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_charset.h>
  44 #include <vlc_fs.h>
  45 #include <vlc_demux.h>
  46 #include <vlc_input.h>
  47
  48 #include <ctype.h>
  49 #include <assert.h>
  50 #include <errno.h>
  51 #include <fcntl.h>
  52 #include <sys/ioctl.h>
  53 #include <sys/mman.h>
  54
  55 #if defined(HAVE_LINUX_VIDEODEV2_H)
  56 #   include <linux/videodev2.h>
  57 #elif defined(HAVE_SYS_VIDEOIO_H)
  58 #   include <sys/videoio.h>
  59 #else
  60 #   error "No Video4Linux2 headers found."
  61 #endif
  62
  63 #include <poll.h>
  64
  65 #ifdef HAVE_LIBV4L2
  66 #   include <libv4l2.h>
  67 #endif
  68
  69 /*****************************************************************************
  70  * Module descriptior
  71  *****************************************************************************/
  72
  73 static int  DemuxOpen ( vlc_object_t * );
  74 static void DemuxClose( vlc_object_t * );
  75 static int  AccessOpen ( vlc_object_t * );
  76 static void AccessClose( vlc_object_t * );
  77
  78 #define DEVICE_TEXT N_( "Device" )
  79 #define DEVICE_LONGTEXT N_( \
  80     "Video device (Default: /dev/video0)." )
  81 #define STANDARD_TEXT N_( "Standard" )
  82 #define STANDARD_LONGTEXT N_( \
  83     "Video standard (Default, SECAM, PAL, or NTSC)." )
  84 #define CHROMA_TEXT N_("Video input chroma format")
  85 #define CHROMA_LONGTEXT N_( \
  86     "Force the Video4Linux2 video device to use a specific chroma format " \
  87     "(eg. I420 or I422 for raw images, MJPG for M-JPEG compressed input) " \
  88     "(Complete list: GREY, I240, RV16, RV15, RV24, RV32, YUY2, YUYV, UYVY, " \
  89     "I41N, I422, I420, I411, I410, MJPG)")
  90 #define INPUT_TEXT N_( "Input" )
  91 #define INPUT_LONGTEXT N_( \
  92     "Input of the card to use (see debug)." )
  93 #define AUDIO_INPUT_TEXT N_( "Audio input" )
  94 #define AUDIO_INPUT_LONGTEXT N_( \
  95     "Audio input of the card to use (see debug)." )
  96 #define IOMETHOD_TEXT N_( "IO Method" )
  97 #define IOMETHOD_LONGTEXT N_( \
  98     "IO Method (READ, MMAP, USERPTR)." )
  99 #define WIDTH_TEXT N_( "Width" )
 100 #define WIDTH_LONGTEXT N_( \
 101     "Force width (-1 for autodetect, 0 for driver default)." )
 102 #define HEIGHT_TEXT N_( "Height" )
 103 #define HEIGHT_LONGTEXT N_( \
 104     "Force height (-1 for autodetect, 0 for driver default)." )
 105 #define FPS_TEXT N_( "Framerate" )
 106 #define FPS_LONGTEXT N_( "Framerate to capture, if applicable " \
 107     "(0 for autodetect)." )
 108
 109 #ifdef HAVE_LIBV4L2
 110 #define LIBV4L2_TEXT N_( "Use libv4l2" )
 111 #define LIBV4L2_LONGTEXT N_( \
 112     "Force usage of the libv4l2 wrapper." )
 113 #endif
 114
 115 #define CTRL_RESET_TEXT N_( "Reset v4l2 controls" )
 116 #define CTRL_RESET_LONGTEXT N_( \
 117     "Reset controls to defaults provided by the v4l2 driver." )
 118 #define BRIGHTNESS_TEXT N_( "Brightness" )
 119 #define BRIGHTNESS_LONGTEXT N_( \
 120     "Brightness of the video input (if supported by the v4l2 driver)." )
 121 #define CONTRAST_TEXT N_( "Contrast" )
 122 #define CONTRAST_LONGTEXT N_( \
 123     "Contrast of the video input (if supported by the v4l2 driver)." )
 124 #define SATURATION_TEXT N_( "Saturation" )
 125 #define SATURATION_LONGTEXT N_( \
 126     "Saturation of the video input (if supported by the v4l2 driver)." )
 127 #define HUE_TEXT N_( "Hue" )
 128 #define HUE_LONGTEXT N_( \
 129     "Hue of the video input (if supported by the v4l2 driver)." )
 130 #define BLACKLEVEL_TEXT N_( "Black level" )
 131 #define BLACKLEVEL_LONGTEXT N_( \
 132     "Black level of the video input (if supported by the v4l2 driver)." )
 133 #define AUTOWHITEBALANCE_TEXT N_( "Auto white balance" )
 134 #define AUTOWHITEBALANCE_LONGTEXT N_( \
 135     "Automatically set the white balance of the video input " \
 136     "(if supported by the v4l2 driver)." )
 137 #define DOWHITEBALANCE_TEXT N_( "Do white balance" )
 138 #define DOWHITEBALANCE_LONGTEXT N_( \
 139     "Trigger a white balancing action, useless if auto white balance is " \
 140     "activated (if supported by the v4l2 driver)." )
 141 #define REDBALANCE_TEXT N_( "Red balance" )
 142 #define REDBALANCE_LONGTEXT N_( \
 143     "Red balance of the video input (if supported by the v4l2 driver)." )
 144 #define BLUEBALANCE_TEXT N_( "Blue balance" )
 145 #define BLUEBALANCE_LONGTEXT N_( \
 146     "Blue balance of the video input (if supported by the v4l2 driver)." )
 147 #define GAMMA_TEXT N_( "Gamma" )
 148 #define GAMMA_LONGTEXT N_( \
 149     "Gamma of the video input (if supported by the v4l2 driver)." )
 150 #define EXPOSURE_TEXT N_( "Exposure" )
 151 #define EXPOSURE_LONGTEXT N_( \
 152     "Exposure of the video input (if supported by the v4L2 driver)." )
 153 #define AUTOGAIN_TEXT N_( "Auto gain" )
 154 #define AUTOGAIN_LONGTEXT N_( \
 155     "Automatically set the video input's gain (if supported by the " \
 156     "v4l2 driver)." )
 157 #define GAIN_TEXT N_( "Gain" )
 158 #define GAIN_LONGTEXT N_( \
 159     "Video input's gain (if supported by the v4l2 driver)." )
 160 #define HFLIP_TEXT N_( "Horizontal flip" )
 161 #define HFLIP_LONGTEXT N_( \
 162     "Flip the video horizontally (if supported by the v4l2 driver)." )
 163 #define VFLIP_TEXT N_( "Vertical flip" )
 164 #define VFLIP_LONGTEXT N_( \
 165     "Flip the video vertically (if supported by the v4l2 driver)." )
 166 #define HCENTER_TEXT N_( "Horizontal centering" )
 167 #define HCENTER_LONGTEXT N_( \
 168     "Set the camera's horizontal centering (if supported by the v4l2 driver)." )
 169 #define VCENTER_TEXT N_( "Vertical centering" )
 170 #define VCENTER_LONGTEXT N_( \
 171     "Set the camera's vertical centering (if supported by the v4l2 driver)." )
 172
 173 #define AUDIO_VOLUME_TEXT N_( "Volume" )
 174 #define AUDIO_VOLUME_LONGTEXT N_( \
 175     "Volume of the audio input (if supported by the v4l2 driver)." )
 176 #define AUDIO_BALANCE_TEXT N_( "Balance" )
 177 #define AUDIO_BALANCE_LONGTEXT N_( \
 178     "Balance of the audio input (if supported by the v4l2 driver)." )
 179 #define AUDIO_MUTE_TEXT N_( "Mute" )
 180 #define AUDIO_MUTE_LONGTEXT N_( \
 181     "Mute audio input (if supported by the v4l2 driver)." )
 182 #define AUDIO_BASS_TEXT N_( "Bass" )
 183 #define AUDIO_BASS_LONGTEXT N_( \
 184     "Bass level of the audio input (if supported by the v4l2 driver)." )
 185 #define AUDIO_TREBLE_TEXT N_( "Treble" )
 186 #define AUDIO_TREBLE_LONGTEXT N_( \
 187     "Treble level of the audio input (if supported by the v4l2 driver)." )
 188 #define AUDIO_LOUDNESS_TEXT N_( "Loudness" )
 189 #define AUDIO_LOUDNESS_LONGTEXT N_( \
 190     "Loudness of the audio input (if supported by the v4l2 driver)." )
 191
 192 #define S_CTRLS_TEXT N_("v4l2 driver controls")
 193 #define S_CTRLS_LONGTEXT N_( \
 194     "Set the v4l2 driver controls to the values specified using a comma " \
 195     "separated list optionally encapsulated by curly braces " \
 196     "(e.g.: {video_bitrate=6000000,audio_crc=0,stream_type=3} ). " \
 197     "To list available controls, increase verbosity (-vvv) " \
 198     "or use the v4l2-ctl application." )
 199
 200 #define TUNER_TEXT N_("Tuner id")
 201 #define TUNER_LONGTEXT N_( \
 202     "Tuner id (see debug output)." )
 203 #define FREQUENCY_TEXT N_("Frequency")
 204 #define FREQUENCY_LONGTEXT N_( \
 205     "Tuner frequency in Hz or kHz (see debug output)" )
 206 #define TUNER_AUDIO_MODE_TEXT N_("Audio mode")
 207 #define TUNER_AUDIO_MODE_LONGTEXT N_( \
 208     "Tuner audio mono/stereo and track selection." )
 209
 210 #define AUDIO_DEPRECATED_ERROR N_( \
 211     "Alsa or OSS audio capture in the v4l2 access is deprecated. " \
 212     "please use 'v4l2:/""/ :input-slave=alsa:/""/' or " \
 213     "'v4l2:/""/ :input-slave=oss:/""/' instead." )
 214
 215 #define ASPECT_TEXT N_("Picture aspect-ratio n:m")
 216 #define ASPECT_LONGTEXT N_("Define input picture aspect-ratio to use. Default is 4:3" )
 217
 218 typedef enum {
 219     IO_METHOD_AUTO,
 220     IO_METHOD_READ,
 221     IO_METHOD_MMAP,
 222     IO_METHOD_USERPTR,
 223 } io_method;
 224
 225 static const int i_standards_list[] =
 226     { V4L2_STD_UNKNOWN, V4L2_STD_SECAM, V4L2_STD_PAL, V4L2_STD_NTSC,
 227       V4L2_STD_PAL_B, V4L2_STD_PAL_B1, V4L2_STD_PAL_G, V4L2_STD_PAL_H,
 228       V4L2_STD_PAL_I, V4L2_STD_PAL_D, V4L2_STD_PAL_D1, V4L2_STD_PAL_K,
 229       V4L2_STD_PAL_M, V4L2_STD_PAL_N, V4L2_STD_PAL_Nc, V4L2_STD_PAL_60,
 230       V4L2_STD_NTSC_M, V4L2_STD_NTSC_M_JP, V4L2_STD_NTSC_443,
 231       V4L2_STD_NTSC_M_KR,
 232       V4L2_STD_SECAM_B, V4L2_STD_SECAM_D, V4L2_STD_SECAM_G,
 233       V4L2_STD_SECAM_H, V4L2_STD_SECAM_K, V4L2_STD_SECAM_K1,
 234       V4L2_STD_SECAM_L, V4L2_STD_SECAM_LC,
 235       V4L2_STD_ATSC_8_VSB, V4L2_STD_ATSC_16_VSB,
 236       };
 237 static const char *const psz_standards_list_text[] =
 238     { N_("Default"), "SECAM", "PAL",  "NTSC",
 239       "PAL_B", "PAL_B1", "PAL_G", "PAL_H", "PAL_I", "PAL_D",
 240       "PAL_D1", "PAL_K", "PAL_M", "PAL_N", "PAL_Nc", "PAL_60",
 241       "NTSC_M", "NTSC_M_JP", "NTSC_443", "NTSC_M_KR",
 242       "SECAM_B", "SECAM_D", "SECAM_G", "SECAM_H", "SECAM_K",
 243       "SECAM_K1", "SECAM_L", "SECAM_LC",
 244       "ATSC_8_VSB", "ATSC_16_VSB"
 245     };
 246
 247 static const int i_iomethod_list[] =
 248     { IO_METHOD_AUTO, IO_METHOD_READ, IO_METHOD_MMAP, IO_METHOD_USERPTR };
 249 static const char *const psz_iomethod_list_text[] =
 250     { N_("AUTO"), N_("READ"), N_("MMAP"),  N_("USERPTR") };
 251
 252 static const int i_tuner_audio_modes_list[] = {
 253       -1, V4L2_TUNER_MODE_MONO, V4L2_TUNER_MODE_STEREO,
 254       V4L2_TUNER_MODE_LANG1, V4L2_TUNER_MODE_LANG2,
 255       V4L2_TUNER_MODE_SAP, V4L2_TUNER_MODE_LANG1_LANG2 };
 256 static const char *const psz_tuner_audio_modes_list_text[] = {
 257       N_("Unspecified"),
 258       N_( "Mono" ),
 259       N_( "Stereo" ),
 260       N_( "Primary language (Analog TV tuners only)" ),
 261       N_( "Secondary language (Analog TV tuners only)" ),
 262       N_( "Second audio program (Analog TV tuners only)" ),
 263       N_( "Primary language left, Secondary language right" ) };
 264
 265 #define V4L2_DEFAULT "/dev/video0"
 266 #define CFG_PREFIX "v4l2-"
 267
 268 #ifdef HAVE_MAEMO
 269 # define DEFAULT_WIDTH  640
 270 # define DEFAULT_HEIGHT 492
 271 #endif
 272
 273 #ifndef DEFAULT_WIDTH
 274 # define DEFAULT_WIDTH  (-1)
 275 # define DEFAULT_HEIGHT (-1)
 276 #endif
 277
 278 vlc_module_begin ()
 279     set_shortname( N_("Video4Linux2") )
 280     set_description( N_("Video4Linux2 input") )
 281     set_category( CAT_INPUT )
 282     set_subcategory( SUBCAT_INPUT_ACCESS )
 283
 284     set_section( N_( "Video input" ), NULL )
 285     add_string( CFG_PREFIX "dev", "/dev/video0", DEVICE_TEXT, DEVICE_LONGTEXT,
 286                  false )
 287     add_integer( CFG_PREFIX "standard", 0, STANDARD_TEXT,
 288                  STANDARD_LONGTEXT, false )
 289         change_integer_list( i_standards_list, psz_standards_list_text )
 290     add_string( CFG_PREFIX "chroma", NULL, CHROMA_TEXT, CHROMA_LONGTEXT,
 291                 true )
 292     add_integer( CFG_PREFIX "input", 0, INPUT_TEXT, INPUT_LONGTEXT,
 293                 true )
 294         change_integer_range( 0, 0xFFFFFFFE )
 295     add_integer( CFG_PREFIX "audio-input", 0, AUDIO_INPUT_TEXT,
 296                  AUDIO_INPUT_LONGTEXT, true )
 297         change_integer_range( 0, 0xFFFFFFFE )
 298     add_integer( CFG_PREFIX "io", IO_METHOD_AUTO, IOMETHOD_TEXT,
 299                  IOMETHOD_LONGTEXT, true )
 300         change_integer_list( i_iomethod_list, psz_iomethod_list_text )
 301     add_integer( CFG_PREFIX "width", DEFAULT_WIDTH, WIDTH_TEXT,
 302                 WIDTH_LONGTEXT, true )
 303     add_integer( CFG_PREFIX "height", DEFAULT_HEIGHT, HEIGHT_TEXT,
 304                 HEIGHT_LONGTEXT, true )
 305     add_string( CFG_PREFIX "aspect-ratio", "4:3", ASPECT_TEXT,
 306               ASPECT_LONGTEXT, true )
 307     add_float( CFG_PREFIX "fps", 0, FPS_TEXT, FPS_LONGTEXT, true )
 308 #ifdef HAVE_LIBV4L2
 309     add_bool( CFG_PREFIX "use-libv4l2", false, LIBV4L2_TEXT, LIBV4L2_LONGTEXT, true );
 310 #endif
 311
 312     set_section( N_( "Tuner" ), NULL )
 313     add_integer( CFG_PREFIX "tuner", 0, TUNER_TEXT, TUNER_LONGTEXT,
 314                  true )
 315         change_integer_range( 0, 0xFFFFFFFE )
 316     add_integer( CFG_PREFIX "tuner-frequency", -1, FREQUENCY_TEXT,
 317                  FREQUENCY_LONGTEXT, true )
 318     add_integer( CFG_PREFIX "tuner-audio-mode", -1, TUNER_AUDIO_MODE_TEXT,
 319                  TUNER_AUDIO_MODE_LONGTEXT, true )
 320         change_integer_list( i_tuner_audio_modes_list,
 321                              psz_tuner_audio_modes_list_text )
 322
 323     set_section( N_( "Controls" ),
 324                  N_( "v4l2 driver controls, if supported by your v4l2 driver." ) )
 325     add_bool( CFG_PREFIX "controls-reset", false, CTRL_RESET_TEXT,
 326               CTRL_RESET_LONGTEXT, true )
 327     add_integer( CFG_PREFIX "brightness", -1, BRIGHTNESS_TEXT,
 328                  BRIGHTNESS_LONGTEXT, true )
 329     add_integer( CFG_PREFIX "contrast", -1, CONTRAST_TEXT,
 330                  CONTRAST_LONGTEXT, true )
 331     add_integer( CFG_PREFIX "saturation", -1, SATURATION_TEXT,
 332                  SATURATION_LONGTEXT, true )
 333     add_integer( CFG_PREFIX "hue", -1, HUE_TEXT,
 334                  HUE_LONGTEXT, true )
 335     add_integer( CFG_PREFIX "black-level", -1, BLACKLEVEL_TEXT,
 336                  BLACKLEVEL_LONGTEXT, true )
 337     add_integer( CFG_PREFIX "auto-white-balance", -1,
 338                  AUTOWHITEBALANCE_TEXT, AUTOWHITEBALANCE_LONGTEXT, true )
 339     add_integer( CFG_PREFIX "do-white-balance", -1, DOWHITEBALANCE_TEXT,
