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 #else
  58 #   define v4l2_close close
  59 #   define v4l2_dup dup
  60 #   define v4l2_ioctl ioctl
  61 #   define v4l2_read read
  62 #   define v4l2_mmap mmap
  63 #   define v4l2_munmap munmap
  64 #endif
  65
  66 /*****************************************************************************
  67  * Module descriptior
  68  *****************************************************************************/
  69
  70 static int  DemuxOpen ( vlc_object_t * );
  71 static void DemuxClose( vlc_object_t * );
  72 static int  AccessOpen ( vlc_object_t * );
  73 static void AccessClose( vlc_object_t * );
  74
  75 #define STANDARD_TEXT N_( "Standard" )
  76 #define STANDARD_LONGTEXT N_( \
  77     "Video standard (Default, SECAM, PAL, or NTSC)." )
  78 #define CHROMA_TEXT N_("Video input chroma format")
  79 #define CHROMA_LONGTEXT N_( \
  80     "Force the Video4Linux2 video device to use a specific chroma format " \
  81     "(eg. I420 or I422 for raw images, MJPG for M-JPEG compressed input) " \
  82     "(Complete list: GREY, I240, RV16, RV15, RV24, RV32, YUY2, YUYV, UYVY, " \
  83     "I41N, I422, I420, I411, I410, MJPG)")
  84 #define INPUT_TEXT N_( "Input" )
  85 #define INPUT_LONGTEXT N_( \
  86     "Input of the card to use (see debug)." )
  87 #define AUDIO_INPUT_TEXT N_( "Audio input" )
  88 #define AUDIO_INPUT_LONGTEXT N_( \
  89     "Audio input of the card to use (see debug)." )
  90 #define IOMETHOD_TEXT N_( "IO Method" )
  91 #define IOMETHOD_LONGTEXT N_( \
  92     "IO Method (READ, MMAP, USERPTR)." )
  93 #define WIDTH_TEXT N_( "Width" )
  94 #define WIDTH_LONGTEXT N_( \
  95     "Force width (-1 for autodetect, 0 for driver default)." )
  96 #define HEIGHT_TEXT N_( "Height" )
  97 #define HEIGHT_LONGTEXT N_( \
  98     "Force height (-1 for autodetect, 0 for driver default)." )
  99 #define FPS_TEXT N_( "Framerate" )
 100 #define FPS_LONGTEXT N_( "Framerate to capture, if applicable " \
 101     "(0 for autodetect)." )
 102
 103 #define CTRL_RESET_TEXT N_( "Reset v4l2 controls" )
 104 #define CTRL_RESET_LONGTEXT N_( \
 105     "Reset controls to defaults provided by the v4l2 driver." )
 106 #define BRIGHTNESS_TEXT N_( "Brightness" )
 107 #define BRIGHTNESS_LONGTEXT N_( \
 108     "Brightness of the video input (if supported by the v4l2 driver)." )
 109 #define CONTRAST_TEXT N_( "Contrast" )
 110 #define CONTRAST_LONGTEXT N_( \
 111     "Contrast of the video input (if supported by the v4l2 driver)." )
 112 #define SATURATION_TEXT N_( "Saturation" )
 113 #define SATURATION_LONGTEXT N_( \
 114     "Saturation of the video input (if supported by the v4l2 driver)." )
 115 #define HUE_TEXT N_( "Hue" )
 116 #define HUE_LONGTEXT N_( \
 117     "Hue of the video input (if supported by the v4l2 driver)." )
 118 #define BLACKLEVEL_TEXT N_( "Black level" )
 119 #define BLACKLEVEL_LONGTEXT N_( \
 120     "Black level of the video input (if supported by the v4l2 driver)." )
 121 #define AUTOWHITEBALANCE_TEXT N_( "Auto white balance" )
 122 #define AUTOWHITEBALANCE_LONGTEXT N_( \
 123     "Automatically set the white balance of the video input " \
 124     "(if supported by the v4l2 driver)." )
 125 #define DOWHITEBALANCE_TEXT N_( "Do white balance" )
 126 #define DOWHITEBALANCE_LONGTEXT N_( \
 127     "Trigger a white balancing action, useless if auto white balance is " \
 128     "activated (if supported by the v4l2 driver)." )
 129 #define REDBALANCE_TEXT N_( "Red balance" )
 130 #define REDBALANCE_LONGTEXT N_( \
 131     "Red balance of the video input (if supported by the v4l2 driver)." )
 132 #define BLUEBALANCE_TEXT N_( "Blue balance" )
 133 #define BLUEBALANCE_LONGTEXT N_( \
 134     "Blue balance of the video input (if supported by the v4l2 driver)." )
 135 #define GAMMA_TEXT N_( "Gamma" )
 136 #define GAMMA_LONGTEXT N_( \
 137     "Gamma of the video input (if supported by the v4l2 driver)." )
 138 #define EXPOSURE_TEXT N_( "Exposure" )
 139 #define EXPOSURE_LONGTEXT N_( \
 140     "Exposure of the video input (if supported by the v4L2 driver)." )
 141 #define AUTOGAIN_TEXT N_( "Auto gain" )
 142 #define AUTOGAIN_LONGTEXT N_( \
 143     "Automatically set the video input's gain (if supported by the " \
 144     "v4l2 driver)." )
 145 #define GAIN_TEXT N_( "Gain" )
 146 #define GAIN_LONGTEXT N_( \
 147     "Video input's gain (if supported by the v4l2 driver)." )
 148 #define HFLIP_TEXT N_( "Horizontal flip" )
 149 #define HFLIP_LONGTEXT N_( \
 150     "Flip the video horizontally (if supported by the v4l2 driver)." )
 151 #define VFLIP_TEXT N_( "Vertical flip" )
 152 #define VFLIP_LONGTEXT N_( \
 153     "Flip the video vertically (if supported by the v4l2 driver)." )
 154 #define HCENTER_TEXT N_( "Horizontal centering" )
 155 #define HCENTER_LONGTEXT N_( \
 156     "Set the camera's horizontal centering (if supported by the v4l2 driver)." )
 157 #define VCENTER_TEXT N_( "Vertical centering" )
 158 #define VCENTER_LONGTEXT N_( \
 159     "Set the camera's vertical centering (if supported by the v4l2 driver)." )
 160
 161 #define AUDIO_VOLUME_TEXT N_( "Volume" )
 162 #define AUDIO_VOLUME_LONGTEXT N_( \
 163     "Volume of the audio input (if supported by the v4l2 driver)." )
 164 #define AUDIO_BALANCE_TEXT N_( "Balance" )
 165 #define AUDIO_BALANCE_LONGTEXT N_( \
 166     "Balance of the audio input (if supported by the v4l2 driver)." )
 167 #define AUDIO_MUTE_TEXT N_( "Mute" )
 168 #define AUDIO_MUTE_LONGTEXT N_( \
 169     "Mute audio input (if supported by the v4l2 driver)." )
 170 #define AUDIO_BASS_TEXT N_( "Bass" )
 171 #define AUDIO_BASS_LONGTEXT N_( \
 172     "Bass level of the audio input (if supported by the v4l2 driver)." )
 173 #define AUDIO_TREBLE_TEXT N_( "Treble" )
 174 #define AUDIO_TREBLE_LONGTEXT N_( \
 175     "Treble level of the audio input (if supported by the v4l2 driver)." )
 176 #define AUDIO_LOUDNESS_TEXT N_( "Loudness" )
 177 #define AUDIO_LOUDNESS_LONGTEXT N_( \
 178     "Loudness of the audio input (if supported by the v4l2 driver)." )
 179
 180 #define CACHING_TEXT N_("Caching value in ms")
 181 #define CACHING_LONGTEXT N_( \
 182     "Caching value for V4L2 captures. This " \
 183     "value should be set in milliseconds." )
 184 #define S_CTRLS_TEXT N_("v4l2 driver controls")
 185 #define S_CTRLS_LONGTEXT N_( \
 186     "Set the v4l2 driver controls to the values specified using a comma " \
 187     "separated list optionally encapsulated by curly braces " \
 188     "(e.g.: {video_bitrate=6000000,audio_crc=0,stream_type=3} ). " \
 189     "To list available controls, increase verbosity (-vvv) " \
 190     "or use the v4l2-ctl application." )
 191
 192 #define TUNER_TEXT N_("Tuner id")
 193 #define TUNER_LONGTEXT N_( \
 194     "Tuner id (see debug output)." )
 195 #define FREQUENCY_TEXT N_("Frequency")
 196 #define FREQUENCY_LONGTEXT N_( \
 197     "Tuner frequency in Hz or kHz (see debug output)" )
 198 #define TUNER_AUDIO_MODE_TEXT N_("Audio mode")
 199 #define TUNER_AUDIO_MODE_LONGTEXT N_( \
 200     "Tuner audio mono/stereo and track selection." )
 201
 202 #define AUDIO_DEPRECATED_ERROR N_( \
 203     "Alsa or OSS audio capture in the v4l2 access is deprecated. " \
 204     "please use 'v4l2:/""/ :input-slave=alsa:/""/' or " \
 205     "'v4l2:/""/ :input-slave=oss:/""/' instead." )
 206
 207 typedef enum {
 208     IO_METHOD_READ,
 209     IO_METHOD_MMAP,
 210     IO_METHOD_USERPTR,
 211 } io_method;
 212
 213 static const int i_standards_list[] =
 214     { V4L2_STD_UNKNOWN, V4L2_STD_SECAM, V4L2_STD_PAL, V4L2_STD_NTSC };
 215 static const char *const psz_standards_list_text[] =
 216     { N_("Default"), N_("SECAM"), N_("PAL"),  N_("NTSC") };
 217
 218 static const int i_iomethod_list[] =
 219     { IO_METHOD_READ, IO_METHOD_MMAP, IO_METHOD_USERPTR };
 220 static const char *const psz_iomethod_list_text[] =
 221     { N_("READ"), N_("MMAP"),  N_("USERPTR") };
 222
 223 static const int i_tuner_audio_modes_list[] =
 224     { V4L2_TUNER_MODE_MONO, V4L2_TUNER_MODE_STEREO,
 225       V4L2_TUNER_MODE_LANG1, V4L2_TUNER_MODE_LANG2,
 226       V4L2_TUNER_MODE_SAP, V4L2_TUNER_MODE_LANG1_LANG2 };
 227 static const char *const psz_tuner_audio_modes_list_text[] =
 228     { N_( "Mono" ),
 229       N_( "Stereo" ),
 230       N_( "Primary language (Analog TV tuners only)" ),
 231       N_( "Secondary language (Analog TV tuners only)" ),
 232       N_( "Second audio program (Analog TV tuners only)" ),
 233       N_( "Primary language left, Secondary language right" ) };
 234
 235 #define V4L2_DEFAULT "/dev/video0"
 236 #define CFG_PREFIX "v4l2-"
 237
 238 vlc_module_begin ()
 239     set_shortname( N_("Video4Linux2") )
 240     set_description( N_("Video4Linux2 input") )
 241     set_category( CAT_INPUT )
 242     set_subcategory( SUBCAT_INPUT_ACCESS )
 243
 244     set_section( N_( "Video input" ), NULL )
 245     add_integer( CFG_PREFIX "standard", 0, NULL, STANDARD_TEXT,
 246                  STANDARD_LONGTEXT, false );
 247         change_integer_list( i_standards_list, psz_standards_list_text, NULL );
 248     add_string( CFG_PREFIX "chroma", NULL, NULL, CHROMA_TEXT, CHROMA_LONGTEXT,
 249                 true );
 250     add_integer( CFG_PREFIX "input", 0, NULL, INPUT_TEXT, INPUT_LONGTEXT,
 251                 true );
 252     add_integer( CFG_PREFIX "audio-input", 0, NULL, AUDIO_INPUT_TEXT,
 253                  AUDIO_INPUT_LONGTEXT, true );
 254     add_integer( CFG_PREFIX "io", IO_METHOD_MMAP, NULL, IOMETHOD_TEXT,
 255                  IOMETHOD_LONGTEXT, true );
 256         change_integer_list( i_iomethod_list, psz_iomethod_list_text, NULL );
 257     add_integer( CFG_PREFIX "width", -1, NULL, WIDTH_TEXT,
 258                 WIDTH_LONGTEXT, true );
 259     add_integer( CFG_PREFIX "height", -1, NULL, HEIGHT_TEXT,
 260                 HEIGHT_LONGTEXT, true );
 261     add_float( CFG_PREFIX "fps", 0, NULL, FPS_TEXT, FPS_LONGTEXT, true )
 262     add_integer( CFG_PREFIX "caching", DEFAULT_PTS_DELAY / 1000, NULL,
 263                 CACHING_TEXT, CACHING_LONGTEXT, true );
 264
 265     set_section( N_( "Tuner" ), NULL )
 266     add_integer( CFG_PREFIX "tuner", 0, NULL, TUNER_TEXT, TUNER_LONGTEXT,
 267                  true );
 268     add_integer( CFG_PREFIX "tuner-frequency", -1, NULL, FREQUENCY_TEXT,
 269                  FREQUENCY_LONGTEXT, true );
 270     add_integer( CFG_PREFIX "tuner-audio-mode", -1, NULL, TUNER_AUDIO_MODE_TEXT,
 271                  TUNER_AUDIO_MODE_LONGTEXT, true );
 272         change_integer_list( i_tuner_audio_modes_list,
 273                              psz_tuner_audio_modes_list_text, 0 );
 274
 275     set_section( N_( "Controls" ),
 276                  N_( "v4l2 driver controls, if supported by your v4l2 driver." ) );
 277     add_bool( CFG_PREFIX "controls-reset", false, NULL, CTRL_RESET_TEXT,
 278               CTRL_RESET_LONGTEXT, true );
 279     add_integer( CFG_PREFIX "brightness", -1, NULL, BRIGHTNESS_TEXT,
 280                  BRIGHTNESS_LONGTEXT, true );
 281     add_integer( CFG_PREFIX "contrast", -1, NULL, CONTRAST_TEXT,
 282                  CONTRAST_LONGTEXT, true );
 283     add_integer( CFG_PREFIX "saturation", -1, NULL, SATURATION_TEXT,
 284                  SATURATION_LONGTEXT, true );
 285     add_integer( CFG_PREFIX "hue", -1, NULL, HUE_TEXT,
 286                  HUE_LONGTEXT, true );
 287     add_integer( CFG_PREFIX "black-level", -1, NULL, BLACKLEVEL_TEXT,
 288                  BLACKLEVEL_LONGTEXT, true );
 289     add_integer( CFG_PREFIX "auto-white-balance", -1, NULL,
 290                  AUTOWHITEBALANCE_TEXT, AUTOWHITEBALANCE_LONGTEXT, true );
 291     add_integer( CFG_PREFIX "do-white-balance", -1, NULL, DOWHITEBALANCE_TEXT,
 292                  DOWHITEBALANCE_LONGTEXT, true );
 293     add_integer( CFG_PREFIX "red-balance", -1, NULL, REDBALANCE_TEXT,
 294                  REDBALANCE_LONGTEXT, true );
 295     add_integer( CFG_PREFIX "blue-balance", -1, NULL, BLUEBALANCE_TEXT,
 296                  BLUEBALANCE_LONGTEXT, true );
 297     add_integer( CFG_PREFIX "gamma", -1, NULL, GAMMA_TEXT,
 298                  GAMMA_LONGTEXT, true );
 299     add_integer( CFG_PREFIX "exposure", -1, NULL, EXPOSURE_TEXT,
 300                  EXPOSURE_LONGTEXT, true );
 301     add_integer( CFG_PREFIX "autogain", -1, NULL, AUTOGAIN_TEXT,
 302                  AUTOGAIN_LONGTEXT, true );
 303     add_integer( CFG_PREFIX "gain", -1, NULL, GAIN_TEXT,
 304                  GAIN_LONGTEXT, true );
 305     add_integer( CFG_PREFIX "hflip", -1, NULL, HFLIP_TEXT,
 306                  HFLIP_LONGTEXT, true );
 307     add_integer( CFG_PREFIX "vflip", -1, NULL, VFLIP_TEXT,
 308                  VFLIP_LONGTEXT, true );
 309     add_integer( CFG_PREFIX "hcenter", -1, NULL, HCENTER_TEXT,
 310                  HCENTER_LONGTEXT, true );
 311     add_integer( CFG_PREFIX "vcenter", -1, NULL, VCENTER_TEXT,
 312                  VCENTER_LONGTEXT, true );
 313     add_integer( CFG_PREFIX "audio-volume", -1, NULL, AUDIO_VOLUME_TEXT,
 314                 AUDIO_VOLUME_LONGTEXT, true );
 315     add_integer( CFG_PREFIX "audio-balance", -1, NULL, AUDIO_BALANCE_TEXT,
 316                 AUDIO_BALANCE_LONGTEXT, true );
 317     add_bool( CFG_PREFIX "audio-mute", false, NULL, AUDIO_MUTE_TEXT,
 318               AUDIO_MUTE_LONGTEXT, true );
 319     add_integer( CFG_PREFIX "audio-bass", -1, NULL, AUDIO_BASS_TEXT,
 320                 AUDIO_BASS_LONGTEXT, true );
 321     add_integer( CFG_PREFIX "audio-treble", -1, NULL, AUDIO_TREBLE_TEXT,
 322                 AUDIO_TREBLE_LONGTEXT, true );
 323     add_integer( CFG_PREFIX "audio-loudness", -1, NULL, AUDIO_LOUDNESS_TEXT,
 324                 AUDIO_LOUDNESS_LONGTEXT, true );
 325     add_string( CFG_PREFIX "set-ctrls", NULL, NULL, S_CTRLS_TEXT,
 326               S_CTRLS_LONGTEXT, true );
 327
 328     add_obsolete_string( CFG_PREFIX "dev" );
 329
 330     add_obsolete_string( CFG_PREFIX "adev" );
 331     add_obsolete_integer( CFG_PREFIX "audio-method" );
 332     add_obsolete_bool( CFG_PREFIX "stereo" );
 333     add_obsolete_integer( CFG_PREFIX "samplerate" );
 334
 335     add_shortcut( "v4l2" )
 336     set_capability( "access_demux", 10 )
 337     set_callbacks( DemuxOpen, DemuxClose )
 338
 339     add_submodule ()
 340     add_shortcut( "v4l2c" )
 341     set_description( N_("Video4Linux2 Compressed A/V") )
 342     set_capability( "access", 0 )
 343     /* use these when open as access_demux fails; VLC will use another demux */
 344     set_callbacks( AccessOpen, AccessClose )
 345
 346 vlc_module_end ()
 347
 348 /*****************************************************************************
 349  * Access: local prototypes
 350  *****************************************************************************/
 351
 352 static void CommonClose( vlc_object_t *, demux_sys_t * );
 353 static void ParseMRL( demux_sys_t *, char *, vlc_object_t * );
 354 static void GetV4L2Params( demux_sys_t *, vlc_object_t * );
 355 static void SetAvailControlsByString( vlc_object_t *, demux_sys_t *, int );
 356
 357 static int DemuxControl( demux_t *, int, va_list );
 358 static int AccessControl( access_t *, int, va_list );
 359
 360 static int Demux( demux_t * );
 361 static ssize_t AccessRead( access_t *, uint8_t *, size_t );
 362
 363 static block_t* GrabVideo( demux_t *p_demux );
