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

   1 /*****************************************************************************
   2  * v4l2.c : Video4Linux2 input module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2002-2009 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Benjamin Pracht <bigben at videolan dot org>
   8  *          Richard Hosking <richard at hovis dot net>
   9  *          Antoine Cellerier <dionoea at videolan d.t org>
  10  *          Dennis Lou <dlou99 at yahoo dot com>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  25  *****************************************************************************/
  26
  27 /*
  28  * Sections based on the reference V4L2 capture example at
  29  * http://v4l2spec.bytesex.org/spec/capture-example.html
  30  */
  31
  32 /*****************************************************************************
  33  * Preamble
  34  *****************************************************************************/
  35
  36 #ifdef HAVE_CONFIG_H
  37 # include "config.h"
  38 #endif
  39
  40 #include <vlc_common.h>
  41 #include <vlc_plugin.h>
  42 #include <vlc_access.h>
  43 #include <vlc_demux.h>
  44 #include <vlc_input.h>
  45
  46 #include <ctype.h>
  47 #include <fcntl.h>
  48 #include <sys/ioctl.h>
  49 #include <sys/mman.h>
  50
  51 #include <linux/videodev2.h>
  52
  53 #include <poll.h>
  54
  55 #ifdef HAVE_LIBV4L2
  56 #   include <libv4l2.h>
  57 #endif
  58
  59 /*****************************************************************************
  60  * Module descriptior
  61  *****************************************************************************/
  62
  63 static int  DemuxOpen ( vlc_object_t * );
  64 static void DemuxClose( vlc_object_t * );
  65 static int  AccessOpen ( vlc_object_t * );
  66 static void AccessClose( vlc_object_t * );
  67
  68 #define STANDARD_TEXT N_( "Standard" )
  69 #define STANDARD_LONGTEXT N_( \
  70     "Video standard (Default, SECAM, PAL, or NTSC)." )
  71 #define CHROMA_TEXT N_("Video input chroma format")
  72 #define CHROMA_LONGTEXT N_( \
  73     "Force the Video4Linux2 video device to use a specific chroma format " \
  74     "(eg. I420 or I422 for raw images, MJPG for M-JPEG compressed input) " \
  75     "(Complete list: GREY, I240, RV16, RV15, RV24, RV32, YUY2, YUYV, UYVY, " \
  76     "I41N, I422, I420, I411, I410, MJPG)")
  77 #define INPUT_TEXT N_( "Input" )
  78 #define INPUT_LONGTEXT N_( \
  79     "Input of the card to use (see debug)." )
  80 #define AUDIO_INPUT_TEXT N_( "Audio input" )
  81 #define AUDIO_INPUT_LONGTEXT N_( \
  82     "Audio input of the card to use (see debug)." )
  83 #define IOMETHOD_TEXT N_( "IO Method" )
  84 #define IOMETHOD_LONGTEXT N_( \
  85     "IO Method (READ, MMAP, USERPTR)." )
  86 #define WIDTH_TEXT N_( "Width" )
  87 #define WIDTH_LONGTEXT N_( \
  88     "Force width (-1 for autodetect, 0 for driver default)." )
  89 #define HEIGHT_TEXT N_( "Height" )
  90 #define HEIGHT_LONGTEXT N_( \
  91     "Force height (-1 for autodetect, 0 for driver default)." )
  92 #define FPS_TEXT N_( "Framerate" )
  93 #define FPS_LONGTEXT N_( "Framerate to capture, if applicable " \
  94     "(0 for autodetect)." )
  95
  96 #ifdef HAVE_LIBV4L2
  97 #define LIBV4L2_TEXT N_( "Use libv4l2" )
  98 #define LIBV4L2_LONGTEXT N_( \
  99     "Force usage of the libv4l2 wrapper." )
 100 #endif
 101
 102 #define CTRL_RESET_TEXT N_( "Reset v4l2 controls" )
 103 #define CTRL_RESET_LONGTEXT N_( \
 104     "Reset controls to defaults provided by the v4l2 driver." )
 105 #define BRIGHTNESS_TEXT N_( "Brightness" )
 106 #define BRIGHTNESS_LONGTEXT N_( \
 107     "Brightness of the video input (if supported by the v4l2 driver)." )
 108 #define CONTRAST_TEXT N_( "Contrast" )
 109 #define CONTRAST_LONGTEXT N_( \
 110     "Contrast of the video input (if supported by the v4l2 driver)." )
 111 #define SATURATION_TEXT N_( "Saturation" )
 112 #define SATURATION_LONGTEXT N_( \
 113     "Saturation of the video input (if supported by the v4l2 driver)." )
 114 #define HUE_TEXT N_( "Hue" )
 115 #define HUE_LONGTEXT N_( \
 116     "Hue of the video input (if supported by the v4l2 driver)." )
 117 #define BLACKLEVEL_TEXT N_( "Black level" )
 118 #define BLACKLEVEL_LONGTEXT N_( \
 119     "Black level of the video input (if supported by the v4l2 driver)." )
 120 #define AUTOWHITEBALANCE_TEXT N_( "Auto white balance" )
 121 #define AUTOWHITEBALANCE_LONGTEXT N_( \
 122     "Automatically set the white balance of the video input " \
 123     "(if supported by the v4l2 driver)." )
 124 #define DOWHITEBALANCE_TEXT N_( "Do white balance" )
 125 #define DOWHITEBALANCE_LONGTEXT N_( \
 126     "Trigger a white balancing action, useless if auto white balance is " \
 127     "activated (if supported by the v4l2 driver)." )
 128 #define REDBALANCE_TEXT N_( "Red balance" )
 129 #define REDBALANCE_LONGTEXT N_( \
 130     "Red balance of the video input (if supported by the v4l2 driver)." )
 131 #define BLUEBALANCE_TEXT N_( "Blue balance" )
 132 #define BLUEBALANCE_LONGTEXT N_( \
 133     "Blue balance of the video input (if supported by the v4l2 driver)." )
 134 #define GAMMA_TEXT N_( "Gamma" )
 135 #define GAMMA_LONGTEXT N_( \
 136     "Gamma of the video input (if supported by the v4l2 driver)." )
 137 #define EXPOSURE_TEXT N_( "Exposure" )
 138 #define EXPOSURE_LONGTEXT N_( \
 139     "Exposure of the video input (if supported by the v4L2 driver)." )
 140 #define AUTOGAIN_TEXT N_( "Auto gain" )
 141 #define AUTOGAIN_LONGTEXT N_( \
 142     "Automatically set the video input's gain (if supported by the " \
 143     "v4l2 driver)." )
 144 #define GAIN_TEXT N_( "Gain" )
 145 #define GAIN_LONGTEXT N_( \
 146     "Video input's gain (if supported by the v4l2 driver)." )
 147 #define HFLIP_TEXT N_( "Horizontal flip" )
 148 #define HFLIP_LONGTEXT N_( \
 149     "Flip the video horizontally (if supported by the v4l2 driver)." )
 150 #define VFLIP_TEXT N_( "Vertical flip" )
 151 #define VFLIP_LONGTEXT N_( \
 152     "Flip the video vertically (if supported by the v4l2 driver)." )
 153 #define HCENTER_TEXT N_( "Horizontal centering" )
 154 #define HCENTER_LONGTEXT N_( \
 155     "Set the camera's horizontal centering (if supported by the v4l2 driver)." )
 156 #define VCENTER_TEXT N_( "Vertical centering" )
 157 #define VCENTER_LONGTEXT N_( \
 158     "Set the camera's vertical centering (if supported by the v4l2 driver)." )
 159
 160 #define AUDIO_VOLUME_TEXT N_( "Volume" )
 161 #define AUDIO_VOLUME_LONGTEXT N_( \
 162     "Volume of the audio input (if supported by the v4l2 driver)." )
 163 #define AUDIO_BALANCE_TEXT N_( "Balance" )
 164 #define AUDIO_BALANCE_LONGTEXT N_( \
 165     "Balance of the audio input (if supported by the v4l2 driver)." )
 166 #define AUDIO_MUTE_TEXT N_( "Mute" )
 167 #define AUDIO_MUTE_LONGTEXT N_( \
 168     "Mute audio input (if supported by the v4l2 driver)." )
 169 #define AUDIO_BASS_TEXT N_( "Bass" )
 170 #define AUDIO_BASS_LONGTEXT N_( \
 171     "Bass level of the audio input (if supported by the v4l2 driver)." )
 172 #define AUDIO_TREBLE_TEXT N_( "Treble" )
 173 #define AUDIO_TREBLE_LONGTEXT N_( \
 174     "Treble level of the audio input (if supported by the v4l2 driver)." )
 175 #define AUDIO_LOUDNESS_TEXT N_( "Loudness" )
 176 #define AUDIO_LOUDNESS_LONGTEXT N_( \
 177     "Loudness of the audio input (if supported by the v4l2 driver)." )
 178
 179 #define CACHING_TEXT N_("Caching value in ms")
 180 #define CACHING_LONGTEXT N_( \
 181     "Caching value for V4L2 captures. This " \
 182     "value should be set in milliseconds." )
 183 #define S_CTRLS_TEXT N_("v4l2 driver controls")
 184 #define S_CTRLS_LONGTEXT N_( \
 185     "Set the v4l2 driver controls to the values specified using a comma " \
 186     "separated list optionally encapsulated by curly braces " \
 187     "(e.g.: {video_bitrate=6000000,audio_crc=0,stream_type=3} ). " \
 188     "To list available controls, increase verbosity (-vvv) " \
 189     "or use the v4l2-ctl application." )
 190
 191 #define TUNER_TEXT N_("Tuner id")
 192 #define TUNER_LONGTEXT N_( \
 193     "Tuner id (see debug output)." )
 194 #define FREQUENCY_TEXT N_("Frequency")
 195 #define FREQUENCY_LONGTEXT N_( \
 196     "Tuner frequency in Hz or kHz (see debug output)" )
 197 #define TUNER_AUDIO_MODE_TEXT N_("Audio mode")
 198 #define TUNER_AUDIO_MODE_LONGTEXT N_( \
 199     "Tuner audio mono/stereo and track selection." )
 200
 201 #define AUDIO_DEPRECATED_ERROR N_( \
 202     "Alsa or OSS audio capture in the v4l2 access is deprecated. " \
 203     "please use 'v4l2:/""/ :input-slave=alsa:/""/' or " \
 204     "'v4l2:/""/ :input-slave=oss:/""/' instead." )
 205
 206 typedef enum {
 207     IO_METHOD_READ,
 208     IO_METHOD_MMAP,
 209     IO_METHOD_USERPTR,
 210 } io_method;
 211
 212 static const int i_standards_list[] =
 213     { V4L2_STD_UNKNOWN, V4L2_STD_SECAM, V4L2_STD_PAL, V4L2_STD_NTSC };
 214 static const char *const psz_standards_list_text[] =
 215     { N_("Default"), N_("SECAM"), N_("PAL"),  N_("NTSC") };
 216
 217 static const int i_iomethod_list[] =
 218     { IO_METHOD_READ, IO_METHOD_MMAP, IO_METHOD_USERPTR };
 219 static const char *const psz_iomethod_list_text[] =
 220     { N_("READ"), N_("MMAP"),  N_("USERPTR") };
 221
 222 static const int i_tuner_audio_modes_list[] =
 223     { V4L2_TUNER_MODE_MONO, V4L2_TUNER_MODE_STEREO,
 224       V4L2_TUNER_MODE_LANG1, V4L2_TUNER_MODE_LANG2,
 225       V4L2_TUNER_MODE_SAP, V4L2_TUNER_MODE_LANG1_LANG2 };
 226 static const char *const psz_tuner_audio_modes_list_text[] =
 227     { N_( "Mono" ),
 228       N_( "Stereo" ),
 229       N_( "Primary language (Analog TV tuners only)" ),
 230       N_( "Secondary language (Analog TV tuners only)" ),
 231       N_( "Second audio program (Analog TV tuners only)" ),
 232       N_( "Primary language left, Secondary language right" ) };
 233
 234 #define V4L2_DEFAULT "/dev/video0"
 235 #define CFG_PREFIX "v4l2-"
 236
 237 vlc_module_begin ()
 238     set_shortname( N_("Video4Linux2") )
 239     set_description( N_("Video4Linux2 input") )
 240     set_category( CAT_INPUT )
 241     set_subcategory( SUBCAT_INPUT_ACCESS )
 242
 243     set_section( N_( "Video input" ), NULL )
 244     add_integer( CFG_PREFIX "standard", 0, NULL, STANDARD_TEXT,
 245                  STANDARD_LONGTEXT, false )
 246         change_integer_list( i_standards_list, psz_standards_list_text, NULL )
 247     add_string( CFG_PREFIX "chroma", NULL, NULL, CHROMA_TEXT, CHROMA_LONGTEXT,
 248                 true )
 249     add_integer( CFG_PREFIX "input", 0, NULL, INPUT_TEXT, INPUT_LONGTEXT,
 250                 true )
 251     add_integer( CFG_PREFIX "audio-input", 0, NULL, AUDIO_INPUT_TEXT,
 252                  AUDIO_INPUT_LONGTEXT, true )
 253     add_integer( CFG_PREFIX "io", IO_METHOD_MMAP, NULL, IOMETHOD_TEXT,
 254                  IOMETHOD_LONGTEXT, true )
 255         change_integer_list( i_iomethod_list, psz_iomethod_list_text, NULL )
 256     add_integer( CFG_PREFIX "width", -1, NULL, WIDTH_TEXT,
 257                 WIDTH_LONGTEXT, true )
 258     add_integer( CFG_PREFIX "height", -1, NULL, HEIGHT_TEXT,
 259                 HEIGHT_LONGTEXT, true )
 260     add_float( CFG_PREFIX "fps", 0, NULL, FPS_TEXT, FPS_LONGTEXT, true )
 261     add_integer( CFG_PREFIX "caching", DEFAULT_PTS_DELAY / 1000, NULL,
 262                 CACHING_TEXT, CACHING_LONGTEXT, true )
 263 #ifdef HAVE_LIBV4L2
 264     add_bool( CFG_PREFIX "use-libv4l2", false, NULL, LIBV4L2_TEXT, LIBV4L2_LONGTEXT, true );
 265 #endif
 266
 267     set_section( N_( "Tuner" ), NULL )
 268     add_integer( CFG_PREFIX "tuner", 0, NULL, TUNER_TEXT, TUNER_LONGTEXT,
 269                  true )
 270     add_integer( CFG_PREFIX "tuner-frequency", -1, NULL, FREQUENCY_TEXT,
 271                  FREQUENCY_LONGTEXT, true )
 272     add_integer( CFG_PREFIX "tuner-audio-mode", -1, NULL, TUNER_AUDIO_MODE_TEXT,
 273                  TUNER_AUDIO_MODE_LONGTEXT, true )
 274         change_integer_list( i_tuner_audio_modes_list,
 275                              psz_tuner_audio_modes_list_text, 0 )
 276
 277     set_section( N_( "Controls" ),
 278                  N_( "v4l2 driver controls, if supported by your v4l2 driver." ) )
 279     add_bool( CFG_PREFIX "controls-reset", false, NULL, CTRL_RESET_TEXT,
 280               CTRL_RESET_LONGTEXT, true )
 281     add_integer( CFG_PREFIX "brightness", -1, NULL, BRIGHTNESS_TEXT,
 282                  BRIGHTNESS_LONGTEXT, true )
 283     add_integer( CFG_PREFIX "contrast", -1, NULL, CONTRAST_TEXT,
 284                  CONTRAST_LONGTEXT, true )
 285     add_integer( CFG_PREFIX "saturation", -1, NULL, SATURATION_TEXT,
 286                  SATURATION_LONGTEXT, true )
 287     add_integer( CFG_PREFIX "hue", -1, NULL, HUE_TEXT,
 288                  HUE_LONGTEXT, true )
 289     add_integer( CFG_PREFIX "black-level", -1, NULL, BLACKLEVEL_TEXT,
 290                  BLACKLEVEL_LONGTEXT, true )
 291     add_integer( CFG_PREFIX "auto-white-balance", -1, NULL,
 292                  AUTOWHITEBALANCE_TEXT, AUTOWHITEBALANCE_LONGTEXT, true )
 293     add_integer( CFG_PREFIX "do-white-balance", -1, NULL, DOWHITEBALANCE_TEXT,
 294                  DOWHITEBALANCE_LONGTEXT, true )
 295     add_integer( CFG_PREFIX "red-balance", -1, NULL, REDBALANCE_TEXT,
 296                  REDBALANCE_LONGTEXT, true )
 297     add_integer( CFG_PREFIX "blue-balance", -1, NULL, BLUEBALANCE_TEXT,
 298                  BLUEBALANCE_LONGTEXT, true )
 299     add_integer( CFG_PREFIX "gamma", -1, NULL, GAMMA_TEXT,
 300                  GAMMA_LONGTEXT, true )
 301     add_integer( CFG_PREFIX "exposure", -1, NULL, EXPOSURE_TEXT,
 302                  EXPOSURE_LONGTEXT, true )
 303     add_integer( CFG_PREFIX "autogain", -1, NULL, AUTOGAIN_TEXT,
