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( strcmp( p_demux->psz_access, "v4l2" ) )
 569         return VLC_EGENERIC;
 570
 571     /* Set up p_demux */
 572     p_demux->pf_control = DemuxControl;
 573     p_demux->pf_demux = Demux;
 574     p_demux->info.i_update = 0;
 575     p_demux->info.i_title = 0;
 576     p_demux->info.i_seekpoint = 0;
 577
 578     p_demux->p_sys = p_sys = calloc( 1, sizeof( demux_sys_t ) );
 579     if( p_sys == NULL ) return VLC_ENOMEM;
 580
 581     GetV4L2Params(p_sys, (vlc_object_t *) p_demux);
 582
 583     ParseMRL( p_sys, p_demux->psz_path, (vlc_object_t *) p_demux );
 584
 585     if( FindMainDevice( p_this, p_sys, true ) != VLC_SUCCESS)
 586     {
 587         DemuxClose( p_this );
 588         return VLC_EGENERIC;
 589     }
 590
 591     return VLC_SUCCESS;
 592 }
 593
 594 /*****************************************************************************
 595  * GetV4L2Params: fill in p_sys parameters (shared by DemuxOpen and AccessOpen)
 596  *****************************************************************************/
 597 static void GetV4L2Params( demux_sys_t *p_sys, vlc_object_t *p_obj )
 598 {
 599     p_sys->i_video_pts = -1;
 600
 601     p_sys->i_selected_standard_id =
 602         i_standards_list[var_CreateGetInteger( p_obj, "v4l2-standard" )];
 603
 604     p_sys->i_selected_input = var_CreateGetInteger( p_obj, "v4l2-input" );
 605     p_sys->i_selected_audio_input =
 606         var_CreateGetInteger( p_obj, "v4l2-audio-input" );
 607
 608     p_sys->io = var_CreateGetInteger( p_obj, "v4l2-io" );
 609
 610     p_sys->i_width = var_CreateGetInteger( p_obj, "v4l2-width" );
 611     p_sys->i_height = var_CreateGetInteger( p_obj, "v4l2-height" );
 612
 613     var_Create( p_obj, "v4l2-controls-reset", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
 614
 615     p_sys->f_fps = var_CreateGetFloat( p_obj, "v4l2-fps" );
 616     p_sys->psz_requested_chroma = var_CreateGetString( p_obj, "v4l2-chroma" );
 617
 618     p_sys->i_cache = var_CreateGetInteger( p_obj, "v4l2-caching" );
 619
 620     p_sys->i_cur_tuner = var_CreateGetInteger( p_obj, "v4l2-tuner" );
 621     p_sys->i_frequency = var_CreateGetInteger( p_obj, "v4l2-tuner-frequency" );
 622     p_sys->i_audio_mode = var_CreateGetInteger( p_obj, "v4l2-tuner-audio-mode" );
 623
 624     p_sys->psz_set_ctrls = var_CreateGetString( p_obj, "v4l2-set-ctrls" );
 625
 626     p_sys->psz_device = NULL;
 627     p_sys->i_fd = -1;
 628
 629     p_sys->p_es = NULL;
 630 }
 631
 632 /*****************************************************************************
 633  * ParseMRL: parse the options contained in the MRL
 634  *****************************************************************************/
 635 static void ParseMRL( demux_sys_t *p_sys, char *psz_path, vlc_object_t *p_obj )
 636 {
 637     char *psz_dup = strdup( psz_path );
 638     char *psz_parser = psz_dup;
 639
 640     while( *psz_parser && *psz_parser != ':' )
 641     {
 642         psz_parser++;
 643     }
 644
 645     if( *psz_parser == ':' )
 646     {
 647         /* read options */
 648         for( ;; )
 649         {
 650             *psz_parser++ = '\0';
 651
 652             if( !strncmp( psz_parser, "standard=", strlen( "standard=" ) ) )
 653             {
 654                 psz_parser += strlen( "standard=" );
 655                 if( !strncmp( psz_parser, "pal", strlen( "pal" ) ) )
 656                 {
 657                     p_sys->i_selected_standard_id = V4L2_STD_PAL;
 658                     psz_parser += strlen( "pal" );
 659                 }
 660                 else if( !strncmp( psz_parser, "ntsc", strlen( "ntsc" ) ) )
 661                 {
 662                     p_sys->i_selected_standard_id = V4L2_STD_NTSC;
 663                     psz_parser += strlen( "ntsc" );
 664                 }
 665                 else if( !strncmp( psz_parser, "secam", strlen( "secam" ) ) )
 666                 {
 667                     p_sys->i_selected_standard_id = V4L2_STD_SECAM;
 668                     psz_parser += strlen( "secam" );
 669                 }
 670                 else if( !strncmp( psz_parser, "default", strlen( "default" ) ) )
 671                 {
 672                     p_sys->i_selected_standard_id = V4L2_STD_UNKNOWN;
 673                     psz_parser += strlen( "default" );
 674                 }
 675                 else
 676                 {
 677                     p_sys->i_selected_standard_id = i_standards_list[strtol( psz_parser, &psz_parser, 0 )];
 678                 }
 679             }
 680             else if( !strncmp( psz_parser, "chroma=", strlen( "chroma=" ) ) )
 681             {
 682                 int  i_len;
 683
 684                 psz_parser += strlen( "chroma=" );
 685                 if( strchr( psz_parser, ':' ) )
 686                 {
 687                     i_len = strchr( psz_parser, ':' ) - psz_parser;
 688                 }
 689                 else
 690                 {
 691                     i_len = strlen( psz_parser );
 692                 }
 693
 694                 free( p_sys->psz_requested_chroma );
 695                 p_sys->psz_requested_chroma = strndup( psz_parser, i_len );
 696
 697                 psz_parser += i_len;
 698             }
 699             else if( !strncmp( psz_parser, "input=", strlen( "input=" ) ) )
 700             {
 701                 p_sys->i_selected_input = strtol( psz_parser + strlen( "input=" ),
 702                                        &psz_parser, 0 );
 703             }
 704             else if( !strncmp( psz_parser, "audio-input=", strlen( "audio-input=" ) ) )
 705             {
 706                 p_sys->i_selected_audio_input = strtol( psz_parser + strlen( "audio-input=" ),
 707                                        &psz_parser, 0 );
 708             }
 709             else if( !strncmp( psz_parser, "fps=", strlen( "fps=" ) ) )
 710             {
 711                 p_sys->f_fps = strtof( psz_parser + strlen( "fps=" ),
 712                                        &psz_parser );
 713             }
 714             else if( !strncmp( psz_parser, "io=", strlen( "io=" ) ) )
 715             {
 716                 psz_parser += strlen( "io=" );
 717                 if( !strncmp( psz_parser, "read", strlen( "read" ) ) )
 718                 {
 719                     p_sys->io = IO_METHOD_READ;
 720                     psz_parser += strlen( "read" );
 721                 }
 722                 else if( !strncmp( psz_parser, "mmap", strlen( "mmap" ) ) )
 723                 {
 724                     p_sys->io = IO_METHOD_MMAP;
 725                     psz_parser += strlen( "mmap" );
 726                 }
 727                 else if( !strncmp( psz_parser, "userptr", strlen( "userptr" ) ) )
 728                 {
 729                     p_sys->io = IO_METHOD_USERPTR;
 730                     psz_parser += strlen( "userptr" );
 731                 }
 732                 else
 733                 {
 734                     p_sys->io = strtol( psz_parser, &psz_parser, 0 );
 735                 }
 736             }
 737             else if( !strncmp( psz_parser, "width=",
 738                                strlen( "width=" ) ) )
 739             {
 740                 p_sys->i_width =
 741                     strtol( psz_parser + strlen( "width=" ),
 742                             &psz_parser, 0 );
 743             }
 744             else if( !strncmp( psz_parser, "height=",
 745                                strlen( "height=" ) ) )
 746             {
 747                 p_sys->i_height =
 748                     strtol( psz_parser + strlen( "height=" ),
 749                             &psz_parser, 0 );
 750             }
 751             else if( !strncmp( psz_parser, "controls-reset",
 752                                strlen( "controls-reset" ) ) )
 753             {
 754                 var_SetBool( p_obj, "v4l2-controls-reset", true );
 755                 psz_parser += strlen( "controls-reset" );
 756             }
 757 #if 0
 758             else if( !strncmp( psz_parser, "brightness=",
 759                                strlen( "brightness=" ) ) )
 760             {
 761                 var_SetInteger( p_obj, "brightness",
 762                     strtol( psz_parser + strlen( "brightness=" ),
 763                             &psz_parser, 0 ) );
 764             }
 765             else if( !strncmp( psz_parser, "contrast=",
 766                                strlen( "contrast=" ) ) )
 767             {
 768                 var_SetInteger( p_obj, "contrast",
 769                     strtol( psz_parser + strlen( "contrast=" ),
 770                             &psz_parser, 0 ) );
 771             }
 772             else if( !strncmp( psz_parser, "saturation=",
 773                                strlen( "saturation=" ) ) )
 774             {
 775                 var_SetInteger( p_obj, "saturation",
 776                     strtol( psz_parser + strlen( "saturation=" ),
 777                             &psz_parser, 0 ) );
 778             }
 779             else if( !strncmp( psz_parser, "hue=",
 780                                strlen( "hue=" ) ) )
 781             {
 782                 var_SetInteger( p_obj, "hue",
 783                     strtol( psz_parser + strlen( "hue=" ),
 784                             &psz_parser, 0 ) );
 785             }
 786             else if( !strncmp( psz_parser, "gamma=",
 787                                strlen( "gamma=" ) ) )
 788             {
 789                 var_SetInteger( p_obj, "gamma",
 790                     strtol( psz_parser + strlen( "gamma=" ),
 791                             &psz_parser, 0 ) );
 792             }
 793 #endif
 794             else if( !strncmp( psz_parser, "caching=", strlen( "caching=" ) ) )
 795             {
 796                 p_sys->i_cache = strtol( psz_parser + strlen( "caching=" ),
 797                                          &psz_parser, 0 );
 798             }
 799             else if( !strncmp( psz_parser, "tuner=", strlen( "tuner=" ) ) )
 800             {
 801                 p_sys->i_cur_tuner = strtol( psz_parser + strlen( "tuner=" ),
 802                                          &psz_parser, 0 );
 803             }
 804             else if( !strncmp( psz_parser, "tuner-frequency=", strlen( "tuner-frequency=" ) ) )
 805             {
 806                 p_sys->i_frequency = strtol( psz_parser
 807                                           + strlen( "tuner-frequency=" ),
 808                                           &psz_parser, 0 );
 809             }
 810             else if( !strncmp( psz_parser, "tuner-audio-mode=", strlen( "tuner-audio-mode=" ) ) )
 811             {
 812                 p_sys->i_audio_mode = strtol( psz_parser
 813                                           + strlen( "tuner-audio-mode=" ),
 814                                           &psz_parser, 0 );
 815             }
 816             else if( !strncmp( psz_parser, "set-ctrls=", strlen( "set-ctrls=" )) )
 817             {
 818                 int  i_len;
 819
 820                 psz_parser += strlen( "set-ctrls=" );
 821                 if( strchr( psz_parser, ':' ) )
 822                 {
 823                     i_len = strchr( psz_parser, ':' ) - psz_parser;
 824                 }
 825                 else
 826                 {
 827                     i_len = strlen( psz_parser );
 828                 }
 829
 830                 p_sys->psz_set_ctrls = strndup( psz_parser, i_len );
 831
 832                 psz_parser += i_len;
 833             }
 834             else if( !strncmp( psz_parser, "adev=", strlen( "adev=" ) )
 835              || !strncmp( psz_parser, "samplerate=", strlen( "samplerate=" ) )
 836              || !strncmp( psz_parser, "audio-method", strlen( "audio-method" ) )
 837              || !strncmp( psz_parser, "stereo", strlen( "stereo" ) )
 838              || !strncmp( psz_parser, "mono", strlen( "mono" ) ) )
 839             {
 840                 if( strchr( psz_parser, ':' ) )
 841                 {
 842                     psz_parser = strchr( psz_parser, ':' );
 843                 }
 844                 else
 845                 {
 846                     psz_parser += strlen( psz_parser );
 847                 }
 848
 849                 msg_Err( p_obj, AUDIO_DEPRECATED_ERROR );
 850             }
 851             else
 852             {
 853                 char *psz_unk = strchr( psz_parser, ':' );
 854                 if (psz_unk)
 855                     psz_unk = strndup( psz_parser, psz_unk - psz_parser );
 856                 else
 857                     psz_unk = strdup( psz_parser);
 858                 msg_Warn( p_obj, "unknown option %s", psz_unk );
 859                 free (psz_unk);
 860             }
 861
 862             while( *psz_parser && *psz_parser != ':' )
 863             {
 864                 psz_parser++;
 865             }
 866
 867             if( *psz_parser == '\0' )
 868             {
 869                 break;
 870             }
 871         }
 872     }
 873
 874     /* Main device */
 875     if( *psz_dup )
 876         p_sys->psz_device = strdup( psz_dup );
 877     else
 878         p_sys->psz_device = strdup( V4L2_DEFAULT );
 879     free( psz_dup );
 880 }
 881
 882 /*****************************************************************************
 883  * Close: close device, free resources
 884  *****************************************************************************/
 885 static void AccessClose( vlc_object_t *p_this )
 886 {
 887     access_t    *p_access = (access_t *)p_this;
 888     demux_sys_t *p_sys   = (demux_sys_t *) p_access->p_sys;
 889
 890     CommonClose( p_this, p_sys );
 891 }
 892
 893 static void DemuxClose( vlc_object_t *p_this )
 894 {
 895     struct v4l2_buffer buf;
 896     enum v4l2_buf_type buf_type;
 897     unsigned int i;
 898
 899     demux_t     *p_demux = (demux_t *)p_this;
 900     demux_sys_t *p_sys   = p_demux->p_sys;
 901
 902     /* Stop video capture */
 903     if( p_sys->i_fd >= 0 )
 904     {
 905         switch( p_sys->io )
 906         {
 907         case IO_METHOD_READ:
 908             /* Nothing to do */
 909             break;
 910
 911         case IO_METHOD_MMAP:
 912         case IO_METHOD_USERPTR:
 913             /* Some drivers 'hang' internally if this is not done before streamoff */
 914             for( unsigned int i = 0; i < p_sys->i_nbuffers; i++ )
 915             {
 916                 memset( &buf, 0, sizeof(buf) );
 917                 buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 918                 buf.memory = ( p_sys->io == IO_METHOD_USERPTR ) ?