 340                  DOWHITEBALANCE_LONGTEXT, true )
 341     add_integer( CFG_PREFIX "red-balance", -1, REDBALANCE_TEXT,
 342                  REDBALANCE_LONGTEXT, true )
 343     add_integer( CFG_PREFIX "blue-balance", -1, BLUEBALANCE_TEXT,
 344                  BLUEBALANCE_LONGTEXT, true )
 345     add_integer( CFG_PREFIX "gamma", -1, GAMMA_TEXT,
 346                  GAMMA_LONGTEXT, true )
 347     add_integer( CFG_PREFIX "exposure", -1, EXPOSURE_TEXT,
 348                  EXPOSURE_LONGTEXT, true )
 349     add_integer( CFG_PREFIX "autogain", -1, AUTOGAIN_TEXT,
 350                  AUTOGAIN_LONGTEXT, true )
 351     add_integer( CFG_PREFIX "gain", -1, GAIN_TEXT,
 352                  GAIN_LONGTEXT, true )
 353     add_integer( CFG_PREFIX "hflip", -1, HFLIP_TEXT,
 354                  HFLIP_LONGTEXT, true )
 355     add_integer( CFG_PREFIX "vflip", -1, VFLIP_TEXT,
 356                  VFLIP_LONGTEXT, true )
 357     add_integer( CFG_PREFIX "hcenter", -1, HCENTER_TEXT,
 358                  HCENTER_LONGTEXT, true )
 359     add_integer( CFG_PREFIX "vcenter", -1, VCENTER_TEXT,
 360                  VCENTER_LONGTEXT, true )
 361     add_integer( CFG_PREFIX "audio-volume", -1, AUDIO_VOLUME_TEXT,
 362                 AUDIO_VOLUME_LONGTEXT, true )
 363     add_integer( CFG_PREFIX "audio-balance", -1, AUDIO_BALANCE_TEXT,
 364                 AUDIO_BALANCE_LONGTEXT, true )
 365     add_bool( CFG_PREFIX "audio-mute", false, AUDIO_MUTE_TEXT,
 366               AUDIO_MUTE_LONGTEXT, true )
 367     add_integer( CFG_PREFIX "audio-bass", -1, AUDIO_BASS_TEXT,
 368                 AUDIO_BASS_LONGTEXT, true )
 369     add_integer( CFG_PREFIX "audio-treble", -1, AUDIO_TREBLE_TEXT,
 370                 AUDIO_TREBLE_LONGTEXT, true )
 371     add_integer( CFG_PREFIX "audio-loudness", -1, AUDIO_LOUDNESS_TEXT,
 372                 AUDIO_LOUDNESS_LONGTEXT, true )
 373     add_string( CFG_PREFIX "set-ctrls", NULL, S_CTRLS_TEXT,
 374               S_CTRLS_LONGTEXT, true )
 375
 376     add_obsolete_string( CFG_PREFIX "adev" )
 377     add_obsolete_integer( CFG_PREFIX "audio-method" )
 378     add_obsolete_bool( CFG_PREFIX "stereo" )
 379     add_obsolete_integer( CFG_PREFIX "samplerate" )
 380
 381     add_shortcut( "v4l2" )
 382     set_capability( "access_demux", 10 )
 383     set_callbacks( DemuxOpen, DemuxClose )
 384
 385     add_submodule ()
 386     add_shortcut( "v4l2", "v4l2c" )
 387     set_description( N_("Video4Linux2 Compressed A/V") )
 388     set_capability( "access", 0 )
 389     /* use these when open as access_demux fails; VLC will use another demux */
 390     set_callbacks( AccessOpen, AccessClose )
 391
 392 vlc_module_end ()
 393
 394 /*****************************************************************************
 395  * Access: local prototypes
 396  *****************************************************************************/
 397
 398 static void CommonClose( vlc_object_t *, demux_sys_t * );
 399 static void ParseMRL( demux_sys_t *, char *, vlc_object_t * );
 400 static void GetV4L2Params( demux_sys_t *, vlc_object_t * );
 401 static void SetAvailControlsByString( vlc_object_t *, demux_sys_t *, int );
 402
 403 static int DemuxControl( demux_t *, int, va_list );
 404 static int AccessControl( access_t *, int, va_list );
 405
 406 static int Demux( demux_t * );
 407 static block_t *AccessRead( access_t * );
 408 static ssize_t AccessReadStream( access_t * p_access, uint8_t * p_buffer, size_t i_len );
 409
 410 static block_t* GrabVideo( vlc_object_t *p_demux, demux_sys_t *p_sys );
 411 static block_t* ProcessVideoFrame( vlc_object_t *p_demux, uint8_t *p_frame, size_t );
 412
 413 static bool IsPixelFormatSupported( demux_t *p_demux,
 414                                           unsigned int i_pixelformat );
 415
 416 static int OpenVideoDev( vlc_object_t *, demux_sys_t *, bool );
 417 static bool ProbeVideoDev( vlc_object_t *, demux_sys_t *,
 418                                  const char *psz_device );
 419
 420 static int ControlList( vlc_object_t *, int , bool, bool );
 421 static int Control( vlc_object_t *, int i_fd,
 422                     const char *psz_name, int i_cid, int i_value );
 423
 424 static int DemuxControlCallback( vlc_object_t *p_this, const char *psz_var,
 425                                  vlc_value_t oldval, vlc_value_t newval,
 426                                  void *p_data );
 427 static int DemuxControlResetCallback( vlc_object_t *p_this, const char *psz_var,
 428                                       vlc_value_t oldval, vlc_value_t newval,
 429                                       void *p_data );
 430 static int AccessControlCallback( vlc_object_t *p_this, const char *psz_var,
 431                                   vlc_value_t oldval, vlc_value_t newval,
 432                                   void *p_data );
 433 static int AccessControlResetCallback( vlc_object_t *p_this,
 434                                        const char *psz_var, vlc_value_t oldval,
 435                                        vlc_value_t newval, void *p_data );
 436
 437 static const struct
 438 {
 439     unsigned int i_v4l2;
 440     vlc_fourcc_t i_fourcc;
 441     int i_rmask;
 442     int i_gmask;
 443     int i_bmask;
 444 } v4l2chroma_to_fourcc[] =
 445 {
 446     /* Raw data types */
 447     { V4L2_PIX_FMT_GREY,    VLC_CODEC_GREY, 0, 0, 0 },
 448     { V4L2_PIX_FMT_HI240,   VLC_FOURCC('I','2','4','0'), 0, 0, 0 },
 449     { V4L2_PIX_FMT_RGB555,  VLC_CODEC_RGB15, 0x001f,0x03e0,0x7c00 },
 450     { V4L2_PIX_FMT_RGB565,  VLC_CODEC_RGB16, 0x001f,0x07e0,0xf800 },
 451     /* Won't work since we don't know how to handle such gmask values
 452      * correctly
 453     { V4L2_PIX_FMT_RGB555X, VLC_CODEC_RGB15, 0x007c,0xe003,0x1f00 },
 454     { V4L2_PIX_FMT_RGB565X, VLC_CODEC_RGB16, 0x00f8,0xe007,0x1f00 },
 455     */
 456     { V4L2_PIX_FMT_BGR24,   VLC_CODEC_RGB24, 0xff0000,0xff00,0xff },
 457     { V4L2_PIX_FMT_RGB24,   VLC_CODEC_RGB24, 0xff,0xff00,0xff0000 },
 458     { V4L2_PIX_FMT_BGR32,   VLC_CODEC_RGB32, 0xff0000,0xff00,0xff },
 459     { V4L2_PIX_FMT_RGB32,   VLC_CODEC_RGB32, 0xff,0xff00,0xff0000 },
 460     { V4L2_PIX_FMT_YUYV,    VLC_CODEC_YUYV, 0, 0, 0 },
 461     { V4L2_PIX_FMT_UYVY,    VLC_CODEC_UYVY, 0, 0, 0 },
 462     { V4L2_PIX_FMT_Y41P,    VLC_FOURCC('I','4','1','N'), 0, 0, 0 },
 463     { V4L2_PIX_FMT_YUV422P, VLC_CODEC_I422, 0, 0, 0 },
 464     { V4L2_PIX_FMT_YVU420,  VLC_CODEC_YV12, 0, 0, 0 },
 465     { V4L2_PIX_FMT_YUV411P, VLC_CODEC_I411, 0, 0, 0 },
 466     { V4L2_PIX_FMT_YUV410,  VLC_CODEC_I410, 0, 0, 0 },
 467
 468     /* Raw data types, not in V4L2 spec but still in videodev2.h and supported
 469      * by VLC */
 470     { V4L2_PIX_FMT_YUV420,  VLC_CODEC_I420, 0, 0, 0 },
 471     /* FIXME { V4L2_PIX_FMT_RGB444,  VLC_CODEC_RGB32 }, */
 472
 473     /* Compressed data types */
 474     { V4L2_PIX_FMT_MJPEG,   VLC_CODEC_MJPG, 0, 0, 0 },
 475     { V4L2_PIX_FMT_JPEG,    VLC_CODEC_JPEG, 0, 0, 0 },
 476 #if 0
 477     { V4L2_PIX_FMT_DV,      VLC_FOURCC('?','?','?','?') },
 478     { V4L2_PIX_FMT_MPEG,    VLC_FOURCC('?','?','?','?') },
 479 #endif
 480     { 0, 0, 0, 0, 0 }
 481 };
 482
 483 /**
 484  * List of V4L2 chromas were confident enough to use as fallbacks if the
 485  * user hasn't provided a --v4l2-chroma value.
 486  *
 487  * Try YUV chromas first, then RGB little endian and MJPEG as last resort.
 488  */
 489 static const uint32_t p_chroma_fallbacks[] =
 490 { V4L2_PIX_FMT_YUV420, V4L2_PIX_FMT_YVU420, V4L2_PIX_FMT_YUV422P,
 491   V4L2_PIX_FMT_YUYV, V4L2_PIX_FMT_UYVY, V4L2_PIX_FMT_BGR24,
 492   V4L2_PIX_FMT_BGR32, V4L2_PIX_FMT_MJPEG, V4L2_PIX_FMT_JPEG };
 493
 494 static const struct
 495 {
 496     const char *psz_name;
 497     unsigned int i_cid;
 498 } controls[] =
 499 {
 500     { "brightness", V4L2_CID_BRIGHTNESS },
 501     { "contrast", V4L2_CID_CONTRAST },
 502     { "saturation", V4L2_CID_SATURATION },
 503     { "hue", V4L2_CID_HUE },
 504     { "audio-volume", V4L2_CID_AUDIO_VOLUME },
 505     { "audio-balance", V4L2_CID_AUDIO_BALANCE },
 506     { "audio-bass", V4L2_CID_AUDIO_BASS },
 507     { "audio-treble", V4L2_CID_AUDIO_TREBLE },
 508     { "audio-mute", V4L2_CID_AUDIO_MUTE },
 509     { "audio-loudness", V4L2_CID_AUDIO_LOUDNESS },
 510     { "black-level", V4L2_CID_BLACK_LEVEL },
 511     { "auto-white-balance", V4L2_CID_AUTO_WHITE_BALANCE },
 512     { "do-white-balance", V4L2_CID_DO_WHITE_BALANCE },
 513     { "red-balance", V4L2_CID_RED_BALANCE },
 514     { "blue-balance", V4L2_CID_BLUE_BALANCE },
 515     { "gamma", V4L2_CID_GAMMA },
 516     { "exposure", V4L2_CID_EXPOSURE },
 517     { "autogain", V4L2_CID_AUTOGAIN },
 518     { "gain", V4L2_CID_GAIN },
 519     { "hflip", V4L2_CID_HFLIP },
 520     { "vflip", V4L2_CID_VFLIP },
 521     { "hcenter", V4L2_CID_HCENTER },
 522     { "vcenter", V4L2_CID_VCENTER },
 523     { NULL, 0 }
 524 };
 525
 526 struct buffer_t
 527 {
 528     void *  start;
 529     size_t  length;
 530 };
 531
 532 struct demux_sys_t
 533 {
 534     char *psz_device;  /* Main device from MRL */
 535     int  i_fd;
 536
 537     char *psz_requested_chroma;
 538
 539     /* Video */
 540     io_method io;
 541
 542     struct v4l2_capability dev_cap;
 543
 544     uint32_t i_input;
 545     struct v4l2_input *p_inputs;
 546     unsigned i_selected_input;
 547
 548     unsigned i_standard;
 549     struct v4l2_standard *p_standards;
 550     v4l2_std_id i_selected_standard_id;
 551
 552     uint32_t i_audio;
 553     /* V4L2 devices cannot have more than 32 audio inputs */
 554     struct v4l2_audio p_audios[32];
 555     unsigned i_selected_audio_input;
 556
 557     uint32_t i_tuner;
 558     struct v4l2_tuner *p_tuners;
 559
 560     unsigned i_codec;
 561     struct v4l2_fmtdesc *p_codecs;
 562
 563     struct buffer_t *p_buffers;
 564     unsigned int i_nbuffers;
 565
 566     int i_width;
 567     int i_height;
 568     unsigned int i_aspect;
 569     float f_fps;            /* <= 0.0 mean to grab at full rate */
 570     int i_fourcc;
 571     uint32_t i_block_flags;
 572
 573     es_out_id_t *p_es;
 574
 575     /* Tuner */
 576     uint32_t i_cur_tuner;
 577     int i_frequency;
 578     int i_audio_mode;
 579
 580     /* Controls */
 581     char *psz_set_ctrls;
 582
 583 #ifdef HAVE_LIBV4L2
 584     bool b_libv4l2;
 585 #endif
 586 };
 587
 588 #ifndef HAVE_LIBV4L2
 589 #   define v4l2_close close
 590 #   define v4l2_dup dup
 591 #   define v4l2_ioctl ioctl
 592 #   define v4l2_read read
 593 #   define v4l2_mmap mmap
 594 #   define v4l2_munmap munmap
 595 #endif
 596
 597 static int FindMainDevice( vlc_object_t *p_this, demux_sys_t *p_sys,
 598                            bool b_demux )
 599 {
 600     /* TODO: if using default device, loop through all /dev/video* until
 601      * one works */
 602     msg_Dbg( p_this, "opening device '%s'", p_sys->psz_device );
 603     if( ProbeVideoDev( p_this, p_sys, p_sys->psz_device ) )
 604     {
 605         msg_Dbg( p_this, "'%s' is a video device", p_sys->psz_device );
 606         p_sys->i_fd = OpenVideoDev( p_this, p_sys, b_demux );
 607     }
 608
 609     if( p_sys->i_fd < 0 ) return VLC_EGENERIC;
 610     return VLC_SUCCESS;
 611 }
 612
 613 /*****************************************************************************
 614  * DemuxOpen: opens v4l2 device, access_demux callback
 615  *****************************************************************************
 616  *
 617  * url: <video device>::::
 618  *
 619  *****************************************************************************/
 620 static int DemuxOpen( vlc_object_t *p_this )
 621 {
 622     demux_t     *p_demux = (demux_t*)p_this;
 623     demux_sys_t *p_sys;
 624
 625     /* Only when selected */
 626     if( strcmp( p_demux->psz_access, "v4l2" ) )
 627         return VLC_EGENERIC;
 628
 629     /* Set up p_demux */
 630     p_demux->pf_control = DemuxControl;
 631     p_demux->pf_demux = Demux;
 632     p_demux->info.i_update = 0;
 633     p_demux->info.i_title = 0;
 634     p_demux->info.i_seekpoint = 0;
 635
 636     p_demux->p_sys = p_sys = calloc( 1, sizeof( demux_sys_t ) );
 637     if( p_sys == NULL ) return VLC_ENOMEM;
 638
 639     GetV4L2Params(p_sys, (vlc_object_t *) p_demux);
 640
 641     ParseMRL( p_sys, p_demux->psz_location, (vlc_object_t *) p_demux );
 642
 643 #ifdef HAVE_LIBV4L2
 644     if( !var_InheritBool( p_this, CFG_PREFIX "use-libv4l2" ) )
 645     {
 646         msg_Dbg( p_this, "Trying direct kernel v4l2" );
 647         p_sys->b_libv4l2 = false;
 648         if( FindMainDevice( p_this, p_sys, true ) == VLC_SUCCESS)
 649             return VLC_SUCCESS;
 650     }
 651
 652     msg_Dbg( p_this, "Trying libv4l2 wrapper" );
 653     p_sys->b_libv4l2 = true;
 654 #endif
 655     if( FindMainDevice( p_this, p_sys, true ) == VLC_SUCCESS)
 656         return VLC_SUCCESS;
 657
 658     DemuxClose( p_this );
 659     return VLC_EGENERIC;
 660 }
 661
 662 /*****************************************************************************
 663  * GetV4L2Params: fill in p_sys parameters (shared by DemuxOpen and AccessOpen)
 664  *****************************************************************************/
 665 static void GetV4L2Params( demux_sys_t *p_sys, vlc_object_t *p_obj )
 666 {
 667     p_sys->psz_device = var_CreateGetNonEmptyString( p_obj, "v4l2-dev" );
 668
 669     p_sys->i_selected_standard_id =
 670         var_CreateGetInteger( p_obj, "v4l2-standard" );
 671     p_sys->i_selected_input = var_CreateGetInteger( p_obj, "v4l2-input" );
 672     p_sys->i_selected_audio_input =
 673         var_CreateGetInteger( p_obj, "v4l2-audio-input" );
 674
 675     p_sys->io = var_CreateGetInteger( p_obj, "v4l2-io" );
 676