 304                  AUTOGAIN_LONGTEXT, true )
 305     add_integer( CFG_PREFIX "gain", -1, NULL, GAIN_TEXT,
 306                  GAIN_LONGTEXT, true )
 307     add_integer( CFG_PREFIX "hflip", -1, NULL, HFLIP_TEXT,
 308                  HFLIP_LONGTEXT, true )
 309     add_integer( CFG_PREFIX "vflip", -1, NULL, VFLIP_TEXT,
 310                  VFLIP_LONGTEXT, true )
 311     add_integer( CFG_PREFIX "hcenter", -1, NULL, HCENTER_TEXT,
 312                  HCENTER_LONGTEXT, true )
 313     add_integer( CFG_PREFIX "vcenter", -1, NULL, VCENTER_TEXT,
 314                  VCENTER_LONGTEXT, true )
 315     add_integer( CFG_PREFIX "audio-volume", -1, NULL, AUDIO_VOLUME_TEXT,
 316                 AUDIO_VOLUME_LONGTEXT, true )
 317     add_integer( CFG_PREFIX "audio-balance", -1, NULL, AUDIO_BALANCE_TEXT,
 318                 AUDIO_BALANCE_LONGTEXT, true )
 319     add_bool( CFG_PREFIX "audio-mute", false, NULL, AUDIO_MUTE_TEXT,
 320               AUDIO_MUTE_LONGTEXT, true )
 321     add_integer( CFG_PREFIX "audio-bass", -1, NULL, AUDIO_BASS_TEXT,
 322                 AUDIO_BASS_LONGTEXT, true )
 323     add_integer( CFG_PREFIX "audio-treble", -1, NULL, AUDIO_TREBLE_TEXT,
 324                 AUDIO_TREBLE_LONGTEXT, true )
 325     add_integer( CFG_PREFIX "audio-loudness", -1, NULL, AUDIO_LOUDNESS_TEXT,
 326                 AUDIO_LOUDNESS_LONGTEXT, true )
 327     add_string( CFG_PREFIX "set-ctrls", NULL, NULL, S_CTRLS_TEXT,
 328               S_CTRLS_LONGTEXT, true )
 329
 330     add_obsolete_string( CFG_PREFIX "dev" )
 331
 332     add_obsolete_string( CFG_PREFIX "adev" )
 333     add_obsolete_integer( CFG_PREFIX "audio-method" )
 334     add_obsolete_bool( CFG_PREFIX "stereo" )
 335     add_obsolete_integer( CFG_PREFIX "samplerate" )
 336
 337     add_shortcut( "v4l2" )
 338     set_capability( "access_demux", 10 )
 339     set_callbacks( DemuxOpen, DemuxClose )
 340
 341     add_submodule ()
 342     add_shortcut( "v4l2" )
 343     add_shortcut( "v4l2c" )
 344     set_description( N_("Video4Linux2 Compressed A/V") )
 345     set_capability( "access", 0 )
 346     /* use these when open as access_demux fails; VLC will use another demux */
 347     set_callbacks( AccessOpen, AccessClose )
 348
 349 vlc_module_end ()
 350
 351 /*****************************************************************************
 352  * Access: local prototypes
 353  *****************************************************************************/
 354
 355 static void CommonClose( vlc_object_t *, demux_sys_t * );
 356 static void ParseMRL( demux_sys_t *, char *, vlc_object_t * );
 357 static void GetV4L2Params( demux_sys_t *, vlc_object_t * );
 358 static void SetAvailControlsByString( vlc_object_t *, demux_sys_t *, int );
 359
 360 static int DemuxControl( demux_t *, int, va_list );
 361 static int AccessControl( access_t *, int, va_list );
 362
 363 static int Demux( demux_t * );
 364 static block_t *AccessRead( access_t * );
 365
 366 static block_t* GrabVideo( vlc_object_t *p_demux, demux_sys_t *p_sys );
 367 static block_t* ProcessVideoFrame( vlc_object_t *p_demux, uint8_t *p_frame, size_t );
 368
 369 static bool IsPixelFormatSupported( demux_t *p_demux,
 370                                           unsigned int i_pixelformat );
 371
 372 static int OpenVideoDev( vlc_object_t *, demux_sys_t *, bool );
 373 static bool ProbeVideoDev( vlc_object_t *, demux_sys_t *,
 374                                  const char *psz_device );
 375
 376 static int ControlList( vlc_object_t *, demux_sys_t *, int , bool, bool );
 377 static int Control( vlc_object_t *, demux_sys_t *, int i_fd,
 378                     const char *psz_name, int i_cid, int i_value );
 379
 380 static int DemuxControlCallback( vlc_object_t *p_this, const char *psz_var,
 381                                  vlc_value_t oldval, vlc_value_t newval,
 382                                  void *p_data );
 383 static int DemuxControlResetCallback( vlc_object_t *p_this, const char *psz_var,
 384                                       vlc_value_t oldval, vlc_value_t newval,
 385                                       void *p_data );
 386 static int AccessControlCallback( vlc_object_t *p_this, const char *psz_var,
 387                                   vlc_value_t oldval, vlc_value_t newval,
 388                                   void *p_data );
 389 static int AccessControlResetCallback( vlc_object_t *p_this,
 390                                        const char *psz_var, vlc_value_t oldval,
 391                                        vlc_value_t newval, void *p_data );
 392
 393 static const struct
 394 {
 395     unsigned int i_v4l2;
 396     vlc_fourcc_t i_fourcc;
 397     int i_rmask;
 398     int i_gmask;
 399     int i_bmask;
 400 } v4l2chroma_to_fourcc[] =
 401 {
 402     /* Raw data types */
 403     { V4L2_PIX_FMT_GREY,    VLC_CODEC_GREY, 0, 0, 0 },
 404     { V4L2_PIX_FMT_HI240,   VLC_FOURCC('I','2','4','0'), 0, 0, 0 },
 405     { V4L2_PIX_FMT_RGB555,  VLC_CODEC_RGB15, 0x001f,0x03e0,0x7c00 },
 406     { V4L2_PIX_FMT_RGB565,  VLC_CODEC_RGB16, 0x001f,0x07e0,0xf800 },
 407     /* Won't work since we don't know how to handle such gmask values
 408      * correctly
 409     { V4L2_PIX_FMT_RGB555X, VLC_CODEC_RGB15, 0x007c,0xe003,0x1f00 },
 410     { V4L2_PIX_FMT_RGB565X, VLC_CODEC_RGB16, 0x00f8,0xe007,0x1f00 },
 411     */
 412     { V4L2_PIX_FMT_BGR24,   VLC_CODEC_RGB24, 0xff0000,0xff00,0xff },
 413     { V4L2_PIX_FMT_RGB24,   VLC_CODEC_RGB24, 0xff,0xff00,0xff0000 },
 414     { V4L2_PIX_FMT_BGR32,   VLC_CODEC_RGB32, 0xff0000,0xff00,0xff },
 415     { V4L2_PIX_FMT_RGB32,   VLC_CODEC_RGB32, 0xff,0xff00,0xff0000 },
 416     { V4L2_PIX_FMT_YUYV,    VLC_CODEC_YUYV, 0, 0, 0 },
 417     { V4L2_PIX_FMT_UYVY,    VLC_CODEC_UYVY, 0, 0, 0 },
 418     { V4L2_PIX_FMT_Y41P,    VLC_FOURCC('I','4','1','N'), 0, 0, 0 },
 419     { V4L2_PIX_FMT_YUV422P, VLC_CODEC_I422, 0, 0, 0 },
 420     { V4L2_PIX_FMT_YVU420,  VLC_CODEC_YV12, 0, 0, 0 },
 421     { V4L2_PIX_FMT_YUV411P, VLC_CODEC_I411, 0, 0, 0 },
 422     { V4L2_PIX_FMT_YUV410,  VLC_CODEC_I410, 0, 0, 0 },
 423
 424     /* Raw data types, not in V4L2 spec but still in videodev2.h and supported
 425      * by VLC */
 426     { V4L2_PIX_FMT_YUV420,  VLC_CODEC_I420, 0, 0, 0 },
 427     /* FIXME { V4L2_PIX_FMT_RGB444,  VLC_CODEC_RGB32 }, */
 428
 429     /* Compressed data types */
 430     { V4L2_PIX_FMT_MJPEG,   VLC_CODEC_MJPG, 0, 0, 0 },
 431     { V4L2_PIX_FMT_JPEG,    VLC_CODEC_JPEG, 0, 0, 0 },
 432 #if 0
 433     { V4L2_PIX_FMT_DV,      VLC_FOURCC('?','?','?','?') },
 434     { V4L2_PIX_FMT_MPEG,    VLC_FOURCC('?','?','?','?') },
 435 #endif
 436     { 0, 0, 0, 0, 0 }
 437 };
 438
 439 /**
 440  * List of V4L2 chromas were confident enough to use as fallbacks if the
 441  * user hasn't provided a --v4l2-chroma value.
 442  *
 443  * Try YUV chromas first, then RGB little endian and MJPEG as last resort.
 444  */
 445 static const __u32 p_chroma_fallbacks[] =
 446 { V4L2_PIX_FMT_YUV420, V4L2_PIX_FMT_YVU420, V4L2_PIX_FMT_YUV422P,
 447   V4L2_PIX_FMT_YUYV, V4L2_PIX_FMT_UYVY, V4L2_PIX_FMT_BGR24,
 448   V4L2_PIX_FMT_BGR32, V4L2_PIX_FMT_MJPEG, V4L2_PIX_FMT_JPEG };
 449
 450 static const struct
 451 {
 452     const char *psz_name;
 453     unsigned int i_cid;
 454 } controls[] =
 455 {
 456     { "brightness", V4L2_CID_BRIGHTNESS },
 457     { "contrast", V4L2_CID_CONTRAST },
 458     { "saturation", V4L2_CID_SATURATION },
 459     { "hue", V4L2_CID_HUE },
 460     { "audio-volume", V4L2_CID_AUDIO_VOLUME },
 461     { "audio-balance", V4L2_CID_AUDIO_BALANCE },
 462     { "audio-bass", V4L2_CID_AUDIO_BASS },
 463     { "audio-treble", V4L2_CID_AUDIO_TREBLE },
 464     { "audio-mute", V4L2_CID_AUDIO_MUTE },
 465     { "audio-loudness", V4L2_CID_AUDIO_LOUDNESS },
 466     { "black-level", V4L2_CID_BLACK_LEVEL },
 467     { "auto-white-balance", V4L2_CID_AUTO_WHITE_BALANCE },
 468     { "do-white-balance", V4L2_CID_DO_WHITE_BALANCE },
 469     { "red-balance", V4L2_CID_RED_BALANCE },
 470     { "blue-balance", V4L2_CID_BLUE_BALANCE },
 471     { "gamma", V4L2_CID_GAMMA },
 472     { "exposure", V4L2_CID_EXPOSURE },
 473     { "autogain", V4L2_CID_AUTOGAIN },
 474     { "gain", V4L2_CID_GAIN },
 475     { "hflip", V4L2_CID_HFLIP },
 476     { "vflip", V4L2_CID_VFLIP },
 477     { "hcenter", V4L2_CID_HCENTER },
 478     { "vcenter", V4L2_CID_VCENTER },
 479     { NULL, 0 }
 480 };
 481
 482 struct buffer_t
 483 {
 484     void *  start;
 485     size_t  length;
 486 };
 487
 488 struct demux_sys_t
 489 {
 490     char *psz_device;  /* Main device from MRL */
 491     int  i_fd;
 492
 493     char *psz_requested_chroma;
 494
 495     /* Video */
 496     io_method io;
 497
 498     int i_cache;
 499
 500     struct v4l2_capability dev_cap;
 501
 502     int i_input;
 503     struct v4l2_input *p_inputs;
 504     int i_selected_input;
 505
 506     int i_standard;
 507     struct v4l2_standard *p_standards;
 508     v4l2_std_id i_selected_standard_id;
 509
 510     int i_audio;
 511     /* V4L2 devices cannot have more than 32 audio inputs */
 512     struct v4l2_audio p_audios[32];
 513     int i_selected_audio_input;
 514
 515     int i_tuner;
 516     struct v4l2_tuner *p_tuners;
 517
 518     int i_codec;
 519     struct v4l2_fmtdesc *p_codecs;
 520
 521     struct buffer_t *p_buffers;
 522     unsigned int i_nbuffers;
 523
 524     int i_width;
 525     int i_height;
 526     float f_fps;            /* <= 0.0 mean to grab at full rate */
 527     mtime_t i_video_pts;    /* only used when f_fps > 0 */
 528     int i_fourcc;
 529
 530     es_out_id_t *p_es;
 531
 532     /* Tuner */
 533     int i_cur_tuner;
 534     int i_frequency;
 535     int i_audio_mode;
 536
 537     /* Controls */
 538     char *psz_set_ctrls;
 539
 540
 541 #ifdef HAVE_LIBV4L2
 542     /* */
 543     int (*pf_close)( int );
 544     int (*pf_dup)( int );
 545     int (*pf_ioctl)( int, unsigned long int, ... );
 546     ssize_t (*pf_read)( int, void *, size_t );
 547     void *(*pf_mmap)( void *, size_t, int, int, int, off_t );
 548     int (*pf_munmap)( void *, size_t );
 549     bool b_libv4l2;
 550 #endif
 551 };
 552
 553 #ifdef HAVE_LIBV4L2
 554 static void use_kernel_v4l2( demux_sys_t *p_sys )
 555 {
 556     p_sys->pf_close = close;
 557     p_sys->pf_dup = dup;
 558     p_sys->pf_ioctl = ioctl;
 559     p_sys->pf_read = read;
 560     p_sys->pf_mmap = mmap;
 561     p_sys->pf_munmap = munmap;
 562     p_sys->b_libv4l2 = false;
 563 }
 564
 565 static void use_libv4l2( demux_sys_t *p_sys )
 566 {
 567     p_sys->pf_close = v4l2_close;
 568     p_sys->pf_dup = v4l2_dup;
 569     p_sys->pf_ioctl = v4l2_ioctl;
 570     p_sys->pf_read = v4l2_read;
 571     p_sys->pf_mmap = v4l2_mmap;
 572     p_sys->pf_munmap = v4l2_munmap;
 573     p_sys->b_libv4l2 = true;
 574 }
 575
 576 #   define v4l2_close (p_sys->pf_close)
 577 #   define v4l2_dup (p_sys->pf_dup)
 578 #   define v4l2_ioctl (p_sys->pf_ioctl)
 579 #   define v4l2_read (p_sys->pf_read)
 580 #   define v4l2_mmap (p_sys->pf_mmap)
 581 #   define v4l2_munmap (p_sys->pf_munmap)
 582 #else
 583 #   define v4l2_close close
 584 #   define v4l2_dup dup
 585 #   define v4l2_ioctl ioctl
 586 #   define v4l2_read read
 587 #   define v4l2_mmap mmap
 588 #   define v4l2_munmap munmap
 589 #endif
 590
 591 static int FindMainDevice( vlc_object_t *p_this, demux_sys_t *p_sys,
 592                            bool b_demux )
 593 {
 594     /* TODO: if using default device, loop through all /dev/video* until
 595      * one works */
 596     msg_Dbg( p_this, "opening device '%s'", p_sys->psz_device );
 597     if( ProbeVideoDev( p_this, p_sys, p_sys->psz_device ) )
 598     {
 599         msg_Dbg( p_this, "'%s' is a video device", p_sys->psz_device );
 600         p_sys->i_fd = OpenVideoDev( p_this, p_sys, b_demux );
 601     }
 602
 603     if( p_sys->i_fd < 0 ) return VLC_EGENERIC;
 604     return VLC_SUCCESS;
 605 }
 606
 607 /*****************************************************************************
 608  * DemuxOpen: opens v4l2 device, access_demux callback
 609  *****************************************************************************
 610  *
 611  * url: <video device>::::
 612  *
 613  *****************************************************************************/
 614 static int DemuxOpen( vlc_object_t *p_this )
 615 {
 616     demux_t     *p_demux = (demux_t*)p_this;
 617     demux_sys_t *p_sys;
 618
 619     /* Only when selected */
 620     if( strcmp( p_demux->psz_access, "v4l2" ) )
 621         return VLC_EGENERIC;
 622
 623     /* Set up p_demux */
 624     p_demux->pf_control = DemuxControl;
 625     p_demux->pf_demux = Demux;
 626     p_demux->info.i_update = 0;
 627     p_demux->info.i_title = 0;
 628     p_demux->info.i_seekpoint = 0;
 629
 630     p_demux->p_sys = p_sys = calloc( 1, sizeof( demux_sys_t ) );
 631     if( p_sys == NULL ) return VLC_ENOMEM;
 632
 633     GetV4L2Params(p_sys, (vlc_object_t *) p_demux);
 634
 635     ParseMRL( p_sys, p_demux->psz_path, (vlc_object_t *) p_demux );
 636
 637 #ifdef HAVE_LIBV4L2
 638     if( !config_GetInt( p_this, CFG_PREFIX "use-libv4l2" ) )
 639     {
 640         msg_Dbg( p_this, "Trying direct kernel v4l2" );
 641         use_kernel_v4l2( p_sys );
 642         if( FindMainDevice( p_this, p_sys, true ) == VLC_SUCCESS)
 643             return VLC_SUCCESS;
 644     }
 645
 646     msg_Dbg( p_this, "Trying libv4l2 wrapper" );
 647     use_libv4l2( p_sys );
 648 #endif
 649     if( FindMainDevice( p_this, p_sys, true ) == VLC_SUCCESS)
 650         return VLC_SUCCESS;
 651
 652     DemuxClose( p_this );
 653     return VLC_EGENERIC;
 654 }
 655
 656 /*****************************************************************************
 657  * GetV4L2Params: fill in p_sys parameters (shared by DemuxOpen and AccessOpen)
