* TODO implement others */
 720         default:
 721             return VLC_EGENERIC;
 722     }
 723
 724     return VLC_EGENERIC;
 725 }
 726
 727 /*****************************************************************************
 728  * Demux: Processes the audio or video frame
 729  *****************************************************************************/
 730 static int Demux( demux_t *p_demux )
 731 {
 732     demux_sys_t *p_sys = p_demux->p_sys;
 733     es_out_id_t *p_es = p_sys->p_es_audio;
 734     block_t *p_block = NULL;
 735
 736     /* Try grabbing audio frames first */
 737     if( p_sys->i_fd_audio < 0 || !( p_block = GrabAudio( p_demux ) ) )
 738     {
 739         /* Try grabbing video frame */
 740         p_es = p_sys->p_es_video;
 741         if( p_sys->i_fd_video > 0 ) p_block = GrabVideo( p_demux );
 742     }
 743
 744     if( !p_block )
 745     {
 746         /* Sleep so we do not consume all the cpu, 10ms seems
 747          * like a good value (100fps) */
 748         msleep( 10 );
 749         return 1;
 750     }
 751
 752     es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
 753     es_out_Send( p_demux->out, p_es, p_block );
 754
 755     return 1;
 756 }
 757
 758 /*****************************************************************************
 759  * GrabVideo: Grab a video frame
 760  *****************************************************************************/
 761 static block_t* GrabVideo( demux_t *p_demux )
 762 {
 763     demux_sys_t *p_sys = p_demux->p_sys;
 764
 765     block_t *p_block = NULL;
 766     struct v4l2_buffer buf;
 767
 768     if( p_sys->f_fps >= 0.1 && p_sys->i_video_pts > 0 )
 769     {
 770         mtime_t i_dur = (mtime_t)((double)1000000 / (double)p_sys->f_fps);
 771
 772         /* Did we wait long enough ? (frame rate reduction) */
 773         if( p_sys->i_video_pts + i_dur > mdate() ) return 0;
 774     }
 775
 776     /* Grab Video Frame */
 777     switch( p_sys->io )
 778     {
 779     case IO_METHOD_READ:
 780         if( read( p_sys->i_fd_video, p_sys->p_buffers[0].start, p_sys->p_buffers[0].length ) )
 781         {
 782             switch( errno )
 783             {
 784             case EAGAIN:
 785                 return 0;
 786             case EIO:
 787                 /* Could ignore EIO, see spec. */
 788                 /* fall through */
 789             default:
 790                 msg_Err( p_demux, "Failed to read frame" );
 791                 return 0;
 792                }
 793         }
 794
 795         p_block = ProcessVideoFrame( p_demux, (uint8_t*)p_sys->p_buffers[0].start );
 796         if( !p_block ) return 0;
 797
 798         break;
 799
 800     case IO_METHOD_MMAP:
 801         memset( &buf, 0, sizeof(buf) );
 802         buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 803         buf.memory = V4L2_MEMORY_MMAP;
 804
 805         /* Wait for next frame */
 806         if (ioctl( p_sys->i_fd_video, VIDIOC_DQBUF, &buf ) < 0 )
 807         {
 808             switch( errno )
 809             {
 810             case EAGAIN:
 811                 return 0;
 812             case EIO:
 813                 /* Could ignore EIO, see spec. */
 814                 /* fall through */
 815             default:
 816                 msg_Err( p_demux, "Failed to wait (VIDIOC_DQBUF)" );
 817                 return 0;
 818                }
 819         }
 820
 821         if( buf.index >= p_sys->i_nbuffers ) {
 822             msg_Err( p_demux, "Failed capturing new frame as i>=nbuffers" );
 823             return 0;
 824         }
 825
 826         p_block = ProcessVideoFrame( p_demux, p_sys->p_buffers[buf.index].start );
 827         if( !p_block ) return 0;
 828
 829         /* Unlock */
 830         if( ioctl( p_sys->i_fd_video, VIDIOC_QBUF, &buf ) < 0 )
 831         {
 832             msg_Err (p_demux, "Failed to unlock (VIDIOC_QBUF)");
 833             return 0;
 834         }
 835
 836         break;
 837
 838     case IO_METHOD_USERPTR:
 839         memset( &buf, 0, sizeof(buf) );
 840         buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 841         buf.memory = V4L2_MEMORY_USERPTR;
 842
 843         /* Wait for next frame */
 844         if (ioctl( p_sys->i_fd_video, VIDIOC_DQBUF, &buf ) < 0 )
 845         {
 846             switch( errno )
 847             {
 848             case EAGAIN:
 849                 return 0;
 850             case EIO:
 851                 /* Could ignore EIO, see spec. */
 852                 /* fall through */
 853             default:
 854                 msg_Err( p_demux, "Failed to wait (VIDIOC_DQBUF)" );
 855                 return 0;
 856             }
 857         }
 858
 859         /* Find frame? */
 860         unsigned int i;
