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

   1 /*****************************************************************************
   2  * v4l2.c : Video4Linux2 input module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2002-2009 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Benjamin Pracht <bigben at videolan dot org>
   8  *          Richard Hosking <richard at hovis dot net>
   9  *          Antoine Cellerier <dionoea at videolan d.t org>
  10  *          Dennis Lou <dlou99 at yahoo dot com>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  25  *****************************************************************************/
  26
  27 /*
  28  * Sections based on the reference V4L2 capture example at
  29  * http://v4l2spec.bytesex.org/spec/capture-example.html
  30  */
  31
  32 /*****************************************************************************
  33  * Preamble
  34  *****************************************************************************/
  35
  36 #ifdef HAVE_CONFIG_H
  37 # include "config.h"
  38 #endif
  39
  40 #include <vlc_common.h>
  41 #include <vlc_plugin.h>
  42 #include <vlc_access.h>
  43 #include <vlc_demux.h>
  44 #include <vlc_input.h>
  45
  46 #include <ctype.h>
  47 #include <fcntl.h>
  48 #include <sys/ioctl.h>
  49 #include <sys/mman.h>
  50
  51 #include <linux/videodev2.h>
  52
  53 #include <poll.h>
  54
  55 #ifdef HAVE_LIBV4L2
  56 #   include <libv4l2.h>
  57 #endif
  58
  59 /*****************************************************************************
  60  * Module descriptior
  61  *****************************************************************************/
  62
  63 static int  DemuxOpen ( vlc_object_t * );
  64 static void DemuxClose( vlc_object_t * );
  65 static int  AccessOpen ( vlc_object_t * );
  66 static void AccessClose( vlc_object_t * );
  67
  68 #define STANDARD_TEXT N_( "Standard" )
  69 #define STANDARD_LONGTEXT N_( \
  70     "Video standard (Default, SECAM, PAL, or NTSC)." )
  71 #define CHROMA_TEXT N_("Video input chroma format")
  72 #define CHROMA_LONGTEXT N_( \
  73     "Force the Video4Linux2 video device to use a specific chroma format " \
  74     "(eg. I420 or I422 for raw images, MJPG for M-JPEG compressed input) " \
  75     "(Complete list: GREY, I240, RV16, RV15, RV24, RV32, YUY2, YUYV, UYVY, " \
  76     "I41N, I422, I420, I411, I410, MJPG)")
  77 #define INPUT_TEXT N_( "Input" )
  78 #define INPUT_LONGTEXT N_( \
  79     "Input of the card to use (see debug)." )
  80 #define AUDIO_INPUT_TEXT N_( "Audio input" )
  81 #define AUDIO_INPUT_LONGTEXT N_( \
  82     "Audio input of the card to use (see debug)." )
  83 #define IOMETHOD_TEXT N_( "IO Method" )
  84 #define IOMETHOD_LONGTEXT N_( \
  85     "IO Method (READ, MMAP, USERPTR)." )
  86 #define WIDTH_TEXT N_( "Width" )
  87 #define WIDTH_LONGTEXT N_( \
  88     "Force width (-1 for autodetect, 0 for driver default)." )
  89 #define HEIGHT_TEXT N_( "Height" )
  90 #define HEIGHT_LONGTEXT N_( \
  91     "Force height (-1 for autodetect, 0 for driver default)." )
  92 #define FPS_TEXT N_( "Framerate" )
  93 #define FPS_LONGTEXT N_( "Framerate to capture, if applicable " \
  94     "(0 for autodetect)." )
  95
  96 #ifdef HAVE_LIBV4L2
  97 #define LIBV4L2_TEXT N_( "Use libv4l2" )
  98 #define LIBV4L2_LONGTEXT N_( \
  99     "Force usage of the libv4l2 wrapper." )
 100 #endif
 101
 102 #define CTRL_RESET_TEXT N_( "Reset v4l2 controls" )
 103 #define CTRL_RESET_LONGTEXT N_( \
 104     "Reset controls to defaults provided by the v4l2 driver." )
 105 #define BRIGHTNESS_TEXT N_( "Brightness" )
 106 #define BRIGHTNESS_LONGTEXT N_( \
 107     "Brightness of the video input (if supported by the v4l2 driver)." )
 108 #define CONTRAST_TEXT N_( "Contrast" )
 109 #define CONTRAST_LONGTEXT N_( \
 110     "Contrast of the video input (if supported by the v4l2 driver)." )
 111 #define SATURATION_TEXT N_( "Saturation" )
 112 #define SATURATION_LONGTEXT N_( \
 113     "Saturation of the video input (if supported by the v4l2 driver)." )
 114 #define HUE_TEXT N_( "Hue" )
 115 #define HUE_LONGTEXT N_( \
 116     "Hue of the video input (if supported by the v4l2 driver)." )
 117 #define BLACKLEVEL_TEXT N_( "Black level" )
 118 #define BLACKLEVEL_LONGTEXT N_( \
 119     "Black level of the video input (if supported by the v4l2 driver)." )
 120 #define AUTOWHITEBALANCE_TEXT N_( "Auto white balance" )
 121 #define AUTOWHITEBALANCE_LONGTEXT N_( \
 122     "Automatically set the white balance of the video input " \
 123     "(if supported by the v4l2 driver)." )
 124 #define DOWHITEBALANCE_TEXT N_( "Do white balance" )
 125 #define DOWHITEBALANCE_LONGTEXT N_( \
 126     "Trigger a white balancing action, useless if auto white balance is " \
 127     "activated (if supported by the v4l2 driver)." )
 128 #define REDBALANCE_TEXT N_( "Red balance" )
 129 #define REDBALANCE_LONGTEXT N_( \
 130     "Red balance of the video input (if supported by the v4l2 driver)." )
 131 #define BLUEBALANCE_TEXT N_( "Blue balance" )
 132 #define BLUEBALANCE_LONGTEXT N_( \
 133     "Blue balance of the video input (if supported by the v4l2 driver)." )
 134 #define GAMMA_TEXT N_( "Gamma" )
 135 #define GAMMA_LONGTEXT N_( \
 136     "Gamma of the video input (if supported by the v4l2 driver)." )
 137 #define EXPOSURE_TEXT N_( "Exposure" )
 138 #define EXPOSURE_LONGTEXT N_( \
 139     "Exposure of the video input (if supported by the v4L2 driver)." )
 140 #define AUTOGAIN_TEXT N_( "Auto gain" )
 141 #define AUTOGAIN_LONGTEXT N_( \
 142     "Automatically set the video input's gain (if supported by the " \
 143     "v4l2 driver)." )
 144 #define GAIN_TEXT N_( "Gain" )
 145 #define GAIN_LONGTEXT N_( \
 146     "Video input's gain (if supported by the v4l2 driver)." )
 147 #define HFLIP_TEXT N_( "Horizontal flip" )
 148 #define HFLIP_LONGTEXT N_( \
 149     "Flip the video horizontally (if supported by the v4l2 driver)." )
 150 #define VFLIP_TEXT N_( "Vertical flip" )
 151 #define VFLIP_LONGTEXT N_( \
 152     "Flip the video vertically (if supported by the v4l2 driver)." )
 153 #define HCENTER_TEXT N_( "Horizontal centering" )
 154 #define HCENTER_LONGTEXT N_( \
 155     "Set the camera's horizontal centering (if supported by the v4l2 driver)." )
 156 #define VCENTER_TEXT N_( "Vertical centering" )
 157 #define VCENTER_LONGTEXT N_( \
 158     "Set the camera's vertical centering (if supported by the v4l2 driver)." )
 159
 160 #define AUDIO_VOLUME_TEXT N_( "Volume" )
 161 #define AUDIO_VOLUME_LONGTEXT N_( \
 162     "Volume of the audio input (if supported by the v4l2 driver)." )
 163 #define AUDIO_BALANCE_TEXT N_( "Balance" )
 164 #define AUDIO_BALANCE_LONGTEXT N_( \
 165     "Balance of the audio input (if supported by the v4l2 driver)." )
 166 #define AUDIO_MUTE_TEXT N_( "Mute" )
 167 #define AUDIO_MUTE_LONGTEXT N_( \
 168     "Mute audio input (if supported by the v4l2 driver)." )
 169 #define AUDIO_BASS_TEXT N_( "Bass" )
 170 #define AUDIO_BASS_LONGTEXT N_( \
 171     "Bass level of the audio input (if supported by the v4l2 driver)." )
 172 #define AUDIO_TREBLE_TEXT N_( "Treble" )
 173 #define AUDIO_TREBLE_LONGTEXT N_( \
 174     "Treble level of the audio input (if supported by the v4l2 driver)." )
 175 #define AUDIO_LOUDNESS_TEXT N_( "Loudness" )
 176 #define AUDIO_LOUDNESS_LONGTEXT N_( \
 177     "Loudness of the audio input (if supported by the v4l2 driver)." )
 178
 179 #define CACHING_TEXT N_("Caching value in ms")
 180 #define CACHING_LONGTEXT N_( \
 181     "Caching value for V4L2 captures. This " \
 182     "value should be set in milliseconds." )
 183 #define S_CTRLS_TEXT N_("v4l2 driver controls")
 184 #define S_CTRLS_LONGTEXT N_( \
 185     "Set the v4l2 driver controls to the values specified using a comma " \
 186     "separated list optionally encapsulated by curly braces " \
 187     "(e.g.: {video_bitrate=6000000,audio_crc=0,stream_type=3} ). " \
 188     "To list available controls, increase verbosity (-vvv) " \
 189     "or use the v4l2-ctl application." )
 190
 191 #define TUNER_TEXT N_("Tuner id")
 192 #define TUNER_LONGTEXT N_( \
 193     "Tuner id (see debug output)." )
 194 #define FREQUENCY_TEXT N_("Frequency")
 195 #define FREQUENCY_LONGTEXT N_( \
 196     "Tuner frequency in Hz or kHz (see debug output)" )
 197 #define TUNER_AUDIO_MODE_TEXT N_("Audio mode")
 198 #define TUNER_AUDIO_MODE_LONGTEXT N_( \
 199     "Tuner audio mono/stereo and track selection." )
 200
 201 #define AUDIO_DEPRECATED_ERROR N_( \
 202     "Alsa or OSS audio capture in the v4l2 access is deprecated. " \
 203     "please use 'v4l2:/""/ :input-slave=alsa:/""/' or " \
 204     "'v4l2:/""/ :input-slave=oss:/""/' instead." )
 205
 206 typedef enum {
 207     IO_METHOD_READ,
 208     IO_METHOD_MMAP,
 209     IO_METHOD_USERPTR,
 210 } io_method;
 211
 212 static const int i_standards_list[] =
 213     { V4L2_STD_UNKNOWN, V4L2_STD_SECAM, V4L2_STD_PAL, V4L2_STD_NTSC };
 214 static const char *const psz_standards_list_text[] =
 215     { N_("Default"), N_("SECAM"), N_("PAL"),  N_("NTSC") };
 216
 217 static const int i_iomethod_list[] =
 218     { IO_METHOD_READ, IO_METHOD_MMAP, IO_METHOD_USERPTR };
 219 static const char *const psz_iomethod_list_text[] =
 220     { N_("READ"), N_("MMAP"),  N_("USERPTR") };
 221
 222 static const int i_tuner_audio_modes_list[] =
 223     { V4L2_TUNER_MODE_MONO, V4L2_TUNER_MODE_STEREO,
 224       V4L2_TUNER_MODE_LANG1, V4L2_TUNER_MODE_LANG2,
 225       V4L2_TUNER_MODE_SAP, V4L2_TUNER_MODE_LANG1_LANG2 };
 226 static const char *const psz_tuner_audio_modes_list_text[] =
 227     { N_( "Mono" ),
 228       N_( "Stereo" ),
 229       N_( "Primary language (Analog TV tuners only)" ),
 230       N_( "Secondary language (Analog TV tuners only)" ),
 231       N_( "Second audio program (Analog TV tuners only)" ),
 232       N_( "Primary language left, Secondary language right" ) };
 233
 234 #define V4L2_DEFAULT "/dev/video0"
 235 #define CFG_PREFIX "v4l2-"
 236
 237 vlc_module_begin ()
 238     set_shortname( N_("Video4Linux2") )
 239     set_description( N_("Video4Linux2 input") )
 240     set_category( CAT_INPUT )
 241     set_subcategory( SUBCAT_INPUT_ACCESS )
 242
 243     set_section( N_( "Video input" ), NULL )
 244     add_integer( CFG_PREFIX "standard", 0, NULL, STANDARD_TEXT,
 245                  STANDARD_LONGTEXT, false )
 246         change_integer_list( i_standards_list, psz_standards_list_text, NULL )
 247     add_string( CFG_PREFIX "chroma", NULL, NULL, CHROMA_TEXT, CHROMA_LONGTEXT,
 248                 true )
 249     add_integer( CFG_PREFIX "input", 0, NULL, INPUT_TEXT, INPUT_LONGTEXT,
 250                 true )
 251     add_integer( CFG_PREFIX "audio-input", 0, NULL, AUDIO_INPUT_TEXT,
 252                  AUDIO_INPUT_LONGTEXT, true )
 253     add_integer( CFG_PREFIX "io", IO_METHOD_MMAP, NULL, IOMETHOD_TEXT,
 254                  IOMETHOD_LONGTEXT, true )
 255         change_integer_list( i_iomethod_list, psz_iomethod_list_text, NULL )
 256     add_integer( CFG_PREFIX "width", -1, NULL, WIDTH_TEXT,
 257                 WIDTH_LONGTEXT, true )
 258     add_integer( CFG_PREFIX "height", -1, NULL, HEIGHT_TEXT,
 259                 HEIGHT_LONGTEXT, true )
 260     add_float( CFG_PREFIX "fps", 0, NULL, FPS_TEXT, FPS_LONGTEXT, true )
 261     add_integer( CFG_PREFIX "caching", DEFAULT_PTS_DELAY / 1000, NULL,
 262                 CACHING_TEXT, CACHING_LONGTEXT, true )
 263 #ifdef HAVE_LIBV4L2
 264     add_bool( CFG_PREFIX "use-libv4l2", false, NULL, LIBV4L2_TEXT, LIBV4L2_LONGTEXT, true );
 265 #endif
 266
 267     set_section( N_( "Tuner" ), NULL )
 268     add_integer( CFG_PREFIX "tuner", 0, NULL, TUNER_TEXT, TUNER_LONGTEXT,
 269                  true )
 270     add_integer( CFG_PREFIX "tuner-frequency", -1, NULL, FREQUENCY_TEXT,
 271                  FREQUENCY_LONGTEXT, true )
 272     add_integer( CFG_PREFIX "tuner-audio-mode", -1, NULL, TUNER_AUDIO_MODE_TEXT,
 273                  TUNER_AUDIO_MODE_LONGTEXT, true )
 274         change_integer_list( i_tuner_audio_modes_list,
 275                              psz_tuner_audio_modes_list_text, 0 )
 276
 277     set_section( N_( "Controls" ),
 278                  N_( "v4l2 driver controls, if supported by your v4l2 driver." ) )
 279     add_bool( CFG_PREFIX "controls-reset", false, NULL, CTRL_RESET_TEXT,
 280               CTRL_RESET_LONGTEXT, true )
 281     add_integer( CFG_PREFIX "brightness", -1, NULL, BRIGHTNESS_TEXT,
 282                  BRIGHTNESS_LONGTEXT, true )
 283     add_integer( CFG_PREFIX "contrast", -1, NULL, CONTRAST_TEXT,
 284                  CONTRAST_LONGTEXT, true )
 285     add_integer( CFG_PREFIX "saturation", -1, NULL, SATURATION_TEXT,
 286                  SATURATION_LONGTEXT, true )
 287     add_integer( CFG_PREFIX "hue", -1, NULL, HUE_TEXT,
 288                  HUE_LONGTEXT, true )
 289     add_integer( CFG_PREFIX "black-level", -1, NULL, BLACKLEVEL_TEXT,
 290                  BLACKLEVEL_LONGTEXT, true )
 291     add_integer( CFG_PREFIX "auto-white-balance", -1, NULL,
 292                  AUTOWHITEBALANCE_TEXT, AUTOWHITEBALANCE_LONGTEXT, true )
 293     add_integer( CFG_PREFIX "do-white-balance", -1, NULL, DOWHITEBALANCE_TEXT,
 294                  DOWHITEBALANCE_LONGTEXT, true )
 295     add_integer( CFG_PREFIX "red-balance", -1, NULL, REDBALANCE_TEXT,
 296                  REDBALANCE_LONGTEXT, true )
 297     add_integer( CFG_PREFIX "blue-balance", -1, NULL, BLUEBALANCE_TEXT,
 298                  BLUEBALANCE_LONGTEXT, true )
 299     add_integer( CFG_PREFIX "gamma", -1, NULL, GAMMA_TEXT,
 300                  GAMMA_LONGTEXT, true )
 301     add_integer( CFG_PREFIX "exposure", -1, NULL, EXPOSURE_TEXT,
 302                  EXPOSURE_LONGTEXT, true )
 303     add_integer( CFG_PREFIX "autogain", -1, NULL, AUTOGAIN_TEXT,
