include/vlc_osd.h

   1 /*****************************************************************************
   2  * vlc_osd.h - OSD menu and subpictures definitions and function prototypes
   3  *****************************************************************************
   4  * Copyright (C) 1999-2006 the VideoLAN team
   5  * Copyright (C) 2004-2005 M2X
   6  * $Id$
   7  *
   8  * Authors: Jean-Paul Saman <jpsaman #_at_# m2x dot nl>
   9  *          Gildas Bazin <gbazin@videolan.org>
  10  *
  11  * Added code from include/osd.h written by:
  12  * Copyright (C) 2003-2005 the VideoLAN team
  13  * Authors: Sigmund Augdal Helberg <dnumgis@videolan.org>
  14  *
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2 of the License, or
  18  * (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  28  *****************************************************************************/
  29
  30 #ifndef VLC_OSD_H
  31 #define VLC_OSD_H 1
  32
  33 #include <vlc_vout.h>
  34 #include <vlc_spu.h>
  35 #include <vlc_vout_osd.h>
  36
  37 # ifdef __cplusplus
  38 extern "C" {
  39 # endif
  40
  41 /**
  42  * \file
  43  * This file defines SPU subpicture and OSD functions and object types.
  44  */
  45
  46 /**********************************************************************
  47  * OSD Menu
  48  **********************************************************************/
  49 /**
  50  * \defgroup osdmenu OSD Menu
  51  * The OSD menu core creates the OSD menu structure in memory. It parses a
  52  * configuration file that defines all elements that are part of the menu. The
  53  * core also handles all actions and menu structure updates on behalf of video
  54  * subpicture filters.
  55  *
  56  * The file modules/video_filters/osdmenu.c implements a subpicture filter that
  57  * specifies the final information on positioning of the current state image.
  58  * A subpicture filter is called each time a video picture has to be rendered,
  59  * it also gives a start and end date to the subpicture. The subpicture can be
  60  * streamed if used inside a transcoding command. For example:
  61  *
  62  *  vlc dvdsimple:///dev/dvd --extraintf rc
  63  *  --sout='#transcode{osd}:std{access=udp,mux=ts,dst=dest_ipaddr}'
  64  *  --osdmenu-file=share/osdmenu/dvd.cfg
  65  *
  66  * An example for local usage of the OSD menu is:
  67  *
  68  *  vlc dvdsimple:///dev/dvd --extraintf rc
  69  *  --sub-filter osdmenu
  70  *  --osdmenu-file=share/osdmenu/dvd.cfg
  71  *
  72  * Each OSD menu element, called "action", defines a hotkey action. Each action
  73  * can have several states (unselect, select, pressed). Each state has an image
  74  * that represents the state visually. The commands "menu right", "menu left",
  75  * "menu up" and "menu down" are used to navigate through the OSD menu structure.
  76  * The commands "menu on" or "menu show" and "menu off" or "menu hide" respectively
  77  * show and hide the OSD menu subpictures.
  78  *
  79  * There is one special element called "range". A range is an arbritary range
  80  * of state images that can be browsed using "menu up" and "menu down" commands
  81  * on the rc interface.
  82  *
  83  * The OSD menu configuration file uses a very simple syntax and basic parser.
  84  * A configuration file has the ".cfg".
  85  * An example is "share/osdmenu/dvd256.cfg".
  86  * @{
  87  */
  88
  89 /**
  90  * \brief The OSD Menu configuration file format.
  91  *
  92  * The configuration file syntax is very basic and so is its parser. See the
  93  * BNF formal representation below:
  94  *
  95  * The keywords FILENAME and PATHNAME represent the filename and pathname
  96  * specification that is valid for the Operating System VLC is compiled for.
  97  *
  98  * The hotkey actions that are supported by VLC are documented in the file
  99  * src/libvlc. The file include/vlc_keys.h defines some hotkey internals.
 100  *
 101  * CONFIG_FILE = FILENAME '.cfg'
 102  * WS = [ ' ' | '\t' ]+
 103  * OSDMENU_PATH = PATHNAME
 104  * DIR = 'dir' WS OSDMENU_PATH '\n'
 105  * STYLE = 'style' [ 'default' | 'concat' ] '\n'
 106  * STATE = [ 'unselect' | 'select' | 'pressed' ]
 107  * HOTKEY_ACTION = 'key-' [ 'a' .. 'z', 'A' .. 'Z', '-' ]+
 108  *
 109  * ACTION_TYPE        = 'type' 'volume' '\n'
 110  * ACTION_BLOCK_START = 'action' WS HOTKEY_ACTION WS '('POS','POS')' '\n'
 111  * ACTION_BLOCK_END   = 'end' '\n'
 112  * ACTION_STATE       = STATE WS FILENAME '\n'
 113  * ACTION_RANGE_START = 'range' WS HOTKEY_ACTION WS DEFAULT_INDEX '\n'
 114  * ACTION_RANGE_END   = 'end' '\n'
 115  * ACTION_RANGE_STATE = FILENAME '\n'
 116  *
 117  * ACTION_BLOCK_RANGE = ACTION_RANGE_START [WS ACTION_RANGE_STATE]+ WS ACTION_RANGE_END
 118  * ACTION_BLOCK = ACTION_BLOCK_START [WS ACTION_TYPE*] [ [WS ACTION_STATE]+3 | [WS ACTION_BLOCK_RANGE]+1 ] ACTION_BLOCK_END
 119  * CONFIG_FILE_CONTENTS = DIR [ACTION_BLOCK]+
 120  *
 121  */
 122
 123 /**
 124  * OSD menu button states
 125  *
 126  * Every button has three states, either it is unselected, selected or pressed.