 364 static block_t* ProcessVideoFrame( demux_t *p_demux, uint8_t *p_frame, size_t );
 365
 366 static bool IsPixelFormatSupported( demux_t *p_demux,
 367                                           unsigned int i_pixelformat );
 368
 369 static int OpenVideoDev( vlc_object_t *, demux_sys_t *, bool );
 370 static bool ProbeVideoDev( vlc_object_t *, demux_sys_t *,
 371                                  const char *psz_device );
 372
 373 static int ControlList( vlc_object_t *, int , bool, bool );
 374 static int Control( vlc_object_t *, int i_fd,
 375                     const char *psz_name, int i_cid, int i_value );
 376
 377 static int DemuxControlCallback( vlc_object_t *p_this, const char *psz_var,
 378                                  vlc_value_t oldval, vlc_value_t newval,
 379                                  void *p_data );
 380 static int DemuxControlResetCallback( 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 AccessControlCallback( 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 AccessControlResetCallback( vlc_object_t *p_this,
 387                                        const char *psz_var, vlc_value_t oldval,
 388                                        vlc_value_t newval, void *p_data );
 389
 390 static const struct
 391 {
 392     unsigned int i_v4l2;
 393     int i_fourcc;
 394     int i_rmask;
 395     int i_gmask;
 396     int i_bmask;
 397 } v4l2chroma_to_fourcc[] =
 398 {
 399     /* Raw data types */
 400     { V4L2_PIX_FMT_GREY,    VLC_FOURCC('G','R','E','Y'), 0, 0, 0 },
 401     { V4L2_PIX_FMT_HI240,   VLC_FOURCC('I','2','4','0'), 0, 0, 0 },
 402     { V4L2_PIX_FMT_RGB555,  VLC_FOURCC('R','V','1','5'), 0x001f,0x03e0,0x7c00 },
 403     { V4L2_PIX_FMT_RGB565,  VLC_FOURCC('R','V','1','6'), 0x001f,0x07e0,0xf800 },
 404     /* Won't work since we don't know how to handle such gmask values
 405      * correctly
 406     { V4L2_PIX_FMT_RGB555X, VLC_FOURCC('R','V','1','5'), 0x007c,0xe003,0x1f00 },
 407     { V4L2_PIX_FMT_RGB565X, VLC_FOURCC('R','V','1','6'), 0x00f8,0xe007,0x1f00 },
 408     */
 409     { V4L2_PIX_FMT_BGR24,   VLC_FOURCC('R','V','2','4'), 0xff0000,0xff00,0xff },
 410     { V4L2_PIX_FMT_RGB24,   VLC_FOURCC('R','V','2','4'), 0xff,0xff00,0xff0000 },
 411     { V4L2_PIX_FMT_BGR32,   VLC_FOURCC('R','V','3','2'), 0xff0000,0xff00,0xff },
 412     { V4L2_PIX_FMT_RGB32,   VLC_FOURCC('R','V','3','2'), 0xff,0xff00,0xff0000 },
 413     { V4L2_PIX_FMT_YUYV,    VLC_FOURCC('Y','U','Y','2'), 0, 0, 0 },
 414     { V4L2_PIX_FMT_YUYV,    VLC_FOURCC('Y','U','Y','V'), 0, 0, 0 },
 415     { V4L2_PIX_FMT_UYVY,    VLC_FOURCC('U','Y','V','Y'), 0, 0, 0 },
 416     { V4L2_PIX_FMT_Y41P,    VLC_FOURCC('I','4','1','N'), 0, 0, 0 },
 417     { V4L2_PIX_FMT_YUV422P, VLC_FOURCC('I','4','2','2'), 0, 0, 0 },
 418     { V4L2_PIX_FMT_YVU420,  VLC_FOURCC('Y','V','1','2'), 0, 0, 0 },
 419     { V4L2_PIX_FMT_YUV411P, VLC_FOURCC('I','4','1','1'), 0, 0, 0 },
 420     { V4L2_PIX_FMT_YUV410,  VLC_FOURCC('I','4','1','0'), 0, 0, 0 },
 421
 422     /* Raw data types, not in V4L2 spec but still in videodev2.h and supported
 423      * by VLC */
 424     { V4L2_PIX_FMT_YUV420,  VLC_FOURCC('I','4','2','0'), 0, 0, 0 },
 425     /* FIXME { V4L2_PIX_FMT_RGB444,  VLC_FOURCC('R','V','3','2') }, */
 426
 427     /* Compressed data types */
 428     { V4L2_PIX_FMT_MJPEG,   VLC_FOURCC('M','J','P','G'), 0, 0, 0 },
 429 #if 0
 430     { V4L2_PIX_FMT_JPEG,    VLC_FOURCC('J','P','E','G') },
 431     { V4L2_PIX_FMT_DV,      VLC_FOURCC('?','?','?','?') },
 432     { V4L2_PIX_FMT_MPEG,    VLC_FOURCC('?','?','?','?') },
 433 #endif
 434     { 0, 0, 0, 0, 0 }
 435 };
 436
 437 /**
 438  * List of V4L2 chromas were confident enough to use as fallbacks if the
 439  * user hasn't provided a --v4l2-chroma value.
 440  *
 441  * Try YUV chromas first, then RGB little endian and MJPEG as last resort.
 442  */
 443 static const __u32 p_chroma_fallbacks[] =
 444 { V4L2_PIX_FMT_YUV420, V4L2_PIX_FMT_YVU420, V4L2_PIX_FMT_YUV422P,
 445   V4L2_PIX_FMT_YUYV, V4L2_PIX_FMT_UYVY, V4L2_PIX_FMT_BGR24,
 446   V4L2_PIX_FMT_BGR32, V4L2_PIX_FMT_MJPEG };
 447
 448 static const struct
 449 {
 450     const char *psz_name;
 451     unsigned int i_cid;
 452 } controls[] =
 453 {
 454     { "brightness", V4L2_CID_BRIGHTNESS },
 455     { "contrast", V4L2_CID_CONTRAST },
 456     { "saturation", V4L2_CID_SATURATION },
 457     { "hue", V4L2_CID_HUE },
 458     { "audio-volume", V4L2_CID_AUDIO_VOLUME },
 459     { "audio-balance", V4L2_CID_AUDIO_BALANCE },
 460     { "audio-bass", V4L2_CID_AUDIO_BASS },
 461     { "audio-treble", V4L2_CID_AUDIO_TREBLE },
 462     { "audio-mute", V4L2_CID_AUDIO_MUTE },
 463     { "audio-loudness", V4L2_CID_AUDIO_LOUDNESS },
 464     { "black-level", V4L2_CID_BLACK_LEVEL },
 465     { "auto-white-balance", V4L2_CID_AUTO_WHITE_BALANCE },
 466     { "do-white-balance", V4L2_CID_DO_WHITE_BALANCE },
 467     { "red-balance", V4L2_CID_RED_BALANCE },
 468     { "blue-balance", V4L2_CID_BLUE_BALANCE },
 469     { "gamma", V4L2_CID_GAMMA },
 470     { "exposure", V4L2_CID_EXPOSURE },
 471     { "autogain", V4L2_CID_AUTOGAIN },
 472     { "gain", V4L2_CID_GAIN },
 473     { "hflip", V4L2_CID_HFLIP },
 474     { "vflip", V4L2_CID_VFLIP },
 475     { "hcenter", V4L2_CID_HCENTER },
 476     { "vcenter", V4L2_CID_VCENTER },
 477     { NULL, 0 }
 478 };
 479
 480 struct buffer_t
 481 {
 482     void *  start;
 483     size_t  length;
 484 };
 485
 486 struct demux_sys_t
 487 {
 488     char *psz_device;  /* Main device from MRL */
 489     int  i_fd;
 490
 491     char *psz_requested_chroma;
 492
 493     /* Video */
 494     io_method io;
 495
 496     int i_cache;
 497
 498     struct v4l2_capability dev_cap;
 499
 500     int i_input;
 501     struct v4l2_input *p_inputs;
 502     int i_selected_input;
 503
 504     int i_standard;
 505     struct v4l2_standard *p_standards;
 506     v4l2_std_id i_selected_standard_id;
 507
 508     int i_audio;
 509     /* V4L2 devices cannot have more than 32 audio inputs */
 510     struct v4l2_audio p_audios[32];
 511     int i_selected_audio_input;
 512
 513     int i_tuner;
 514     struct v4l2_tuner *p_tuners;
 515
 516     int i_codec;
 517     struct v4l2_fmtdesc *p_codecs;
 518
 519     struct buffer_t *p_buffers;
 520     unsigned int i_nbuffers;
 521
 522     int i_width;
 523     int i_height;
 524     float f_fps;            /* <= 0.0 mean to grab at full rate */
 525     mtime_t i_video_pts;    /* only used when f_fps > 0 */
 526     int i_fourcc;
 527
 528     es_out_id_t *p_es;
 529
 530     /* Tuner */
 531     int i_cur_tuner;
 532     int i_frequency;
 533     int i_audio_mode;
 534
 535     /* Controls */
 536     char *psz_set_ctrls;
 537 };
 538
 539 static int FindMainDevice( vlc_object_t *p_this, demux_sys_t *p_sys,
 540                            bool b_demux )
 541 {
 542     /* TODO: if using default device, loop through all /dev/video* until
 543      * one works */
 544     msg_Dbg( p_this, "opening device '%s'", p_sys->psz_device );
 545     if( ProbeVideoDev( p_this, p_sys, p_sys->psz_device ) )
 546     {
 547         msg_Dbg( p_this, "'%s' is a video device", p_sys->psz_device );
 548         p_sys->i_fd = OpenVideoDev( p_this, p_sys, b_demux );
 549     }
 550
 551     if( p_sys->i_fd < 0 ) return VLC_EGENERIC;
 552     return VLC_SUCCESS;
 553 }
 554
 555 /*****************************************************************************
 556  * DemuxOpen: opens v4l2 device, access_demux callback
 557  *****************************************************************************
 558  *
 559  * url: <video device>::::
 560  *
 561  *****************************************************************************/
 562 static int DemuxOpen( vlc_object_t *p_this )
 563 {
 564     demux_t     *p_demux = (demux_t*)p_this;
 565     demux_sys_t *p_sys;
 566
 567     /* Only when selected */
 568     if( *p_demux->psz_access == '\0' ) return VLC_EGENERIC;
 569
 570     /* Set up p_demux */
 571     p_demux->pf_control = DemuxControl;
 572     p_demux->pf_demux = Demux;
 573     p_demux->info.i_update = 0;
 574     p_demux->info.i_title = 0;
 575     p_demux->info.i_seekpoint = 0;
 576
 577     p_demux->p_sys = p_sys = calloc( 1, sizeof( demux_sys_t ) );
 578     if( p_sys == NULL ) return VLC_ENOMEM;
 579
 580     GetV4L2Params(p_sys, (vlc_object_t *) p_demux);
 581
 582     ParseMRL( p_sys, p_demux->psz_path, (vlc_object_t *) p_demux );
 583
 584     if( FindMainDevice( p_this, p_sys, true ) != VLC_SUCCESS)
 585     {
 586         DemuxClose( p_this );
 587         return VLC_EGENERIC;
 588     }
 589
 590     return VLC_SUCCESS;
 591 }
 592
 593 /*****************************************************************************
 594  * GetV4L2Params: fill in p_sys parameters (shared by DemuxOpen and AccessOpen)
 595  *****************************************************************************/
 596 static void GetV4L2Params( demux_sys_t *p_sys, vlc_object_t *p_obj )
 597 {
 598     p_sys->i_video_pts = -1;
 599
 600     p_sys->i_selected_standard_id =
 601         i_standards_list[var_CreateGetInteger( p_obj, "v4l2-standard" )];
 602
 603     p_sys->i_selected_input = var_CreateGetInteger( p_obj, "v4l2-input" );
 604     p_sys->i_selected_audio_input =
 605         var_CreateGetInteger( p_obj, "v4l2-audio-input" );
 606
 607     p_sys->io = var_CreateGetInteger( p_obj, "v4l2-io" );
 608
 609     p_sys->i_width = var_CreateGetInteger( p_obj, "v4l2-width" );
 610     p_sys->i_height = var_CreateGetInteger( p_obj, "v4l2-height" );
 611
 612     var_Create( p_obj, "v4l2-controls-reset", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
 613
 614     p_sys->f_fps = var_CreateGetFloat( p_obj, "v4l2-fps" );
 615     p_sys->psz_requested_chroma = var_CreateGetString( p_obj, "v4l2-chroma" );
 616
 617     p_sys->i_cache = var_CreateGetInteger( p_obj, "v4l2-caching" );
 618
 619     p_sys->i_cur_tuner = var_CreateGetInteger( p_obj, "v4l2-tuner" );
 620     p_sys->i_frequency = var_CreateGetInteger( p_obj, "v4l2-tuner-frequency" );
 621     p_sys->i_audio_mode = var_CreateGetInteger( p_obj, "v4l2-tuner-audio-mode" );
 622
 623     p_sys->psz_set_ctrls = var_CreateGetString( p_obj, "v4l2-set-ctrls" );
 624
 625     p_sys->psz_device = NULL;
 626     p_sys->i_fd = -1;
 627
 628     p_sys->p_es = NULL;
 629 }
 630
 631 /*****************************************************************************
 632  * ParseMRL: parse the options contained in the MRL
 633  *****************************************************************************/
 634 static void ParseMRL( demux_sys_t *p_sys, char *psz_path, vlc_object_t *p_obj )
 635 {
 636     char *psz_dup = strdup( psz_path );
 637     char *psz_parser = psz_dup;
 638
 639     while( *psz_parser && *psz_parser != ':' )
 640     {
 641         psz_parser++;
 642     }
 643
 644     if( *psz_parser == ':' )
 645     {
 646         /* read options */
 647         for( ;; )
 648         {
 649             *psz_parser++ = '\0';
 650
 651             if( !strncmp( psz_parser, "standard=", strlen( "standard=" ) ) )
 652             {
 653                 psz_parser += strlen( "standard=" );
 654                 if( !strncmp( psz_parser, "pal", strlen( "pal" ) ) )
 655                 {
 656                     p_sys->i_selected_standard_id = V4L2_STD_PAL;
 657                     psz_parser += strlen( "pal" );
 658                 }
 659                 else if( !strncmp( psz_parser, "ntsc", strlen( "ntsc" ) ) )
 660                 {
 661                     p_sys->i_selected_standard_id = V4L2_STD_NTSC;
 662                     psz_parser += strlen( "ntsc" );
 663                 }
 664                 else if( !strncmp( psz_parser, "secam", strlen( "secam" ) ) )
 665                 {
 666                     p_sys->i_selected_standard_id = V4L2_STD_SECAM;
 667                     psz_parser += strlen( "secam" );
 668                 }
 669                 else if( !strncmp( psz_parser, "default", strlen( "default" ) ) )
 670                 {
 671                     p_sys->i_selected_standard_id = V4L2_STD_UNKNOWN;
 672                     psz_parser += strlen( "default" );
 673                 }
 674                 else
 675                 {
 676                     p_sys->i_selected_standard_id = i_standards_list[strtol( psz_parser, &psz_parser, 0 )];
 677                 }
 678             }
 679             else if( !strncmp( psz_parser, "chroma=", strlen( "chroma=" ) ) )
 680             {
 681                 int  i_len;
 682
 683                 psz_parser += strlen( "chroma=" );
 684                 if( strchr( psz_parser, ':' ) )
 685                 {
 686                     i_len = strchr( psz_parser, ':' ) - psz_parser;
 687                 }
 688                 else
 689                 {
 690                     i_len = strlen( psz_parser );
 691                 }
 692
 693                 free( p_sys->psz_requested_chroma );
 694                 p_sys->psz_requested_chroma = strndup( psz_parser, i_len );
 695
 696                 psz_parser += i_len;
 697             }
 698             else if( !strncmp( psz_parser, "input=", strlen( "input=" ) ) )
 699             {
 700                 p_sys->i_selected_input = strtol( psz_parser + strlen( "input=" ),
 701                                        &psz_parser, 0 );
 702             }
 703             else if( !strncmp( psz_parser, "audio-input=", strlen( "audio-input=" ) ) )
 704             {
 705                 p_sys->i_selected_audio_input = strtol( psz_parser + strlen( "audio-input=" ),
 706                                        &psz_parser, 0 );
 707             }
 708             else if( !strncmp( psz_parser, "fps=", strlen( "fps=" ) ) )
 709             {
 710                 p_sys->f_fps = strtof( psz_parser + strlen( "fps=" ),
 711                                        &psz_parser );
 712             }
 713             else if( !strncmp( psz_parser, "io=", strlen( "io=" ) ) )
 714             {
 715                 psz_parser += strlen( "io=" );
 716                 if( !strncmp( psz_parser, "read", strlen( "read" ) ) )
 717                 {
 718                     p_sys->io = IO_METHOD_READ;
 719                     psz_parser += strlen( "read" );
 720                 }
 721                 else if( !strncmp( psz_parser, "mmap", strlen( "mmap" ) ) )
 722                 {
 723                     p_sys->io = IO_METHOD_MMAP;
 724                     psz_parser += strlen( "mmap" );
 725                 }
 726                 else if( !strncmp( psz_parser, "userptr", strlen( "userptr" ) ) )
 727                 {
 728                     p_sys->io = IO_METHOD_USERPTR;
 729                     psz_parser += strlen( "userptr" );
 730                 }
 731                 else
 732                 {
 733                     p_sys->io = strtol( psz_parser, &psz_parser, 0 );
 734                 }
 735             }
 736             else if( !strncmp( psz_parser, "width=",
 737                                strlen( "width=" ) ) )
 738             {
 739                 p_sys->i_width =
 740                     strtol( psz_parser + strlen( "width=" ),
 741                             &psz_parser, 0 );
 742             }
 743             else if( !strncmp( psz_parser, "height=",