 304                  AUTOGAIN_LONGTEXT, true )
 305     add_integer( CFG_PREFIX "gain", -1, NULL, GAIN_TEXT,
 306                  GAIN_LONGTEXT, true )
 307     add_integer( CFG_PREFIX "hflip", -1, NULL, HFLIP_TEXT,
 308                  HFLIP_LONGTEXT, true )
 309     add_integer( CFG_PREFIX "vflip", -1, NULL, VFLIP_TEXT,
 310                  VFLIP_LONGTEXT, true )
 311     add_integer( CFG_PREFIX "hcenter", -1, NULL, HCENTER_TEXT,
 312                  HCENTER_LONGTEXT, true )
 313     add_integer( CFG_PREFIX "vcenter", -1, NULL, VCENTER_TEXT,
 314                  VCENTER_LONGTEXT, true )
 315     add_integer( CFG_PREFIX "audio-volume", -1, NULL, AUDIO_VOLUME_TEXT,
 316                 AUDIO_VOLUME_LONGTEXT, true )
 317     add_integer( CFG_PREFIX "audio-balance", -1, NULL, AUDIO_BALANCE_TEXT,
 318                 AUDIO_BALANCE_LONGTEXT, true )
 319     add_bool( CFG_PREFIX "audio-mute", false, NULL, AUDIO_MUTE_TEXT,
 320               AUDIO_MUTE_LONGTEXT, true )
 321     add_integer( CFG_PREFIX "audio-bass", -1, NULL, AUDIO_BASS_TEXT,
 322                 AUDIO_BASS_LONGTEXT, true )
 323     add_integer( CFG_PREFIX "audio-treble", -1, NULL, AUDIO_TREBLE_TEXT,
 324                 AUDIO_TREBLE_LONGTEXT, true )
 325     add_integer( CFG_PREFIX "audio-loudness", -1, NULL, AUDIO_LOUDNESS_TEXT,
 326                 AUDIO_LOUDNESS_LONGTEXT, true )
 327     add_string( CFG_PREFIX "set-ctrls", NULL, NULL, S_CTRLS_TEXT,
 328               S_CTRLS_LONGTEXT, true )
 329
 330     add_obsolete_string( CFG_PREFIX "dev" )
 331
 332     add_obsolete_string( CFG_PREFIX "adev" )
 333     add_obsolete_integer( CFG_PREFIX "audio-method" )
 334     add_obsolete_bool( CFG_PREFIX "stereo" )
 335     add_obsolete_integer( CFG_PREFIX "samplerate" )
 336
 337     add_shortcut( "v4l2" )
 338     set_capability( "access_demux", 10 )
 339     set_callbacks( DemuxOpen, DemuxClose )
 340
 341     add_submodule ()
 342     add_shortcut( "v4l2" )
 343     add_shortcut( "v4l2c" )
 344     set_description( N_("Video4Linux2 Compressed A/V") )
 345     set_capability( "access", 0 )
 346     /* use these when open as access_demux fails; VLC will use another demux */
 347     set_callbacks( AccessOpen, AccessClose )
 348
 349 vlc_module_end ()
 350
 351 /*****************************************************************************
 352  * Access: local prototypes
 353  *****************************************************************************/
 354
 355 static void CommonClose( vlc_object_t *, demux_sys_t * );
 356 static void ParseMRL( demux_sys_t *, char *, vlc_object_t * );
 357 static void GetV4L2Params( demux_sys_t *, vlc_object_t * );
 358 static void SetAvailControlsByString( vlc_object_t *, demux_sys_t *, int );
 359
 360 static int DemuxControl( demux_t *, int, va_list );
 361 static int AccessControl( access_t *, int, va_list );
 362
 363 static int Demux( demux_t * );
 364 static ssize_t AccessRead( access_t *, uint8_t *, size_t );
 365
 366 static block_t* GrabVideo( demux_t *p_demux );
 367 static block_t* ProcessVideoFrame( demux_t *p_demux, uint8_t *p_frame, size_t );
 368
 369 static bool IsPixelFormatSupported( demux_t *p_demux,
 370                                           unsigned int i_pixelformat );
 371
 372 static int OpenVideoDev( vlc_object_t *, demux_sys_t *, bool );
 373 static bool ProbeVideoDev( vlc_object_t *, demux_sys_t *,
 374                                  const char *psz_device );
 375
 376 static int ControlList( vlc_object_t *, demux_sys_t *, int , bool, bool );
 377 static int Control( vlc_object_t *, demux_sys_t *, int i_fd,
 378                     const char *psz_name, int i_cid, int i_value );
 379
 380 static int DemuxControlCallback( vlc_object_t *p_this, const char *psz_var,
 381                                  vlc_value_t oldval, vlc_value_t newval,
 382                                  void *p_data );
 383 static int DemuxControlResetCallback( vlc_object_t *p_this, const char *psz_var,
 384                                       vlc_value_t oldval, vlc_value_t newval,
 385                                       void *p_data );
 386 static int AccessControlCallback( vlc_object_t *p_this, const char *psz_var,
 387                                   vlc_value_t oldval, vlc_value_t newval,
 388                                   void *p_data );
 389 static int AccessControlResetCallback( vlc_object_t *p_this,
 390                                        const char *psz_var, vlc_value_t oldval,
 391                                        vlc_value_t newval, void *p_data );
 392
 393 static const struct
 394 {
 395     unsigned int i_v4l2;
 396     vlc_fourcc_t i_fourcc;
 397     int i_rmask;
 398     int i_gmask;
 399     int i_bmask;
 400 } v4l2chroma_to_fourcc[] =
 401 {
 402     /* Raw data types */
 403     { V4L2_PIX_FMT_GREY,    VLC_CODEC_GREY, 0, 0, 0 },
 404     { V4L2_PIX_FMT_HI240,   VLC_FOURCC('I','2','4','0'), 0, 0, 0 },
 405     { V4L2_PIX_FMT_RGB555,  VLC_CODEC_RGB15, 0x001f,0x03e0,0x7c00 },
 406     { V4L2_PIX_FMT_RGB565,  VLC_CODEC_RGB16, 0x001f,0x07e0,0xf800 },
 407     /* Won't work since we don't know how to handle such gmask values
 408      * correctly
 409     { V4L2_PIX_FMT_RGB555X, VLC_CODEC_RGB15, 0x007c,0xe003,0x1f00 },
 410     { V4L2_PIX_FMT_RGB565X, VLC_CODEC_RGB16, 0x00f8,0xe007,0x1f00 },
 411     */
 412     { V4L2_PIX_FMT_BGR24,   VLC_CODEC_RGB24, 0xff0000,0xff00,0xff },
 413     { V4L2_PIX_FMT_RGB24,   VLC_CODEC_RGB24, 0xff,0xff00,0xff0000 },
 414     { V4L2_PIX_FMT_BGR32,   VLC_CODEC_RGB32, 0xff0000,0xff00,0xff },
 415     { V4L2_PIX_FMT_RGB32,   VLC_CODEC_RGB32, 0xff,0xff00,0xff0000 },
 416     { V4L2_PIX_FMT_YUYV,    VLC_CODEC_YUYV, 0, 0, 0 },
 417     { V4L2_PIX_FMT_UYVY,    VLC_CODEC_UYVY, 0, 0, 0 },
 418     { V4L2_PIX_FMT_Y41P,    VLC_FOURCC('I','4','1','N'), 0, 0, 0 },
 419     { V4L2_PIX_FMT_YUV422P, VLC_CODEC_I422, 0, 0, 0 },
 420     { V4L2_PIX_FMT_YVU420,  VLC_CODEC_YV12, 0, 0, 0 },
 421     { V4L2_PIX_FMT_YUV411P, VLC_CODEC_I411, 0, 0, 0 },
 422     { V4L2_PIX_FMT_YUV410,  VLC_CODEC_I410, 0, 0, 0 },
 423
 424     /* Raw data types, not in V4L2 spec but still in videodev2.h and supported
 425      * by VLC */
 426     { V4L2_PIX_FMT_YUV420,  VLC_CODEC_I420, 0, 0, 0 },
 427     /* FIXME { V4L2_PIX_FMT_RGB444,  VLC_CODEC_RGB32 }, */
 428
 429     /* Compressed data types */
 430     { V4L2_PIX_FMT_MJPEG,   VLC_CODEC_MJPG, 0, 0, 0 },
 431 #if 0
 432     { V4L2_PIX_FMT_JPEG,    VLC_FOURCC('J','P','E','G') },
 433     { V4L2_PIX_FMT_DV,      VLC_FOURCC('?','?','?','?') },
 434     { V4L2_PIX_FMT_MPEG,    VLC_FOURCC('?','?','?','?') },
 435 #endif
 436     { 0, 0, 0, 0, 0 }
 437 };
 438
 439 /**
 440  * List of V4L2 chromas were confident enough to use as fallbacks if the
 441  * user hasn't provided a --v4l2-chroma value.
 442  *
 443  * Try YUV chromas first, then RGB little endian and MJPEG as last resort.
 444  */
 445 static const __u32 p_chroma_fallbacks[] =
 446 { V4L2_PIX_FMT_YUV420, V4L2_PIX_FMT_YVU420, V4L2_PIX_FMT_YUV422P,
 447   V4L2_PIX_FMT_YUYV, V4L2_PIX_FMT_UYVY, V4L2_PIX_FMT_BGR24,
 448   V4L2_PIX_FMT_BGR32, V4L2_PIX_FMT_MJPEG };
 449
 450 static const struct
 451 {
 452     const char *psz_name;
 453     unsigned int i_cid;
 454 } controls[] =
 455 {
 456     { "brightness", V4L2_CID_BRIGHTNESS },
 457     { "contrast", V4L2_CID_CONTRAST },
 458     { "saturation", V4L2_CID_SATURATION },
 459     { "hue", V4L2_CID_HUE },
 460     { "audio-volume", V4L2_CID_AUDIO_VOLUME },
 461     { "audio-balance", V4L2_CID_AUDIO_BALANCE },
 462     { "audio-bass", V4L2_CID_AUDIO_BASS },
 463     { "audio-treble", V4L2_CID_AUDIO_TREBLE },
 464     { "audio-mute", V4L2_CID_AUDIO_MUTE },
 465     { "audio-loudness", V4L2_CID_AUDIO_LOUDNESS },
 466     { "black-level", V4L2_CID_BLACK_LEVEL },
 467     { "auto-white-balance", V4L2_CID_AUTO_WHITE_BALANCE },
 468     { "do-white-balance", V4L2_CID_DO_WHITE_BALANCE },
 469     { "red-balance", V4L2_CID_RED_BALANCE },
 470     { "blue-balance", V4L2_CID_BLUE_BALANCE },
 471     { "gamma", V4L2_CID_GAMMA },
 472     { "exposure", V4L2_CID_EXPOSURE },
 473     { "autogain", V4L2_CID_AUTOGAIN },
 474     { "gain", V4L2_CID_GAIN },
 475     { "hflip", V4L2_CID_HFLIP },
 476     { "vflip", V4L2_CID_VFLIP },
 477     { "hcenter", V4L2_CID_HCENTER },
 478     { "vcenter", V4L2_CID_VCENTER },
 479     { NULL, 0 }
 480 };
 481
 482 struct buffer_t
 483 {
 484     void *  start;
 485     size_t  length;
 486 };
 487
 488 struct demux_sys_t
 489 {
 490     char *psz_device;  /* Main device from MRL */
 491     int  i_fd;
 492
 493     char *psz_requested_chroma;
 494
 495     /* Video */
 496     io_method io;
 497
 498     int i_cache;
 499
 500     struct v4l2_capability dev_cap;
 501
 502     int i_input;
 503     struct v4l2_input *p_inputs;
 504     int i_selected_input;
 505
 506     int i_standard;
 507     struct v4l2_standard *p_standards;
 508     v4l2_std_id i_selected_standard_id;
 509
 510     int i_audio;
 511     /* V4L2 devices cannot have more than 32 audio inputs */
 512     struct v4l2_audio p_audios[32];
 513     int i_selected_audio_input;
 514
 515     int i_tuner;
 516     struct v4l2_tuner *p_tuners;
 517
 518     int i_codec;
 519     struct v4l2_fmtdesc *p_codecs;
 520
 521     struct buffer_t *p_buffers;
 522     unsigned int i_nbuffers;
 523
 524     int i_width;
 525     int i_height;
 526     float f_fps;            /* <= 0.0 mean to grab at full rate */
 527     mtime_t i_video_pts;    /* only used when f_fps > 0 */
 528     int i_fourcc;
 529
 530     es_out_id_t *p_es;
 531
 532     /* Tuner */
 533     int i_cur_tuner;
 534     int i_frequency;
 535     int i_audio_mode;
 536
 537     /* Controls */
 538     char *psz_set_ctrls;
 539
 540
 541 #ifdef HAVE_LIBV4L2
 542     /* */
 543     int (*pf_close)( int );
 544     int (*pf_dup)( int );
 545     int (*pf_ioctl)( int, unsigned long int, ... );
 546     ssize_t (*pf_read)( int, void *, size_t );
 547     void *(*pf_mmap)( void *, size_t, int, int, int, off_t );
 548     int (*pf_munmap)( void *, size_t );
 549     bool b_libv4l2;
 550 #endif
 551 };
 552
 553 #ifdef HAVE_LIBV4L2
 554 static void use_kernel_v4l2( demux_sys_t *p_sys )
 555 {
 556     p_sys->pf_close = close;
 557     p_sys->pf_dup = dup;
 558     p_sys->pf_ioctl = ioctl;
 559     p_sys->pf_read = read;
 560     p_sys->pf_mmap = mmap;
 561     p_sys->pf_munmap = munmap;
 562     p_sys->b_libv4l2 = false;
 563 }
 564
 565 static void use_libv4l2( demux_sys_t *p_sys )
 566 {
 567     p_sys->pf_close = v4l2_close;
 568     p_sys->pf_dup = v4l2_dup;
 569     p_sys->pf_ioctl = v4l2_ioctl;
 570     p_sys->pf_read = v4l2_read;
 571     p_sys->pf_mmap = v4l2_mmap;
 572     p_sys->pf_munmap = v4l2_munmap;
 573     p_sys->b_libv4l2 = true;
 574 }
 575
 576 #   define v4l2_close (p_sys->pf_close)
 577 #   define v4l2_dup (p_sys->pf_dup)
 578 #   define v4l2_ioctl (p_sys->pf_ioctl)
 579 #   define v4l2_read (p_sys->pf_read)
 580 #   define v4l2_mmap (p_sys->pf_mmap)
 581 #   define v4l2_munmap (p_sys->pf_munmap)
 582 #else
 583 #   define v4l2_close close
 584 #   define v4l2_dup dup
 585 #   define v4l2_ioctl ioctl
 586 #   define v4l2_read read
 587 #   define v4l2_mmap mmap
 588 #   define v4l2_munmap munmap
 589 #endif
 590
 591 static int FindMainDevice( vlc_object_t *p_this, demux_sys_t *p_sys,
 592                            bool b_demux )
 593 {
 594     /* TODO: if using default device, loop through all /dev/video* until
 595      * one works */
 596     msg_Dbg( p_this, "opening device '%s'", p_sys->psz_device );
 597     if( ProbeVideoDev( p_this, p_sys, p_sys->psz_device ) )
 598     {
 599         msg_Dbg( p_this, "'%s' is a video device", p_sys->psz_device );
 600         p_sys->i_fd = OpenVideoDev( p_this, p_sys, b_demux );
 601     }
 602
 603     if( p_sys->i_fd < 0 ) return VLC_EGENERIC;
 604     return VLC_SUCCESS;
 605 }
 606
 607 /*****************************************************************************
 608  * DemuxOpen: opens v4l2 device, access_demux callback
 609  *****************************************************************************
 610  *
 611  * url: <video device>::::
 612  *
 613  *****************************************************************************/
 614 static int DemuxOpen( vlc_object_t *p_this )
 615 {
 616     demux_t     *p_demux = (demux_t*)p_this;
 617     demux_sys_t *p_sys;
 618
 619     /* Only when selected */
 620     if( strcmp( p_demux->psz_access, "v4l2" ) )
 621         return VLC_EGENERIC;
 622
 623     /* Set up p_demux */
 624     p_demux->pf_control = DemuxControl;
 625     p_demux->pf_demux = Demux;
 626     p_demux->info.i_update = 0;
 627     p_demux->info.i_title = 0;
 628     p_demux->info.i_seekpoint = 0;
 629
 630     p_demux->p_sys = p_sys = calloc( 1, sizeof( demux_sys_t ) );
 631     if( p_sys == NULL ) return VLC_ENOMEM;
 632
 633     GetV4L2Params(p_sys, (vlc_object_t *) p_demux);
 634
 635     ParseMRL( p_sys, p_demux->psz_path, (vlc_object_t *) p_demux );
 636
 637 #ifdef HAVE_LIBV4L2
 638     if( !config_GetInt( p_this, CFG_PREFIX "use-libv4l2" ) )
 639     {
 640         msg_Dbg( p_this, "Trying direct kernel v4l2" );
 641         use_kernel_v4l2( p_sys );
 642         if( FindMainDevice( p_this, p_sys, true ) == VLC_SUCCESS)
 643             return VLC_SUCCESS;
 644     }
 645
 646     msg_Dbg( p_this, "Trying libv4l2 wrapper" );
 647     use_libv4l2( p_sys );
 648 #endif
 649     if( FindMainDevice( p_this, p_sys, true ) == VLC_SUCCESS)
 650         return VLC_SUCCESS;
 651
 652     DemuxClose( p_this );
 653     return VLC_EGENERIC;
 654 }
 655
 656 /*****************************************************************************
 657  * GetV4L2Params: fill in p_sys parameters (shared by DemuxOpen and AccessOpen)