 658  *****************************************************************************/
 659 static void GetV4L2Params( demux_sys_t *p_sys, vlc_object_t *p_obj )
 660 {
 661     p_sys->i_video_pts = -1;
 662
 663     p_sys->i_selected_standard_id =
 664         i_standards_list[var_CreateGetInteger( p_obj, "v4l2-standard" )];
 665
 666     p_sys->i_selected_input = var_CreateGetInteger( p_obj, "v4l2-input" );
 667     p_sys->i_selected_audio_input =
 668         var_CreateGetInteger( p_obj, "v4l2-audio-input" );
 669
 670     p_sys->io = var_CreateGetInteger( p_obj, "v4l2-io" );
 671
 672     p_sys->i_width = var_CreateGetInteger( p_obj, "v4l2-width" );
 673     p_sys->i_height = var_CreateGetInteger( p_obj, "v4l2-height" );
 674
 675     var_Create( p_obj, "v4l2-controls-reset", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
 676
 677     p_sys->f_fps = var_CreateGetFloat( p_obj, "v4l2-fps" );
 678     p_sys->psz_requested_chroma = var_CreateGetString( p_obj, "v4l2-chroma" );
 679
 680     p_sys->i_cache = var_CreateGetInteger( p_obj, "v4l2-caching" );
 681
 682     p_sys->i_cur_tuner = var_CreateGetInteger( p_obj, "v4l2-tuner" );
 683     p_sys->i_frequency = var_CreateGetInteger( p_obj, "v4l2-tuner-frequency" );
 684     p_sys->i_audio_mode = var_CreateGetInteger( p_obj, "v4l2-tuner-audio-mode" );
 685
 686     p_sys->psz_set_ctrls = var_CreateGetString( p_obj, "v4l2-set-ctrls" );
 687
 688     p_sys->psz_device = NULL;
 689     p_sys->i_fd = -1;
 690
 691     p_sys->p_es = NULL;
 692 }
 693
 694 /*****************************************************************************
 695  * ParseMRL: parse the options contained in the MRL
 696  *****************************************************************************/
 697 static void ParseMRL( demux_sys_t *p_sys, char *psz_path, vlc_object_t *p_obj )
 698 {
 699     char *psz_dup = strdup( psz_path );
 700     char *psz_parser = psz_dup;
 701
 702     while( *psz_parser && *psz_parser != ':' )
 703     {
 704         psz_parser++;
 705     }
 706
 707     if( *psz_parser == ':' )
 708     {
 709         /* read options */
 710         for( ;; )
 711         {
 712             *psz_parser++ = '\0';
 713
 714             if( !strncmp( psz_parser, "standard=", strlen( "standard=" ) ) )
 715             {
 716                 psz_parser += strlen( "standard=" );
 717                 if( !strncmp( psz_parser, "pal", strlen( "pal" ) ) )
 718                 {
 719                     p_sys->i_selected_standard_id = V4L2_STD_PAL;
 720                     psz_parser += strlen( "pal" );
 721                 }
 722                 else if( !strncmp( psz_parser, "ntsc", strlen( "ntsc" ) ) )
 723                 {
 724                     p_sys->i_selected_standard_id = V4L2_STD_NTSC;
 725                     psz_parser += strlen( "ntsc" );
 726                 }
 727                 else if( !strncmp( psz_parser, "secam", strlen( "secam" ) ) )
 728                 {
 729                     p_sys->i_selected_standard_id = V4L2_STD_SECAM;
 730                     psz_parser += strlen( "secam" );
 731                 }
 732                 else if( !strncmp( psz_parser, "default", strlen( "default" ) ) )
 733                 {
 734                     p_sys->i_selected_standard_id = V4L2_STD_UNKNOWN;
 735                     psz_parser += strlen( "default" );
 736                 }
 737                 else
 738                 {
 739                     p_sys->i_selected_standard_id = i_standards_list[strtol( psz_parser, &psz_parser, 0 )];
 740                 }
 741             }
 742             else if( !strncmp( psz_parser, "chroma=", strlen( "chroma=" ) ) )
 743             {
 744                 int  i_len;
 745
 746                 psz_parser += strlen( "chroma=" );
 747                 if( strchr( psz_parser, ':' ) )
 748                 {
 749                     i_len = strchr( psz_parser, ':' ) - psz_parser;
 750                 }
 751                 else
 752                 {
 753                     i_len = strlen( psz_parser );
 754                 }
 755
 756                 free( p_sys->psz_requested_chroma );
 757                 p_sys->psz_requested_chroma = strndup( psz_parser, i_len );
 758
 759                 psz_parser += i_len;
 760             }
 761             else if( !strncmp( psz_parser, "input=", strlen( "input=" ) ) )
 762             {
 763                 p_sys->i_selected_input = strtol( psz_parser + strlen( "input=" ),
 764                                        &psz_parser, 0 );
 765             }
 766             else if( !strncmp( psz_parser, "audio-input=", strlen( "audio-input=" ) ) )
 767             {
 768                 p_sys->i_selected_audio_input = strtol( psz_parser + strlen( "audio-input=" ),
 769                                        &psz_parser, 0 );
 770             }
 771             else if( !strncmp( psz_parser, "fps=", strlen( "fps=" ) ) )
 772             {
 773                 p_sys->f_fps = strtof( psz_parser + strlen( "fps=" ),
 774                                        &psz_parser );
 775             }
 776             else if( !strncmp( psz_parser, "io=", strlen( "io=" ) ) )
 777             {
 778                 psz_parser += strlen( "io=" );
 779                 if( !strncmp( psz_parser, "read", strlen( "read" ) ) )
 780                 {
 781                     p_sys->io = IO_METHOD_READ;
 782                     psz_parser += strlen( "read" );
 783                 }
 784                 else if( !strncmp( psz_parser, "mmap", strlen( "mmap" ) ) )
 785                 {
 786                     p_sys->io = IO_METHOD_MMAP;
 787                     psz_parser += strlen( "mmap" );
 788                 }
 789                 else if( !strncmp( psz_parser, "userptr", strlen( "userptr" ) ) )
 790                 {
 791                     p_sys->io = IO_METHOD_USERPTR;
 792                     psz_parser += strlen( "userptr" );
 793                 }
 794                 else
 795                 {
 796                     p_sys->io = strtol( psz_parser, &psz_parser, 0 );
 797                 }
 798             }
 799             else if( !strncmp( psz_parser, "width=",
 800                                strlen( "width=" ) ) )
 801             {
 802                 p_sys->i_width =
 803                     strtol( psz_parser + strlen( "width=" ),
 804                             &psz_parser, 0 );
 805             }
 806             else if( !strncmp( psz_parser, "height=",
 807                                strlen( "height=" ) ) )
 808             {
 809                 p_sys->i_height =
 810                     strtol( psz_parser + strlen( "height=" ),
 811                             &psz_parser, 0 );
 812             }
 813             else if( !strncmp( psz_parser, "controls-reset",
 814                                strlen( "controls-reset" ) ) )
 815             {
 816                 var_SetBool( p_obj, "v4l2-controls-reset", true );
 817                 psz_parser += strlen( "controls-reset" );
 818             }
 819 #if 0
 820             else if( !strncmp( psz_parser, "brightness=",
 821                                strlen( "brightness=" ) ) )
 822             {
 823                 var_SetInteger( p_obj, "brightness",
 824                     strtol( psz_parser + strlen( "brightness=" ),
 825                             &psz_parser, 0 ) );
 826             }
 827             else if( !strncmp( psz_parser, "contrast=",
 828                                strlen( "contrast=" ) ) )
 829             {
 830                 var_SetInteger( p_obj, "contrast",
 831                     strtol( psz_parser + strlen( "contrast=" ),
 832                             &psz_parser, 0 ) );
 833             }
 834             else if( !strncmp( psz_parser, "saturation=",
 835                                strlen( "saturation=" ) ) )
 836             {
 837                 var_SetInteger( p_obj, "saturation",
 838                     strtol( psz_parser + strlen( "saturation=" ),
 839                             &psz_parser, 0 ) );
 840             }
 841             else if( !strncmp( psz_parser, "hue=",
 842                                strlen( "hue=" ) ) )
 843             {
 844                 var_SetInteger( p_obj, "hue",
 845                     strtol( psz_parser + strlen( "hue=" ),
 846                             &psz_parser, 0 ) );
 847             }
 848             else if( !strncmp( psz_parser, "gamma=",
 849                                strlen( "gamma=" ) ) )
 850             {
 851                 var_SetInteger( p_obj, "gamma",
 852                     strtol( psz_parser + strlen( "gamma=" ),
 853                             &psz_parser, 0 ) );
 854             }
 855 #endif
 856             else if( !strncmp( psz_parser, "caching=", strlen( "caching=" ) ) )
 857             {
 858                 p_sys->i_cache = strtol( psz_parser + strlen( "caching=" ),
 859                                          &psz_parser, 0 );
 860             }
 861             else if( !strncmp( psz_parser, "tuner=", strlen( "tuner=" ) ) )
 862             {
 863                 p_sys->i_cur_tuner = strtol( psz_parser + strlen( "tuner=" ),
 864                                          &psz_parser, 0 );
 865             }
 866             else if( !strncmp( psz_parser, "tuner-frequency=", strlen( "tuner-frequency=" ) ) )
 867             {
 868                 p_sys->i_frequency = strtol( psz_parser
 869                                           + strlen( "tuner-frequency=" ),
 870                                           &psz_parser, 0 );
 871             }
 872             else if( !strncmp( psz_parser, "tuner-audio-mode=", strlen( "tuner-audio-mode=" ) ) )
 873             {
 874                 p_sys->i_audio_mode = strtol( psz_parser
 875                                           + strlen( "tuner-audio-mode=" ),
 876                                           &psz_parser, 0 );
 877             }
 878             else if( !strncmp( psz_parser, "set-ctrls=", strlen( "set-ctrls=" )) )
 879             {
 880                 int  i_len;
 881
 882                 psz_parser += strlen( "set-ctrls=" );
 883                 if( strchr( psz_parser, ':' ) )
 884                 {
 885                     i_len = strchr( psz_parser, ':' ) - psz_parser;
 886                 }
 887                 else
 888                 {
 889                     i_len = strlen( psz_parser );
 890                 }
 891
 892                 p_sys->psz_set_ctrls = strndup( psz_parser, i_len );
 893
 894                 psz_parser += i_len;
 895             }
 896             else if( !strncmp( psz_parser, "adev=", strlen( "adev=" ) )
 897              || !strncmp( psz_parser, "samplerate=", strlen( "samplerate=" ) )
 898              || !strncmp( psz_parser, "audio-method", strlen( "audio-method" ) )
 899              || !strncmp( psz_parser, "stereo", strlen( "stereo" ) )
 900              || !strncmp( psz_parser, "mono", strlen( "mono" ) ) )
 901             {
 902                 if( strchr( psz_parser, ':' ) )
 903                 {
 904                     psz_parser = strchr( psz_parser, ':' );
 905                 }
 906                 else
 907                 {
 908                     psz_parser += strlen( psz_parser );
 909                 }
 910
 911                 msg_Err( p_obj, AUDIO_DEPRECATED_ERROR );
 912             }
 913             else
 914             {
 915                 char *psz_unk = strchr( psz_parser, ':' );
 916                 if (psz_unk)
 917                     psz_unk = strndup( psz_parser, psz_unk - psz_parser );
 918                 else
 919                     psz_unk = strdup( psz_parser);
 920                 msg_Warn( p_obj, "unknown option %s", psz_unk );
 921                 free (psz_unk);
 922             }
 923
 924             while( *psz_parser && *psz_parser != ':' )
 925             {
 926                 psz_parser++;
 927             }
 928
 929             if( *psz_parser == '\0' )
 930             {
 931                 break;
 932             }
 933         }
 934     }
 935
 936     /* Main device */
 937     if( *psz_dup )
 938         p_sys->psz_device = strdup( psz_dup );
 939     else
 940         p_sys->psz_device = strdup( V4L2_DEFAULT );
 941     free( psz_dup );
 942 }
 943
 944 /*****************************************************************************
 945  * Close: close device, free resources
 946  *****************************************************************************/
 947 static void AccessClose( vlc_object_t *p_this )
 948 {
 949     access_t    *p_access = (access_t *)p_this;
 950     demux_sys_t *p_sys   = (demux_sys_t *) p_access->p_sys;
 951
 952     CommonClose( p_this, p_sys );
 953 }
 954
 955 static void DemuxClose( vlc_object_t *p_this )
 956 {
 957     struct v4l2_buffer buf;
 958     enum v4l2_buf_type buf_type;
 959     unsigned int i;
 960
 961     demux_t     *p_demux = (demux_t *)p_this;
 962     demux_sys_t *p_sys   = p_demux->p_sys;
 963
 964     /* Stop video capture */
 965     if( p_sys->i_fd >= 0 )
 966     {
 967         switch( p_sys->io )
 968         {
 969         case IO_METHOD_READ:
 970             /* Nothing to do */
 971             break;
 972
 973         case IO_METHOD_MMAP:
 974         case IO_METHOD_USERPTR:
 975             /* Some drivers 'hang' internally if this is not done before streamoff */
 976             for( unsigned int i = 0; i < p_sys->i_nbuffers; i++ )
 977             {
 978                 memset( &buf, 0, sizeof(buf) );
 979                 buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 980                 buf.memory = ( p_sys->io == IO_METHOD_USERPTR ) ?