 744                                strlen( "height=" ) ) )
 745             {
 746                 p_sys->i_height =
 747                     strtol( psz_parser + strlen( "height=" ),
 748                             &psz_parser, 0 );
 749             }
 750             else if( !strncmp( psz_parser, "controls-reset",
 751                                strlen( "controls-reset" ) ) )
 752             {
 753                 var_SetBool( p_obj, "v4l2-controls-reset", true );
 754                 psz_parser += strlen( "controls-reset" );
 755             }
 756 #if 0
 757             else if( !strncmp( psz_parser, "brightness=",
 758                                strlen( "brightness=" ) ) )
 759             {
 760                 var_SetInteger( p_obj, "brightness",
 761                     strtol( psz_parser + strlen( "brightness=" ),
 762                             &psz_parser, 0 ) );
 763             }
 764             else if( !strncmp( psz_parser, "contrast=",
 765                                strlen( "contrast=" ) ) )
 766             {
 767                 var_SetInteger( p_obj, "contrast",
 768                     strtol( psz_parser + strlen( "contrast=" ),
 769                             &psz_parser, 0 ) );
 770             }
 771             else if( !strncmp( psz_parser, "saturation=",
 772                                strlen( "saturation=" ) ) )
 773             {
 774                 var_SetInteger( p_obj, "saturation",
 775                     strtol( psz_parser + strlen( "saturation=" ),
 776                             &psz_parser, 0 ) );
 777             }
 778             else if( !strncmp( psz_parser, "hue=",
 779                                strlen( "hue=" ) ) )
 780             {
 781                 var_SetInteger( p_obj, "hue",
 782                     strtol( psz_parser + strlen( "hue=" ),
 783                             &psz_parser, 0 ) );
 784             }
 785             else if( !strncmp( psz_parser, "gamma=",
 786                                strlen( "gamma=" ) ) )
 787             {
 788                 var_SetInteger( p_obj, "gamma",
 789                     strtol( psz_parser + strlen( "gamma=" ),
 790                             &psz_parser, 0 ) );
 791             }
 792 #endif
 793             else if( !strncmp( psz_parser, "caching=", strlen( "caching=" ) ) )
 794             {
 795                 p_sys->i_cache = strtol( psz_parser + strlen( "caching=" ),
 796                                          &psz_parser, 0 );
 797             }
 798             else if( !strncmp( psz_parser, "tuner=", strlen( "tuner=" ) ) )
 799             {
 800                 p_sys->i_cur_tuner = strtol( psz_parser + strlen( "tuner=" ),
 801                                          &psz_parser, 0 );
 802             }
 803             else if( !strncmp( psz_parser, "tuner-frequency=", strlen( "tuner-frequency=" ) ) )
 804             {
 805                 p_sys->i_frequency = strtol( psz_parser
 806                                           + strlen( "tuner-frequency=" ),
 807                                           &psz_parser, 0 );
 808             }
 809             else if( !strncmp( psz_parser, "tuner-audio-mode=", strlen( "tuner-audio-mode=" ) ) )
 810             {
 811                 p_sys->i_audio_mode = strtol( psz_parser
 812                                           + strlen( "tuner-audio-mode=" ),
 813                                           &psz_parser, 0 );
 814             }
 815             else if( !strncmp( psz_parser, "set-ctrls=", strlen( "set-ctrls=" )) )
 816             {
 817                 int  i_len;
 818
 819                 psz_parser += strlen( "set-ctrls=" );
 820                 if( strchr( psz_parser, ':' ) )
 821                 {
 822                     i_len = strchr( psz_parser, ':' ) - psz_parser;
 823                 }
 824                 else
 825                 {
 826                     i_len = strlen( psz_parser );
 827                 }
 828
 829                 p_sys->psz_set_ctrls = strndup( psz_parser, i_len );
 830
 831                 psz_parser += i_len;
 832             }
 833             else if( !strncmp( psz_parser, "adev=", strlen( "adev=" ) )
 834              || !strncmp( psz_parser, "samplerate=", strlen( "samplerate=" ) )
 835              || !strncmp( psz_parser, "audio-method", strlen( "audio-method" ) )
 836              || !strncmp( psz_parser, "stereo", strlen( "stereo" ) )
 837              || !strncmp( psz_parser, "mono", strlen( "mono" ) ) )
 838             {
 839                 if( strchr( psz_parser, ':' ) )
 840                 {
 841                     psz_parser = strchr( psz_parser, ':' );
 842                 }
 843                 else
 844                 {
 845                     psz_parser += strlen( psz_parser );
 846                 }
 847
 848                 msg_Err( p_obj, AUDIO_DEPRECATED_ERROR );
 849             }
 850             else
 851             {
 852                 char *psz_unk = strchr( psz_parser, ':' );
 853                 if (psz_unk)
 854                     psz_unk = strndup( psz_parser, psz_unk - psz_parser );
 855                 else
 856                     psz_unk = strdup( psz_parser);
 857                 msg_Warn( p_obj, "unknown option %s", psz_unk );
 858                 free (psz_unk);
 859             }
 860
 861             while( *psz_parser && *psz_parser != ':' )
 862             {
 863                 psz_parser++;
 864             }
 865
 866             if( *psz_parser == '\0' )
 867             {
 868                 break;
 869             }
 870         }
 871     }
 872
 873     /* Main device */
 874     if( *psz_dup )
 875         p_sys->psz_device = strdup( psz_dup );
 876     else
 877         p_sys->psz_device = strdup( V4L2_DEFAULT );
 878     free( psz_dup );
 879 }
 880
 881 /*****************************************************************************
 882  * Close: close device, free resources
 883  *****************************************************************************/
 884 static void AccessClose( vlc_object_t *p_this )
 885 {
 886     access_t    *p_access = (access_t *)p_this;
 887     demux_sys_t *p_sys   = (demux_sys_t *) p_access->p_sys;
 888
 889     CommonClose( p_this, p_sys );
 890 }
 891
 892 static void DemuxClose( vlc_object_t *p_this )
 893 {
 894     struct v4l2_buffer buf;
 895     enum v4l2_buf_type buf_type;
 896     unsigned int i;
 897
 898     demux_t     *p_demux = (demux_t *)p_this;
 899     demux_sys_t *p_sys   = p_demux->p_sys;
 900
 901     /* Stop video capture */
 902     if( p_sys->i_fd >= 0 )
 903     {
 904         switch( p_sys->io )
 905         {
 906         case IO_METHOD_READ:
 907             /* Nothing to do */
 908             break;
 909
 910         case IO_METHOD_MMAP:
 911         case IO_METHOD_USERPTR:
 912             /* Some drivers 'hang' internally if this is not done before streamoff */
 913             for( unsigned int i = 0; i < p_sys->i_nbuffers; i++ )
 914             {
 915                 memset( &buf, 0, sizeof(buf) );
 916                 buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 917                 buf.memory = ( p_sys->io == IO_METHOD_USERPTR ) ?
 918                     V4L2_MEMORY_USERPTR : V4L2_MEMORY_MMAP;
 919                 v4l2_ioctl( p_sys->i_fd, VIDIOC_DQBUF, &buf ); /* ignore result */
 920             }
 921
 922             buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 923             if( v4l2_ioctl( p_sys->i_fd, VIDIOC_STREAMOFF, &buf_type ) < 0 ) {
 924                 msg_Err( p_this, "VIDIOC_STREAMOFF failed" );
 925             }
 926
 927             break;
 928         }
 929     }
 930
 931     /* Free Video Buffers */
 932     if( p_sys->p_buffers ) {
 933         switch( p_sys->io )
 934         {
 935         case IO_METHOD_READ:
 936             free( p_sys->p_buffers[0].start );
 937             break;
 938
 939         case IO_METHOD_MMAP:
 940             for( i = 0; i < p_sys->i_nbuffers; ++i )
 941             {
 942                 if( v4l2_munmap( p_sys->p_buffers[i].start, p_sys->p_buffers[i].length ) )
 943                 {
 944                     msg_Err( p_this, "munmap failed" );
 945                 }
 946             }
 947             break;
 948
 949         case IO_METHOD_USERPTR:
 950             for( i = 0; i < p_sys->i_nbuffers; ++i )
 951             {
 952                free( p_sys->p_buffers[i].start );
 953             }
 954             break;
 955         }
 956         free( p_sys->p_buffers );
 957     }
 958
 959     CommonClose( p_this, p_sys );
 960 }
 961
 962 static void CommonClose( vlc_object_t *p_this, demux_sys_t *p_sys )
 963 {
 964     (void)p_this;
 965     /* Close */
 966     if( p_sys->i_fd >= 0 ) v4l2_close( p_sys->i_fd );
 967     free( p_sys->psz_device );
 968     free( p_sys->p_standards );
 969     free( p_sys->p_inputs );
 970     free( p_sys->p_tuners );
 971     free( p_sys->p_codecs );
 972     free( p_sys->psz_requested_chroma );
 973     free( p_sys->psz_set_ctrls );
 974
 975     free( p_sys );
 976 }
 977
 978 /*****************************************************************************
 979  * AccessOpen: opens v4l2 device, access callback
 980  *****************************************************************************
 981  *
 982  * url: <video device>::::
 983  *
 984  *****************************************************************************/
 985 static int AccessOpen( vlc_object_t * p_this )
 986 {
 987     access_t *p_access = (access_t*) p_this;
 988     demux_sys_t * p_sys;
 989
 990     /* Only when selected */
 991     if( *p_access->psz_access == '\0' ) return VLC_EGENERIC;
 992
 993     p_access->pf_read = AccessRead;
 994     p_access->pf_block = NULL;
 995     p_access->pf_seek = NULL;
 996     p_access->pf_control = AccessControl;
 997     p_access->info.i_update = 0;
 998     p_access->info.i_size = 0;
 999     p_access->info.i_pos = 0;
1000     p_access->info.b_eof = false;
1001     p_access->info.i_title = 0;
1002     p_access->info.i_seekpoint = 0;
1003
1004     p_sys = calloc( 1, sizeof( demux_sys_t ) );
1005     p_access->p_sys = (access_sys_t *) p_sys;
1006     if( p_sys == NULL ) return VLC_ENOMEM;
1007
1008     GetV4L2Params( p_sys, (vlc_object_t *) p_access );
1009
1010     ParseMRL( p_sys, p_access->psz_path, (vlc_object_t *) p_access );
1011
1012     if( FindMainDevice( p_this, p_sys, false ) != VLC_SUCCESS )
1013     {
1014         AccessClose( p_this );
1015         return VLC_EGENERIC;
1016     }
1017
1018     return VLC_SUCCESS;
1019 }
1020
1021 /*****************************************************************************
1022  * DemuxControl:
1023  *****************************************************************************/
1024 static int DemuxControl( demux_t *p_demux, int i_query, va_list args )
1025 {
1026     demux_sys_t *p_sys = p_demux->p_sys;
1027     bool *pb;
1028     int64_t    *pi64;
1029
1030     switch( i_query )
1031     {
1032         /* Special for access_demux */
1033         case DEMUX_CAN_PAUSE:
1034         case DEMUX_CAN_SEEK:
1035         case DEMUX_SET_PAUSE_STATE:
1036         case DEMUX_CAN_CONTROL_PACE:
1037             pb = (bool*)va_arg( args, bool * );
1038             *pb = false;
1039             return VLC_SUCCESS;
1040
1041         case DEMUX_GET_PTS_DELAY:
1042             pi64 = (int64_t*)va_arg( args, int64_t * );
1043             *pi64 = (int64_t)p_sys->i_cache * 1000;
1044             return VLC_SUCCESS;
1045
1046         case DEMUX_GET_TIME:
1047             pi64 = (int64_t*)va_arg( args, int64_t * );
1048             *pi64 = mdate();
1049             return VLC_SUCCESS;
1050
1051         /* TODO implement others */
1052         default:
1053             return VLC_EGENERIC;
1054     }
1055
1056     return VLC_EGENERIC;
1057 }
1058
1059 /*****************************************************************************
1060  * AccessControl: access callback
1061  *****************************************************************************/
1062 static int AccessControl( access_t *p_access, int i_query, va_list args )
1063 {
1064     bool   *pb_bool;
1065     int          *pi_int;
1066     int64_t      *pi_64;
1067     demux_sys_t  *p_sys = (demux_sys_t *) p_access->p_sys;
1068
1069     switch( i_query )
1070     {
1071         /* */
1072         case ACCESS_CAN_SEEK:
1073         case ACCESS_CAN_FASTSEEK:
1074             pb_bool = (bool*)va_arg( args, bool* );
1075             *pb_bool = false;
1076             break;
1077         case ACCESS_CAN_PAUSE:
1078             pb_bool = (bool*)va_arg( args, bool* );
1079             *pb_bool = false;
1080             break;
1081         case ACCESS_CAN_CONTROL_PACE:
1082             pb_bool = (bool*)va_arg( args, bool* );
1083             *pb_bool = false;
1084             break;
1085
1086         /* */
1087         case ACCESS_GET_MTU:
1088             pi_int = (int*)va_arg( args, int * );
1089             *pi_int = 0;
1090             break;
1091
1092         case ACCESS_GET_PTS_DELAY:
1093             pi_64 = (int64_t*)va_arg( args, int64_t * );
1094             *pi_64 = (int64_t) p_sys->i_cache * 1000;
1095             break;
1096
1097         /* */
1098         case ACCESS_SET_PAUSE_STATE:
1099             /* Nothing to do */
1100             break;
1101
1102         case ACCESS_GET_TITLE_INFO:
1103         case ACCESS_SET_TITLE:
1104         case ACCESS_SET_SEEKPOINT:
1105         case ACCESS_SET_PRIVATE_ID_STATE:
1106         case ACCESS_GET_CONTENT_TYPE:
1107         case ACCESS_GET_META:
1108             return VLC_EGENERIC;
1109
1110         default:
1111             msg_Warn( p_access, "Unimplemented query in control(%d).", i_query);
1112             return VLC_EGENERIC;
1113
1114     }
1115     return VLC_SUCCESS;
1116 }
1117
1118 /*****************************************************************************
1119  * AccessRead: access callback
1120  ******************************************************************************/
1121 static ssize_t AccessRead( access_t * p_access, uint8_t * p_buffer, size_t i_len )
1122 {
1123     demux_sys_t *p_sys = (demux_sys_t *) p_access->p_sys;
1124     struct pollfd ufd;
1125     int i_ret;
1126
1127     ufd.fd = p_sys->i_fd;
1128     ufd.events = POLLIN;
1129
1130     if( p_access->info.b_eof )
1131         return 0;
1132
1133     do
1134     {
1135         if( !vlc_object_alive (p_access) )
1136             return 0;
1137
1138         ufd.revents = 0;
1139     }
1140     while( ( i_ret = poll( &ufd, 1, 500 ) ) == 0 );
1141
1142     if( i_ret < 0 )
1143     {
1144         msg_Err( p_access, "Polling error (%m)." );
1145         return -1;
1146     }
1147
1148     i_ret = v4l2_read( p_sys->i_fd, p_buffer, i_len );
1149     if( i_ret == 0 )
1150     {
1151         p_access->info.b_eof = true;
1152     }
1153     else if( i_ret > 0 )
1154     {
1155         p_access->info.i_pos += i_ret;
1156     }
1157
1158     return i_ret;
1159 }
1160
1161 /*****************************************************************************
1162  * Demux: Processes the audio or video frame
1163  *****************************************************************************/
1164 static int Demux( demux_t *p_demux )