 919                     V4L2_MEMORY_USERPTR : V4L2_MEMORY_MMAP;
 920                 v4l2_ioctl( p_sys->i_fd, VIDIOC_DQBUF, &buf ); /* ignore result */
 921             }
 922
 923             buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 924             if( v4l2_ioctl( p_sys->i_fd, VIDIOC_STREAMOFF, &buf_type ) < 0 ) {
 925                 msg_Err( p_this, "VIDIOC_STREAMOFF failed" );
 926             }
 927
 928             break;
 929         }
 930     }
 931
 932     /* Free Video Buffers */
 933     if( p_sys->p_buffers ) {
 934         switch( p_sys->io )
 935         {
 936         case IO_METHOD_READ:
 937             free( p_sys->p_buffers[0].start );
 938             break;
 939
 940         case IO_METHOD_MMAP:
 941             for( i = 0; i < p_sys->i_nbuffers; ++i )
 942             {
 943                 if( v4l2_munmap( p_sys->p_buffers[i].start, p_sys->p_buffers[i].length ) )
 944                 {
 945                     msg_Err( p_this, "munmap failed" );
 946                 }
 947             }
 948             break;
 949
 950         case IO_METHOD_USERPTR:
 951             for( i = 0; i < p_sys->i_nbuffers; ++i )
 952             {
 953                free( p_sys->p_buffers[i].start );
 954             }
 955             break;
 956         }
 957         free( p_sys->p_buffers );
 958     }
 959
 960     CommonClose( p_this, p_sys );
 961 }
 962
 963 static void CommonClose( vlc_object_t *p_this, demux_sys_t *p_sys )
 964 {
 965     (void)p_this;
 966     /* Close */
 967     if( p_sys->i_fd >= 0 ) v4l2_close( p_sys->i_fd );
 968     free( p_sys->psz_device );
 969     free( p_sys->p_standards );
 970     free( p_sys->p_inputs );
 971     free( p_sys->p_tuners );
 972     free( p_sys->p_codecs );
 973     free( p_sys->psz_requested_chroma );
 974     free( p_sys->psz_set_ctrls );
 975
 976     free( p_sys );
 977 }
 978
 979 /*****************************************************************************
 980  * AccessOpen: opens v4l2 device, access callback
 981  *****************************************************************************
 982  *
 983  * url: <video device>::::
 984  *
 985  *****************************************************************************/
 986 static int AccessOpen( vlc_object_t * p_this )
 987 {
 988     access_t *p_access = (access_t*) p_this;
 989     demux_sys_t * p_sys;
 990
 991     /* Only when selected */
 992     if( *p_access->psz_access == '\0' ) return VLC_EGENERIC;
 993
 994     access_InitFields( p_access );
 995     ACCESS_SET_CALLBACKS( AccessRead, NULL, AccessControl, NULL );
 996     p_sys = calloc( 1, sizeof( demux_sys_t ));
 997     if( !p_sys ) return VLC_ENOMEM;
 998     p_access->p_sys = (access_sys_t*)p_sys;
 999
1000     GetV4L2Params( p_sys, (vlc_object_t *) p_access );
1001
1002     ParseMRL( p_sys, p_access->psz_path, (vlc_object_t *) p_access );
1003
1004     if( FindMainDevice( p_this, p_sys, false ) != VLC_SUCCESS )
1005     {
1006         AccessClose( p_this );
1007         return VLC_EGENERIC;
1008     }
1009
1010     return VLC_SUCCESS;
1011 }
1012
1013 /*****************************************************************************
1014  * DemuxControl:
1015  *****************************************************************************/
1016 static int DemuxControl( demux_t *p_demux, int i_query, va_list args )
1017 {
1018     demux_sys_t *p_sys = p_demux->p_sys;
1019     bool *pb;
1020     int64_t    *pi64;
1021
1022     switch( i_query )
1023     {
1024         /* Special for access_demux */
1025         case DEMUX_CAN_PAUSE:
1026         case DEMUX_CAN_SEEK:
1027         case DEMUX_SET_PAUSE_STATE:
1028         case DEMUX_CAN_CONTROL_PACE:
1029             pb = (bool*)va_arg( args, bool * );
1030             *pb = false;
1031             return VLC_SUCCESS;
1032
1033         case DEMUX_GET_PTS_DELAY:
1034             pi64 = (int64_t*)va_arg( args, int64_t * );
1035             *pi64 = (int64_t)p_sys->i_cache * 1000;
1036             return VLC_SUCCESS;
1037
1038         case DEMUX_GET_TIME:
1039             pi64 = (int64_t*)va_arg( args, int64_t * );
1040             *pi64 = mdate();
1041             return VLC_SUCCESS;
1042
1043         /* TODO implement others */
1044         default:
1045             return VLC_EGENERIC;
1046     }
1047
1048     return VLC_EGENERIC;
1049 }
1050
1051 /*****************************************************************************
1052  * AccessControl: access callback
1053  *****************************************************************************/
1054 static int AccessControl( access_t *p_access, int i_query, va_list args )
1055 {
1056     bool    *pb_bool;
1057     int64_t *pi_64;
1058     demux_sys_t  *p_sys = (demux_sys_t *) p_access->p_sys;
1059
1060     switch( i_query )
1061     {
1062         /* */
1063         case ACCESS_CAN_SEEK:
1064         case ACCESS_CAN_FASTSEEK:
1065             pb_bool = (bool*)va_arg( args, bool* );
1066             *pb_bool = false;
1067             break;
1068         case ACCESS_CAN_PAUSE:
1069             pb_bool = (bool*)va_arg( args, bool* );
1070             *pb_bool = false;
1071             break;
1072         case ACCESS_CAN_CONTROL_PACE:
1073             pb_bool = (bool*)va_arg( args, bool* );
1074             *pb_bool = false;
1075             break;
1076
1077         /* */
1078         case ACCESS_GET_PTS_DELAY:
1079             pi_64 = (int64_t*)va_arg( args, int64_t * );
1080             *pi_64 = (int64_t) p_sys->i_cache * 1000;
1081             break;
1082
1083         /* */
1084         case ACCESS_SET_PAUSE_STATE:
1085             /* Nothing to do */
1086             break;
1087
1088         case ACCESS_GET_TITLE_INFO:
1089         case ACCESS_SET_TITLE:
1090         case ACCESS_SET_SEEKPOINT:
1091         case ACCESS_SET_PRIVATE_ID_STATE:
1092         case ACCESS_GET_CONTENT_TYPE:
1093         case ACCESS_GET_META:
1094             return VLC_EGENERIC;
1095
1096         default:
1097             msg_Warn( p_access, "Unimplemented query in control(%d).", i_query);
1098             return VLC_EGENERIC;
1099
1100     }
1101     return VLC_SUCCESS;
1102 }
1103
1104 /*****************************************************************************
1105  * AccessRead: access callback
1106  ******************************************************************************/
1107 static ssize_t AccessRead( access_t * p_access, uint8_t * p_buffer, size_t i_len )
1108 {
1109     demux_sys_t *p_sys = (demux_sys_t *) p_access->p_sys;
1110     struct pollfd ufd;
1111     int i_ret;
1112
1113     ufd.fd = p_sys->i_fd;
1114     ufd.events = POLLIN;
1115
1116     if( p_access->info.b_eof )
1117         return 0;
1118
1119     do
1120     {
1121         if( !vlc_object_alive (p_access) )
1122             return 0;
1123
1124         ufd.revents = 0;
1125     }
1126     while( ( i_ret = poll( &ufd, 1, 500 ) ) == 0 );
1127
1128     if( i_ret < 0 )
1129     {
1130         msg_Err( p_access, "Polling error (%m)." );
1131         return -1;
1132     }
1133
1134     i_ret = v4l2_read( p_sys->i_fd, p_buffer, i_len );
1135     if( i_ret == 0 )
1136     {
1137         p_access->info.b_eof = true;
1138     }
1139     else if( i_ret > 0 )
1140     {
1141         p_access->info.i_pos += i_ret;
1142     }
1143
1144     return i_ret;
1145 }
1146
1147 /*****************************************************************************
1148  * Demux: Processes the audio or video frame
1149  *****************************************************************************/
1150 static int Demux( demux_t *p_demux )
1151 {
1152     demux_sys_t *p_sys = p_demux->p_sys;
1153
1154     struct pollfd fd;
1155     fd.fd = p_sys->i_fd;
1156     fd.events = POLLIN|POLLPRI;
1157     fd.revents = 0;
1158
1159     /* Wait for data */
1160     if( poll( &fd, 1, 500 ) ) /* Timeout after 0.5 seconds since I don't know if pf_demux can be blocking. */
1161     {
1162         if( fd.revents & (POLLIN|POLLPRI) )
1163         {
1164             block_t *p_block = GrabVideo( p_demux );
1165             if( p_block )
1166             {
1167                 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
1168                 es_out_Send( p_demux->out, p_sys->p_es, p_block );
1169             }
1170         }
1171     }
1172
1173     return 1;
1174 }
1175
1176 /*****************************************************************************
1177  * GrabVideo: Grab a video frame
1178  *****************************************************************************/
1179 static block_t* GrabVideo( demux_t *p_demux )
1180 {
1181     demux_sys_t *p_sys = p_demux->p_sys;
1182
1183     block_t *p_block = NULL;
1184     struct v4l2_buffer buf;
1185     ssize_t i_ret;
1186
1187     if( p_sys->f_fps >= 0.1 && p_sys->i_video_pts > 0 )
1188     {
1189         mtime_t i_dur = (mtime_t)((double)1000000 / (double)p_sys->f_fps);
1190
1191         /* Did we wait long enough ? (frame rate reduction) */
1192         if( p_sys->i_video_pts + i_dur > mdate() ) return 0;
1193     }
1194
1195     /* Grab Video Frame */
1196     switch( p_sys->io )
1197     {
1198     case IO_METHOD_READ:
1199         i_ret = v4l2_read( p_sys->i_fd, p_sys->p_buffers[0].start, p_sys->p_buffers[0].length );
1200         if( i_ret == -1 )
1201         {
1202             switch( errno )
1203             {
1204             case EAGAIN:
1205                 return 0;
1206             case EIO:
1207                 /* Could ignore EIO, see spec. */
1208                 /* fall through */
1209             default:
1210                 msg_Err( p_demux, "Failed to read frame" );
1211                 return 0;
1212                }
1213         }
1214
1215         p_block = ProcessVideoFrame( p_demux, (uint8_t*)p_sys->p_buffers[0].start, i_ret );
1216         if( !p_block ) return 0;
1217
1218         break;
1219
1220     case IO_METHOD_MMAP:
1221         memset( &buf, 0, sizeof(buf) );
1222         buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1223         buf.memory = V4L2_MEMORY_MMAP;
1224
1225         /* Wait for next frame */
1226         if (v4l2_ioctl( p_sys->i_fd, VIDIOC_DQBUF, &buf ) < 0 )
1227         {
1228             switch( errno )
1229             {
1230             case EAGAIN:
1231                 return 0;
1232             case EIO:
1233                 /* Could ignore EIO, see spec. */
1234                 /* fall through */
1235             default:
1236                 msg_Err( p_demux, "Failed to wait (VIDIOC_DQBUF)" );
1237                 return 0;
1238                }
1239         }
1240
1241         if( buf.index >= p_sys->i_nbuffers ) {
1242             msg_Err( p_demux, "Failed capturing new frame as i>=nbuffers" );
1243             return 0;
1244         }
1245
1246         p_block = ProcessVideoFrame( p_demux, p_sys->p_buffers[buf.index].start, buf.bytesused );
1247         if( !p_block ) return 0;
1248
1249         /* Unlock */
1250         if( v4l2_ioctl( p_sys->i_fd, VIDIOC_QBUF, &buf ) < 0 )
1251         {
1252             msg_Err( p_demux, "Failed to unlock (VIDIOC_QBUF)" );
1253             block_Release( p_block );
1254             return 0;
1255         }
1256
1257         break;
1258
1259     case IO_METHOD_USERPTR:
1260         memset( &buf, 0, sizeof(buf) );
1261         buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1262         buf.memory = V4L2_MEMORY_USERPTR;
1263
1264         /* Wait for next frame */
1265         if (v4l2_ioctl( p_sys->i_fd, VIDIOC_DQBUF, &buf ) < 0 )
1266         {
1267             switch( errno )
1268             {
1269             case EAGAIN:
1270                 return 0;
1271             case EIO:
1272                 /* Could ignore EIO, see spec. */
1273                 /* fall through */
1274             default:
1275                 msg_Err( p_demux, "Failed to wait (VIDIOC_DQBUF)" );
1276                 return 0;
1277             }
1278         }
1279
1280         /* Find frame? */
1281         unsigned int i;
1282         for( i = 0; i < p_sys->i_nbuffers; i++ )
1283         {
1284             if( buf.m.userptr == (unsigned long)p_sys->p_buffers[i].start &&
1285                 buf.length == p_sys->p_buffers[i].length ) break;
1286         }
1287