 677     p_sys->i_width = var_CreateGetInteger( p_obj, "v4l2-width" );
 678     p_sys->i_height = var_CreateGetInteger( p_obj, "v4l2-height" );
 679
 680     var_Create( p_obj, "v4l2-controls-reset", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
 681
 682     p_sys->f_fps = var_CreateGetFloat( p_obj, "v4l2-fps" );
 683     p_sys->psz_requested_chroma = var_CreateGetString( p_obj, "v4l2-chroma" );
 684
 685     p_sys->i_cur_tuner = var_CreateGetInteger( p_obj, "v4l2-tuner" );
 686     p_sys->i_frequency = var_CreateGetInteger( p_obj, "v4l2-tuner-frequency" );
 687     p_sys->i_audio_mode = var_CreateGetInteger( p_obj, "v4l2-tuner-audio-mode" );
 688
 689     p_sys->psz_set_ctrls = var_CreateGetString( p_obj, "v4l2-set-ctrls" );
 690
 691     char *psz_aspect = var_CreateGetString( p_obj, "v4l2-aspect-ratio" );
 692     char *psz_delim = !EMPTY_STR(psz_aspect) ? strchr( psz_aspect, ':' ) : NULL;
 693     if( psz_delim )
 694     {
 695         p_sys->i_aspect = atoi( psz_aspect ) * VOUT_ASPECT_FACTOR / atoi( psz_delim + 1 );
 696     }
 697     else
 698     {
 699         p_sys->i_aspect = 4 * VOUT_ASPECT_FACTOR / 3 ;
 700
 701     }
 702     free( psz_aspect );
 703
 704     p_sys->i_fd = -1;
 705
 706     p_sys->p_es = NULL;
 707 }
 708
 709 /*****************************************************************************
 710  * ParseMRL: parse the options contained in the MRL
 711  *****************************************************************************/
 712 static void ParseMRL( demux_sys_t *p_sys, char *psz_path, vlc_object_t *p_obj )
 713 {
 714     char *psz_dup = strdup( psz_path );
 715     char *psz_parser = psz_dup;
 716
 717     while( *psz_parser && *psz_parser != ':' )
 718     {
 719         psz_parser++;
 720     }
 721
 722     if( *psz_parser == ':' )
 723     {
 724         /* read options */
 725         for( ;; )
 726         {
 727             *psz_parser++ = '\0';
 728
 729             if( !strncmp( psz_parser, "standard=", strlen( "standard=" ) ) )
 730             {
 731                 psz_parser += strlen( "standard=" );
 732                 size_t i;
 733                 for( i = 0; i < ARRAY_SIZE(psz_standards_list_text); i++ )
 734                 {
 735                     const char *psz_value = psz_standards_list_text[i];
 736                     size_t i_len = strlen( psz_value );
 737                     if( !strncasecmp( psz_parser, psz_value, i_len ) &&
 738                         ( psz_parser[i_len] == ':' || psz_parser[i_len] == 0 ) )
 739                     {
 740                         p_sys->i_selected_standard_id = i_standards_list[i];
 741                         psz_parser += i_len;
 742                         break;
 743                     }
 744                 }
 745
 746                 if( i == ARRAY_SIZE(psz_standards_list_text) )
 747                     p_sys->i_selected_standard_id = i_standards_list[strtol( psz_parser, &psz_parser, 0 )];
 748             }
 749             else if( !strncmp( psz_parser, "chroma=", strlen( "chroma=" ) ) )
 750             {
 751                 int  i_len;
 752
 753                 psz_parser += strlen( "chroma=" );
 754                 if( strchr( psz_parser, ':' ) )
 755                 {
 756                     i_len = strchr( psz_parser, ':' ) - psz_parser;
 757                 }
 758                 else
 759                 {
 760                     i_len = strlen( psz_parser );
 761                 }
 762
 763                 free( p_sys->psz_requested_chroma );
 764                 p_sys->psz_requested_chroma = strndup( psz_parser, i_len );
 765
 766                 psz_parser += i_len;
 767             }
 768             else if( !strncmp( psz_parser, "input=", strlen( "input=" ) ) )
 769             {
 770                 p_sys->i_selected_input = strtol( psz_parser + strlen( "input=" ),
 771                                        &psz_parser, 0 );
 772             }
 773             else if( !strncmp( psz_parser, "audio-input=", strlen( "audio-input=" ) ) )
 774             {
 775                 p_sys->i_selected_audio_input = strtol( psz_parser + strlen( "audio-input=" ),
 776                                        &psz_parser, 0 );
 777             }
 778             else if( !strncmp( psz_parser, "fps=", strlen( "fps=" ) ) )
 779             {
 780                 p_sys->f_fps = us_strtof( psz_parser + strlen( "fps=" ),
 781                                           &psz_parser );
 782             }
 783             else if( !strncmp( psz_parser, "io=", strlen( "io=" ) ) )
 784             {
 785                 psz_parser += strlen( "io=" );
 786                 if( !strncmp( psz_parser, "read", strlen( "read" ) ) )
 787                 {
 788                     p_sys->io = IO_METHOD_READ;
 789                     psz_parser += strlen( "read" );
 790                 }
 791                 else if( !strncmp( psz_parser, "mmap", strlen( "mmap" ) ) )
 792                 {
 793                     p_sys->io = IO_METHOD_MMAP;
 794                     psz_parser += strlen( "mmap" );
 795                 }
 796                 else if( !strncmp( psz_parser, "userptr", strlen( "userptr" ) ) )
 797                 {
 798                     p_sys->io = IO_METHOD_USERPTR;
 799                     psz_parser += strlen( "userptr" );
 800                 }
 801                 else if( !strncmp( psz_parser, "auto", strlen( "auto" ) ) )
 802                 {
 803                     p_sys->io = IO_METHOD_AUTO;
 804                     psz_parser += strlen( "auto" );
 805                 }
 806                 else
 807                 {
 808                     p_sys->io = strtol( psz_parser, &psz_parser, 0 );
 809                 }
 810             }
 811             else if( !strncmp( psz_parser, "width=",
 812                                strlen( "width=" ) ) )
 813             {
 814                 p_sys->i_width =
 815                     strtol( psz_parser + strlen( "width=" ),
 816                             &psz_parser, 0 );
 817             }
 818             else if( !strncmp( psz_parser, "height=",
 819                                strlen( "height=" ) ) )
 820             {
 821                 p_sys->i_height =
 822                     strtol( psz_parser + strlen( "height=" ),
 823                             &psz_parser, 0 );
 824             }
 825             else if( !strncmp( psz_parser, "aspect-ratio=",
 826                                strlen( "aspect-ratio=" ) ) )
 827             {
 828                 unsigned int num,den;
 829                 num = strtol( psz_parser + strlen( "aspect-ratio=" ),
 830                               &psz_parser, 0 );
 831                 den = strtol( psz_parser + strlen( ":" ),
 832                               &psz_parser, 0 );
 833                 if( num && den )
 834                     p_sys->i_aspect = num * VOUT_ASPECT_FACTOR / den;
 835             }
 836             else if( !strncmp( psz_parser, "controls-reset",
 837                                strlen( "controls-reset" ) ) )
 838             {
 839                 var_SetBool( p_obj, "v4l2-controls-reset", true );
 840                 psz_parser += strlen( "controls-reset" );
 841             }
 842 #if 0
 843             else if( !strncmp( psz_parser, "brightness=",
 844                                strlen( "brightness=" ) ) )
 845             {
 846                 var_SetInteger( p_obj, "brightness",
 847                     strtol( psz_parser + strlen( "brightness=" ),
 848                             &psz_parser, 0 ) );
 849             }
 850             else if( !strncmp( psz_parser, "contrast=",
 851                                strlen( "contrast=" ) ) )
 852             {
 853                 var_SetInteger( p_obj, "contrast",
 854                     strtol( psz_parser + strlen( "contrast=" ),
 855                             &psz_parser, 0 ) );
 856             }
 857             else if( !strncmp( psz_parser, "saturation=",
 858                                strlen( "saturation=" ) ) )
 859             {
 860                 var_SetInteger( p_obj, "saturation",
 861                     strtol( psz_parser + strlen( "saturation=" ),
 862                             &psz_parser, 0 ) );
 863             }
 864             else if( !strncmp( psz_parser, "hue=",
 865                                strlen( "hue=" ) ) )
 866             {
 867                 var_SetInteger( p_obj, "hue",
 868                     strtol( psz_parser + strlen( "hue=" ),
 869                             &psz_parser, 0 ) );
 870             }
 871             else if( !strncmp( psz_parser, "gamma=",
 872                                strlen( "gamma=" ) ) )
 873             {
 874                 var_SetInteger( p_obj, "gamma",
 875                     strtol( psz_parser + strlen( "gamma=" ),
 876                             &psz_parser, 0 ) );
 877             }
 878 #endif
 879             else if( !strncmp( psz_parser, "tuner=", strlen( "tuner=" ) ) )
 880             {
 881                 p_sys->i_cur_tuner = strtol( psz_parser + strlen( "tuner=" ),
 882                                          &psz_parser, 0 );
 883             }
 884             else if( !strncmp( psz_parser, "tuner-frequency=", strlen( "tuner-frequency=" ) ) )
 885             {
 886                 p_sys->i_frequency = strtol( psz_parser
 887                                           + strlen( "tuner-frequency=" ),
 888                                           &psz_parser, 0 );
 889             }
 890             else if( !strncmp( psz_parser, "tuner-audio-mode=", strlen( "tuner-audio-mode=" ) ) )
 891             {
 892                 p_sys->i_audio_mode = strtol( psz_parser
 893                                           + strlen( "tuner-audio-mode=" ),
 894                                           &psz_parser, 0 );
 895             }
 896             else if( !strncmp( psz_parser, "set-ctrls=", strlen( "set-ctrls=" )) )
 897             {
 898                 int  i_len;
 899
 900                 psz_parser += strlen( "set-ctrls=" );
 901                 if( strchr( psz_parser, ':' ) )
 902                 {
 903                     i_len = strchr( psz_parser, ':' ) - psz_parser;
 904                 }
 905                 else
 906                 {
 907                     i_len = strlen( psz_parser );
 908                 }
 909
 910                 p_sys->psz_set_ctrls = strndup( psz_parser, i_len );
 911
 912                 psz_parser += i_len;
 913             }
 914             else if( !strncmp( psz_parser, "adev=", strlen( "adev=" ) )
 915              || !strncmp( psz_parser, "samplerate=", strlen( "samplerate=" ) )
 916              || !strncmp( psz_parser, "audio-method", strlen( "audio-method" ) )
 917              || !strncmp( psz_parser, "stereo", strlen( "stereo" ) )
 918              || !strncmp( psz_parser, "mono", strlen( "mono" ) ) )
 919             {
 920                 if( strchr( psz_parser, ':' ) )
 921                 {
 922                     psz_parser = strchr( psz_parser, ':' );
 923                 }
 924                 else
 925                 {
 926                     psz_parser += strlen( psz_parser );
 927                 }
 928
 929                 msg_Err( p_obj, AUDIO_DEPRECATED_ERROR );
 930             }
 931             else
 932             {
 933                 char *psz_unk = strchr( psz_parser, ':' );
 934                 if (psz_unk)
 935                     psz_unk = strndup( psz_parser, psz_unk - psz_parser );
 936                 else
 937                     psz_unk = strdup( psz_parser);
 938                 msg_Warn( p_obj, "unknown option %s", psz_unk );
 939                 free (psz_unk);
 940             }
 941
 942             while( *psz_parser && *psz_parser != ':' )
 943             {
 944                 psz_parser++;
 945             }
 946
 947             if( *psz_parser == '\0' )
 948             {
 949                 break;
 950             }
 951         }
 952     }
 953
 954     /* Main device */
 955     if( *psz_dup )
 956     {
 957         free( p_sys->psz_device );
 958         p_sys->psz_device = strdup( psz_dup );
 959     }
 960     else if( p_sys->psz_device == NULL )
 961         p_sys->psz_device = strdup( V4L2_DEFAULT );
 962     free( psz_dup );
 963 }
 964
 965 /*****************************************************************************
 966  * Close: close device, free resources
 967  *****************************************************************************/
 968 static void AccessClose( vlc_object_t *p_this )
 969 {
 970     access_t    *p_access = (access_t *)p_this;
 971     demux_sys_t *p_sys   = (demux_sys_t *) p_access->p_sys;
 972
 973     CommonClose( p_this, p_sys );
 974 }
 975
 976 static void DemuxClose( vlc_object_t *p_this )
 977 {
 978     struct v4l2_buffer buf;
 979     enum v4l2_buf_type buf_type;
 980     unsigned int i;
 981
 982     demux_t     *p_demux = (demux_t *)p_this;
 983     demux_sys_t *p_sys   = p_demux->p_sys;
 984
 985     /* Stop video capture */
 986     if( p_sys->i_fd >= 0 )
 987     {
 988         switch( p_sys->io )
 989         {
 990         case IO_METHOD_READ:
 991             /* Nothing to do */
 992             break;
 993
 994         case IO_METHOD_MMAP:
 995         case IO_METHOD_USERPTR:
 996             /* Some drivers 'hang' internally if this is not done before streamoff */
 997             for( unsigned int i = 0; i < p_sys->i_nbuffers; i++ )
 998             {
 999                 memset( &buf, 0, sizeof(buf) );
1000                 buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1001                 buf.memory = ( p_sys->io == IO_METHOD_USERPTR ) ?