1165 {
1166     demux_sys_t *p_sys = p_demux->p_sys;
1167
1168     struct pollfd fd;
1169     fd.fd = p_sys->i_fd;
1170     fd.events = POLLIN|POLLPRI;
1171     fd.revents = 0;
1172
1173     /* Wait for data */
1174     if( poll( &fd, 1, 500 ) ) /* Timeout after 0.5 seconds since I don't know if pf_demux can be blocking. */
1175     {
1176         if( fd.revents & (POLLIN|POLLPRI) )
1177         {
1178             block_t *p_block = GrabVideo( p_demux );
1179             if( p_block )
1180             {
1181                 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
1182                 es_out_Send( p_demux->out, p_sys->p_es, p_block );
1183             }
1184         }
1185     }
1186
1187     return 1;
1188 }
1189
1190 /*****************************************************************************
1191  * GrabVideo: Grab a video frame
1192  *****************************************************************************/
1193 static block_t* GrabVideo( demux_t *p_demux )
1194 {
1195     demux_sys_t *p_sys = p_demux->p_sys;
1196
1197     block_t *p_block = NULL;
1198     struct v4l2_buffer buf;
1199     ssize_t i_ret;
1200
1201     if( p_sys->f_fps >= 0.1 && p_sys->i_video_pts > 0 )
1202     {
1203         mtime_t i_dur = (mtime_t)((double)1000000 / (double)p_sys->f_fps);
1204
1205         /* Did we wait long enough ? (frame rate reduction) */
1206         if( p_sys->i_video_pts + i_dur > mdate() ) return 0;
1207     }
1208
1209     /* Grab Video Frame */
1210     switch( p_sys->io )
1211     {
1212     case IO_METHOD_READ:
1213         i_ret = v4l2_read( p_sys->i_fd, p_sys->p_buffers[0].start, p_sys->p_buffers[0].length );
1214         if( i_ret == -1 )
1215         {
1216             switch( errno )
1217             {
1218             case EAGAIN:
1219                 return 0;
1220             case EIO:
1221                 /* Could ignore EIO, see spec. */
1222                 /* fall through */
1223             default:
1224                 msg_Err( p_demux, "Failed to read frame" );
1225                 return 0;
1226                }
1227         }
1228
1229         p_block = ProcessVideoFrame( p_demux, (uint8_t*)p_sys->p_buffers[0].start, i_ret );
1230         if( !p_block ) return 0;
1231
1232         break;
1233
1234     case IO_METHOD_MMAP:
1235         memset( &buf, 0, sizeof(buf) );
1236         buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1237         buf.memory = V4L2_MEMORY_MMAP;
1238
1239         /* Wait for next frame */
1240         if (v4l2_ioctl( p_sys->i_fd, VIDIOC_DQBUF, &buf ) < 0 )
1241         {
1242             switch( errno )
1243             {
1244             case EAGAIN:
1245                 return 0;
1246             case EIO:
1247                 /* Could ignore EIO, see spec. */
1248                 /* fall through */
1249             default:
1250                 msg_Err( p_demux, "Failed to wait (VIDIOC_DQBUF)" );
1251                 return 0;
1252                }
1253         }
1254
1255         if( buf.index >= p_sys->i_nbuffers ) {
1256             msg_Err( p_demux, "Failed capturing new frame as i>=nbuffers" );
1257             return 0;
1258         }
1259
1260         p_block = ProcessVideoFrame( p_demux, p_sys->p_buffers[buf.index].start, buf.bytesused );
1261         if( !p_block ) return 0;
1262
1263         /* Unlock */
1264         if( v4l2_ioctl( p_sys->i_fd, VIDIOC_QBUF, &buf ) < 0 )
1265         {
1266             msg_Err( p_demux, "Failed to unlock (VIDIOC_QBUF)" );
1267             block_Release( p_block );
1268             return 0;
1269         }
1270
1271         break;
1272
1273     case IO_METHOD_USERPTR:
1274         memset( &buf, 0, sizeof(buf) );
1275         buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1276         buf.memory = V4L2_MEMORY_USERPTR;
1277
1278         /* Wait for next frame */
1279         if (v4l2_ioctl( p_sys->i_fd, VIDIOC_DQBUF, &buf ) < 0 )
1280         {
1281             switch( errno )
1282             {
1283             case EAGAIN:
1284                 return 0;
1285             case EIO:
1286                 /* Could ignore EIO, see spec. */
1287                 /* fall through */
1288             default:
1289                 msg_Err( p_demux, "Failed to wait (VIDIOC_DQBUF)" );
1290                 return 0;
1291             }
1292         }
1293
1294         /* Find frame? */
1295         unsigned int i;
1296         for( i = 0; i < p_sys->i_nbuffers; i++ )
1297         {
1298             if( buf.m.userptr == (unsigned long)p_sys->p_buffers[i].start &&
1299                 buf.length == p_sys->p_buffers[i].length ) break;
1300         }
1301
1302         if( i >= p_sys->i_nbuffers )
1303         {
1304             msg_Err( p_demux, "Failed capturing new frame as i>=nbuffers" );
1305             return 0;
1306         }
1307
1308         p_block = ProcessVideoFrame( p_demux, (uint8_t*)buf.m.userptr, buf.bytesused );
1309         if( !p_block ) return 0;
1310
1311         /* Unlock */
1312         if( v4l2_ioctl( p_sys->i_fd, VIDIOC_QBUF, &buf ) < 0 )
1313         {
1314             msg_Err( p_demux, "Failed to unlock (VIDIOC_QBUF)" );
1315             block_Release( p_block );
1316             return 0;
1317         }
1318
1319         break;
1320
1321     }
1322
1323     /* Timestamp */
1324     p_sys->i_video_pts = p_block->i_pts = p_block->i_dts = mdate();
1325
1326     return p_block;
1327 }
1328
1329 /*****************************************************************************
1330  * ProcessVideoFrame: Helper function to take a buffer and copy it into
1331  * a new block
1332  *****************************************************************************/
1333 static block_t* ProcessVideoFrame( demux_t *p_demux, uint8_t *p_frame, size_t i_size )
1334 {
1335     block_t *p_block;
1336
1337     if( !p_frame ) return 0;
1338
1339     /* New block */
1340     if( !( p_block = block_New( p_demux, i_size ) ) )
1341     {
1342         msg_Warn( p_demux, "Cannot get new block" );
1343         return 0;
1344     }
1345
1346     /* Copy frame */
1347     memcpy( p_block->p_buffer, p_frame, i_size );
1348
1349     return p_block;
1350 }
1351
1352 /*****************************************************************************
1353  * Helper function to initalise video IO using the Read method
1354  *****************************************************************************/
1355 static int InitRead( demux_t *p_demux, unsigned int i_buffer_size )
1356 {
1357     demux_sys_t *p_sys = p_demux->p_sys;
1358
1359     p_sys->p_buffers = calloc( 1, sizeof( *p_sys->p_buffers ) );
1360     if( !p_sys->p_buffers )
1361         return VLC_EGENERIC;
1362
1363     p_sys->p_buffers[0].length = i_buffer_size;
1364     p_sys->p_buffers[0].start = malloc( i_buffer_size );
1365     if( !p_sys->p_buffers[0].start )
1366         return VLC_ENOMEM;
1367
1368     return VLC_SUCCESS;
1369 }
1370
1371 /*****************************************************************************
1372  * Helper function to initalise video IO using the mmap method
1373  *****************************************************************************/
1374 static int InitMmap( demux_t *p_demux, int i_fd )
1375 {
1376     demux_sys_t *p_sys = p_demux->p_sys;
1377     struct v4l2_requestbuffers req;
1378
1379     memset( &req, 0, sizeof(req) );
1380     req.count = 4;
1381     req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1382     req.memory = V4L2_MEMORY_MMAP;
1383
1384     if( v4l2_ioctl( i_fd, VIDIOC_REQBUFS, &req ) < 0 )
1385     {
1386         msg_Err( p_demux, "device does not support mmap i/o" );
1387         goto open_failed;
1388     }
1389
1390     if( req.count < 2 )
1391     {
1392         msg_Err( p_demux, "Insufficient buffer memory" );
1393         goto open_failed;
1394     }
1395
1396     p_sys->p_buffers = calloc( req.count, sizeof( *p_sys->p_buffers ) );
1397     if( !p_sys->p_buffers )
1398         goto open_failed;
1399
1400     for( p_sys->i_nbuffers = 0; p_sys->i_nbuffers < req.count; ++p_sys->i_nbuffers )
1401     {
1402         struct v4l2_buffer buf;
1403
1404         memset( &buf, 0, sizeof(buf) );
1405         buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1406         buf.memory = V4L2_MEMORY_MMAP;
1407         buf.index = p_sys->i_nbuffers;
1408
1409         if( v4l2_ioctl( i_fd, VIDIOC_QUERYBUF, &buf ) < 0 )
1410         {
1411             msg_Err( p_demux, "VIDIOC_QUERYBUF" );
1412             goto open_failed;
1413         }
1414
1415         p_sys->p_buffers[p_sys->i_nbuffers].length = buf.length;
1416         p_sys->p_buffers[p_sys->i_nbuffers].start =
1417             v4l2_mmap( NULL, buf.length, PROT_READ | PROT_WRITE, MAP_SHARED, i_fd, buf.m.offset );
1418
1419         if( p_sys->p_buffers[p_sys->i_nbuffers].start == MAP_FAILED )
1420         {
1421             msg_Err( p_demux, "mmap failed (%m)" );
1422             goto open_failed;
1423         }
1424     }
1425
1426     return VLC_SUCCESS;
1427
1428 open_failed:
1429     return VLC_EGENERIC;
1430
1431 }
1432
1433 /*****************************************************************************
1434  * Helper function to initalise video IO using the userbuf method
1435  *****************************************************************************/
1436 static int InitUserP( demux_t *p_demux, int i_fd, unsigned int i_buffer_size )
1437 {
1438     demux_sys_t *p_sys = p_demux->p_sys;
1439     struct v4l2_requestbuffers req;
1440     unsigned int i_page_size;
1441
1442     i_page_size = sysconf(_SC_PAGESIZE);
1443     i_buffer_size = ( i_buffer_size + i_page_size - 1 ) & ~( i_page_size - 1);
1444
1445     memset( &req, 0, sizeof(req) );
1446     req.count = 4;
1447     req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1448     req.memory = V4L2_MEMORY_USERPTR;
1449
1450     if( v4l2_ioctl( i_fd, VIDIOC_REQBUFS, &req ) < 0 )
1451     {
1452         msg_Err( p_demux, "device does not support user pointer i/o" );
1453         return VLC_EGENERIC;
1454     }
1455
1456     p_sys->p_buffers = calloc( 4, sizeof( *p_sys->p_buffers ) );
1457     if( !p_sys->p_buffers )
1458         goto open_failed;
1459
1460     for( p_sys->i_nbuffers = 0; p_sys->i_nbuffers < 4; ++p_sys->i_nbuffers )
1461     {
1462         p_sys->p_buffers[p_sys->i_nbuffers].length = i_buffer_size;
1463         if( posix_memalign( &p_sys->p_buffers[p_sys->i_nbuffers].start,
1464                 /* boundary */ i_page_size, i_buffer_size ) )
1465             goto open_failed;
1466     }
1467
1468     return VLC_SUCCESS;
1469
1470 open_failed:
1471     free( p_sys->p_buffers );
1472     return VLC_EGENERIC;
1473
1474 }
1475
1476 /*****************************************************************************
1477  * IsPixelFormatSupported: returns true if the specified V4L2 pixel format is
1478  * in the array of supported formats returned by the driver
1479  *****************************************************************************/
1480 static bool IsPixelFormatSupported( demux_t *p_demux, unsigned int i_pixelformat )
1481 {
1482     demux_sys_t *p_sys = p_demux->p_sys;
1483
1484     for( int i_index = 0; i_index < p_sys->i_codec; i_index++ )
1485     {
1486         if( p_sys->p_codecs[i_index].pixelformat == i_pixelformat )
1487             return true;
1488     }
1489
1490     return false;
1491 }
1492
1493 static float GetMaxFrameRate( demux_t *p_demux, int i_fd,
1494                               uint32_t i_pixel_format,
1495                               uint32_t i_width, uint32_t i_height )
1496 {
1497     (void)p_demux;
1498 #ifdef VIDIOC_ENUM_FRAMEINTERVALS
1499     /* This is new in Linux 2.6.19 */
1500     struct v4l2_frmivalenum frmival;
1501     frmival.index = 0;
1502     frmival.pixel_format = i_pixel_format;
1503     frmival.width = i_width;
1504     frmival.height = i_height;
1505     if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMEINTERVALS, &frmival ) >= 0 )
1506     {
1507         switch( frmival.type )
1508         {
1509             case V4L2_FRMIVAL_TYPE_DISCRETE:
1510             {
1511                 float f_fps_max = -1;
1512                 do
1513                 {
1514                     float f_fps = (float)frmival.discrete.denominator
1515                                 / (float)frmival.discrete.numerator;
1516                     if( f_fps > f_fps_max ) f_fps_max = f_fps;
1517                     frmival.index++;
1518                 } while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMEINTERVALS,
1519                                      &frmival ) >= 0 );
1520                 return f_fps_max;
1521             }
1522             case V4L2_FRMSIZE_TYPE_STEPWISE:
1523             case V4L2_FRMIVAL_TYPE_CONTINUOUS:
1524                 return __MAX( (float)frmival.stepwise.max.denominator
1525                             / (float)frmival.stepwise.max.numerator,
1526                               (float)frmival.stepwise.min.denominator
1527                             / (float)frmival.stepwise.min.numerator );
1528         }
1529     }
1530 #endif
1531     return -1.;
1532 }
1533
1534 static float GetAbsoluteMaxFrameRate( demux_t *p_demux, int i_fd,
1535                                       uint32_t i_pixel_format )
1536 {
1537     float f_fps_max = -1.;
1538 #ifdef VIDIOC_ENUM_FRAMESIZES
1539     /* This is new in Linux 2.6.19 */
1540     struct v4l2_frmsizeenum frmsize;
1541     frmsize.index = 0;
1542     frmsize.pixel_format = i_pixel_format;
1543     if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES, &frmsize ) >= 0 )
1544     {
1545         switch( frmsize.type )
1546         {
1547             case V4L2_FRMSIZE_TYPE_DISCRETE:
1548                 do
1549                 {
1550                     frmsize.index++;
1551                     float f_fps = GetMaxFrameRate( p_demux, i_fd,
1552                                                    i_pixel_format,
1553                                                    frmsize.discrete.width,
1554                                                    frmsize.discrete.height );
1555                     if( f_fps > f_fps_max ) f_fps_max = f_fps;
1556                 } while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES,
1557                          &frmsize ) >= 0 );
1558                 break;
1559             case V4L2_FRMSIZE_TYPE_STEPWISE:
1560             {
1561                 uint32_t i_width = frmsize.stepwise.min_width;
1562                 uint32_t i_height = frmsize.stepwise.min_height;
1563                 for( ;
1564                      i_width <= frmsize.stepwise.max_width &&
1565                      i_height <= frmsize.stepwise.max_width;
1566                      i_width += frmsize.stepwise.step_width,
1567                      i_height += frmsize.stepwise.step_height )
1568                 {
1569                     float f_fps = GetMaxFrameRate( p_demux, i_fd,
1570                                                    i_pixel_format,
1571                                                    i_width, i_height );
1572                     if( f_fps > f_fps_max ) f_fps_max = f_fps;
1573                 }
1574                 break;
1575             }
1576             case V4L2_FRMSIZE_TYPE_CONTINUOUS:
1577                 /* FIXME */
