include/vlc_vout_display.h

   1 /*****************************************************************************
   2  * vlc_vout_display.h: vout_display_t definitions
   3  *****************************************************************************
   4  * Copyright (C) 2009 Laurent Aimar
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 #ifndef VLC_VOUT_DISPLAY_H
  25 #define VLC_VOUT_DISPLAY_H 1
  26
  27 /**
  28  * \file
  29  * This file defines vout display structures and functions in vlc
  30  */
  31
  32 #include <vlc_es.h>
  33 #include <vlc_picture.h>
  34 #include <vlc_picture_pool.h>
  35 #include <vlc_subpicture.h>
  36 #include <vlc_keys.h>
  37 #include <vlc_mouse.h>
  38 #include <vlc_vout_window.h>
  39
  40 /* XXX
  41  * Do NOT use video_format_t::i_aspect but i_sar_num/den everywhere. i_aspect
  42  * will be removed as soon as possible.
  43  *
  44  */
  45 typedef struct vout_display_t vout_display_t;
  46 typedef struct vout_display_sys_t vout_display_sys_t;
  47 typedef struct vout_display_owner_t vout_display_owner_t;
  48 typedef struct vout_display_owner_sys_t vout_display_owner_sys_t;
  49
  50 /**
  51  * Possible alignments for vout_display.
  52  */
  53 typedef enum
  54 {
  55     VOUT_DISPLAY_ALIGN_CENTER,
  56     /* */
  57     VOUT_DISPLAY_ALIGN_LEFT,
  58     VOUT_DISPLAY_ALIGN_RIGHT,
  59     /* */
  60     VOUT_DISPLAY_ALIGN_TOP,
  61     VOUT_DISPLAY_ALIGN_BOTTOM,
  62 } vout_display_align_t;
  63
  64 /**
  65  * Window management state.
  66  */
  67 enum {
  68     VOUT_WINDOW_STATE_NORMAL=0,
  69     VOUT_WINDOW_STATE_ABOVE=1,
  70     VOUT_WINDOW_STATE_BELOW=2,
  71     VOUT_WINDOW_STACK_MASK=3,
  72 };
  73
  74 /**
  75  * Initial/Current configuration for a vout_display_t
  76  */
  77 typedef struct {
  78     bool is_fullscreen;  /* Is the display fullscreen */
  79
  80     /* Display properties */
  81     struct {
  82         /* Window title (may be NULL) */
  83         const char *title;
  84
  85         /* Display size */
  86         unsigned  width;
  87         unsigned  height;
  88
  89         /* Display SAR */
  90         struct {
  91             unsigned num;
  92             unsigned den;
  93         } sar;
  94     } display;
  95
  96     /* Alignment of the picture inside the display */
  97     struct {
  98         int horizontal;
  99         int vertical;
 100     } align;
 101
 102     /* Do we fill up the display with the video */
 103     bool is_display_filled;
 104
 105     /* Zoom to use
 106      * It will be applied to the whole display if b_display_filled is set, otherwise
 107      * only on the video source */
 108     struct {
 109         int num;
 110         int den;
 111     } zoom;
 112
 113 } vout_display_cfg_t;
 114
 115 /**
 116  * Information from a vout_display_t to configure
 117  * the core behaviour.
 118  *
 119  * By default they are all false or NULL.
 120  *
 121  */
 122 typedef struct {
 123     bool is_slow;                           /* The picture memory has slow read/write */
 124     bool has_double_click;                  /* Is double-click generated */
 125     bool has_hide_mouse;                    /* Is mouse automatically hidden */
 126     bool has_pictures_invalid;              /* Will VOUT_DISPLAY_EVENT_PICTURES_INVALID be used */
 127     bool has_event_thread;                  /* Will events (key at least) be emitted using an independent thread */
 128     const vlc_fourcc_t *subpicture_chromas; /* List of supported chromas for subpicture rendering. */
 129 } vout_display_info_t;
 130
 131 /**
 132  * Control query for vout_display_t
 133  */
 134 enum {
 135     /* Hide the mouse. It will be sent when
 136      * vout_display_t::info.b_hide_mouse is false */
 137     VOUT_DISPLAY_HIDE_MOUSE,
 138
 139     /* Ask to reset the internal buffers after a VOUT_DISPLAY_EVENT_PICTURES_INVALID
 140      * request.