1288         if( i >= p_sys->i_nbuffers )
1289         {
1290             msg_Err( p_demux, "Failed capturing new frame as i>=nbuffers" );
1291             return 0;
1292         }
1293
1294         p_block = ProcessVideoFrame( p_demux, (uint8_t*)buf.m.userptr, buf.bytesused );
1295         if( !p_block ) return 0;
1296
1297         /* Unlock */
1298         if( v4l2_ioctl( p_sys->i_fd, VIDIOC_QBUF, &buf ) < 0 )
1299         {
1300             msg_Err( p_demux, "Failed to unlock (VIDIOC_QBUF)" );
1301             block_Release( p_block );
1302             return 0;
1303         }
1304
1305         break;
1306
1307     }
1308
1309     /* Timestamp */
1310     p_sys->i_video_pts = p_block->i_pts = p_block->i_dts = mdate();
1311
1312     return p_block;
1313 }
1314
1315 /*****************************************************************************
1316  * ProcessVideoFrame: Helper function to take a buffer and copy it into
1317  * a new block
1318  *****************************************************************************/
1319 static block_t* ProcessVideoFrame( demux_t *p_demux, uint8_t *p_frame, size_t i_size )
1320 {
1321     block_t *p_block;
1322
1323     if( !p_frame ) return 0;
1324
1325     /* New block */
1326     if( !( p_block = block_New( p_demux, i_size ) ) )
1327     {
1328         msg_Warn( p_demux, "Cannot get new block" );
1329         return 0;
1330     }
1331
1332     /* Copy frame */
1333     memcpy( p_block->p_buffer, p_frame, i_size );
1334
1335     return p_block;
1336 }
1337
1338 /*****************************************************************************
1339  * Helper function to initalise video IO using the Read method
1340  *****************************************************************************/
1341 static int InitRead( demux_t *p_demux, unsigned int i_buffer_size )
1342 {
1343     demux_sys_t *p_sys = p_demux->p_sys;
1344
1345     p_sys->p_buffers = calloc( 1, sizeof( *p_sys->p_buffers ) );
1346     if( !p_sys->p_buffers )
1347         return VLC_EGENERIC;
1348
1349     p_sys->p_buffers[0].length = i_buffer_size;
1350     p_sys->p_buffers[0].start = malloc( i_buffer_size );
1351     if( !p_sys->p_buffers[0].start )
1352         return VLC_ENOMEM;
1353
1354     return VLC_SUCCESS;
1355 }
1356
1357 /*****************************************************************************
1358  * Helper function to initalise video IO using the mmap method
1359  *****************************************************************************/
1360 static int InitMmap( demux_t *p_demux, int i_fd )
1361 {
1362     demux_sys_t *p_sys = p_demux->p_sys;
1363     struct v4l2_requestbuffers req;
1364
1365     memset( &req, 0, sizeof(req) );
1366     req.count = 4;
1367     req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1368     req.memory = V4L2_MEMORY_MMAP;
1369
1370     if( v4l2_ioctl( i_fd, VIDIOC_REQBUFS, &req ) < 0 )
1371     {
1372         msg_Err( p_demux, "device does not support mmap i/o" );
1373         goto open_failed;
1374     }
1375
1376     if( req.count < 2 )
1377     {
1378         msg_Err( p_demux, "Insufficient buffer memory" );
1379         goto open_failed;
1380     }
1381
1382     p_sys->p_buffers = calloc( req.count, sizeof( *p_sys->p_buffers ) );
1383     if( !p_sys->p_buffers )
1384         goto open_failed;
1385
1386     for( p_sys->i_nbuffers = 0; p_sys->i_nbuffers < req.count; ++p_sys->i_nbuffers )
1387     {
1388         struct v4l2_buffer buf;
1389
1390         memset( &buf, 0, sizeof(buf) );
1391         buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1392         buf.memory = V4L2_MEMORY_MMAP;
1393         buf.index = p_sys->i_nbuffers;
1394
1395         if( v4l2_ioctl( i_fd, VIDIOC_QUERYBUF, &buf ) < 0 )
1396         {
1397             msg_Err( p_demux, "VIDIOC_QUERYBUF" );
1398             goto open_failed;
1399         }
1400
1401         p_sys->p_buffers[p_sys->i_nbuffers].length = buf.length;
1402         p_sys->p_buffers[p_sys->i_nbuffers].start =
1403             v4l2_mmap( NULL, buf.length, PROT_READ | PROT_WRITE, MAP_SHARED, i_fd, buf.m.offset );
1404
1405         if( p_sys->p_buffers[p_sys->i_nbuffers].start == MAP_FAILED )
1406         {
1407             msg_Err( p_demux, "mmap failed (%m)" );
1408             goto open_failed;
1409         }
1410     }
1411
1412     return VLC_SUCCESS;
1413
1414 open_failed:
1415     return VLC_EGENERIC;
1416
1417 }
1418
1419 /*****************************************************************************
1420  * Helper function to initalise video IO using the userbuf method
1421  *****************************************************************************/
1422 static int InitUserP( demux_t *p_demux, int i_fd, unsigned int i_buffer_size )
1423 {
1424     demux_sys_t *p_sys = p_demux->p_sys;
1425     struct v4l2_requestbuffers req;
1426     unsigned int i_page_size;
1427
1428     i_page_size = sysconf(_SC_PAGESIZE);
1429     i_buffer_size = ( i_buffer_size + i_page_size - 1 ) & ~( i_page_size - 1);
1430
1431     memset( &req, 0, sizeof(req) );
1432     req.count = 4;
1433     req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1434     req.memory = V4L2_MEMORY_USERPTR;
1435
1436     if( v4l2_ioctl( i_fd, VIDIOC_REQBUFS, &req ) < 0 )
1437     {
1438         msg_Err( p_demux, "device does not support user pointer i/o" );
1439         return VLC_EGENERIC;
1440     }
1441
1442     p_sys->p_buffers = calloc( 4, sizeof( *p_sys->p_buffers ) );
1443     if( !p_sys->p_buffers )
1444         goto open_failed;
1445
1446     for( p_sys->i_nbuffers = 0; p_sys->i_nbuffers < 4; ++p_sys->i_nbuffers )
1447     {
1448         p_sys->p_buffers[p_sys->i_nbuffers].length = i_buffer_size;
1449         if( posix_memalign( &p_sys->p_buffers[p_sys->i_nbuffers].start,
1450                 /* boundary */ i_page_size, i_buffer_size ) )
1451             goto open_failed;
1452     }
1453
1454     return VLC_SUCCESS;
1455
1456 open_failed:
1457     free( p_sys->p_buffers );
1458     return VLC_EGENERIC;
1459
1460 }
1461
1462 /*****************************************************************************
1463  * IsPixelFormatSupported: returns true if the specified V4L2 pixel format is
1464  * in the array of supported formats returned by the driver
1465  *****************************************************************************/
1466 static bool IsPixelFormatSupported( demux_t *p_demux, unsigned int i_pixelformat )
1467 {
1468     demux_sys_t *p_sys = p_demux->p_sys;
1469
1470     for( int i_index = 0; i_index < p_sys->i_codec; i_index++ )
1471     {
1472         if( p_sys->p_codecs[i_index].pixelformat == i_pixelformat )
1473             return true;
1474     }
1475
1476     return false;
1477 }
1478
1479 static float GetMaxFrameRate( demux_t *p_demux, int i_fd,
1480                               uint32_t i_pixel_format,
1481                               uint32_t i_width, uint32_t i_height )
1482 {
1483     (void)p_demux;
1484 #ifdef VIDIOC_ENUM_FRAMEINTERVALS
1485     /* This is new in Linux 2.6.19 */
1486     struct v4l2_frmivalenum frmival;
1487     frmival.index = 0;
1488     frmival.pixel_format = i_pixel_format;
1489     frmival.width = i_width;
1490     frmival.height = i_height;
1491     if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMEINTERVALS, &frmival ) >= 0 )
1492     {
1493         switch( frmival.type )
1494         {
1495             case V4L2_FRMIVAL_TYPE_DISCRETE:
1496             {
1497                 float f_fps_max = -1;
1498                 do
1499                 {
1500                     float f_fps = (float)frmival.discrete.denominator
1501                                 / (float)frmival.discrete.numerator;
1502                     if( f_fps > f_fps_max ) f_fps_max = f_fps;
1503                     frmival.index++;
1504                 } while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMEINTERVALS,
1505                                      &frmival ) >= 0 );
1506                 return f_fps_max;
1507             }
1508             case V4L2_FRMSIZE_TYPE_STEPWISE:
1509             case V4L2_FRMIVAL_TYPE_CONTINUOUS:
1510                 return __MAX( (float)frmival.stepwise.max.denominator
1511                             / (float)frmival.stepwise.max.numerator,
1512                               (float)frmival.stepwise.min.denominator
1513                             / (float)frmival.stepwise.min.numerator );
1514         }
1515     }
1516 #endif
1517     return -1.;
1518 }
1519
1520 static float GetAbsoluteMaxFrameRate( demux_t *p_demux, int i_fd,
1521                                       uint32_t i_pixel_format )
1522 {
1523     float f_fps_max = -1.;
1524 #ifdef VIDIOC_ENUM_FRAMESIZES
1525     /* This is new in Linux 2.6.19 */
1526     struct v4l2_frmsizeenum frmsize;
1527     frmsize.index = 0;
1528     frmsize.pixel_format = i_pixel_format;
1529     if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES, &frmsize ) >= 0 )
1530     {
1531         switch( frmsize.type )
1532         {
1533             case V4L2_FRMSIZE_TYPE_DISCRETE:
1534                 do
1535                 {
1536                     frmsize.index++;
1537                     float f_fps = GetMaxFrameRate( p_demux, i_fd,
1538                                                    i_pixel_format,
1539                                                    frmsize.discrete.width,
1540                                                    frmsize.discrete.height );
1541                     if( f_fps > f_fps_max ) f_fps_max = f_fps;
1542                 } while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES,
1543                          &frmsize ) >= 0 );
1544                 break;
1545             case V4L2_FRMSIZE_TYPE_STEPWISE:
1546             {
1547                 uint32_t i_width = frmsize.stepwise.min_width;
1548                 uint32_t i_height = frmsize.stepwise.min_height;
1549                 for( ;
1550                      i_width <= frmsize.stepwise.max_width &&
1551                      i_height <= frmsize.stepwise.max_width;
1552                      i_width += frmsize.stepwise.step_width,
1553                      i_height += frmsize.stepwise.step_height )
1554                 {
1555                     float f_fps = GetMaxFrameRate( p_demux, i_fd,
1556                                                    i_pixel_format,
1557                                                    i_width, i_height );
1558                     if( f_fps > f_fps_max ) f_fps_max = f_fps;
1559                 }
1560                 break;
1561             }
1562             case V4L2_FRMSIZE_TYPE_CONTINUOUS:
1563                 /* FIXME */
1564                 msg_Err( p_demux, "GetAbsoluteMaxFrameRate implementation for V4L2_FRMSIZE_TYPE_CONTINUOUS isn't correct" );
1565                  f_fps_max = GetMaxFrameRate( p_demux, i_fd,
1566                                               i_pixel_format,
1567                                               frmsize.stepwise.max_width,
1568                                               frmsize.stepwise.max_height );
1569                 break;
1570         }
1571     }
1572 #endif
1573     return f_fps_max;
1574 }
1575
1576 static void GetMaxDimensions( demux_t *p_demux, int i_fd,
1577                               uint32_t i_pixel_format, float f_fps_min,
1578                               uint32_t *pi_width, uint32_t *pi_height )
1579 {
1580     *pi_width = 0;
1581     *pi_height = 0;
1582 #ifdef VIDIOC_ENUM_FRAMESIZES
1583     /* This is new in Linux 2.6.19 */
1584     struct v4l2_frmsizeenum frmsize;
1585     frmsize.index = 0;
1586     frmsize.pixel_format = i_pixel_format;
1587     if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES, &frmsize ) >= 0 )
1588     {
1589         switch( frmsize.type )
1590         {
1591             case V4L2_FRMSIZE_TYPE_DISCRETE:
1592                 do
1593                 {
1594                     frmsize.index++;
1595                     float f_fps = GetMaxFrameRate( p_demux, i_fd,
1596                                                    i_pixel_format,
1597                                                    frmsize.discrete.width,
1598                                                    frmsize.discrete.height );
1599                     if( f_fps >= f_fps_min &&