1578                 msg_Err( p_demux, "GetAbsoluteMaxFrameRate implementation for V4L2_FRMSIZE_TYPE_CONTINUOUS isn't correct" );
1579                  f_fps_max = GetMaxFrameRate( p_demux, i_fd,
1580                                               i_pixel_format,
1581                                               frmsize.stepwise.max_width,
1582                                               frmsize.stepwise.max_height );
1583                 break;
1584         }
1585     }
1586 #endif
1587     return f_fps_max;
1588 }
1589
1590 static void GetMaxDimensions( demux_t *p_demux, int i_fd,
1591                               uint32_t i_pixel_format, float f_fps_min,
1592                               uint32_t *pi_width, uint32_t *pi_height )
1593 {
1594     *pi_width = 0;
1595     *pi_height = 0;
1596 #ifdef VIDIOC_ENUM_FRAMESIZES
1597     /* This is new in Linux 2.6.19 */
1598     struct v4l2_frmsizeenum frmsize;
1599     frmsize.index = 0;
1600     frmsize.pixel_format = i_pixel_format;
1601     if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES, &frmsize ) >= 0 )
1602     {
1603         switch( frmsize.type )
1604         {
1605             case V4L2_FRMSIZE_TYPE_DISCRETE:
1606                 do
1607                 {
1608                     frmsize.index++;
1609                     float f_fps = GetMaxFrameRate( p_demux, i_fd,
1610                                                    i_pixel_format,
1611                                                    frmsize.discrete.width,
1612                                                    frmsize.discrete.height );
1613                     if( f_fps >= f_fps_min &&
1614                         frmsize.discrete.width > *pi_width )
1615                     {
1616                         *pi_width = frmsize.discrete.width;
1617                         *pi_height = frmsize.discrete.height;
1618                     }
1619                 } while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES,
1620                          &frmsize ) >= 0 );
1621                 break;
1622             case V4L2_FRMSIZE_TYPE_STEPWISE:
1623             {
1624                 uint32_t i_width = frmsize.stepwise.min_width;
1625                 uint32_t i_height = frmsize.stepwise.min_height;
1626                 for( ;
1627                      i_width <= frmsize.stepwise.max_width &&
1628                      i_height <= frmsize.stepwise.max_width;
1629                      i_width += frmsize.stepwise.step_width,
1630                      i_height += frmsize.stepwise.step_height )
1631                 {
1632                     float f_fps = GetMaxFrameRate( p_demux, i_fd,
1633                                                    i_pixel_format,
1634                                                    i_width, i_height );
1635                     if( f_fps >= f_fps_min && i_width > *pi_width )
1636                     {
1637                         *pi_width = i_width;
1638                         *pi_height = i_height;
1639                     }
1640                 }
1641                 break;
1642             }
1643             case V4L2_FRMSIZE_TYPE_CONTINUOUS:
1644                 /* FIXME */
1645                 msg_Err( p_demux, "GetMaxDimension implementation for V4L2_FRMSIZE_TYPE_CONTINUOUS isn't correct" );
1646                 float f_fps = GetMaxFrameRate( p_demux, i_fd,
1647                                                i_pixel_format,
1648                                                frmsize.stepwise.max_width,
1649                                                frmsize.stepwise.max_height );
1650                 if( f_fps >= f_fps_min &&
1651                     frmsize.stepwise.max_width > *pi_width )
1652                 {
1653                     *pi_width = frmsize.stepwise.max_width;
1654                     *pi_height = frmsize.stepwise.max_height;
1655                 }
1656                 break;
1657         }
1658     }
1659 #endif
1660 }
1661
1662 /*****************************************************************************
1663  * OpenVideoDev: open and set up the video device and probe for capabilities
1664  *****************************************************************************/
1665 static int OpenVideoDev( vlc_object_t *p_obj, demux_sys_t *p_sys, bool b_demux )
1666 {
1667     int i_fd;
1668     struct v4l2_cropcap cropcap;
1669     struct v4l2_crop crop;
1670     struct v4l2_format fmt;
1671     unsigned int i_min;
1672     enum v4l2_buf_type buf_type;
1673     const char *psz_device = p_sys->psz_device;
1674     es_format_t es_fmt;
1675     int libv4l2_fd;
1676
1677     if( ( i_fd = open( psz_device, O_RDWR ) ) < 0 )
1678     {
1679         msg_Err( p_obj, "cannot open device (%m)" );
1680         goto open_failed;
1681     }
1682
1683 #ifdef HAVE_LIBV4L2
1684     /* Note the v4l2_xxx functions are designed so that if they get passed an
1685        unknown fd, the will behave exactly as their regular xxx counterparts,
1686        so if v4l2_fd_open fails, we continue as normal (missing the libv4l2
1687        custom cam format to normal formats conversion). Chances are big we will
1688        still fail then though, as normally v4l2_fd_open only fails if the
1689        device is not a v4l2 device. */
1690     libv4l2_fd = v4l2_fd_open( i_fd, V4L2_ENABLE_ENUM_FMT_EMULATION );
1691     if( libv4l2_fd != -1 )
1692         i_fd = libv4l2_fd;
1693 #else
1694     libv4l2_fd = i_fd;
1695 #endif
1696
1697     /* Tune the tuner */
1698     if( p_sys->i_frequency >= 0 )
1699     {
1700         if( p_sys->i_cur_tuner < 0 || p_sys->i_cur_tuner >= p_sys->i_tuner )
1701         {
1702             msg_Err( p_obj, "invalid tuner %d.", p_sys->i_cur_tuner );
1703             goto open_failed;
1704         }
1705         struct v4l2_frequency frequency;
1706         memset( &frequency, 0, sizeof( frequency ) );
1707         frequency.tuner = p_sys->i_cur_tuner;
1708         frequency.type = p_sys->p_tuners[p_sys->i_cur_tuner].type;
1709         frequency.frequency = p_sys->i_frequency / 62.5;
1710         if( v4l2_ioctl( i_fd, VIDIOC_S_FREQUENCY, &frequency ) < 0 )
1711         {
1712             msg_Err( p_obj, "cannot set tuner frequency (%m)" );
1713             goto open_failed;
1714         }
1715         msg_Dbg( p_obj, "Tuner frequency set" );
1716     }
1717
1718     /* Set the tuner's audio mode */
1719     if( p_sys->i_audio_mode >= 0 )
1720     {
1721         if( p_sys->i_cur_tuner < 0 || p_sys->i_cur_tuner >= p_sys->i_tuner )
1722         {
1723             msg_Err( p_obj, "invalid tuner %d.", p_sys->i_cur_tuner );
1724             goto open_failed;
1725         }
1726         struct v4l2_tuner tuner;
1727         memset( &tuner, 0, sizeof( tuner ) );
1728         tuner.index = p_sys->i_cur_tuner;
1729         tuner.audmode = p_sys->i_audio_mode;
1730         if( v4l2_ioctl( i_fd, VIDIOC_S_TUNER, &tuner ) < 0 )
1731         {
1732             msg_Err( p_obj, "cannot set tuner audio mode (%m)" );
1733             goto open_failed;
1734         }
1735         msg_Dbg( p_obj, "Tuner audio mode set" );
1736     }
1737
1738     /* Select standard */
1739
1740     if( p_sys->i_selected_standard_id != V4L2_STD_UNKNOWN )
1741     {
1742         if( v4l2_ioctl( i_fd, VIDIOC_S_STD, &p_sys->i_selected_standard_id ) < 0 )
1743         {
1744             msg_Err( p_obj, "cannot set standard (%m)" );
1745             goto open_failed;
1746         }
1747         msg_Dbg( p_obj, "Set standard" );
1748     }
1749
1750     /* Select input */
1751
1752     if( p_sys->i_selected_input >= p_sys->i_input )
1753     {
1754         msg_Warn( p_obj, "invalid input. Using the default one" );
1755         p_sys->i_selected_input = 0;
1756     }
1757
1758     if( v4l2_ioctl( i_fd, VIDIOC_S_INPUT, &p_sys->i_selected_input ) < 0 )
1759     {
1760         msg_Err( p_obj, "cannot set input (%m)" );
1761         goto open_failed;
1762     }
1763
1764     /* Set audio input */
1765
1766     if( p_sys->i_audio > 0 )
1767     {
1768         if( p_sys->i_selected_audio_input < 0
1769          || p_sys->i_selected_audio_input >= p_sys->i_audio )
1770         {
1771             msg_Warn( p_obj, "invalid audio input. Using the default one" );
1772             p_sys->i_selected_audio_input = 0;
1773         }
1774
1775         if( v4l2_ioctl( i_fd, VIDIOC_S_AUDIO, &p_sys->p_audios[p_sys->i_selected_audio_input] ) < 0 )
1776         {
1777             msg_Err( p_obj, "cannot set audio input (%m)" );
1778             goto open_failed;
1779         }
1780         msg_Dbg( p_obj, "Audio input set to %d", p_sys->i_selected_audio_input );
1781     }
1782
1783
1784     /* TODO: Move the resolution stuff up here */
1785     /* if MPEG encoder card, no need to do anything else after this */
1786     ControlList( p_obj, i_fd,
1787                   var_GetBool( p_obj, "v4l2-controls-reset" ), b_demux );
1788     SetAvailControlsByString( p_obj, p_sys, i_fd );
1789     if( false == b_demux)
1790     {
1791         return i_fd;
1792     }
1793
1794     demux_t *p_demux = (demux_t *) p_obj;
1795
1796     /* Verify device support for the various IO methods */
1797     switch( p_sys->io )
1798     {
1799         case IO_METHOD_READ:
1800             if( !(p_sys->dev_cap.capabilities & V4L2_CAP_READWRITE) )
1801             {
1802                 msg_Err( p_demux, "device does not support read i/o" );
1803                 goto open_failed;
1804             }
1805             break;
1806
1807         case IO_METHOD_MMAP:
1808         case IO_METHOD_USERPTR:
1809             if( !(p_sys->dev_cap.capabilities & V4L2_CAP_STREAMING) )
1810             {
1811                 msg_Err( p_demux, "device does not support streaming i/o" );
1812                 goto open_failed;
1813             }
1814             break;
1815
1816         default:
1817             msg_Err( p_demux, "io method not supported" );
1818             goto open_failed;
1819     }
1820
1821     /* Reset Cropping */
1822     memset( &cropcap, 0, sizeof(cropcap) );
1823     cropcap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1824     if( v4l2_ioctl( i_fd, VIDIOC_CROPCAP, &cropcap ) >= 0 )
1825     {
1826         crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1827         crop.c = cropcap.defrect; /* reset to default */
1828         if( v4l2_ioctl( i_fd, VIDIOC_S_CROP, &crop ) < 0 )
1829         {
1830             switch( errno )
1831             {
1832                 case EINVAL:
1833                     /* Cropping not supported. */
1834                     break;
1835                 default:
1836                     /* Errors ignored. */
1837                     break;
1838             }
1839         }
1840     }
1841
1842     /* Try and find default resolution if not specified */
1843     memset( &fmt, 0, sizeof(fmt) );
1844     fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1845
1846     if( p_sys->i_width == 0 || p_sys->i_height == 0 )
1847     {
1848         /* Use current width and height settings */
1849         if( v4l2_ioctl( i_fd, VIDIOC_G_FMT, &fmt ) < 0 )
1850         {
1851             msg_Err( p_demux, "Cannot get default width and height." );
1852             goto open_failed;
1853         }
1854
1855         p_sys->i_width = fmt.fmt.pix.width;
1856         p_sys->i_height = fmt.fmt.pix.height;
1857
1858         if( fmt.fmt.pix.field == V4L2_FIELD_ALTERNATE )
1859         {
1860             p_sys->i_height = p_sys->i_height * 2;
1861         }
1862     }
1863     else if( p_sys->i_width < 0 || p_sys->i_height < 0 )
1864     {
1865         msg_Dbg( p_demux, "will try to find optimal width and height." );
1866     }
1867     else
1868     {
1869         /* Use user specified width and height */
1870         msg_Dbg( p_demux, "trying specified size %dx%d", p_sys->i_width, p_sys->i_height );
1871     }
1872
1873     fmt.fmt.pix.width = p_sys->i_width;
1874     fmt.fmt.pix.height = p_sys->i_height;
1875     fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
1876
1877     /* Test and set Chroma */
1878     fmt.fmt.pix.pixelformat = 0;
1879     if( p_sys->psz_requested_chroma && strlen( p_sys->psz_requested_chroma ) > 0 )
1880     {
1881         /* User specified chroma */
1882         if( strlen( p_sys->psz_requested_chroma ) >= 4 )
1883         {
1884             int i_requested_fourcc = VLC_FOURCC(
1885                 p_sys->psz_requested_chroma[0], p_sys->psz_requested_chroma[1],
1886                 p_sys->psz_requested_chroma[2], p_sys->psz_requested_chroma[3] );
1887             for( int i = 0; v4l2chroma_to_fourcc[i].i_v4l2 != 0; i++ )
1888             {
1889                 if( v4l2chroma_to_fourcc[i].i_fourcc == i_requested_fourcc )
1890                 {
1891                     fmt.fmt.pix.pixelformat = v4l2chroma_to_fourcc[i].i_v4l2;
1892                     break;
1893                 }
1894             }
1895         }
1896         /* Try and set user chroma */
1897         if( !IsPixelFormatSupported( p_demux, fmt.fmt.pix.pixelformat ) || ( fmt.fmt.pix.pixelformat && v4l2_ioctl( i_fd, VIDIOC_S_FMT, &fmt ) < 0 ) )
1898         {
1899             msg_Warn( p_demux, "Driver is unable to use specified chroma %s. Trying defaults.", p_sys->psz_requested_chroma );
1900             fmt.fmt.pix.pixelformat = 0;
1901         }
1902     }
1903
1904     /* If no user specified chroma, find best */
1905     /* This also decides if MPEG encoder card or not */
1906     if( !fmt.fmt.pix.pixelformat )
1907     {
1908         unsigned int i;
1909         for( i = 0; i < ARRAY_SIZE( p_chroma_fallbacks ); i++ )
1910         {
1911             fmt.fmt.pix.pixelformat = p_chroma_fallbacks[i];
1912             if( IsPixelFormatSupported( p_demux, fmt.fmt.pix.pixelformat )
1913              && v4l2_ioctl( i_fd, VIDIOC_S_FMT, &fmt ) >= 0 )
1914                 break;
1915         }
1916         if( i == ARRAY_SIZE( p_chroma_fallbacks ) )
1917         {
1918             msg_Warn( p_demux, "Could not select any of the default chromas; attempting to open as MPEG encoder card (access)" );
1919             goto open_failed;
1920         }
1921     }
1922
1923     if( p_sys->i_width < 0 || p_sys->i_height < 0 )
1924     {
1925         if( p_sys->f_fps <= 0 )
1926         {
1927             p_sys->f_fps = GetAbsoluteMaxFrameRate( p_demux, i_fd,
1928                                                     fmt.fmt.pix.pixelformat );
1929             msg_Dbg( p_demux, "Found maximum framerate of %f", p_sys->f_fps );
1930         }
1931         GetMaxDimensions( p_demux, i_fd,
1932                           fmt.fmt.pix.pixelformat, p_sys->f_fps,
1933                           &fmt.fmt.pix.width, &fmt.fmt.pix.height );
1934         msg_Dbg( p_demux, "Found optimal dimensions for framerate %f of %dx%d",
1935                  p_sys->f_fps, fmt.fmt.pix.width, fmt.fmt.pix.height );
1936         if( v4l2_ioctl( i_fd, VIDIOC_S_FMT, &fmt ) < 0 ) {;}
1937     }
1938
1939     /* Reassign width, height and chroma incase driver override */
1940     p_sys->i_width = fmt.fmt.pix.width;
1941     p_sys->i_height = fmt.fmt.pix.height;
1942
1943     /* Look up final fourcc */
1944     p_sys->i_fourcc = 0;
1945     for( int i = 0; v4l2chroma_to_fourcc[i].i_fourcc != 0; i++ )
1946     {
1947         if( v4l2chroma_to_fourcc[i].i_v4l2 == fmt.fmt.pix.pixelformat )