 127  * An OSD menu skin can associate images with each state.
 128  *
 129  *  OSD_BUTTON_UNSELECT 0
 130  *  OSD_BUTTON_SELECT   1
 131  *  OSD_BUTTON_PRESSED  2
 132  */
 133 #define OSD_BUTTON_UNSELECT 0
 134 #define OSD_BUTTON_SELECT   1
 135 #define OSD_BUTTON_PRESSED  2
 136
 137 /**
 138  * OSD State object
 139  *
 140  * The OSD state object holds the state and associated images for a
 141  * particular state on the screen. The picture is displayed when this
 142  * state is the active state.
 143  */
 144 struct osd_state_t
 145 {
 146     osd_state_t *p_next;    /*< pointer to next state */
 147     osd_state_t *p_prev;    /*< pointer to previous state */
 148     picture_t   *p_pic;     /*< picture of state */
 149
 150     char        *psz_state; /*< state name */
 151     int          i_state;   /*< state index */
 152
 153     int     i_x;            /*< x-position of button state image */
 154     int     i_y;            /*< y-position of button state image */
 155     int     i_width;        /*< width of button state image */
 156     int     i_height;       /*< height of button state image */
 157 };
 158
 159 /**
 160  * OSD Button object
 161  *
 162  * An OSD Button has different states. Each state has an image for display.
 163  */
 164 struct osd_button_t
 165 {
 166     osd_button_t *p_next;   /*< pointer to next button */
 167     osd_button_t *p_prev;   /*< pointer to previous button */
 168     osd_button_t *p_up;     /*< pointer to up button */
 169     osd_button_t *p_down;   /*< pointer to down button */
 170
 171     osd_state_t *p_current_state; /*< pointer to current state image */
 172     osd_state_t *p_states; /*< doubly linked list of states */
 173     picture_t   *p_feedback; /*< feedback picture */
 174
 175     char    *psz_name;     /*< name of button */
 176
 177     /* These member should probably be a struct hotkey */
 178     char    *psz_action;      /*< hotkey action name on button*/
 179     char    *psz_action_down; /*< hotkey action name on range buttons
 180                                   for command "menu down" */
 181     /* end of hotkey specifics */
 182
 183     int     i_x;            /*< x-position of button visible state image */
 184     int     i_y;            /*< y-position of button visible state image */
 185     int     i_width;        /*< width of button visible state image */
 186     int     i_height;       /*< height of button visible state image */
 187
 188     /* range style button */
 189     bool   b_range;    /*< button should be interpreted as range */
 190     int          i_ranges;   /*< number of states */
 191 };
 192
 193 /**
 194  * OSD Menu Style
 195  *
 196  * The images that make up an OSD menu can be created in such away that
 197  * they contain all buttons in the same picture, with the selected one
 198  * highlighted or being a concatenation of all the separate images. The
 199  * first case is the default.
 200  *
 201  * To change the default style the keyword 'style' should be set to 'concat'.
 202  */
 203
 204 #define OSD_MENU_STYLE_SIMPLE 0x0
 205 #define OSD_MENU_STYLE_CONCAT 0x1
 206
 207 /**
 208  * OSD Menu State object
 209  *
 210  * Represents the current state as displayed.
 211  */
 212 /* Represent the menu state */
 213 struct osd_menu_state_t
 214 {
 215     int     i_x;        /*< x position of spu region */
 216     int     i_y;        /*< y position of spu region */
 217     int     i_width;    /*< width of spu region */
 218     int     i_height;   /*< height of spu region */
 219
 220     picture_t    *p_pic;  /*< pointer to picture to display */
 221     osd_button_t *p_visible; /*< shortcut to visible button */
 222
 223     bool b_menu_visible; /*< menu currently visible? */
 224     bool b_update;       /*< update OSD Menu when true */
 225
 226     /* quick hack to volume state. */
 227     osd_button_t *p_volume; /*< pointer to volume range object. */
 228 };
 229
 230 /**
 231  * OSD Menu object
 232  *
 233  * The main OSD Menu object, which holds a linked list to all buttons
 234  * and images that defines the menu. The p_state variable represents the
 235  * current state of the OSD Menu.