 981                     V4L2_MEMORY_USERPTR : V4L2_MEMORY_MMAP;
 982                 v4l2_ioctl( p_sys->i_fd, VIDIOC_DQBUF, &buf ); /* ignore result */
 983             }
 984
 985             buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 986             if( v4l2_ioctl( p_sys->i_fd, VIDIOC_STREAMOFF, &buf_type ) < 0 ) {
 987                 msg_Err( p_this, "VIDIOC_STREAMOFF failed" );
 988             }
 989
 990             break;
 991         }
 992     }
 993
 994     /* Free Video Buffers */
 995     if( p_sys->p_buffers ) {
 996         switch( p_sys->io )
 997         {
 998         case IO_METHOD_READ:
 999             free( p_sys->p_buffers[0].start );
1000             break;
1001
1002         case IO_METHOD_MMAP:
1003             for( i = 0; i < p_sys->i_nbuffers; ++i )
1004             {
1005                 if( v4l2_munmap( p_sys->p_buffers[i].start, p_sys->p_buffers[i].length ) )
1006                 {
1007                     msg_Err( p_this, "munmap failed" );
1008                 }
1009             }
1010             break;
1011
1012         case IO_METHOD_USERPTR:
1013             for( i = 0; i < p_sys->i_nbuffers; ++i )
1014             {
1015                free( p_sys->p_buffers[i].start );
1016             }
1017             break;
1018         }
1019         free( p_sys->p_buffers );
1020     }
1021
1022     CommonClose( p_this, p_sys );
1023 }
1024
1025 static void CommonClose( vlc_object_t *p_this, demux_sys_t *p_sys )
1026 {
1027     (void)p_this;
1028     /* Close */
1029     if( p_sys->i_fd >= 0 ) v4l2_close( p_sys->i_fd );
1030     free( p_sys->psz_device );
1031     free( p_sys->p_standards );
1032     free( p_sys->p_inputs );
1033     free( p_sys->p_tuners );
1034     free( p_sys->p_codecs );
1035     free( p_sys->psz_requested_chroma );
1036     free( p_sys->psz_set_ctrls );
1037
1038     free( p_sys );
1039 }
1040
1041 /*****************************************************************************
1042  * AccessOpen: opens v4l2 device, access callback
1043  *****************************************************************************
1044  *
1045  * url: <video device>::::
1046  *
1047  *****************************************************************************/
1048 static int AccessOpen( vlc_object_t * p_this )
1049 {
1050     access_t *p_access = (access_t*) p_this;
1051     demux_sys_t * p_sys;
1052
1053     /* Only when selected */
1054     if( *p_access->psz_access == '\0' ) return VLC_EGENERIC;
1055
1056     access_InitFields( p_access );
1057     ACCESS_SET_CALLBACKS( NULL, AccessRead, AccessControl, NULL );
1058     p_sys = calloc( 1, sizeof( demux_sys_t ));
1059     if( !p_sys ) return VLC_ENOMEM;
1060     p_access->p_sys = (access_sys_t*)p_sys;
1061
1062     GetV4L2Params( p_sys, (vlc_object_t *) p_access );
1063
1064     ParseMRL( p_sys, p_access->psz_path, (vlc_object_t *) p_access );
1065
1066 #ifdef HAVE_LIBV4L2
1067     if( !config_GetInt( p_this, CFG_PREFIX "use-libv4l2" ) )
1068     {
1069         msg_Dbg( p_this, "Trying direct kernel v4l2" );
1070         use_kernel_v4l2( p_sys );
1071         if( FindMainDevice( p_this, p_sys, false ) == VLC_SUCCESS)
1072             return VLC_SUCCESS;
1073     }
1074
1075     msg_Dbg( p_this, "Trying libv4l2 wrapper" );
1076     use_libv4l2( p_sys );
1077 #endif
1078     if( FindMainDevice( p_this, p_sys, false ) == VLC_SUCCESS )
1079         return VLC_SUCCESS;
1080
1081     AccessClose( p_this );
1082     return VLC_EGENERIC;
1083 }
1084
1085 /*****************************************************************************
1086  * DemuxControl:
1087  *****************************************************************************/
1088 static int DemuxControl( demux_t *p_demux, int i_query, va_list args )
1089 {
1090     switch( i_query )
1091     {
1092         /* Special for access_demux */
1093         case DEMUX_CAN_PAUSE:
1094         case DEMUX_CAN_SEEK:
1095         case DEMUX_SET_PAUSE_STATE:
1096         case DEMUX_CAN_CONTROL_PACE:
1097             *va_arg( args, bool * ) = false;
1098             return VLC_SUCCESS;
1099
1100         case DEMUX_GET_PTS_DELAY:
1101             *va_arg(args,int64_t *) = (int64_t)p_demux->p_sys->i_cache*1000;
1102             return VLC_SUCCESS;
1103
1104         case DEMUX_GET_TIME:
1105             *va_arg( args, int64_t * ) = mdate();
1106             return VLC_SUCCESS;
1107
1108         /* TODO implement others */
1109         default:
1110             return VLC_EGENERIC;
1111     }
1112
1113     return VLC_EGENERIC;
1114 }
1115
1116 /*****************************************************************************
1117  * AccessControl: access callback
1118  *****************************************************************************/
1119 static int AccessControl( access_t *p_access, int i_query, va_list args )
1120 {
1121     demux_sys_t  *p_sys = (demux_sys_t *) p_access->p_sys;
1122
1123     switch( i_query )
1124     {
1125         /* */
1126         case ACCESS_CAN_SEEK:
1127         case ACCESS_CAN_FASTSEEK:
1128         case ACCESS_CAN_PAUSE:
1129         case ACCESS_CAN_CONTROL_PACE:
1130             *va_arg( args, bool* ) = false;
1131             break;
1132
1133         /* */
1134         case ACCESS_GET_PTS_DELAY:
1135             *va_arg(args,int64_t *) = (int64_t)p_sys->i_cache*1000;
1136             break;
1137
1138         /* */
1139         case ACCESS_SET_PAUSE_STATE:
1140             /* Nothing to do */
1141             break;
1142
1143         case ACCESS_GET_TITLE_INFO:
1144         case ACCESS_SET_TITLE:
1145         case ACCESS_SET_SEEKPOINT:
1146         case ACCESS_SET_PRIVATE_ID_STATE:
1147         case ACCESS_GET_CONTENT_TYPE:
1148         case ACCESS_GET_META:
1149             return VLC_EGENERIC;
1150
1151         default:
1152             msg_Warn( p_access, "Unimplemented query in control(%d).", i_query);
1153             return VLC_EGENERIC;
1154
1155     }
1156     return VLC_SUCCESS;
1157 }
1158
1159 /*****************************************************************************
1160  * AccessRead: access callback
1161  ******************************************************************************/
1162 static block_t *AccessRead( access_t * p_access )
1163 {
1164     demux_sys_t *p_sys = (demux_sys_t *)p_access->p_sys;
1165
1166     struct pollfd fd;
1167     fd.fd = p_sys->i_fd;
1168     fd.events = POLLIN|POLLPRI;
1169     fd.revents = 0;
1170
1171     /* Wait for data */
1172     if( poll( &fd, 1, 500 ) ) /* Timeout after 0.5 seconds since I don't know if pf_demux can be blocking. */
1173     {
1174         if( fd.revents & (POLLIN|POLLPRI) )
1175         {
1176             return GrabVideo( VLC_OBJECT(p_access), p_sys );
1177         }
1178     }
1179
1180     return NULL;
1181 }
1182
1183 /*****************************************************************************
1184  * Demux: Processes the audio or video frame
1185  *****************************************************************************/
1186 static int Demux( demux_t *p_demux )
1187 {
1188     demux_sys_t *p_sys = p_demux->p_sys;
1189
1190     struct pollfd fd;
1191     fd.fd = p_sys->i_fd;
1192     fd.events = POLLIN|POLLPRI;
1193     fd.revents = 0;
1194
1195     /* Wait for data */
1196     if( poll( &fd, 1, 500 ) ) /* Timeout after 0.5 seconds since I don't know if pf_demux can be blocking. */
1197     {
1198         if( fd.revents & (POLLIN|POLLPRI) )
1199         {
1200             block_t *p_block = GrabVideo( VLC_OBJECT(p_demux), p_sys );
1201             if( p_block )
1202             {
1203                 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
1204                 es_out_Send( p_demux->out, p_sys->p_es, p_block );
1205             }
1206         }
1207     }
1208
1209     return 1;
1210 }
1211
1212 /*****************************************************************************
1213  * GrabVideo: Grab a video frame
1214  *****************************************************************************/
1215 static block_t* GrabVideo( vlc_object_t *p_demux, demux_sys_t *p_sys )
1216 {
1217     block_t *p_block = NULL;
1218     struct v4l2_buffer buf;
1219     ssize_t i_ret;
1220
1221     if( p_sys->f_fps >= 0.1 && p_sys->i_video_pts > 0 )
1222     {
1223         mtime_t i_dur = (mtime_t)((double)1000000 / (double)p_sys->f_fps);
1224
1225         /* Did we wait long enough ? (frame rate reduction) */
1226         if( p_sys->i_video_pts + i_dur > mdate() ) return 0;
1227     }
1228
1229     /* Grab Video Frame */
1230     switch( p_sys->io )
1231     {
1232     case IO_METHOD_READ:
1233         i_ret = v4l2_read( p_sys->i_fd, p_sys->p_buffers[0].start, p_sys->p_buffers[0].length );
1234         if( i_ret == -1 )
1235         {
1236             switch( errno )
1237             {
1238             case EAGAIN:
1239                 return 0;
1240             case EIO:
1241                 /* Could ignore EIO, see spec. */
1242                 /* fall through */
1243             default:
1244                 msg_Err( p_demux, "Failed to read frame" );
1245                 return 0;
1246                }
1247         }
1248
1249         p_block = ProcessVideoFrame( p_demux, (uint8_t*)p_sys->p_buffers[0].start, i_ret );
1250         if( !p_block ) return 0;
1251
1252         break;
1253
1254     case IO_METHOD_MMAP:
1255         memset( &buf, 0, sizeof(buf) );
1256         buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1257         buf.memory = V4L2_MEMORY_MMAP;
1258
1259         /* Wait for next frame */
1260         if (v4l2_ioctl( p_sys->i_fd, VIDIOC_DQBUF, &buf ) < 0 )
1261         {
1262             switch( errno )
1263             {
1264             case EAGAIN:
1265                 return 0;
1266             case EIO:
1267                 /* Could ignore EIO, see spec. */
1268                 /* fall through */
1269             default:
1270                 msg_Err( p_demux, "Failed to wait (VIDIOC_DQBUF)" );
1271                 return 0;
1272                }
1273         }
1274
1275         if( buf.index >= p_sys->i_nbuffers ) {
1276             msg_Err( p_demux, "Failed capturing new frame as i>=nbuffers" );
1277             return 0;
1278         }
1279
1280         p_block = ProcessVideoFrame( p_demux, p_sys->p_buffers[buf.index].start, buf.bytesused );
1281         if( !p_block ) return 0;
1282
1283         /* Unlock */
1284         if( v4l2_ioctl( p_sys->i_fd, VIDIOC_QBUF, &buf ) < 0 )
1285         {
1286             msg_Err( p_demux, "Failed to unlock (VIDIOC_QBUF)" );
1287             block_Release( p_block );
1288             return 0;
1289         }
1290
1291         break;
1292
1293     case IO_METHOD_USERPTR:
1294         memset( &buf, 0, sizeof(buf) );
1295         buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1296         buf.memory = V4L2_MEMORY_USERPTR;
1297
1298         /* Wait for next frame */
1299         if (v4l2_ioctl( p_sys->i_fd, VIDIOC_DQBUF, &buf ) < 0 )
1300         {
1301             switch( errno )
1302             {
1303             case EAGAIN:
1304                 return 0;
1305             case EIO:
1306                 /* Could ignore EIO, see spec. */
1307                 /* fall through */
1308             default:
1309                 msg_Err( p_demux, "Failed to wait (VIDIOC_DQBUF)" );
1310                 return 0;
1311             }
1312         }
1313
1314         /* Find frame? */
1315         unsigned int i;
1316         for( i = 0; i < p_sys->i_nbuffers; i++ )
1317         {
1318             if( buf.m.userptr == (unsigned long)p_sys->p_buffers[i].start &&
1319                 buf.length == p_sys->p_buffers[i].length ) break;
1320         }
1321
1322         if( i >= p_sys->i_nbuffers )
1323         {
1324             msg_Err( p_demux, "Failed capturing new frame as i>=nbuffers" );
1325             return 0;
1326         }
1327
1328         p_block = ProcessVideoFrame( p_demux, (uint8_t*)buf.m.userptr, buf.bytesused );
1329         if( !p_block ) return 0;
1330
1331         /* Unlock */
1332         if( v4l2_ioctl( p_sys->i_fd, VIDIOC_QBUF, &buf ) < 0 )
1333         {
1334             msg_Err( p_demux, "Failed to unlock (VIDIOC_QBUF)" );
1335             block_Release( p_block );
1336             return 0;
1337         }
1338
1339         break;
1340
1341     }
1342
1343     /* Timestamp */
1344     p_sys->i_video_pts = p_block->i_pts = p_block->i_dts = mdate();
1345
1346     return p_block;
1347 }
1348
1349 /*****************************************************************************
1350  * ProcessVideoFrame: Helper function to take a buffer and copy it into
1351  * a new block
1352  *****************************************************************************/
1353 static block_t* ProcessVideoFrame( vlc_object_t *p_demux, uint8_t *p_frame, size_t i_size )
1354 {
1355     block_t *p_block;
1356
1357     if( !p_frame ) return 0;
1358
1359     /* New block */
1360     if( !( p_block = block_New( p_demux, i_size ) ) )
1361     {
1362         msg_Warn( p_demux, "Cannot get new block" );
1363         return 0;
1364     }
1365
1366     /* Copy frame */
1367     memcpy( p_block->p_buffer, p_frame, i_size );
1368
1369     return p_block;
1370 }
1371
1372 /*****************************************************************************
1373  * Helper function to initalise video IO using the Read method
1374  *****************************************************************************/
1375 static int InitRead( vlc_object_t *p_demux, demux_sys_t *p_sys, unsigned int i_buffer_size )
1376 {
1377     (void)p_demux;
1378
1379     p_sys->p_buffers = calloc( 1, sizeof( *p_sys->p_buffers ) );
1380     if( !p_sys->p_buffers )
1381         return VLC_EGENERIC;
1382
1383     p_sys->p_buffers[0].length = i_buffer_size;
1384     p_sys->p_buffers[0].start = malloc( i_buffer_size );
1385     if( !p_sys->p_buffers[0].start )
1386         return VLC_ENOMEM;
1387
1388     return VLC_SUCCESS;
1389 }
1390
1391 /*****************************************************************************
1392  * Helper function to initalise video IO using the mmap method
1393  *****************************************************************************/
1394 static int InitMmap( vlc_object_t *p_demux, demux_sys_t *p_sys, int i_fd )
1395 {
1396     struct v4l2_requestbuffers req;
1397
1398     memset( &req, 0, sizeof(req) );
1399     req.count = 4;
1400     req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1401     req.memory = V4L2_MEMORY_MMAP;
1402
1403     if( v4l2_ioctl( i_fd, VIDIOC_REQBUFS, &req ) < 0 )
1404     {
1405         msg_Err( p_demux, "device does not support mmap i/o" );
1406         goto open_failed;
1407     }
1408
1409     if( req.count < 2 )
1410     {
1411         msg_Err( p_demux, "Insufficient buffer memory" );
1412         goto open_failed;
1413     }
1414
1415     p_sys->p_buffers = calloc( req.count, sizeof( *p_sys->p_buffers ) );
1416     if( !p_sys->p_buffers )
1417         goto open_failed;
1418
1419     for( p_sys->i_nbuffers = 0; p_sys->i_nbuffers < req.count; ++p_sys->i_nbuffers )
1420     {
1421         struct v4l2_buffer buf;
1422
1423         memset( &buf, 0, sizeof(buf) );
1424         buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1425         buf.memory = V4L2_MEMORY_MMAP;
1426         buf.index = p_sys->i_nbuffers;
1427
1428         if( v4l2_ioctl( i_fd, VIDIOC_QUERYBUF, &buf ) < 0 )
1429         {
1430             msg_Err( p_demux, "VIDIOC_QUERYBUF" );
1431             goto open_failed;
1432         }
1433
1434         p_sys->p_buffers[p_sys->i_nbuffers].length = buf.length;
1435         p_sys->p_buffers[p_sys->i_nbuffers].start =
1436             v4l2_mmap( NULL, buf.length, PROT_READ | PROT_WRITE, MAP_SHARED, i_fd, buf.m.offset );
1437
1438         if( p_sys->p_buffers[p_sys->i_nbuffers].start == MAP_FAILED )
1439         {
1440             msg_Err( p_demux, "mmap failed (%m)" );
1441             goto open_failed;
1442         }
1443     }
1444
1445     return VLC_SUCCESS;
1446
1447 open_failed:
1448     return VLC_EGENERIC;
1449
1450 }
1451
1452 /*****************************************************************************
1453  * Helper function to initalise video IO using the userbuf method
1454  *****************************************************************************/
1455 static int InitUserP( vlc_object_t *p_demux, demux_sys_t *p_sys, int i_fd, unsigned int i_buffer_size )
1456 {
1457     struct v4l2_requestbuffers req;
1458     unsigned int i_page_size;
1459
1460     i_page_size = sysconf(_SC_PAGESIZE);
1461     i_buffer_size = ( i_buffer_size + i_page_size - 1 ) & ~( i_page_size - 1);
1462
1463     memset( &req, 0, sizeof(req) );
1464     req.count = 4;
1465     req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1466     req.memory = V4L2_MEMORY_USERPTR;
1467
1468     if( v4l2_ioctl( i_fd, VIDIOC_REQBUFS, &req ) < 0 )
1469     {
1470         msg_Err( p_demux, "device does not support user pointer i/o" );