 141      */
 142     VOUT_DISPLAY_RESET_PICTURES,
 143
 144     /* Ask the module to acknowledge/refuse the fullscreen state change after
 145      * being requested (externally or by VOUT_DISPLAY_EVENT_FULLSCREEN */
 146     VOUT_DISPLAY_CHANGE_FULLSCREEN,     /* const vout_display_cfg_t *p_cfg */
 147
 148     /* Ask the module to acknowledge/refuse the window management state change
 149      * after being requested externally or by VOUT_DISPLAY_WINDOW_STATE */
 150     VOUT_DISPLAY_CHANGE_WINDOW_STATE,         /* unsigned state */
 151
 152     /* Ask the module to acknowledge/refuse the display size change requested
 153      * (externally or by VOUT_DISPLAY_EVENT_DISPLAY_SIZE) */
 154     VOUT_DISPLAY_CHANGE_DISPLAY_SIZE,   /* const vout_display_cfg_t *p_cfg, int is_forced */
 155
 156     /* Ask the module to acknowledge/refuse fill display state change after
 157      * being requested externally */
 158     VOUT_DISPLAY_CHANGE_DISPLAY_FILLED, /* const vout_display_cfg_t *p_cfg */
 159
 160     /* Ask the module to acknowledge/refuse zoom change after being requested
 161      * externally */
 162     VOUT_DISPLAY_CHANGE_ZOOM, /* const vout_display_cfg_t *p_cfg */
 163
 164     /* Ask the module to acknowledge/refuse source aspect ratio after being
 165      * requested externally */
 166     VOUT_DISPLAY_CHANGE_SOURCE_ASPECT, /* const video_format_t *p_source */
 167
 168     /* Ask the module to acknowledge/refuse source crop change after being
 169      * requested externally.
 170      * The cropping requested is stored by video_format_t::i_x/y_offset and
 171      * video_format_t::i_visible_width/height */
 172     VOUT_DISPLAY_CHANGE_SOURCE_CROP,   /* const video_format_t *p_source */
 173
 174     /* Ask an opengl interface if available. */
 175     VOUT_DISPLAY_GET_OPENGL,           /* vlc_gl_t ** */
 176 };
 177
 178 /**
 179  * Event from vout_display_t
 180  *
 181  * Events modifiying the state may be sent multiple times.
 182  * Only the transition will be retained and acted upon.
 183  */
 184 enum {
 185     /* TODO:
 186      * ZOOM ? DISPLAY_FILLED ? ON_TOP ?
 187      */
 188     /* */
 189     VOUT_DISPLAY_EVENT_PICTURES_INVALID,    /* The buffer are now invalid and need to be changed */
 190
 191     VOUT_DISPLAY_EVENT_FULLSCREEN,
 192     VOUT_DISPLAY_EVENT_WINDOW_STATE,
 193
 194     VOUT_DISPLAY_EVENT_DISPLAY_SIZE,        /* The display size need to change : int i_width, int i_height, bool is_fullscreen */
 195
 196     /* */
 197     VOUT_DISPLAY_EVENT_CLOSE,
 198     VOUT_DISPLAY_EVENT_KEY,
 199
 200     /* Full mouse state.
 201      * You can use it OR use the other mouse events. The core will do
 202      * the conversion.
 203      */
 204     VOUT_DISPLAY_EVENT_MOUSE_STATE,
 205
 206     /* Mouse event */
 207     VOUT_DISPLAY_EVENT_MOUSE_MOVED,
 208     VOUT_DISPLAY_EVENT_MOUSE_PRESSED,
 209     VOUT_DISPLAY_EVENT_MOUSE_RELEASED,
 210     VOUT_DISPLAY_EVENT_MOUSE_DOUBLE_CLICK,
 211 };
 212
 213 /**
 214  * Vout owner structures
 215  */
 216 struct vout_display_owner_t {
 217     /* Private place holder for the vout_display_t creator
 218      */
 219     vout_display_owner_sys_t *sys;
 220
 221     /* Event coming from the module
 222      *
 223      * This function is set prior to the module instantiation and must not
 224      * be overwritten nor used directly (use the vout_display_SendEvent*
 225      * wrapper.
 226      *
 227      * You can send it at any time i.e. from any vout_display_t functions or
 228      * from another thread.