1600                         frmsize.discrete.width > *pi_width )
1601                     {
1602                         *pi_width = frmsize.discrete.width;
1603                         *pi_height = frmsize.discrete.height;
1604                     }
1605                 } while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES,
1606                          &frmsize ) >= 0 );
1607                 break;
1608             case V4L2_FRMSIZE_TYPE_STEPWISE:
1609             {
1610                 uint32_t i_width = frmsize.stepwise.min_width;
1611                 uint32_t i_height = frmsize.stepwise.min_height;
1612                 for( ;
1613                      i_width <= frmsize.stepwise.max_width &&
1614                      i_height <= frmsize.stepwise.max_width;
1615                      i_width += frmsize.stepwise.step_width,
1616                      i_height += frmsize.stepwise.step_height )
1617                 {
1618                     float f_fps = GetMaxFrameRate( p_demux, i_fd,
1619                                                    i_pixel_format,
1620                                                    i_width, i_height );
1621                     if( f_fps >= f_fps_min && i_width > *pi_width )
1622                     {
1623                         *pi_width = i_width;
1624                         *pi_height = i_height;
1625                     }
1626                 }
1627                 break;
1628             }
1629             case V4L2_FRMSIZE_TYPE_CONTINUOUS:
1630                 /* FIXME */
1631                 msg_Err( p_demux, "GetMaxDimension implementation for V4L2_FRMSIZE_TYPE_CONTINUOUS isn't correct" );
1632                 float f_fps = GetMaxFrameRate( p_demux, i_fd,
1633                                                i_pixel_format,
1634                                                frmsize.stepwise.max_width,
1635                                                frmsize.stepwise.max_height );
1636                 if( f_fps >= f_fps_min &&
1637                     frmsize.stepwise.max_width > *pi_width )
1638                 {
1639                     *pi_width = frmsize.stepwise.max_width;
1640                     *pi_height = frmsize.stepwise.max_height;
1641                 }
1642                 break;
1643         }
1644     }
1645 #endif
1646 }
1647
1648 /*****************************************************************************
1649  * OpenVideoDev: open and set up the video device and probe for capabilities
1650  *****************************************************************************/
1651 static int OpenVideoDev( vlc_object_t *p_obj, demux_sys_t *p_sys, bool b_demux )
1652 {
1653     int i_fd;
1654     struct v4l2_cropcap cropcap;
1655     struct v4l2_crop crop;
1656     struct v4l2_format fmt;
1657     unsigned int i_min;
1658     enum v4l2_buf_type buf_type;
1659     const char *psz_device = p_sys->psz_device;
1660     es_format_t es_fmt;
1661     int libv4l2_fd;
1662
1663     if( ( i_fd = open( psz_device, O_RDWR ) ) < 0 )
1664     {
1665         msg_Err( p_obj, "cannot open device (%m)" );
1666         goto open_failed;
1667     }
1668
1669 #ifdef HAVE_LIBV4L2
1670     /* Note the v4l2_xxx functions are designed so that if they get passed an
1671        unknown fd, the will behave exactly as their regular xxx counterparts,
1672        so if v4l2_fd_open fails, we continue as normal (missing the libv4l2
1673        custom cam format to normal formats conversion). Chances are big we will
1674        still fail then though, as normally v4l2_fd_open only fails if the
1675        device is not a v4l2 device. */
1676     libv4l2_fd = v4l2_fd_open( i_fd, V4L2_ENABLE_ENUM_FMT_EMULATION );
1677     if( libv4l2_fd != -1 )
1678         i_fd = libv4l2_fd;
1679 #else
1680     libv4l2_fd = i_fd;
1681 #endif
1682
1683     /* Tune the tuner */
1684     if( p_sys->i_frequency >= 0 )
1685     {
1686         if( p_sys->i_cur_tuner < 0 || p_sys->i_cur_tuner >= p_sys->i_tuner )
1687         {
1688             msg_Err( p_obj, "invalid tuner %d.", p_sys->i_cur_tuner );
1689             goto open_failed;
1690         }
1691         struct v4l2_frequency frequency;
1692         memset( &frequency, 0, sizeof( frequency ) );
1693         frequency.tuner = p_sys->i_cur_tuner;
1694         frequency.type = p_sys->p_tuners[p_sys->i_cur_tuner].type;
1695         frequency.frequency = p_sys->i_frequency / 62.5;
1696         if( v4l2_ioctl( i_fd, VIDIOC_S_FREQUENCY, &frequency ) < 0 )
1697         {
1698             msg_Err( p_obj, "cannot set tuner frequency (%m)" );
1699             goto open_failed;
1700         }
1701         msg_Dbg( p_obj, "Tuner frequency set" );
1702     }
1703
1704     /* Set the tuner's audio mode */
1705     if( p_sys->i_audio_mode >= 0 )
1706     {
1707         if( p_sys->i_cur_tuner < 0 || p_sys->i_cur_tuner >= p_sys->i_tuner )
1708         {
1709             msg_Err( p_obj, "invalid tuner %d.", p_sys->i_cur_tuner );
1710             goto open_failed;
1711         }
1712         struct v4l2_tuner tuner;
1713         memset( &tuner, 0, sizeof( tuner ) );
1714         tuner.index = p_sys->i_cur_tuner;
1715         tuner.audmode = p_sys->i_audio_mode;
1716         if( v4l2_ioctl( i_fd, VIDIOC_S_TUNER, &tuner ) < 0 )
1717         {
1718             msg_Err( p_obj, "cannot set tuner audio mode (%m)" );
1719             goto open_failed;
1720         }
1721         msg_Dbg( p_obj, "Tuner audio mode set" );
1722     }
1723
1724     /* Select standard */
1725
1726     if( p_sys->i_selected_standard_id != V4L2_STD_UNKNOWN )
1727     {
1728         if( v4l2_ioctl( i_fd, VIDIOC_S_STD, &p_sys->i_selected_standard_id ) < 0 )
1729         {
1730             msg_Err( p_obj, "cannot set standard (%m)" );
1731             goto open_failed;
1732         }
1733         msg_Dbg( p_obj, "Set standard" );
1734     }
1735
1736     /* Select input */
1737
1738     if( p_sys->i_selected_input >= p_sys->i_input )
1739     {
1740         msg_Warn( p_obj, "invalid input. Using the default one" );
1741         p_sys->i_selected_input = 0;
1742     }
1743
1744     if( v4l2_ioctl( i_fd, VIDIOC_S_INPUT, &p_sys->i_selected_input ) < 0 )
1745     {
1746         msg_Err( p_obj, "cannot set input (%m)" );
1747         goto open_failed;
1748     }
1749
1750     /* Set audio input */
1751
1752     if( p_sys->i_audio > 0 )
1753     {
1754         if( p_sys->i_selected_audio_input < 0
1755          || p_sys->i_selected_audio_input >= p_sys->i_audio )
1756         {
1757             msg_Warn( p_obj, "invalid audio input. Using the default one" );
1758             p_sys->i_selected_audio_input = 0;
1759         }
1760
1761         if( v4l2_ioctl( i_fd, VIDIOC_S_AUDIO, &p_sys->p_audios[p_sys->i_selected_audio_input] ) < 0 )
1762         {
1763             msg_Err( p_obj, "cannot set audio input (%m)" );
1764             goto open_failed;
1765         }
1766         msg_Dbg( p_obj, "Audio input set to %d", p_sys->i_selected_audio_input );
1767     }
1768
1769
1770     /* TODO: Move the resolution stuff up here */
1771     /* if MPEG encoder card, no need to do anything else after this */
1772     ControlList( p_obj, i_fd,
1773                   var_GetBool( p_obj, "v4l2-controls-reset" ), b_demux );
1774     SetAvailControlsByString( p_obj, p_sys, i_fd );
1775     if( false == b_demux)
1776     {
1777         return i_fd;
1778     }
1779
1780     demux_t *p_demux = (demux_t *) p_obj;
1781
1782     /* Verify device support for the various IO methods */
1783     switch( p_sys->io )
1784     {
1785         case IO_METHOD_READ:
1786             if( !(p_sys->dev_cap.capabilities & V4L2_CAP_READWRITE) )
1787             {
1788                 msg_Err( p_demux, "device does not support read i/o" );
1789                 goto open_failed;
1790             }
1791             break;
1792
1793         case IO_METHOD_MMAP:
1794         case IO_METHOD_USERPTR:
1795             if( !(p_sys->dev_cap.capabilities & V4L2_CAP_STREAMING) )
1796             {
1797                 msg_Err( p_demux, "device does not support streaming i/o" );
1798                 goto open_failed;
1799             }
1800             break;
1801
1802         default:
1803             msg_Err( p_demux, "io method not supported" );
1804             goto open_failed;
1805     }
1806
1807     /* Reset Cropping */
1808     memset( &cropcap, 0, sizeof(cropcap) );
1809     cropcap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1810     if( v4l2_ioctl( i_fd, VIDIOC_CROPCAP, &cropcap ) >= 0 )
1811     {
1812         crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1813         crop.c = cropcap.defrect; /* reset to default */
1814         if( v4l2_ioctl( i_fd, VIDIOC_S_CROP, &crop ) < 0 )
1815         {
1816             switch( errno )
1817             {
1818                 case EINVAL:
1819                     /* Cropping not supported. */
1820                     break;
1821                 default:
1822                     /* Errors ignored. */
1823                     break;
1824             }
1825         }
1826     }
1827
1828     /* Try and find default resolution if not specified */
1829     memset( &fmt, 0, sizeof(fmt) );
1830     fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1831
1832     if( p_sys->i_width == 0 || p_sys->i_height == 0 )
1833     {
1834         /* Use current width and height settings */
1835         if( v4l2_ioctl( i_fd, VIDIOC_G_FMT, &fmt ) < 0 )
1836         {
1837             msg_Err( p_demux, "Cannot get default width and height." );
1838             goto open_failed;
1839         }
1840
1841         p_sys->i_width = fmt.fmt.pix.width;
1842         p_sys->i_height = fmt.fmt.pix.height;
1843
1844         if( fmt.fmt.pix.field == V4L2_FIELD_ALTERNATE )
1845         {
1846             p_sys->i_height = p_sys->i_height * 2;
1847         }
1848     }
1849     else if( p_sys->i_width < 0 || p_sys->i_height < 0 )
1850     {
1851         msg_Dbg( p_demux, "will try to find optimal width and height." );
1852     }
1853     else
1854     {
1855         /* Use user specified width and height */
1856         msg_Dbg( p_demux, "trying specified size %dx%d", p_sys->i_width, p_sys->i_height );
1857     }
1858
1859     fmt.fmt.pix.width = p_sys->i_width;
1860     fmt.fmt.pix.height = p_sys->i_height;
1861     fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
1862
1863     /* Test and set Chroma */
1864     fmt.fmt.pix.pixelformat = 0;
1865     if( p_sys->psz_requested_chroma && strlen( p_sys->psz_requested_chroma ) > 0 )
1866     {
1867         /* User specified chroma */
1868         if( strlen( p_sys->psz_requested_chroma ) >= 4 )
1869         {
1870             int i_requested_fourcc = VLC_FOURCC(
1871                 p_sys->psz_requested_chroma[0], p_sys->psz_requested_chroma[1],
1872                 p_sys->psz_requested_chroma[2], p_sys->psz_requested_chroma[3] );
1873             for( int i = 0; v4l2chroma_to_fourcc[i].i_v4l2 != 0; i++ )
1874             {
1875                 if( v4l2chroma_to_fourcc[i].i_fourcc == i_requested_fourcc )
1876                 {
1877                     fmt.fmt.pix.pixelformat = v4l2chroma_to_fourcc[i].i_v4l2;
1878                     break;
1879                 }
1880             }
1881         }
1882         /* Try and set user chroma */
1883         if( !IsPixelFormatSupported( p_demux, fmt.fmt.pix.pixelformat ) || ( fmt.fmt.pix.pixelformat && v4l2_ioctl( i_fd, VIDIOC_S_FMT, &fmt ) < 0 ) )
1884         {
1885             msg_Warn( p_demux, "Driver is unable to use specified chroma %s. Trying defaults.", p_sys->psz_requested_chroma );
1886             fmt.fmt.pix.pixelformat = 0;
1887         }
1888     }
1889
1890     /* If no user specified chroma, find best */
1891     /* This also decides if MPEG encoder card or not */
1892     if( !fmt.fmt.pix.pixelformat )
1893     {
1894         unsigned int i;
1895         for( i = 0; i < ARRAY_SIZE( p_chroma_fallbacks ); i++ )
1896         {
1897             fmt.fmt.pix.pixelformat = p_chroma_fallbacks[i];
1898             if( IsPixelFormatSupported( p_demux, fmt.fmt.pix.pixelformat )
1899              && v4l2_ioctl( i_fd, VIDIOC_S_FMT, &fmt ) >= 0 )
1900                 break;
1901         }
1902         if( i == ARRAY_SIZE( p_chroma_fallbacks ) )