 861         for( i = 0; i < p_sys->i_nbuffers; i++ )
 862         {
 863             if( buf.m.userptr == (unsigned long)p_sys->p_buffers[i].start &&
 864                 buf.length == p_sys->p_buffers[i].length ) break;
 865         }
 866
 867         if( i >= p_sys->i_nbuffers )
 868         {
 869             msg_Err( p_demux, "Failed capturing new frame as i>=nbuffers" );
 870             return 0;
 871         }
 872
 873         p_block = ProcessVideoFrame( p_demux, (uint8_t*)buf.m.userptr );
 874         if( !p_block ) return 0;
 875
 876         /* Unlock */
 877         if( ioctl( p_sys->i_fd_video, VIDIOC_QBUF, &buf ) < 0 )
 878         {
 879             msg_Err (p_demux, "Failed to unlock (VIDIOC_QBUF)");
 880             return 0;
 881         }
 882
 883         break;
 884
 885     }
 886
 887     /* Timestamp */
 888     p_sys->i_video_pts = p_block->i_pts = p_block->i_dts = mdate();
 889
 890     return p_block;
 891 }
 892
 893 /*****************************************************************************
 894  * ProcessVideoFrame: Helper function to take a buffer and copy it into
 895  * a new block
 896  *****************************************************************************/
 897 static block_t* ProcessVideoFrame( demux_t *p_demux, uint8_t *p_frame )
 898 {
 899     demux_sys_t *p_sys = p_demux->p_sys;
 900     block_t *p_block;
 901
 902     if( !p_frame ) return 0;
 903
 904     /* New block */
 905     if( !( p_block = block_New( p_demux, p_sys->i_video_frame_size ) ) )
 906     {
 907         msg_Warn( p_demux, "Cannot get new block" );
 908         return 0;
 909     }
 910
 911     /* Copy frame */
 912     memcpy( p_block->p_buffer, p_frame, p_sys->i_video_frame_size );
 913
 914     return p_block;
 915 }
 916
 917 /*****************************************************************************
 918  * GrabAudio: Grab an audio frame
 919  *****************************************************************************/
 920 static block_t* GrabAudio( demux_t *p_demux )
 921 {
 922     demux_sys_t *p_sys = p_demux->p_sys;
 923     struct audio_buf_info buf_info;
 924     int i_read, i_correct;
 925     block_t *p_block;
 926
 927     /* Copied from v4l.c */
 928
 929     if( p_sys->p_block_audio ) p_block = p_sys->p_block_audio;
 930     else p_block = block_New( p_demux, p_sys->i_audio_max_frame_size );
 931
 932     if( !p_block )
 933     {
 934         msg_Warn( p_demux, "cannot get block" );
 935         return 0;
 936     }
 937
 938     p_sys->p_block_audio = p_block;
 939
 940     i_read = read( p_sys->i_fd_audio, p_block->p_buffer,
 941                    p_sys->i_audio_max_frame_size );
 942
 943     if( i_read <= 0 ) return 0;
 944
 945     p_block->i_buffer = i_read;
 946     p_sys->p_block_audio = 0;
 947
 948     /* Correct the date because of kernel buffering */
 949     i_correct = i_read;
 950     if( ioctl( p_sys->i_fd_audio, SNDCTL_DSP_GETISPACE, &buf_info ) == 0 )
 951     {
 952         i_correct += buf_info.bytes;
 953     }
 954
 955     /* Timestamp */
 956     p_block->i_pts = p_block->i_dts =
 957         mdate() - I64C(1000000) * (mtime_t)i_correct /
 958         2 / ( p_sys->b_stereo ? 2 : 1) / p_sys->i_sample_rate;
 959
 960     return p_block;
 961 }
 962
 963 /*****************************************************************************
 964  * Helper function to initalise video IO using the Read method
 965  *****************************************************************************/
 966 static int InitRead( demux_t *p_demux, int i_fd, unsigned int i_buffer_size )
 967 {
 968     demux_sys_t *p_sys = p_demux->p_sys;
 969
 970     p_sys->p_buffers = calloc( 1, sizeof( *p_sys->p_buffers ) );
 971     if( !p_sys->p_buffers )
 972     {
 973         msg_Err( p_demux, "Out of memory" );
 974         goto open_failed;
 975     }
 976
 977     p_sys->p_buffers[0].length = i_buffer_size;
 978     p_sys->p_buffers[0].start = malloc( i_buffer_size );
 979     if( !p_sys->p_buffers[0].start )
 980     {
 981         msg_Err( p_demux, "Out of memory" );
 982         goto open_failed;
 983     }
 984
 985     return VLC_SUCCESS;
 986
 987 open_failed:
 988     return VLC_EGENERIC;
 989
 990 }
 991
 992 /*****************************************************************************
 993  * Helper function to initalise video IO using the mmap method
 994  *****************************************************************************/
 995 static int InitMmap( demux_t *p_demux, int i_fd )
 996 {
 997     demux_sys_t *p_sys = p_demux->p_sys;
 998     struct v4l2_requestbuffers req;
 999
1000     memset( &req, 0, sizeof(req) );
1001     req.count = 4;
1002     req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1003     req.memory = V4L2_MEMORY_MMAP;
1004