 236  */
 237 struct osd_menu_t
 238 {
 239     VLC_COMMON_MEMBERS
 240
 241     int     i_x;        /*< x-position of OSD Menu on the video screen */
 242     int     i_y;        /*< y-position of OSD Menu on the video screen */
 243     int     i_width;    /*< width of OSD Menu on the video screen */
 244     int     i_height;   /*< height of OSD Menu on the video screen */
 245     int     i_style;    /*< style of spu region generation */
 246     int     i_position; /*< display position */
 247
 248     char             *psz_path;  /*< directory where OSD menu images are stored */
 249     osd_button_t     *p_button;  /*< doubly linked list of buttons */
 250     osd_menu_state_t *p_state;   /*< current state of OSD menu */
 251
 252     /* quick link in the linked list. */
 253     osd_button_t  *p_last_button; /*< pointer to last button in the list */
 254
 255     /* misc parser */
 256     module_t        *p_parser;  /*< pointer to parser module */
 257     char            *psz_file;  /*< Config file name */
 258     image_handler_t *p_image;   /*< handler to image loading and conversion libraries */
 259 };
 260
 261 /**
 262  * Initialize an osd_menu_t object
 263  *
 264  * This functions has to be called before any call to other osd_menu_t*
 265  * functions. It creates the osd_menu object and holds a pointer to it
 266  * during its lifetime.
 267  */
 268 VLC_EXPORT( osd_menu_t *, osd_MenuCreate, ( vlc_object_t *, const char * ) LIBVLC_USED );
 269
 270 /**
 271  * Delete the osd_menu_t object
 272  *
 273  * This functions has to be called to release the associated module and
 274  * memory for the osdmenu. After return of this function the pointer to
 275  * osd_menu_t* is invalid.
 276  */
 277 VLC_EXPORT( void, osd_MenuDelete, ( vlc_object_t *, osd_menu_t * ) );
 278
 279 #define osd_MenuCreate(object,file) osd_MenuCreate( VLC_OBJECT(object), file )
 280 #define osd_MenuDelete(object,osd)  osd_MenuDelete( VLC_OBJECT(object), osd )
 281
 282 /**
 283  * Find OSD Menu button at position x,y
 284  */
 285 VLC_EXPORT( osd_button_t *, osd_ButtonFind, ( vlc_object_t *p_this,
 286      int, int, int, int, int, int ) LIBVLC_USED );
 287
 288 #define osd_ButtonFind(object,x,y,h,w,sh,sw)  osd_ButtonFind(object,x,y,h,w,sh,sw)
 289
 290 /**
 291  * Select the button provided as the new active button
 292  */
 293 VLC_EXPORT( void, osd_ButtonSelect, ( vlc_object_t *, osd_button_t *) );
 294
 295 #define osd_ButtonSelect(object,button) osd_ButtonSelect(object,button)
 296
 297 /**
 298  * Show the OSD menu.
 299  *
 300  * Show the OSD menu on the video output or mux it into the stream.
 301  * Every change to the OSD menu will now be visible in the output. An output
 302  * can be a video output window or a stream (\see stream output)
 303  */
 304 VLC_EXPORT( void, osd_MenuShow, ( vlc_object_t * ) );
 305
 306 /**
 307  * Hide the OSD menu.
 308  *
 309  * Stop showing the OSD menu on the video output or mux it into the stream.
 310  */
 311 VLC_EXPORT( void, osd_MenuHide, ( vlc_object_t * ) );
 312
 313 /**
 314  * Activate the action of this OSD menu item.
 315  *
 316  * The rc interface command "menu select" triggers the sending of an
 317  * hotkey action to the hotkey interface. The hotkey that belongs to
 318  * the current highlighted OSD menu item will be used.
 319  */
 320 VLC_EXPORT( void, osd_MenuActivate,   ( vlc_object_t * ) );
 321
 322 #define osd_MenuShow(object) osd_MenuShow( VLC_OBJECT(object) )
 323 #define osd_MenuHide(object) osd_MenuHide( VLC_OBJECT(object) )
 324 #define osd_MenuActivate(object)   osd_MenuActivate( VLC_OBJECT(object) )
 325
 326 /**
 327  * Next OSD menu item
 328  *
 329  * Select the next OSD menu item to be highlighted.
 330  * Note: The actual position on screen of the menu item is determined by
 331  * the OSD menu configuration file.
 332  */
 333 VLC_EXPORT( void, osd_MenuNext, ( vlc_object_t * ) );
 334
 335 /**
 336  * Previous OSD menu item
 337  *
 338  * Select the previous OSD menu item to be highlighted.