1948         {
1949             p_sys->i_fourcc = v4l2chroma_to_fourcc[i].i_fourcc;
1950             es_format_Init( &es_fmt, VIDEO_ES, p_sys->i_fourcc );
1951             es_fmt.video.i_rmask = v4l2chroma_to_fourcc[i].i_rmask;
1952             es_fmt.video.i_gmask = v4l2chroma_to_fourcc[i].i_gmask;
1953             es_fmt.video.i_bmask = v4l2chroma_to_fourcc[i].i_bmask;
1954             break;
1955         }
1956     }
1957
1958     /* Buggy driver paranoia */
1959     i_min = fmt.fmt.pix.width * 2;
1960     if( fmt.fmt.pix.bytesperline < i_min )
1961         fmt.fmt.pix.bytesperline = i_min;
1962     i_min = fmt.fmt.pix.bytesperline * fmt.fmt.pix.height;
1963     if( fmt.fmt.pix.sizeimage < i_min )
1964         fmt.fmt.pix.sizeimage = i_min;
1965
1966 #ifdef VIDIOC_ENUM_FRAMEINTERVALS
1967     /* This is new in Linux 2.6.19 */
1968     /* List supported frame rates */
1969     struct v4l2_frmivalenum frmival;
1970     frmival.index = 0;
1971     frmival.pixel_format = fmt.fmt.pix.pixelformat;
1972     frmival.width = p_sys->i_width;
1973     frmival.height = p_sys->i_height;
1974     if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMEINTERVALS, &frmival ) >= 0 )
1975     {
1976         char psz_fourcc[5];
1977         memset( &psz_fourcc, 0, sizeof( psz_fourcc ) );
1978         vlc_fourcc_to_char( p_sys->i_fourcc, &psz_fourcc );
1979         msg_Dbg( p_demux, "supported frame intervals for %4s, %dx%d:",
1980                  psz_fourcc, frmival.width, frmival.height );
1981         switch( frmival.type )
1982         {
1983             case V4L2_FRMIVAL_TYPE_DISCRETE:
1984                 do
1985                 {
1986                     msg_Dbg( p_demux, "    supported frame interval: %d/%d",
1987                              frmival.discrete.numerator,
1988                              frmival.discrete.denominator );
1989                     frmival.index++;
1990                 } while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMEINTERVALS, &frmival ) >= 0 );
1991                 break;
1992             case V4L2_FRMIVAL_TYPE_STEPWISE:
1993                 msg_Dbg( p_demux, "    supported frame intervals: %d/%d to "
1994                          "%d/%d using %d/%d increments",
1995                          frmival.stepwise.min.numerator,
1996                          frmival.stepwise.min.denominator,
1997                          frmival.stepwise.max.numerator,
1998                          frmival.stepwise.max.denominator,
1999                          frmival.stepwise.step.numerator,
2000                          frmival.stepwise.step.denominator );
2001                 break;
2002             case V4L2_FRMIVAL_TYPE_CONTINUOUS:
2003                 msg_Dbg( p_demux, "    supported frame intervals: %d/%d to %d/%d",
2004                          frmival.stepwise.min.numerator,
2005                          frmival.stepwise.min.denominator,
2006                          frmival.stepwise.max.numerator,
2007                          frmival.stepwise.max.denominator );
2008                 break;
2009         }
2010     }
2011 #endif
2012
2013
2014     /* Init IO method */
2015     switch( p_sys->io )
2016     {
2017     case IO_METHOD_READ:
2018         if( InitRead( p_demux, fmt.fmt.pix.sizeimage ) != VLC_SUCCESS ) goto open_failed;
2019         break;
2020
2021     case IO_METHOD_MMAP:
2022         if( InitMmap( p_demux, i_fd ) != VLC_SUCCESS ) goto open_failed;
2023         break;
2024
2025     case IO_METHOD_USERPTR:
2026         if( InitUserP( p_demux, i_fd, fmt.fmt.pix.sizeimage ) != VLC_SUCCESS ) goto open_failed;
2027         break;
2028
2029     }
2030
2031     /* Add */
2032     es_fmt.video.i_width  = p_sys->i_width;
2033     es_fmt.video.i_height = p_sys->i_height;
2034     es_fmt.video.i_aspect = 4 * VOUT_ASPECT_FACTOR / 3;
2035
2036     msg_Dbg( p_demux, "added new video es %4.4s %dx%d",
2037         (char*)&es_fmt.i_codec, es_fmt.video.i_width, es_fmt.video.i_height );
2038     p_sys->p_es = es_out_Add( p_demux->out, &es_fmt );
2039
2040     /* Start Capture */
2041
2042     switch( p_sys->io )
2043     {
2044     case IO_METHOD_READ:
2045         /* Nothing to do */
2046         break;
2047
2048     case IO_METHOD_MMAP:
2049         for (unsigned int i = 0; i < p_sys->i_nbuffers; ++i)
2050         {
2051             struct v4l2_buffer buf;
2052
2053             memset( &buf, 0, sizeof(buf) );
2054             buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2055             buf.memory = V4L2_MEMORY_MMAP;
2056             buf.index = i;
2057
2058             if( v4l2_ioctl( i_fd, VIDIOC_QBUF, &buf ) < 0 )
2059             {
2060                 msg_Err( p_demux, "VIDIOC_QBUF failed" );
2061                 goto open_failed;
2062             }
2063         }
2064
2065         buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2066         if( v4l2_ioctl( i_fd, VIDIOC_STREAMON, &buf_type ) < 0 )
2067         {
2068             msg_Err( p_demux, "VIDIOC_STREAMON failed" );
2069             goto open_failed;
2070         }
2071
2072         break;
2073
2074     case IO_METHOD_USERPTR:
2075         for( unsigned int i = 0; i < p_sys->i_nbuffers; ++i )
2076         {
2077             struct v4l2_buffer buf;
2078
2079             memset( &buf, 0, sizeof(buf) );
2080             buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2081             buf.memory = V4L2_MEMORY_USERPTR;
2082             buf.index = i;
2083             buf.m.userptr = (unsigned long)p_sys->p_buffers[i].start;
2084             buf.length = p_sys->p_buffers[i].length;
2085
2086             if( v4l2_ioctl( i_fd, VIDIOC_QBUF, &buf ) < 0 )
2087             {
2088                 msg_Err( p_demux, "VIDIOC_QBUF failed" );
2089                 goto open_failed;
2090             }
2091         }
2092
2093         buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2094         if( v4l2_ioctl( i_fd, VIDIOC_STREAMON, &buf_type ) < 0 )
2095         {
2096             msg_Err( p_demux, "VIDIOC_STREAMON failed" );
2097             goto open_failed;
2098         }
2099
2100         break;
2101     }
2102
2103     /* report fps */
2104     if( p_sys->f_fps >= 0.1 )
2105     {
2106         msg_Dbg( p_demux, "User set fps=%f", p_sys->f_fps );
2107     }
2108
2109     return i_fd;
2110
2111 open_failed:
2112     if( i_fd >= 0 ) v4l2_close( i_fd );
2113     return -1;
2114
2115 }
2116
2117 /*****************************************************************************
2118  * ProbeVideoDev: probe video for capabilities
2119  *****************************************************************************/
2120 static bool ProbeVideoDev( vlc_object_t *p_obj, demux_sys_t *p_sys,
2121                                  const char *psz_device )
2122 {
2123     int i_index;
2124     int i_standard;
2125
2126     int i_fd;
2127     int libv4l2_fd;
2128
2129     if( ( i_fd = open( psz_device, O_RDWR ) ) < 0 )
2130     {
2131         msg_Err( p_obj, "cannot open video device '%s' (%m)", psz_device );
2132         goto open_failed;
2133     }
2134
2135 #ifdef HAVE_LIBV4L2
2136     /* Note the v4l2_xxx functions are designed so that if they get passed an
2137        unknown fd, the will behave exactly as their regular xxx counterparts,
2138        so if v4l2_fd_open fails, we continue as normal (missing the libv4l2
2139        custom cam format to normal formats conversion). Chances are big we will
2140        still fail then though, as normally v4l2_fd_open only fails if the
2141        device is not a v4l2 device. */
2142     libv4l2_fd = v4l2_fd_open( i_fd, V4L2_ENABLE_ENUM_FMT_EMULATION );
2143     if( libv4l2_fd != -1 )
2144         i_fd = libv4l2_fd;
2145 #else
2146     libv4l2_fd = i_fd;
2147 #endif
2148
2149     /* Get device capabilites */
2150
2151     if( v4l2_ioctl( i_fd, VIDIOC_QUERYCAP, &p_sys->dev_cap ) < 0 )
2152     {
2153         msg_Err( p_obj, "cannot get video capabilities (%m)" );
2154         goto open_failed;
2155     }
2156
2157     msg_Dbg( p_obj, "V4L2 device: %s using driver: %s (version: %u.%u.%u) on %s",
2158                             p_sys->dev_cap.card,
2159                             p_sys->dev_cap.driver,
2160                             (p_sys->dev_cap.version >> 16) & 0xFF,
2161                             (p_sys->dev_cap.version >> 8) & 0xFF,
2162                             p_sys->dev_cap.version & 0xFF,
2163                             p_sys->dev_cap.bus_info );
2164
2165     msg_Dbg( p_obj, "the device has the capabilities: (%c) Video Capure, "
2166                                                        "(%c) Audio, "
2167                                                        "(%c) Tuner",
2168              ( p_sys->dev_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE  ? 'X':' '),
2169              ( p_sys->dev_cap.capabilities & V4L2_CAP_AUDIO  ? 'X':' '),
2170              ( p_sys->dev_cap.capabilities & V4L2_CAP_TUNER  ? 'X':' ') );
2171
2172     msg_Dbg( p_obj, "supported I/O methods are: (%c) Read/Write, "
2173                                                  "(%c) Streaming, "
2174                                                  "(%c) Asynchronous",
2175             ( p_sys->dev_cap.capabilities & V4L2_CAP_READWRITE ? 'X':' ' ),
2176             ( p_sys->dev_cap.capabilities & V4L2_CAP_STREAMING ? 'X':' ' ),
2177             ( p_sys->dev_cap.capabilities & V4L2_CAP_ASYNCIO ? 'X':' ' ) );
2178
2179     /* Now, enumerate all the video inputs. This is useless at the moment
2180        since we have no way to present that info to the user except with
2181        debug messages */
2182
2183     if( p_sys->dev_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE )
2184     {
2185         struct v4l2_input t_input;
2186         t_input.index = 0;
2187         while( v4l2_ioctl( i_fd, VIDIOC_ENUMINPUT, &t_input ) >= 0 )
2188         {
2189             p_sys->i_input++;
2190             t_input.index = p_sys->i_input;
2191         }
2192
2193         p_sys->p_inputs = calloc( 1, p_sys->i_input * sizeof( struct v4l2_input ) );
2194         if( !p_sys->p_inputs ) goto open_failed;
2195
2196         for( i_index = 0; i_index < p_sys->i_input; i_index++ )
2197         {
2198             p_sys->p_inputs[i_index].index = i_index;
2199
2200             if( v4l2_ioctl( i_fd, VIDIOC_ENUMINPUT, &p_sys->p_inputs[i_index] ) )
2201             {
2202                 msg_Err( p_obj, "cannot get video input characteristics (%m)" );
2203                 goto open_failed;
2204             }
2205             msg_Dbg( p_obj, "video input %i (%s) has type: %s %c",
2206                                 i_index,
2207                                 p_sys->p_inputs[i_index].name,
2208                                 p_sys->p_inputs[i_index].type
2209                                         == V4L2_INPUT_TYPE_TUNER ?
2210                                         "Tuner adapter" :
2211                                         "External analog input",
2212                                 i_index == p_sys->i_selected_input ? '*' : ' ' );
2213         }
2214     }
2215
2216     /* Probe video standards */
2217     if( p_sys->dev_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE )
2218     {
2219         struct v4l2_standard t_standards;
2220         t_standards.index = 0;
2221         while( v4l2_ioctl( i_fd, VIDIOC_ENUMSTD, &t_standards ) >=0 )
2222         {
2223             p_sys->i_standard++;
2224             t_standards.index = p_sys->i_standard;
2225         }
2226
2227         p_sys->p_standards = calloc( 1, p_sys->i_standard * sizeof( struct v4l2_standard ) );
2228         if( !p_sys->p_standards ) goto open_failed;
2229
2230         for( i_standard = 0; i_standard < p_sys->i_standard; i_standard++ )
2231         {
2232             p_sys->p_standards[i_standard].index = i_standard;
2233
2234             if( v4l2_ioctl( i_fd, VIDIOC_ENUMSTD, &p_sys->p_standards[i_standard] ) )
2235             {
2236                 msg_Err( p_obj, "cannot get video input standards (%m)" );
2237                 goto open_failed;
2238             }
2239             msg_Dbg( p_obj, "video standard %i is: %s %c",
2240                                 i_standard,
2241                                 p_sys->p_standards[i_standard].name,
2242                                 (unsigned)i_standard == p_sys->i_selected_standard_id ? '*' : ' ' );
2243         }
2244     }
2245
2246     /* initialize the structures for the ioctls */
2247     for( i_index = 0; i_index < 32; i_index++ )
2248     {
2249         p_sys->p_audios[i_index].index = i_index;
2250     }
2251
2252     /* Probe audio inputs */
2253     if( p_sys->dev_cap.capabilities & V4L2_CAP_AUDIO )
2254     {
2255         while( p_sys->i_audio < 32 &&
2256                v4l2_ioctl( i_fd, VIDIOC_S_AUDIO, &p_sys->p_audios[p_sys->i_audio] ) >= 0 )
2257         {
2258             if( v4l2_ioctl( i_fd, VIDIOC_G_AUDIO, &p_sys->p_audios[ p_sys->i_audio] ) < 0 )
2259             {
2260                 msg_Err( p_obj, "cannot get audio input characteristics (%m)" );
2261                 goto open_failed;
2262             }
2263
2264             msg_Dbg( p_obj, "audio input %i (%s) is %s %s %c",
2265                                 p_sys->i_audio,
2266                                 p_sys->p_audios[p_sys->i_audio].name,
2267                                 p_sys->p_audios[p_sys->i_audio].capability &
2268                                                     V4L2_AUDCAP_STEREO ?
2269                                         "Stereo" : "Mono",
2270                                 p_sys->p_audios[p_sys->i_audio].capability &
2271                                                     V4L2_AUDCAP_AVL ?
2272                                     "(Automatic Volume Level supported)" : "",
2273                                 p_sys->i_audio == p_sys->i_selected_audio_input ? '*' : ' ' );
2274
2275             p_sys->i_audio++;
2276         }
2277     }
2278
2279     /* List tuner caps */
2280     if( p_sys->dev_cap.capabilities & V4L2_CAP_TUNER )
2281     {
2282         struct v4l2_tuner tuner;
2283         memset( &tuner, 0, sizeof(tuner) );
2284         while( v4l2_ioctl( i_fd, VIDIOC_G_TUNER, &tuner ) >= 0 )
2285         {
2286             p_sys->i_tuner++;
2287             memset( &tuner, 0, sizeof(tuner) );
2288             tuner.index = p_sys->i_tuner;
2289         }
2290
2291         p_sys->p_tuners = calloc( 1, p_sys->i_tuner * sizeof( struct v4l2_tuner ) );
2292         if( !p_sys->p_tuners ) goto open_failed;
2293
2294         for( i_index = 0; i_index < p_sys->i_tuner; i_index++ )
2295         {
2296             p_sys->p_tuners[i_index].index = i_index;
2297
2298             if( v4l2_ioctl( i_fd, VIDIOC_G_TUNER, &p_sys->p_tuners[i_index] ) )
2299             {
2300                 msg_Err( p_obj, "cannot get tuner characteristics (%m)" );
2301                 goto open_failed;
2302             }
2303             msg_Dbg( p_obj, "tuner %i (%s) has type: %s, "
2304                               "frequency range: %.1f %s -> %.1f %s",
2305                                 i_index,
2306                                 p_sys->p_tuners[i_index].name,
2307                                 p_sys->p_tuners[i_index].type
2308                                         == V4L2_TUNER_RADIO ?