1005     if( ioctl( i_fd, VIDIOC_REQBUFS, &req ) < 0 )
1006     {
1007         msg_Err( p_demux, "device does not support mmap i/o" );
1008         goto open_failed;
1009     }
1010
1011     if( req.count < 2 )
1012     {
1013         msg_Err( p_demux, "Insufficient buffer memory" );
1014         goto open_failed;
1015     }
1016
1017     p_sys->p_buffers = calloc( req.count, sizeof( *p_sys->p_buffers ) );
1018     if( !p_sys->p_buffers )
1019     {
1020         msg_Err( p_demux, "Out of memory" );
1021         goto open_failed;
1022     }
1023
1024     for( p_sys->i_nbuffers = 0; p_sys->i_nbuffers < req.count; ++p_sys->i_nbuffers )
1025     {
1026         struct v4l2_buffer buf;
1027
1028         memset( &buf, 0, sizeof(buf) );
1029         buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1030         buf.memory = V4L2_MEMORY_MMAP;
1031         buf.index = p_sys->i_nbuffers;
1032
1033         if( ioctl( i_fd, VIDIOC_QUERYBUF, &buf ) < 0 )
1034         {
1035             msg_Err( p_demux, "VIDIOC_QUERYBUF" );
1036             goto open_failed;
1037         }
1038
1039         p_sys->p_buffers[p_sys->i_nbuffers].length = buf.length;
1040         p_sys->p_buffers[p_sys->i_nbuffers].start =
1041             mmap( NULL, buf.length, PROT_READ | PROT_WRITE, MAP_SHARED, i_fd, buf.m.offset );
1042
1043         if( p_sys->p_buffers[p_sys->i_nbuffers].start == MAP_FAILED )
1044         {
1045             msg_Err( p_demux, "mmap failed (%m)" );
1046             goto open_failed;
1047         }
1048     }
1049
1050     return VLC_SUCCESS;
1051
1052 open_failed:
1053     return VLC_EGENERIC;
1054
1055 }
1056
1057 /*****************************************************************************
1058  * Helper function to initalise video IO using the userbuf method
1059  *****************************************************************************/
1060 static int InitUserP( demux_t *p_demux, int i_fd, unsigned int i_buffer_size )
1061 {
1062     demux_sys_t *p_sys = p_demux->p_sys;
1063     struct v4l2_requestbuffers req;
1064     unsigned int i_page_size;
1065
1066     i_page_size = getpagesize();
1067     i_buffer_size = ( i_buffer_size + i_page_size - 1 ) & ~( i_page_size - 1);
1068
1069     memset( &req, 0, sizeof(req) );
1070     req.count = 4;
1071     req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1072     req.memory = V4L2_MEMORY_USERPTR;
1073
1074     if( ioctl( i_fd, VIDIOC_REQBUFS, &req ) < 0 )
1075     {
1076         msg_Err( p_demux, "device does not support user pointer i/o" );
1077         goto open_failed;
1078     }
1079
1080     p_sys->p_buffers = calloc( 4, sizeof( *p_sys->p_buffers ) );
1081     if( !p_sys->p_buffers )
1082     {
1083         msg_Err( p_demux, "Out of memory" );
1084         goto open_failed;
1085     }
1086
1087     for( p_sys->i_nbuffers = 0; p_sys->i_nbuffers < 4; ++p_sys->i_nbuffers )
1088     {
1089         p_sys->p_buffers[p_sys->i_nbuffers].length = i_buffer_size;
1090         p_sys->p_buffers[p_sys->i_nbuffers].start =
1091             vlc_memalign( &p_sys->p_buffers[p_sys->i_nbuffers].orig_userp,
1092                 /* boundary */ i_page_size, i_buffer_size );
1093
1094         if( !p_sys->p_buffers[p_sys->i_nbuffers].start )
1095         {
1096             msg_Err( p_demux, "out of memory" );
1097             goto open_failed;
1098         }
1099     }
1100
1101     return VLC_SUCCESS;
1102
1103 open_failed:
1104     return VLC_EGENERIC;
1105
1106 }
1107
1108 /*****************************************************************************
1109  * IsPixelFormatSupported: returns true if the specified V4L2 pixel format is
1110  * in the array of supported formats returned by the driver
1111  *****************************************************************************/
1112 vlc_bool_t IsPixelFormatSupported( demux_t *p_demux, unsigned int i_pixelformat )
1113 {
1114     demux_sys_t *p_sys = p_demux->p_sys;
1115
1116     for( int i_index = 0; i_index < p_sys->i_codec; i_index++ )
1117     {
1118         if( p_sys->p_codecs[i_index].pixelformat == i_pixelformat ) return VLC_TRUE;
1119     }
1120
1121     return VLC_FALSE;
1122 }
1123
1124 /*****************************************************************************
1125  * OpenVideoDev: open and set up the video device and probe for capabilities
1126  *****************************************************************************/
1127 int OpenVideoDev( demux_t *p_demux, char *psz_device )
1128 {
1129     int i_fd;
1130     demux_sys_t *p_sys = p_demux->p_sys;
1131     struct v4l2_cropcap cropcap;
1132     struct v4l2_crop crop;
1133     struct v4l2_format fmt;
1134     unsigned int i_min;
1135     enum v4l2_buf_type buf_type;
1136
1137     if( ( i_fd = open( psz_device, O_RDWR ) ) < 0 )
1138     {