 658  *****************************************************************************/
 659 static void GetV4L2Params( demux_sys_t *p_sys, vlc_object_t *p_obj )
 660 {
 661     p_sys->i_video_pts = -1;
 662
 663     p_sys->i_selected_standard_id =
 664         i_standards_list[var_CreateGetInteger( p_obj, "v4l2-standard" )];
 665
 666     p_sys->i_selected_input = var_CreateGetInteger( p_obj, "v4l2-input" );
 667     p_sys->i_selected_audio_input =
 668         var_CreateGetInteger( p_obj, "v4l2-audio-input" );
 669
 670     p_sys->io = var_CreateGetInteger( p_obj, "v4l2-io" );
 671
 672     p_sys->i_width = var_CreateGetInteger( p_obj, "v4l2-width" );
 673     p_sys->i_height = var_CreateGetInteger( p_obj, "v4l2-height" );
 674
 675     var_Create( p_obj, "v4l2-controls-reset", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
 676
 677     p_sys->f_fps = var_CreateGetFloat( p_obj, "v4l2-fps" );
 678     p_sys->psz_requested_chroma = var_CreateGetString( p_obj, "v4l2-chroma" );
 679
 680     p_sys->i_cache = var_CreateGetInteger( p_obj, "v4l2-caching" );
 681
 682     p_sys->i_cur_tuner = var_CreateGetInteger( p_obj, "v4l2-tuner" );
 683     p_sys->i_frequency = var_CreateGetInteger( p_obj, "v4l2-tuner-frequency" );
 684     p_sys->i_audio_mode = var_CreateGetInteger( p_obj, "v4l2-tuner-audio-mode" );
 685
 686     p_sys->psz_set_ctrls = var_CreateGetString( p_obj, "v4l2-set-ctrls" );
 687
 688     p_sys->psz_device = NULL;
 689     p_sys->i_fd = -1;
 690
 691     p_sys->p_es = NULL;
 692 }
 693
 694 /*****************************************************************************
 695  * ParseMRL: parse the options contained in the MRL
 696  *****************************************************************************/
 697 static void ParseMRL( demux_sys_t *p_sys, char *psz_path, vlc_object_t *p_obj )
 698 {
 699     char *psz_dup = strdup( psz_path );
 700     char *psz_parser = psz_dup;
 701
 702     while( *psz_parser && *psz_parser != ':' )
 703     {
 704         psz_parser++;
 705     }
 706
 707     if( *psz_parser == ':' )
 708     {
 709         /* read options */
 710         for( ;; )
 711         {
 712             *psz_parser++ = '\0';
 713
 714             if( !strncmp( psz_parser, "standard=", strlen( "standard=" ) ) )
 715             {
 716                 psz_parser += strlen( "standard=" );
 717                 if( !strncmp( psz_parser, "pal", strlen( "pal" ) ) )
 718                 {
 719                     p_sys->i_selected_standard_id = V4L2_STD_PAL;
 720                     psz_parser += strlen( "pal" );
 721                 }
 722                 else if( !strncmp( psz_parser, "ntsc", strlen( "ntsc" ) ) )
 723                 {
 724                     p_sys->i_selected_standard_id = V4L2_STD_NTSC;
 725                     psz_parser += strlen( "ntsc" );
 726                 }
 727                 else if( !strncmp( psz_parser, "secam", strlen( "secam" ) ) )
 728                 {
 729                     p_sys->i_selected_standard_id = V4L2_STD_SECAM;
 730                     psz_parser += strlen( "secam" );
 731                 }
 732                 else if( !strncmp( psz_parser, "default", strlen( "default" ) ) )
 733                 {
 734                     p_sys->i_selected_standard_id = V4L2_STD_UNKNOWN;
 735                     psz_parser += strlen( "default" );
 736                 }
 737                 else
 738                 {
 739                     p_sys->i_selected_standard_id = i_standards_list[strtol( psz_parser, &psz_parser, 0 )];
 740                 }
 741             }
 742             else if( !strncmp( psz_parser, "chroma=", strlen( "chroma=" ) ) )
 743             {
 744                 int  i_len;
 745
 746                 psz_parser += strlen( "chroma=" );
 747                 if( strchr( psz_parser, ':' ) )
 748                 {
 749                     i_len = strchr( psz_parser, ':' ) - psz_parser;
 750                 }
 751                 else
 752                 {
 753                     i_len = strlen( psz_parser );
 754                 }
 755
 756                 free( p_sys->psz_requested_chroma );
 757                 p_sys->psz_requested_chroma = strndup( psz_parser, i_len );
 758
 759                 psz_parser += i_len;
 760             }
 761             else if( !strncmp( psz_parser, "input=", strlen( "input=" ) ) )
 762             {
 763                 p_sys->i_selected_input = strtol( psz_parser + strlen( "input=" ),
 764                                        &psz_parser, 0 );
 765             }
 766             else if( !strncmp( psz_parser, "audio-input=", strlen( "audio-input=" ) ) )
 767             {
 768                 p_sys->i_selected_audio_input = strtol( psz_parser + strlen( "audio-input=" ),
 769                                        &psz_parser, 0 );
 770             }
 771             else if( !strncmp( psz_parser, "fps=", strlen( "fps=" ) ) )
 772             {
 773                 p_sys->f_fps = strtof( psz_parser + strlen( "fps=" ),
 774                                        &psz_parser );
 775             }
 776             else if( !strncmp( psz_parser, "io=", strlen( "io=" ) ) )
 777             {
 778                 psz_parser += strlen( "io=" );
 779                 if( !strncmp( psz_parser, "read", strlen( "read" ) ) )
 780                 {
 781                     p_sys->io = IO_METHOD_READ;
 782                     psz_parser += strlen( "read" );
 783                 }
 784                 else if( !strncmp( psz_parser, "mmap", strlen( "mmap" ) ) )
 785                 {
 786                     p_sys->io = IO_METHOD_MMAP;
 787                     psz_parser += strlen( "mmap" );
 788                 }
 789                 else if( !strncmp( psz_parser, "userptr", strlen( "userptr" ) ) )
 790                 {
 791                     p_sys->io = IO_METHOD_USERPTR;
 792                     psz_parser += strlen( "userptr" );
 793                 }
 794                 else
 795                 {
 796                     p_sys->io = strtol( psz_parser, &psz_parser, 0 );
 797                 }
 798             }
 799             else if( !strncmp( psz_parser, "width=",
 800                                strlen( "width=" ) ) )
 801             {
 802                 p_sys->i_width =
 803                     strtol( psz_parser + strlen( "width=" ),
 804                             &psz_parser, 0 );
 805             }
 806             else if( !strncmp( psz_parser, "height=",
 807                                strlen( "height=" ) ) )
 808             {
 809                 p_sys->i_height =
 810                     strtol( psz_parser + strlen( "height=" ),
 811                             &psz_parser, 0 );
 812             }
 813             else if( !strncmp( psz_parser, "controls-reset",
 814                                strlen( "controls-reset" ) ) )
 815             {
 816                 var_SetBool( p_obj, "v4l2-controls-reset", true );
 817                 psz_parser += strlen( "controls-reset" );
 818             }
 819 #if 0
 820             else if( !strncmp( psz_parser, "brightness=",
 821                                strlen( "brightness=" ) ) )
 822             {
 823                 var_SetInteger( p_obj, "brightness",
 824                     strtol( psz_parser + strlen( "brightness=" ),
 825                             &psz_parser, 0 ) );
 826             }
 827             else if( !strncmp( psz_parser, "contrast=",
 828                                strlen( "contrast=" ) ) )
 829             {
 830                 var_SetInteger( p_obj, "contrast",
 831                     strtol( psz_parser + strlen( "contrast=" ),
 832                             &psz_parser, 0 ) );
 833             }
 834             else if( !strncmp( psz_parser, "saturation=",
 835                                strlen( "saturation=" ) ) )
 836             {
 837                 var_SetInteger( p_obj, "saturation",
 838                     strtol( psz_parser + strlen( "saturation=" ),
 839                             &psz_parser, 0 ) );
 840             }
 841             else if( !strncmp( psz_parser, "hue=",
 842                                strlen( "hue=" ) ) )
 843             {
 844                 var_SetInteger( p_obj, "hue",
 845                     strtol( psz_parser + strlen( "hue=" ),
 846                             &psz_parser, 0 ) );
 847             }
 848             else if( !strncmp( psz_parser, "gamma=",
 849                                strlen( "gamma=" ) ) )
 850             {
 851                 var_SetInteger( p_obj, "gamma",
 852                     strtol( psz_parser + strlen( "gamma=" ),
 853                             &psz_parser, 0 ) );
 854             }
 855 #endif
 856             else if( !strncmp( psz_parser, "caching=", strlen( "caching=" ) ) )
 857             {
 858                 p_sys->i_cache = strtol( psz_parser + strlen( "caching=" ),
 859                                          &psz_parser, 0 );
 860             }
 861             else if( !strncmp( psz_parser, "tuner=", strlen( "tuner=" ) ) )
 862             {
 863                 p_sys->i_cur_tuner = strtol( psz_parser + strlen( "tuner=" ),
 864                                          &psz_parser, 0 );
 865             }
 866             else if( !strncmp( psz_parser, "tuner-frequency=", strlen( "tuner-frequency=" ) ) )
 867             {
 868                 p_sys->i_frequency = strtol( psz_parser
 869                                           + strlen( "tuner-frequency=" ),
 870                                           &psz_parser, 0 );
 871             }
 872             else if( !strncmp( psz_parser, "tuner-audio-mode=", strlen( "tuner-audio-mode=" ) ) )
 873             {
 874                 p_sys->i_audio_mode = strtol( psz_parser
 875                                           + strlen( "tuner-audio-mode=" ),
 876                                           &psz_parser, 0 );
 877             }
 878             else if( !strncmp( psz_parser, "set-ctrls=", strlen( "set-ctrls=" )) )
 879             {
 880                 int  i_len;
 881
 882                 psz_parser += strlen( "set-ctrls=" );
 883                 if( strchr( psz_parser, ':' ) )
 884                 {
 885                     i_len = strchr( psz_parser, ':' ) - psz_parser;
 886                 }
 887                 else
 888                 {
 889                     i_len = strlen( psz_parser );
 890                 }
 891
 892                 p_sys->psz_set_ctrls = strndup( psz_parser, i_len );
 893
 894                 psz_parser += i_len;
 895             }
 896             else if( !strncmp( psz_parser, "adev=", strlen( "adev=" ) )
 897              || !strncmp( psz_parser, "samplerate=", strlen( "samplerate=" ) )
 898              || !strncmp( psz_parser, "audio-method", strlen( "audio-method" ) )
 899              || !strncmp( psz_parser, "stereo", strlen( "stereo" ) )
 900              || !strncmp( psz_parser, "mono", strlen( "mono" ) ) )
 901             {
 902                 if( strchr( psz_parser, ':' ) )
 903                 {
 904                     psz_parser = strchr( psz_parser, ':' );
 905                 }
 906                 else
 907                 {
 908                     psz_parser += strlen( psz_parser );
 909                 }
 910
 911                 msg_Err( p_obj, AUDIO_DEPRECATED_ERROR );
 912             }
 913             else
 914             {
 915                 char *psz_unk = strchr( psz_parser, ':' );
 916                 if (psz_unk)
 917                     psz_unk = strndup( psz_parser, psz_unk - psz_parser );
 918                 else
 919                     psz_unk = strdup( psz_parser);
 920                 msg_Warn( p_obj, "unknown option %s", psz_unk );
 921                 free (psz_unk);
 922             }
 923
 924             while( *psz_parser && *psz_parser != ':' )
 925             {
 926                 psz_parser++;
 927             }
 928
 929             if( *psz_parser == '\0' )
 930             {
 931                 break;
 932             }
 933         }
 934     }
 935
 936     /* Main device */
 937     if( *psz_dup )
 938         p_sys->psz_device = strdup( psz_dup );
 939     else
 940         p_sys->psz_device = strdup( V4L2_DEFAULT );
 941     free( psz_dup );
 942 }
 943
 944 /*****************************************************************************
 945  * Close: close device, free resources
 946  *****************************************************************************/
 947 static void AccessClose( vlc_object_t *p_this )
 948 {
 949     access_t    *p_access = (access_t *)p_this;
 950     demux_sys_t *p_sys   = (demux_sys_t *) p_access->p_sys;
 951
 952     CommonClose( p_this, p_sys );
 953 }
 954
 955 static void DemuxClose( vlc_object_t *p_this )
 956 {
 957     struct v4l2_buffer buf;
 958     enum v4l2_buf_type buf_type;
 959     unsigned int i;
 960
 961     demux_t     *p_demux = (demux_t *)p_this;
 962     demux_sys_t *p_sys   = p_demux->p_sys;
 963
 964     /* Stop video capture */
 965     if( p_sys->i_fd >= 0 )
 966     {
 967         switch( p_sys->io )
 968         {
 969         case IO_METHOD_READ:
 970             /* Nothing to do */
 971             break;
 972
 973         case IO_METHOD_MMAP:
 974         case IO_METHOD_USERPTR:
 975             /* Some drivers 'hang' internally if this is not done before streamoff */
 976             for( unsigned int i = 0; i < p_sys->i_nbuffers; i++ )
 977             {
 978                 memset( &buf, 0, sizeof(buf) );
 979                 buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 980                 buf.memory = ( p_sys->io == IO_METHOD_USERPTR ) ?