1471         return VLC_EGENERIC;
1472     }
1473
1474     p_sys->p_buffers = calloc( 4, sizeof( *p_sys->p_buffers ) );
1475     if( !p_sys->p_buffers )
1476         goto open_failed;
1477
1478     for( p_sys->i_nbuffers = 0; p_sys->i_nbuffers < 4; ++p_sys->i_nbuffers )
1479     {
1480         p_sys->p_buffers[p_sys->i_nbuffers].length = i_buffer_size;
1481         if( posix_memalign( &p_sys->p_buffers[p_sys->i_nbuffers].start,
1482                 /* boundary */ i_page_size, i_buffer_size ) )
1483             goto open_failed;
1484     }
1485
1486     return VLC_SUCCESS;
1487
1488 open_failed:
1489     free( p_sys->p_buffers );
1490     return VLC_EGENERIC;
1491
1492 }
1493
1494 /*****************************************************************************
1495  * IsPixelFormatSupported: returns true if the specified V4L2 pixel format is
1496  * in the array of supported formats returned by the driver
1497  *****************************************************************************/
1498 static bool IsPixelFormatSupported( demux_t *p_demux, unsigned int i_pixelformat )
1499 {
1500     demux_sys_t *p_sys = p_demux->p_sys;
1501
1502     for( int i_index = 0; i_index < p_sys->i_codec; i_index++ )
1503     {
1504         if( p_sys->p_codecs[i_index].pixelformat == i_pixelformat )
1505             return true;
1506     }
1507
1508     return false;
1509 }
1510
1511 static float GetMaxFrameRate( demux_t *p_demux, int i_fd,
1512                               uint32_t i_pixel_format,
1513                               uint32_t i_width, uint32_t i_height )
1514 {
1515     (void)p_demux;
1516 #ifdef VIDIOC_ENUM_FRAMEINTERVALS
1517 #ifdef HAVE_LIBV4L2
1518     demux_sys_t *p_sys = p_demux->p_sys;
1519 #endif
1520     /* This is new in Linux 2.6.19 */
1521     struct v4l2_frmivalenum frmival;
1522     memset( &frmival, 0, sizeof(frmival) );
1523     frmival.pixel_format = i_pixel_format;
1524     frmival.width = i_width;
1525     frmival.height = i_height;
1526     if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMEINTERVALS, &frmival ) >= 0 )
1527     {
1528         switch( frmival.type )
1529         {
1530             case V4L2_FRMIVAL_TYPE_DISCRETE:
1531             {
1532                 float f_fps_max = -1;
1533                 do
1534                 {
1535                     float f_fps = (float)frmival.discrete.denominator
1536                                 / (float)frmival.discrete.numerator;
1537                     if( f_fps > f_fps_max ) f_fps_max = f_fps;
1538                     frmival.index++;
1539                 } while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMEINTERVALS,
1540                                      &frmival ) >= 0 );
1541                 return f_fps_max;
1542             }
1543             case V4L2_FRMSIZE_TYPE_STEPWISE:
1544             case V4L2_FRMIVAL_TYPE_CONTINUOUS:
1545                 return __MAX( (float)frmival.stepwise.max.denominator
1546                             / (float)frmival.stepwise.max.numerator,
1547                               (float)frmival.stepwise.min.denominator
1548                             / (float)frmival.stepwise.min.numerator );
1549         }
1550     }
1551 #endif
1552     return -1.;
1553 }
1554
1555 static float GetAbsoluteMaxFrameRate( demux_t *p_demux, int i_fd,
1556                                       uint32_t i_pixel_format )
1557 {
1558     float f_fps_max = -1.;
1559 #ifdef VIDIOC_ENUM_FRAMESIZES
1560 #ifdef HAVE_LIBV4L2
1561     demux_sys_t *p_sys = p_demux->p_sys;
1562 #endif
1563     /* This is new in Linux 2.6.19 */
1564     struct v4l2_frmsizeenum frmsize;
1565     memset( &frmsize, 0, sizeof(frmsize) );
1566     frmsize.pixel_format = i_pixel_format;
1567     if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES, &frmsize ) >= 0 )
1568     {
1569         switch( frmsize.type )
1570         {
1571             case V4L2_FRMSIZE_TYPE_DISCRETE:
1572                 do
1573                 {
1574                     frmsize.index++;
1575                     float f_fps = GetMaxFrameRate( p_demux, i_fd,
1576                                                    i_pixel_format,
1577                                                    frmsize.discrete.width,
1578                                                    frmsize.discrete.height );
1579                     if( f_fps > f_fps_max ) f_fps_max = f_fps;
1580                 } while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES,
1581                          &frmsize ) >= 0 );
1582                 break;
1583             case V4L2_FRMSIZE_TYPE_STEPWISE:
1584             {
1585                 uint32_t i_width = frmsize.stepwise.min_width;
1586                 uint32_t i_height = frmsize.stepwise.min_height;
1587                 for( ;
1588                      i_width <= frmsize.stepwise.max_width &&
1589                      i_height <= frmsize.stepwise.max_width;
1590                      i_width += frmsize.stepwise.step_width,
1591                      i_height += frmsize.stepwise.step_height )
1592                 {
1593                     float f_fps = GetMaxFrameRate( p_demux, i_fd,
1594                                                    i_pixel_format,
1595                                                    i_width, i_height );
1596                     if( f_fps > f_fps_max ) f_fps_max = f_fps;
1597                 }
1598                 break;
1599             }
1600             case V4L2_FRMSIZE_TYPE_CONTINUOUS:
1601                 /* FIXME */
1602                 msg_Err( p_demux, "GetAbsoluteMaxFrameRate implementation for V4L2_FRMSIZE_TYPE_CONTINUOUS isn't correct" );
1603                  f_fps_max = GetMaxFrameRate( p_demux, i_fd,
1604                                               i_pixel_format,
1605                                               frmsize.stepwise.max_width,
1606                                               frmsize.stepwise.max_height );
1607                 break;
1608         }
1609     }
1610 #endif
1611     return f_fps_max;
1612 }
1613
1614 static void GetMaxDimensions( demux_t *p_demux, int i_fd,
1615                               uint32_t i_pixel_format, float f_fps_min,
1616                               uint32_t *pi_width, uint32_t *pi_height )
1617 {
1618     *pi_width = 0;
1619     *pi_height = 0;
1620 #ifdef VIDIOC_ENUM_FRAMESIZES
1621 #ifdef HAVE_LIBV4L2
1622     demux_sys_t *p_sys = p_demux->p_sys;
1623 #endif
1624     /* This is new in Linux 2.6.19 */
1625     struct v4l2_frmsizeenum frmsize;
1626     memset( &frmsize, 0, sizeof(frmsize) );
1627     frmsize.pixel_format = i_pixel_format;
1628     if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES, &frmsize ) >= 0 )
1629     {
1630         switch( frmsize.type )
1631         {
1632             case V4L2_FRMSIZE_TYPE_DISCRETE:
1633                 do
1634                 {
1635                     frmsize.index++;
1636                     float f_fps = GetMaxFrameRate( p_demux, i_fd,
1637                                                    i_pixel_format,
1638                                                    frmsize.discrete.width,
1639                                                    frmsize.discrete.height );
1640                     if( f_fps >= f_fps_min &&
1641                         frmsize.discrete.width > *pi_width )
1642                     {
1643                         *pi_width = frmsize.discrete.width;
1644                         *pi_height = frmsize.discrete.height;
1645                     }
1646                 } while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES,
1647                          &frmsize ) >= 0 );
1648                 break;
1649             case V4L2_FRMSIZE_TYPE_STEPWISE:
1650             {
1651                 uint32_t i_width = frmsize.stepwise.min_width;
1652                 uint32_t i_height = frmsize.stepwise.min_height;
1653                 for( ;
1654                      i_width <= frmsize.stepwise.max_width &&
1655                      i_height <= frmsize.stepwise.max_width;
1656                      i_width += frmsize.stepwise.step_width,
1657                      i_height += frmsize.stepwise.step_height )
1658                 {
1659                     float f_fps = GetMaxFrameRate( p_demux, i_fd,
1660                                                    i_pixel_format,
1661                                                    i_width, i_height );
1662                     if( f_fps >= f_fps_min && i_width > *pi_width )
1663                     {
1664                         *pi_width = i_width;
1665                         *pi_height = i_height;
1666                     }
1667                 }
1668                 break;
1669             }
1670             case V4L2_FRMSIZE_TYPE_CONTINUOUS:
1671                 /* FIXME */
1672                 msg_Err( p_demux, "GetMaxDimension implementation for V4L2_FRMSIZE_TYPE_CONTINUOUS isn't correct" );
1673                 float f_fps = GetMaxFrameRate( p_demux, i_fd,
1674                                                i_pixel_format,
1675                                                frmsize.stepwise.max_width,
1676                                                frmsize.stepwise.max_height );
1677                 if( f_fps >= f_fps_min &&
1678                     frmsize.stepwise.max_width > *pi_width )
1679                 {
1680                     *pi_width = frmsize.stepwise.max_width;
1681                     *pi_height = frmsize.stepwise.max_height;
1682                 }
1683                 break;
1684         }
1685     }
1686 #endif
1687 }
1688
1689 /*****************************************************************************
1690  * OpenVideoDev: open and set up the video device and probe for capabilities
1691  *****************************************************************************/
1692 static int OpenVideoDev( vlc_object_t *p_obj, demux_sys_t *p_sys, bool b_demux )
1693 {
1694     int i_fd;
1695     struct v4l2_cropcap cropcap;
1696     struct v4l2_crop crop;
1697     struct v4l2_format fmt;
1698     unsigned int i_min;
1699     enum v4l2_buf_type buf_type;
1700     const char *psz_device = p_sys->psz_device;
1701     es_format_t es_fmt;
1702
1703     if( ( i_fd = open( psz_device, O_RDWR ) ) < 0 )
1704     {
1705         msg_Err( p_obj, "cannot open device (%m)" );
1706         goto open_failed;
1707     }
1708
1709 #ifdef HAVE_LIBV4L2
1710     /* Note the v4l2_xxx functions are designed so that if they get passed an
1711        unknown fd, the will behave exactly as their regular xxx counterparts,
1712        so if v4l2_fd_open fails, we continue as normal (missing the libv4l2
1713        custom cam format to normal formats conversion). Chances are big we will
1714        still fail then though, as normally v4l2_fd_open only fails if the
1715        device is not a v4l2 device. */
1716     if( p_sys->b_libv4l2 )
1717     {
1718         int libv4l2_fd;
1719         libv4l2_fd = v4l2_fd_open( i_fd, V4L2_ENABLE_ENUM_FMT_EMULATION );
1720         if( libv4l2_fd != -1 )
1721             i_fd = libv4l2_fd;
1722     }
1723 #endif
1724
1725     /* Tune the tuner */
1726     if( p_sys->i_frequency >= 0 )
1727     {
1728         if( p_sys->i_cur_tuner < 0 || p_sys->i_cur_tuner >= p_sys->i_tuner )
1729         {
1730             msg_Err( p_obj, "invalid tuner %d.", p_sys->i_cur_tuner );
1731             goto open_failed;
1732         }
1733         struct v4l2_frequency frequency;
1734         memset( &frequency, 0, sizeof( frequency ) );
1735         frequency.tuner = p_sys->i_cur_tuner;
1736         frequency.type = p_sys->p_tuners[p_sys->i_cur_tuner].type;
1737         frequency.frequency = p_sys->i_frequency / 62.5;
1738         if( v4l2_ioctl( i_fd, VIDIOC_S_FREQUENCY, &frequency ) < 0 )
1739         {
1740             msg_Err( p_obj, "cannot set tuner frequency (%m)" );
1741             goto open_failed;
1742         }
1743         msg_Dbg( p_obj, "Tuner frequency set" );
1744     }
1745
1746     /* Set the tuner's audio mode */
1747     if( p_sys->i_audio_mode >= 0 )
1748     {
1749         if( p_sys->i_cur_tuner < 0 || p_sys->i_cur_tuner >= p_sys->i_tuner )
1750         {
1751             msg_Err( p_obj, "invalid tuner %d.", p_sys->i_cur_tuner );
1752             goto open_failed;
1753         }
1754         struct v4l2_tuner tuner;
1755         memset( &tuner, 0, sizeof( tuner ) );
1756         tuner.index = p_sys->i_cur_tuner;
1757         tuner.audmode = p_sys->i_audio_mode;
1758         if( v4l2_ioctl( i_fd, VIDIOC_S_TUNER, &tuner ) < 0 )
1759         {
1760             msg_Err( p_obj, "cannot set tuner audio mode (%m)" );
1761             goto open_failed;
1762         }
1763         msg_Dbg( p_obj, "Tuner audio mode set" );
1764     }
1765
1766     /* Select standard */
1767
1768     if( p_sys->i_selected_standard_id != V4L2_STD_UNKNOWN )
1769     {
1770         if( v4l2_ioctl( i_fd, VIDIOC_S_STD, &p_sys->i_selected_standard_id ) < 0 )
1771         {
1772             msg_Err( p_obj, "cannot set standard (%m)" );
1773             goto open_failed;
1774         }
1775         msg_Dbg( p_obj, "Set standard" );
1776     }
1777
1778     /* Select input */
1779
1780     if( p_sys->i_selected_input >= p_sys->i_input )
1781     {
1782         msg_Warn( p_obj, "invalid input. Using the default one" );
1783         p_sys->i_selected_input = 0;
1784     }
1785
1786     if( v4l2_ioctl( i_fd, VIDIOC_S_INPUT, &p_sys->i_selected_input ) < 0 )
1787     {
1788         msg_Err( p_obj, "cannot set input (%m)" );
1789         goto open_failed;
1790     }
1791
1792     /* Set audio input */
1793
1794     if( p_sys->i_audio > 0 )
1795     {
1796         if( p_sys->i_selected_audio_input < 0
1797          || p_sys->i_selected_audio_input >= p_sys->i_audio )
1798         {
1799             msg_Warn( p_obj, "invalid audio input. Using the default one" );
1800             p_sys->i_selected_audio_input = 0;
1801         }
1802
1803         if( v4l2_ioctl( i_fd, VIDIOC_S_AUDIO, &p_sys->p_audios[p_sys->i_selected_audio_input] ) < 0 )
1804         {
1805             msg_Err( p_obj, "cannot set audio input (%m)" );
1806             goto open_failed;
1807         }
1808         msg_Dbg( p_obj, "Audio input set to %d", p_sys->i_selected_audio_input );
1809     }
1810
1811
1812     /* TODO: Move the resolution stuff up here */
1813     /* if MPEG encoder card, no need to do anything else after this */
1814     ControlList( p_obj, p_sys, i_fd,
1815                   var_GetBool( p_obj, "v4l2-controls-reset" ), b_demux );
1816     SetAvailControlsByString( p_obj, p_sys, i_fd );
1817
1818     /* Verify device support for the various IO methods */
1819     switch( p_sys->io )
1820     {
1821         case IO_METHOD_READ:
1822             if( !(p_sys->dev_cap.capabilities & V4L2_CAP_READWRITE) )
1823             {
1824                 msg_Err( p_obj, "device does not support read i/o" );
1825                 goto open_failed;
1826             }
1827             break;
1828
1829         case IO_METHOD_MMAP:
1830         case IO_METHOD_USERPTR:
1831             if( !(p_sys->dev_cap.capabilities & V4L2_CAP_STREAMING) )
1832             {
1833                 msg_Err( p_obj, "device does not support streaming i/o" );
1834                 goto open_failed;
1835             }
1836             break;
1837
1838         default:
1839             msg_Err( p_obj, "io method not supported" );
1840             goto open_failed;
1841     }
1842
1843     /* Reset Cropping */
1844     memset( &cropcap, 0, sizeof(cropcap) );
1845     cropcap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1846     if( v4l2_ioctl( i_fd, VIDIOC_CROPCAP, &cropcap ) >= 0 )
1847     {
1848         crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1849         crop.c = cropcap.defrect; /* reset to default */
1850         if( v4l2_ioctl( i_fd, VIDIOC_S_CROP, &crop ) < 0 )
1851         {
1852             switch( errno )
1853             {
1854                 case EINVAL:
1855                     /* Cropping not supported. */
1856                     break;
1857                 default:
1858                     /* Errors ignored. */
1859                     break;
1860             }
1861         }
1862     }
1863
1864     /* Try and find default resolution if not specified */
1865     memset( &fmt, 0, sizeof(fmt) );
1866     fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1867
1868     if( p_sys->i_width == 0 || p_sys->i_height == 0 )
1869     {
1870         /* Use current width and height settings */
1871         if( v4l2_ioctl( i_fd, VIDIOC_G_FMT, &fmt ) < 0 )
1872         {
1873             msg_Err( p_obj, "Cannot get default width and height." );
1874             goto open_failed;
1875         }
1876
1877         p_sys->i_width = fmt.fmt.pix.width;
1878         p_sys->i_height = fmt.fmt.pix.height;
1879
1880         if( fmt.fmt.pix.field == V4L2_FIELD_ALTERNATE )
1881         {