1139         msg_Err( p_demux, "cannot open device (%m)" );
1140         goto open_failed;
1141     }
1142
1143     /* Select standard */
1144
1145     if( p_sys->i_selected_standard_id != V4L2_STD_UNKNOWN )
1146     {
1147         if( ioctl( i_fd, VIDIOC_S_STD, &p_sys->i_selected_standard_id ) < 0 )
1148         {
1149             msg_Err( p_demux, "cannot set standard (%m)" );
1150             goto open_failed;
1151         }
1152         msg_Dbg( p_demux, "Set standard" );
1153     }
1154
1155     /* Select input */
1156
1157     if( p_sys->i_selected_input > p_sys->i_input )
1158     {
1159         msg_Warn( p_demux, "invalid input. Using the default one" );
1160         p_sys->i_selected_input = 0;
1161     }
1162
1163     if( ioctl( i_fd, VIDIOC_S_INPUT, &p_sys->i_selected_input ) < 0 )
1164     {
1165         msg_Err( p_demux, "cannot set input (%m)" );
1166         goto open_failed;
1167     }
1168
1169     /* Verify device support for the various IO methods */
1170     switch( p_sys->io )
1171     {
1172     case IO_METHOD_READ:
1173         if( !(p_sys->dev_cap.capabilities & V4L2_CAP_READWRITE) )
1174         {
1175             msg_Err( p_demux, "device does not support read i/o" );
1176             goto open_failed;
1177         }
1178         break;
1179
1180     case IO_METHOD_MMAP:
1181     case IO_METHOD_USERPTR:
1182         if( !(p_sys->dev_cap.capabilities & V4L2_CAP_STREAMING) )
1183         {
1184             msg_Err( p_demux, "device does not support streaming i/o" );
1185             goto open_failed;
1186         }
1187         break;
1188
1189     default:
1190         msg_Err( p_demux, "io method not supported" );
1191         goto open_failed;
1192     }
1193
1194     /* Reset Cropping */
1195     memset( &cropcap, 0, sizeof(cropcap) );
1196     cropcap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1197     if( ioctl( i_fd, VIDIOC_CROPCAP, &cropcap ) >= 0 )
1198     {
1199         crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1200         crop.c = cropcap.defrect; /* reset to default */
1201         if( ioctl( i_fd, VIDIOC_S_CROP, &crop ) < 0 )
1202         {
1203             switch( errno )
1204             {
1205             case EINVAL:
1206                 /* Cropping not supported. */
1207                 break;
1208             default:
1209                 /* Errors ignored. */
1210                 break;
1211             }
1212         }
1213     }
1214
1215     /* Try and find default resolution if not specified */
1216     memset( &fmt, 0, sizeof(fmt) );
1217     fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1218
1219     if( p_sys->i_width <= 0 || p_sys->i_height <= 0 )
1220     {
1221         if( ioctl( i_fd, VIDIOC_G_FMT, &fmt ) < 0 )
1222         {
1223             msg_Err( p_demux, "Cannot get default width and height." );
1224             goto open_failed;
1225         }
1226
1227         p_sys->i_width = fmt.fmt.pix.width;
1228         p_sys->i_height = fmt.fmt.pix.height;
1229
1230         if( fmt.fmt.pix.field == V4L2_FIELD_ALTERNATE )
1231         {
1232             p_sys->i_height = p_sys->i_height * 2;
1233         }
1234     }
1235     else
1236     {
1237         msg_Dbg( p_demux, "trying specified size %dx%d", p_sys->i_width, p_sys->i_height );
1238     }
1239
1240     fmt.fmt.pix.width = p_sys->i_width;
1241     fmt.fmt.pix.height = p_sys->i_height;
1242     fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
1243
1244     /* Test and set Chroma */
1245     fmt.fmt.pix.pixelformat = 0;
1246     if( p_sys->psz_requested_chroma && strlen( p_sys->psz_requested_chroma ) > 0 )
1247     {
1248         /* User specified chroma */
1249         if( strlen( p_sys->psz_requested_chroma ) >= 4 )
1250         {
1251             int i_requested_fourcc = VLC_FOURCC(
1252                 p_sys->psz_requested_chroma[0], p_sys->psz_requested_chroma[1],
1253                 p_sys->psz_requested_chroma[2], p_sys->psz_requested_chroma[3] );
1254             for( int i = 0; v4l2chroma_to_fourcc[i].i_v4l2 != 0; i++ )
1255             {
1256                 if( v4l2chroma_to_fourcc[i].i_fourcc == i_requested_fourcc )
1257                 {
1258                     fmt.fmt.pix.pixelformat = v4l2chroma_to_fourcc[i].i_v4l2;
1259                     break;
1260                 }
1261             }
1262         }
1263         /* Try and set user chroma */
1264         if( !IsPixelFormatSupported( p_demux, fmt.fmt.pix.pixelformat ) || ( fmt.fmt.pix.pixelformat && ioctl( i_fd, VIDIOC_S_FMT, &fmt ) < 0 ) )
1265         {
1266             msg_Warn( p_demux, "Driver is unable to use specified chroma %s. Trying defaults.", p_sys->psz_requested_chroma );
1267             fmt.fmt.pix.pixelformat = 0;
1268         }
1269     }
1270
1271     /* If no user specified chroma, find best */