 229      * Be careful, it does not ensure correct serialization if it is used
 230      * from multiple threads.
 231      */
 232     void            (*event)(vout_display_t *, int, va_list);
 233
 234     /* Window management
 235      *
 236      * These functions are set prior to the module instantiation and must not
 237      * be overwritten nor used directly (use the vout_display_*Window
 238      * wrapper */
 239     vout_window_t *(*window_new)(vout_display_t *, const vout_window_cfg_t *);
 240     void           (*window_del)(vout_display_t *, vout_window_t *);
 241 };
 242
 243 struct vout_display_t {
 244     VLC_COMMON_MEMBERS
 245
 246     /* Module */
 247     module_t *module;
 248
 249     /* Initial and current configuration.
 250      * You cannot modify it directly, you must use the appropriate events.
 251      *
 252      * It reflects the current values, i.e. after the event has been accepted
 253      * and applied/configured if needed.
 254      */
 255     const vout_display_cfg_t *cfg;
 256
 257     /* video source format.
 258      *
 259      * Cropping is not requested while in the open function.
 260      * You cannot change it.
 261      */
 262     video_format_t source;
 263
 264     /* picture_t format.
 265      *
 266      * You can only change it inside the module open function to
 267      * match what you want, and when a VOUT_DISPLAY_RESET_PICTURES control
 268      * request is made and succeeds.
 269      *
 270      * By default, it is equal to ::source except for the aspect ratio
 271      * which is undefined(0) and is ignored.
 272      */
 273     video_format_t fmt;
 274
 275     /* Information
 276      *
 277      * You can only set them in the open function.
 278      */
 279     vout_display_info_t info;
 280
 281     /* Return a pointer over the current picture_pool_t* (mandatory).
 282      *
 283      * For performance reasons, it is best to provide at least count
 284      * pictures but it is not mandatory.
 285      * You can return NULL when you cannot/do not want to allocate
 286      * pictures.
 287      * The vout display module keeps the ownership of the pool and can
 288      * destroy it only when closing or on invalid pictures control.
 289      */
 290     picture_pool_t *(*pool)(vout_display_t *, unsigned count);
 291
 292     /* Prepare a picture and an optional subpicture for display (optional).
 293      *
 294      * It is called before the next pf_display call to provide as much
 295      * time as possible to prepare the given picture and the subpicture
 296      * for display.
 297      * You are guaranted that pf_display will always be called and using
 298      * the exact same picture_t and subpicture_t.
 299      * You cannot change the pixel content of the picture_t or of the
 300      * subpicture_t.
 301      */
 302     void       (*prepare)(vout_display_t *, picture_t *, subpicture_t *);
 303
 304     /* Display a picture and an optional subpicture (mandatory).
 305      *
 306      * The picture and the optional subpicture must be displayed as soon as
 307      * possible.
 308      * You cannot change the pixel content of the picture_t or of the
 309      * subpicture_t.
 310      *
 311      * This function gives away the ownership of the picture and of the
 312      * subpicture, so you must release them as soon as possible.
 313      */
 314     void       (*display)(vout_display_t *, picture_t *, subpicture_t *);
 315
 316     /* Control on the module (mandatory) */
 317     int        (*control)(vout_display_t *, int, va_list);
 318
 319     /* Manage pending event (optional) */
 320     void       (*manage)(vout_display_t *);
 321
 322     /* Private place holder for the vout_display_t module (optional)
 323      *
 324      * A module is free to use it as it wishes.
 325      */
 326     vout_display_sys_t *sys;
 327
 328     /* Reserved for the vout_display_t owner.
 329      *
 330      * It must not be overwritten nor used directly by a module.
 331      */
 332     vout_display_owner_t owner;
 333 };
 334
 335 static inline void vout_display_SendEvent(vout_display_t *vd, int query, ...)