 339  * Note: The actual position on screen of the menu item is determined by
 340  * the OSD menu configuration file.
 341  */
 342 VLC_EXPORT( void, osd_MenuPrev, ( vlc_object_t * ) );
 343
 344 /**
 345  * OSD menu item above
 346  *
 347  * Select the OSD menu item above the current item to be highlighted.
 348  * Note: The actual position on screen of the menu item is determined by
 349  * the OSD menu configuration file.
 350  */
 351 VLC_EXPORT( void, osd_MenuUp,   ( vlc_object_t * ) );
 352
 353 /**
 354  * OSD menu item below
 355  *
 356  * Select the next OSD menu item below the current item to be highlighted.
 357  * Note: The actual position on screen of the menu item is determined by
 358  * the OSD menu configuration file.
 359  */
 360 VLC_EXPORT( void, osd_MenuDown, ( vlc_object_t * ) );
 361
 362 #define osd_MenuNext(object) osd_MenuNext( VLC_OBJECT(object) )
 363 #define osd_MenuPrev(object) osd_MenuPrev( VLC_OBJECT(object) )
 364 #define osd_MenuUp(object)   osd_MenuUp( VLC_OBJECT(object) )
 365 #define osd_MenuDown(object) osd_MenuDown( VLC_OBJECT(object) )
 366
 367 /**
 368  * Display the audio volume bitmap.
 369  *
 370  * Display the correct audio volume bitmap that corresponds to the
 371  * current Audio Volume setting.
 372  */
 373 VLC_EXPORT( void, osd_Volume, ( vlc_object_t * ) );
 374
 375 #define osd_Volume(object)     osd_Volume( VLC_OBJECT(object) )
 376
 377 /**
 378  * Retrieve a non modifyable pointer to the OSD Menu state
 379  *
 380  */
 381 LIBVLC_USED
 382 static inline const osd_menu_state_t *osd_GetMenuState( osd_menu_t *p_osd )
 383 {
 384     return( p_osd->p_state );
 385 }
 386
 387 /**
 388  * Get the last key press received by the OSD Menu
 389  *
 390  * Returns 0 when no key has been pressed or the value of the key pressed.
 391  */
 392 LIBVLC_USED
 393 static inline bool osd_GetKeyPressed( osd_menu_t *p_osd )
 394 {
 395     return( p_osd->p_state->b_update );
 396 }
 397
 398 /**
 399  * Set the key pressed to a value.
 400  *
 401  * Assign a new key value to the last key pressed on the OSD Menu.
 402  */
 403 static inline void osd_SetKeyPressed( vlc_object_t *p_this, int i_value )
 404 {
 405     vlc_value_t val;
 406
 407     val.i_int = i_value;
 408     var_Set( p_this, "key-pressed", val );
 409 }
 410
 411 /**
 412  * Update the OSD Menu visibility flag.
 413  *
 414  * true means OSD Menu should be shown. false means OSD Menu
 415  * should not be shown.
 416  */
 417 static inline void osd_SetMenuVisible( osd_menu_t *p_osd, bool b_value )
 418 {
 419     vlc_value_t val;
 420
 421     val.b_bool = p_osd->p_state->b_menu_visible = b_value;
 422     var_Set( p_osd, "osd-menu-visible", val );
 423 }
 424
 425 /**
 426  * Update the OSD Menu update flag
 427  *
 428  * If the OSD Menu should be updated then set the update flag to
 429  * true, else to false.
 430  */
 431 static inline void osd_SetMenuUpdate( osd_menu_t *p_osd, bool b_value )
 432 {
 433     vlc_value_t val;
 434
 435     val.b_bool = p_osd->p_state->b_update = b_value;
 436     var_Set( p_osd, "osd-menu-update", val );
 437 }
 438
 439 /**
 440  * Textual feedback
 441  *
 442  * Functions that provide the textual feedback on the OSD. They are shown
 443  * on hotkey commands. The feedback is also part of the osd_button_t
 444  * object. The types are declared in the include file include/vlc_osd.h
 445  * @see vlc_osd.h
 446  */
 447 VLC_EXPORT( int, osd_ShowTextRelative, ( spu_t *, int, const char *, const text_style_t *, int, int, int, mtime_t ) );
 448 VLC_EXPORT( int, osd_ShowTextAbsolute, ( spu_t *, int, const char *, const text_style_t *, int, int, int, mtime_t, mtime_t ) );
 449 VLC_EXPORT( void, osd_Message, ( spu_t *, int, char *, ... ) LIBVLC_FORMAT( 3, 4 ) );
 450
 451 /** @} */
 452
 453 # ifdef __cplusplus
 454 }
 455 # endif
 456
 457 #endif /* _VLC_OSD_H */