1272     if( !fmt.fmt.pix.pixelformat )
1273     {
1274         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YVU420;
1275         if( !IsPixelFormatSupported( p_demux, fmt.fmt.pix.pixelformat ) || ioctl( i_fd, VIDIOC_S_FMT, &fmt ) < 0 )
1276         {
1277             fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUV422P;
1278             if( !IsPixelFormatSupported( p_demux, fmt.fmt.pix.pixelformat ) || ioctl( i_fd, VIDIOC_S_FMT, &fmt ) < 0 )
1279             {
1280                 fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
1281                 if( !IsPixelFormatSupported( p_demux, fmt.fmt.pix.pixelformat ) || ioctl( i_fd, VIDIOC_S_FMT, &fmt ) < 0 )
1282                 {
1283                     msg_Err( p_demux, "Could not select any of the default chromas!" );
1284                     goto open_failed;
1285                 }
1286             }
1287         }
1288     }
1289
1290     /* Reassign width, height and chroma incase driver override */
1291     p_sys->i_width = fmt.fmt.pix.width;
1292     p_sys->i_height = fmt.fmt.pix.height;
1293
1294     /* Look up final fourcc */
1295     p_sys->i_fourcc = 0;
1296     for( int i = 0; v4l2chroma_to_fourcc[i].i_fourcc != 0; i++ )
1297     {
1298         if( v4l2chroma_to_fourcc[i].i_v4l2 == fmt.fmt.pix.pixelformat )
1299         {
1300             p_sys->i_fourcc = v4l2chroma_to_fourcc[i].i_fourcc;
1301             break;
1302         }
1303     }
1304
1305     /* Buggy driver paranoia */
1306     i_min = fmt.fmt.pix.width * 2;
1307     if( fmt.fmt.pix.bytesperline < i_min )
1308         fmt.fmt.pix.bytesperline = i_min;
1309     i_min = fmt.fmt.pix.bytesperline * fmt.fmt.pix.height;
1310     if( fmt.fmt.pix.sizeimage < i_min )
1311         fmt.fmt.pix.sizeimage = i_min;
1312
1313     /* Init vout Picture */
1314     vout_InitPicture( VLC_OBJECT(p_demux), &p_sys->pic, p_sys->i_fourcc,
1315         p_sys->i_width, p_sys->i_height, p_sys->i_width *
1316         VOUT_ASPECT_FACTOR / p_sys->i_height );
1317     if( !p_sys->pic.i_planes )
1318     {
1319         msg_Err( p_demux, "unsupported chroma" );
1320         goto open_failed;
1321     }
1322     p_sys->i_video_frame_size = 0;
1323     for( int i = 0; i < p_sys->pic.i_planes; i++ )
1324     {
1325          p_sys->i_video_frame_size += p_sys->pic.p[i].i_visible_lines * p_sys->pic.p[i].i_visible_pitch;
1326     }
1327
1328     /* Init IO method */
1329     switch( p_sys->io )
1330     {
1331     case IO_METHOD_READ:
1332         if( InitRead( p_demux, i_fd, fmt.fmt.pix.sizeimage ) != VLC_SUCCESS ) goto open_failed;
1333         break;
1334
1335     case IO_METHOD_MMAP:
1336         if( InitMmap( p_demux, i_fd ) != VLC_SUCCESS ) goto open_failed;
1337         break;
1338
1339     case IO_METHOD_USERPTR:
1340         if( InitUserP( p_demux, i_fd, fmt.fmt.pix.sizeimage ) != VLC_SUCCESS ) goto open_failed;
1341         break;
1342
1343     }
1344
1345     /* Add */
1346     es_format_t es_fmt;
1347     es_format_Init( &es_fmt, VIDEO_ES, p_sys->i_fourcc );
1348     es_fmt.video.i_width  = p_sys->i_width;
1349     es_fmt.video.i_height = p_sys->i_height;
1350     es_fmt.video.i_aspect = 4 * VOUT_ASPECT_FACTOR / 3;
1351
1352     /* Setup rgb mask for RGB formats */
1353     if( p_sys->i_fourcc == VLC_FOURCC( 'R','V','2','4' ) )
1354     {
1355         /* This is in BGR format */
1356         es_fmt.video.i_bmask = 0x00ff0000;
1357         es_fmt.video.i_gmask = 0x0000ff00;
1358         es_fmt.video.i_rmask = 0x000000ff;
1359     }
1360
1361     msg_Dbg( p_demux, "added new video es %4.4s %dx%d",
1362         (char*)&es_fmt.i_codec, es_fmt.video.i_width, es_fmt.video.i_height );
1363     p_sys->p_es_video = es_out_Add( p_demux->out, &es_fmt );
1364
1365     /* Start Capture */
1366
1367     switch( p_sys->io )
1368     {
1369     case IO_METHOD_READ:
1370         /* Nothing to do */
1371         break;
1372
1373     case IO_METHOD_MMAP:
1374         for (unsigned int i = 0; i < p_sys->i_nbuffers; ++i)
1375         {
1376             struct v4l2_buffer buf;
1377
1378             memset( &buf, 0, sizeof(buf) );
1379             buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1380             buf.memory = V4L2_MEMORY_MMAP;
1381             buf.index = i;
1382
1383             if( ioctl( i_fd, VIDIOC_QBUF, &buf ) < 0 )
1384             {
1385                 msg_Err( p_demux, "VIDIOC_QBUF failed" );
1386                 goto open_failed;
1387             }
1388         }
1389
1390         buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1391         if( ioctl( i_fd, VIDIOC_STREAMON, &buf_type ) < 0 )
1392         {
1393             msg_Err( p_demux, "VIDIOC_STREAMON failed" );
1394             goto open_failed;
1395         }
1396