1903         {
1904             msg_Warn( p_demux, "Could not select any of the default chromas; attempting to open as MPEG encoder card (access)" );
1905             goto open_failed;
1906         }
1907     }
1908
1909     if( p_sys->i_width < 0 || p_sys->i_height < 0 )
1910     {
1911         if( p_sys->f_fps <= 0 )
1912         {
1913             p_sys->f_fps = GetAbsoluteMaxFrameRate( p_demux, i_fd,
1914                                                     fmt.fmt.pix.pixelformat );
1915             msg_Dbg( p_demux, "Found maximum framerate of %f", p_sys->f_fps );
1916         }
1917         GetMaxDimensions( p_demux, i_fd,
1918                           fmt.fmt.pix.pixelformat, p_sys->f_fps,
1919                           &fmt.fmt.pix.width, &fmt.fmt.pix.height );
1920         msg_Dbg( p_demux, "Found optimal dimensions for framerate %f of %dx%d",
1921                  p_sys->f_fps, fmt.fmt.pix.width, fmt.fmt.pix.height );
1922         if( v4l2_ioctl( i_fd, VIDIOC_S_FMT, &fmt ) < 0 ) {;}
1923     }
1924
1925     /* Reassign width, height and chroma incase driver override */
1926     p_sys->i_width = fmt.fmt.pix.width;
1927     p_sys->i_height = fmt.fmt.pix.height;
1928
1929     /* Look up final fourcc */
1930     p_sys->i_fourcc = 0;
1931     for( int i = 0; v4l2chroma_to_fourcc[i].i_fourcc != 0; i++ )
1932     {
1933         if( v4l2chroma_to_fourcc[i].i_v4l2 == fmt.fmt.pix.pixelformat )
1934         {
1935             p_sys->i_fourcc = v4l2chroma_to_fourcc[i].i_fourcc;
1936             es_format_Init( &es_fmt, VIDEO_ES, p_sys->i_fourcc );
1937             es_fmt.video.i_rmask = v4l2chroma_to_fourcc[i].i_rmask;
1938             es_fmt.video.i_gmask = v4l2chroma_to_fourcc[i].i_gmask;
1939             es_fmt.video.i_bmask = v4l2chroma_to_fourcc[i].i_bmask;
1940             break;
1941         }
1942     }
1943
1944     /* Buggy driver paranoia */
1945     i_min = fmt.fmt.pix.width * 2;
1946     if( fmt.fmt.pix.bytesperline < i_min )
1947         fmt.fmt.pix.bytesperline = i_min;
1948     i_min = fmt.fmt.pix.bytesperline * fmt.fmt.pix.height;
1949     if( fmt.fmt.pix.sizeimage < i_min )
1950         fmt.fmt.pix.sizeimage = i_min;
1951
1952 #ifdef VIDIOC_ENUM_FRAMEINTERVALS
1953     /* This is new in Linux 2.6.19 */
1954     /* List supported frame rates */
1955     struct v4l2_frmivalenum frmival;
1956     frmival.index = 0;
1957     frmival.pixel_format = fmt.fmt.pix.pixelformat;
1958     frmival.width = p_sys->i_width;
1959     frmival.height = p_sys->i_height;
1960     if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMEINTERVALS, &frmival ) >= 0 )
1961     {
1962         char psz_fourcc[5];
1963         memset( &psz_fourcc, 0, sizeof( psz_fourcc ) );
1964         vlc_fourcc_to_char( p_sys->i_fourcc, &psz_fourcc );
1965         msg_Dbg( p_demux, "supported frame intervals for %4s, %dx%d:",
1966                  psz_fourcc, frmival.width, frmival.height );
1967         switch( frmival.type )
1968         {
1969             case V4L2_FRMIVAL_TYPE_DISCRETE:
1970                 do
1971                 {
1972                     msg_Dbg( p_demux, "    supported frame interval: %d/%d",
1973                              frmival.discrete.numerator,
1974                              frmival.discrete.denominator );
1975                     frmival.index++;
1976                 } while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMEINTERVALS, &frmival ) >= 0 );
1977                 break;
1978             case V4L2_FRMIVAL_TYPE_STEPWISE:
1979                 msg_Dbg( p_demux, "    supported frame intervals: %d/%d to "
1980                          "%d/%d using %d/%d increments",
1981                          frmival.stepwise.min.numerator,
1982                          frmival.stepwise.min.denominator,
1983                          frmival.stepwise.max.numerator,
1984                          frmival.stepwise.max.denominator,
1985                          frmival.stepwise.step.numerator,
1986                          frmival.stepwise.step.denominator );
1987                 break;
1988             case V4L2_FRMIVAL_TYPE_CONTINUOUS:
1989                 msg_Dbg( p_demux, "    supported frame intervals: %d/%d to %d/%d",
1990                          frmival.stepwise.min.numerator,
1991                          frmival.stepwise.min.denominator,
1992                          frmival.stepwise.max.numerator,
1993                          frmival.stepwise.max.denominator );
1994                 break;
1995         }
1996     }
1997 #endif
1998
1999
2000     /* Init IO method */
2001     switch( p_sys->io )
2002     {
2003     case IO_METHOD_READ:
2004         if( InitRead( p_demux, fmt.fmt.pix.sizeimage ) != VLC_SUCCESS ) goto open_failed;
2005         break;
2006
2007     case IO_METHOD_MMAP:
2008         if( InitMmap( p_demux, i_fd ) != VLC_SUCCESS ) goto open_failed;
2009         break;
2010
2011     case IO_METHOD_USERPTR:
2012         if( InitUserP( p_demux, i_fd, fmt.fmt.pix.sizeimage ) != VLC_SUCCESS ) goto open_failed;
2013         break;
2014
2015     }
2016
2017     /* Add */
2018     es_fmt.video.i_width  = p_sys->i_width;
2019     es_fmt.video.i_height = p_sys->i_height;
2020     es_fmt.video.i_aspect = 4 * VOUT_ASPECT_FACTOR / 3;
2021
2022     msg_Dbg( p_demux, "added new video es %4.4s %dx%d",
2023         (char*)&es_fmt.i_codec, es_fmt.video.i_width, es_fmt.video.i_height );
2024     p_sys->p_es = es_out_Add( p_demux->out, &es_fmt );
2025
2026     /* Start Capture */
2027
2028     switch( p_sys->io )
2029     {
2030     case IO_METHOD_READ:
2031         /* Nothing to do */
2032         break;
2033
2034     case IO_METHOD_MMAP:
2035         for (unsigned int i = 0; i < p_sys->i_nbuffers; ++i)
2036         {
2037             struct v4l2_buffer buf;
2038
2039             memset( &buf, 0, sizeof(buf) );
2040             buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2041             buf.memory = V4L2_MEMORY_MMAP;
2042             buf.index = i;
2043
2044             if( v4l2_ioctl( i_fd, VIDIOC_QBUF, &buf ) < 0 )
2045             {
2046                 msg_Err( p_demux, "VIDIOC_QBUF failed" );
2047                 goto open_failed;
2048             }
2049         }
2050
2051         buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2052         if( v4l2_ioctl( i_fd, VIDIOC_STREAMON, &buf_type ) < 0 )
2053         {
2054             msg_Err( p_demux, "VIDIOC_STREAMON failed" );
2055             goto open_failed;
2056         }
2057
2058         break;
2059
2060     case IO_METHOD_USERPTR:
2061         for( unsigned int i = 0; i < p_sys->i_nbuffers; ++i )
2062         {
2063             struct v4l2_buffer buf;
2064
2065             memset( &buf, 0, sizeof(buf) );
2066             buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2067             buf.memory = V4L2_MEMORY_USERPTR;
2068             buf.index = i;
2069             buf.m.userptr = (unsigned long)p_sys->p_buffers[i].start;
2070             buf.length = p_sys->p_buffers[i].length;
2071
2072             if( v4l2_ioctl( i_fd, VIDIOC_QBUF, &buf ) < 0 )
2073             {
2074                 msg_Err( p_demux, "VIDIOC_QBUF failed" );
2075                 goto open_failed;
2076             }
2077         }
2078
2079         buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2080         if( v4l2_ioctl( i_fd, VIDIOC_STREAMON, &buf_type ) < 0 )
2081         {
2082             msg_Err( p_demux, "VIDIOC_STREAMON failed" );
2083             goto open_failed;
2084         }
2085
2086         break;
2087     }
2088
2089     /* report fps */
2090     if( p_sys->f_fps >= 0.1 )
2091     {
2092         msg_Dbg( p_demux, "User set fps=%f", p_sys->f_fps );
2093     }
2094
2095     return i_fd;
2096
2097 open_failed:
2098     if( i_fd >= 0 ) v4l2_close( i_fd );
2099     return -1;
2100
2101 }
2102
2103 /*****************************************************************************
2104  * ProbeVideoDev: probe video for capabilities
2105  *****************************************************************************/
2106 static bool ProbeVideoDev( vlc_object_t *p_obj, demux_sys_t *p_sys,
2107                                  const char *psz_device )
2108 {
2109     int i_index;
2110     int i_standard;
2111
2112     int i_fd;
2113     int libv4l2_fd;
2114
2115     if( ( i_fd = open( psz_device, O_RDWR ) ) < 0 )
2116     {
2117         msg_Err( p_obj, "cannot open video device '%s' (%m)", psz_device );
2118         goto open_failed;
2119     }
2120
2121 #ifdef HAVE_LIBV4L2
2122     /* Note the v4l2_xxx functions are designed so that if they get passed an
2123        unknown fd, the will behave exactly as their regular xxx counterparts,
2124        so if v4l2_fd_open fails, we continue as normal (missing the libv4l2
2125        custom cam format to normal formats conversion). Chances are big we will
2126        still fail then though, as normally v4l2_fd_open only fails if the
2127        device is not a v4l2 device. */
2128     libv4l2_fd = v4l2_fd_open( i_fd, V4L2_ENABLE_ENUM_FMT_EMULATION );
2129     if( libv4l2_fd != -1 )
2130         i_fd = libv4l2_fd;
2131 #else
2132     libv4l2_fd = i_fd;
2133 #endif
2134
2135     /* Get device capabilites */
2136
2137     if( v4l2_ioctl( i_fd, VIDIOC_QUERYCAP, &p_sys->dev_cap ) < 0 )
2138     {
2139         msg_Err( p_obj, "cannot get video capabilities (%m)" );
2140         goto open_failed;
2141     }
2142
2143     msg_Dbg( p_obj, "V4L2 device: %s using driver: %s (version: %u.%u.%u) on %s",
2144                             p_sys->dev_cap.card,
2145                             p_sys->dev_cap.driver,
2146                             (p_sys->dev_cap.version >> 16) & 0xFF,
2147                             (p_sys->dev_cap.version >> 8) & 0xFF,
2148                             p_sys->dev_cap.version & 0xFF,
2149                             p_sys->dev_cap.bus_info );
2150
2151     msg_Dbg( p_obj, "the device has the capabilities: (%c) Video Capure, "
2152                                                        "(%c) Audio, "
2153                                                        "(%c) Tuner",
2154              ( p_sys->dev_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE  ? 'X':' '),
2155              ( p_sys->dev_cap.capabilities & V4L2_CAP_AUDIO  ? 'X':' '),
2156              ( p_sys->dev_cap.capabilities & V4L2_CAP_TUNER  ? 'X':' ') );
2157
2158     msg_Dbg( p_obj, "supported I/O methods are: (%c) Read/Write, "
2159                                                  "(%c) Streaming, "
2160                                                  "(%c) Asynchronous",
2161             ( p_sys->dev_cap.capabilities & V4L2_CAP_READWRITE ? 'X':' ' ),
2162             ( p_sys->dev_cap.capabilities & V4L2_CAP_STREAMING ? 'X':' ' ),
2163             ( p_sys->dev_cap.capabilities & V4L2_CAP_ASYNCIO ? 'X':' ' ) );
2164
2165     /* Now, enumerate all the video inputs. This is useless at the moment
2166        since we have no way to present that info to the user except with
2167        debug messages */
2168
2169     if( p_sys->dev_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE )
2170     {
2171         struct v4l2_input t_input;
2172         t_input.index = 0;
2173         while( v4l2_ioctl( i_fd, VIDIOC_ENUMINPUT, &t_input ) >= 0 )
2174         {
2175             p_sys->i_input++;
2176             t_input.index = p_sys->i_input;
2177         }
2178
2179         p_sys->p_inputs = calloc( 1, p_sys->i_input * sizeof( struct v4l2_input ) );
2180         if( !p_sys->p_inputs ) goto open_failed;
2181
2182         for( i_index = 0; i_index < p_sys->i_input; i_index++ )
2183         {
2184             p_sys->p_inputs[i_index].index = i_index;
2185
2186             if( v4l2_ioctl( i_fd, VIDIOC_ENUMINPUT, &p_sys->p_inputs[i_index] ) )
2187             {
2188                 msg_Err( p_obj, "cannot get video input characteristics (%m)" );
2189                 goto open_failed;
2190             }
2191             msg_Dbg( p_obj, "video input %i (%s) has type: %s %c",
2192                                 i_index,
2193                                 p_sys->p_inputs[i_index].name,
2194                                 p_sys->p_inputs[i_index].type
2195                                         == V4L2_INPUT_TYPE_TUNER ?