 336 {
 337     va_list args;
 338     va_start(args, query);
 339     vd->owner.event(vd, query, args);
 340     va_end(args);
 341 }
 342
 343 static inline void vout_display_SendEventDisplaySize(vout_display_t *vd, int width, int height, bool is_fullscreen)
 344 {
 345     vout_display_SendEvent(vd, VOUT_DISPLAY_EVENT_DISPLAY_SIZE, width, height, is_fullscreen);
 346 }
 347 static inline void vout_display_SendEventPicturesInvalid(vout_display_t *vd)
 348 {
 349     vout_display_SendEvent(vd, VOUT_DISPLAY_EVENT_PICTURES_INVALID);
 350 }
 351 static inline void vout_display_SendEventClose(vout_display_t *vd)
 352 {
 353     vout_display_SendEvent(vd, VOUT_DISPLAY_EVENT_CLOSE);
 354 }
 355 static inline void vout_display_SendEventKey(vout_display_t *vd, int key)
 356 {
 357     vout_display_SendEvent(vd, VOUT_DISPLAY_EVENT_KEY, key);
 358 }
 359 static inline void vout_display_SendEventFullscreen(vout_display_t *vd, bool is_fullscreen)
 360 {
 361     vout_display_SendEvent(vd, VOUT_DISPLAY_EVENT_FULLSCREEN, is_fullscreen);
 362 }
 363 static inline void vout_display_SendWindowState(vout_display_t *vd, unsigned state)
 364 {
 365     vout_display_SendEvent(vd, VOUT_DISPLAY_EVENT_WINDOW_STATE, state);
 366 }
 367 /* The mouse position (State and Moved event) must be expressed against vout_display_t::source unit */
 368 static inline void vout_display_SendEventMouseState(vout_display_t *vd, int x, int y, int button_mask)
 369 {
 370     vout_display_SendEvent(vd, VOUT_DISPLAY_EVENT_MOUSE_STATE, x, y, button_mask);
 371 }
 372 static inline void vout_display_SendEventMouseMoved(vout_display_t *vd, int x, int y)
 373 {
 374     vout_display_SendEvent(vd, VOUT_DISPLAY_EVENT_MOUSE_MOVED, x, y);
 375 }
 376 static inline void vout_display_SendEventMousePressed(vout_display_t *vd, int button)
 377 {
 378     vout_display_SendEvent(vd, VOUT_DISPLAY_EVENT_MOUSE_PRESSED, button);
 379 }
 380 static inline void vout_display_SendEventMouseReleased(vout_display_t *vd, int button)
 381 {
 382     vout_display_SendEvent(vd, VOUT_DISPLAY_EVENT_MOUSE_RELEASED, button);
 383 }
 384 static inline void vout_display_SendEventMouseDoubleClick(vout_display_t *vd)
 385 {
 386     vout_display_SendEvent(vd, VOUT_DISPLAY_EVENT_MOUSE_DOUBLE_CLICK);
 387 }
 388
 389 /**
 390  * Asks for a new window with the given configuration as hint.
 391  *
 392  * b_standalone/i_x/i_y may be overwritten by the core
 393  */
 394 static inline vout_window_t *vout_display_NewWindow(vout_display_t *vd, const vout_window_cfg_t *cfg)
 395 {
 396     return vd->owner.window_new(vd, cfg);
 397 }
 398 /**
 399  * Deletes a window created by vout_display_NewWindow if window is non NULL
 400  * or any unused windows otherwise.
 401  */
 402 static inline void vout_display_DeleteWindow(vout_display_t *vd,
 403                                              vout_window_t *window)
 404 {
 405     vd->owner.window_del(vd, window);
 406 }
 407
 408 /**
 409  * Computes the default display size given the source and
 410  * the display configuration.
 411  *
 412  * This asssumes that the picture is already cropped.
 413  */
 414 VLC_API void vout_display_GetDefaultDisplaySize(unsigned *width, unsigned *height, const video_format_t *source, const vout_display_cfg_t *);
 415
 416
 417 /**
 418  * Structure used to store the result of a vout_display_PlacePicture.
 419  */
 420 typedef struct {
 421     int x;
 422     int y;
 423     unsigned width;
 424     unsigned height;
 425 } vout_display_place_t;
 426
 427 /**
 428  * Computes how to place a picture inside the display to respect
 429  * the given parameters.
 430  * This assumes that cropping is done by an external mean.
 431  *
 432  * \param p_place Place inside the window (window pixel unit)
 433  * \param p_source Video source format
 434  * \param p_cfg Display configuration
 435  * \param b_clip If true, prevent the video to go outside the display (break zoom).
 436  */
 437 VLC_API void vout_display_PlacePicture(vout_display_place_t *place, const video_format_t *source, const vout_display_cfg_t *cfg, bool do_clipping);
 438
 439 #endif /* VLC_VOUT_DISPLAY_H */
 440