1397         break;
1398
1399     case IO_METHOD_USERPTR:
1400         for( unsigned int i = 0; i < p_sys->i_nbuffers; ++i )
1401         {
1402             struct v4l2_buffer buf;
1403
1404             memset( &buf, 0, sizeof(buf) );
1405             buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1406             buf.memory = V4L2_MEMORY_USERPTR;
1407             buf.index = i;
1408             buf.m.userptr = (unsigned long)p_sys->p_buffers[i].start;
1409             buf.length = p_sys->p_buffers[i].length;
1410
1411             if( ioctl( i_fd, VIDIOC_QBUF, &buf ) < 0 )
1412             {
1413                 msg_Err( p_demux, "VIDIOC_QBUF failed" );
1414                 goto open_failed;
1415             }
1416         }
1417
1418         buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1419         if( ioctl( i_fd, VIDIOC_STREAMON, &buf_type ) < 0 )
1420         {
1421             msg_Err( p_demux, "VIDIOC_STREAMON failed" );
1422             goto open_failed;
1423         }
1424
1425         break;
1426     }
1427
1428     /* report fps */
1429     if( p_sys->f_fps >= 0.1 )
1430     {
1431         msg_Dbg( p_demux, "User set fps=%f", p_sys->f_fps );
1432     }
1433
1434     return i_fd;
1435
1436 open_failed:
1437     if( i_fd >= 0 ) close( i_fd );
1438     return -1;
1439
1440 }
1441
1442 /*****************************************************************************
1443  * OpenAudioDev: open and set up the audio device and probe for capabilities
1444  *****************************************************************************/
1445 int OpenAudioDev( demux_t *p_demux, char *psz_device )
1446 {
1447     demux_sys_t *p_sys = p_demux->p_sys;
1448     int i_fd, i_format;
1449
1450     if( (i_fd = open( psz_device, O_RDONLY | O_NONBLOCK )) < 0 )
1451     {
1452         msg_Err( p_demux, "cannot open audio device (%m)" );
1453         goto adev_fail;
1454     }
1455
1456     i_format = AFMT_S16_LE;
1457     if( ioctl( i_fd, SNDCTL_DSP_SETFMT, &i_format ) < 0
1458         || i_format != AFMT_S16_LE )
1459     {
1460         msg_Err( p_demux, "cannot set audio format (16b little endian) "
1461                  "(%m)" );
1462         goto adev_fail;
1463     }
1464
1465     if( ioctl( i_fd, SNDCTL_DSP_STEREO,
1466                &p_sys->b_stereo ) < 0 )
1467     {
1468         msg_Err( p_demux, "cannot set audio channels count (%m)" );
1469         goto adev_fail;
1470     }
1471
1472     if( ioctl( i_fd, SNDCTL_DSP_SPEED,
1473                &p_sys->i_sample_rate ) < 0 )
1474     {
1475         msg_Err( p_demux, "cannot set audio sample rate (%m)" );
1476         goto adev_fail;
1477     }
1478
1479     msg_Dbg( p_demux, "opened adev=`%s' %s %dHz",
1480              psz_device, p_sys->b_stereo ? "stereo" : "mono",
1481              p_sys->i_sample_rate );
1482
1483     p_sys->i_audio_max_frame_size = 6 * 1024;
1484
1485     es_format_t fmt;
1486     es_format_Init( &fmt, AUDIO_ES, VLC_FOURCC('a','r','a','w') );
1487
1488     fmt.audio.i_channels = p_sys->b_stereo ? 2 : 1;
1489     fmt.audio.i_rate = p_sys->i_sample_rate;
1490     fmt.audio.i_bitspersample = 16; /* FIXME ? */
1491     fmt.audio.i_blockalign = fmt.audio.i_channels * fmt.audio.i_bitspersample / 8;
1492     fmt.i_bitrate = fmt.audio.i_channels * fmt.audio.i_rate * fmt.audio.i_bitspersample;
1493
1494     msg_Dbg( p_demux, "new audio es %d channels %dHz",
1495       fmt.audio.i_channels, fmt.audio.i_rate );
1496
1497     p_sys->p_es_audio = es_out_Add( p_demux->out, &fmt );
1498
1499     return i_fd;
1500
1501  adev_fail:
1502
1503     if( i_fd >= 0 ) close( i_fd );
1504     return -1;
1505
1506 }
1507
1508 /*****************************************************************************
1509  * ProbeVideoDev: probe video for capabilities
1510  *****************************************************************************/
1511 vlc_bool_t ProbeVideoDev( demux_t *p_demux, char *psz_device )
1512 {
1513     int i_index;
1514     int i_standard;
1515
1516     int i_fd;
1517     demux_sys_t *p_sys = p_demux->p_sys;
1518
1519     if( ( i_fd = open( psz_device, O_RDWR ) ) < 0 )
1520     {
1521         msg_Err( p_demux, "cannot open video device (%m)" );
1522         goto open_failed;
1523     }
1524
1525     /* Get device capabilites */
1526
1527     if( ioctl( i_fd, VIDIOC_QUERYCAP, &p_sys->dev_cap ) < 0 )
1528     {
1529         msg_Err( p_demux, "cannot get video capabilities (%m)" );
1530         goto open_failed;
1531     }
1532
1533     msg_Dbg( p_demux, "V4L2 device: %s using driver: %s (version: %u.%u.%u) on %s",
1534                             p_sys->dev_cap.card,
1535                             p_sys->dev_cap.driver,
1536                             (p_sys->dev_cap.version >> 16) & 0xFF,