2196                                         "Tuner adapter" :
2197                                         "External analog input",
2198                                 i_index == p_sys->i_selected_input ? '*' : ' ' );
2199         }
2200     }
2201
2202     /* Probe video standards */
2203     if( p_sys->dev_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE )
2204     {
2205         struct v4l2_standard t_standards;
2206         t_standards.index = 0;
2207         while( v4l2_ioctl( i_fd, VIDIOC_ENUMSTD, &t_standards ) >=0 )
2208         {
2209             p_sys->i_standard++;
2210             t_standards.index = p_sys->i_standard;
2211         }
2212
2213         p_sys->p_standards = calloc( 1, p_sys->i_standard * sizeof( struct v4l2_standard ) );
2214         if( !p_sys->p_standards ) goto open_failed;
2215
2216         for( i_standard = 0; i_standard < p_sys->i_standard; i_standard++ )
2217         {
2218             p_sys->p_standards[i_standard].index = i_standard;
2219
2220             if( v4l2_ioctl( i_fd, VIDIOC_ENUMSTD, &p_sys->p_standards[i_standard] ) )
2221             {
2222                 msg_Err( p_obj, "cannot get video input standards (%m)" );
2223                 goto open_failed;
2224             }
2225             msg_Dbg( p_obj, "video standard %i is: %s %c",
2226                                 i_standard,
2227                                 p_sys->p_standards[i_standard].name,
2228                                 (unsigned)i_standard == p_sys->i_selected_standard_id ? '*' : ' ' );
2229         }
2230     }
2231
2232     /* initialize the structures for the ioctls */
2233     for( i_index = 0; i_index < 32; i_index++ )
2234     {
2235         p_sys->p_audios[i_index].index = i_index;
2236     }
2237
2238     /* Probe audio inputs */
2239     if( p_sys->dev_cap.capabilities & V4L2_CAP_AUDIO )
2240     {
2241         while( p_sys->i_audio < 32 &&
2242                v4l2_ioctl( i_fd, VIDIOC_S_AUDIO, &p_sys->p_audios[p_sys->i_audio] ) >= 0 )
2243         {
2244             if( v4l2_ioctl( i_fd, VIDIOC_G_AUDIO, &p_sys->p_audios[ p_sys->i_audio] ) < 0 )
2245             {
2246                 msg_Err( p_obj, "cannot get audio input characteristics (%m)" );
2247                 goto open_failed;
2248             }
2249
2250             msg_Dbg( p_obj, "audio input %i (%s) is %s %s %c",
2251                                 p_sys->i_audio,
2252                                 p_sys->p_audios[p_sys->i_audio].name,
2253                                 p_sys->p_audios[p_sys->i_audio].capability &
2254                                                     V4L2_AUDCAP_STEREO ?
2255                                         "Stereo" : "Mono",
2256                                 p_sys->p_audios[p_sys->i_audio].capability &
2257                                                     V4L2_AUDCAP_AVL ?
2258                                     "(Automatic Volume Level supported)" : "",
2259                                 p_sys->i_audio == p_sys->i_selected_audio_input ? '*' : ' ' );
2260
2261             p_sys->i_audio++;
2262         }
2263     }
2264
2265     /* List tuner caps */
2266     if( p_sys->dev_cap.capabilities & V4L2_CAP_TUNER )
2267     {
2268         struct v4l2_tuner tuner;
2269         memset( &tuner, 0, sizeof(tuner) );
2270         while( v4l2_ioctl( i_fd, VIDIOC_G_TUNER, &tuner ) >= 0 )
2271         {
2272             p_sys->i_tuner++;
2273             memset( &tuner, 0, sizeof(tuner) );
2274             tuner.index = p_sys->i_tuner;
2275         }
2276
2277         p_sys->p_tuners = calloc( 1, p_sys->i_tuner * sizeof( struct v4l2_tuner ) );
2278         if( !p_sys->p_tuners ) goto open_failed;
2279
2280         for( i_index = 0; i_index < p_sys->i_tuner; i_index++ )
2281         {
2282             p_sys->p_tuners[i_index].index = i_index;
2283
2284             if( v4l2_ioctl( i_fd, VIDIOC_G_TUNER, &p_sys->p_tuners[i_index] ) )
2285             {
2286                 msg_Err( p_obj, "cannot get tuner characteristics (%m)" );
2287                 goto open_failed;
2288             }
2289             msg_Dbg( p_obj, "tuner %i (%s) has type: %s, "
2290                               "frequency range: %.1f %s -> %.1f %s",
2291                                 i_index,
2292                                 p_sys->p_tuners[i_index].name,
2293                                 p_sys->p_tuners[i_index].type
2294                                         == V4L2_TUNER_RADIO ?
2295                                         "Radio" : "Analog TV",
2296                                 p_sys->p_tuners[i_index].rangelow * 62.5,
2297                                 p_sys->p_tuners[i_index].capability &
2298                                         V4L2_TUNER_CAP_LOW ?
2299                                         "Hz" : "kHz",
2300                                 p_sys->p_tuners[i_index].rangehigh * 62.5,
2301                                 p_sys->p_tuners[i_index].capability &
2302                                         V4L2_TUNER_CAP_LOW ?
2303                                         "Hz" : "kHz" );
2304
2305             struct v4l2_frequency frequency;
2306             memset( &frequency, 0, sizeof( frequency ) );
2307             if( v4l2_ioctl( i_fd, VIDIOC_G_FREQUENCY, &frequency ) < 0 )
2308             {
2309                 msg_Err( p_obj, "cannot get tuner frequency (%m)" );
2310                 goto open_failed;
2311             }
2312             msg_Dbg( p_obj, "tuner %i (%s) frequency: %.1f %s",
2313                      i_index,
2314                      p_sys->p_tuners[i_index].name,
2315                      frequency.frequency * 62.5,
2316                      p_sys->p_tuners[i_index].capability &
2317                              V4L2_TUNER_CAP_LOW ?
2318                              "Hz" : "kHz" );
2319         }
2320     }
2321
2322     /* Probe for available chromas */
2323     if( p_sys->dev_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE )
2324     {
2325         struct v4l2_fmtdesc codec;
2326
2327         i_index = 0;
2328         memset( &codec, 0, sizeof(codec) );
2329         codec.index = i_index;
2330         codec.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2331
2332         while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FMT, &codec ) >= 0 )
2333         {
2334             i_index++;
2335             codec.index = i_index;
2336         }
2337
2338         p_sys->i_codec = i_index;
2339
2340         p_sys->p_codecs = calloc( 1, p_sys->i_codec * sizeof( struct v4l2_fmtdesc ) );
2341
2342         for( i_index = 0; i_index < p_sys->i_codec; i_index++ )
2343         {
2344             p_sys->p_codecs[i_index].index = i_index;
2345             p_sys->p_codecs[i_index].type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2346
2347             if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FMT, &p_sys->p_codecs[i_index] ) < 0 )
2348             {
2349                 msg_Err( p_obj, "cannot get codec description (%m)" );
2350                 goto open_failed;
2351             }
2352
2353             /* only print if vlc supports the format */
2354             char psz_fourcc_v4l2[5];
2355             memset( &psz_fourcc_v4l2, 0, sizeof( psz_fourcc_v4l2 ) );
2356             vlc_fourcc_to_char( p_sys->p_codecs[i_index].pixelformat,
2357                                 &psz_fourcc_v4l2 );
2358             bool b_codec_supported = false;
2359             for( int i = 0; v4l2chroma_to_fourcc[i].i_v4l2 != 0; i++ )
2360             {
2361                 if( v4l2chroma_to_fourcc[i].i_v4l2 == p_sys->p_codecs[i_index].pixelformat )
2362                 {
2363                     b_codec_supported = true;
2364
2365                     char psz_fourcc[5];
2366                     memset( &psz_fourcc, 0, sizeof( psz_fourcc ) );
2367                     vlc_fourcc_to_char( v4l2chroma_to_fourcc[i].i_fourcc,
2368                                         &psz_fourcc );
2369                     msg_Dbg( p_obj, "device supports chroma %4s [%s, %s]",
2370                                 psz_fourcc,
2371                                 p_sys->p_codecs[i_index].description,
2372                                 psz_fourcc_v4l2 );
2373
2374 #ifdef VIDIOC_ENUM_FRAMESIZES
2375                     /* This is new in Linux 2.6.19 */
2376                     /* List valid frame sizes for this format */
2377                     struct v4l2_frmsizeenum frmsize;
2378                     frmsize.index = 0;
2379                     frmsize.pixel_format = p_sys->p_codecs[i_index].pixelformat;
2380                     if( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES, &frmsize ) < 0 )
2381                     {
2382                         /* Not all devices support this ioctl */
2383                         msg_Warn( p_obj, "Unable to query for frame sizes" );
2384                     }
2385                     else
2386                     {
2387                         switch( frmsize.type )
2388                         {
2389                             case V4L2_FRMSIZE_TYPE_DISCRETE:
2390                                 do
2391                                 {
2392                                     msg_Dbg( p_obj,
2393                 "    device supports size %dx%d",
2394                 frmsize.discrete.width, frmsize.discrete.height );
2395                                     frmsize.index++;
2396                                 } while( v4l2_ioctl( i_fd, VIDIOC_ENUM_FRAMESIZES, &frmsize ) >= 0 );
2397                                 break;
2398                             case V4L2_FRMSIZE_TYPE_STEPWISE:
2399                                 msg_Dbg( p_obj,
2400                 "    device supports sizes %dx%d to %dx%d using %dx%d increments",
2401                 frmsize.stepwise.min_width, frmsize.stepwise.min_height,
2402                 frmsize.stepwise.max_width, frmsize.stepwise.max_height,
2403                 frmsize.stepwise.step_width, frmsize.stepwise.step_height );
2404                                 break;
2405                             case V4L2_FRMSIZE_TYPE_CONTINUOUS:
2406                                 msg_Dbg( p_obj,
2407                 "    device supports all sizes %dx%d to %dx%d",
2408                 frmsize.stepwise.min_width, frmsize.stepwise.min_height,
2409                 frmsize.stepwise.max_width, frmsize.stepwise.max_height );
2410                                 break;
2411                         }
2412                     }
2413 #endif
2414                 }
2415             }
2416             if( !b_codec_supported )
2417             {
2418                     msg_Dbg( p_obj,
2419                          "device codec %4s (%s) not supported",
2420                          psz_fourcc_v4l2,
2421                          p_sys->p_codecs[i_index].description );
2422             }
2423         }
2424     }
2425
2426
2427     if( i_fd >= 0 ) v4l2_close( i_fd );
2428     return true;
2429
2430 open_failed:
2431
2432     if( i_fd >= 0 ) v4l2_close( i_fd );
2433     return false;
2434
2435 }
2436
2437 static void name2var( unsigned char *name )
2438 {
2439     for( ; *name; name++ )
2440         *name = (*name == ' ') ? '_' : tolower( *name );
2441 }
2442
2443 /*****************************************************************************
2444  * Print a user-class v4l2 control's details, create the relevant variable,
2445  * change the value if needed.