2309                                         "Radio" : "Analog TV",
2310                                 p_sys->p_tuners[i_index].rangelow * 62.5,
2311                                 p_sys->p_tuners[i_index].capability &
2312                                         V4L2_TUNER_CAP_LOW ?
2313                                         "Hz" : "kHz",
2314                                 p_sys->p_tuners[i_index].rangehigh * 62.5,
2315                                 p_sys->p_tuners[i_index].capability &
2316                                         V4L2_TUNER_CAP_LOW ?
2317                                         "Hz" : "kHz" );
2318
2319             struct v4l2_frequency frequency;
2320             memset( &frequency, 0, sizeof( frequency ) );
2321             if( v4l2_ioctl( i_fd, VIDIOC_G_FREQUENCY, &frequency ) < 0 )
2322             {
2323                 msg_Err( p_obj, "cannot get tuner frequency (%m)" );
2324                 goto open_failed;
2325             }
2326             msg_Dbg( p_obj, "tuner %i (%s) frequency: %.1f %s",
2327                      i_index,
2328                      p_sys->p_tuners[i_index].name,
2329                      frequency.frequency * 62.5,
2330                      p_sys->p_tuners[i_index].capability &
2331                              V4L2_TUNER_CAP_LOW ?
2332                              "Hz" : "kHz" );
2333         }
2334     }
2335
2336     /* Probe for available chromas */
2337     if( p_sys->dev_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE )
2338     {
2339         struct v4l2_fmtdesc codec;
2340
2341         i_index = 0;
2342         memset( &codec, 0, sizeof(codec) );
2343         codec.index = i_index;
2344         codec.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2345
2346         while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FMT, &codec ) >= 0 )
2347         {
2348             i_index++;
2349             codec.index = i_index;
2350         }
2351
2352         p_sys->i_codec = i_index;
2353
2354         p_sys->p_codecs = calloc( 1, p_sys->i_codec * sizeof( struct v4l2_fmtdesc ) );
2355
2356         for( i_index = 0; i_index < p_sys->i_codec; i_index++ )
2357         {
2358             p_sys->p_codecs[i_index].index = i_index;
2359             p_sys->p_codecs[i_index].type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2360
2361             if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FMT, &p_sys->p_codecs[i_index] ) < 0 )
2362             {
2363                 msg_Err( p_obj, "cannot get codec description (%m)" );
2364                 goto open_failed;
2365             }
2366
2367             /* only print if vlc supports the format */
2368             char psz_fourcc_v4l2[5];
2369             memset( &psz_fourcc_v4l2, 0, sizeof( psz_fourcc_v4l2 ) );
2370             vlc_fourcc_to_char( p_sys->p_codecs[i_index].pixelformat,
2371                                 &psz_fourcc_v4l2 );
2372             bool b_codec_supported = false;
2373             for( int i = 0; v4l2chroma_to_fourcc[i].i_v4l2 != 0; i++ )
2374             {
2375                 if( v4l2chroma_to_fourcc[i].i_v4l2 == p_sys->p_codecs[i_index].pixelformat )
2376                 {
2377                     b_codec_supported = true;
2378
2379                     char psz_fourcc[5];
2380                     memset( &psz_fourcc, 0, sizeof( psz_fourcc ) );
2381                     vlc_fourcc_to_char( v4l2chroma_to_fourcc[i].i_fourcc,
2382                                         &psz_fourcc );
2383                     msg_Dbg( p_obj, "device supports chroma %4s [%s, %s]",
2384                                 psz_fourcc,
2385                                 p_sys->p_codecs[i_index].description,
2386                                 psz_fourcc_v4l2 );
2387
2388 #ifdef VIDIOC_ENUM_FRAMESIZES
2389                     /* This is new in Linux 2.6.19 */
2390                     /* List valid frame sizes for this format */
2391                     struct v4l2_frmsizeenum frmsize;
2392                     frmsize.index = 0;
2393                     frmsize.pixel_format = p_sys->p_codecs[i_index].pixelformat;
2394                     if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES, &frmsize ) < 0 )
2395                     {
2396                         /* Not all devices support this ioctl */
2397                         msg_Warn( p_obj, "Unable to query for frame sizes" );
2398                     }
2399                     else
2400                     {
2401                         switch( frmsize.type )
2402                         {
2403                             case V4L2_FRMSIZE_TYPE_DISCRETE:
2404                                 do
2405                                 {
2406                                     msg_Dbg( p_obj,
2407                 "    device supports size %dx%d",
2408                 frmsize.discrete.width, frmsize.discrete.height );
2409                                     frmsize.index++;
2410                                 } while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES, &frmsize ) >= 0 );
2411                                 break;
2412                             case V4L2_FRMSIZE_TYPE_STEPWISE:
2413                                 msg_Dbg( p_obj,
2414                 "    device supports sizes %dx%d to %dx%d using %dx%d increments",
2415                 frmsize.stepwise.min_width, frmsize.stepwise.min_height,
2416                 frmsize.stepwise.max_width, frmsize.stepwise.max_height,
2417                 frmsize.stepwise.step_width, frmsize.stepwise.step_height );
2418                                 break;
2419                             case V4L2_FRMSIZE_TYPE_CONTINUOUS:
2420                                 msg_Dbg( p_obj,
2421                 "    device supports all sizes %dx%d to %dx%d",
2422                 frmsize.stepwise.min_width, frmsize.stepwise.min_height,
2423                 frmsize.stepwise.max_width, frmsize.stepwise.max_height );
2424                                 break;
2425                         }
2426                     }
2427 #endif
2428                 }
2429             }
2430             if( !b_codec_supported )
2431             {
2432                     msg_Dbg( p_obj,
2433                          "device codec %4s (%s) not supported",
2434                          psz_fourcc_v4l2,
2435                          p_sys->p_codecs[i_index].description );
2436             }
2437         }
2438     }
2439
2440
2441     if( i_fd >= 0 ) v4l2_close( i_fd );
2442     return true;
2443
2444 open_failed:
2445
2446     if( i_fd >= 0 ) v4l2_close( i_fd );
2447     return false;
2448
2449 }
2450
2451 static void name2var( unsigned char *name )
2452 {
2453     for( ; *name; name++ )
2454         *name = (*name == ' ') ? '_' : tolower( *name );
2455 }
2456
2457 /*****************************************************************************
2458  * Print a user-class v4l2 control's details, create the relevant variable,
2459  * change the value if needed.
2460  *****************************************************************************/
2461 static void ControlListPrint( vlc_object_t *p_obj, int i_fd,
2462                               struct v4l2_queryctrl queryctrl,
2463                               bool b_reset, bool b_demux )
2464 {
2465     struct v4l2_querymenu querymenu;
2466     unsigned int i_mid;
2467
2468     int i;
2469     int i_val;
2470
2471     char *psz_name;
2472     vlc_value_t val, val2;
2473
2474     if( queryctrl.flags & V4L2_CTRL_FLAG_GRABBED )
2475         msg_Dbg( p_obj, "    control is busy" );
2476     if( queryctrl.flags & V4L2_CTRL_FLAG_READ_ONLY )
2477         msg_Dbg( p_obj, "    control is read-only" );
2478
2479     for( i = 0; controls[i].psz_name != NULL; i++ )
2480         if( controls[i].i_cid == queryctrl.id ) break;
2481
2482     if( controls[i].psz_name )
2483     {
2484         psz_name = strdup( controls[i].psz_name );
2485         char psz_cfg_name[40];
2486         sprintf( psz_cfg_name, CFG_PREFIX "%s", psz_name );
2487         i_val = var_CreateGetInteger( p_obj, psz_cfg_name );
2488         var_Destroy( p_obj, psz_cfg_name );
2489     }
2490     else
2491     {
2492         psz_name = strdup( (const char *)queryctrl.name );
2493         name2var( (unsigned char *)psz_name );
2494         i_val = -1;
2495     }
2496
2497     switch( queryctrl.type )
2498     {
2499         case V4L2_CTRL_TYPE_INTEGER:
2500             msg_Dbg( p_obj, "    integer control" );
2501             msg_Dbg( p_obj,
2502                      "    valid values: %d to %d by steps of %d",
2503                      queryctrl.minimum, queryctrl.maximum,
2504                      queryctrl.step );
2505
2506             var_Create( p_obj, psz_name,
2507                         VLC_VAR_INTEGER | VLC_VAR_HASMIN | VLC_VAR_HASMAX
2508                       | VLC_VAR_HASSTEP | VLC_VAR_ISCOMMAND );
2509             val.i_int = queryctrl.minimum;
2510             var_Change( p_obj, psz_name, VLC_VAR_SETMIN, &val, NULL );
2511             val.i_int = queryctrl.maximum;
2512             var_Change( p_obj, psz_name, VLC_VAR_SETMAX, &val, NULL );
2513             val.i_int = queryctrl.step;
2514             var_Change( p_obj, psz_name, VLC_VAR_SETSTEP, &val, NULL );
2515             break;
2516         case V4L2_CTRL_TYPE_BOOLEAN:
2517             msg_Dbg( p_obj, "    boolean control" );
2518             var_Create( p_obj, psz_name,
2519                         VLC_VAR_BOOL | VLC_VAR_ISCOMMAND );
2520             break;
2521         case V4L2_CTRL_TYPE_MENU:
2522             msg_Dbg( p_obj, "    menu control" );
2523             var_Create( p_obj, psz_name,
2524                         VLC_VAR_INTEGER | VLC_VAR_HASCHOICE
2525                       | VLC_VAR_ISCOMMAND );
2526             memset( &querymenu, 0, sizeof( querymenu ) );
2527             for( i_mid = queryctrl.minimum;
2528                  i_mid <= (unsigned)queryctrl.maximum;
2529                  i_mid++ )
2530             {
2531                 querymenu.index = i_mid;
2532                 querymenu.id = queryctrl.id;
2533                 if( v4l2_ioctl( i_fd, VIDIOC_QUERYMENU, &querymenu ) >= 0 )
2534                 {
2535                     msg_Dbg( p_obj, "        %d: %s",
2536                              querymenu.index, querymenu.name );
2537                     val.i_int = querymenu.index;
2538                     val2.psz_string = (char *)querymenu.name;
2539                     var_Change( p_obj, psz_name,
2540                                 VLC_VAR_ADDCHOICE, &val, &val2 );
2541                 }
2542             }
2543             break;
2544         case V4L2_CTRL_TYPE_BUTTON:
2545             msg_Dbg( p_obj, "    button control" );
2546             var_Create( p_obj, psz_name,
2547                         VLC_VAR_VOID | VLC_VAR_ISCOMMAND );
2548             break;
2549         case V4L2_CTRL_TYPE_CTRL_CLASS:
2550             msg_Dbg( p_obj, "    control class" );
2551             var_Create( p_obj, psz_name, VLC_VAR_VOID );
2552             break;
2553         default:
2554             msg_Dbg( p_obj, "    unknown control type (FIXME)" );
2555             /* FIXME */
2556             break;
2557     }
2558
2559     switch( queryctrl.type )
2560     {
2561         case V4L2_CTRL_TYPE_INTEGER:
2562         case V4L2_CTRL_TYPE_BOOLEAN:
2563         case V4L2_CTRL_TYPE_MENU:
2564             {
2565                 struct v4l2_control control;
2566                 msg_Dbg( p_obj, "    default value: %d",
2567                          queryctrl.default_value );
2568                 memset( &control, 0, sizeof( control ) );
2569                 control.id = queryctrl.id;
2570                 if( v4l2_ioctl( i_fd, VIDIOC_G_CTRL, &control ) >= 0 )
2571                 {
2572                     msg_Dbg( p_obj, "    current value: %d", control.value );
2573                 }
2574                 if( i_val == -1 )
2575                 {
2576                     i_val = control.value;
2577                     if( b_reset && queryctrl.default_value != control.value )
2578                     {
2579                         msg_Dbg( p_obj, "    reset value to default" );
2580                         Control( p_obj, i_fd, psz_name,
2581                                       queryctrl.id, queryctrl.default_value );
2582                     }
2583                 }
2584                 else
2585                 {
2586                     Control( p_obj, i_fd, psz_name,
2587                                   queryctrl.id, i_val );
2588                 }
2589             }
2590             break;
2591         default:
2592             break;
2593     }
2594
2595     val.psz_string = (char *)queryctrl.name;
2596     var_Change( p_obj, psz_name, VLC_VAR_SETTEXT, &val, NULL );
2597     val.i_int = queryctrl.id;
2598     val2.psz_string = (char *)psz_name;
2599     var_Change( p_obj, "allcontrols", VLC_VAR_ADDCHOICE, &val, &val2 );
2600     /* bad things happen changing MPEG mid-stream
2601      * so don't add to Ext Settings GUI */
2602     if( V4L2_CTRL_ID2CLASS( queryctrl.id ) != V4L2_CTRL_CLASS_MPEG )
2603         var_Change( p_obj, "controls", VLC_VAR_ADDCHOICE, &val, &val2 );
2604
2605     switch( var_Type( p_obj, psz_name ) & VLC_VAR_TYPE )
2606     {
2607         case VLC_VAR_BOOL:
2608             var_SetBool( p_obj, psz_name, i_val );
2609             break;
2610         case VLC_VAR_INTEGER:
2611             var_SetInteger( p_obj, psz_name, i_val );
2612             break;
2613         case VLC_VAR_VOID:
2614             break;
2615         default:
2616             msg_Warn( p_obj, "FIXME: %s %s %d", __FILE__, __func__,
2617                       __LINE__ );
2618             break;
2619     }
2620
2621     if( b_demux )
2622         var_AddCallback( p_obj, psz_name,
2623                         DemuxControlCallback, (void*)(intptr_t)queryctrl.id );
2624     else
2625         var_AddCallback( p_obj, psz_name,
2626                         AccessControlCallback, (void*)(intptr_t)queryctrl.id );
2627
2628     free( psz_name );
2629 }
2630
2631 /*****************************************************************************
2632  * List all user-class v4l2 controls, set them to the user specified
2633  * value and create the relevant variables to enable runtime changes
2634  *****************************************************************************/
2635 static int ControlList( vlc_object_t *p_obj, int i_fd,
2636                         bool b_reset, bool b_demux )
2637 {
2638     struct v4l2_queryctrl queryctrl;
2639     int i_cid;
2640
2641     memset( &queryctrl, 0, sizeof( queryctrl ) );
2642
2643     /* A list of available controls (aka the variable name) will be
2644      * stored as choices in the "allcontrols" variable. We'll thus be able
2645      * to use those to create an appropriate interface
2646      * A list of available controls that can be changed mid-stream will
2647      * be stored in the "controls" variable */
2648     var_Create( p_obj, "controls", VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
2649     var_Create( p_obj, "allcontrols", VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
2650
2651     var_Create( p_obj, "controls-update", VLC_VAR_VOID | VLC_VAR_ISCOMMAND );
2652
2653     /* Add a control to reset all controls to their default values */
2654     vlc_value_t val, val2;
2655     var_Create( p_obj, "controls-reset", VLC_VAR_VOID | VLC_VAR_ISCOMMAND );
2656     val.psz_string = _( "Reset controls to default" );
2657     var_Change( p_obj, "controls-reset", VLC_VAR_SETTEXT, &val, NULL );
2658     val.i_int = -1;
2659     val2.psz_string = (char *)"controls-reset";
2660     var_Change( p_obj, "controls", VLC_VAR_ADDCHOICE, &val, &val2 );