1882             p_sys->i_height = p_sys->i_height * 2;
1883         }
1884     }
1885     else if( p_sys->i_width < 0 || p_sys->i_height < 0 )
1886     {
1887         msg_Dbg( p_obj, "will try to find optimal width and height." );
1888     }
1889     else
1890     {
1891         /* Use user specified width and height */
1892         msg_Dbg( p_obj, "trying specified size %dx%d", p_sys->i_width, p_sys->i_height );
1893     }
1894
1895     fmt.fmt.pix.width = p_sys->i_width;
1896     fmt.fmt.pix.height = p_sys->i_height;
1897     fmt.fmt.pix.field = V4L2_FIELD_NONE;
1898
1899     if (b_demux)
1900     {
1901         demux_t *p_demux = (demux_t *) p_obj;
1902
1903         /* Test and set Chroma */
1904         fmt.fmt.pix.pixelformat = 0;
1905         if( p_sys->psz_requested_chroma && *p_sys->psz_requested_chroma )
1906         {
1907             /* User specified chroma */
1908             const vlc_fourcc_t i_requested_fourcc =
1909                 vlc_fourcc_GetCodecFromString( VIDEO_ES, p_sys->psz_requested_chroma );
1910
1911             for( int i = 0; v4l2chroma_to_fourcc[i].i_v4l2 != 0; i++ )
1912             {
1913                 if( v4l2chroma_to_fourcc[i].i_fourcc == i_requested_fourcc )
1914                 {
1915                     fmt.fmt.pix.pixelformat = v4l2chroma_to_fourcc[i].i_v4l2;
1916                     break;
1917                 }
1918             }
1919             /* Try and set user chroma */
1920             if( !IsPixelFormatSupported( p_demux, fmt.fmt.pix.pixelformat ) || ( fmt.fmt.pix.pixelformat && v4l2_ioctl( i_fd, VIDIOC_S_FMT, &fmt ) < 0 ) )
1921             {
1922                 msg_Warn( p_demux, "Driver is unable to use specified chroma %s. Trying defaults.", p_sys->psz_requested_chroma );
1923                 fmt.fmt.pix.pixelformat = 0;
1924             }
1925         }
1926
1927         /* If no user specified chroma, find best */
1928         /* This also decides if MPEG encoder card or not */
1929         if( !fmt.fmt.pix.pixelformat )
1930         {
1931             unsigned int i;
1932             for( i = 0; i < ARRAY_SIZE( p_chroma_fallbacks ); i++ )
1933             {
1934                 fmt.fmt.pix.pixelformat = p_chroma_fallbacks[i];
1935                 if( IsPixelFormatSupported( p_demux, fmt.fmt.pix.pixelformat )
1936                  && v4l2_ioctl( i_fd, VIDIOC_S_FMT, &fmt ) >= 0 )
1937                     break;
1938             }
1939             if( i == ARRAY_SIZE( p_chroma_fallbacks ) )
1940             {
1941                 msg_Warn( p_demux, "Could not select any of the default chromas; attempting to open as MPEG encoder card (access)" );
1942                 goto open_failed;
1943             }
1944         }
1945
1946         if( p_sys->i_width < 0 || p_sys->i_height < 0 )
1947         {
1948             if( p_sys->f_fps <= 0 )
1949             {
1950                 p_sys->f_fps = GetAbsoluteMaxFrameRate( p_demux, i_fd,
1951                                                         fmt.fmt.pix.pixelformat );
1952                 msg_Dbg( p_demux, "Found maximum framerate of %f", p_sys->f_fps );
1953             }
1954             GetMaxDimensions( p_demux, i_fd,
1955                               fmt.fmt.pix.pixelformat, p_sys->f_fps,
1956                               &fmt.fmt.pix.width, &fmt.fmt.pix.height );
1957             msg_Dbg( p_demux, "Found optimal dimensions for framerate %f of %dx%d",
1958                      p_sys->f_fps, fmt.fmt.pix.width, fmt.fmt.pix.height );
1959             if( v4l2_ioctl( i_fd, VIDIOC_S_FMT, &fmt ) < 0 ) {;}
1960         }
1961
1962         /* Reassign width, height and chroma incase driver override */
1963         p_sys->i_width = fmt.fmt.pix.width;
1964         p_sys->i_height = fmt.fmt.pix.height;
1965     }
1966
1967     if( v4l2_ioctl( i_fd, VIDIOC_G_FMT, &fmt ) < 0 ) {;}
1968     /* Print extra info */
1969     msg_Dbg( p_obj, "Driver requires at most %d bytes to store a complete image", fmt.fmt.pix.sizeimage );
1970     /* Check interlacing */
1971     switch( fmt.fmt.pix.field )
1972     {
1973         case V4L2_FIELD_NONE:
1974             msg_Dbg( p_obj, "Interlacing setting: progressive" );
1975             break;
1976         case V4L2_FIELD_TOP:
1977             msg_Dbg( p_obj, "Interlacing setting: top field only" );
1978             break;
1979         case V4L2_FIELD_BOTTOM:
1980             msg_Dbg( p_obj, "Interlacing setting: bottom field only" );
1981             break;
1982         case V4L2_FIELD_INTERLACED:
1983             msg_Dbg( p_obj, "Interlacing setting: interleaved (bottom top if M/NTSC, top bottom otherwise)" );
1984             break;
1985         case V4L2_FIELD_SEQ_TB:
1986             msg_Dbg( p_obj, "Interlacing setting: sequential top bottom" );
1987             break;
1988         case V4L2_FIELD_SEQ_BT:
1989             msg_Dbg( p_obj, "Interlacing setting: sequential bottom top" );
1990             break;
1991         case V4L2_FIELD_ALTERNATE:
1992             msg_Dbg( p_obj, "Interlacing setting: alternate fields" );
1993             break;
1994         case V4L2_FIELD_INTERLACED_TB:
1995             msg_Dbg( p_obj, "Interlacing setting: interleaved top bottom" );
1996             break;
1997         case V4L2_FIELD_INTERLACED_BT:
1998             msg_Dbg( p_obj, "Interlacing setting: interleaved bottom top" );
1999             break;
2000         default:
2001             msg_Warn( p_obj, "Interlacing setting: unknown type (%d)",
2002                       fmt.fmt.pix.field );
2003             break;
2004     }
2005     if( fmt.fmt.pix.field != V4L2_FIELD_NONE )
2006         msg_Warn( p_obj, "Interlaced inputs haven't been tested. Please report any issue." );
2007
2008     /* Look up final fourcc */
2009     p_sys->i_fourcc = 0;
2010     for( int i = 0; v4l2chroma_to_fourcc[i].i_fourcc != 0; i++ )
2011     {
2012         if( v4l2chroma_to_fourcc[i].i_v4l2 == fmt.fmt.pix.pixelformat )
2013         {
2014             p_sys->i_fourcc = v4l2chroma_to_fourcc[i].i_fourcc;
2015             es_format_Init( &es_fmt, VIDEO_ES, p_sys->i_fourcc );
2016             es_fmt.video.i_rmask = v4l2chroma_to_fourcc[i].i_rmask;
2017             es_fmt.video.i_gmask = v4l2chroma_to_fourcc[i].i_gmask;
2018             es_fmt.video.i_bmask = v4l2chroma_to_fourcc[i].i_bmask;
2019             break;
2020         }
2021     }
2022
2023     /* Buggy driver paranoia */
2024     i_min = fmt.fmt.pix.width * 2;
2025     if( fmt.fmt.pix.bytesperline < i_min )
2026         fmt.fmt.pix.bytesperline = i_min;
2027     i_min = fmt.fmt.pix.bytesperline * fmt.fmt.pix.height;
2028     if( fmt.fmt.pix.sizeimage < i_min )
2029         fmt.fmt.pix.sizeimage = i_min;
2030
2031 #ifdef VIDIOC_ENUM_FRAMEINTERVALS
2032     /* This is new in Linux 2.6.19 */
2033     /* List supported frame rates */
2034     struct v4l2_frmivalenum frmival;
2035     memset( &frmival, 0, sizeof(frmival) );
2036     frmival.pixel_format = fmt.fmt.pix.pixelformat;
2037     frmival.width = p_sys->i_width;
2038     frmival.height = p_sys->i_height;
2039     if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMEINTERVALS, &frmival ) >= 0 )
2040     {
2041         char psz_fourcc[5];
2042         memset( &psz_fourcc, 0, sizeof( psz_fourcc ) );
2043         vlc_fourcc_to_char( p_sys->i_fourcc, &psz_fourcc );
2044         msg_Dbg( p_obj, "supported frame intervals for %4s, %dx%d:",
2045                  psz_fourcc, frmival.width, frmival.height );
2046         switch( frmival.type )
2047         {
2048             case V4L2_FRMIVAL_TYPE_DISCRETE:
2049                 do
2050                 {
2051                     msg_Dbg( p_obj, "    supported frame interval: %d/%d",
2052                              frmival.discrete.numerator,
2053                              frmival.discrete.denominator );
2054                     frmival.index++;
2055                 } while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMEINTERVALS, &frmival ) >= 0 );
2056                 break;
2057             case V4L2_FRMIVAL_TYPE_STEPWISE:
2058                 msg_Dbg( p_obj, "    supported frame intervals: %d/%d to "
2059                          "%d/%d using %d/%d increments",
2060                          frmival.stepwise.min.numerator,
2061                          frmival.stepwise.min.denominator,
2062                          frmival.stepwise.max.numerator,
2063                          frmival.stepwise.max.denominator,
2064                          frmival.stepwise.step.numerator,
2065                          frmival.stepwise.step.denominator );
2066                 break;
2067             case V4L2_FRMIVAL_TYPE_CONTINUOUS:
2068                 msg_Dbg( p_obj, "    supported frame intervals: %d/%d to %d/%d",
2069                          frmival.stepwise.min.numerator,
2070                          frmival.stepwise.min.denominator,
2071                          frmival.stepwise.max.numerator,
2072                          frmival.stepwise.max.denominator );
2073                 break;
2074         }
2075     }
2076 #endif
2077
2078
2079     /* Init IO method */
2080     switch( p_sys->io )
2081     {
2082     case IO_METHOD_READ:
2083         if( InitRead( p_obj, p_sys, fmt.fmt.pix.sizeimage ) != VLC_SUCCESS ) goto open_failed;
2084         break;
2085
2086     case IO_METHOD_MMAP:
2087         if( InitMmap( p_obj, p_sys, i_fd ) != VLC_SUCCESS ) goto open_failed;
2088         break;
2089
2090     case IO_METHOD_USERPTR:
2091         if( InitUserP( p_obj, p_sys, i_fd, fmt.fmt.pix.sizeimage ) != VLC_SUCCESS ) goto open_failed;
2092         break;
2093
2094     }
2095
2096     /* Add */
2097     es_fmt.video.i_width  = p_sys->i_width;
2098     es_fmt.video.i_height = p_sys->i_height;
2099     es_fmt.video.i_aspect = 4 * VOUT_ASPECT_FACTOR / 3;
2100
2101     if( b_demux )
2102     {
2103         demux_t *p_demux = (demux_t *) p_obj;
2104         msg_Dbg( p_demux, "added new video es %4.4s %dx%d",
2105             (char*)&es_fmt.i_codec, es_fmt.video.i_width, es_fmt.video.i_height );
2106         p_sys->p_es = es_out_Add( p_demux->out, &es_fmt );
2107     }
2108
2109     /* Start Capture */
2110
2111     switch( p_sys->io )
2112     {
2113     case IO_METHOD_READ:
2114         /* Nothing to do */
2115         break;
2116
2117     case IO_METHOD_MMAP:
2118         for (unsigned int i = 0; i < p_sys->i_nbuffers; ++i)
2119         {
2120             struct v4l2_buffer buf;
2121
2122             memset( &buf, 0, sizeof(buf) );
2123             buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2124             buf.memory = V4L2_MEMORY_MMAP;
2125             buf.index = i;
2126
2127             if( v4l2_ioctl( i_fd, VIDIOC_QBUF, &buf ) < 0 )
2128             {
2129                 msg_Err( p_obj, "VIDIOC_QBUF failed" );
2130                 goto open_failed;
2131             }
2132         }
2133
2134         buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2135         if( v4l2_ioctl( i_fd, VIDIOC_STREAMON, &buf_type ) < 0 )
2136         {
2137             msg_Err( p_obj, "VIDIOC_STREAMON failed" );
2138             goto open_failed;
2139         }
2140
2141         break;
2142
2143     case IO_METHOD_USERPTR:
2144         for( unsigned int i = 0; i < p_sys->i_nbuffers; ++i )
2145         {
2146             struct v4l2_buffer buf;
2147
2148             memset( &buf, 0, sizeof(buf) );
2149             buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2150             buf.memory = V4L2_MEMORY_USERPTR;
2151             buf.index = i;
2152             buf.m.userptr = (unsigned long)p_sys->p_buffers[i].start;
2153             buf.length = p_sys->p_buffers[i].length;
2154
2155             if( v4l2_ioctl( i_fd, VIDIOC_QBUF, &buf ) < 0 )
2156             {
2157                 msg_Err( p_obj, "VIDIOC_QBUF failed" );
2158                 goto open_failed;
2159             }
2160         }
2161
2162         buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2163         if( v4l2_ioctl( i_fd, VIDIOC_STREAMON, &buf_type ) < 0 )
2164         {
2165             msg_Err( p_obj, "VIDIOC_STREAMON failed" );
2166             goto open_failed;
2167         }
2168
2169         break;
2170     }
2171
2172     /* report fps */
2173     if( p_sys->f_fps >= 0.1 )
2174     {
2175         msg_Dbg( p_obj, "User set fps=%f", p_sys->f_fps );
2176     }
2177
2178     return i_fd;
2179
2180 open_failed:
2181     if( i_fd >= 0 ) v4l2_close( i_fd );
2182     return -1;
2183
2184 }
2185
2186 /*****************************************************************************
2187  * ProbeVideoDev: probe video for capabilities
2188  *****************************************************************************/
2189 static bool ProbeVideoDev( vlc_object_t *p_obj, demux_sys_t *p_sys,
2190                                  const char *psz_device )
2191 {
2192     int i_index;
2193     int i_standard;
2194
2195     int i_fd;
2196
2197     if( ( i_fd = open( psz_device, O_RDWR ) ) < 0 )
2198     {
2199         msg_Err( p_obj, "cannot open video device '%s' (%m)", psz_device );
2200         goto open_failed;
2201     }
2202
2203 #ifdef HAVE_LIBV4L2
2204     /* Note the v4l2_xxx functions are designed so that if they get passed an
2205        unknown fd, the will behave exactly as their regular xxx counterparts,
2206        so if v4l2_fd_open fails, we continue as normal (missing the libv4l2
2207        custom cam format to normal formats conversion). Chances are big we will
2208        still fail then though, as normally v4l2_fd_open only fails if the
2209        device is not a v4l2 device. */
2210     if( p_sys->b_libv4l2 )
2211     {
2212         int libv4l2_fd;
2213         libv4l2_fd = v4l2_fd_open( i_fd, V4L2_ENABLE_ENUM_FMT_EMULATION );
2214         if( libv4l2_fd != -1 )
2215             i_fd = libv4l2_fd;
2216     }
2217 #endif
2218
2219     /* Get device capabilites */
2220
2221     if( v4l2_ioctl( i_fd, VIDIOC_QUERYCAP, &p_sys->dev_cap ) < 0 )
2222     {
2223         msg_Err( p_obj, "cannot get video capabilities (%m)" );
2224         goto open_failed;
2225     }
2226
2227     msg_Dbg( p_obj, "V4L2 device: %s using driver: %s (version: %u.%u.%u) on %s",
2228                             p_sys->dev_cap.card,
2229                             p_sys->dev_cap.driver,
2230                             (p_sys->dev_cap.version >> 16) & 0xFF,
2231                             (p_sys->dev_cap.version >> 8) & 0xFF,
2232                             p_sys->dev_cap.version & 0xFF,
2233                             p_sys->dev_cap.bus_info );
2234
2235     msg_Dbg( p_obj, "the device has the capabilities: (%c) Video Capure, "
2236                                                        "(%c) Audio, "
2237                                                        "(%c) Tuner",
2238              ( p_sys->dev_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE  ? 'X':' '),
2239              ( p_sys->dev_cap.capabilities & V4L2_CAP_AUDIO  ? 'X':' '),
2240              ( p_sys->dev_cap.capabilities & V4L2_CAP_TUNER  ? 'X':' ') );
2241
2242     msg_Dbg( p_obj, "supported I/O methods are: (%c) Read/Write, "
2243                                                  "(%c) Streaming, "
2244                                                  "(%c) Asynchronous",
2245             ( p_sys->dev_cap.capabilities & V4L2_CAP_READWRITE ? 'X':' ' ),
2246             ( p_sys->dev_cap.capabilities & V4L2_CAP_STREAMING ? 'X':' ' ),
2247             ( p_sys->dev_cap.capabilities & V4L2_CAP_ASYNCIO ? 'X':' ' ) );
2248
2249     /* Now, enumerate all the video inputs. This is useless at the moment
2250        since we have no way to present that info to the user except with
2251        debug messages */
2252
2253     if( p_sys->dev_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE )
2254     {
2255         struct v4l2_input t_input;
2256         memset( &t_input, 0, sizeof(t_input) );
2257         while( v4l2_ioctl( i_fd, VIDIOC_ENUMINPUT, &t_input ) >= 0 )
2258         {
2259             p_sys->i_input++;
2260             t_input.index = p_sys->i_input;
2261         }
2262
2263         p_sys->p_inputs = calloc( 1, p_sys->i_input * sizeof( struct v4l2_input ) );
2264         if( !p_sys->p_inputs ) goto open_failed;
2265
2266         for( i_index = 0; i_index < p_sys->i_input; i_index++ )
2267         {
2268             p_sys->p_inputs[i_index].index = i_index;
2269
2270             if( v4l2_ioctl( i_fd, VIDIOC_ENUMINPUT, &p_sys->p_inputs[i_index] ) )
2271             {
2272                 msg_Err( p_obj, "cannot get video input characteristics (%m)" );
2273                 goto open_failed;
2274             }
2275             msg_Dbg( p_obj, "video input %i (%s) has type: %s %c",
2276                                 i_index,
2277                                 p_sys->p_inputs[i_index].name,
2278                                 p_sys->p_inputs[i_index].type
2279                                         == V4L2_INPUT_TYPE_TUNER ?