 981                     V4L2_MEMORY_USERPTR : V4L2_MEMORY_MMAP;
 982                 v4l2_ioctl( p_sys->i_fd, VIDIOC_DQBUF, &buf ); /* ignore result */
 983             }
 984
 985             buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 986             if( v4l2_ioctl( p_sys->i_fd, VIDIOC_STREAMOFF, &buf_type ) < 0 ) {
 987                 msg_Err( p_this, "VIDIOC_STREAMOFF failed" );
 988             }
 989
 990             break;
 991         }
 992     }
 993
 994     /* Free Video Buffers */
 995     if( p_sys->p_buffers ) {
 996         switch( p_sys->io )
 997         {
 998         case IO_METHOD_READ:
 999             free( p_sys->p_buffers[0].start );
1000             break;
1001
1002         case IO_METHOD_MMAP:
1003             for( i = 0; i < p_sys->i_nbuffers; ++i )
1004             {
1005                 if( v4l2_munmap( p_sys->p_buffers[i].start, p_sys->p_buffers[i].length ) )
1006                 {
1007                     msg_Err( p_this, "munmap failed" );
1008                 }
1009             }
1010             break;
1011
1012         case IO_METHOD_USERPTR:
1013             for( i = 0; i < p_sys->i_nbuffers; ++i )
1014             {
1015                free( p_sys->p_buffers[i].start );
1016             }
1017             break;
1018         }
1019         free( p_sys->p_buffers );
1020     }
1021
1022     CommonClose( p_this, p_sys );
1023 }
1024
1025 static void CommonClose( vlc_object_t *p_this, demux_sys_t *p_sys )
1026 {
1027     (void)p_this;
1028     /* Close */
1029     if( p_sys->i_fd >= 0 ) v4l2_close( p_sys->i_fd );
1030     free( p_sys->psz_device );
1031     free( p_sys->p_standards );
1032     free( p_sys->p_inputs );
1033     free( p_sys->p_tuners );
1034     free( p_sys->p_codecs );
1035     free( p_sys->psz_requested_chroma );
1036     free( p_sys->psz_set_ctrls );
1037
1038     free( p_sys );
1039 }
1040
1041 /*****************************************************************************
1042  * AccessOpen: opens v4l2 device, access callback
1043  *****************************************************************************
1044  *
1045  * url: <video device>::::
1046  *
1047  *****************************************************************************/
1048 static int AccessOpen( vlc_object_t * p_this )
1049 {
1050     access_t *p_access = (access_t*) p_this;
1051     demux_sys_t * p_sys;
1052
1053     /* Only when selected */
1054     if( *p_access->psz_access == '\0' ) return VLC_EGENERIC;
1055
1056     access_InitFields( p_access );
1057     ACCESS_SET_CALLBACKS( AccessRead, NULL, AccessControl, NULL );
1058     p_sys = calloc( 1, sizeof( demux_sys_t ));
1059     if( !p_sys ) return VLC_ENOMEM;
1060     p_access->p_sys = (access_sys_t*)p_sys;
1061
1062     GetV4L2Params( p_sys, (vlc_object_t *) p_access );
1063
1064     ParseMRL( p_sys, p_access->psz_path, (vlc_object_t *) p_access );
1065
1066 #ifdef HAVE_LIBV4L2
1067     if( !config_GetInt( p_this, CFG_PREFIX "use-libv4l2" ) )
1068     {
1069         msg_Dbg( p_this, "Trying direct kernel v4l2" );
1070         use_kernel_v4l2( p_sys );
1071         if( FindMainDevice( p_this, p_sys, false ) == VLC_SUCCESS)
1072             return VLC_SUCCESS;
1073     }
1074
1075     msg_Dbg( p_this, "Trying libv4l2 wrapper" );
1076     use_libv4l2( p_sys );
1077 #endif
1078     if( FindMainDevice( p_this, p_sys, false ) == VLC_SUCCESS )
1079         return VLC_SUCCESS;
1080
1081     AccessClose( p_this );
1082     return VLC_EGENERIC;
1083 }
1084
1085 /*****************************************************************************
1086  * DemuxControl:
1087  *****************************************************************************/
1088 static int DemuxControl( demux_t *p_demux, int i_query, va_list args )
1089 {
1090     switch( i_query )
1091     {
1092         /* Special for access_demux */
1093         case DEMUX_CAN_PAUSE:
1094         case DEMUX_CAN_SEEK:
1095         case DEMUX_SET_PAUSE_STATE:
1096         case DEMUX_CAN_CONTROL_PACE:
1097             *va_arg( args, bool * ) = false;
1098             return VLC_SUCCESS;
1099
1100         case DEMUX_GET_PTS_DELAY:
1101             *va_arg(args,int64_t *) = (int64_t)p_demux->p_sys->i_cache*1000;
1102             return VLC_SUCCESS;
1103
1104         case DEMUX_GET_TIME:
1105             *va_arg( args, int64_t * ) = mdate();
1106             return VLC_SUCCESS;
1107
1108         /* TODO implement others */
1109         default:
1110             return VLC_EGENERIC;
1111     }
1112
1113     return VLC_EGENERIC;
1114 }
1115
1116 /*****************************************************************************
1117  * AccessControl: access callback
1118  *****************************************************************************/
1119 static int AccessControl( access_t *p_access, int i_query, va_list args )
1120 {
1121     demux_sys_t  *p_sys = (demux_sys_t *) p_access->p_sys;
1122
1123     switch( i_query )
1124     {
1125         /* */
1126         case ACCESS_CAN_SEEK:
1127         case ACCESS_CAN_FASTSEEK:
1128         case ACCESS_CAN_PAUSE:
1129         case ACCESS_CAN_CONTROL_PACE:
1130             *va_arg( args, bool* ) = false;
1131             break;
1132
1133         /* */
1134         case ACCESS_GET_PTS_DELAY:
1135             *va_arg(args,int64_t *) = (int64_t)p_sys->i_cache*1000;
1136             break;
1137
1138         /* */
1139         case ACCESS_SET_PAUSE_STATE:
1140             /* Nothing to do */
1141             break;
1142
1143         case ACCESS_GET_TITLE_INFO:
1144         case ACCESS_SET_TITLE:
1145         case ACCESS_SET_SEEKPOINT:
1146         case ACCESS_SET_PRIVATE_ID_STATE:
1147         case ACCESS_GET_CONTENT_TYPE:
1148         case ACCESS_GET_META:
1149             return VLC_EGENERIC;
1150
1151         default:
1152             msg_Warn( p_access, "Unimplemented query in control(%d).", i_query);
1153             return VLC_EGENERIC;
1154
1155     }
1156     return VLC_SUCCESS;
1157 }
1158
1159 /*****************************************************************************
1160  * AccessRead: access callback
1161  ******************************************************************************/
1162 static ssize_t AccessRead( access_t * p_access, uint8_t * p_buffer, size_t i_len )
1163 {
1164     demux_sys_t *p_sys = (demux_sys_t *) p_access->p_sys;
1165     struct pollfd ufd;
1166     int i_ret;
1167
1168     ufd.fd = p_sys->i_fd;
1169     ufd.events = POLLIN;
1170
1171     if( p_access->info.b_eof )
1172         return 0;
1173
1174     do
1175     {
1176         if( !vlc_object_alive (p_access) )
1177             return 0;
1178
1179         ufd.revents = 0;
1180     }
1181     while( ( i_ret = poll( &ufd, 1, 500 ) ) == 0 );
1182
1183     if( i_ret < 0 )
1184     {
1185         msg_Err( p_access, "Polling error (%m)." );
1186         return -1;
1187     }
1188
1189     i_ret = v4l2_read( p_sys->i_fd, p_buffer, i_len );
1190     if( i_ret == 0 )
1191     {
1192         p_access->info.b_eof = true;
1193     }
1194     else if( i_ret > 0 )
1195     {
1196         p_access->info.i_pos += i_ret;
1197     }
1198
1199     return i_ret;
1200 }
1201
1202 /*****************************************************************************
1203  * Demux: Processes the audio or video frame
1204  *****************************************************************************/
1205 static int Demux( demux_t *p_demux )
1206 {
1207     demux_sys_t *p_sys = p_demux->p_sys;
1208
1209     struct pollfd fd;
1210     fd.fd = p_sys->i_fd;
1211     fd.events = POLLIN|POLLPRI;
1212     fd.revents = 0;
1213
1214     /* Wait for data */
1215     if( poll( &fd, 1, 500 ) ) /* Timeout after 0.5 seconds since I don't know if pf_demux can be blocking. */
1216     {
1217         if( fd.revents & (POLLIN|POLLPRI) )
1218         {
1219             block_t *p_block = GrabVideo( p_demux );
1220             if( p_block )
1221             {
1222                 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
1223                 es_out_Send( p_demux->out, p_sys->p_es, p_block );
1224             }
1225         }
1226     }
1227
1228     return 1;
1229 }
1230
1231 /*****************************************************************************
1232  * GrabVideo: Grab a video frame
1233  *****************************************************************************/
1234 static block_t* GrabVideo( demux_t *p_demux )
1235 {
1236     demux_sys_t *p_sys = p_demux->p_sys;
1237
1238     block_t *p_block = NULL;
1239     struct v4l2_buffer buf;
1240     ssize_t i_ret;
1241
1242     if( p_sys->f_fps >= 0.1 && p_sys->i_video_pts > 0 )
1243     {
1244         mtime_t i_dur = (mtime_t)((double)1000000 / (double)p_sys->f_fps);
1245
1246         /* Did we wait long enough ? (frame rate reduction) */
1247         if( p_sys->i_video_pts + i_dur > mdate() ) return 0;
1248     }
1249
1250     /* Grab Video Frame */
1251     switch( p_sys->io )
1252     {
1253     case IO_METHOD_READ:
1254         i_ret = v4l2_read( p_sys->i_fd, p_sys->p_buffers[0].start, p_sys->p_buffers[0].length );
1255         if( i_ret == -1 )
1256         {
1257             switch( errno )
1258             {
1259             case EAGAIN:
1260                 return 0;
1261             case EIO:
1262                 /* Could ignore EIO, see spec. */
1263                 /* fall through */
1264             default:
1265                 msg_Err( p_demux, "Failed to read frame" );
1266                 return 0;
1267                }
1268         }
1269
1270         p_block = ProcessVideoFrame( p_demux, (uint8_t*)p_sys->p_buffers[0].start, i_ret );
1271         if( !p_block ) return 0;
1272
1273         break;
1274
1275     case IO_METHOD_MMAP:
1276         memset( &buf, 0, sizeof(buf) );
1277         buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1278         buf.memory = V4L2_MEMORY_MMAP;
1279
1280         /* Wait for next frame */
1281         if (v4l2_ioctl( p_sys->i_fd, VIDIOC_DQBUF, &buf ) < 0 )
1282         {
1283             switch( errno )
1284             {
1285             case EAGAIN:
1286                 return 0;
1287             case EIO:
1288                 /* Could ignore EIO, see spec. */
1289                 /* fall through */
1290             default:
1291                 msg_Err( p_demux, "Failed to wait (VIDIOC_DQBUF)" );
1292                 return 0;
1293                }
1294         }
1295
1296         if( buf.index >= p_sys->i_nbuffers ) {
1297             msg_Err( p_demux, "Failed capturing new frame as i>=nbuffers" );
1298             return 0;
1299         }
1300
1301         p_block = ProcessVideoFrame( p_demux, p_sys->p_buffers[buf.index].start, buf.bytesused );
1302         if( !p_block ) return 0;
1303
1304         /* Unlock */
1305         if( v4l2_ioctl( p_sys->i_fd, VIDIOC_QBUF, &buf ) < 0 )
1306         {
1307             msg_Err( p_demux, "Failed to unlock (VIDIOC_QBUF)" );
1308             block_Release( p_block );
1309             return 0;
1310         }
1311
1312         break;
1313
1314     case IO_METHOD_USERPTR:
1315         memset( &buf, 0, sizeof(buf) );
1316         buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1317         buf.memory = V4L2_MEMORY_USERPTR;
1318
1319         /* Wait for next frame */
1320         if (v4l2_ioctl( p_sys->i_fd, VIDIOC_DQBUF, &buf ) < 0 )
1321         {
1322             switch( errno )
1323             {
1324             case EAGAIN:
1325                 return 0;
1326             case EIO:
1327                 /* Could ignore EIO, see spec. */
1328                 /* fall through */
1329             default:
1330                 msg_Err( p_demux, "Failed to wait (VIDIOC_DQBUF)" );
1331                 return 0;
1332             }
1333         }
1334
1335         /* Find frame? */
1336         unsigned int i;
1337         for( i = 0; i < p_sys->i_nbuffers; i++ )
1338         {
1339             if( buf.m.userptr == (unsigned long)p_sys->p_buffers[i].start &&
1340                 buf.length == p_sys->p_buffers[i].length ) break;
1341         }
1342
1343         if( i >= p_sys->i_nbuffers )
1344         {
1345             msg_Err( p_demux, "Failed capturing new frame as i>=nbuffers" );
1346             return 0;
1347         }
1348
1349         p_block = ProcessVideoFrame( p_demux, (uint8_t*)buf.m.userptr, buf.bytesused );
1350         if( !p_block ) return 0;
1351
1352         /* Unlock */
1353         if( v4l2_ioctl( p_sys->i_fd, VIDIOC_QBUF, &buf ) < 0 )
1354         {
1355             msg_Err( p_demux, "Failed to unlock (VIDIOC_QBUF)" );
1356             block_Release( p_block );
1357             return 0;
1358         }
1359
1360         break;
1361
1362     }
1363
1364     /* Timestamp */
1365     p_sys->i_video_pts = p_block->i_pts = p_block->i_dts = mdate();
1366
1367     return p_block;
1368 }
1369
1370 /*****************************************************************************
1371  * ProcessVideoFrame: Helper function to take a buffer and copy it into
1372  * a new block
1373  *****************************************************************************/
1374 static block_t* ProcessVideoFrame( demux_t *p_demux, uint8_t *p_frame, size_t i_size )
1375 {
1376     block_t *p_block;
1377
1378     if( !p_frame ) return 0;
1379
1380     /* New block */
1381     if( !( p_block = block_New( p_demux, i_size ) ) )
1382     {
1383         msg_Warn( p_demux, "Cannot get new block" );
1384         return 0;
1385     }
1386
1387     /* Copy frame */
1388     memcpy( p_block->p_buffer, p_frame, i_size );
1389
1390     return p_block;
1391 }
1392
1393 /*****************************************************************************
1394  * Helper function to initalise video IO using the Read method
1395  *****************************************************************************/
1396 static int InitRead( demux_t *p_demux, unsigned int i_buffer_size )
1397 {
1398     demux_sys_t *p_sys = p_demux->p_sys;
1399
1400     p_sys->p_buffers = calloc( 1, sizeof( *p_sys->p_buffers ) );
1401     if( !p_sys->p_buffers )
1402         return VLC_EGENERIC;
1403
1404     p_sys->p_buffers[0].length = i_buffer_size;
1405     p_sys->p_buffers[0].start = malloc( i_buffer_size );
1406     if( !p_sys->p_buffers[0].start )
1407         return VLC_ENOMEM;
1408
1409     return VLC_SUCCESS;
1410 }
1411
1412 /*****************************************************************************
1413  * Helper function to initalise video IO using the mmap method
1414  *****************************************************************************/
1415 static int InitMmap( demux_t *p_demux, int i_fd )
1416 {
1417     demux_sys_t *p_sys = p_demux->p_sys;
1418     struct v4l2_requestbuffers req;
1419
1420     memset( &req, 0, sizeof(req) );
1421     req.count = 4;
1422     req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1423     req.memory = V4L2_MEMORY_MMAP;
1424
1425     if( v4l2_ioctl( i_fd, VIDIOC_REQBUFS, &req ) < 0 )
1426     {
1427         msg_Err( p_demux, "device does not support mmap i/o" );
1428         goto open_failed;
1429     }
1430
1431     if( req.count < 2 )
1432     {
1433         msg_Err( p_demux, "Insufficient buffer memory" );
1434         goto open_failed;
1435     }
1436
1437     p_sys->p_buffers = calloc( req.count, sizeof( *p_sys->p_buffers ) );
1438     if( !p_sys->p_buffers )
1439         goto open_failed;
1440
1441     for( p_sys->i_nbuffers = 0; p_sys->i_nbuffers < req.count; ++p_sys->i_nbuffers )
1442     {
1443         struct v4l2_buffer buf;
1444
1445         memset( &buf, 0, sizeof(buf) );
1446         buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1447         buf.memory = V4L2_MEMORY_MMAP;
1448         buf.index = p_sys->i_nbuffers;
1449
1450         if( v4l2_ioctl( i_fd, VIDIOC_QUERYBUF, &buf ) < 0 )
1451         {
1452             msg_Err( p_demux, "VIDIOC_QUERYBUF" );
1453             goto open_failed;
1454         }
1455
1456         p_sys->p_buffers[p_sys->i_nbuffers].length = buf.length;
1457         p_sys->p_buffers[p_sys->i_nbuffers].start =
1458             v4l2_mmap( NULL, buf.length, PROT_READ | PROT_WRITE, MAP_SHARED, i_fd, buf.m.offset );
1459
1460         if( p_sys->p_buffers[p_sys->i_nbuffers].start == MAP_FAILED )
1461         {
1462             msg_Err( p_demux, "mmap failed (%m)" );
1463             goto open_failed;
1464         }
1465     }
1466
1467     return VLC_SUCCESS;
1468
1469 open_failed:
1470     return VLC_EGENERIC;
1471
1472 }
1473
1474 /*****************************************************************************
1475  * Helper function to initalise video IO using the userbuf method
1476  *****************************************************************************/
1477 static int InitUserP( demux_t *p_demux, int i_fd, unsigned int i_buffer_size )
1478 {
1479     demux_sys_t *p_sys = p_demux->p_sys;
1480     struct v4l2_requestbuffers req;
1481     unsigned int i_page_size;
1482
1483     i_page_size = sysconf(_SC_PAGESIZE);