2661     if (b_demux)
2662         var_AddCallback( p_obj, "controls-reset", DemuxControlResetCallback, NULL );
2663     else
2664         var_AddCallback( p_obj, "controls-reset", AccessControlResetCallback, NULL );
2665
2666     queryctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
2667     if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2668     {
2669         msg_Dbg( p_obj, "Extended control API supported by v4l2 driver" );
2670
2671         /* List extended controls */
2672         queryctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
2673         while( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2674         {
2675             if( queryctrl.type == V4L2_CTRL_TYPE_CTRL_CLASS )
2676             {
2677                 msg_Dbg( p_obj, "%s", queryctrl.name );
2678                 queryctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
2679                 continue;
2680             }
2681             switch( V4L2_CTRL_ID2CLASS( queryctrl.id ) )
2682             {
2683                 case V4L2_CTRL_CLASS_USER:
2684                     msg_Dbg( p_obj, "Available control: %s (%x)",
2685                              queryctrl.name, queryctrl.id );
2686                     break;
2687                 case V4L2_CTRL_CLASS_MPEG:
2688                     name2var( queryctrl.name );
2689                     msg_Dbg( p_obj, "Available MPEG control: %s (%x)",
2690                              queryctrl.name, queryctrl.id );
2691                     break;
2692                 default:
2693                     msg_Dbg( p_obj, "Available private control: %s (%x)",
2694                              queryctrl.name, queryctrl.id );
2695                     break;
2696             }
2697             ControlListPrint( p_obj, i_fd, queryctrl, b_reset, b_demux );
2698             queryctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
2699         }
2700     }
2701     else
2702     {
2703         msg_Dbg( p_obj, "Extended control API not supported by v4l2 driver" );
2704
2705         /* List public controls */
2706         for( i_cid = V4L2_CID_BASE;
2707              i_cid < V4L2_CID_LASTP1;
2708              i_cid ++ )
2709         {
2710             queryctrl.id = i_cid;
2711             if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2712             {
2713                 if( queryctrl.flags & V4L2_CTRL_FLAG_DISABLED )
2714                     continue;
2715                 msg_Dbg( p_obj, "Available control: %s (%x)",
2716                          queryctrl.name, queryctrl.id );
2717                 ControlListPrint( p_obj, i_fd, queryctrl, b_reset, b_demux );
2718             }
2719         }
2720
2721         /* List private controls */
2722         for( i_cid = V4L2_CID_PRIVATE_BASE;
2723              ;
2724              i_cid ++ )
2725         {
2726             queryctrl.id = i_cid;
2727             if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2728             {
2729                 if( queryctrl.flags & V4L2_CTRL_FLAG_DISABLED )
2730                     continue;
2731                 msg_Dbg( p_obj, "Available private control: %s (%x)",
2732                          queryctrl.name, queryctrl.id );
2733                 ControlListPrint( p_obj, i_fd, queryctrl, b_reset, b_demux );
2734             }
2735             else
2736                 break;
2737         }
2738     }
2739
2740     return VLC_SUCCESS;
2741 }
2742
2743 static void SetAvailControlsByString( vlc_object_t *p_obj, demux_sys_t *p_sys,
2744                                       int i_fd )
2745 {
2746     char *psz_parser = p_sys->psz_set_ctrls;
2747     vlc_value_t val, text, name;
2748
2749     if( psz_parser == NULL )
2750         return;
2751
2752     if( *psz_parser == '{' )
2753         psz_parser++;
2754
2755     int i_ret = var_Change( p_obj, "allcontrols", VLC_VAR_GETCHOICES,
2756                             &val, &text );
2757     if( i_ret < 0 )
2758     {
2759         msg_Err( p_obj, "Oops, can't find 'allcontrols' variable." );
2760         return;
2761     }
2762
2763     while( *psz_parser && *psz_parser != '}' )
2764     {
2765         char *psz_delim, *psz_assign;
2766
2767         while( *psz_parser == ',' || *psz_parser == ' ' )
2768             psz_parser++;
2769
2770         psz_delim = strchr( psz_parser, ',' );
2771         if( psz_delim == NULL )
2772             psz_delim = strchr( psz_parser, '}' );
2773         if( psz_delim == NULL )
2774             psz_delim = psz_parser + strlen( psz_parser );
2775
2776         psz_assign = memchr( psz_parser, '=', psz_delim - psz_parser );
2777         if( psz_assign == NULL )
2778         {
2779             char *psz_name = strndup( psz_parser, psz_delim - psz_parser );
2780             msg_Err( p_obj, "%s missing '='", psz_name );
2781             free( psz_name );
2782             psz_parser = psz_delim + 1;
2783             continue;
2784         }
2785
2786         for( int i = 0;
2787              i < val.p_list->i_count ;//&& psz_parser < psz_assign;
2788              i++ )
2789         {
2790             const char *psz_var = text.p_list->p_values[i].psz_string;
2791             int i_cid = val.p_list->p_values[i].i_int;
2792             var_Change( p_obj, psz_var, VLC_VAR_GETTEXT, &name, NULL );
2793             const char *psz_name = name.psz_string;
2794
2795             int i_availstrlen = strlen( psz_name );
2796             int i_parsestrlen = psz_assign - psz_parser;
2797             int i_maxstrlen = __MAX( i_availstrlen, i_parsestrlen);
2798
2799             if( !strncasecmp( psz_name, psz_parser, i_maxstrlen ) )
2800             {
2801                 Control( p_obj, i_fd, psz_name, i_cid,
2802                          strtol( ++psz_assign, &psz_parser, 0) );
2803             }
2804         }
2805
2806         if( psz_parser < psz_assign )
2807         {
2808             char *psz_name = strndup( psz_parser, psz_assign - psz_parser );
2809             msg_Err( p_obj, "Control %s not available", psz_name );
2810             free( psz_name );
2811             psz_parser = ( *psz_delim ) ? ( psz_delim + 1 ) : psz_delim;
2812         }
2813     }
2814 }
2815
2816 /*****************************************************************************
2817  * Reset all user-class v4l2 controls to their default value
2818  *****************************************************************************/
2819 static int ControlReset( vlc_object_t *p_obj, int i_fd )
2820 {
2821     struct v4l2_queryctrl queryctrl;
2822     int i_cid;
2823     memset( &queryctrl, 0, sizeof( queryctrl ) );
2824
2825     queryctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
2826     if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2827     {
2828         /* Extended control API supported */
2829         queryctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
2830         while( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2831         {
2832             if( queryctrl.type == V4L2_CTRL_TYPE_CTRL_CLASS
2833              || V4L2_CTRL_ID2CLASS( queryctrl.id ) == V4L2_CTRL_CLASS_MPEG )
2834             {
2835                 queryctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
2836                 continue;
2837             }
2838             struct v4l2_control control;
2839             memset( &control, 0, sizeof( control ) );
2840             control.id = queryctrl.id;
2841             if( v4l2_ioctl( i_fd, VIDIOC_G_CTRL, &control ) >= 0
2842              && queryctrl.default_value != control.value )
2843             {
2844                 int i;
2845                 for( i = 0; controls[i].psz_name != NULL; i++ )
2846                     if( controls[i].i_cid == queryctrl.id ) break;
2847                 name2var( queryctrl.name );
2848                 Control( p_obj, i_fd,
2849                          controls[i].psz_name ? : (const char *)queryctrl.name,
2850                          queryctrl.id, queryctrl.default_value );
2851             }
2852             queryctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
2853         }
2854     }
2855     else
2856     {
2857
2858         /* public controls */
2859         for( i_cid = V4L2_CID_BASE;
2860              i_cid < V4L2_CID_LASTP1;
2861              i_cid ++ )
2862         {
2863             queryctrl.id = i_cid;
2864             if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2865             {
2866                 struct v4l2_control control;
2867                 if( queryctrl.flags & V4L2_CTRL_FLAG_DISABLED )
2868                     continue;
2869                 memset( &control, 0, sizeof( control ) );
2870                 control.id = queryctrl.id;
2871                 if( v4l2_ioctl( i_fd, VIDIOC_G_CTRL, &control ) >= 0
2872                  && queryctrl.default_value != control.value )
2873                 {
2874                     int i;
2875                     for( i = 0; controls[i].psz_name != NULL; i++ )
2876                         if( controls[i].i_cid == queryctrl.id ) break;
2877                     name2var( queryctrl.name );
2878                     Control( p_obj, i_fd,
2879                              controls[i].psz_name ? : (const char *)queryctrl.name,
2880                              queryctrl.id, queryctrl.default_value );
2881                 }
2882             }
2883         }
2884
2885         /* private controls */
2886         for( i_cid = V4L2_CID_PRIVATE_BASE;
2887              ;
2888              i_cid ++ )
2889         {
2890             queryctrl.id = i_cid;
2891             if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2892             {
2893                 struct v4l2_control control;
2894                 if( queryctrl.flags & V4L2_CTRL_FLAG_DISABLED )
2895                     continue;
2896                 memset( &control, 0, sizeof( control ) );
2897                 control.id = queryctrl.id;
2898                 if( v4l2_ioctl( i_fd, VIDIOC_G_CTRL, &control ) >= 0
2899                  && queryctrl.default_value != control.value )
2900                 {
2901                     name2var( queryctrl.name );
2902                     Control( p_obj, i_fd, (const char *)queryctrl.name,
2903                              queryctrl.id, queryctrl.default_value );
2904                 }
2905             }
2906             else
2907                 break;
2908         }
2909     }
2910     return VLC_SUCCESS;
2911 }
2912
2913 /*****************************************************************************
2914  * Issue user-class v4l2 controls
2915  *****************************************************************************/
2916 static int Control( vlc_object_t *p_obj, int i_fd,
2917                     const char *psz_name, int i_cid, int i_value )
2918 {
2919     struct v4l2_queryctrl queryctrl;
2920     struct v4l2_control control;
2921     struct v4l2_ext_control ext_control;
2922     struct v4l2_ext_controls ext_controls;
2923
2924     if( i_value == -1 )
2925         return VLC_SUCCESS;
2926
2927     memset( &queryctrl, 0, sizeof( queryctrl ) );
2928
2929     queryctrl.id = i_cid;
2930
2931     if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) < 0
2932         || queryctrl.flags & V4L2_CTRL_FLAG_DISABLED )
2933     {
2934         msg_Dbg( p_obj, "%s (%x) control is not supported.", psz_name, i_cid );
2935         return VLC_EGENERIC;
2936     }
2937
2938     memset( &control, 0, sizeof( control ) );
2939     memset( &ext_control, 0, sizeof( ext_control ) );
2940     memset( &ext_controls, 0, sizeof( ext_controls ) );
2941     control.id = i_cid;
2942     ext_control.id = i_cid;
2943     ext_controls.ctrl_class = V4L2_CTRL_ID2CLASS( i_cid );
2944     ext_controls.count = 1;
2945     ext_controls.controls = &ext_control;
2946
2947     int i_ret = -1;
2948
2949     if( i_value >= 0 )
2950     {
2951         ext_control.value = i_value;
2952         if( v4l2_ioctl( i_fd, VIDIOC_S_EXT_CTRLS, &ext_controls ) < 0 )
2953         {
2954             control.value = i_value;
2955             if( v4l2_ioctl( i_fd, VIDIOC_S_CTRL, &control ) < 0 )
2956             {
2957                 msg_Err( p_obj, "unable to set %s (%x) to %d (%m)",
2958                          psz_name, i_cid, i_value );
2959                 return VLC_EGENERIC;
2960             }
2961             i_ret = v4l2_ioctl( i_fd, VIDIOC_G_CTRL, &control );
2962         }
2963         else
2964         {
2965             i_ret = v4l2_ioctl( i_fd, VIDIOC_G_EXT_CTRLS, &ext_controls );
2966             control.value = ext_control.value;
2967         }
2968     }
2969
2970     if( i_ret >= 0 )
2971     {
2972         vlc_value_t val;
2973         msg_Dbg( p_obj, "video %s: %d", psz_name, control.value );
2974         switch( var_Type( p_obj, psz_name ) & VLC_VAR_TYPE )
2975         {
2976             case VLC_VAR_BOOL:
2977                 val.b_bool = control.value;
2978                 var_Change( p_obj, psz_name, VLC_VAR_SETVALUE, &val, NULL );
2979                 var_SetVoid( p_obj, "controls-update" );
2980                 break;
2981             case VLC_VAR_INTEGER:
2982                 val.i_int = control.value;
2983                 var_Change( p_obj, psz_name, VLC_VAR_SETVALUE, &val, NULL );
2984                 var_SetVoid( p_obj, "controls-update" );
2985                 break;
2986         }
2987     }
2988     return VLC_SUCCESS;
2989 }
2990
2991 /*****************************************************************************
2992  * On the fly change settings callback
2993  *****************************************************************************/
2994 static int DemuxControlCallback( vlc_object_t *p_this,
2995     const char *psz_var, vlc_value_t oldval, vlc_value_t newval,
2996     void *p_data )
2997 {
2998     (void)oldval;
2999     demux_t *p_demux = (demux_t*)p_this;
3000     demux_sys_t *p_sys = p_demux->p_sys;
3001     int i_cid = (long int)p_data;
3002
3003     int i_fd = p_sys->i_fd;
3004
3005     if( i_fd < 0 )
3006         return VLC_EGENERIC;
3007
3008     Control( p_this, i_fd, psz_var, i_cid, newval.i_int );
3009
3010     return VLC_EGENERIC;
3011 }
3012
3013 static int DemuxControlResetCallback( vlc_object_t *p_this,
3014     const char *psz_var, vlc_value_t oldval, vlc_value_t newval, void *p_data )
3015 {
3016     (void)psz_var;    (void)oldval;    (void)newval;    (void)p_data;
3017     demux_t *p_demux = (demux_t*)p_this;
3018     demux_sys_t *p_sys = p_demux->p_sys;
3019
3020     int i_fd = p_sys->i_fd;
3021
3022     if( i_fd < 0 )
3023         return VLC_EGENERIC;
3024
3025     ControlReset( p_this, i_fd );
3026
3027     return VLC_EGENERIC;
3028 }
3029
3030 static int AccessControlCallback( vlc_object_t *p_this,
3031     const char *psz_var, vlc_value_t oldval, vlc_value_t newval,
3032     void *p_data )
3033 {
3034     (void)oldval;
3035     access_t *p_access = (access_t *)p_this;
3036     demux_sys_t *p_sys = (demux_sys_t *) p_access->p_sys;
3037     int i_cid = (long int)p_data;
3038
3039     int i_fd = p_sys->i_fd;
3040
3041     if( i_fd < 0 )
3042         return VLC_EGENERIC;
3043
3044     Control( p_this, i_fd, psz_var, i_cid, newval.i_int );
3045
3046     return VLC_EGENERIC;
3047 }
3048
3049 static int AccessControlResetCallback( vlc_object_t *p_this,
3050     const char *psz_var, vlc_value_t oldval, vlc_value_t newval, void *p_data )
3051 {
3052     (void)psz_var;     (void)oldval;     (void)newval;     (void)p_data;
3053     access_t *p_access = (access_t *)p_this;
3054     demux_sys_t *p_sys = (demux_sys_t *) p_access->p_sys;
3055
3056     int i_fd = p_sys->i_fd;
3057
3058     if( i_fd < 0 )
3059         return VLC_EGENERIC;
3060
3061     ControlReset( p_this, i_fd );
3062
3063     return VLC_EGENERIC;
3064 }