2446  *****************************************************************************/
2447 static void ControlListPrint( vlc_object_t *p_obj, int i_fd,
2448                               struct v4l2_queryctrl queryctrl,
2449                               bool b_reset, bool b_demux )
2450 {
2451     struct v4l2_querymenu querymenu;
2452     unsigned int i_mid;
2453
2454     int i;
2455     int i_val;
2456
2457     char *psz_name;
2458     vlc_value_t val, val2;
2459
2460     if( queryctrl.flags & V4L2_CTRL_FLAG_GRABBED )
2461         msg_Dbg( p_obj, "    control is busy" );
2462     if( queryctrl.flags & V4L2_CTRL_FLAG_READ_ONLY )
2463         msg_Dbg( p_obj, "    control is read-only" );
2464
2465     for( i = 0; controls[i].psz_name != NULL; i++ )
2466         if( controls[i].i_cid == queryctrl.id ) break;
2467
2468     if( controls[i].psz_name )
2469     {
2470         psz_name = strdup( controls[i].psz_name );
2471         char psz_cfg_name[40];
2472         sprintf( psz_cfg_name, CFG_PREFIX "%s", psz_name );
2473         i_val = var_CreateGetInteger( p_obj, psz_cfg_name );
2474         var_Destroy( p_obj, psz_cfg_name );
2475     }
2476     else
2477     {
2478         psz_name = strdup( (const char *)queryctrl.name );
2479         name2var( (unsigned char *)psz_name );
2480         i_val = -1;
2481     }
2482
2483     switch( queryctrl.type )
2484     {
2485         case V4L2_CTRL_TYPE_INTEGER:
2486             msg_Dbg( p_obj, "    integer control" );
2487             msg_Dbg( p_obj,
2488                      "    valid values: %d to %d by steps of %d",
2489                      queryctrl.minimum, queryctrl.maximum,
2490                      queryctrl.step );
2491
2492             var_Create( p_obj, psz_name,
2493                         VLC_VAR_INTEGER | VLC_VAR_HASMIN | VLC_VAR_HASMAX
2494                       | VLC_VAR_HASSTEP | VLC_VAR_ISCOMMAND );
2495             val.i_int = queryctrl.minimum;
2496             var_Change( p_obj, psz_name, VLC_VAR_SETMIN, &val, NULL );
2497             val.i_int = queryctrl.maximum;
2498             var_Change( p_obj, psz_name, VLC_VAR_SETMAX, &val, NULL );
2499             val.i_int = queryctrl.step;
2500             var_Change( p_obj, psz_name, VLC_VAR_SETSTEP, &val, NULL );
2501             break;
2502         case V4L2_CTRL_TYPE_BOOLEAN:
2503             msg_Dbg( p_obj, "    boolean control" );
2504             var_Create( p_obj, psz_name,
2505                         VLC_VAR_BOOL | VLC_VAR_ISCOMMAND );
2506             break;
2507         case V4L2_CTRL_TYPE_MENU:
2508             msg_Dbg( p_obj, "    menu control" );
2509             var_Create( p_obj, psz_name,
2510                         VLC_VAR_INTEGER | VLC_VAR_HASCHOICE
2511                       | VLC_VAR_ISCOMMAND );
2512             memset( &querymenu, 0, sizeof( querymenu ) );
2513             for( i_mid = queryctrl.minimum;
2514                  i_mid <= (unsigned)queryctrl.maximum;
2515                  i_mid++ )
2516             {
2517                 querymenu.index = i_mid;
2518                 querymenu.id = queryctrl.id;
2519                 if( v4l2_ioctl( i_fd, VIDIOC_QUERYMENU, &querymenu ) >= 0 )
2520                 {
2521                     msg_Dbg( p_obj, "        %d: %s",
2522                              querymenu.index, querymenu.name );
2523                     val.i_int = querymenu.index;
2524                     val2.psz_string = (char *)querymenu.name;
2525                     var_Change( p_obj, psz_name,
2526                                 VLC_VAR_ADDCHOICE, &val, &val2 );
2527                 }
2528             }
2529             break;
2530         case V4L2_CTRL_TYPE_BUTTON:
2531             msg_Dbg( p_obj, "    button control" );
2532             var_Create( p_obj, psz_name,
2533                         VLC_VAR_VOID | VLC_VAR_ISCOMMAND );
2534             break;
2535         case V4L2_CTRL_TYPE_CTRL_CLASS:
2536             msg_Dbg( p_obj, "    control class" );
2537             var_Create( p_obj, psz_name, VLC_VAR_VOID );
2538             break;
2539         default:
2540             msg_Dbg( p_obj, "    unknown control type (FIXME)" );
2541             /* FIXME */
2542             break;
2543     }
2544
2545     switch( queryctrl.type )
2546     {
2547         case V4L2_CTRL_TYPE_INTEGER:
2548         case V4L2_CTRL_TYPE_BOOLEAN:
2549         case V4L2_CTRL_TYPE_MENU:
2550             {
2551                 struct v4l2_control control;
2552                 msg_Dbg( p_obj, "    default value: %d",
2553                          queryctrl.default_value );
2554                 memset( &control, 0, sizeof( control ) );
2555                 control.id = queryctrl.id;
2556                 if( v4l2_ioctl( i_fd, VIDIOC_G_CTRL, &control ) >= 0 )
2557                 {
2558                     msg_Dbg( p_obj, "    current value: %d", control.value );
2559                 }
2560                 if( i_val == -1 )
2561                 {
2562                     i_val = control.value;
2563                     if( b_reset && queryctrl.default_value != control.value )
2564                     {
2565                         msg_Dbg( p_obj, "    reset value to default" );
2566                         Control( p_obj, i_fd, psz_name,
2567                                       queryctrl.id, queryctrl.default_value );
2568                     }
2569                 }
2570                 else
2571                 {
2572                     Control( p_obj, i_fd, psz_name,
2573                                   queryctrl.id, i_val );
2574                 }
2575             }
2576             break;
2577         default:
2578             break;
2579     }
2580
2581     val.psz_string = (char *)queryctrl.name;
2582     var_Change( p_obj, psz_name, VLC_VAR_SETTEXT, &val, NULL );
2583     val.i_int = queryctrl.id;
2584     val2.psz_string = (char *)psz_name;
2585     var_Change( p_obj, "allcontrols", VLC_VAR_ADDCHOICE, &val, &val2 );
2586     /* bad things happen changing MPEG mid-stream
2587      * so don't add to Ext Settings GUI */
2588     if( V4L2_CTRL_ID2CLASS( queryctrl.id ) != V4L2_CTRL_CLASS_MPEG )
2589         var_Change( p_obj, "controls", VLC_VAR_ADDCHOICE, &val, &val2 );
2590
2591     switch( var_Type( p_obj, psz_name ) & VLC_VAR_TYPE )
2592     {
2593         case VLC_VAR_BOOL:
2594             var_SetBool( p_obj, psz_name, i_val );
2595             break;
2596         case VLC_VAR_INTEGER:
2597             var_SetInteger( p_obj, psz_name, i_val );
2598             break;
2599         case VLC_VAR_VOID:
2600             break;
2601         default:
2602             msg_Warn( p_obj, "FIXME: %s %s %d", __FILE__, __func__,
2603                       __LINE__ );
2604             break;
2605     }
2606
2607     if( b_demux )
2608         var_AddCallback( p_obj, psz_name,
2609                         DemuxControlCallback, (void*)(intptr_t)queryctrl.id );
2610     else
2611         var_AddCallback( p_obj, psz_name,
2612                         AccessControlCallback, (void*)(intptr_t)queryctrl.id );
2613
2614     free( psz_name );
2615 }
2616
2617 /*****************************************************************************
2618  * List all user-class v4l2 controls, set them to the user specified
2619  * value and create the relevant variables to enable runtime changes
2620  *****************************************************************************/
2621 static int ControlList( vlc_object_t *p_obj, int i_fd,
2622                         bool b_reset, bool b_demux )
2623 {
2624     struct v4l2_queryctrl queryctrl;
2625     int i_cid;
2626
2627     memset( &queryctrl, 0, sizeof( queryctrl ) );
2628
2629     /* A list of available controls (aka the variable name) will be
2630      * stored as choices in the "allcontrols" variable. We'll thus be able
2631      * to use those to create an appropriate interface
2632      * A list of available controls that can be changed mid-stream will
2633      * be stored in the "controls" variable */
2634     var_Create( p_obj, "controls", VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
2635     var_Create( p_obj, "allcontrols", VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
2636
2637     var_Create( p_obj, "controls-update", VLC_VAR_VOID | VLC_VAR_ISCOMMAND );
2638
2639     /* Add a control to reset all controls to their default values */
2640     vlc_value_t val, val2;
2641     var_Create( p_obj, "controls-reset", VLC_VAR_VOID | VLC_VAR_ISCOMMAND );
2642     val.psz_string = _( "Reset controls to default" );
2643     var_Change( p_obj, "controls-reset", VLC_VAR_SETTEXT, &val, NULL );
2644     val.i_int = -1;
2645     val2.psz_string = (char *)"controls-reset";
2646     var_Change( p_obj, "controls", VLC_VAR_ADDCHOICE, &val, &val2 );
2647     if (b_demux)
2648         var_AddCallback( p_obj, "controls-reset", DemuxControlResetCallback, NULL );
2649     else
2650         var_AddCallback( p_obj, "controls-reset", AccessControlResetCallback, NULL );
2651
2652     queryctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
2653     if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2654     {
2655         msg_Dbg( p_obj, "Extended control API supported by v4l2 driver" );
2656
2657         /* List extended controls */
2658         queryctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
2659         while( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2660         {
2661             if( queryctrl.type == V4L2_CTRL_TYPE_CTRL_CLASS )
2662             {
2663                 msg_Dbg( p_obj, "%s", queryctrl.name );
2664                 queryctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
2665                 continue;
2666             }
2667             switch( V4L2_CTRL_ID2CLASS( queryctrl.id ) )
2668             {
2669                 case V4L2_CTRL_CLASS_USER:
2670                     msg_Dbg( p_obj, "Available control: %s (%x)",
2671                              queryctrl.name, queryctrl.id );
2672                     break;
2673                 case V4L2_CTRL_CLASS_MPEG:
2674                     name2var( queryctrl.name );
2675                     msg_Dbg( p_obj, "Available MPEG control: %s (%x)",
2676                              queryctrl.name, queryctrl.id );
2677                     break;
2678                 default:
2679                     msg_Dbg( p_obj, "Available private control: %s (%x)",
2680                              queryctrl.name, queryctrl.id );
2681                     break;
2682             }
2683             ControlListPrint( p_obj, i_fd, queryctrl, b_reset, b_demux );
2684             queryctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
2685         }
2686     }
2687     else
2688     {
2689         msg_Dbg( p_obj, "Extended control API not supported by v4l2 driver" );
2690
2691         /* List public controls */
2692         for( i_cid = V4L2_CID_BASE;
2693              i_cid < V4L2_CID_LASTP1;
2694              i_cid ++ )
2695         {
2696             queryctrl.id = i_cid;
2697             if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2698             {
2699                 if( queryctrl.flags & V4L2_CTRL_FLAG_DISABLED )
2700                     continue;
2701                 msg_Dbg( p_obj, "Available control: %s (%x)",
2702                          queryctrl.name, queryctrl.id );
2703                 ControlListPrint( p_obj, i_fd, queryctrl, b_reset, b_demux );
2704             }
2705         }
2706
2707         /* List private controls */
2708         for( i_cid = V4L2_CID_PRIVATE_BASE;
2709              ;
2710              i_cid ++ )
2711         {
2712             queryctrl.id = i_cid;
2713             if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2714             {
2715                 if( queryctrl.flags & V4L2_CTRL_FLAG_DISABLED )
2716                     continue;
2717                 msg_Dbg( p_obj, "Available private control: %s (%x)",
2718                          queryctrl.name, queryctrl.id );
2719                 ControlListPrint( p_obj, i_fd, queryctrl, b_reset, b_demux );
2720             }
2721             else
2722                 break;
2723         }
2724     }
2725
2726     return VLC_SUCCESS;
2727 }
2728
2729 static void SetAvailControlsByString( vlc_object_t *p_obj, demux_sys_t *p_sys,