2280                                         "Tuner adapter" :
2281                                         "External analog input",
2282                                 i_index == p_sys->i_selected_input ? '*' : ' ' );
2283         }
2284     }
2285
2286     /* Probe video standards */
2287     if( p_sys->dev_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE )
2288     {
2289         struct v4l2_standard t_standards;
2290         t_standards.index = 0;
2291         p_sys->i_standard = 0;
2292         while( v4l2_ioctl( i_fd, VIDIOC_ENUMSTD, &t_standards ) >=0 )
2293         {
2294             p_sys->i_standard++;
2295             t_standards.index = p_sys->i_standard;
2296         }
2297
2298         p_sys->p_standards = calloc( 1, p_sys->i_standard * sizeof( struct v4l2_standard ) );
2299         if( !p_sys->p_standards ) goto open_failed;
2300
2301         for( i_standard = 0; i_standard < p_sys->i_standard; i_standard++ )
2302         {
2303             p_sys->p_standards[i_standard].index = i_standard;
2304
2305             if( v4l2_ioctl( i_fd, VIDIOC_ENUMSTD, &p_sys->p_standards[i_standard] ) )
2306             {
2307                 msg_Err( p_obj, "cannot get video input standards (%m)" );
2308                 goto open_failed;
2309             }
2310             msg_Dbg( p_obj, "video standard %i is: %s %c",
2311                                 i_standard,
2312                                 p_sys->p_standards[i_standard].name,
2313                                 (unsigned)i_standard == p_sys->i_selected_standard_id ? '*' : ' ' );
2314         }
2315     }
2316
2317     /* initialize the structures for the ioctls */
2318     for( i_index = 0; i_index < 32; i_index++ )
2319     {
2320         p_sys->p_audios[i_index].index = i_index;
2321     }
2322
2323     /* Probe audio inputs */
2324     if( p_sys->dev_cap.capabilities & V4L2_CAP_AUDIO )
2325     {
2326         while( p_sys->i_audio < 32 &&
2327                v4l2_ioctl( i_fd, VIDIOC_S_AUDIO, &p_sys->p_audios[p_sys->i_audio] ) >= 0 )
2328         {
2329             if( v4l2_ioctl( i_fd, VIDIOC_G_AUDIO, &p_sys->p_audios[ p_sys->i_audio] ) < 0 )
2330             {
2331                 msg_Err( p_obj, "cannot get audio input characteristics (%m)" );
2332                 goto open_failed;
2333             }
2334
2335             msg_Dbg( p_obj, "audio input %i (%s) is %s %s %c",
2336                                 p_sys->i_audio,
2337                                 p_sys->p_audios[p_sys->i_audio].name,
2338                                 p_sys->p_audios[p_sys->i_audio].capability &
2339                                                     V4L2_AUDCAP_STEREO ?
2340                                         "Stereo" : "Mono",
2341                                 p_sys->p_audios[p_sys->i_audio].capability &
2342                                                     V4L2_AUDCAP_AVL ?
2343                                     "(Automatic Volume Level supported)" : "",
2344                                 p_sys->i_audio == p_sys->i_selected_audio_input ? '*' : ' ' );
2345
2346             p_sys->i_audio++;
2347         }
2348     }
2349
2350     /* List tuner caps */
2351     if( p_sys->dev_cap.capabilities & V4L2_CAP_TUNER )
2352     {
2353         struct v4l2_tuner tuner;
2354         memset( &tuner, 0, sizeof(tuner) );
2355         p_sys->i_tuner = 0;
2356         while( v4l2_ioctl( i_fd, VIDIOC_G_TUNER, &tuner ) >= 0 )
2357         {
2358             p_sys->i_tuner++;
2359             memset( &tuner, 0, sizeof(tuner) );
2360             tuner.index = p_sys->i_tuner;
2361         }
2362
2363         p_sys->p_tuners = calloc( 1, p_sys->i_tuner * sizeof( struct v4l2_tuner ) );
2364         if( !p_sys->p_tuners ) goto open_failed;
2365
2366         for( i_index = 0; i_index < p_sys->i_tuner; i_index++ )
2367         {
2368             p_sys->p_tuners[i_index].index = i_index;
2369
2370             if( v4l2_ioctl( i_fd, VIDIOC_G_TUNER, &p_sys->p_tuners[i_index] ) )
2371             {
2372                 msg_Err( p_obj, "cannot get tuner characteristics (%m)" );
2373                 goto open_failed;
2374             }
2375             msg_Dbg( p_obj, "tuner %i (%s) has type: %s, "
2376                               "frequency range: %.1f %s -> %.1f %s",
2377                                 i_index,
2378                                 p_sys->p_tuners[i_index].name,
2379                                 p_sys->p_tuners[i_index].type
2380                                         == V4L2_TUNER_RADIO ?
2381                                         "Radio" : "Analog TV",
2382                                 p_sys->p_tuners[i_index].rangelow * 62.5,
2383                                 p_sys->p_tuners[i_index].capability &
2384                                         V4L2_TUNER_CAP_LOW ?
2385                                         "Hz" : "kHz",
2386                                 p_sys->p_tuners[i_index].rangehigh * 62.5,
2387                                 p_sys->p_tuners[i_index].capability &
2388                                         V4L2_TUNER_CAP_LOW ?
2389                                         "Hz" : "kHz" );
2390
2391             struct v4l2_frequency frequency;
2392             memset( &frequency, 0, sizeof( frequency ) );
2393             if( v4l2_ioctl( i_fd, VIDIOC_G_FREQUENCY, &frequency ) < 0 )
2394             {
2395                 msg_Err( p_obj, "cannot get tuner frequency (%m)" );
2396                 goto open_failed;
2397             }
2398             msg_Dbg( p_obj, "tuner %i (%s) frequency: %.1f %s",
2399                      i_index,
2400                      p_sys->p_tuners[i_index].name,
2401                      frequency.frequency * 62.5,
2402                      p_sys->p_tuners[i_index].capability &
2403                              V4L2_TUNER_CAP_LOW ?
2404                              "Hz" : "kHz" );
2405         }
2406     }
2407
2408     /* Probe for available chromas */
2409     if( p_sys->dev_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE )
2410     {
2411         struct v4l2_fmtdesc codec;
2412
2413         i_index = 0;
2414         memset( &codec, 0, sizeof(codec) );
2415         codec.index = i_index;
2416         codec.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2417
2418         while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FMT, &codec ) >= 0 )
2419         {
2420             i_index++;
2421             codec.index = i_index;
2422         }
2423
2424         p_sys->i_codec = i_index;
2425
2426         p_sys->p_codecs = calloc( 1, p_sys->i_codec * sizeof( struct v4l2_fmtdesc ) );
2427
2428         for( i_index = 0; i_index < p_sys->i_codec; i_index++ )
2429         {
2430             p_sys->p_codecs[i_index].index = i_index;
2431             p_sys->p_codecs[i_index].type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2432
2433             if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FMT, &p_sys->p_codecs[i_index] ) < 0 )
2434             {
2435                 msg_Err( p_obj, "cannot get codec description (%m)" );
2436                 goto open_failed;
2437             }
2438
2439             /* only print if vlc supports the format */
2440             char psz_fourcc_v4l2[5];
2441             memset( &psz_fourcc_v4l2, 0, sizeof( psz_fourcc_v4l2 ) );
2442             vlc_fourcc_to_char( p_sys->p_codecs[i_index].pixelformat,
2443                                 &psz_fourcc_v4l2 );
2444             bool b_codec_supported = false;
2445             for( int i = 0; v4l2chroma_to_fourcc[i].i_v4l2 != 0; i++ )
2446             {
2447                 if( v4l2chroma_to_fourcc[i].i_v4l2 == p_sys->p_codecs[i_index].pixelformat )
2448                 {
2449                     b_codec_supported = true;
2450
2451                     char psz_fourcc[5];
2452                     memset( &psz_fourcc, 0, sizeof( psz_fourcc ) );
2453                     vlc_fourcc_to_char( v4l2chroma_to_fourcc[i].i_fourcc,
2454                                         &psz_fourcc );
2455                     msg_Dbg( p_obj, "device supports chroma %4s [%s, %s]",
2456                                 psz_fourcc,
2457                                 p_sys->p_codecs[i_index].description,
2458                                 psz_fourcc_v4l2 );
2459
2460 #ifdef VIDIOC_ENUM_FRAMESIZES
2461                     /* This is new in Linux 2.6.19 */
2462                     /* List valid frame sizes for this format */
2463                     struct v4l2_frmsizeenum frmsize;
2464                     memset( &frmsize, 0, sizeof(frmsize) );
2465                     frmsize.pixel_format = p_sys->p_codecs[i_index].pixelformat;
2466                     if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES, &frmsize ) < 0 )
2467                     {
2468                         /* Not all devices support this ioctl */
2469                         msg_Warn( p_obj, "Unable to query for frame sizes" );
2470                     }
2471                     else
2472                     {
2473                         switch( frmsize.type )
2474                         {
2475                             case V4L2_FRMSIZE_TYPE_DISCRETE:
2476                                 do
2477                                 {
2478                                     msg_Dbg( p_obj,
2479                 "    device supports size %dx%d",
2480                 frmsize.discrete.width, frmsize.discrete.height );
2481                                     frmsize.index++;
2482                                 } while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES, &frmsize ) >= 0 );
2483                                 break;
2484                             case V4L2_FRMSIZE_TYPE_STEPWISE:
2485                                 msg_Dbg( p_obj,
2486                 "    device supports sizes %dx%d to %dx%d using %dx%d increments",
2487                 frmsize.stepwise.min_width, frmsize.stepwise.min_height,
2488                 frmsize.stepwise.max_width, frmsize.stepwise.max_height,
2489                 frmsize.stepwise.step_width, frmsize.stepwise.step_height );
2490                                 break;
2491                             case V4L2_FRMSIZE_TYPE_CONTINUOUS:
2492                                 msg_Dbg( p_obj,
2493                 "    device supports all sizes %dx%d to %dx%d",
2494                 frmsize.stepwise.min_width, frmsize.stepwise.min_height,
2495                 frmsize.stepwise.max_width, frmsize.stepwise.max_height );
2496                                 break;
2497                         }
2498                     }
2499 #endif
2500                 }
2501             }
2502             if( !b_codec_supported )
2503             {
2504                     msg_Dbg( p_obj,
2505                          "device codec %4s (%s) not supported",
2506                          psz_fourcc_v4l2,
2507                          p_sys->p_codecs[i_index].description );
2508             }
2509         }
2510     }
2511
2512
2513     if( i_fd >= 0 ) v4l2_close( i_fd );
2514     return true;
2515
2516 open_failed:
2517
2518     if( i_fd >= 0 ) v4l2_close( i_fd );
2519     return false;
2520
2521 }
2522
2523 static void name2var( unsigned char *name )
2524 {
2525     for( ; *name; name++ )
2526         *name = (*name == ' ') ? '_' : tolower( *name );
2527 }
2528
2529 /*****************************************************************************
2530  * Print a user-class v4l2 control's details, create the relevant variable,
2531  * change the value if needed.
2532  *****************************************************************************/
2533 static void ControlListPrint( vlc_object_t *p_obj, demux_sys_t *p_sys, int i_fd,
2534                               struct v4l2_queryctrl queryctrl,
2535                               bool b_reset, bool b_demux )
2536 {
2537     struct v4l2_querymenu querymenu;
2538     unsigned int i_mid;
2539
2540     int i;
2541     int i_val;
2542
2543     char *psz_name;
2544     vlc_value_t val, val2;
2545
2546     if( queryctrl.flags & V4L2_CTRL_FLAG_GRABBED )
2547         msg_Dbg( p_obj, "    control is busy" );
2548     if( queryctrl.flags & V4L2_CTRL_FLAG_READ_ONLY )
2549         msg_Dbg( p_obj, "    control is read-only" );
2550
2551     for( i = 0; controls[i].psz_name != NULL; i++ )
2552         if( controls[i].i_cid == queryctrl.id ) break;
2553
2554     if( controls[i].psz_name )
2555     {
2556         psz_name = strdup( controls[i].psz_name );
2557         char psz_cfg_name[40];
2558         sprintf( psz_cfg_name, CFG_PREFIX "%s", psz_name );
2559         i_val = var_CreateGetInteger( p_obj, psz_cfg_name );
2560         var_Destroy( p_obj, psz_cfg_name );
2561     }
2562     else
2563     {
2564         psz_name = strdup( (const char *)queryctrl.name );
2565         name2var( (unsigned char *)psz_name );
2566         i_val = -1;
2567     }
2568
2569     switch( queryctrl.type )
2570     {
2571         case V4L2_CTRL_TYPE_INTEGER:
2572             msg_Dbg( p_obj, "    integer control" );
2573             msg_Dbg( p_obj,
2574                      "    valid values: %d to %d by steps of %d",
2575                      queryctrl.minimum, queryctrl.maximum,
2576                      queryctrl.step );
2577
2578             var_Create( p_obj, psz_name,
2579                         VLC_VAR_INTEGER | VLC_VAR_HASMIN | VLC_VAR_HASMAX
2580                       | VLC_VAR_HASSTEP | VLC_VAR_ISCOMMAND );
2581             val.i_int = queryctrl.minimum;
2582             var_Change( p_obj, psz_name, VLC_VAR_SETMIN, &val, NULL );
2583             val.i_int = queryctrl.maximum;
2584             var_Change( p_obj, psz_name, VLC_VAR_SETMAX, &val, NULL );
2585             val.i_int = queryctrl.step;
2586             var_Change( p_obj, psz_name, VLC_VAR_SETSTEP, &val, NULL );
2587             break;
2588         case V4L2_CTRL_TYPE_BOOLEAN:
2589             msg_Dbg( p_obj, "    boolean control" );
2590             var_Create( p_obj, psz_name,
2591                         VLC_VAR_BOOL | VLC_VAR_ISCOMMAND );
2592             break;
2593         case V4L2_CTRL_TYPE_MENU:
2594             msg_Dbg( p_obj, "    menu control" );
2595             var_Create( p_obj, psz_name,
2596                         VLC_VAR_INTEGER | VLC_VAR_HASCHOICE
2597                       | VLC_VAR_ISCOMMAND );
2598             memset( &querymenu, 0, sizeof( querymenu ) );
2599             for( i_mid = queryctrl.minimum;
2600                  i_mid <= (unsigned)queryctrl.maximum;
2601                  i_mid++ )
2602             {
2603                 querymenu.index = i_mid;
2604                 querymenu.id = queryctrl.id;
2605                 if( v4l2_ioctl( i_fd, VIDIOC_QUERYMENU, &querymenu ) >= 0 )
2606                 {
2607                     msg_Dbg( p_obj, "        %d: %s",
2608                              querymenu.index, querymenu.name );
2609                     val.i_int = querymenu.index;
2610                     val2.psz_string = (char *)querymenu.name;
2611                     var_Change( p_obj, psz_name,
2612                                 VLC_VAR_ADDCHOICE, &val, &val2 );
2613                 }
2614             }
2615             break;
2616         case V4L2_CTRL_TYPE_BUTTON:
2617             msg_Dbg( p_obj, "    button control" );
2618             var_Create( p_obj, psz_name,
2619                         VLC_VAR_VOID | VLC_VAR_ISCOMMAND );
2620             break;
2621         case V4L2_CTRL_TYPE_CTRL_CLASS:
2622             msg_Dbg( p_obj, "    control class" );
2623             var_Create( p_obj, psz_name, VLC_VAR_VOID );
2624             break;
2625         default:
2626             msg_Dbg( p_obj, "    unknown control type (FIXME)" );
2627             /* FIXME */
2628             break;
2629     }
2630
2631     switch( queryctrl.type )
2632     {
2633         case V4L2_CTRL_TYPE_INTEGER:
2634         case V4L2_CTRL_TYPE_BOOLEAN:
2635         case V4L2_CTRL_TYPE_MENU:
2636             {
2637                 struct v4l2_control control;
2638                 msg_Dbg( p_obj, "    default value: %d",
2639                          queryctrl.default_value );
2640                 memset( &control, 0, sizeof( control ) );
2641                 control.id = queryctrl.id;
2642                 if( v4l2_ioctl( i_fd, VIDIOC_G_CTRL, &control ) >= 0 )
2643                 {
2644                     msg_Dbg( p_obj, "    current value: %d", control.value );
2645                 }
2646                 if( i_val == -1 )
2647                 {
2648                     i_val = control.value;
2649                     if( b_reset && queryctrl.default_value != control.value )
2650                     {
2651                         msg_Dbg( p_obj, "    reset value to default" );
2652                         Control( p_obj, p_sys, i_fd, psz_name,
2653                                  queryctrl.id, queryctrl.default_value );
2654                     }
2655                 }
2656                 else
2657                 {
2658                     Control( p_obj, p_sys, i_fd, psz_name,
2659                              queryctrl.id, i_val );
2660                 }
2661             }
2662             break;
2663         default:
2664             break;
2665     }
2666
2667     val.psz_string = (char *)queryctrl.name;
2668     var_Change( p_obj, psz_name, VLC_VAR_SETTEXT, &val, NULL );
2669     val.i_int = queryctrl.id;
2670     val2.psz_string = (char *)psz_name;
2671     var_Change( p_obj, "allcontrols", VLC_VAR_ADDCHOICE, &val, &val2 );
2672     /* bad things happen changing MPEG mid-stream
2673      * so don't add to Ext Settings GUI */
2674     if( V4L2_CTRL_ID2CLASS( queryctrl.id ) != V4L2_CTRL_CLASS_MPEG )
2675         var_Change( p_obj, "controls", VLC_VAR_ADDCHOICE, &val, &val2 );
2676
2677     switch( var_Type( p_obj, psz_name ) & VLC_VAR_TYPE )
2678     {
2679         case VLC_VAR_BOOL:
2680             var_SetBool( p_obj, psz_name, i_val );
2681             break;
2682         case VLC_VAR_INTEGER:
2683             var_SetInteger( p_obj, psz_name, i_val );
2684             break;
2685         case VLC_VAR_VOID:
2686             break;
2687         default:
2688             msg_Warn( p_obj, "FIXME: %s %s %d", __FILE__, __func__,
2689                       __LINE__ );