1002                     V4L2_MEMORY_USERPTR : V4L2_MEMORY_MMAP;
1003                 v4l2_ioctl( p_sys->i_fd, VIDIOC_DQBUF, &buf ); /* ignore result */
1004             }
1005
1006             buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1007             if( v4l2_ioctl( p_sys->i_fd, VIDIOC_STREAMOFF, &buf_type ) < 0 ) {
1008                 msg_Err( p_this, "VIDIOC_STREAMOFF failed" );
1009             }
1010
1011             break;
1012
1013         default:
1014             break;
1015         }
1016     }
1017
1018     /* Free Video Buffers */
1019     if( p_sys->p_buffers ) {
1020         switch( p_sys->io )
1021         {
1022         case IO_METHOD_READ:
1023             free( p_sys->p_buffers[0].start );
1024             break;
1025
1026         case IO_METHOD_MMAP:
1027             for( i = 0; i < p_sys->i_nbuffers; ++i )
1028             {
1029                 if( v4l2_munmap( p_sys->p_buffers[i].start, p_sys->p_buffers[i].length ) )
1030                 {
1031                     msg_Err( p_this, "munmap failed" );
1032                 }
1033             }
1034             break;
1035
1036         case IO_METHOD_USERPTR:
1037             for( i = 0; i < p_sys->i_nbuffers; ++i )
1038             {
1039                free( p_sys->p_buffers[i].start );
1040             }
1041             break;
1042
1043         default:
1044             break;
1045         }
1046         free( p_sys->p_buffers );
1047     }
1048
1049     CommonClose( p_this, p_sys );
1050 }
1051
1052 static void CommonClose( vlc_object_t *p_this, demux_sys_t *p_sys )
1053 {
1054     (void)p_this;
1055     /* Close */
1056     if( p_sys->i_fd >= 0 ) v4l2_close( p_sys->i_fd );
1057     free( p_sys->psz_device );
1058     free( p_sys->p_standards );
1059     free( p_sys->p_inputs );
1060     free( p_sys->p_tuners );
1061     free( p_sys->p_codecs );
1062     free( p_sys->psz_requested_chroma );
1063     free( p_sys->psz_set_ctrls );
1064
1065     free( p_sys );
1066 }
1067
1068 /*****************************************************************************
1069  * AccessOpen: opens v4l2 device, access callback
1070  *****************************************************************************
1071  *
1072  * url: <video device>::::
1073  *
1074  *****************************************************************************/
1075 static int AccessOpen( vlc_object_t * p_this )
1076 {
1077     access_t *p_access = (access_t*) p_this;
1078     demux_sys_t * p_sys;
1079
1080     /* Only when selected */
1081     if( *p_access->psz_access == '\0' ) return VLC_EGENERIC;
1082
1083     access_InitFields( p_access );
1084     p_sys = calloc( 1, sizeof( demux_sys_t ));
1085     if( !p_sys ) return VLC_ENOMEM;
1086     p_access->p_sys = (access_sys_t*)p_sys;
1087
1088     GetV4L2Params( p_sys, (vlc_object_t *) p_access );
1089
1090     ParseMRL( p_sys, p_access->psz_location, (vlc_object_t *) p_access );
1091
1092 #ifdef HAVE_LIBV4L2
1093     if( !var_InheritBool( p_this, CFG_PREFIX "use-libv4l2" ) )
1094     {
1095         msg_Dbg( p_this, "Trying direct kernel v4l2" );
1096         p_sys->b_libv4l2 = false;
1097         if( FindMainDevice( p_this, p_sys, false ) == VLC_SUCCESS)
1098         {
1099             if( p_sys->io == IO_METHOD_READ )
1100             {
1101                 ACCESS_SET_CALLBACKS( AccessReadStream, NULL, AccessControl, NULL );
1102             }
1103             else
1104             {
1105                 ACCESS_SET_CALLBACKS( NULL, AccessRead, AccessControl, NULL );
1106             }
1107             return VLC_SUCCESS;
1108         }
1109     }
1110
1111     msg_Dbg( p_this, "Trying libv4l2 wrapper" );
1112     p_sys->b_libv4l2 = true;
1113 #endif
1114     if( FindMainDevice( p_this, p_sys, false ) == VLC_SUCCESS )
1115     {
1116         if( p_sys->io == IO_METHOD_READ )
1117         {
1118             ACCESS_SET_CALLBACKS( AccessReadStream, NULL, AccessControl, NULL );
1119         }
1120         else
1121         {
1122             ACCESS_SET_CALLBACKS( NULL, AccessRead, AccessControl, NULL );
1123         }
1124         return VLC_SUCCESS;
1125     }
1126
1127     AccessClose( p_this );
1128     return VLC_EGENERIC;
1129 }
1130
1131 /*****************************************************************************
1132  * DemuxControl:
1133  *****************************************************************************/
1134 static int DemuxControl( demux_t *p_demux, int i_query, va_list args )
1135 {
1136     switch( i_query )
1137     {
1138         /* Special for access_demux */
1139         case DEMUX_CAN_PAUSE:
1140         case DEMUX_CAN_SEEK:
1141         case DEMUX_CAN_CONTROL_PACE:
1142             *va_arg( args, bool * ) = false;
1143             return VLC_SUCCESS;
1144
1145         case DEMUX_GET_PTS_DELAY:
1146             *va_arg(args,int64_t *) = INT64_C(1000)
1147                 * var_InheritInteger( p_demux, "live-caching" );
1148             return VLC_SUCCESS;
1149
1150         case DEMUX_GET_TIME:
1151             *va_arg( args, int64_t * ) = mdate();
1152             return VLC_SUCCESS;
1153
1154         /* TODO implement others */
1155         default:
1156             return VLC_EGENERIC;
1157     }
1158
1159     return VLC_EGENERIC;
1160 }
1161
1162 /*****************************************************************************
1163  * AccessControl: access callback
1164  *****************************************************************************/
1165 static int AccessControl( access_t *p_access, int i_query, va_list args )
1166 {
1167     switch( i_query )
1168     {
1169         /* */
1170         case ACCESS_CAN_SEEK:
1171         case ACCESS_CAN_FASTSEEK:
1172         case ACCESS_CAN_PAUSE:
1173         case ACCESS_CAN_CONTROL_PACE:
1174             *va_arg( args, bool* ) = false;
1175             break;
1176
1177         /* */
1178         case ACCESS_GET_PTS_DELAY:
1179             *va_arg(args,int64_t *) = INT64_C(1000)
1180                 * var_InheritInteger( p_access, "live-caching" );
1181             break;
1182
1183         /* */
1184         case ACCESS_SET_PAUSE_STATE:
1185             /* Nothing to do */
1186             break;
1187
1188         case ACCESS_GET_TITLE_INFO:
1189         case ACCESS_SET_TITLE:
1190         case ACCESS_SET_SEEKPOINT:
1191         case ACCESS_SET_PRIVATE_ID_STATE:
1192         case ACCESS_GET_CONTENT_TYPE:
1193         case ACCESS_GET_META:
1194             return VLC_EGENERIC;
1195
1196         default:
1197             msg_Warn( p_access, "Unimplemented query in control(%d).", i_query);
1198             return VLC_EGENERIC;
1199
1200     }
1201     return VLC_SUCCESS;
1202 }
1203
1204 /*****************************************************************************
1205  * AccessRead: access callback
1206  ******************************************************************************/
1207 static block_t *AccessRead( access_t * p_access )
1208 {
1209     demux_sys_t *p_sys = (demux_sys_t *)p_access->p_sys;
1210
1211     struct pollfd fd;
1212     fd.fd = p_sys->i_fd;
1213     fd.events = POLLIN|POLLPRI;
1214     fd.revents = 0;
1215
1216     /* Wait for data */
1217     if( poll( &fd, 1, 500 ) > 0 ) /* Timeout after 0.5 seconds since I don't know if pf_demux can be blocking. */
1218         return GrabVideo( VLC_OBJECT(p_access), p_sys );
1219
1220     return NULL;
1221 }
1222
1223 static ssize_t AccessReadStream( access_t * p_access, uint8_t * p_buffer, size_t i_len )
1224 {
1225     demux_sys_t *p_sys = (demux_sys_t *) p_access->p_sys;
1226     struct pollfd ufd;
1227     int i_ret;
1228
1229     ufd.fd = p_sys->i_fd;
1230     ufd.events = POLLIN;
1231
1232     if( p_access->info.b_eof )
1233         return 0;
1234
1235     do
1236     {
1237         if( !vlc_object_alive (p_access) )
1238             return 0;
1239
1240         ufd.revents = 0;
1241     }
1242     while( ( i_ret = poll( &ufd, 1, 500 ) ) == 0 );
1243
1244     if( i_ret < 0 )
1245     {
1246         if( errno != EINTR )
1247             msg_Err( p_access, "poll error" );
1248         return -1;
1249     }
1250
1251     i_ret = v4l2_read( p_sys->i_fd, p_buffer, i_len );
1252     if( i_ret == 0 )
1253     {
1254         p_access->info.b_eof = true;
1255     }
1256     else if( i_ret > 0 )
1257     {
1258         p_access->info.i_pos += i_ret;
1259     }
1260
1261     return i_ret;
1262 }
1263
1264 /*****************************************************************************
1265  * Demux: Processes the audio or video frame
1266  *****************************************************************************/
1267 static int Demux( demux_t *p_demux )
1268 {
1269     demux_sys_t *p_sys = p_demux->p_sys;
1270
1271     struct pollfd fd;
1272     fd.fd = p_sys->i_fd;
1273     fd.events = POLLIN|POLLPRI;
1274     fd.revents = 0;
1275
1276     /* Wait for data */
1277     /* Timeout after 0.5 seconds since I don't know if pf_demux can be blocking. */
1278     while( poll( &fd, 1, 500 ) == -1 )
1279         if( errno != EINTR )
1280         {
1281             msg_Err( p_demux, "poll error: %m" );
1282             return -1;
1283         }
1284
1285     if( fd.revents )
1286     {
1287          block_t *p_block = GrabVideo( VLC_OBJECT(p_demux), p_sys );
1288          if( p_block )
1289          {
1290              es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
1291              es_out_Send( p_demux->out, p_sys->p_es, p_block );
1292         }
1293     }
1294
1295     return 1;
1296 }
1297
1298 /*****************************************************************************
1299  * GrabVideo: Grab a video frame
1300  *****************************************************************************/
1301 static block_t* GrabVideo( vlc_object_t *p_demux, demux_sys_t *p_sys )
1302 {
1303     block_t *p_block;
1304     struct v4l2_buffer buf;
1305     ssize_t i_ret;
1306
1307     /* Grab Video Frame */
1308     switch( p_sys->io )
1309     {
1310     case IO_METHOD_READ:
1311         i_ret = v4l2_read( p_sys->i_fd, p_sys->p_buffers[0].start, p_sys->p_buffers[0].length );
1312         if( i_ret == -1 )
1313         {
1314             switch( errno )
1315             {
1316             case EAGAIN:
1317                 return NULL;
1318             case EIO:
1319                 /* Could ignore EIO, see spec. */
1320                 /* fall through */
1321             default:
1322                 msg_Err( p_demux, "Failed to read frame" );
1323                 return 0;
1324                }
1325         }
1326
1327         p_block = ProcessVideoFrame( p_demux, (uint8_t*)p_sys->p_buffers[0].start, i_ret );
1328         if( !p_block )
1329             return NULL;
1330
1331         break;
1332
1333     case IO_METHOD_MMAP:
1334         memset( &buf, 0, sizeof(buf) );
1335         buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1336         buf.memory = V4L2_MEMORY_MMAP;
1337
1338         /* Wait for next frame */
1339         if (v4l2_ioctl( p_sys->i_fd, VIDIOC_DQBUF, &buf ) < 0 )
1340         {
1341             switch( errno )
1342             {
1343             case EAGAIN:
1344                 return NULL;
1345             case EIO:
1346                 /* Could ignore EIO, see spec. */
1347                 /* fall through */
1348             default:
1349                 msg_Err( p_demux, "Failed to wait (VIDIOC_DQBUF)" );
1350                 return NULL;
1351                }
1352         }
1353
1354         if( buf.index >= p_sys->i_nbuffers ) {
1355             msg_Err( p_demux, "Failed capturing new frame as i>=nbuffers" );
1356             return NULL;
1357         }
1358
1359         p_block = ProcessVideoFrame( p_demux, p_sys->p_buffers[buf.index].start, buf.bytesused );
1360         if( !p_block )
1361             return NULL;
1362
1363         /* Unlock */
1364         if( v4l2_ioctl( p_sys->i_fd, VIDIOC_QBUF, &buf ) < 0 )
1365         {
1366             msg_Err( p_demux, "Failed to unlock (VIDIOC_QBUF)" );
1367             block_Release( p_block );
1368             return NULL;
1369         }
1370
1371         break;
1372
1373     case IO_METHOD_USERPTR:
1374         memset( &buf, 0, sizeof(buf) );
1375         buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1376         buf.memory = V4L2_MEMORY_USERPTR;
1377
1378         /* Wait for next frame */
1379         if (v4l2_ioctl( p_sys->i_fd, VIDIOC_DQBUF, &buf ) < 0 )
1380         {
1381             switch( errno )
1382             {
1383             case EAGAIN:
1384                 return NULL;
1385             case EIO:
1386                 /* Could ignore EIO, see spec. */
1387                 /* fall through */
1388             default:
1389                 msg_Err( p_demux, "Failed to wait (VIDIOC_DQBUF)" );
1390                 return NULL;
1391             }
1392         }
1393
1394         /* Find frame? */
1395         unsigned int i;
1396         for( i = 0; i < p_sys->i_nbuffers; i++ )
1397         {
1398             if( buf.m.userptr == (unsigned long)p_sys->p_buffers[i].start &&
1399                 buf.length == p_sys->p_buffers[i].length ) break;
1400         }
1401
1402         if( i >= p_sys->i_nbuffers )
1403         {
1404             msg_Err( p_demux, "Failed capturing new frame as i>=nbuffers" );
1405             return NULL;
1406         }
1407
1408         p_block = ProcessVideoFrame( p_demux, (uint8_t*)buf.m.userptr, buf.bytesused );
1409         if( !p_block )
1410             return NULL;
1411
1412         /* Unlock */
1413         if( v4l2_ioctl( p_sys->i_fd, VIDIOC_QBUF, &buf ) < 0 )
1414         {
1415             msg_Err( p_demux, "Failed to unlock (VIDIOC_QBUF)" );
1416             block_Release( p_block );
1417             return NULL;
1418         }
1419
1420         break;
1421
1422     default:
1423         return NULL;
1424     }
1425
1426     /* Timestamp */
1427     p_block->i_pts = p_block->i_dts = mdate();
1428     p_block->i_flags |= p_sys->i_block_flags;
1429
1430     return p_block;
1431 }
1432
1433 /*****************************************************************************
1434  * ProcessVideoFrame: Helper function to take a buffer and copy it into
1435  * a new block
1436  *****************************************************************************/
1437 static block_t* ProcessVideoFrame( vlc_object_t *p_demux, uint8_t *p_frame, size_t i_size )
1438 {
1439     block_t *p_block;
1440
1441     if( !p_frame ) return NULL;
1442
1443     /* New block */
1444     if( !( p_block = block_New( p_demux, i_size ) ) )
1445     {
1446         msg_Warn( p_demux, "Cannot get new block" );
1447         return NULL;
1448     }
1449
1450     /* Copy frame */
1451     memcpy( p_block->p_buffer, p_frame, i_size );
1452
1453     return p_block;
1454 }
1455
1456 /*****************************************************************************
1457  * Helper function to initalise video IO using the Read method
1458  *****************************************************************************/
1459 static int InitRead( vlc_object_t *p_demux, demux_sys_t *p_sys, unsigned int i_buffer_size )
1460 {
1461     (void)p_demux;
1462
1463     p_sys->p_buffers = calloc( 1, sizeof( *p_sys->p_buffers ) );
1464     if( unlikely(p_sys->p_buffers == NULL) )
1465         return -1;
1466
1467     p_sys->p_buffers[0].length = i_buffer_size;
1468     p_sys->p_buffers[0].start = malloc( i_buffer_size );
1469     if( !p_sys->p_buffers[0].start )
1470         return -1;
1471
1472     return 0;
1473 }
1474
1475 /*****************************************************************************
1476  * Helper function to initalise video IO using the mmap method
1477  *****************************************************************************/
1478 static int InitMmap( vlc_object_t *p_demux, demux_sys_t *p_sys, int i_fd )
1479 {
1480     struct v4l2_requestbuffers req;
1481
1482     memset( &req, 0, sizeof(req) );
1483     req.count = 4;
1484     req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1485     req.memory = V4L2_MEMORY_MMAP;
1486
1487     if( v4l2_ioctl( i_fd, VIDIOC_REQBUFS, &req ) < 0 )
1488     {
1489         msg_Err( p_demux, "device does not support mmap I/O" );
1490         return -1;
1491     }
1492
1493     if( req.count < 2 )
1494     {
1495         msg_Err( p_demux, "insufficient buffers" );
1496         return -1;
1497     }
1498
1499     p_sys->p_buffers = calloc( req.count, sizeof( *p_sys->p_buffers ) );
1500     if( unlikely(!p_sys->p_buffers) )
1501         return -1;
1502
1503     for( p_sys->i_nbuffers = 0; p_sys->i_nbuffers < req.count; ++p_sys->i_nbuffers )
1504     {
1505         struct v4l2_buffer buf;
1506
1507         memset( &buf, 0, sizeof(buf) );
1508         buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1509         buf.memory = V4L2_MEMORY_MMAP;
1510         buf.index = p_sys->i_nbuffers;
1511
1512         if( v4l2_ioctl( i_fd, VIDIOC_QUERYBUF, &buf ) < 0 )
1513         {
1514             msg_Err( p_demux, "VIDIOC_QUERYBUF: %m" );
1515             return -1;
1516         }
1517
1518         p_sys->p_buffers[p_sys->i_nbuffers].length = buf.length;
1519         p_sys->p_buffers[p_sys->i_nbuffers].start =
1520             v4l2_mmap( NULL, buf.length, PROT_READ | PROT_WRITE, MAP_SHARED, i_fd, buf.m.offset );
1521
1522         if( p_sys->p_buffers[p_sys->i_nbuffers].start == MAP_FAILED )
1523         {
1524             msg_Err( p_demux, "mmap failed: %m" );
1525             return -1;
1526         }
1527     }
1528
1529     return 0;
1530 }
1531
1532 /*****************************************************************************
1533  * Helper function to initalise video IO using the userbuf method
1534  *****************************************************************************/
1535 static int InitUserP( vlc_object_t *p_demux, demux_sys_t *p_sys, int i_fd, unsigned int i_buffer_size )
1536 {
1537     struct v4l2_requestbuffers req;
1538     unsigned int i_page_size;
1539
1540     i_page_size = sysconf(_SC_PAGESIZE);
1541     i_buffer_size = ( i_buffer_size + i_page_size - 1 ) & ~( i_page_size - 1);
1542
1543     memset( &req, 0, sizeof(req) );
1544     req.count = 4;
1545     req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1546     req.memory = V4L2_MEMORY_USERPTR;