1484     i_buffer_size = ( i_buffer_size + i_page_size - 1 ) & ~( i_page_size - 1);
1485
1486     memset( &req, 0, sizeof(req) );
1487     req.count = 4;
1488     req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1489     req.memory = V4L2_MEMORY_USERPTR;
1490
1491     if( v4l2_ioctl( i_fd, VIDIOC_REQBUFS, &req ) < 0 )
1492     {
1493         msg_Err( p_demux, "device does not support user pointer i/o" );
1494         return VLC_EGENERIC;
1495     }
1496
1497     p_sys->p_buffers = calloc( 4, sizeof( *p_sys->p_buffers ) );
1498     if( !p_sys->p_buffers )
1499         goto open_failed;
1500
1501     for( p_sys->i_nbuffers = 0; p_sys->i_nbuffers < 4; ++p_sys->i_nbuffers )
1502     {
1503         p_sys->p_buffers[p_sys->i_nbuffers].length = i_buffer_size;
1504         if( posix_memalign( &p_sys->p_buffers[p_sys->i_nbuffers].start,
1505                 /* boundary */ i_page_size, i_buffer_size ) )
1506             goto open_failed;
1507     }
1508
1509     return VLC_SUCCESS;
1510
1511 open_failed:
1512     free( p_sys->p_buffers );
1513     return VLC_EGENERIC;
1514
1515 }
1516
1517 /*****************************************************************************
1518  * IsPixelFormatSupported: returns true if the specified V4L2 pixel format is
1519  * in the array of supported formats returned by the driver
1520  *****************************************************************************/
1521 static bool IsPixelFormatSupported( demux_t *p_demux, unsigned int i_pixelformat )
1522 {
1523     demux_sys_t *p_sys = p_demux->p_sys;
1524
1525     for( int i_index = 0; i_index < p_sys->i_codec; i_index++ )
1526     {
1527         if( p_sys->p_codecs[i_index].pixelformat == i_pixelformat )
1528             return true;
1529     }
1530
1531     return false;
1532 }
1533
1534 static float GetMaxFrameRate( demux_t *p_demux, int i_fd,
1535                               uint32_t i_pixel_format,
1536                               uint32_t i_width, uint32_t i_height )
1537 {
1538     (void)p_demux;
1539 #ifdef VIDIOC_ENUM_FRAMEINTERVALS
1540 #ifdef HAVE_LIBV4L2
1541     demux_sys_t *p_sys = p_demux->p_sys;
1542 #endif
1543     /* This is new in Linux 2.6.19 */
1544     struct v4l2_frmivalenum frmival;
1545     memset( &frmival, 0, sizeof(frmival) );
1546     frmival.pixel_format = i_pixel_format;
1547     frmival.width = i_width;
1548     frmival.height = i_height;
1549     if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMEINTERVALS, &frmival ) >= 0 )
1550     {
1551         switch( frmival.type )
1552         {
1553             case V4L2_FRMIVAL_TYPE_DISCRETE:
1554             {
1555                 float f_fps_max = -1;
1556                 do
1557                 {
1558                     float f_fps = (float)frmival.discrete.denominator
1559                                 / (float)frmival.discrete.numerator;
1560                     if( f_fps > f_fps_max ) f_fps_max = f_fps;
1561                     frmival.index++;
1562                 } while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMEINTERVALS,
1563                                      &frmival ) >= 0 );
1564                 return f_fps_max;
1565             }
1566             case V4L2_FRMSIZE_TYPE_STEPWISE:
1567             case V4L2_FRMIVAL_TYPE_CONTINUOUS:
1568                 return __MAX( (float)frmival.stepwise.max.denominator
1569                             / (float)frmival.stepwise.max.numerator,
1570                               (float)frmival.stepwise.min.denominator
1571                             / (float)frmival.stepwise.min.numerator );
1572         }
1573     }
1574 #endif
1575     return -1.;
1576 }
1577
1578 static float GetAbsoluteMaxFrameRate( demux_t *p_demux, int i_fd,
1579                                       uint32_t i_pixel_format )
1580 {
1581     float f_fps_max = -1.;
1582 #ifdef VIDIOC_ENUM_FRAMESIZES
1583 #ifdef HAVE_LIBV4L2
1584     demux_sys_t *p_sys = p_demux->p_sys;
1585 #endif
1586     /* This is new in Linux 2.6.19 */
1587     struct v4l2_frmsizeenum frmsize;
1588     memset( &frmsize, 0, sizeof(frmsize) );
1589     frmsize.pixel_format = i_pixel_format;
1590     if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES, &frmsize ) >= 0 )
1591     {
1592         switch( frmsize.type )
1593         {
1594             case V4L2_FRMSIZE_TYPE_DISCRETE:
1595                 do
1596                 {
1597                     frmsize.index++;
1598                     float f_fps = GetMaxFrameRate( p_demux, i_fd,
1599                                                    i_pixel_format,
1600                                                    frmsize.discrete.width,
1601                                                    frmsize.discrete.height );
1602                     if( f_fps > f_fps_max ) f_fps_max = f_fps;
1603                 } while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES,
1604                          &frmsize ) >= 0 );
1605                 break;
1606             case V4L2_FRMSIZE_TYPE_STEPWISE:
1607             {
1608                 uint32_t i_width = frmsize.stepwise.min_width;
1609                 uint32_t i_height = frmsize.stepwise.min_height;
1610                 for( ;
1611                      i_width <= frmsize.stepwise.max_width &&
1612                      i_height <= frmsize.stepwise.max_width;
1613                      i_width += frmsize.stepwise.step_width,
1614                      i_height += frmsize.stepwise.step_height )
1615                 {
1616                     float f_fps = GetMaxFrameRate( p_demux, i_fd,
1617                                                    i_pixel_format,
1618                                                    i_width, i_height );
1619                     if( f_fps > f_fps_max ) f_fps_max = f_fps;
1620                 }
1621                 break;
1622             }
1623             case V4L2_FRMSIZE_TYPE_CONTINUOUS:
1624                 /* FIXME */
1625                 msg_Err( p_demux, "GetAbsoluteMaxFrameRate implementation for V4L2_FRMSIZE_TYPE_CONTINUOUS isn't correct" );
1626                  f_fps_max = GetMaxFrameRate( p_demux, i_fd,
1627                                               i_pixel_format,
1628                                               frmsize.stepwise.max_width,
1629                                               frmsize.stepwise.max_height );
1630                 break;
1631         }
1632     }
1633 #endif
1634     return f_fps_max;
1635 }
1636
1637 static void GetMaxDimensions( demux_t *p_demux, int i_fd,
1638                               uint32_t i_pixel_format, float f_fps_min,
1639                               uint32_t *pi_width, uint32_t *pi_height )
1640 {
1641     *pi_width = 0;
1642     *pi_height = 0;
1643 #ifdef VIDIOC_ENUM_FRAMESIZES
1644 #ifdef HAVE_LIBV4L2
1645     demux_sys_t *p_sys = p_demux->p_sys;
1646 #endif
1647     /* This is new in Linux 2.6.19 */
1648     struct v4l2_frmsizeenum frmsize;
1649     memset( &frmsize, 0, sizeof(frmsize) );
1650     frmsize.pixel_format = i_pixel_format;
1651     if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES, &frmsize ) >= 0 )
1652     {
1653         switch( frmsize.type )
1654         {
1655             case V4L2_FRMSIZE_TYPE_DISCRETE:
1656                 do
1657                 {
1658                     frmsize.index++;
1659                     float f_fps = GetMaxFrameRate( p_demux, i_fd,
1660                                                    i_pixel_format,
1661                                                    frmsize.discrete.width,
1662                                                    frmsize.discrete.height );
1663                     if( f_fps >= f_fps_min &&
1664                         frmsize.discrete.width > *pi_width )
1665                     {
1666                         *pi_width = frmsize.discrete.width;
1667                         *pi_height = frmsize.discrete.height;
1668                     }
1669                 } while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES,
1670                          &frmsize ) >= 0 );
1671                 break;
1672             case V4L2_FRMSIZE_TYPE_STEPWISE:
1673             {
1674                 uint32_t i_width = frmsize.stepwise.min_width;
1675                 uint32_t i_height = frmsize.stepwise.min_height;
1676                 for( ;
1677                      i_width <= frmsize.stepwise.max_width &&
1678                      i_height <= frmsize.stepwise.max_width;
1679                      i_width += frmsize.stepwise.step_width,
1680                      i_height += frmsize.stepwise.step_height )
1681                 {
1682                     float f_fps = GetMaxFrameRate( p_demux, i_fd,
1683                                                    i_pixel_format,
1684                                                    i_width, i_height );
1685                     if( f_fps >= f_fps_min && i_width > *pi_width )
1686                     {
1687                         *pi_width = i_width;
1688                         *pi_height = i_height;
1689                     }
1690                 }
1691                 break;
1692             }
1693             case V4L2_FRMSIZE_TYPE_CONTINUOUS:
1694                 /* FIXME */
1695                 msg_Err( p_demux, "GetMaxDimension implementation for V4L2_FRMSIZE_TYPE_CONTINUOUS isn't correct" );
1696                 float f_fps = GetMaxFrameRate( p_demux, i_fd,
1697                                                i_pixel_format,
1698                                                frmsize.stepwise.max_width,
1699                                                frmsize.stepwise.max_height );
1700                 if( f_fps >= f_fps_min &&
1701                     frmsize.stepwise.max_width > *pi_width )
1702                 {
1703                     *pi_width = frmsize.stepwise.max_width;
1704                     *pi_height = frmsize.stepwise.max_height;
1705                 }
1706                 break;
1707         }
1708     }
1709 #endif
1710 }
1711
1712 /*****************************************************************************
1713  * OpenVideoDev: open and set up the video device and probe for capabilities
1714  *****************************************************************************/
1715 static int OpenVideoDev( vlc_object_t *p_obj, demux_sys_t *p_sys, bool b_demux )
1716 {
1717     int i_fd;
1718     struct v4l2_cropcap cropcap;
1719     struct v4l2_crop crop;
1720     struct v4l2_format fmt;
1721     unsigned int i_min;
1722     enum v4l2_buf_type buf_type;
1723     const char *psz_device = p_sys->psz_device;
1724     es_format_t es_fmt;
1725
1726     if( ( i_fd = open( psz_device, O_RDWR ) ) < 0 )
1727     {
1728         msg_Err( p_obj, "cannot open device (%m)" );
1729         goto open_failed;
1730     }
1731
1732 #ifdef HAVE_LIBV4L2
1733     /* Note the v4l2_xxx functions are designed so that if they get passed an
1734        unknown fd, the will behave exactly as their regular xxx counterparts,
1735        so if v4l2_fd_open fails, we continue as normal (missing the libv4l2
1736        custom cam format to normal formats conversion). Chances are big we will
1737        still fail then though, as normally v4l2_fd_open only fails if the
1738        device is not a v4l2 device. */
1739     if( p_sys->b_libv4l2 )
1740     {
1741         int libv4l2_fd;
1742         libv4l2_fd = v4l2_fd_open( i_fd, V4L2_ENABLE_ENUM_FMT_EMULATION );
1743         if( libv4l2_fd != -1 )
1744             i_fd = libv4l2_fd;
1745     }
1746 #endif
1747
1748     /* Tune the tuner */
1749     if( p_sys->i_frequency >= 0 )
1750     {
1751         if( p_sys->i_cur_tuner < 0 || p_sys->i_cur_tuner >= p_sys->i_tuner )
1752         {
1753             msg_Err( p_obj, "invalid tuner %d.", p_sys->i_cur_tuner );
1754             goto open_failed;
1755         }
1756         struct v4l2_frequency frequency;
1757         memset( &frequency, 0, sizeof( frequency ) );
1758         frequency.tuner = p_sys->i_cur_tuner;
1759         frequency.type = p_sys->p_tuners[p_sys->i_cur_tuner].type;
1760         frequency.frequency = p_sys->i_frequency / 62.5;
1761         if( v4l2_ioctl( i_fd, VIDIOC_S_FREQUENCY, &frequency ) < 0 )
1762         {
1763             msg_Err( p_obj, "cannot set tuner frequency (%m)" );
1764             goto open_failed;
1765         }
1766         msg_Dbg( p_obj, "Tuner frequency set" );
1767     }
1768
1769     /* Set the tuner's audio mode */
1770     if( p_sys->i_audio_mode >= 0 )
1771     {
1772         if( p_sys->i_cur_tuner < 0 || p_sys->i_cur_tuner >= p_sys->i_tuner )
1773         {
1774             msg_Err( p_obj, "invalid tuner %d.", p_sys->i_cur_tuner );
1775             goto open_failed;
1776         }
1777         struct v4l2_tuner tuner;
1778         memset( &tuner, 0, sizeof( tuner ) );
1779         tuner.index = p_sys->i_cur_tuner;
1780         tuner.audmode = p_sys->i_audio_mode;
1781         if( v4l2_ioctl( i_fd, VIDIOC_S_TUNER, &tuner ) < 0 )
1782         {
1783             msg_Err( p_obj, "cannot set tuner audio mode (%m)" );
1784             goto open_failed;
1785         }
1786         msg_Dbg( p_obj, "Tuner audio mode set" );
1787     }
1788
1789     /* Select standard */
1790
1791     if( p_sys->i_selected_standard_id != V4L2_STD_UNKNOWN )
1792     {
1793         if( v4l2_ioctl( i_fd, VIDIOC_S_STD, &p_sys->i_selected_standard_id ) < 0 )
1794         {
1795             msg_Err( p_obj, "cannot set standard (%m)" );
1796             goto open_failed;
1797         }
1798         msg_Dbg( p_obj, "Set standard" );
1799     }
1800
1801     /* Select input */
1802
1803     if( p_sys->i_selected_input >= p_sys->i_input )
1804     {
1805         msg_Warn( p_obj, "invalid input. Using the default one" );
1806         p_sys->i_selected_input = 0;
1807     }
1808
1809     if( v4l2_ioctl( i_fd, VIDIOC_S_INPUT, &p_sys->i_selected_input ) < 0 )
1810     {
1811         msg_Err( p_obj, "cannot set input (%m)" );
1812         goto open_failed;
1813     }
1814
1815     /* Set audio input */
1816
1817     if( p_sys->i_audio > 0 )
1818     {
1819         if( p_sys->i_selected_audio_input < 0
1820          || p_sys->i_selected_audio_input >= p_sys->i_audio )
1821         {
1822             msg_Warn( p_obj, "invalid audio input. Using the default one" );
1823             p_sys->i_selected_audio_input = 0;
1824         }
1825
1826         if( v4l2_ioctl( i_fd, VIDIOC_S_AUDIO, &p_sys->p_audios[p_sys->i_selected_audio_input] ) < 0 )
1827         {
1828             msg_Err( p_obj, "cannot set audio input (%m)" );
1829             goto open_failed;
1830         }
1831         msg_Dbg( p_obj, "Audio input set to %d", p_sys->i_selected_audio_input );
1832     }
1833
1834
1835     /* TODO: Move the resolution stuff up here */
1836     /* if MPEG encoder card, no need to do anything else after this */
1837     ControlList( p_obj, p_sys, i_fd,
1838                   var_GetBool( p_obj, "v4l2-controls-reset" ), b_demux );
1839     SetAvailControlsByString( p_obj, p_sys, i_fd );
1840
1841     if( false == b_demux)
1842     {
1843         return i_fd;
1844     }
1845
1846     demux_t *p_demux = (demux_t *) p_obj;
1847
1848     /* Verify device support for the various IO methods */
1849     switch( p_sys->io )
1850     {
1851         case IO_METHOD_READ:
1852             if( !(p_sys->dev_cap.capabilities & V4L2_CAP_READWRITE) )
1853             {
1854                 msg_Err( p_obj, "device does not support read i/o" );
1855                 goto open_failed;
1856             }
1857             break;
1858
1859         case IO_METHOD_MMAP:
1860         case IO_METHOD_USERPTR:
1861             if( !(p_sys->dev_cap.capabilities & V4L2_CAP_STREAMING) )
1862             {
1863                 msg_Err( p_obj, "device does not support streaming i/o" );
1864                 goto open_failed;
1865             }
1866             break;
1867
1868         default:
1869             msg_Err( p_obj, "io method not supported" );
1870             goto open_failed;
1871     }
1872
1873     /* Reset Cropping */
1874     memset( &cropcap, 0, sizeof(cropcap) );
1875     cropcap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1876     if( v4l2_ioctl( i_fd, VIDIOC_CROPCAP, &cropcap ) >= 0 )
1877     {
1878         crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1879         crop.c = cropcap.defrect; /* reset to default */
1880         if( v4l2_ioctl( i_fd, VIDIOC_S_CROP, &crop ) < 0 )
1881         {
1882             switch( errno )
1883             {
1884                 case EINVAL:
1885                     /* Cropping not supported. */
1886                     break;
1887                 default:
1888                     /* Errors ignored. */
1889                     break;
1890             }
1891         }
1892     }
1893
1894     /* Try and find default resolution if not specified */
1895     memset( &fmt, 0, sizeof(fmt) );