2730                                       int i_fd )
2731 {
2732     char *psz_parser = p_sys->psz_set_ctrls;
2733     vlc_value_t val, text, name;
2734
2735     if( psz_parser == NULL )
2736         return;
2737
2738     if( *psz_parser == '{' )
2739         psz_parser++;
2740
2741     int i_ret = var_Change( p_obj, "allcontrols", VLC_VAR_GETCHOICES,
2742                             &val, &text );
2743     if( i_ret < 0 )
2744     {
2745         msg_Err( p_obj, "Oops, can't find 'allcontrols' variable." );
2746         return;
2747     }
2748
2749     while( *psz_parser && *psz_parser != '}' )
2750     {
2751         char *psz_delim, *psz_assign;
2752
2753         while( *psz_parser == ',' || *psz_parser == ' ' )
2754             psz_parser++;
2755
2756         psz_delim = strchr( psz_parser, ',' );
2757         if( psz_delim == NULL )
2758             psz_delim = strchr( psz_parser, '}' );
2759         if( psz_delim == NULL )
2760             psz_delim = psz_parser + strlen( psz_parser );
2761
2762         psz_assign = memchr( psz_parser, '=', psz_delim - psz_parser );
2763         if( psz_assign == NULL )
2764         {
2765             char *psz_name = strndup( psz_parser, psz_delim - psz_parser );
2766             msg_Err( p_obj, "%s missing '='", psz_name );
2767             free( psz_name );
2768             psz_parser = psz_delim + 1;
2769             continue;
2770         }
2771
2772         for( int i = 0;
2773              i < val.p_list->i_count ;//&& psz_parser < psz_assign;
2774              i++ )
2775         {
2776             const char *psz_var = text.p_list->p_values[i].psz_string;
2777             int i_cid = val.p_list->p_values[i].i_int;
2778             var_Change( p_obj, psz_var, VLC_VAR_GETTEXT, &name, NULL );
2779             const char *psz_name = name.psz_string;
2780
2781             int i_availstrlen = strlen( psz_name );
2782             int i_parsestrlen = psz_assign - psz_parser;
2783             int i_maxstrlen = __MAX( i_availstrlen, i_parsestrlen);
2784
2785             if( !strncasecmp( psz_name, psz_parser, i_maxstrlen ) )
2786             {
2787                 Control( p_obj, i_fd, psz_name, i_cid,
2788                          strtol( ++psz_assign, &psz_parser, 0) );
2789             }
2790         }
2791
2792         if( psz_parser < psz_assign )
2793         {
2794             char *psz_name = strndup( psz_parser, psz_assign - psz_parser );
2795             msg_Err( p_obj, "Control %s not available", psz_name );
2796             free( psz_name );
2797             psz_parser = ( *psz_delim ) ? ( psz_delim + 1 ) : psz_delim;
2798         }
2799     }
2800 }
2801
2802 /*****************************************************************************
2803  * Reset all user-class v4l2 controls to their default value
2804  *****************************************************************************/
2805 static int ControlReset( vlc_object_t *p_obj, int i_fd )
2806 {
2807     struct v4l2_queryctrl queryctrl;
2808     int i_cid;
2809     memset( &queryctrl, 0, sizeof( queryctrl ) );
2810
2811     queryctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
2812     if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2813     {
2814         /* Extended control API supported */
2815         queryctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
2816         while( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2817         {
2818             if( queryctrl.type == V4L2_CTRL_TYPE_CTRL_CLASS
2819              || V4L2_CTRL_ID2CLASS( queryctrl.id ) == V4L2_CTRL_CLASS_MPEG )
2820             {
2821                 queryctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
2822                 continue;
2823             }
2824             struct v4l2_control control;
2825             memset( &control, 0, sizeof( control ) );
2826             control.id = queryctrl.id;
2827             if( v4l2_ioctl( i_fd, VIDIOC_G_CTRL, &control ) >= 0
2828              && queryctrl.default_value != control.value )
2829             {
2830                 int i;
2831                 for( i = 0; controls[i].psz_name != NULL; i++ )
2832                     if( controls[i].i_cid == queryctrl.id ) break;
2833                 name2var( queryctrl.name );
2834                 Control( p_obj, i_fd,
2835                          controls[i].psz_name ? : (const char *)queryctrl.name,
2836                          queryctrl.id, queryctrl.default_value );
2837             }
2838             queryctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
2839         }
2840     }
2841     else
2842     {
2843
2844         /* public controls */
2845         for( i_cid = V4L2_CID_BASE;
2846              i_cid < V4L2_CID_LASTP1;
2847              i_cid ++ )
2848         {
2849             queryctrl.id = i_cid;
2850             if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2851             {
2852                 struct v4l2_control control;
2853                 if( queryctrl.flags & V4L2_CTRL_FLAG_DISABLED )
2854                     continue;
2855                 memset( &control, 0, sizeof( control ) );
2856                 control.id = queryctrl.id;
2857                 if( v4l2_ioctl( i_fd, VIDIOC_G_CTRL, &control ) >= 0
2858                  && queryctrl.default_value != control.value )
2859                 {
2860                     int i;
2861                     for( i = 0; controls[i].psz_name != NULL; i++ )
2862                         if( controls[i].i_cid == queryctrl.id ) break;
2863                     name2var( queryctrl.name );
2864                     Control( p_obj, i_fd,
2865                              controls[i].psz_name ? : (const char *)queryctrl.name,
2866                              queryctrl.id, queryctrl.default_value );
2867                 }
2868             }
2869         }
2870
2871         /* private controls */
2872         for( i_cid = V4L2_CID_PRIVATE_BASE;
2873              ;
2874              i_cid ++ )
2875         {
2876             queryctrl.id = i_cid;
2877             if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) >= 0 )
2878             {
2879                 struct v4l2_control control;
2880                 if( queryctrl.flags & V4L2_CTRL_FLAG_DISABLED )
2881                     continue;
2882                 memset( &control, 0, sizeof( control ) );
2883                 control.id = queryctrl.id;
2884                 if( v4l2_ioctl( i_fd, VIDIOC_G_CTRL, &control ) >= 0
2885                  && queryctrl.default_value != control.value )
2886                 {
2887                     name2var( queryctrl.name );
2888                     Control( p_obj, i_fd, (const char *)queryctrl.name,
2889                              queryctrl.id, queryctrl.default_value );
2890                 }
2891             }
2892             else
2893                 break;
2894         }
2895     }
2896     return VLC_SUCCESS;
2897 }
2898
2899 /*****************************************************************************
2900  * Issue user-class v4l2 controls
2901  *****************************************************************************/
2902 static int Control( vlc_object_t *p_obj, int i_fd,
2903                     const char *psz_name, int i_cid, int i_value )
2904 {
2905     struct v4l2_queryctrl queryctrl;
2906     struct v4l2_control control;
2907     struct v4l2_ext_control ext_control;
2908     struct v4l2_ext_controls ext_controls;
2909
2910     if( i_value == -1 )
2911         return VLC_SUCCESS;
2912
2913     memset( &queryctrl, 0, sizeof( queryctrl ) );
2914
2915     queryctrl.id = i_cid;
2916
2917     if( v4l2_ioctl( i_fd, VIDIOC_QUERYCTRL, &queryctrl ) < 0
2918         || queryctrl.flags & V4L2_CTRL_FLAG_DISABLED )
2919     {
2920         msg_Dbg( p_obj, "%s (%x) control is not supported.", psz_name, i_cid );
2921         return VLC_EGENERIC;
2922     }
2923
2924     memset( &control, 0, sizeof( control ) );
2925     memset( &ext_control, 0, sizeof( ext_control ) );
2926     memset( &ext_controls, 0, sizeof( ext_controls ) );
2927     control.id = i_cid;
2928     ext_control.id = i_cid;
2929     ext_controls.ctrl_class = V4L2_CTRL_ID2CLASS( i_cid );
2930     ext_controls.count = 1;
2931     ext_controls.controls = &ext_control;
2932
2933     int i_ret = -1;
2934
2935     if( i_value >= 0 )
2936     {
2937         ext_control.value = i_value;
2938         if( v4l2_ioctl( i_fd, VIDIOC_S_EXT_CTRLS, &ext_controls ) < 0 )
2939         {
2940             control.value = i_value;
2941             if( v4l2_ioctl( i_fd, VIDIOC_S_CTRL, &control ) < 0 )
2942             {
2943                 msg_Err( p_obj, "unable to set %s (%x) to %d (%m)",
2944                          psz_name, i_cid, i_value );
2945                 return VLC_EGENERIC;
2946             }
2947             i_ret = v4l2_ioctl( i_fd, VIDIOC_G_CTRL, &control );
2948         }
2949         else
2950         {
2951             i_ret = v4l2_ioctl( i_fd, VIDIOC_G_EXT_CTRLS, &ext_controls );
2952             control.value = ext_control.value;
2953         }
2954     }
2955
2956     if( i_ret >= 0 )
2957     {
2958         vlc_value_t val;
2959         msg_Dbg( p_obj, "video %s: %d", psz_name, control.value );
2960         switch( var_Type( p_obj, psz_name ) & VLC_VAR_TYPE )
2961         {
2962             case VLC_VAR_BOOL:
2963                 val.b_bool = control.value;
2964                 var_Change( p_obj, psz_name, VLC_VAR_SETVALUE, &val, NULL );
2965                 var_SetVoid( p_obj, "controls-update" );
2966                 break;
2967             case VLC_VAR_INTEGER:
2968                 val.i_int = control.value;
2969                 var_Change( p_obj, psz_name, VLC_VAR_SETVALUE, &val, NULL );
2970                 var_SetVoid( p_obj, "controls-update" );
2971                 break;
2972         }
2973     }
2974     return VLC_SUCCESS;
2975 }
2976
2977 /*****************************************************************************
2978  * On the fly change settings callback
2979  *****************************************************************************/
2980 static int DemuxControlCallback( vlc_object_t *p_this,
2981     const char *psz_var, vlc_value_t oldval, vlc_value_t newval,
2982     void *p_data )
2983 {
2984     (void)oldval;
2985     demux_t *p_demux = (demux_t*)p_this;
2986     demux_sys_t *p_sys = p_demux->p_sys;
2987     int i_cid = (long int)p_data;
2988
2989     int i_fd = p_sys->i_fd;
2990
2991     if( i_fd < 0 )
2992         return VLC_EGENERIC;
2993
2994     Control( p_this, i_fd, psz_var, i_cid, newval.i_int );
2995
2996     return VLC_EGENERIC;
2997 }
2998
2999 static int DemuxControlResetCallback( vlc_object_t *p_this,
3000     const char *psz_var, vlc_value_t oldval, vlc_value_t newval, void *p_data )
3001 {
3002     (void)psz_var;    (void)oldval;    (void)newval;    (void)p_data;
3003     demux_t *p_demux = (demux_t*)p_this;
3004     demux_sys_t *p_sys = p_demux->p_sys;
3005
3006     int i_fd = p_sys->i_fd;
3007
3008     if( i_fd < 0 )
3009         return VLC_EGENERIC;
3010
3011     ControlReset( p_this, i_fd );
3012
3013     return VLC_EGENERIC;
3014 }
3015
3016 static int AccessControlCallback( vlc_object_t *p_this,
3017     const char *psz_var, vlc_value_t oldval, vlc_value_t newval,
3018     void *p_data )
3019 {
3020     (void)oldval;
3021     access_t *p_access = (access_t *)p_this;
3022     demux_sys_t *p_sys = (demux_sys_t *) p_access->p_sys;
3023     int i_cid = (long int)p_data;
3024
3025     int i_fd = p_sys->i_fd;
3026
3027     if( i_fd < 0 )
3028         return VLC_EGENERIC;
3029
3030     Control( p_this, i_fd, psz_var, i_cid, newval.i_int );
3031
3032     return VLC_EGENERIC;
3033 }
3034
3035 static int AccessControlResetCallback( vlc_object_t *p_this,
3036     const char *psz_var, vlc_value_t oldval, vlc_value_t newval, void *p_data )
3037 {
3038     (void)psz_var;     (void)oldval;     (void)newval;     (void)p_data;
3039     access_t *p_access = (access_t *)p_this;
3040     demux_sys_t *p_sys = (demux_sys_t *) p_access->p_sys;
3041
3042     int i_fd = p_sys->i_fd;
3043
3044     if( i_fd < 0 )
3045         return VLC_EGENERIC;
3046
3047     ControlReset( p_this, i_fd );
3048
3049     return VLC_EGENERIC;
3050 }