1537                             (p_sys->dev_cap.version >> 8) & 0xFF,
1538                             p_sys->dev_cap.version & 0xFF,
1539                             p_sys->dev_cap.bus_info );
1540
1541     msg_Dbg( p_demux, "the device has the capabilities: (%c) Video Capure, "
1542                                                        "(%c) Audio, "
1543                                                        "(%c) Tuner",
1544              ( p_sys->dev_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE  ? 'X':' '),
1545              ( p_sys->dev_cap.capabilities & V4L2_CAP_AUDIO  ? 'X':' '),
1546              ( p_sys->dev_cap.capabilities & V4L2_CAP_TUNER  ? 'X':' ') );
1547
1548     msg_Dbg( p_demux, "supported I/O methods are: (%c) Read/Write, "
1549                                                  "(%c) Streaming, "
1550                                                  "(%c) Asynchronous",
1551             ( p_sys->dev_cap.capabilities & V4L2_CAP_READWRITE ? 'X':' ' ),
1552             ( p_sys->dev_cap.capabilities & V4L2_CAP_STREAMING ? 'X':' ' ),
1553             ( p_sys->dev_cap.capabilities & V4L2_CAP_ASYNCIO ? 'X':' ' ) );
1554
1555     /* Now, enumerate all the video inputs. This is useless at the moment
1556        since we have no way to present that info to the user except with
1557        debug messages */
1558
1559     if( p_sys->dev_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE )
1560     {
1561         while( ioctl( i_fd, VIDIOC_S_INPUT, &p_sys->i_input ) >= 0 )
1562         {
1563             p_sys->i_input++;
1564         }
1565
1566         p_sys->p_inputs = calloc( 1, p_sys->i_input * sizeof( struct v4l2_input ) );
1567         if( !p_sys->p_inputs ) goto open_failed;
1568
1569         for( i_index = 0; i_index < p_sys->i_input; i_index++ )
1570         {
1571             p_sys->p_inputs[i_index].index = i_index;
1572
1573             if( ioctl( i_fd, VIDIOC_ENUMINPUT, &p_sys->p_inputs[i_index] ) )
1574             {
1575                 msg_Err( p_demux, "cannot get video input characteristics (%m)" );
1576                 goto open_failed;
1577             }
1578             msg_Dbg( p_demux, "video input %i (%s) has type: %s",
1579                                 i_index,
1580                                 p_sys->p_inputs[i_index].name,
1581                                 p_sys->p_inputs[i_index].type
1582                                         == V4L2_INPUT_TYPE_TUNER ?
1583                                         "Tuner adapter" :
1584                                         "External analog input" );
1585         }
1586     }
1587
1588     /* Probe video standards */
1589     if( p_sys->dev_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE )
1590     {
1591         struct v4l2_standard t_standards;
1592         t_standards.index = 0;
1593         while( ioctl( i_fd, VIDIOC_ENUMSTD, &t_standards ) >=0 )
1594         {
1595             p_sys->i_standard++;
1596             t_standards.index = p_sys->i_standard;
1597         }
1598
1599         p_sys->p_standards = calloc( 1, p_sys->i_standard * sizeof( struct v4l2_standard ) );
1600         if( !p_sys->p_standards ) goto open_failed;
1601
1602         for( i_standard = 0; i_standard < p_sys->i_standard; i_standard++ )
1603         {
1604             p_sys->p_standards[i_standard].index = i_standard;
1605
1606             if( ioctl( i_fd, VIDIOC_ENUMSTD, &p_sys->p_standards[i_standard] ) )
1607             {
1608                 msg_Err( p_demux, "cannot get video input standards (%m)" );
1609                 goto open_failed;
1610             }
1611             msg_Dbg( p_demux, "video standard %i is: %s",
1612                                 i_standard,
1613                                 p_sys->p_standards[i_standard].name);
1614         }
1615     }
1616
1617     /* initialize the structures for the ioctls */
1618     for( i_index = 0; i_index < 32; i_index++ )
1619     {
1620         p_sys->p_audios[i_index].index = i_index;
1621     }
1622
1623     /* Probe audio inputs */
1624
1625     if( p_sys->dev_cap.capabilities & V4L2_CAP_AUDIO )
1626     {
1627         while( p_sys->i_audio < 32 &&
1628                ioctl( i_fd, VIDIOC_S_AUDIO, &p_sys->p_audios[p_sys->i_audio] ) >= 0 )
1629         {
1630             if( ioctl( i_fd, VIDIOC_G_AUDIO, &p_sys->p_audios[ p_sys->i_audio] ) < 0 )
1631             {
1632                 msg_Err( p_demux, "cannot get audio input characteristics (%m)" );
1633                 goto open_failed;
1634             }
1635
1636             msg_Dbg( p_demux, "audio device %i (%s) is %s",
1637                                 p_sys->i_audio,
1638                                 p_sys->p_audios[p_sys->i_audio].name,
1639                                 p_sys->p_audios[p_sys->i_audio].capability &