1896     fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1897
1898     if( p_sys->i_width == 0 || p_sys->i_height == 0 )
1899     {
1900         /* Use current width and height settings */
1901         if( v4l2_ioctl( i_fd, VIDIOC_G_FMT, &fmt ) < 0 )
1902         {
1903             msg_Err( p_demux, "Cannot get default width and height." );
1904             goto open_failed;
1905         }
1906
1907         p_sys->i_width = fmt.fmt.pix.width;
1908         p_sys->i_height = fmt.fmt.pix.height;
1909
1910         if( fmt.fmt.pix.field == V4L2_FIELD_ALTERNATE )
1911         {
1912             p_sys->i_height = p_sys->i_height * 2;
1913         }
1914     }
1915     else if( p_sys->i_width < 0 || p_sys->i_height < 0 )
1916     {
1917         msg_Dbg( p_demux, "will try to find optimal width and height." );
1918     }
1919     else
1920     {
1921         /* Use user specified width and height */
1922         msg_Dbg( p_demux, "trying specified size %dx%d", p_sys->i_width, p_sys->i_height );
1923     }
1924
1925     fmt.fmt.pix.width = p_sys->i_width;
1926     fmt.fmt.pix.height = p_sys->i_height;
1927     fmt.fmt.pix.field = V4L2_FIELD_NONE;
1928
1929     /* Test and set Chroma */
1930     fmt.fmt.pix.pixelformat = 0;
1931     if( p_sys->psz_requested_chroma && *p_sys->psz_requested_chroma )
1932     {
1933         /* User specified chroma */
1934         const vlc_fourcc_t i_requested_fourcc =
1935             vlc_fourcc_GetCodecFromString( VIDEO_ES, p_sys->psz_requested_chroma );
1936
1937         for( int i = 0; v4l2chroma_to_fourcc[i].i_v4l2 != 0; i++ )
1938         {
1939             if( v4l2chroma_to_fourcc[i].i_fourcc == i_requested_fourcc )
1940             {
1941                 fmt.fmt.pix.pixelformat = v4l2chroma_to_fourcc[i].i_v4l2;
1942                 break;
1943             }
1944         }
1945         /* Try and set user chroma */
1946         if( !IsPixelFormatSupported( p_demux, fmt.fmt.pix.pixelformat ) || ( fmt.fmt.pix.pixelformat && v4l2_ioctl( i_fd, VIDIOC_S_FMT, &fmt ) < 0 ) )
1947         {
1948             msg_Warn( p_demux, "Driver is unable to use specified chroma %s. Trying defaults.", p_sys->psz_requested_chroma );
1949             fmt.fmt.pix.pixelformat = 0;
1950         }
1951     }
1952
1953     /* If no user specified chroma, find best */
1954     /* This also decides if MPEG encoder card or not */
1955     if( !fmt.fmt.pix.pixelformat )
1956     {
1957         unsigned int i;
1958         for( i = 0; i < ARRAY_SIZE( p_chroma_fallbacks ); i++ )
1959         {
1960             fmt.fmt.pix.pixelformat = p_chroma_fallbacks[i];
1961             if( IsPixelFormatSupported( p_demux, fmt.fmt.pix.pixelformat )
1962              && v4l2_ioctl( i_fd, VIDIOC_S_FMT, &fmt ) >= 0 )
1963                 break;
1964         }
1965         if( i == ARRAY_SIZE( p_chroma_fallbacks ) )
1966         {
1967             msg_Warn( p_demux, "Could not select any of the default chromas; attempting to open as MPEG encoder card (access)" );
1968             goto open_failed;
1969         }
1970     }
1971
1972     if( p_sys->i_width < 0 || p_sys->i_height < 0 )
1973     {
1974         if( p_sys->f_fps <= 0 )
1975         {
1976             p_sys->f_fps = GetAbsoluteMaxFrameRate( p_demux, i_fd,
1977                                                     fmt.fmt.pix.pixelformat );
1978             msg_Dbg( p_demux, "Found maximum framerate of %f", p_sys->f_fps );
1979         }
1980         GetMaxDimensions( p_demux, i_fd,
1981                           fmt.fmt.pix.pixelformat, p_sys->f_fps,
1982                           &fmt.fmt.pix.width, &fmt.fmt.pix.height );
1983         msg_Dbg( p_demux, "Found optimal dimensions for framerate %f of %dx%d",
1984                  p_sys->f_fps, fmt.fmt.pix.width, fmt.fmt.pix.height );
1985         if( v4l2_ioctl( i_fd, VIDIOC_S_FMT, &fmt ) < 0 ) {;}
1986     }
1987
1988     /* Reassign width, height and chroma incase driver override */
1989     p_sys->i_width = fmt.fmt.pix.width;
1990     p_sys->i_height = fmt.fmt.pix.height;
1991
1992     /* Check interlacing */
1993     if( v4l2_ioctl( i_fd, VIDIOC_G_FMT, &fmt ) < 0 ) {;}
1994     switch( fmt.fmt.pix.field )
1995     {
1996         case V4L2_FIELD_NONE:
1997             msg_Dbg( p_demux, "Interlacing setting: progressive" );
1998             break;
1999         case V4L2_FIELD_TOP:
2000             msg_Dbg( p_demux, "Interlacing setting: top field only" );
2001             break;
2002         case V4L2_FIELD_BOTTOM:
2003             msg_Dbg( p_demux, "Interlacing setting: bottom field only" );
2004             break;
2005         case V4L2_FIELD_INTERLACED:
2006             msg_Dbg( p_demux, "Interlacing setting: interleaved (bottom top if M/NTSC, top bottom otherwise)" );
2007             break;
2008         case V4L2_FIELD_SEQ_TB:
2009             msg_Dbg( p_demux, "Interlacing setting: sequential top bottom" );
2010             break;
2011         case V4L2_FIELD_SEQ_BT:
2012             msg_Dbg( p_demux, "Interlacing setting: sequential bottom top" );
2013             break;
2014         case V4L2_FIELD_ALTERNATE:
2015             msg_Dbg( p_demux, "Interlacing setting: alternate fields" );
2016             break;
2017         case V4L2_FIELD_INTERLACED_TB:
2018             msg_Dbg( p_demux, "Interlacing setting: interleaved top bottom" );
2019             break;
2020         case V4L2_FIELD_INTERLACED_BT:
2021             msg_Dbg( p_demux, "Interlacing setting: interleaved bottom top" );
2022             break;
2023         default:
2024             msg_Warn( p_demux, "Interlacing setting: unknown type (%d)",
2025                       fmt.fmt.pix.field );
2026             break;
2027     }
2028     if( fmt.fmt.pix.field != V4L2_FIELD_NONE )
2029         msg_Warn( p_demux, "Interlaced inputs haven't been tested. Please report any issue." );
2030
2031     /* Look up final fourcc */
2032     p_sys->i_fourcc = 0;
2033     for( int i = 0; v4l2chroma_to_fourcc[i].i_fourcc != 0; i++ )
2034     {
2035         if( v4l2chroma_to_fourcc[i].i_v4l2 == fmt.fmt.pix.pixelformat )
2036         {
2037             p_sys->i_fourcc = v4l2chroma_to_fourcc[i].i_fourcc;
2038             es_format_Init( &es_fmt, VIDEO_ES, p_sys->i_fourcc );
2039             es_fmt.video.i_rmask = v4l2chroma_to_fourcc[i].i_rmask;
2040             es_fmt.video.i_gmask = v4l2chroma_to_fourcc[i].i_gmask;
2041             es_fmt.video.i_bmask = v4l2chroma_to_fourcc[i].i_bmask;
2042             break;
2043         }
2044     }
2045
2046     /* Buggy driver paranoia */
2047     i_min = fmt.fmt.pix.width * 2;
2048     if( fmt.fmt.pix.bytesperline < i_min )
2049         fmt.fmt.pix.bytesperline = i_min;
2050     i_min = fmt.fmt.pix.bytesperline * fmt.fmt.pix.height;
2051     if( fmt.fmt.pix.sizeimage < i_min )
2052         fmt.fmt.pix.sizeimage = i_min;
2053
2054 #ifdef VIDIOC_ENUM_FRAMEINTERVALS
2055     /* This is new in Linux 2.6.19 */
2056     /* List supported frame rates */
2057     struct v4l2_frmivalenum frmival;
2058     memset( &frmival, 0, sizeof(frmival) );
2059     frmival.pixel_format = fmt.fmt.pix.pixelformat;
2060     frmival.width = p_sys->i_width;
2061     frmival.height = p_sys->i_height;
2062     if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMEINTERVALS, &frmival ) >= 0 )
2063     {
2064         char psz_fourcc[5];
2065         memset( &psz_fourcc, 0, sizeof( psz_fourcc ) );
2066         vlc_fourcc_to_char( p_sys->i_fourcc, &psz_fourcc );
2067         msg_Dbg( p_demux, "supported frame intervals for %4s, %dx%d:",
2068                  psz_fourcc, frmival.width, frmival.height );
2069         switch( frmival.type )
2070         {
2071             case V4L2_FRMIVAL_TYPE_DISCRETE:
2072                 do
2073                 {
2074                     msg_Dbg( p_demux, "    supported frame interval: %d/%d",
2075                              frmival.discrete.numerator,
2076                              frmival.discrete.denominator );
2077                     frmival.index++;
2078                 } while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMEINTERVALS, &frmival ) >= 0 );
2079                 break;
2080             case V4L2_FRMIVAL_TYPE_STEPWISE:
2081                 msg_Dbg( p_demux, "    supported frame intervals: %d/%d to "
2082                          "%d/%d using %d/%d increments",
2083                          frmival.stepwise.min.numerator,
2084                          frmival.stepwise.min.denominator,
2085                          frmival.stepwise.max.numerator,
2086                          frmival.stepwise.max.denominator,
2087                          frmival.stepwise.step.numerator,
2088                          frmival.stepwise.step.denominator );
2089                 break;
2090             case V4L2_FRMIVAL_TYPE_CONTINUOUS:
2091                 msg_Dbg( p_demux, "    supported frame intervals: %d/%d to %d/%d",
2092                          frmival.stepwise.min.numerator,
2093                          frmival.stepwise.min.denominator,
2094                          frmival.stepwise.max.numerator,
2095                          frmival.stepwise.max.denominator );
2096                 break;
2097         }
2098     }
2099 #endif
2100
2101
2102     /* Init IO method */
2103     switch( p_sys->io )
2104     {
2105     case IO_METHOD_READ:
2106         if( InitRead( p_demux, fmt.fmt.pix.sizeimage ) != VLC_SUCCESS ) goto open_failed;
2107         break;
2108
2109     case IO_METHOD_MMAP:
2110         if( InitMmap( p_demux, i_fd ) != VLC_SUCCESS ) goto open_failed;
2111         break;
2112
2113     case IO_METHOD_USERPTR:
2114         if( InitUserP( p_demux, i_fd, fmt.fmt.pix.sizeimage ) != VLC_SUCCESS ) goto open_failed;
2115         break;
2116
2117     }
2118
2119     /* Add */
2120     es_fmt.video.i_width  = p_sys->i_width;
2121     es_fmt.video.i_height = p_sys->i_height;
2122     es_fmt.video.i_aspect = 4 * VOUT_ASPECT_FACTOR / 3;
2123
2124     msg_Dbg( p_demux, "added new video es %4.4s %dx%d",
2125         (char*)&es_fmt.i_codec, es_fmt.video.i_width, es_fmt.video.i_height );
2126     p_sys->p_es = es_out_Add( p_demux->out, &es_fmt );
2127
2128     /* Start Capture */
2129
2130     switch( p_sys->io )
2131     {
2132     case IO_METHOD_READ:
2133         /* Nothing to do */
2134         break;
2135
2136     case IO_METHOD_MMAP:
2137         for (unsigned int i = 0; i < p_sys->i_nbuffers; ++i)
2138         {
2139             struct v4l2_buffer buf;
2140
2141             memset( &buf, 0, sizeof(buf) );
2142             buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2143             buf.memory = V4L2_MEMORY_MMAP;
2144             buf.index = i;
2145
2146             if( v4l2_ioctl( i_fd, VIDIOC_QBUF, &buf ) < 0 )
2147             {
2148                 msg_Err( p_demux, "VIDIOC_QBUF failed" );
2149                 goto open_failed;
2150             }
2151         }
2152
2153         buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2154         if( v4l2_ioctl( i_fd, VIDIOC_STREAMON, &buf_type ) < 0 )
2155         {
2156             msg_Err( p_demux, "VIDIOC_STREAMON failed" );
2157             goto open_failed;
2158         }
2159
2160         break;
2161
2162     case IO_METHOD_USERPTR:
2163         for( unsigned int i = 0; i < p_sys->i_nbuffers; ++i )
2164         {
2165             struct v4l2_buffer buf;
2166
2167             memset( &buf, 0, sizeof(buf) );
2168             buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2169             buf.memory = V4L2_MEMORY_USERPTR;
2170             buf.index = i;
2171             buf.m.userptr = (unsigned long)p_sys->p_buffers[i].start;
2172             buf.length = p_sys->p_buffers[i].length;
2173
2174             if( v4l2_ioctl( i_fd, VIDIOC_QBUF, &buf ) < 0 )
2175             {
2176                 msg_Err( p_demux, "VIDIOC_QBUF failed" );
2177                 goto open_failed;
2178             }
2179         }
2180
2181         buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2182         if( v4l2_ioctl( i_fd, VIDIOC_STREAMON, &buf_type ) < 0 )
2183         {
2184             msg_Err( p_demux, "VIDIOC_STREAMON failed" );
2185             goto open_failed;
2186         }
2187
2188         break;
2189     }
2190
2191     /* report fps */
2192     if( p_sys->f_fps >= 0.1 )
2193     {
2194         msg_Dbg( p_demux, "User set fps=%f", p_sys->f_fps );
2195     }
2196
2197     return i_fd;
2198
2199 open_failed:
2200     if( i_fd >= 0 ) v4l2_close( i_fd );
2201     return -1;
2202
2203 }
2204
2205 /*****************************************************************************
2206  * ProbeVideoDev: probe video for capabilities
2207  *****************************************************************************/
2208 static bool ProbeVideoDev( vlc_object_t *p_obj, demux_sys_t *p_sys,
2209                                  const char *psz_device )
2210 {
2211     int i_index;
2212     int i_standard;
2213
2214     int i_fd;
2215
2216     if( ( i_fd = open( psz_device, O_RDWR ) ) < 0 )
2217     {
2218         msg_Err( p_obj, "cannot open video device '%s' (%m)", psz_device );
2219         goto open_failed;
2220     }
2221
2222 #ifdef HAVE_LIBV4L2
2223     /* Note the v4l2_xxx functions are designed so that if they get passed an
2224        unknown fd, the will behave exactly as their regular xxx counterparts,
2225        so if v4l2_fd_open fails, we continue as normal (missing the libv4l2
2226        custom cam format to normal formats conversion). Chances are big we will
2227        still fail then though, as normally v4l2_fd_open only fails if the
2228        device is not a v4l2 device. */
2229     if( p_sys->b_libv4l2 )
2230     {
2231         int libv4l2_fd;
2232         libv4l2_fd = v4l2_fd_open( i_fd, V4L2_ENABLE_ENUM_FMT_EMULATION );
2233         if( libv4l2_fd != -1 )
2234             i_fd = libv4l2_fd;
2235     }
2236 #endif
2237
2238     /* Get device capabilites */
2239
2240     if( v4l2_ioctl( i_fd, VIDIOC_QUERYCAP, &p_sys->dev_cap ) < 0 )
2241     {
2242         msg_Err( p_obj, "cannot get video capabilities (%m)" );
2243         goto open_failed;
2244     }
2245
2246     msg_Dbg( p_obj, "V4L2 device: %s using driver: %s (version: %u.%u.%u) on %s",
2247                             p_sys->dev_cap.card,
2248                             p_sys->dev_cap.driver,
2249                             (p_sys->dev_cap.version >> 16) & 0xFF,
2250                             (p_sys->dev_cap.version >> 8) & 0xFF,
2251                             p_sys->dev_cap.version & 0xFF,
2252                             p_sys->dev_cap.bus_info );
2253
2254     msg_Dbg( p_obj, "the device has the capabilities: (%c) Video Capure, "
2255                                                        "(%c) Audio, "
2256                                                        "(%c) Tuner",
2257              ( p_sys->dev_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE  ? 'X':' '),
2258              ( p_sys->dev_cap.capabilities & V4L2_CAP_AUDIO  ? 'X':' '),
2259              ( p_sys->dev_cap.capabilities & V4L2_CAP_TUNER  ? 'X':' ') );
2260
2261     msg_Dbg( p_obj, "supported I/O methods are: (%c) Read/Write, "
2262                                                  "(%c) Streaming, "
2263                                                  "(%c) Asynchronous",
2264             ( p_sys->dev_cap.capabilities & V4L2_CAP_READWRITE ? 'X':' ' ),
2265             ( p_sys->dev_cap.capabilities & V4L2_CAP_STREAMING ? 'X':' ' ),
2266             ( p_sys->dev_cap.capabilities & V4L2_CAP_ASYNCIO ? 'X':' ' ) );
2267
2268     /* Now, enumerate all the video inputs. This is useless at the moment
2269        since we have no way to present that info to the user except with
2270        debug messages */
2271
2272     if( p_sys->dev_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE )
2273     {
2274         struct v4l2_input t_input;
2275         memset( &t_input, 0, sizeof(t_input) );
2276         while( v4l2_ioctl( i_fd, VIDIOC_ENUMINPUT, &t_input ) >= 0 )
2277         {
2278             p_sys->i_input++;
2279             t_input.index = p_sys->i_input;
2280         }
2281
2282         p_sys->p_inputs = calloc( 1, p_sys->i_input * sizeof( struct v4l2_input ) );
2283         if( !p_sys->p_inputs ) goto open_failed;
2284
2285         for( i_index = 0; i_index < p_sys->i_input; i_index++ )
2286         {
2287             p_sys->p_inputs[i_index].index = i_index;
2288
2289             if( v4l2_ioctl( i_fd, VIDIOC_ENUMINPUT, &p_sys->p_inputs[i_index] ) )
2290             {
2291                 msg_Err( p_obj, "cannot get video input characteristics (%m)" );
2292                 goto open_failed;
2293             }
2294             msg_Dbg( p_obj, "video input %i (%s) has type: %s %c",
2295                                 i_index,
2296                                 p_sys->p_inputs[i_index].name,
2297                                 p_sys->p_inputs[i_index].type
2298                                         == V4L2_INPUT_TYPE_TUNER ?