1547
1548     if( v4l2_ioctl( i_fd, VIDIOC_REQBUFS, &req ) < 0 )
1549     {
1550         msg_Err( p_demux, "device does not support user pointer i/o" );
1551         return -1;
1552     }
1553
1554     p_sys->p_buffers = calloc( 4, sizeof( *p_sys->p_buffers ) );
1555     if( !p_sys->p_buffers )
1556         return -1;
1557
1558     for( p_sys->i_nbuffers = 0; p_sys->i_nbuffers < 4; ++p_sys->i_nbuffers )
1559     {
1560         p_sys->p_buffers[p_sys->i_nbuffers].length = i_buffer_size;
1561         if( posix_memalign( &p_sys->p_buffers[p_sys->i_nbuffers].start,
1562                 /* boundary */ i_page_size, i_buffer_size ) )
1563             return -1;
1564     }
1565
1566     return 0;
1567 }
1568
1569 /*****************************************************************************
1570  * IsPixelFormatSupported: returns true if the specified V4L2 pixel format is
1571  * in the array of supported formats returned by the driver
1572  *****************************************************************************/
1573 static bool IsPixelFormatSupported( demux_t *p_demux, unsigned int i_pixelformat )
1574 {
1575     demux_sys_t *p_sys = p_demux->p_sys;
1576
1577     for( unsigned i_index = 0; i_index < p_sys->i_codec; i_index++ )
1578     {
1579         if( p_sys->p_codecs[i_index].pixelformat == i_pixelformat )
1580             return true;
1581     }
1582
1583     return false;
1584 }
1585
1586 static float GetMaxFrameRate( int i_fd, uint32_t i_pixel_format,
1587                               uint32_t i_width, uint32_t i_height )
1588 {
1589 #ifdef VIDIOC_ENUM_FRAMEINTERVALS
1590     /* This is new in Linux 2.6.19 */
1591     struct v4l2_frmivalenum frmival;
1592     memset( &frmival, 0, sizeof(frmival) );
1593     frmival.pixel_format = i_pixel_format;
1594     frmival.width = i_width;
1595     frmival.height = i_height;
1596     if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMEINTERVALS, &frmival ) >= 0 )
1597     {
1598         switch( frmival.type )
1599         {
1600             case V4L2_FRMIVAL_TYPE_DISCRETE:
1601             {
1602                 float f_fps_max = -1;
1603                 do
1604                 {
1605                     float f_fps = (float)frmival.discrete.denominator
1606                                 / (float)frmival.discrete.numerator;
1607                     if( f_fps > f_fps_max ) f_fps_max = f_fps;
1608                     frmival.index++;
1609                 } while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMEINTERVALS,
1610                                      &frmival ) >= 0 );
1611                 return f_fps_max;
1612             }
1613             case V4L2_FRMSIZE_TYPE_STEPWISE:
1614             case V4L2_FRMIVAL_TYPE_CONTINUOUS:
1615                 return __MAX( (float)frmival.stepwise.max.denominator
1616                             / (float)frmival.stepwise.max.numerator,
1617                               (float)frmival.stepwise.min.denominator
1618                             / (float)frmival.stepwise.min.numerator );
1619         }
1620     }
1621 #endif
1622     return -1.;
1623 }
1624
1625 static float GetAbsoluteMaxFrameRate( demux_t *p_demux, int i_fd,
1626                                       uint32_t i_pixel_format )
1627 {
1628     float f_fps_max = -1.;
1629 #ifdef VIDIOC_ENUM_FRAMESIZES
1630     /* This is new in Linux 2.6.19 */
1631     struct v4l2_frmsizeenum frmsize;
1632     memset( &frmsize, 0, sizeof(frmsize) );
1633     frmsize.pixel_format = i_pixel_format;
1634     if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES, &frmsize ) >= 0 )
1635     {
1636         switch( frmsize.type )
1637         {
1638             case V4L2_FRMSIZE_TYPE_DISCRETE:
1639                 do
1640                 {
1641                     frmsize.index++;
1642                     float f_fps = GetMaxFrameRate( i_fd, i_pixel_format,
1643                                                    frmsize.discrete.width,
1644                                                    frmsize.discrete.height );
1645                     if( f_fps > f_fps_max ) f_fps_max = f_fps;
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( i_fd, i_pixel_format,
1660                                                    i_width, i_height );
1661                     if( f_fps > f_fps_max ) f_fps_max = f_fps;
1662                 }
1663                 break;
1664             }
1665             case V4L2_FRMSIZE_TYPE_CONTINUOUS:
1666                 /* FIXME */
1667                 msg_Err( p_demux, "GetAbsoluteMaxFrameRate implementation for V4L2_FRMSIZE_TYPE_CONTINUOUS isn't correct" );
1668                  f_fps_max = GetMaxFrameRate( i_fd, i_pixel_format,
1669                                               frmsize.stepwise.max_width,
1670                                               frmsize.stepwise.max_height );
1671                 break;
1672         }
1673     }
1674 #endif
1675     return f_fps_max;
1676 }
1677
1678 static void GetMaxDimensions( demux_t *p_demux, int i_fd,
1679                               uint32_t i_pixel_format, float f_fps_min,
1680                               uint32_t *pi_width, uint32_t *pi_height )
1681 {
1682     *pi_width = 0;
1683     *pi_height = 0;
1684 #ifdef VIDIOC_ENUM_FRAMESIZES
1685     /* This is new in Linux 2.6.19 */
1686     struct v4l2_frmsizeenum frmsize;
1687     memset( &frmsize, 0, sizeof(frmsize) );
1688     frmsize.pixel_format = i_pixel_format;
1689     if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES, &frmsize ) >= 0 )
1690     {
1691         switch( frmsize.type )
1692         {
1693             case V4L2_FRMSIZE_TYPE_DISCRETE:
1694                 do
1695                 {
1696                     frmsize.index++;
1697                     float f_fps = GetMaxFrameRate( i_fd, i_pixel_format,
1698                                                    frmsize.discrete.width,
1699                                                    frmsize.discrete.height );
1700                     if( f_fps >= f_fps_min &&
1701                         frmsize.discrete.width > *pi_width )
1702                     {
1703                         *pi_width = frmsize.discrete.width;
1704                         *pi_height = frmsize.discrete.height;
1705                     }
1706                 } while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES,
1707                          &frmsize ) >= 0 );
1708                 break;
1709             case V4L2_FRMSIZE_TYPE_STEPWISE:
1710             {
1711                 uint32_t i_width = frmsize.stepwise.min_width;
1712                 uint32_t i_height = frmsize.stepwise.min_height;
1713                 for( ;
1714                      i_width <= frmsize.stepwise.max_width &&
1715                      i_height <= frmsize.stepwise.max_width;
1716                      i_width += frmsize.stepwise.step_width,
1717                      i_height += frmsize.stepwise.step_height )
1718                 {
1719                     float f_fps = GetMaxFrameRate( i_fd, i_pixel_format,
1720                                                    i_width, i_height );
1721                     if( f_fps >= f_fps_min && i_width > *pi_width )
1722                     {
1723                         *pi_width = i_width;
1724                         *pi_height = i_height;
1725                     }
1726                 }
1727                 break;
1728             }
1729             case V4L2_FRMSIZE_TYPE_CONTINUOUS:
1730                 /* FIXME */
1731                 msg_Err( p_demux, "GetMaxDimension implementation for V4L2_FRMSIZE_TYPE_CONTINUOUS isn't correct" );
1732                 float f_fps = GetMaxFrameRate( i_fd, i_pixel_format,
1733                                                frmsize.stepwise.max_width,
1734                                                frmsize.stepwise.max_height );
1735                 if( f_fps >= f_fps_min &&
1736                     frmsize.stepwise.max_width > *pi_width )
1737                 {
1738                     *pi_width = frmsize.stepwise.max_width;
1739                     *pi_height = frmsize.stepwise.max_height;
1740                 }
1741                 break;
1742         }
1743     }
1744 #endif
1745 }
1746
1747 /*****************************************************************************
1748  * OpenVideoDev: open and set up the video device and probe for capabilities
1749  *****************************************************************************/
1750 static int OpenVideoDev( vlc_object_t *p_obj, demux_sys_t *p_sys, bool b_demux )
1751 {
1752     struct v4l2_cropcap cropcap;
1753     struct v4l2_crop crop;
1754     struct v4l2_format fmt;
1755     unsigned int i_min;
1756     enum v4l2_buf_type buf_type;
1757     const char *psz_device = p_sys->psz_device;
1758     es_format_t es_fmt;
1759
1760     int i_fd = vlc_open( psz_device, O_RDWR );
1761     if( i_fd == -1 )
1762     {
1763         msg_Err( p_obj, "cannot open device %s: %m", psz_device );
1764         return -1;
1765     }
1766
1767 #ifdef HAVE_LIBV4L2
1768     /* Note the v4l2_xxx functions are designed so that if they get passed an
1769        unknown fd, the will behave exactly as their regular xxx counterparts,
1770        so if v4l2_fd_open fails, we continue as normal (missing the libv4l2
1771        custom cam format to normal formats conversion). Chances are big we will
1772        still fail then though, as normally v4l2_fd_open only fails if the
1773        device is not a v4l2 device. */
1774     if( p_sys->b_libv4l2 )
1775     {
1776         int libv4l2_fd;
1777         libv4l2_fd = v4l2_fd_open( i_fd, 0 );
1778         if( libv4l2_fd != -1 )
1779             i_fd = libv4l2_fd;
1780     }
1781 #endif
1782
1783     /* Select standard */
1784
1785     if( p_sys->i_selected_standard_id != V4L2_STD_UNKNOWN )
1786     {
1787         v4l2_std_id std = p_sys->i_selected_standard_id;
1788         if( v4l2_ioctl( i_fd, VIDIOC_S_STD, &std ) < 0
1789          || v4l2_ioctl( i_fd, VIDIOC_G_STD, &std ) < 0 )
1790         {
1791             msg_Err( p_obj, "cannot set standard 0x%"PRIx64": %m", std );
1792             goto error;
1793         }
1794         msg_Dbg( p_obj, "standard set to 0x%"PRIx64":", std );
1795         p_sys->i_selected_standard_id = std;
1796         for( unsigned i = 0; i < p_sys->i_standard; i++)
1797             if( p_sys->p_standards[i].id & std )
1798                 msg_Dbg( p_obj, "  %s", p_sys->p_standards[i].name );
1799     }
1800
1801     /* Tune the tuner */
1802     if( p_sys->i_frequency >= 0 )
1803     {
1804         if( p_sys->i_cur_tuner >= p_sys->i_tuner )
1805         {
1806             msg_Err( p_obj, "invalid tuner %"PRIu32, p_sys->i_cur_tuner );
1807             goto error;
1808         }
1809         struct v4l2_frequency frequency;
1810         memset( &frequency, 0, sizeof( frequency ) );
1811         frequency.tuner = p_sys->i_cur_tuner;
1812         frequency.type = p_sys->p_tuners[p_sys->i_cur_tuner].type;
1813         frequency.frequency = p_sys->i_frequency / 62.5;
1814         if( v4l2_ioctl( i_fd, VIDIOC_S_FREQUENCY, &frequency ) < 0 )
1815         {
1816             msg_Err( p_obj, "cannot set tuner frequency: %m" );
1817             goto error;
1818         }
1819         msg_Dbg( p_obj, "tuner frequency set" );
1820     }
1821
1822     /* Set the tuner's audio mode */
1823     if( p_sys->i_audio_mode >= 0 )
1824     {
1825         if( p_sys->i_cur_tuner >= p_sys->i_tuner )
1826         {
1827             msg_Err( p_obj, "invalid tuner %"PRIu32, p_sys->i_cur_tuner );
1828             goto error;
1829         }
1830         struct v4l2_tuner tuner;
1831         memset( &tuner, 0, sizeof( tuner ) );
1832         tuner.index = p_sys->i_cur_tuner;
1833         tuner.audmode = p_sys->i_audio_mode;
1834         if( v4l2_ioctl( i_fd, VIDIOC_S_TUNER, &tuner ) < 0 )
1835         {
1836             msg_Err( p_obj, "cannot set tuner audio mode: %m" );
1837             goto error;
1838         }
1839         msg_Dbg( p_obj, "tuner audio mode set" );
1840     }
1841
1842     /* Select input */
1843
1844     if( p_sys->i_selected_input >= p_sys->i_input )
1845     {
1846         msg_Warn( p_obj, "invalid input: using default instead" );
1847         p_sys->i_selected_input = 0;
1848     }
1849
1850     if( v4l2_ioctl( i_fd, VIDIOC_S_INPUT, &p_sys->i_selected_input ) < 0 )
1851     {
1852         msg_Err( p_obj, "cannot set input %u: %m", p_sys->i_selected_input );
1853         goto error;
1854     }
1855     msg_Dbg( p_obj, "input set to %u", p_sys->i_selected_input );
1856
1857     /* Set audio input */
1858
1859     if( p_sys->i_audio > 0 )
1860     {
1861         if( p_sys->i_selected_audio_input >= p_sys->i_audio )
1862         {
1863             msg_Warn( p_obj, "invalid audio input: using default instead" );
1864             p_sys->i_selected_audio_input = 0;
1865         }
1866
1867         if( v4l2_ioctl( i_fd, VIDIOC_S_AUDIO,
1868                         &p_sys->p_audios[p_sys->i_selected_audio_input] ) < 0 )
1869         {
1870             msg_Err( p_obj, "cannot set audio input %u: %m",
1871                      p_sys->i_selected_audio_input );
1872             goto error;
1873         }
1874         msg_Dbg( p_obj, "audio input set to %u",
1875                  p_sys->i_selected_audio_input );
1876     }
1877
1878
1879     /* TODO: Move the resolution stuff up here */
1880     /* if MPEG encoder card, no need to do anything else after this */
1881     ControlList( p_obj, i_fd, var_GetBool( p_obj, "v4l2-controls-reset" ),
1882                  b_demux );
1883     SetAvailControlsByString( p_obj, p_sys, i_fd );
1884
1885     /* Verify device support for the various IO methods */
1886     switch( p_sys->io )
1887     {
1888         case IO_METHOD_READ:
1889             if( !(p_sys->dev_cap.capabilities & V4L2_CAP_READWRITE) )
1890             {
1891                 msg_Err( p_obj, "device does not support read i/o" );
1892                 goto error;
1893             }
1894             msg_Dbg( p_obj, "using read I/O" );
1895             break;
1896
1897         case IO_METHOD_MMAP:
1898         case IO_METHOD_USERPTR:
1899             if( !(p_sys->dev_cap.capabilities & V4L2_CAP_STREAMING) )
1900             {
1901                 msg_Err( p_obj, "device does not support streaming I/O" );
1902                 goto error;
1903             }
1904             if( p_sys->io == IO_METHOD_MMAP )
1905                 msg_Dbg( p_obj, "using streaming I/O (mmap)" );
1906             else
1907                 msg_Dbg( p_obj, "using streaming I/O (userptr)" );
1908             break;
1909
1910         default:
1911             msg_Err( p_obj, "I/O method not supported" );
1912             goto error;
1913     }
1914
1915     /* Reset Cropping */
1916     memset( &cropcap, 0, sizeof(cropcap) );
1917     cropcap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1918     if( v4l2_ioctl( i_fd, VIDIOC_CROPCAP, &cropcap ) >= 0 )
1919     {
1920         crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1921         crop.c = cropcap.defrect; /* reset to default */
1922         if( crop.c.width > 0 && crop.c.height > 0 ) /* Fix for fm tuners */
1923         {
1924             if( v4l2_ioctl( i_fd, VIDIOC_S_CROP, &crop ) < 0 )
1925             {
1926                 switch( errno )
1927                 {
1928                     case EINVAL:
1929                         /* Cropping not supported. */
1930                         break;
1931                     default:
1932                         /* Errors ignored. */
1933                         break;
1934                 }
1935             }
1936         }
1937     }
1938
1939     /* Try and find default resolution if not specified */
1940     memset( &fmt, 0, sizeof(fmt) );
1941     fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1942
1943     if( p_sys->i_width <= 0 || p_sys->i_height <= 0 )
1944     {
1945         /* Use current width and height settings */
1946         if( v4l2_ioctl( i_fd, VIDIOC_G_FMT, &fmt ) < 0 )
1947         {
1948             msg_Err( p_obj, "cannot get default width and height: %m" );
1949             goto error;
1950         }
1951
1952         msg_Dbg( p_obj, "found default width and height of %ux%u",
1953                  fmt.fmt.pix.width, fmt.fmt.pix.height );
1954
1955         if( p_sys->i_width < 0 || p_sys->i_height < 0 )
1956         {
1957             msg_Dbg( p_obj, "will try to find optimal width and height" );
1958         }
1959     }
1960     else
1961     {
1962         /* Use user specified width and height */
1963         msg_Dbg( p_obj, "trying specified size %dx%d",
1964                  p_sys->i_width, p_sys->i_height );
1965         fmt.fmt.pix.width = p_sys->i_width;
1966         fmt.fmt.pix.height = p_sys->i_height;
1967     }
1968
1969     fmt.fmt.pix.field = V4L2_FIELD_NONE;
1970
1971     if (b_demux)
1972     {
1973         demux_t *p_demux = (demux_t *) p_obj;
1974
1975         /* Test and set Chroma */
1976         fmt.fmt.pix.pixelformat = 0;
1977         if( p_sys->psz_requested_chroma && *p_sys->psz_requested_chroma )
1978         {
1979             /* User specified chroma */
1980             const vlc_fourcc_t i_requested_fourcc =
1981                 vlc_fourcc_GetCodecFromString( VIDEO_ES, p_sys->psz_requested_chroma );
1982
1983             for( int i = 0; v4l2chroma_to_fourcc[i].i_v4l2 != 0; i++ )
1984             {
1985                 if( v4l2chroma_to_fourcc[i].i_fourcc == i_requested_fourcc )
1986                 {
1987                     fmt.fmt.pix.pixelformat = v4l2chroma_to_fourcc[i].i_v4l2;
1988                     break;
1989                 }
1990             }
1991             /* Try and set user chroma */
1992             bool b_error = !IsPixelFormatSupported( p_demux, fmt.fmt.pix.pixelformat );
1993             if( !b_error && fmt.fmt.pix.pixelformat )
1994             {
1995                 if( v4l2_ioctl( i_fd, VIDIOC_S_FMT, &fmt ) < 0 )
1996                 {
1997                     fmt.fmt.pix.field = V4L2_FIELD_ANY;
1998                     if( v4l2_ioctl( i_fd, VIDIOC_S_FMT, &fmt ) < 0 )
1999                     {