1640                                                     V4L2_AUDCAP_STEREO ?
1641                                         "Stereo" : "Mono" );
1642
1643             p_sys->i_audio++;
1644         }
1645     }
1646
1647     if( p_sys->dev_cap.capabilities & V4L2_CAP_TUNER )
1648     {
1649         struct v4l2_tuner tuner;
1650
1651         memset( &tuner, 0, sizeof(tuner) );
1652         while( ioctl( i_fd, VIDIOC_S_TUNER, &tuner ) >= 0 )
1653         {
1654             p_sys->i_tuner++;
1655             tuner.index = p_sys->i_tuner;
1656         }
1657
1658         p_sys->p_tuners = calloc( 1, p_sys->i_tuner * sizeof( struct v4l2_tuner ) );
1659         if( !p_sys->p_tuners ) goto open_failed;
1660
1661         for( i_index = 0; i_index < p_sys->i_tuner; i_index++ )
1662         {
1663             p_sys->p_tuners[i_index].index = i_index;
1664
1665             if( ioctl( i_fd, VIDIOC_G_TUNER, &p_sys->p_tuners[i_index] ) )
1666             {
1667                 msg_Err( p_demux, "cannot get tuner characteristics (%m)" );
1668                 goto open_failed;
1669             }
1670             msg_Dbg( p_demux, "tuner %i (%s) has type: %s, "
1671                               "frequency range: %.1f %s -> %.1f %s",
1672                                 i_index,
1673                                 p_sys->p_tuners[i_index].name,
1674                                 p_sys->p_tuners[i_index].type
1675                                         == V4L2_TUNER_RADIO ?
1676                                         "Radio" : "Analog TV",
1677                                 p_sys->p_tuners[i_index].rangelow * 62.5,
1678                                 p_sys->p_tuners[i_index].capability &
1679                                         V4L2_TUNER_CAP_LOW ?
1680                                         "Hz" : "kHz",
1681                                 p_sys->p_tuners[i_index].rangehigh * 62.5,
1682                                 p_sys->p_tuners[i_index].capability &
1683                                         V4L2_TUNER_CAP_LOW ?
1684                                         "Hz" : "kHz" );
1685         }
1686     }
1687
1688     /* Probe for available chromas */
1689     if( p_sys->dev_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE )
1690     {
1691         struct v4l2_fmtdesc codec;
1692
1693         i_index = 0;
1694         memset( &codec, 0, sizeof(codec) );
1695         codec.index = i_index;
1696         codec.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1697
1698         while( ioctl( i_fd, VIDIOC_ENUM_FMT, &codec ) >= 0 )
1699         {
1700             i_index++;
1701             codec.index = i_index;
1702         }
1703
1704         p_sys->i_codec = i_index;
1705
1706         p_sys->p_codecs = calloc( 1, p_sys->i_codec * sizeof( struct v4l2_fmtdesc ) );
1707
1708         for( i_index = 0; i_index < p_sys->i_codec; i_index++ )
1709         {
1710             p_sys->p_codecs[i_index].index = i_index;
1711             p_sys->p_codecs[i_index].type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1712
1713             if( ioctl( i_fd, VIDIOC_ENUM_FMT, &p_sys->p_codecs[i_index] ) < 0 )
1714             {
1715                 msg_Err( p_demux, "cannot get codec description (%m)" );
1716                 goto open_failed;
1717             }
1718
1719             /* only print if vlc supports the format */
1720             vlc_bool_t b_codec_supported = VLC_FALSE;
1721             for( int i = 0; v4l2chroma_to_fourcc[i].i_v4l2 != 0; i++ )
1722             {
1723                 if( v4l2chroma_to_fourcc[i].i_v4l2 == p_sys->p_codecs[i_index].pixelformat )
1724                 {
1725                     b_codec_supported = VLC_TRUE;
1726
1727                     char psz_fourcc[5];
1728                     memset( &psz_fourcc, 0, sizeof( psz_fourcc ) );
1729                     vlc_fourcc_to_char( v4l2chroma_to_fourcc[i].i_fourcc, &psz_fourcc );
1730                     msg_Dbg( p_demux, "device supports chroma %4s [%s]",
1731                                 psz_fourcc,
1732                                 p_sys->p_codecs[i_index].description );
1733                 }
1734             }
1735             if( !b_codec_supported )
1736             {
1737                 msg_Dbg( p_demux, "device codec %s not supported",
1738                     p_sys->p_codecs[i_index].description );
1739             }
1740
1741         }
1742     }
1743
1744
1745     if( i_fd >= 0 ) close( i_fd );
1746     return VLC_TRUE;
1747
1748 open_failed:
1749
1750     if( i_fd >= 0 ) close( i_fd );
1751     return VLC_FALSE;
1752
1753 }
1754
1755 /*****************************************************************************
1756  * ProbeAudioDev: probe audio for capabilities
1757  *****************************************************************************/
1758 vlc_bool_t ProbeAudioDev( demux_t *p_demux, char *psz_device )
1759 {
1760     int i_fd = 0;
1761     int i_caps;
1762
1763     if( ( i_fd = open( psz_device, O_RDONLY | O_NONBLOCK ) ) < 0 )
1764     {
1765         msg_Err( p_demux, "cannot open audio device (%m)" );
1766         goto open_failed;
1767     }
1768
1769     /* this will fail if the device is video */
1770     if( ioctl( i_fd, SNDCTL_DSP_GETCAPS, &i_caps ) < 0 )
1771     {
1772         msg_Err( p_demux, "cannot get audio caps (%m)" );
1773         goto open_failed;
1774     }
1775
1776     if( i_fd >= 0 ) close( i_fd );
1777     return VLC_TRUE;
1778
1779 open_failed:
1780     if( i_fd >= 0 ) close( i_fd );
1781     return VLC_FALSE;
1782
1783 }
1784