2299                                         "Tuner adapter" :
2300                                         "External analog input",
2301                                 i_index == p_sys->i_selected_input ? '*' : ' ' );
2302         }
2303     }
2304
2305     /* Probe video standards */
2306     if( p_sys->dev_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE )
2307     {
2308         struct v4l2_standard t_standards;
2309         t_standards.index = 0;
2310         while( v4l2_ioctl( i_fd, VIDIOC_ENUMSTD, &t_standards ) >=0 )
2311         {
2312             p_sys->i_standard++;
2313             t_standards.index = p_sys->i_standard;
2314         }
2315
2316         p_sys->p_standards = calloc( 1, p_sys->i_standard * sizeof( struct v4l2_standard ) );
2317         if( !p_sys->p_standards ) goto open_failed;
2318
2319         for( i_standard = 0; i_standard < p_sys->i_standard; i_standard++ )
2320         {
2321             p_sys->p_standards[i_standard].index = i_standard;
2322
2323             if( v4l2_ioctl( i_fd, VIDIOC_ENUMSTD, &p_sys->p_standards[i_standard] ) )
2324             {
2325                 msg_Err( p_obj, "cannot get video input standards (%m)" );
2326                 goto open_failed;
2327             }
2328             msg_Dbg( p_obj, "video standard %i is: %s %c",
2329                                 i_standard,
2330                                 p_sys->p_standards[i_standard].name,
2331                                 (unsigned)i_standard == p_sys->i_selected_standard_id ? '*' : ' ' );
2332         }
2333     }
2334
2335     /* initialize the structures for the ioctls */
2336     for( i_index = 0; i_index < 32; i_index++ )
2337     {
2338         p_sys->p_audios[i_index].index = i_index;
2339     }
2340
2341     /* Probe audio inputs */
2342     if( p_sys->dev_cap.capabilities & V4L2_CAP_AUDIO )
2343     {
2344         while( p_sys->i_audio < 32 &&
2345                v4l2_ioctl( i_fd, VIDIOC_S_AUDIO, &p_sys->p_audios[p_sys->i_audio] ) >= 0 )
2346         {
2347             if( v4l2_ioctl( i_fd, VIDIOC_G_AUDIO, &p_sys->p_audios[ p_sys->i_audio] ) < 0 )
2348             {
2349                 msg_Err( p_obj, "cannot get audio input characteristics (%m)" );
2350                 goto open_failed;
2351             }
2352
2353             msg_Dbg( p_obj, "audio input %i (%s) is %s %s %c",
2354                                 p_sys->i_audio,
2355                                 p_sys->p_audios[p_sys->i_audio].name,
2356                                 p_sys->p_audios[p_sys->i_audio].capability &
2357                                                     V4L2_AUDCAP_STEREO ?
2358                                         "Stereo" : "Mono",
2359                                 p_sys->p_audios[p_sys->i_audio].capability &
2360                                                     V4L2_AUDCAP_AVL ?
2361                                     "(Automatic Volume Level supported)" : "",
2362                                 p_sys->i_audio == p_sys->i_selected_audio_input ? '*' : ' ' );
2363
2364             p_sys->i_audio++;
2365         }
2366     }
2367
2368     /* List tuner caps */
2369     if( p_sys->dev_cap.capabilities & V4L2_CAP_TUNER )
2370     {
2371         struct v4l2_tuner tuner;
2372         memset( &tuner, 0, sizeof(tuner) );
2373         while( v4l2_ioctl( i_fd, VIDIOC_G_TUNER, &tuner ) >= 0 )
2374         {
2375             p_sys->i_tuner++;
2376             memset( &tuner, 0, sizeof(tuner) );
2377             tuner.index = p_sys->i_tuner;
2378         }
2379
2380         p_sys->p_tuners = calloc( 1, p_sys->i_tuner * sizeof( struct v4l2_tuner ) );
2381         if( !p_sys->p_tuners ) goto open_failed;
2382
2383         for( i_index = 0; i_index < p_sys->i_tuner; i_index++ )
2384         {
2385             p_sys->p_tuners[i_index].index = i_index;
2386
2387             if( v4l2_ioctl( i_fd, VIDIOC_G_TUNER, &p_sys->p_tuners[i_index] ) )
2388             {
2389                 msg_Err( p_obj, "cannot get tuner characteristics (%m)" );
2390                 goto open_failed;
2391             }
2392             msg_Dbg( p_obj, "tuner %i (%s) has type: %s, "
2393                               "frequency range: %.1f %s -> %.1f %s",
2394                                 i_index,
2395                                 p_sys->p_tuners[i_index].name,
2396                                 p_sys->p_tuners[i_index].type
2397                                         == V4L2_TUNER_RADIO ?
2398                                         "Radio" : "Analog TV",
2399                                 p_sys->p_tuners[i_index].rangelow * 62.5,
2400                                 p_sys->p_tuners[i_index].capability &
2401                                         V4L2_TUNER_CAP_LOW ?
2402                                         "Hz" : "kHz",
2403                                 p_sys->p_tuners[i_index].rangehigh * 62.5,
2404                                 p_sys->p_tuners[i_index].capability &
2405                                         V4L2_TUNER_CAP_LOW ?
2406                                         "Hz" : "kHz" );
2407
2408             struct v4l2_frequency frequency;
2409             memset( &frequency, 0, sizeof( frequency ) );
2410             if( v4l2_ioctl( i_fd, VIDIOC_G_FREQUENCY, &frequency ) < 0 )
2411             {
2412                 msg_Err( p_obj, "cannot get tuner frequency (%m)" );
2413                 goto open_failed;
2414             }
2415             msg_Dbg( p_obj, "tuner %i (%s) frequency: %.1f %s",
2416                      i_index,
2417                      p_sys->p_tuners[i_index].name,
2418                      frequency.frequency * 62.5,
2419                      p_sys->p_tuners[i_index].capability &
2420                              V4L2_TUNER_CAP_LOW ?
2421                              "Hz" : "kHz" );
2422         }
2423     }
2424
2425     /* Probe for available chromas */
2426     if( p_sys->dev_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE )
2427     {
2428         struct v4l2_fmtdesc codec;
2429
2430         i_index = 0;
2431         memset( &codec, 0, sizeof(codec) );
2432         codec.index = i_index;
2433         codec.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2434
2435         while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FMT, &codec ) >= 0 )
2436         {
2437             i_index++;
2438             codec.index = i_index;
2439         }
2440
2441         p_sys->i_codec = i_index;
2442
2443         p_sys->p_codecs = calloc( 1, p_sys->i_codec * sizeof( struct v4l2_fmtdesc ) );
2444
2445         for( i_index = 0; i_index < p_sys->i_codec; i_index++ )
2446         {
2447             p_sys->p_codecs[i_index].index = i_index;
2448             p_sys->p_codecs[i_index].type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2449
2450             if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FMT, &p_sys->p_codecs[i_index] ) < 0 )
2451             {
2452                 msg_Err( p_obj, "cannot get codec description (%m)" );
2453                 goto open_failed;
2454             }
2455
2456             /* only print if vlc supports the format */
2457             char psz_fourcc_v4l2[5];
2458             memset( &psz_fourcc_v4l2, 0, sizeof( psz_fourcc_v4l2 ) );
2459             vlc_fourcc_to_char( p_sys->p_codecs[i_index].pixelformat,
2460                                 &psz_fourcc_v4l2 );
2461             bool b_codec_supported = false;
2462             for( int i = 0; v4l2chroma_to_fourcc[i].i_v4l2 != 0; i++ )
2463             {
2464                 if( v4l2chroma_to_fourcc[i].i_v4l2 == p_sys->p_codecs[i_index].pixelformat )
2465                 {
2466                     b_codec_supported = true;
2467
2468                     char psz_fourcc[5];
2469                     memset( &psz_fourcc, 0, sizeof( psz_fourcc ) );
2470                     vlc_fourcc_to_char( v4l2chroma_to_fourcc[i].i_fourcc,
2471                                         &psz_fourcc );
2472                     msg_Dbg( p_obj, "device supports chroma %4s [%s, %s]",
2473                                 psz_fourcc,
2474                                 p_sys->p_codecs[i_index].description,
2475                                 psz_fourcc_v4l2 );
2476
2477 #ifdef VIDIOC_ENUM_FRAMESIZES
2478                     /* This is new in Linux 2.6.19 */
2479                     /* List valid frame sizes for this format */
2480                     struct v4l2_frmsizeenum frmsize;
2481                     memset( &frmsize, 0, sizeof(frmsize) );
2482                     frmsize.pixel_format = p_sys->p_codecs[i_index].pixelformat;
2483                     if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES, &frmsize ) < 0 )
2484                     {
2485                         /* Not all devices support this ioctl */
2486                         msg_Warn( p_obj, "Unable to query for frame sizes" );
2487                     }
2488                     else
2489                     {
2490                         switch( frmsize.type )
2491                         {
2492                             case V4L2_FRMSIZE_TYPE_DISCRETE:
2493                                 do
2494                                 {
2495                                     msg_Dbg( p_obj,
2496                 "    device supports size %dx%d",
2497                 frmsize.discrete.width, frmsize.discrete.height );
2498                                     frmsize.index++;
2499                                 } while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES, &frmsize ) >= 0 );
2500                                 break;
2501                             case V4L2_FRMSIZE_TYPE_STEPWISE:
2502                                 msg_Dbg( p_obj,
2503                 "    device supports sizes %dx%d to %dx%d using %dx%d increments",
2504                 frmsize.stepwise.min_width, frmsize.stepwise.min_height,
2505                 frmsize.stepwise.max_width, frmsize.stepwise.max_height,
2506                 frmsize.stepwise.step_width, frmsize.stepwise.step_height );
2507                                 break;
2508                             case V4L2_FRMSIZE_TYPE_CONTINUOUS:
2509                                 msg_Dbg( p_obj,
2510                 "    device supports all sizes %dx%d to %dx%d",
2511                 frmsize.stepwise.min_width, frmsize.stepwise.min_height,
2512                 frmsize.stepwise.max_width, frmsize.stepwise.max_height );
2513                                 break;
2514                         }
2515                     }
2516 #endif
2517                 }
2518             }
2519             if( !b_codec_supported )
2520             {
2521                     msg_Dbg( p_obj,
2522                          "device codec %4s (%s) not supported",
2523                          psz_fourcc_v4l2,
2524                          p_sys->p_codecs[i_index].description );
2525             }
2526         }
2527     }
2528
2529
2530     if( i_fd >= 0 ) v4l2_close( i_fd );
2531     return true;
2532
2533 open_failed:
2534
2535     if( i_fd >= 0 ) v4l2_close( i_fd );
2536     return false;
2537
2538 }
2539
2540 static void name2var( unsigned char *name )
2541 {
2542     for( ; *name; name++ )
2543         *name = (*name == ' ') ? '_' : tolower( *name );
2544 }
2545
2546 /*****************************************************************************
2547  * Print a user-class v4l2 control's details, create the relevant variable,
2548  * change the value if needed.
2549  *****************************************************************************/
2550 static void ControlListPrint( vlc_object_t *p_obj, demux_sys_t *p_sys, int i_fd,
2551                               struct v4l2_queryctrl queryctrl,
2552                               bool b_reset, bool b_demux )
2553 {
2554     struct v4l2_querymenu querymenu;
2555     unsigned int i_mid;
2556
2557     int i;
2558     int i_val;
2559
2560     char *psz_name;
2561     vlc_value_t val, val2;
2562
2563     if( queryctrl.flags & V4L2_CTRL_FLAG_GRABBED )
2564         msg_Dbg( p_obj, "    control is busy" );
2565     if( queryctrl.flags & V4L2_CTRL_FLAG_READ_ONLY )
2566         msg_Dbg( p_obj, "    control is read-only" );
2567
2568     for( i = 0; controls[i].psz_name != NULL; i++ )
2569         if( controls[i].i_cid == queryctrl.id ) break;
2570
2571     if( controls[i].psz_name )
2572     {
2573         psz_name = strdup( controls[i].psz_name );
2574         char psz_cfg_name[40];
2575         sprintf( psz_cfg_name, CFG_PREFIX "%s", psz_name );
2576         i_val = var_CreateGetInteger( p_obj, psz_cfg_name );
2577         var_Destroy( p_obj, psz_cfg_name );
2578     }
2579     else
2580     {
2581         psz_name = strdup( (const char *)queryctrl.name );
2582         name2var( (unsigned char *)psz_name );
2583         i_val = -1;
2584     }
2585
2586     switch( queryctrl.type )
2587     {
2588         case V4L2_CTRL_TYPE_INTEGER:
2589             msg_Dbg( p_obj, "    integer control" );
2590             msg_Dbg( p_obj,
2591                      "    valid values: %d to %d by steps of %d",
2592                      queryctrl.minimum, queryctrl.maximum,
2593                      queryctrl.step );
2594
2595             var_Create( p_obj, psz_name,
2596                         VLC_VAR_INTEGER | VLC_VAR_HASMIN | VLC_VAR_HASMAX
2597                       | VLC_VAR_HASSTEP | VLC_VAR_ISCOMMAND );
2598             val.i_int = queryctrl.minimum;
2599             var_Change( p_obj, psz_name, VLC_VAR_SETMIN, &val, NULL );
2600             val.i_int = queryctrl.maximum;
2601             var_Change( p_obj, psz_name, VLC_VAR_SETMAX, &val, NULL );
2602             val.i_int = queryctrl.step;
2603             var_Change( p_obj, psz_name, VLC_VAR_SETSTEP, &val, NULL );
2604             break;
2605         case V4L2_CTRL_TYPE_BOOLEAN:
2606             msg_Dbg( p_obj, "    boolean control" );
2607             var_Create( p_obj, psz_name,
2608                         VLC_VAR_BOOL | VLC_VAR_ISCOMMAND );
2609             break;
2610         case V4L2_CTRL_TYPE_MENU:
2611             msg_Dbg( p_obj, "    menu control" );
2612             var_Create( p_obj, psz_name,
2613                         VLC_VAR_INTEGER | VLC_VAR_HASCHOICE
2614                       | VLC_VAR_ISCOMMAND );
2615             memset( &querymenu, 0, sizeof( querymenu ) );
2616             for( i_mid = queryctrl.minimum;
2617                  i_mid <= (unsigned)queryctrl.maximum;
2618                  i_mid++ )
2619             {
2620                 querymenu.index = i_mid;
2621                 querymenu.id = queryctrl.id;
2622                 if( v4l2_ioctl( i_fd, VIDIOC_QUERYMENU, &querymenu ) >= 0 )
2623                 {
2624                     msg_Dbg( p_obj, "        %d: %s",
2625                              querymenu.index, querymenu.name );
2626                     val.i_int = querymenu.index;
2627                     val2.psz_string = (char *)querymenu.name;
2628                     var_Change( p_obj, psz_name,
2629                                 VLC_VAR_ADDCHOICE, &val, &val2 );
2630                 }
2631             }
2632             break;
2633         case V4L2_CTRL_TYPE_BUTTON:
2634             msg_Dbg( p_obj, "    button control" );
2635             var_Create( p_obj, psz_name,
2636                         VLC_VAR_VOID | VLC_VAR_ISCOMMAND );
2637             break;
2638         case V4L2_CTRL_TYPE_CTRL_CLASS:
2639             msg_Dbg( p_obj, "    control class" );
2640             var_Create( p_obj, psz_name, VLC_VAR_VOID );
2641             break;
2642         default:
2643             msg_Dbg( p_obj, "    unknown control type (FIXME)" );
2644             /* FIXME */
2645             break;
2646     }
2647
2648     switch( queryctrl.type )
2649     {
2650         case V4L2_CTRL_TYPE_INTEGER:
2651         case V4L2_CTRL_TYPE_BOOLEAN:
2652         case V4L2_CTRL_TYPE_MENU:
2653             {
2654                 struct v4l2_control control;
2655                 msg_Dbg( p_obj, "    default value: %d",
2656                          queryctrl.default_value );
2657                 memset( &control, 0, sizeof( control ) );
2658                 control.id = queryctrl.id;
2659                 if( v4l2_ioctl( i_fd, VIDIOC_G_CTRL, &control ) >= 0 )
2660                 {
2661                     msg_Dbg( p_obj, "    current value: %d", control.value );
2662                 }
2663                 if( i_val == -1 )
2664                 {
2665                     i_val = control.value;
2666                     if( b_reset && queryctrl.default_value != control.value )
2667                     {
2668                         msg_Dbg( p_obj, "    reset value to default" );
2669                         Control( p_obj, p_sys, i_fd, psz_name,
2670                                  queryctrl.id, queryctrl.default_value );
2671                     }
2672                 }
2673                 else
2674                 {
2675                     Control( p_obj, p_sys, i_fd, psz_name,
2676                              queryctrl.id, i_val );
2677                 }
2678             }
2679             break;
2680         default:
2681             break;
2682     }
2683
2684     val.psz_string = (char *)queryctrl.name;
2685     var_Change( p_obj, psz_name, VLC_VAR_SETTEXT, &val, NULL );
2686     val.i_int = queryctrl.id;
2687     val2.psz_string = (char *)psz_name;
2688     var_Change( p_obj, "allcontrols", VLC_VAR_ADDCHOICE, &val, &val2 );
2689     /* bad things happen changing MPEG mid-stream
2690      * so don't add to Ext Settings GUI */
2691     if( V4L2_CTRL_ID2CLASS( queryctrl.id ) != V4L2_CTRL_CLASS_MPEG )
2692         var_Change( p_obj, "controls", VLC_VAR_ADDCHOICE, &val, &val2 );
2693
2694     switch( var_Type( p_obj, psz_name ) & VLC_VAR_TYPE )
2695     {
2696         case VLC_VAR_BOOL:
2697             var_SetBool( p_obj, psz_name, i_val );
2698             break;
2699         case VLC_VAR_INTEGER:
2700             var_SetInteger( p_obj, psz_name, i_val );
2701             break;
2702         case VLC_VAR_VOID:
2703             break;
2704         default:
2705             msg_Warn( p_obj, "FIXME: %s %s %d", __FILE__, __func__,
2706                       __LINE__ );
2707             break;