2000                         fmt.fmt.pix.field = V4L2_FIELD_NONE;
2001                         b_error = true;
2002                     }
2003                 }
2004             }
2005             if( b_error )
2006             {
2007                 msg_Warn( p_demux, "Driver is unable to use specified chroma %s. Trying defaults.", p_sys->psz_requested_chroma );
2008                 fmt.fmt.pix.pixelformat = 0;
2009             }
2010         }
2011
2012         /* If no user specified chroma, find best */
2013         /* This also decides if MPEG encoder card or not */
2014         if( !fmt.fmt.pix.pixelformat )
2015         {
2016             unsigned int i;
2017             for( i = 0; i < ARRAY_SIZE( p_chroma_fallbacks ); i++ )
2018             {
2019                 fmt.fmt.pix.pixelformat = p_chroma_fallbacks[i];
2020                 if( IsPixelFormatSupported( p_demux, fmt.fmt.pix.pixelformat ) )
2021                 {
2022                     if( v4l2_ioctl( i_fd, VIDIOC_S_FMT, &fmt ) >= 0 )
2023                         break;
2024                     fmt.fmt.pix.field = V4L2_FIELD_ANY;
2025                     if( v4l2_ioctl( i_fd, VIDIOC_S_FMT, &fmt ) >= 0 )
2026                         break;
2027                     fmt.fmt.pix.field = V4L2_FIELD_NONE;
2028                 }
2029             }
2030             if( i == ARRAY_SIZE( p_chroma_fallbacks ) )
2031             {
2032                 msg_Warn( p_demux, "Could not select any of the default chromas; attempting to open as MPEG encoder card (access)" );
2033                 goto error;
2034             }
2035         }
2036
2037         if( p_sys->i_width < 0 || p_sys->i_height < 0 )
2038         {
2039             if( p_sys->f_fps <= 0 )
2040             {
2041                 p_sys->f_fps = GetAbsoluteMaxFrameRate( p_demux, i_fd,
2042                                                         fmt.fmt.pix.pixelformat );
2043                 msg_Dbg( p_demux, "Found maximum framerate of %f", p_sys->f_fps );
2044             }
2045             uint32_t i_width, i_height;
2046             GetMaxDimensions( p_demux, i_fd,
2047                               fmt.fmt.pix.pixelformat, p_sys->f_fps,
2048                               &i_width, &i_height );
2049             if( i_width || i_height )
2050             {
2051                 msg_Dbg( p_demux, "Found optimal dimensions for framerate %f "
2052                                   "of %ux%u", p_sys->f_fps, i_width, i_height );
2053                 fmt.fmt.pix.width = i_width;
2054                 fmt.fmt.pix.height = i_height;
2055                 if( v4l2_ioctl( i_fd, VIDIOC_S_FMT, &fmt ) < 0 )
2056                 {
2057                     msg_Err( p_obj, "Cannot set size to optimal dimensions "
2058                                     "%ux%u", i_width, i_height );
2059                     goto error;
2060                 }
2061             }
2062             else
2063             {
2064                 msg_Warn( p_obj, "Could not find optimal width and height, "
2065                                  "falling back to driver default." );
2066             }
2067         }
2068     }
2069
2070     p_sys->i_width = fmt.fmt.pix.width;
2071     p_sys->i_height = fmt.fmt.pix.height;
2072
2073     if( v4l2_ioctl( i_fd, VIDIOC_G_FMT, &fmt ) < 0 ) {;}
2074     /* Print extra info */
2075     msg_Dbg( p_obj, "Driver requires at most %d bytes to store a complete image", fmt.fmt.pix.sizeimage );
2076     /* Check interlacing */
2077     switch( fmt.fmt.pix.field )
2078     {
2079         case V4L2_FIELD_NONE:
2080             msg_Dbg( p_obj, "Interlacing setting: progressive" );
2081             break;
2082         case V4L2_FIELD_TOP:
2083             msg_Dbg( p_obj, "Interlacing setting: top field only" );
2084             break;
2085         case V4L2_FIELD_BOTTOM:
2086             msg_Dbg( p_obj, "Interlacing setting: bottom field only" );
2087             break;
2088         case V4L2_FIELD_INTERLACED:
2089             msg_Dbg( p_obj, "Interlacing setting: interleaved (bottom top if M/NTSC, top bottom otherwise)" );
2090             if( p_sys->i_selected_standard_id == V4L2_STD_NTSC )
2091                 p_sys->i_block_flags = BLOCK_FLAG_BOTTOM_FIELD_FIRST;
2092             else
2093                 p_sys->i_block_flags = BLOCK_FLAG_TOP_FIELD_FIRST;
2094             break;
2095         case V4L2_FIELD_SEQ_TB:
2096             msg_Dbg( p_obj, "Interlacing setting: sequential top bottom (TODO)" );
2097             break;
2098         case V4L2_FIELD_SEQ_BT:
2099             msg_Dbg( p_obj, "Interlacing setting: sequential bottom top (TODO)" );
2100             break;
2101         case V4L2_FIELD_ALTERNATE:
2102             msg_Dbg( p_obj, "Interlacing setting: alternate fields (TODO)" );
2103             p_sys->i_height = p_sys->i_height * 2;
2104             break;
2105         case V4L2_FIELD_INTERLACED_TB:
2106             msg_Dbg( p_obj, "Interlacing setting: interleaved top bottom" );
2107             p_sys->i_block_flags = BLOCK_FLAG_TOP_FIELD_FIRST;
2108             break;
2109         case V4L2_FIELD_INTERLACED_BT:
2110             msg_Dbg( p_obj, "Interlacing setting: interleaved bottom top" );
2111             p_sys->i_block_flags = BLOCK_FLAG_BOTTOM_FIELD_FIRST;
2112             break;
2113         default:
2114             msg_Warn( p_obj, "Interlacing setting: unknown type (%d)",
2115                       fmt.fmt.pix.field );
2116             break;
2117     }
2118
2119     /* Look up final fourcc */
2120     p_sys->i_fourcc = 0;
2121     for( int i = 0; v4l2chroma_to_fourcc[i].i_fourcc != 0; i++ )
2122     {
2123         if( v4l2chroma_to_fourcc[i].i_v4l2 == fmt.fmt.pix.pixelformat )
2124         {
2125             p_sys->i_fourcc = v4l2chroma_to_fourcc[i].i_fourcc;
2126             es_format_Init( &es_fmt, VIDEO_ES, p_sys->i_fourcc );
2127             es_fmt.video.i_rmask = v4l2chroma_to_fourcc[i].i_rmask;
2128             es_fmt.video.i_gmask = v4l2chroma_to_fourcc[i].i_gmask;
2129             es_fmt.video.i_bmask = v4l2chroma_to_fourcc[i].i_bmask;
2130             break;
2131         }
2132     }
2133
2134     /* Buggy driver paranoia */
2135     i_min = fmt.fmt.pix.width * 2;
2136     if( fmt.fmt.pix.bytesperline < i_min )
2137         fmt.fmt.pix.bytesperline = i_min;
2138     i_min = fmt.fmt.pix.bytesperline * fmt.fmt.pix.height;
2139     if( fmt.fmt.pix.sizeimage < i_min )
2140         fmt.fmt.pix.sizeimage = i_min;
2141
2142 #ifdef VIDIOC_ENUM_FRAMEINTERVALS
2143     /* This is new in Linux 2.6.19 */
2144     /* List supported frame rates */
2145     struct v4l2_frmivalenum frmival;
2146     memset( &frmival, 0, sizeof(frmival) );
2147     frmival.pixel_format = fmt.fmt.pix.pixelformat;
2148     frmival.width = p_sys->i_width;
2149     frmival.height = p_sys->i_height;
2150     if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMEINTERVALS, &frmival ) >= 0 )
2151     {
2152         char psz_fourcc[5];
2153         memset( &psz_fourcc, 0, sizeof( psz_fourcc ) );
2154         vlc_fourcc_to_char( p_sys->i_fourcc, &psz_fourcc );
2155         msg_Dbg( p_obj, "supported frame intervals for %4.4s, %dx%d:",
2156                  psz_fourcc, frmival.width, frmival.height );
2157         switch( frmival.type )
2158         {
2159             case V4L2_FRMIVAL_TYPE_DISCRETE:
2160                 do
2161                 {
2162                     msg_Dbg( p_obj, "    supported frame interval: %d/%d",
2163                              frmival.discrete.numerator,
2164                              frmival.discrete.denominator );
2165                     frmival.index++;
2166                 } while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMEINTERVALS, &frmival ) >= 0 );
2167                 break;
2168             case V4L2_FRMIVAL_TYPE_STEPWISE:
2169                 msg_Dbg( p_obj, "    supported frame intervals: %d/%d to "
2170                          "%d/%d using %d/%d increments",
2171                          frmival.stepwise.min.numerator,
2172                          frmival.stepwise.min.denominator,
2173                          frmival.stepwise.max.numerator,
2174                          frmival.stepwise.max.denominator,
2175                          frmival.stepwise.step.numerator,
2176                          frmival.stepwise.step.denominator );
2177                 break;
2178             case V4L2_FRMIVAL_TYPE_CONTINUOUS:
2179                 msg_Dbg( p_obj, "    supported frame intervals: %d/%d to %d/%d",
2180                          frmival.stepwise.min.numerator,
2181                          frmival.stepwise.min.denominator,
2182                          frmival.stepwise.max.numerator,
2183                          frmival.stepwise.max.denominator );
2184                 break;
2185         }
2186     }
2187 #endif
2188
2189
2190     /* Init IO method */
2191     switch( p_sys->io )
2192     {
2193     case IO_METHOD_READ:
2194         if( b_demux && InitRead( p_obj, p_sys, fmt.fmt.pix.sizeimage ) )
2195             goto error;
2196         break;
2197
2198     case IO_METHOD_MMAP:
2199         if( InitMmap( p_obj, p_sys, i_fd ) )
2200             goto error;
2201         break;
2202
2203     case IO_METHOD_USERPTR:
2204         if( InitUserP( p_obj, p_sys, i_fd, fmt.fmt.pix.sizeimage ) )
2205             goto error;
2206         break;
2207     default:
2208         assert(0);
2209     }
2210
2211     if( b_demux )
2212     {
2213         /* Add */
2214         es_fmt.video.i_width  = p_sys->i_width;
2215         es_fmt.video.i_height = p_sys->i_height;
2216
2217         /* Get aspect-ratio */
2218         es_fmt.video.i_sar_num = p_sys->i_aspect    * es_fmt.video.i_height;
2219         es_fmt.video.i_sar_den = VOUT_ASPECT_FACTOR * es_fmt.video.i_width;
2220
2221         /* Framerate */
2222         es_fmt.video.i_frame_rate = p_sys->f_fps * INT64_C(1000000);
2223         es_fmt.video.i_frame_rate_base = INT64_C(1000000);
2224
2225         demux_t *p_demux = (demux_t *) p_obj;
2226         msg_Dbg( p_demux, "added new video es %4.4s %dx%d",
2227             (char*)&es_fmt.i_codec, es_fmt.video.i_width, es_fmt.video.i_height );
2228         p_sys->p_es = es_out_Add( p_demux->out, &es_fmt );
2229     }
2230
2231     /* Start Capture */
2232
2233     switch( p_sys->io )
2234     {
2235     case IO_METHOD_READ:
2236         /* Nothing to do */
2237         break;
2238
2239     case IO_METHOD_MMAP:
2240         for (unsigned int i = 0; i < p_sys->i_nbuffers; ++i)
2241         {
2242             struct v4l2_buffer buf;
2243
2244             memset( &buf, 0, sizeof(buf) );
2245             buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2246             buf.memory = V4L2_MEMORY_MMAP;
2247             buf.index = i;
2248
2249             if( v4l2_ioctl( i_fd, VIDIOC_QBUF, &buf ) < 0 )
2250             {
2251                 msg_Err( p_obj, "VIDIOC_QBUF failed" );
2252                 goto error;
2253             }
2254         }
2255
2256         buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2257         if( v4l2_ioctl( i_fd, VIDIOC_STREAMON, &buf_type ) < 0 )
2258         {
2259             msg_Err( p_obj, "VIDIOC_STREAMON failed" );
2260             goto error;
2261         }
2262
2263         break;
2264
2265     case IO_METHOD_USERPTR:
2266         for( unsigned int i = 0; i < p_sys->i_nbuffers; ++i )
2267         {
2268             struct v4l2_buffer buf;
2269
2270             memset( &buf, 0, sizeof(buf) );
2271             buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2272             buf.memory = V4L2_MEMORY_USERPTR;
2273             buf.index = i;
2274             buf.m.userptr = (unsigned long)p_sys->p_buffers[i].start;
2275             buf.length = p_sys->p_buffers[i].length;
2276
2277             if( v4l2_ioctl( i_fd, VIDIOC_QBUF, &buf ) < 0 )
2278             {
2279                 msg_Err( p_obj, "VIDIOC_QBUF failed" );
2280                 goto error;
2281             }
2282         }
2283
2284         buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2285         if( v4l2_ioctl( i_fd, VIDIOC_STREAMON, &buf_type ) < 0 )
2286         {
2287             msg_Err( p_obj, "VIDIOC_STREAMON failed" );
2288             goto error;
2289         }
2290         break;
2291     default:
2292         assert(0);
2293     }
2294
2295     /* report fps */
2296     if( p_sys->f_fps >= 0.1 )
2297     {
2298         msg_Dbg( p_obj, "User set fps=%f", p_sys->f_fps );
2299     }
2300
2301     return i_fd;
2302
2303 error:
2304     v4l2_close( i_fd );
2305     return -1;
2306 }
2307
2308 /*****************************************************************************
2309  * ProbeVideoDev: probe video for capabilities
2310  *****************************************************************************/
2311 static bool ProbeVideoDev( vlc_object_t *p_obj, demux_sys_t *p_sys,
2312                                  const char *psz_device )
2313 {
2314     int i_fd = vlc_open( psz_device, O_RDWR );
2315     if( i_fd == -1 )
2316     {
2317         msg_Err( p_obj, "cannot open video device %s: %m", psz_device );
2318         return -1;
2319     }
2320
2321 #ifdef HAVE_LIBV4L2
2322     /* Note the v4l2_xxx functions are designed so that if they get passed an
2323        unknown fd, the will behave exactly as their regular xxx counterparts,
2324        so if v4l2_fd_open fails, we continue as normal (missing the libv4l2
2325        custom cam format to normal formats conversion). Chances are big we will
2326        still fail then though, as normally v4l2_fd_open only fails if the
2327        device is not a v4l2 device. */
2328     if( p_sys->b_libv4l2 )
2329     {
2330         int libv4l2_fd;
2331         libv4l2_fd = v4l2_fd_open( i_fd, 0 );
2332         if( libv4l2_fd != -1 )
2333             i_fd = libv4l2_fd;
2334     }
2335 #endif
2336
2337     /* Get device capabilites */
2338
2339     if( v4l2_ioctl( i_fd, VIDIOC_QUERYCAP, &p_sys->dev_cap ) < 0 )
2340     {
2341         msg_Err( p_obj, "cannot get video capabilities: %m" );
2342         goto error;
2343     }
2344
2345     msg_Dbg( p_obj, "V4L2 device: %s using driver: %s (version: %u.%u.%u) on %s",
2346                             p_sys->dev_cap.card,
2347                             p_sys->dev_cap.driver,
2348                             (p_sys->dev_cap.version >> 16) & 0xFF,
2349                             (p_sys->dev_cap.version >> 8) & 0xFF,
2350                             p_sys->dev_cap.version & 0xFF,
2351                             p_sys->dev_cap.bus_info );
2352
2353     msg_Dbg( p_obj, "the device has the capabilities: (%c) Video Capture, "
2354                                                        "(%c) Audio, "
2355                                                        "(%c) Tuner, "
2356                                                        "(%c) Radio",
2357              ( p_sys->dev_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE  ? 'X':' '),
2358              ( p_sys->dev_cap.capabilities & V4L2_CAP_AUDIO  ? 'X':' '),
2359              ( p_sys->dev_cap.capabilities & V4L2_CAP_TUNER  ? 'X':' '),
2360              ( p_sys->dev_cap.capabilities & V4L2_CAP_RADIO  ? 'X':' ') );
2361
2362     msg_Dbg( p_obj, "supported I/O methods are: (%c) Read/Write, "
2363                                                  "(%c) Streaming, "
2364                                                  "(%c) Asynchronous",
2365             ( p_sys->dev_cap.capabilities & V4L2_CAP_READWRITE ? 'X':' ' ),
2366             ( p_sys->dev_cap.capabilities & V4L2_CAP_STREAMING ? 'X':' ' ),
2367             ( p_sys->dev_cap.capabilities & V4L2_CAP_ASYNCIO ? 'X':' ' ) );
2368
2369     if( p_sys->io == IO_METHOD_AUTO )
2370     {
2371         if( p_sys->dev_cap.capabilities & V4L2_CAP_STREAMING )
2372             p_sys->io = IO_METHOD_MMAP;
2373         else if( p_sys->dev_cap.capabilities & V4L2_CAP_READWRITE )
2374             p_sys->io = IO_METHOD_READ;
2375         else
2376             msg_Err( p_obj, "No known I/O method supported" );
2377     }
2378
2379     if( p_sys->dev_cap.capabilities & V4L2_CAP_RDS_CAPTURE )
2380         msg_Dbg( p_obj, "device supports RDS" );
2381
2382 #ifdef V4L2_CAP_HW_FREQ_SEEK
2383     if( p_sys->dev_cap.capabilities & V4L2_CAP_HW_FREQ_SEEK )
2384         msg_Dbg( p_obj, "device supports hardware frequency seeking" );
2385 #endif
2386     if( p_sys->dev_cap.capabilities & V4L2_CAP_VBI_CAPTURE )
2387         msg_Dbg( p_obj, "device supports raw VBI capture" );
2388
2389     if( p_sys->dev_cap.capabilities & V4L2_CAP_SLICED_VBI_CAPTURE )
2390         msg_Dbg( p_obj, "device supports sliced VBI capture" );
2391
2392     /* Now, enumerate all the video inputs. This is useless at the moment
2393        since we have no way to present that info to the user except with
2394        debug messages */
2395
2396     if( p_sys->dev_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE )
2397     {
2398         struct v4l2_input t_input;
2399         memset( &t_input, 0, sizeof(t_input) );
2400         p_sys->i_input = 0;
2401         while( v4l2_ioctl( i_fd, VIDIOC_ENUMINPUT, &t_input ) >= 0 )
2402         {
2403             if( t_input.index != p_sys->i_input )
2404                 break;
2405             p_sys->i_input++;
2406             t_input.index = p_sys->i_input;
2407         }
2408
2409         free( p_sys->p_inputs );
2410         p_sys->p_inputs = calloc( 1, p_sys->i_input * sizeof( struct v4l2_input ) );
2411         if( !p_sys->p_inputs ) goto error;
2412
2413         for( unsigned i_index = 0; i_index < p_sys->i_input; i_index++ )
2414         {
2415             p_sys->p_inputs[i_index].index = i_index;
2416
2417             if( v4l2_ioctl( i_fd, VIDIOC_ENUMINPUT, &p_sys->p_inputs[i_index] ) )
2418             {
2419                 msg_Err( p_obj, "cannot get video input characteristics: %m" );
2420                 goto error;
2421             }
2422             msg_Dbg( p_obj, "video input %u (%s) has type: %s %c",
2423                                 i_index,
2424                                 p_sys->p_inputs[i_index].name,
2425                                 p_sys->p_inputs[i_index].type
2426                                         == V4L2_INPUT_TYPE_TUNER ?