2690             break;
2691     }
2692
2693     if( b_demux )
2694         var_AddCallback( p_obj, psz_name,
2695                         DemuxControlCallback, (void*)(intptr_t)queryctrl.id );
2696     else
2697         var_AddCallback( p_obj, psz_name,
2698                         AccessControlCallback, (void*)(intptr_t)queryctrl.id );
2699
2700     free( psz_name );
2701 }
2702
2703 /*****************************************************************************
2704  * List all user-class v4l2 controls, set them to the user specified
2705  * value and create the relevant variables to enable runtime changes
2706  *****************************************************************************/
2707 static int ControlList( vlc_object_t *p_obj, demux_sys_t *p_sys, int i_fd,
2708                         bool b_reset, bool b_demux )
2709 {
2710     struct v4l2_queryctrl queryctrl;
2711     int i_cid;
2712
2713     memset( &queryctrl, 0, sizeof( queryctrl ) );
2714
2715     /* A list of available controls (aka the variable name) will be
2716      * stored as choices in the "allcontrols" variable. We'll thus be able
2717      * to use those to create an appropriate interface
2718      * A list of available controls that can be changed mid-stream will
2719      * be stored in the "controls" variable */
2720     var_Create( p_obj, "controls", VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
2721     var_Create( p_obj, "allcontrols", VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
2722
2723     var_Create( p_obj, "controls-update", VLC_VAR_VOID | VLC_VAR_ISCOMMAND );
2724
2725     /* Add a control to reset all controls to their default values */
2726     vlc_value_t val, val2;
2727     var_Create( p_obj, "controls-reset", VLC_VAR_VOID | VLC_VAR_ISCOMMAND );
2728     val.psz_string = _( "Reset controls to default" );
2729     var_Change( p_obj, "controls-reset", VLC_VAR_SETTEXT, &val, NULL );
2730     val.i_int = -1;
2731     val2.psz_string = (char *)"controls-reset";
2732     var_Change( p_obj, "controls", VLC_VAR_ADDCHOICE, &val, &val2 );
2733     if (b_demux)
2734         var_AddCallback( p_obj, "controls-reset", DemuxControlResetCallback, NULL );
2735     else
2736         var_AddCallback( p_obj, "controls-reset", AccessControlResetCallback, NULL );
2737
2738     queryctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
2739     if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2740     {
2741         msg_Dbg( p_obj, "Extended control API supported by v4l2 driver" );
2742
2743         /* List extended controls */
2744         queryctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
2745         while( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2746         {
2747             if( queryctrl.type == V4L2_CTRL_TYPE_CTRL_CLASS )
2748             {
2749                 msg_Dbg( p_obj, "%s", queryctrl.name );
2750                 queryctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
2751                 continue;
2752             }
2753             switch( V4L2_CTRL_ID2CLASS( queryctrl.id ) )
2754             {
2755                 case V4L2_CTRL_CLASS_USER:
2756                     msg_Dbg( p_obj, "Available control: %s (%x)",
2757                              queryctrl.name, queryctrl.id );
2758                     break;
2759                 case V4L2_CTRL_CLASS_MPEG:
2760                     name2var( queryctrl.name );
2761                     msg_Dbg( p_obj, "Available MPEG control: %s (%x)",
2762                              queryctrl.name, queryctrl.id );
2763                     break;
2764                 default:
2765                     msg_Dbg( p_obj, "Available private control: %s (%x)",
2766                              queryctrl.name, queryctrl.id );
2767                     break;
2768             }
2769             ControlListPrint( p_obj, p_sys, i_fd, queryctrl, b_reset, b_demux );
2770             queryctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
2771         }
2772     }
2773     else
2774     {
2775         msg_Dbg( p_obj, "Extended control API not supported by v4l2 driver" );
2776
2777         /* List public controls */
2778         for( i_cid = V4L2_CID_BASE;
2779              i_cid < V4L2_CID_LASTP1;
2780              i_cid ++ )
2781         {
2782             queryctrl.id = i_cid;
2783             if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2784             {
2785                 if( queryctrl.flags & V4L2_CTRL_FLAG_DISABLED )
2786                     continue;
2787                 msg_Dbg( p_obj, "Available control: %s (%x)",
2788                          queryctrl.name, queryctrl.id );
2789                 ControlListPrint( p_obj, p_sys, i_fd, queryctrl,
2790                                   b_reset, b_demux );
2791             }
2792         }
2793
2794         /* List private controls */
2795         for( i_cid = V4L2_CID_PRIVATE_BASE;
2796              ;
2797              i_cid ++ )
2798         {
2799             queryctrl.id = i_cid;
2800             if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2801             {
2802                 if( queryctrl.flags & V4L2_CTRL_FLAG_DISABLED )
2803                     continue;
2804                 msg_Dbg( p_obj, "Available private control: %s (%x)",
2805                          queryctrl.name, queryctrl.id );
2806                 ControlListPrint( p_obj, p_sys, i_fd, queryctrl,
2807                                   b_reset, b_demux );
2808             }
2809             else
2810                 break;
2811         }
2812     }
2813
2814     return VLC_SUCCESS;
2815 }
2816
2817 static void SetAvailControlsByString( vlc_object_t *p_obj, demux_sys_t *p_sys,
2818                                       int i_fd )
2819 {
2820     char *psz_parser = p_sys->psz_set_ctrls;
2821     vlc_value_t val, text, name;
2822
2823     if( psz_parser == NULL )
2824         return;
2825
2826     if( *psz_parser == '{' )
2827         psz_parser++;
2828
2829     int i_ret = var_Change( p_obj, "allcontrols", VLC_VAR_GETCHOICES,
2830                             &val, &text );
2831     if( i_ret < 0 )
2832     {
2833         msg_Err( p_obj, "Oops, can't find 'allcontrols' variable." );
2834         return;
2835     }
2836
2837     while( *psz_parser && *psz_parser != '}' )
2838     {
2839         char *psz_delim, *psz_assign;
2840
2841         while( *psz_parser == ',' || *psz_parser == ' ' )
2842             psz_parser++;
2843
2844         psz_delim = strchr( psz_parser, ',' );
2845         if( psz_delim == NULL )
2846             psz_delim = strchr( psz_parser, '}' );
2847         if( psz_delim == NULL )
2848             psz_delim = psz_parser + strlen( psz_parser );
2849
2850         psz_assign = memchr( psz_parser, '=', psz_delim - psz_parser );
2851         if( psz_assign == NULL )
2852         {
2853             char *psz_name = strndup( psz_parser, psz_delim - psz_parser );
2854             msg_Err( p_obj, "%s missing '='", psz_name );
2855             free( psz_name );
2856             psz_parser = psz_delim + 1;
2857             continue;
2858         }
2859
2860         for( int i = 0;
2861              i < val.p_list->i_count ;//&& psz_parser < psz_assign;
2862              i++ )
2863         {
2864             const char *psz_var = text.p_list->p_values[i].psz_string;
2865             int i_cid = val.p_list->p_values[i].i_int;
2866             var_Change( p_obj, psz_var, VLC_VAR_GETTEXT, &name, NULL );
2867             const char *psz_name = name.psz_string;
2868
2869             int i_availstrlen = strlen( psz_name );
2870             int i_parsestrlen = psz_assign - psz_parser;
2871             int i_maxstrlen = __MAX( i_availstrlen, i_parsestrlen);
2872
2873             if( !strncasecmp( psz_name, psz_parser, i_maxstrlen ) )
2874             {
2875                 Control( p_obj, p_sys, i_fd, psz_name, i_cid,
2876                          strtol( ++psz_assign, &psz_parser, 0) );
2877             }
2878             free( name.psz_string );
2879         }
2880
2881         if( psz_parser < psz_assign )
2882         {
2883             char *psz_name = strndup( psz_parser, psz_assign - psz_parser );
2884             msg_Err( p_obj, "Control %s not available", psz_name );
2885             free( psz_name );
2886             psz_parser = ( *psz_delim ) ? ( psz_delim + 1 ) : psz_delim;
2887         }
2888     }
2889     var_FreeList( &val, &text );
2890 }
2891
2892 /*****************************************************************************
2893  * Reset all user-class v4l2 controls to their default value
2894  *****************************************************************************/
2895 static int ControlReset( vlc_object_t *p_obj, demux_sys_t *p_sys, int i_fd )
2896 {
2897     struct v4l2_queryctrl queryctrl;
2898     int i_cid;
2899     memset( &queryctrl, 0, sizeof( queryctrl ) );
2900
2901     queryctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
2902     if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2903     {
2904         /* Extended control API supported */
2905         queryctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
2906         while( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2907         {
2908             if( queryctrl.type == V4L2_CTRL_TYPE_CTRL_CLASS
2909              || V4L2_CTRL_ID2CLASS( queryctrl.id ) == V4L2_CTRL_CLASS_MPEG )
2910             {
2911                 queryctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
2912                 continue;
2913             }
2914             struct v4l2_control control;
2915             memset( &control, 0, sizeof( control ) );
2916             control.id = queryctrl.id;
2917             if( v4l2_ioctl( i_fd, VIDIOC_G_CTRL, &control ) >= 0
2918              && queryctrl.default_value != control.value )
2919             {
2920                 int i;
2921                 for( i = 0; controls[i].psz_name != NULL; i++ )
2922                     if( controls[i].i_cid == queryctrl.id ) break;
2923                 name2var( queryctrl.name );
2924                 Control( p_obj, p_sys, i_fd,
2925                          controls[i].psz_name ? controls[i].psz_name
2926                           : (const char *)queryctrl.name,
2927                          queryctrl.id, queryctrl.default_value );
2928             }
2929             queryctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
2930         }
2931     }
2932     else
2933     {
2934
2935         /* public controls */
2936         for( i_cid = V4L2_CID_BASE;
2937              i_cid < V4L2_CID_LASTP1;
2938              i_cid ++ )
2939         {
2940             queryctrl.id = i_cid;
2941             if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2942             {
2943                 struct v4l2_control control;
2944                 if( queryctrl.flags & V4L2_CTRL_FLAG_DISABLED )
2945                     continue;
2946                 memset( &control, 0, sizeof( control ) );
2947                 control.id = queryctrl.id;
2948                 if( v4l2_ioctl( i_fd, VIDIOC_G_CTRL, &control ) >= 0
2949                  && queryctrl.default_value != control.value )
2950                 {
2951                     int i;
2952                     for( i = 0; controls[i].psz_name != NULL; i++ )
2953                         if( controls[i].i_cid == queryctrl.id ) break;
2954                     name2var( queryctrl.name );
2955                     Control( p_obj, p_sys, i_fd,
2956                              controls[i].psz_name ? controls[i].psz_name
2957                               : (const char *)queryctrl.name,
2958                              queryctrl.id, queryctrl.default_value );
2959                 }
2960             }
2961         }
2962
2963         /* private controls */
2964         for( i_cid = V4L2_CID_PRIVATE_BASE;
2965              ;
2966              i_cid ++ )
2967         {
2968             queryctrl.id = i_cid;
2969             if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2970             {
2971                 struct v4l2_control control;
2972                 if( queryctrl.flags & V4L2_CTRL_FLAG_DISABLED )
2973                     continue;
2974                 memset( &control, 0, sizeof( control ) );
2975                 control.id = queryctrl.id;
2976                 if( v4l2_ioctl( i_fd, VIDIOC_G_CTRL, &control ) >= 0
2977                  && queryctrl.default_value != control.value )
2978                 {
2979                     name2var( queryctrl.name );
2980                     Control( p_obj, p_sys, i_fd, (const char *)queryctrl.name,
2981                              queryctrl.id, queryctrl.default_value );
2982                 }
2983             }
2984             else
2985                 break;
2986         }
2987     }
2988     return VLC_SUCCESS;
2989 }
2990
2991 /*****************************************************************************
2992  * Issue user-class v4l2 controls
2993  *****************************************************************************/
2994 static int Control( vlc_object_t *p_obj, demux_sys_t *p_sys, int i_fd,
2995                     const char *psz_name, int i_cid, int i_value )
2996 {
2997     (void)p_sys;
2998     struct v4l2_queryctrl queryctrl;
2999     struct v4l2_control control;
3000     struct v4l2_ext_control ext_control;
3001     struct v4l2_ext_controls ext_controls;
3002
3003     if( i_value == -1 )
3004         return VLC_SUCCESS;
3005
3006     memset( &queryctrl, 0, sizeof( queryctrl ) );
3007
3008     queryctrl.id = i_cid;
3009
3010     if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) < 0
3011         || queryctrl.flags & V4L2_CTRL_FLAG_DISABLED )
3012     {
3013         msg_Dbg( p_obj, "%s (%x) control is not supported.", psz_name, i_cid );
3014         return VLC_EGENERIC;
3015     }
3016
3017     memset( &control, 0, sizeof( control ) );
3018     memset( &ext_control, 0, sizeof( ext_control ) );
3019     memset( &ext_controls, 0, sizeof( ext_controls ) );
3020     control.id = i_cid;
3021     ext_control.id = i_cid;
3022     ext_controls.ctrl_class = V4L2_CTRL_ID2CLASS( i_cid );
3023     ext_controls.count = 1;
3024     ext_controls.controls = &ext_control;
3025
3026     int i_ret = -1;
3027
3028     if( i_value >= queryctrl.minimum && i_value <= queryctrl.maximum )
3029     {
3030         ext_control.value = i_value;
3031         if( v4l2_ioctl( i_fd, VIDIOC_S_EXT_CTRLS, &ext_controls ) < 0 )
3032         {
3033             control.value = i_value;
3034             if( v4l2_ioctl( i_fd, VIDIOC_S_CTRL, &control ) < 0 )
3035             {
3036                 msg_Err( p_obj, "unable to set %s (%x) to %d (%m)",
3037                          psz_name, i_cid, i_value );
3038                 return VLC_EGENERIC;
3039             }
3040             i_ret = v4l2_ioctl( i_fd, VIDIOC_G_CTRL, &control );
3041         }
3042         else
3043         {
3044             i_ret = v4l2_ioctl( i_fd, VIDIOC_G_EXT_CTRLS, &ext_controls );
3045             control.value = ext_control.value;
3046         }
3047     }
3048
3049     if( i_ret >= 0 )
3050     {
3051         vlc_value_t val;
3052         msg_Dbg( p_obj, "video %s: %d", psz_name, control.value );
3053         switch( var_Type( p_obj, psz_name ) & VLC_VAR_TYPE )
3054         {
3055             case VLC_VAR_BOOL:
3056                 val.b_bool = control.value;
3057                 var_Change( p_obj, psz_name, VLC_VAR_SETVALUE, &val, NULL );
3058                 var_SetVoid( p_obj, "controls-update" );
3059                 break;
3060             case VLC_VAR_INTEGER:
3061                 val.i_int = control.value;
3062                 var_Change( p_obj, psz_name, VLC_VAR_SETVALUE, &val, NULL );
3063                 var_SetVoid( p_obj, "controls-update" );
3064                 break;
3065         }
3066     }
3067     return VLC_SUCCESS;
3068 }
3069
3070 /*****************************************************************************
3071  * On the fly change settings callback
3072  *****************************************************************************/
3073 static int DemuxControlCallback( vlc_object_t *p_this,
3074     const char *psz_var, vlc_value_t oldval, vlc_value_t newval,
3075     void *p_data )
3076 {
3077     (void)oldval;
3078     demux_t *p_demux = (demux_t*)p_this;
3079     demux_sys_t *p_sys = p_demux->p_sys;
3080     int i_cid = (long int)p_data;
3081
3082     int i_fd = p_sys->i_fd;
3083
3084     if( i_fd < 0 )
3085         return VLC_EGENERIC;
3086
3087     Control( p_this, p_sys, i_fd, psz_var, i_cid, newval.i_int );
3088
3089     return VLC_EGENERIC;
3090 }
3091
3092 static int DemuxControlResetCallback( vlc_object_t *p_this,
3093     const char *psz_var, vlc_value_t oldval, vlc_value_t newval, void *p_data )
3094 {
3095     (void)psz_var;    (void)oldval;    (void)newval;    (void)p_data;
3096     demux_t *p_demux = (demux_t*)p_this;
3097     demux_sys_t *p_sys = p_demux->p_sys;
3098
3099     int i_fd = p_sys->i_fd;
3100
3101     if( i_fd < 0 )
3102         return VLC_EGENERIC;
3103
3104     ControlReset( p_this, p_sys, i_fd );
3105
3106     return VLC_EGENERIC;
3107 }
3108
3109 static int AccessControlCallback( vlc_object_t *p_this,
3110     const char *psz_var, vlc_value_t oldval, vlc_value_t newval,
3111     void *p_data )
3112 {
3113     (void)oldval;
3114     access_t *p_access = (access_t *)p_this;
3115     demux_sys_t *p_sys = (demux_sys_t *) p_access->p_sys;
3116     int i_cid = (long int)p_data;
3117
3118     int i_fd = p_sys->i_fd;
3119
3120     if( i_fd < 0 )
3121         return VLC_EGENERIC;
3122
3123     Control( p_this, p_sys, i_fd, psz_var, i_cid, newval.i_int );
3124
3125     return VLC_EGENERIC;
3126 }
3127
3128 static int AccessControlResetCallback( vlc_object_t *p_this,
3129     const char *psz_var, vlc_value_t oldval, vlc_value_t newval, void *p_data )
3130 {
3131     (void)psz_var;     (void)oldval;     (void)newval;     (void)p_data;
3132     access_t *p_access = (access_t *)p_this;
3133     demux_sys_t *p_sys = (demux_sys_t *) p_access->p_sys;
3134
3135     int i_fd = p_sys->i_fd;
3136
3137     if( i_fd < 0 )
3138         return VLC_EGENERIC;
3139
3140     ControlReset( p_this, p_sys, i_fd );
3141
3142     return VLC_EGENERIC;
3143 }