2708     }
2709
2710     if( b_demux )
2711         var_AddCallback( p_obj, psz_name,
2712                         DemuxControlCallback, (void*)(intptr_t)queryctrl.id );
2713     else
2714         var_AddCallback( p_obj, psz_name,
2715                         AccessControlCallback, (void*)(intptr_t)queryctrl.id );
2716
2717     free( psz_name );
2718 }
2719
2720 /*****************************************************************************
2721  * List all user-class v4l2 controls, set them to the user specified
2722  * value and create the relevant variables to enable runtime changes
2723  *****************************************************************************/
2724 static int ControlList( vlc_object_t *p_obj, demux_sys_t *p_sys, int i_fd,
2725                         bool b_reset, bool b_demux )
2726 {
2727     struct v4l2_queryctrl queryctrl;
2728     int i_cid;
2729
2730     memset( &queryctrl, 0, sizeof( queryctrl ) );
2731
2732     /* A list of available controls (aka the variable name) will be
2733      * stored as choices in the "allcontrols" variable. We'll thus be able
2734      * to use those to create an appropriate interface
2735      * A list of available controls that can be changed mid-stream will
2736      * be stored in the "controls" variable */
2737     var_Create( p_obj, "controls", VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
2738     var_Create( p_obj, "allcontrols", VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
2739
2740     var_Create( p_obj, "controls-update", VLC_VAR_VOID | VLC_VAR_ISCOMMAND );
2741
2742     /* Add a control to reset all controls to their default values */
2743     vlc_value_t val, val2;
2744     var_Create( p_obj, "controls-reset", VLC_VAR_VOID | VLC_VAR_ISCOMMAND );
2745     val.psz_string = _( "Reset controls to default" );
2746     var_Change( p_obj, "controls-reset", VLC_VAR_SETTEXT, &val, NULL );
2747     val.i_int = -1;
2748     val2.psz_string = (char *)"controls-reset";
2749     var_Change( p_obj, "controls", VLC_VAR_ADDCHOICE, &val, &val2 );
2750     if (b_demux)
2751         var_AddCallback( p_obj, "controls-reset", DemuxControlResetCallback, NULL );
2752     else
2753         var_AddCallback( p_obj, "controls-reset", AccessControlResetCallback, NULL );
2754
2755     queryctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
2756     if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2757     {
2758         msg_Dbg( p_obj, "Extended control API supported by v4l2 driver" );
2759
2760         /* List extended controls */
2761         queryctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
2762         while( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2763         {
2764             if( queryctrl.type == V4L2_CTRL_TYPE_CTRL_CLASS )
2765             {
2766                 msg_Dbg( p_obj, "%s", queryctrl.name );
2767                 queryctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
2768                 continue;
2769             }
2770             switch( V4L2_CTRL_ID2CLASS( queryctrl.id ) )
2771             {
2772                 case V4L2_CTRL_CLASS_USER:
2773                     msg_Dbg( p_obj, "Available control: %s (%x)",
2774                              queryctrl.name, queryctrl.id );
2775                     break;
2776                 case V4L2_CTRL_CLASS_MPEG:
2777                     name2var( queryctrl.name );
2778                     msg_Dbg( p_obj, "Available MPEG control: %s (%x)",
2779                              queryctrl.name, queryctrl.id );
2780                     break;
2781                 default:
2782                     msg_Dbg( p_obj, "Available private control: %s (%x)",
2783                              queryctrl.name, queryctrl.id );
2784                     break;
2785             }
2786             ControlListPrint( p_obj, p_sys, i_fd, queryctrl, b_reset, b_demux );
2787             queryctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
2788         }
2789     }
2790     else
2791     {
2792         msg_Dbg( p_obj, "Extended control API not supported by v4l2 driver" );
2793
2794         /* List public controls */
2795         for( i_cid = V4L2_CID_BASE;
2796              i_cid < V4L2_CID_LASTP1;
2797              i_cid ++ )
2798         {
2799             queryctrl.id = i_cid;
2800             if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2801             {
2802                 if( queryctrl.flags & V4L2_CTRL_FLAG_DISABLED )
2803                     continue;
2804                 msg_Dbg( p_obj, "Available control: %s (%x)",
2805                          queryctrl.name, queryctrl.id );
2806                 ControlListPrint( p_obj, p_sys, i_fd, queryctrl,
2807                                   b_reset, b_demux );
2808             }
2809         }
2810
2811         /* List private controls */
2812         for( i_cid = V4L2_CID_PRIVATE_BASE;
2813              ;
2814              i_cid ++ )
2815         {
2816             queryctrl.id = i_cid;
2817             if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2818             {
2819                 if( queryctrl.flags & V4L2_CTRL_FLAG_DISABLED )
2820                     continue;
2821                 msg_Dbg( p_obj, "Available private control: %s (%x)",
2822                          queryctrl.name, queryctrl.id );
2823                 ControlListPrint( p_obj, p_sys, i_fd, queryctrl,
2824                                   b_reset, b_demux );
2825             }
2826             else
2827                 break;
2828         }
2829     }
2830
2831     return VLC_SUCCESS;
2832 }
2833
2834 static void SetAvailControlsByString( vlc_object_t *p_obj, demux_sys_t *p_sys,
2835                                       int i_fd )
2836 {
2837     char *psz_parser = p_sys->psz_set_ctrls;
2838     vlc_value_t val, text, name;
2839
2840     if( psz_parser == NULL )
2841         return;
2842
2843     if( *psz_parser == '{' )
2844         psz_parser++;
2845
2846     int i_ret = var_Change( p_obj, "allcontrols", VLC_VAR_GETCHOICES,
2847                             &val, &text );
2848     if( i_ret < 0 )
2849     {
2850         msg_Err( p_obj, "Oops, can't find 'allcontrols' variable." );
2851         return;
2852     }
2853
2854     while( *psz_parser && *psz_parser != '}' )
2855     {
2856         char *psz_delim, *psz_assign;
2857
2858         while( *psz_parser == ',' || *psz_parser == ' ' )
2859             psz_parser++;
2860
2861         psz_delim = strchr( psz_parser, ',' );
2862         if( psz_delim == NULL )
2863             psz_delim = strchr( psz_parser, '}' );
2864         if( psz_delim == NULL )
2865             psz_delim = psz_parser + strlen( psz_parser );
2866
2867         psz_assign = memchr( psz_parser, '=', psz_delim - psz_parser );
2868         if( psz_assign == NULL )
2869         {
2870             char *psz_name = strndup( psz_parser, psz_delim - psz_parser );
2871             msg_Err( p_obj, "%s missing '='", psz_name );
2872             free( psz_name );
2873             psz_parser = psz_delim + 1;
2874             continue;
2875         }
2876
2877         for( int i = 0;
2878              i < val.p_list->i_count ;//&& psz_parser < psz_assign;
2879              i++ )
2880         {
2881             const char *psz_var = text.p_list->p_values[i].psz_string;
2882             int i_cid = val.p_list->p_values[i].i_int;
2883             var_Change( p_obj, psz_var, VLC_VAR_GETTEXT, &name, NULL );
2884             const char *psz_name = name.psz_string;
2885
2886             int i_availstrlen = strlen( psz_name );
2887             int i_parsestrlen = psz_assign - psz_parser;
2888             int i_maxstrlen = __MAX( i_availstrlen, i_parsestrlen);
2889
2890             if( !strncasecmp( psz_name, psz_parser, i_maxstrlen ) )
2891             {
2892                 Control( p_obj, p_sys, i_fd, psz_name, i_cid,
2893                          strtol( ++psz_assign, &psz_parser, 0) );
2894             }
2895             free( name.psz_string );
2896         }
2897
2898         if( psz_parser < psz_assign )
2899         {
2900             char *psz_name = strndup( psz_parser, psz_assign - psz_parser );
2901             msg_Err( p_obj, "Control %s not available", psz_name );
2902             free( psz_name );
2903             psz_parser = ( *psz_delim ) ? ( psz_delim + 1 ) : psz_delim;
2904         }
2905     }
2906     var_FreeList( &val, &text );
2907 }
2908
2909 /*****************************************************************************
2910  * Reset all user-class v4l2 controls to their default value
2911  *****************************************************************************/
2912 static int ControlReset( vlc_object_t *p_obj, demux_sys_t *p_sys, int i_fd )
2913 {
2914     struct v4l2_queryctrl queryctrl;
2915     int i_cid;
2916     memset( &queryctrl, 0, sizeof( queryctrl ) );
2917
2918     queryctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
2919     if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2920     {
2921         /* Extended control API supported */
2922         queryctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
2923         while( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2924         {
2925             if( queryctrl.type == V4L2_CTRL_TYPE_CTRL_CLASS
2926              || V4L2_CTRL_ID2CLASS( queryctrl.id ) == V4L2_CTRL_CLASS_MPEG )
2927             {
2928                 queryctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
2929                 continue;
2930             }
2931             struct v4l2_control control;
2932             memset( &control, 0, sizeof( control ) );
2933             control.id = queryctrl.id;
2934             if( v4l2_ioctl( i_fd, VIDIOC_G_CTRL, &control ) >= 0
2935              && queryctrl.default_value != control.value )
2936             {
2937                 int i;
2938                 for( i = 0; controls[i].psz_name != NULL; i++ )
2939                     if( controls[i].i_cid == queryctrl.id ) break;
2940                 name2var( queryctrl.name );
2941                 Control( p_obj, p_sys, i_fd,
2942                          controls[i].psz_name ? controls[i].psz_name
2943                           : (const char *)queryctrl.name,
2944                          queryctrl.id, queryctrl.default_value );
2945             }
2946             queryctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
2947         }
2948     }
2949     else
2950     {
2951
2952         /* public controls */
2953         for( i_cid = V4L2_CID_BASE;
2954              i_cid < V4L2_CID_LASTP1;
2955              i_cid ++ )
2956         {
2957             queryctrl.id = i_cid;
2958             if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2959             {
2960                 struct v4l2_control control;
2961                 if( queryctrl.flags & V4L2_CTRL_FLAG_DISABLED )
2962                     continue;
2963                 memset( &control, 0, sizeof( control ) );
2964                 control.id = queryctrl.id;
2965                 if( v4l2_ioctl( i_fd, VIDIOC_G_CTRL, &control ) >= 0
2966                  && queryctrl.default_value != control.value )
2967                 {
2968                     int i;
2969                     for( i = 0; controls[i].psz_name != NULL; i++ )
2970                         if( controls[i].i_cid == queryctrl.id ) break;
2971                     name2var( queryctrl.name );
2972                     Control( p_obj, p_sys, i_fd,
2973                              controls[i].psz_name ? controls[i].psz_name
2974                               : (const char *)queryctrl.name,
2975                              queryctrl.id, queryctrl.default_value );
2976                 }
2977             }
2978         }
2979
2980         /* private controls */
2981         for( i_cid = V4L2_CID_PRIVATE_BASE;
2982              ;
2983              i_cid ++ )
2984         {
2985             queryctrl.id = i_cid;
2986             if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2987             {
2988                 struct v4l2_control control;
2989                 if( queryctrl.flags & V4L2_CTRL_FLAG_DISABLED )
2990                     continue;
2991                 memset( &control, 0, sizeof( control ) );
2992                 control.id = queryctrl.id;
2993                 if( v4l2_ioctl( i_fd, VIDIOC_G_CTRL, &control ) >= 0
2994                  && queryctrl.default_value != control.value )
2995                 {
2996                     name2var( queryctrl.name );
2997                     Control( p_obj, p_sys, i_fd, (const char *)queryctrl.name,
2998                              queryctrl.id, queryctrl.default_value );
2999                 }
3000             }
3001             else
3002                 break;
3003         }
3004     }
3005     return VLC_SUCCESS;
3006 }
3007
3008 /*****************************************************************************
3009  * Issue user-class v4l2 controls
3010  *****************************************************************************/
3011 static int Control( vlc_object_t *p_obj, demux_sys_t *p_sys, int i_fd,
3012                     const char *psz_name, int i_cid, int i_value )
3013 {
3014     (void)p_sys;
3015     struct v4l2_queryctrl queryctrl;
3016     struct v4l2_control control;
3017     struct v4l2_ext_control ext_control;
3018     struct v4l2_ext_controls ext_controls;
3019
3020     if( i_value == -1 )
3021         return VLC_SUCCESS;
3022
3023     memset( &queryctrl, 0, sizeof( queryctrl ) );
3024
3025     queryctrl.id = i_cid;
3026
3027     if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) < 0
3028         || queryctrl.flags & V4L2_CTRL_FLAG_DISABLED )
3029     {
3030         msg_Dbg( p_obj, "%s (%x) control is not supported.", psz_name, i_cid );
3031         return VLC_EGENERIC;
3032     }
3033
3034     memset( &control, 0, sizeof( control ) );
3035     memset( &ext_control, 0, sizeof( ext_control ) );
3036     memset( &ext_controls, 0, sizeof( ext_controls ) );
3037     control.id = i_cid;
3038     ext_control.id = i_cid;
3039     ext_controls.ctrl_class = V4L2_CTRL_ID2CLASS( i_cid );
3040     ext_controls.count = 1;
3041     ext_controls.controls = &ext_control;
3042
3043     int i_ret = -1;
3044
3045     if( i_value >= queryctrl.minimum && i_value <= queryctrl.maximum )
3046     {
3047         ext_control.value = i_value;
3048         if( v4l2_ioctl( i_fd, VIDIOC_S_EXT_CTRLS, &ext_controls ) < 0 )
3049         {
3050             control.value = i_value;
3051             if( v4l2_ioctl( i_fd, VIDIOC_S_CTRL, &control ) < 0 )
3052             {
3053                 msg_Err( p_obj, "unable to set %s (%x) to %d (%m)",
3054                          psz_name, i_cid, i_value );
3055                 return VLC_EGENERIC;
3056             }
3057             i_ret = v4l2_ioctl( i_fd, VIDIOC_G_CTRL, &control );
3058         }
3059         else
3060         {
3061             i_ret = v4l2_ioctl( i_fd, VIDIOC_G_EXT_CTRLS, &ext_controls );
3062             control.value = ext_control.value;
3063         }
3064     }
3065
3066     if( i_ret >= 0 )
3067     {
3068         vlc_value_t val;
3069         msg_Dbg( p_obj, "video %s: %d", psz_name, control.value );
3070         switch( var_Type( p_obj, psz_name ) & VLC_VAR_TYPE )
3071         {
3072             case VLC_VAR_BOOL:
3073                 val.b_bool = control.value;
3074                 var_Change( p_obj, psz_name, VLC_VAR_SETVALUE, &val, NULL );
3075                 var_SetVoid( p_obj, "controls-update" );
3076                 break;
3077             case VLC_VAR_INTEGER:
3078                 val.i_int = control.value;
3079                 var_Change( p_obj, psz_name, VLC_VAR_SETVALUE, &val, NULL );
3080                 var_SetVoid( p_obj, "controls-update" );
3081                 break;
3082         }
3083     }
3084     return VLC_SUCCESS;
3085 }
3086
3087 /*****************************************************************************
3088  * On the fly change settings callback
3089  *****************************************************************************/
3090 static int DemuxControlCallback( vlc_object_t *p_this,
3091     const char *psz_var, vlc_value_t oldval, vlc_value_t newval,
3092     void *p_data )
3093 {
3094     (void)oldval;
3095     demux_t *p_demux = (demux_t*)p_this;
3096     demux_sys_t *p_sys = p_demux->p_sys;
3097     int i_cid = (long int)p_data;
3098
3099     int i_fd = p_sys->i_fd;
3100
3101     if( i_fd < 0 )
3102         return VLC_EGENERIC;
3103
3104     Control( p_this, p_sys, i_fd, psz_var, i_cid, newval.i_int );
3105
3106     return VLC_EGENERIC;
3107 }
3108
3109 static int DemuxControlResetCallback( vlc_object_t *p_this,
3110     const char *psz_var, vlc_value_t oldval, vlc_value_t newval, void *p_data )
3111 {
3112     (void)psz_var;    (void)oldval;    (void)newval;    (void)p_data;
3113     demux_t *p_demux = (demux_t*)p_this;
3114     demux_sys_t *p_sys = p_demux->p_sys;
3115
3116     int i_fd = p_sys->i_fd;
3117
3118     if( i_fd < 0 )
3119         return VLC_EGENERIC;
3120
3121     ControlReset( p_this, p_sys, i_fd );
3122
3123     return VLC_EGENERIC;
3124 }
3125
3126 static int AccessControlCallback( vlc_object_t *p_this,
3127     const char *psz_var, vlc_value_t oldval, vlc_value_t newval,
3128     void *p_data )
3129 {
3130     (void)oldval;
3131     access_t *p_access = (access_t *)p_this;
3132     demux_sys_t *p_sys = (demux_sys_t *) p_access->p_sys;
3133     int i_cid = (long int)p_data;
3134
3135     int i_fd = p_sys->i_fd;
3136
3137     if( i_fd < 0 )
3138         return VLC_EGENERIC;
3139
3140     Control( p_this, p_sys, i_fd, psz_var, i_cid, newval.i_int );
3141
3142     return VLC_EGENERIC;
3143 }
3144
3145 static int AccessControlResetCallback( vlc_object_t *p_this,
3146     const char *psz_var, vlc_value_t oldval, vlc_value_t newval, void *p_data )
3147 {
3148     (void)psz_var;     (void)oldval;     (void)newval;     (void)p_data;
3149     access_t *p_access = (access_t *)p_this;
3150     demux_sys_t *p_sys = (demux_sys_t *) p_access->p_sys;
3151
3152     int i_fd = p_sys->i_fd;
3153
3154     if( i_fd < 0 )
3155         return VLC_EGENERIC;
3156
3157     ControlReset( p_this, p_sys, i_fd );
3158
3159     return VLC_EGENERIC;
3160 }