2427                                         "Tuner adapter" :
2428                                         "External analog input",
2429                                 i_index == p_sys->i_selected_input ? '*' : ' ' );
2430         }
2431     }
2432
2433     /* Probe video standards */
2434     if( p_sys->dev_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE )
2435     {
2436         struct v4l2_standard t_standards;
2437         t_standards.index = 0;
2438         p_sys->i_standard = 0;
2439         while( v4l2_ioctl( i_fd, VIDIOC_ENUMSTD, &t_standards ) >=0 )
2440         {
2441             if( t_standards.index != p_sys->i_standard )
2442                 break;
2443             p_sys->i_standard++;
2444             t_standards.index = p_sys->i_standard;
2445         }
2446
2447         free( p_sys->p_standards );
2448         p_sys->p_standards = calloc( 1, p_sys->i_standard * sizeof( struct v4l2_standard ) );
2449         if( !p_sys->p_standards ) goto error;
2450
2451         for( unsigned i_standard = 0; i_standard < p_sys->i_standard; i_standard++ )
2452         {
2453             p_sys->p_standards[i_standard].index = i_standard;
2454
2455             if( v4l2_ioctl( i_fd, VIDIOC_ENUMSTD, &p_sys->p_standards[i_standard] ) )
2456             {
2457                 msg_Err( p_obj, "cannot get video input standards: %m" );
2458                 goto error;
2459             }
2460             msg_Dbg( p_obj, "video standard %u is: %s %c",
2461                                 i_standard,
2462                                 p_sys->p_standards[i_standard].name,
2463                                 (p_sys->p_standards[i_standard].id & p_sys->i_selected_standard_id) ? '*' : ' ' );
2464         }
2465     }
2466
2467     /* initialize the structures for the ioctls */
2468     for( unsigned i_index = 0; i_index < 32; i_index++ )
2469     {
2470         p_sys->p_audios[i_index].index = i_index;
2471     }
2472
2473     /* Probe audio inputs */
2474     if( p_sys->dev_cap.capabilities & V4L2_CAP_AUDIO )
2475     {
2476         while( p_sys->i_audio < 32 &&
2477                v4l2_ioctl( i_fd, VIDIOC_S_AUDIO, &p_sys->p_audios[p_sys->i_audio] ) >= 0 )
2478         {
2479             if( v4l2_ioctl( i_fd, VIDIOC_G_AUDIO, &p_sys->p_audios[ p_sys->i_audio] ) < 0 )
2480             {
2481                 msg_Err( p_obj, "cannot get audio input characteristics: %m" );
2482                 goto error;
2483             }
2484
2485             msg_Dbg( p_obj, "audio input %u (%s) is %s %s %c",
2486                                 p_sys->i_audio,
2487                                 p_sys->p_audios[p_sys->i_audio].name,
2488                                 p_sys->p_audios[p_sys->i_audio].capability &
2489                                                     V4L2_AUDCAP_STEREO ?
2490                                         "Stereo" : "Mono",
2491                                 p_sys->p_audios[p_sys->i_audio].capability &
2492                                                     V4L2_AUDCAP_AVL ?
2493                                     "(Automatic Volume Level supported)" : "",
2494                                 p_sys->i_audio == (unsigned)p_sys->i_selected_audio_input ? '*' : ' ' );
2495
2496             p_sys->i_audio++;
2497         }
2498     }
2499
2500     /* List tuner caps */
2501     if( p_sys->dev_cap.capabilities & V4L2_CAP_TUNER )
2502     {
2503         struct v4l2_tuner tuner;
2504         memset( &tuner, 0, sizeof(tuner) );
2505         p_sys->i_tuner = 0;
2506         while( v4l2_ioctl( i_fd, VIDIOC_G_TUNER, &tuner ) >= 0 )
2507         {
2508             if( tuner.index != p_sys->i_tuner )
2509                 break;
2510             p_sys->i_tuner++;
2511             memset( &tuner, 0, sizeof(tuner) );
2512             tuner.index = p_sys->i_tuner;
2513         }
2514
2515         free( p_sys->p_tuners );
2516         p_sys->p_tuners = calloc( 1, p_sys->i_tuner * sizeof( struct v4l2_tuner ) );
2517         if( !p_sys->p_tuners ) goto error;
2518
2519         for( unsigned i_index = 0; i_index < p_sys->i_tuner; i_index++ )
2520         {
2521             p_sys->p_tuners[i_index].index = i_index;
2522
2523             if( v4l2_ioctl( i_fd, VIDIOC_G_TUNER, &p_sys->p_tuners[i_index] ) )
2524             {
2525                 msg_Err( p_obj, "cannot get tuner characteristics: %m" );
2526                 goto error;
2527             }
2528             msg_Dbg( p_obj, "tuner %u (%s) has type: %s, "
2529                               "frequency range: %.1f %s -> %.1f %s",
2530                                 i_index,
2531                                 p_sys->p_tuners[i_index].name,
2532                                 p_sys->p_tuners[i_index].type
2533                                         == V4L2_TUNER_RADIO ?
2534                                         "Radio" : "Analog TV",
2535                                 p_sys->p_tuners[i_index].rangelow * 62.5,
2536                                 p_sys->p_tuners[i_index].capability &
2537                                         V4L2_TUNER_CAP_LOW ?
2538                                         "Hz" : "kHz",
2539                                 p_sys->p_tuners[i_index].rangehigh * 62.5,
2540                                 p_sys->p_tuners[i_index].capability &
2541                                         V4L2_TUNER_CAP_LOW ?
2542                                         "Hz" : "kHz" );
2543
2544             struct v4l2_frequency frequency;
2545             memset( &frequency, 0, sizeof( frequency ) );
2546             if( v4l2_ioctl( i_fd, VIDIOC_G_FREQUENCY, &frequency ) < 0 )
2547             {
2548                 msg_Err( p_obj, "cannot get tuner frequency: %m" );
2549                 goto error;
2550             }
2551             msg_Dbg( p_obj, "tuner %u (%s) frequency: %.1f %s",
2552                      i_index,
2553                      p_sys->p_tuners[i_index].name,
2554                      frequency.frequency * 62.5,
2555                      p_sys->p_tuners[i_index].capability &
2556                              V4L2_TUNER_CAP_LOW ?
2557                              "Hz" : "kHz" );
2558         }
2559     }
2560
2561     /* Probe for available chromas */
2562     if( p_sys->dev_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE )
2563     {
2564         struct v4l2_fmtdesc codec;
2565
2566         unsigned i_index = 0;
2567         memset( &codec, 0, sizeof(codec) );
2568         codec.index = i_index;
2569         codec.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2570
2571         while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FMT, &codec ) >= 0 )
2572         {
2573             if( codec.index != i_index )
2574                 break;
2575             i_index++;
2576             codec.index = i_index;
2577         }
2578
2579         p_sys->i_codec = i_index;
2580
2581         free( p_sys->p_codecs );
2582         p_sys->p_codecs = calloc( 1, p_sys->i_codec * sizeof( struct v4l2_fmtdesc ) );
2583
2584         for( i_index = 0; i_index < p_sys->i_codec; i_index++ )
2585         {
2586             p_sys->p_codecs[i_index].index = i_index;
2587             p_sys->p_codecs[i_index].type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2588
2589             if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FMT, &p_sys->p_codecs[i_index] ) < 0 )
2590             {
2591                 msg_Err( p_obj, "cannot get codec description: %m" );
2592                 goto error;
2593             }
2594
2595             /* only print if vlc supports the format */
2596             char psz_fourcc_v4l2[5];
2597             memset( &psz_fourcc_v4l2, 0, sizeof( psz_fourcc_v4l2 ) );
2598             vlc_fourcc_to_char( p_sys->p_codecs[i_index].pixelformat,
2599                                 &psz_fourcc_v4l2 );
2600             bool b_codec_supported = false;
2601             for( int i = 0; v4l2chroma_to_fourcc[i].i_v4l2 != 0; i++ )
2602             {
2603                 if( v4l2chroma_to_fourcc[i].i_v4l2 == p_sys->p_codecs[i_index].pixelformat )
2604                 {
2605                     b_codec_supported = true;
2606
2607                     char psz_fourcc[5];
2608                     memset( &psz_fourcc, 0, sizeof( psz_fourcc ) );
2609                     vlc_fourcc_to_char( v4l2chroma_to_fourcc[i].i_fourcc,
2610                                         &psz_fourcc );
2611                     msg_Dbg( p_obj, "device supports chroma %4.4s [%s, %s]",
2612                                 psz_fourcc,
2613                                 p_sys->p_codecs[i_index].description,
2614                                 psz_fourcc_v4l2 );
2615
2616 #ifdef VIDIOC_ENUM_FRAMESIZES
2617                     /* This is new in Linux 2.6.19 */
2618                     /* List valid frame sizes for this format */
2619                     struct v4l2_frmsizeenum frmsize;
2620                     memset( &frmsize, 0, sizeof(frmsize) );
2621                     frmsize.pixel_format = p_sys->p_codecs[i_index].pixelformat;
2622                     if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES, &frmsize ) < 0 )
2623                     {
2624                         /* Not all devices support this ioctl */
2625                         msg_Warn( p_obj, "Unable to query for frame sizes" );
2626                     }
2627                     else
2628                     {
2629                         switch( frmsize.type )
2630                         {
2631                             case V4L2_FRMSIZE_TYPE_DISCRETE:
2632                                 do
2633                                 {
2634                                     msg_Dbg( p_obj,
2635                 "    device supports size %dx%d",
2636                 frmsize.discrete.width, frmsize.discrete.height );
2637                                     frmsize.index++;
2638                                 } while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES, &frmsize ) >= 0 );
2639                                 break;
2640                             case V4L2_FRMSIZE_TYPE_STEPWISE:
2641                                 msg_Dbg( p_obj,
2642                 "    device supports sizes %dx%d to %dx%d using %dx%d increments",
2643                 frmsize.stepwise.min_width, frmsize.stepwise.min_height,
2644                 frmsize.stepwise.max_width, frmsize.stepwise.max_height,
2645                 frmsize.stepwise.step_width, frmsize.stepwise.step_height );
2646                                 break;
2647                             case V4L2_FRMSIZE_TYPE_CONTINUOUS:
2648                                 msg_Dbg( p_obj,
2649                 "    device supports all sizes %dx%d to %dx%d",
2650                 frmsize.stepwise.min_width, frmsize.stepwise.min_height,
2651                 frmsize.stepwise.max_width, frmsize.stepwise.max_height );
2652                                 break;
2653                         }
2654                     }
2655 #endif
2656                 }
2657             }
2658             if( !b_codec_supported )
2659             {
2660                     msg_Dbg( p_obj,
2661                          "device codec %4.4s (%s) not supported",
2662                          psz_fourcc_v4l2,
2663                          p_sys->p_codecs[i_index].description );
2664             }
2665         }
2666     }
2667     v4l2_close( i_fd );
2668     return true;
2669
2670 error:
2671     v4l2_close( i_fd );
2672     return false;
2673
2674 }
2675
2676 static void name2var( unsigned char *name )
2677 {
2678     for( ; *name; name++ )
2679         *name = (*name == ' ') ? '_' : tolower( *name );
2680 }
2681
2682 /*****************************************************************************
2683  * Print a user-class v4l2 control's details, create the relevant variable,
2684  * change the value if needed.
2685  *****************************************************************************/
2686 static void ControlListPrint( vlc_object_t *p_obj, int i_fd,
2687                               struct v4l2_queryctrl queryctrl,
2688                               bool b_reset, bool b_demux )
2689 {
2690     struct v4l2_querymenu querymenu;
2691     unsigned int i_mid;
2692
2693     int i;
2694     int i_val;
2695
2696     char *psz_name;
2697     vlc_value_t val, val2;
2698
2699     if( queryctrl.flags & V4L2_CTRL_FLAG_GRABBED )
2700         msg_Dbg( p_obj, "    control is busy" );
2701     if( queryctrl.flags & V4L2_CTRL_FLAG_READ_ONLY )
2702         msg_Dbg( p_obj, "    control is read-only" );
2703
2704     for( i = 0; controls[i].psz_name != NULL; i++ )
2705         if( controls[i].i_cid == queryctrl.id ) break;
2706
2707     if( controls[i].psz_name )
2708     {
2709         psz_name = strdup( controls[i].psz_name );
2710         char psz_cfg_name[40];
2711         sprintf( psz_cfg_name, CFG_PREFIX "%s", psz_name );
2712         i_val = var_CreateGetInteger( p_obj, psz_cfg_name );
2713         var_Destroy( p_obj, psz_cfg_name );
2714     }
2715     else
2716     {
2717         psz_name = strdup( (const char *)queryctrl.name );
2718         name2var( (unsigned char *)psz_name );
2719         i_val = -1;
2720     }
2721
2722     switch( queryctrl.type )
2723     {
2724         case V4L2_CTRL_TYPE_INTEGER:
2725             msg_Dbg( p_obj, "    integer control" );
2726             msg_Dbg( p_obj,
2727                      "    valid values: %d to %d by steps of %d",
2728                      queryctrl.minimum, queryctrl.maximum,
2729                      queryctrl.step );
2730
2731             var_Create( p_obj, psz_name,
2732                         VLC_VAR_INTEGER | VLC_VAR_HASMIN | VLC_VAR_HASMAX
2733                       | VLC_VAR_HASSTEP | VLC_VAR_ISCOMMAND );
2734             val.i_int = queryctrl.minimum;
2735             var_Change( p_obj, psz_name, VLC_VAR_SETMIN, &val, NULL );
2736             val.i_int = queryctrl.maximum;
2737             var_Change( p_obj, psz_name, VLC_VAR_SETMAX, &val, NULL );
2738             val.i_int = queryctrl.step;
2739             var_Change( p_obj, psz_name, VLC_VAR_SETSTEP, &val, NULL );
2740             break;
2741         case V4L2_CTRL_TYPE_BOOLEAN:
2742             msg_Dbg( p_obj, "    boolean control" );
2743             var_Create( p_obj, psz_name,
2744                         VLC_VAR_BOOL | VLC_VAR_ISCOMMAND );
2745             break;
2746         case V4L2_CTRL_TYPE_MENU:
2747             msg_Dbg( p_obj, "    menu control" );
2748             var_Create( p_obj, psz_name,
2749                         VLC_VAR_INTEGER | VLC_VAR_HASCHOICE
2750                       | VLC_VAR_ISCOMMAND );
2751             memset( &querymenu, 0, sizeof( querymenu ) );
2752             for( i_mid = queryctrl.minimum;
2753                  i_mid <= (unsigned)queryctrl.maximum;
2754                  i_mid++ )
2755             {
2756                 querymenu.index = i_mid;
2757                 querymenu.id = queryctrl.id;
2758                 if( v4l2_ioctl( i_fd, VIDIOC_QUERYMENU, &querymenu ) >= 0 )
2759                 {
2760                     msg_Dbg( p_obj, "        %d: %s",
2761                              querymenu.index, querymenu.name );
2762                     val.i_int = querymenu.index;
2763                     val2.psz_string = (char *)querymenu.name;
2764                     var_Change( p_obj, psz_name,
2765                                 VLC_VAR_ADDCHOICE, &val, &val2 );
2766                 }
2767             }
2768             break;
2769         case V4L2_CTRL_TYPE_BUTTON:
2770             msg_Dbg( p_obj, "    button control" );
2771             var_Create( p_obj, psz_name,
2772                         VLC_VAR_VOID | VLC_VAR_ISCOMMAND );
2773             break;
2774         case V4L2_CTRL_TYPE_CTRL_CLASS:
2775             msg_Dbg( p_obj, "    control class" );
2776             var_Create( p_obj, psz_name, VLC_VAR_VOID );
2777             break;
2778         default:
2779             msg_Dbg( p_obj, "    unknown control type (FIXME)" );
2780             /* FIXME */
2781             break;
2782     }
2783
2784     switch( queryctrl.type )
2785     {
2786         case V4L2_CTRL_TYPE_INTEGER:
2787         case V4L2_CTRL_TYPE_BOOLEAN:
2788         case V4L2_CTRL_TYPE_MENU:
2789             {
2790                 struct v4l2_control control;
2791                 msg_Dbg( p_obj, "    default value: %d",
2792                          queryctrl.default_value );
2793                 memset( &control, 0, sizeof( control ) );
2794                 control.id = queryctrl.id;
2795                 if( v4l2_ioctl( i_fd, VIDIOC_G_CTRL, &control ) >= 0 )
2796                 {
2797                     msg_Dbg( p_obj, "    current value: %d", control.value );
2798                 }
2799                 if( i_val == -1 )
2800                 {
2801                     i_val = control.value;
2802                     if( b_reset && queryctrl.default_value != control.value )
2803                     {
2804                         msg_Dbg( p_obj, "    reset value to default" );
2805                         Control( p_obj, i_fd, psz_name,
2806                                  queryctrl.id, queryctrl.default_value );
2807                     }
2808                 }
2809                 else
2810                 {
2811                     Control( p_obj, i_fd, psz_name, queryctrl.id, i_val );
2812                 }
2813             }
2814             break;
2815         default:
2816             break;
2817     }
2818
2819     val.psz_string = (char *)queryctrl.name;
2820     var_Change( p_obj, psz_name, VLC_VAR_SETTEXT, &val, NULL );
2821     val.i_int = queryctrl.id;
2822     val2.psz_string = (char *)psz_name;
2823     var_Change( p_obj, "allcontrols", VLC_VAR_ADDCHOICE, &val, &val2 );
2824     /* bad things happen changing MPEG mid-stream
2825      * so don't add to Ext Settings GUI */
2826     if( V4L2_CTRL_ID2CLASS( queryctrl.id ) != V4L2_CTRL_CLASS_MPEG )
2827         var_Change( p_obj, "controls", VLC_VAR_ADDCHOICE, &val, &val2 );
2828
2829     switch( var_Type( p_obj, psz_name ) & VLC_VAR_TYPE )
2830     {
2831         case VLC_VAR_BOOL:
2832             var_SetBool( p_obj, psz_name, i_val );
2833             break;
2834         case VLC_VAR_INTEGER:
2835             var_SetInteger( p_obj, psz_name, i_val );
2836             break;
2837         case VLC_VAR_VOID:
2838             break;
2839         default:
2840             msg_Warn( p_obj, "FIXME: %s %s %d", __FILE__, __func__,
2841                       __LINE__ );
2842             break;
2843     }
2844
2845     if( b_demux )
2846         var_AddCallback( p_obj, psz_name,
2847                         DemuxControlCallback, (void*)(intptr_t)queryctrl.id );
2848     else
2849         var_AddCallback( p_obj, psz_name,
2850                         AccessControlCallback, (void*)(intptr_t)queryctrl.id );
2851
2852     free( psz_name );
2853 }
2854
2855 /*****************************************************************************
2856  * List all user-class v4l2 controls, set them to the user specified
2857  * value and create the relevant variables to enable runtime changes
2858  *****************************************************************************/
2859 static int ControlList( vlc_object_t *p_obj, int i_fd, bool b_reset,
2860                         bool b_demux )
2861 {
2862     struct v4l2_queryctrl queryctrl;
2863     int i_cid;
2864
2865     memset( &queryctrl, 0, sizeof( queryctrl ) );
2866
2867     /* A list of available controls (aka the variable name) will be
2868      * stored as choices in the "allcontrols" variable. We'll thus be able
2869      * to use those to create an appropriate interface
2870      * A list of available controls that can be changed mid-stream will
2871      * be stored in the "controls" variable */
2872     var_Create( p_obj, "controls", VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
2873     var_Create( p_obj, "allcontrols", VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
2874
2875     var_Create( p_obj, "controls-update", VLC_VAR_VOID | VLC_VAR_ISCOMMAND );
2876
2877     /* Add a control to reset all controls to their default values */
2878     vlc_value_t val, val2;
2879     var_Create( p_obj, "controls-reset", VLC_VAR_VOID | VLC_VAR_ISCOMMAND );
2880     val.psz_string = _( "Reset controls to default" );
2881     var_Change( p_obj, "controls-reset", VLC_VAR_SETTEXT, &val, NULL );
2882     val.i_int = -1;
2883     val2.psz_string = (char *)"controls-reset";
2884     var_Change( p_obj, "controls", VLC_VAR_ADDCHOICE, &val, &val2 );
2885     if (b_demux)
2886         var_AddCallback( p_obj, "controls-reset", DemuxControlResetCallback, NULL );
2887     else
2888         var_AddCallback( p_obj, "controls-reset", AccessControlResetCallback, NULL );
2889
2890     queryctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
2891     if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2892     {
2893         msg_Dbg( p_obj, "Extended control API supported by v4l2 driver" );
2894
2895         /* List extended controls */
2896         queryctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
2897         while( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2898         {
2899             if( queryctrl.type == V4L2_CTRL_TYPE_CTRL_CLASS )
2900             {
2901                 msg_Dbg( p_obj, "%s", queryctrl.name );
2902                 queryctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
2903                 continue;
2904             }
2905             switch( V4L2_CTRL_ID2CLASS( queryctrl.id ) )
2906             {
2907                 case V4L2_CTRL_CLASS_USER:
2908                     msg_Dbg( p_obj, "Available control: %s (%x)",
2909                              queryctrl.name, queryctrl.id );
2910                     break;
2911                 case V4L2_CTRL_CLASS_MPEG:
2912                     name2var( queryctrl.name );
2913                     msg_Dbg( p_obj, "Available MPEG control: %s (%x)",
2914                              queryctrl.name, queryctrl.id );
2915                     break;
2916                 default:
2917                     msg_Dbg( p_obj, "Available private control: %s (%x)",
2918                              queryctrl.name, queryctrl.id );
2919                     break;
2920             }
2921             ControlListPrint( p_obj, i_fd, queryctrl, b_reset, b_demux );
2922             queryctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
2923         }
2924     }
2925     else
2926     {
2927         msg_Dbg( p_obj, "Extended control API not supported by v4l2 driver" );
2928
2929         /* List public controls */
2930         for( i_cid = V4L2_CID_BASE;
2931              i_cid < V4L2_CID_LASTP1;
2932              i_cid ++ )
2933         {
2934             queryctrl.id = i_cid;
2935             if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2936             {
2937                 if( queryctrl.flags & V4L2_CTRL_FLAG_DISABLED )
2938                     continue;
2939                 msg_Dbg( p_obj, "Available control: %s (%x)",
2940                          queryctrl.name, queryctrl.id );
2941                 ControlListPrint( p_obj, i_fd, queryctrl, b_reset, b_demux );
2942             }
2943         }
2944
2945         /* List private controls */
2946         for( i_cid = V4L2_CID_PRIVATE_BASE;
2947              ;
2948              i_cid ++ )
2949         {
2950             queryctrl.id = i_cid;
2951             if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2952             {
2953                 if( queryctrl.flags & V4L2_CTRL_FLAG_DISABLED )
2954                     continue;
2955                 msg_Dbg( p_obj, "Available private control: %s (%x)",
2956                          queryctrl.name, queryctrl.id );
2957                 ControlListPrint( p_obj, i_fd, queryctrl, b_reset, b_demux );
2958             }
2959             else
2960                 break;
2961         }
2962     }
2963
2964     return VLC_SUCCESS;
2965 }
2966
2967 static void SetAvailControlsByString( vlc_object_t *p_obj, demux_sys_t *p_sys,
2968                                       int i_fd )
2969 {
2970     char *psz_parser = p_sys->psz_set_ctrls;
2971     vlc_value_t val, text, name;
2972
2973     if( psz_parser == NULL )
2974         return;
2975
2976     if( *psz_parser == '{' )
2977         psz_parser++;
2978
2979     int i_ret = var_Change( p_obj, "allcontrols", VLC_VAR_GETCHOICES,
2980                             &val, &text );
2981     if( i_ret < 0 )
2982     {
2983         msg_Err( p_obj, "Oops, can't find 'allcontrols' variable." );
2984         return;
2985     }
2986
2987     while( *psz_parser && *psz_parser != '}' )
2988     {
2989         char *psz_delim, *psz_assign;
2990
2991         while( *psz_parser == ',' || *psz_parser == ' ' )
2992             psz_parser++;
2993
2994         psz_delim = strchr( psz_parser, ',' );
2995         if( psz_delim == NULL )
2996             psz_delim = strchr( psz_parser, '}' );
2997         if( psz_delim == NULL )
2998             psz_delim = psz_parser + strlen( psz_parser );
2999
3000         psz_assign = memchr( psz_parser, '=', psz_delim - psz_parser );
3001         if( psz_assign == NULL )
3002         {
3003             char *psz_name = strndup( psz_parser, psz_delim - psz_parser );
3004             msg_Err( p_obj, "%s missing '='", psz_name );
3005             free( psz_name );
3006             psz_parser = psz_delim + 1;
3007             continue;
3008         }
3009
3010         for( int i = 0;
3011              i < val.p_list->i_count ;//&& psz_parser < psz_assign;
3012              i++ )
3013         {
3014             const char *psz_var = text.p_list->p_values[i].psz_string;
3015             int i_cid = val.p_list->p_values[i].i_int;
3016             var_Change( p_obj, psz_var, VLC_VAR_GETTEXT, &name, NULL );
3017             const char *psz_name = name.psz_string;
3018
3019             int i_availstrlen = strlen( psz_name );
3020             int i_parsestrlen = psz_assign - psz_parser;
3021             int i_maxstrlen = __MAX( i_availstrlen, i_parsestrlen);
3022
3023             if( !strncasecmp( psz_name, psz_parser, i_maxstrlen ) )
3024             {
3025                 Control( p_obj, i_fd, psz_name, i_cid,
3026                          strtol( ++psz_assign, &psz_parser, 0) );
3027             }
3028             free( name.psz_string );
3029         }
3030
3031         if( psz_parser < psz_assign )
3032         {
3033             char *psz_name = strndup( psz_parser, psz_assign - psz_parser );
3034             msg_Err( p_obj, "Control %s not available", psz_name );
3035             free( psz_name );
3036             psz_parser = ( *psz_delim ) ? ( psz_delim + 1 ) : psz_delim;
3037         }
3038     }
3039     var_FreeList( &val, &text );
3040 }
3041
3042 /*****************************************************************************
3043  * Reset all user-class v4l2 controls to their default value
3044  *****************************************************************************/
3045 static int ControlReset( vlc_object_t *p_obj, int i_fd )
3046 {
3047     struct v4l2_queryctrl queryctrl;
3048     int i_cid;
3049     memset( &queryctrl, 0, sizeof( queryctrl ) );
3050
3051     queryctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
3052     if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
3053     {
3054         /* Extended control API supported */
3055         queryctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
3056         while( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
3057         {
3058             if( queryctrl.type == V4L2_CTRL_TYPE_CTRL_CLASS
3059              || V4L2_CTRL_ID2CLASS( queryctrl.id ) == V4L2_CTRL_CLASS_MPEG )
3060             {
3061                 queryctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
3062                 continue;
3063             }
3064             struct v4l2_control control;
3065             memset( &control, 0, sizeof( control ) );
3066             control.id = queryctrl.id;
3067             if( v4l2_ioctl( i_fd, VIDIOC_G_CTRL, &control ) >= 0
3068              && queryctrl.default_value != control.value )
3069             {
3070                 int i;
3071                 for( i = 0; controls[i].psz_name != NULL; i++ )
3072                     if( controls[i].i_cid == queryctrl.id ) break;
3073                 name2var( queryctrl.name );
3074                 Control( p_obj, i_fd,
3075                          controls[i].psz_name ? controls[i].psz_name
3076                           : (const char *)queryctrl.name,
3077                          queryctrl.id, queryctrl.default_value );
3078             }
3079             queryctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
3080         }
3081     }
3082     else
3083     {
3084
3085         /* public controls */
3086         for( i_cid = V4L2_CID_BASE;
3087              i_cid < V4L2_CID_LASTP1;
3088              i_cid ++ )
3089         {
3090             queryctrl.id = i_cid;
3091             if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
3092             {
3093                 struct v4l2_control control;
3094                 if( queryctrl.flags & V4L2_CTRL_FLAG_DISABLED )
3095                     continue;
3096                 memset( &control, 0, sizeof( control ) );
3097                 control.id = queryctrl.id;
3098                 if( v4l2_ioctl( i_fd, VIDIOC_G_CTRL, &control ) >= 0
3099                  && queryctrl.default_value != control.value )
3100                 {
3101                     int i;
3102                     for( i = 0; controls[i].psz_name != NULL; i++ )
3103                         if( controls[i].i_cid == queryctrl.id ) break;
3104                     name2var( queryctrl.name );
3105                     Control( p_obj, i_fd,
3106                              controls[i].psz_name ? controls[i].psz_name
3107                               : (const char *)queryctrl.name,
3108                              queryctrl.id, queryctrl.default_value );
3109                 }
3110             }
3111         }
3112
3113         /* private controls */
3114         for( i_cid = V4L2_CID_PRIVATE_BASE;
3115              ;
3116              i_cid ++ )
3117         {
3118             queryctrl.id = i_cid;
3119             if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
3120             {
3121                 struct v4l2_control control;
3122                 if( queryctrl.flags & V4L2_CTRL_FLAG_DISABLED )
3123                     continue;
3124                 memset( &control, 0, sizeof( control ) );
3125                 control.id = queryctrl.id;
3126                 if( v4l2_ioctl( i_fd, VIDIOC_G_CTRL, &control ) >= 0
3127                  && queryctrl.default_value != control.value )
3128                 {
3129                     name2var( queryctrl.name );
3130                     Control( p_obj, i_fd, (const char *)queryctrl.name,
3131                              queryctrl.id, queryctrl.default_value );
3132                 }
3133             }
3134             else
3135                 break;
3136         }
3137     }
3138     return VLC_SUCCESS;
3139 }
3140
3141 /*****************************************************************************
3142  * Issue user-class v4l2 controls
3143  *****************************************************************************/
3144 static int Control( vlc_object_t *p_obj, int i_fd,
3145                     const char *psz_name, int i_cid, int i_value )
3146 {
3147     struct v4l2_queryctrl queryctrl;
3148     struct v4l2_control control;
3149     struct v4l2_ext_control ext_control;
3150     struct v4l2_ext_controls ext_controls;
3151
3152     if( i_value == -1 )
3153         return VLC_SUCCESS;
3154
3155     memset( &queryctrl, 0, sizeof( queryctrl ) );
3156
3157     queryctrl.id = i_cid;
3158
3159     if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) < 0
3160         || queryctrl.flags & V4L2_CTRL_FLAG_DISABLED )
3161     {
3162         msg_Dbg( p_obj, "%s (%x) control is not supported.", psz_name, i_cid );
3163         return VLC_EGENERIC;
3164     }
3165
3166     memset( &control, 0, sizeof( control ) );
3167     memset( &ext_control, 0, sizeof( ext_control ) );
3168     memset( &ext_controls, 0, sizeof( ext_controls ) );
3169     control.id = i_cid;
3170     ext_control.id = i_cid;
3171     ext_controls.ctrl_class = V4L2_CTRL_ID2CLASS( i_cid );
3172     ext_controls.count = 1;
3173     ext_controls.controls = &ext_control;
3174
3175     int i_ret = -1;
3176
3177     if( i_value >= queryctrl.minimum && i_value <= queryctrl.maximum )
3178     {
3179         ext_control.value = i_value;
3180         if( v4l2_ioctl( i_fd, VIDIOC_S_EXT_CTRLS, &ext_controls ) < 0 )
3181         {
3182             control.value = i_value;
3183             if( v4l2_ioctl( i_fd, VIDIOC_S_CTRL, &control ) < 0 )
3184             {
3185                 msg_Err( p_obj, "unable to set %s (%x) to %d (%m)",
3186                          psz_name, i_cid, i_value );
3187                 return VLC_EGENERIC;
3188             }
3189             i_ret = v4l2_ioctl( i_fd, VIDIOC_G_CTRL, &control );
3190         }
3191         else
3192         {
3193             i_ret = v4l2_ioctl( i_fd, VIDIOC_G_EXT_CTRLS, &ext_controls );
3194             control.value = ext_control.value;
3195         }
3196     }
3197
3198     if( i_ret >= 0 )
3199     {
3200         vlc_value_t val;
3201         msg_Dbg( p_obj, "video %s: %d", psz_name, control.value );
3202         switch( var_Type( p_obj, psz_name ) & VLC_VAR_TYPE )
3203         {
3204             case VLC_VAR_BOOL:
3205                 val.b_bool = control.value;
3206                 var_Change( p_obj, psz_name, VLC_VAR_SETVALUE, &val, NULL );
3207                 var_TriggerCallback( p_obj, "controls-update" );
3208                 break;
3209             case VLC_VAR_INTEGER:
3210                 val.i_int = control.value;
3211                 var_Change( p_obj, psz_name, VLC_VAR_SETVALUE, &val, NULL );
3212                 var_TriggerCallback( p_obj, "controls-update" );
3213                 break;
3214         }
3215     }
3216     return VLC_SUCCESS;
3217 }
3218
3219 /*****************************************************************************
3220  * On the fly change settings callback
3221  *****************************************************************************/
3222 static int DemuxControlCallback( vlc_object_t *p_this,
3223     const char *psz_var, vlc_value_t oldval, vlc_value_t newval,
3224     void *p_data )
3225 {
3226     (void)oldval;
3227     demux_t *p_demux = (demux_t*)p_this;
3228     demux_sys_t *p_sys = p_demux->p_sys;
3229     int i_cid = (long int)p_data;
3230
3231     int i_fd = p_sys->i_fd;
3232
3233     if( i_fd < 0 )
3234         return VLC_EGENERIC;
3235
3236     Control( p_this, i_fd, psz_var, i_cid, newval.i_int );
3237
3238     return VLC_EGENERIC;
3239 }
3240
3241 static int DemuxControlResetCallback( vlc_object_t *p_this,
3242     const char *psz_var, vlc_value_t oldval, vlc_value_t newval, void *p_data )
3243 {
3244     (void)psz_var;    (void)oldval;    (void)newval;    (void)p_data;
3245     demux_t *p_demux = (demux_t*)p_this;
3246     demux_sys_t *p_sys = p_demux->p_sys;
3247
3248     int i_fd = p_sys->i_fd;
3249
3250     if( i_fd < 0 )
3251         return VLC_EGENERIC;
3252
3253     ControlReset( p_this, i_fd );
3254
3255     return VLC_EGENERIC;
3256 }
3257
3258 static int AccessControlCallback( vlc_object_t *p_this,
3259     const char *psz_var, vlc_value_t oldval, vlc_value_t newval,
3260     void *p_data )
3261 {
3262     (void)oldval;
3263     access_t *p_access = (access_t *)p_this;
3264     demux_sys_t *p_sys = (demux_sys_t *) p_access->p_sys;
3265     int i_cid = (long int)p_data;
3266
3267     int i_fd = p_sys->i_fd;
3268
3269     if( i_fd < 0 )
3270         return VLC_EGENERIC;
3271
3272     Control( p_this, i_fd, psz_var, i_cid, newval.i_int );
3273
3274     return VLC_EGENERIC;
3275 }
3276
3277 static int AccessControlResetCallback( vlc_object_t *p_this,
3278     const char *psz_var, vlc_value_t oldval, vlc_value_t newval, void *p_data )
3279 {
3280     (void)psz_var;     (void)oldval;     (void)newval;     (void)p_data;
3281     access_t *p_access = (access_t *)p_this;
3282     demux_sys_t *p_sys = (demux_sys_t *) p_access->p_sys;
3283
3284     int i_fd = p_sys->i_fd;
3285
3286     if( i_fd < 0 )
3287         return VLC_EGENERIC;
3288
3289     ControlReset( p_this, i_fd );
3290
3291     return VLC_EGENERIC;
3292 }