git.sesse.net Git - vlc/blob - include/vlc_filter.h

   1 /*****************************************************************************
   2  * vlc_filter.h: filter related structures and functions
   3  *****************************************************************************
   4  * Copyright (C) 1999-2014 VLC authors and VideoLAN
   5  *
   6  * Authors: Gildas Bazin <gbazin@videolan.org>
   7  *          Antoine Cellerier <dionoea at videolan dot org>
   8  *          Rémi Denis-Courmont
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU Lesser General Public License as published by
  12  * the Free Software Foundation; either version 2.1 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18  * GNU Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with this program; if not, write to the Free Software Foundation,
  22  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 #ifndef VLC_FILTER_H
  26 #define VLC_FILTER_H 1
  27
  28 #include <vlc_es.h>
  29 #include <vlc_picture.h>
  30 #include <vlc_subpicture.h>
  31 #include <vlc_mouse.h>
  32
  33 /**
  34  * \file
  35  * This file defines the structure and types used by video and audio filters
  36  */
  37
  38 typedef struct filter_owner_sys_t filter_owner_sys_t;
  39
  40 typedef struct filter_owner_t
  41 {
  42     void *sys;
  43
  44     union
  45     {
  46         struct
  47         {
  48             picture_t * (*buffer_new)( filter_t * );
  49             void        (*buffer_del)( filter_t *, picture_t * );
  50         } video;
  51         struct
  52         {
  53             subpicture_t * (*buffer_new)( filter_t * );
  54             void           (*buffer_del)( filter_t *, subpicture_t * );
  55         } sub;
  56     };
  57 } filter_owner_t;
  58
  59
  60 /** Structure describing a filter
  61  * @warning BIG FAT WARNING : the code relies on the first 4 members of
  62  * filter_t and decoder_t to be the same, so if you have anything to add,
  63  * do it at the end of the structure.
  64  */
  65 struct filter_t
  66 {
  67     VLC_COMMON_MEMBERS
  68
  69     /* Module properties */
  70     module_t *          p_module;
  71     filter_sys_t *      p_sys;
  72
  73     /* Input format */
  74     es_format_t         fmt_in;
  75
  76     /* Output format of filter */
  77     es_format_t         fmt_out;
  78     bool                b_allow_fmt_out_change;
  79
  80     /* Filter configuration */
  81     config_chain_t *    p_cfg;
  82
  83     union
  84     {
  85         struct
  86         {
  87             picture_t * (*pf_filter) ( filter_t *, picture_t * );
  88             void        (*pf_flush)( filter_t * );
  89             /* Filter mouse state.
  90              *
  91              * If non-NULL, you must convert from output to input formats:
  92              * - If VLC_SUCCESS is returned, the mouse state is propagated.
  93              * - Otherwise, the mouse change is not propagated.
  94              * If NULL, the mouse state is considered unchanged and will be
  95              * propagated.
  96              */
  97             int         (*pf_mouse)( filter_t *, vlc_mouse_t *,
  98                                      const vlc_mouse_t *p_old,
  99                                      const vlc_mouse_t *p_new );
 100         } video;
 101 #define pf_video_filter     u.video.pf_filter
 102 #define pf_video_flush      u.video.pf_flush
 103 #define pf_video_mouse      u.video.pf_mouse
 104
 105         struct
 106         {
 107             block_t *   (*pf_filter) ( filter_t *, block_t * );
 108         } audio;
 109 #define pf_audio_filter     u.audio.pf_filter
 110
 111         struct
 112         {
 113             void        (*pf_blend) ( filter_t *,  picture_t *,
 114                                       const picture_t *, int, int, int );
 115         } blend;
 116 #define pf_video_blend     u.blend.pf_blend
 117
 118         struct
 119         {
 120             subpicture_t * (*pf_source)    ( filter_t *, mtime_t );
 121             int            (*pf_mouse)     ( filter_t *,
 122                                              const vlc_mouse_t *p_old,
 123                                              const vlc_mouse_t *p_new,
 124                                              const video_format_t * );
 125         } sub;
 126 #define pf_sub_source      u.sub.pf_source
 127 #define pf_sub_mouse       u.sub.pf_mouse
 128
 129         struct
 130         {
 131             subpicture_t * (*pf_filter) ( filter_t *, subpicture_t * );
 132         } subf;
 133 #define pf_sub_filter      u.subf.pf_filter
 134
 135         struct
 136         {
 137             int         (*pf_text) ( filter_t *, subpicture_region_t *,
 138                                      subpicture_region_t *,
 139                                      const vlc_fourcc_t * );
 140             int         (*pf_html) ( filter_t *, subpicture_region_t *,
 141                                      subpicture_region_t *,
 142                                      const vlc_fourcc_t * );
 143         } render;
 144 #define pf_render_text     u.render.pf_text
 145 #define pf_render_html     u.render.pf_html
 146
 147     } u;
 148
 149     /* Input attachments
 150      * XXX use filter_GetInputAttachments */
 151     int (*pf_get_attachments)( filter_t *, input_attachment_t ***, int * );
 152
 153     /* Private structure for the owner of the decoder */
 154     filter_owner_t      owner;
 155 };
 156
 157 /**
 158  * This function will return a new picture usable by p_filter as an output
 159  * buffer. You have to release it using filter_DeletePicture or by returning
 160  * it to the caller as a pf_video_filter return value.
 161  * Provided for convenience.
 162  *
 163  * \param p_filter filter_t object
 164  * \return new picture on success or NULL on failure
 165  */
 166 static inline picture_t *filter_NewPicture( filter_t *p_filter )
 167 {
 168     picture_t *pic = p_filter->owner.video.buffer_new( p_filter );
 169     if( pic == NULL )
 170         msg_Warn( p_filter, "can't get output picture" );
 171     return pic;
 172 }
 173
 174 /**
 175  * This function will release a picture create by filter_NewPicture.
 176  * Provided for convenience.
 177  *
 178  * \param p_filter filter_t object
 179  * \param p_picture picture to be deleted
 180  */
 181 static inline void filter_DeletePicture( filter_t *p_filter, picture_t *pic )
 182 {
 183     p_filter->owner.video.buffer_del( p_filter, pic );
 184 }
 185
 186 /**
 187  * This function will flush the state of a video filter.
 188  */
 189 static inline void filter_FlushPictures( filter_t *p_filter )
 190 {
 191     if( p_filter->pf_video_flush )
 192         p_filter->pf_video_flush( p_filter );
 193 }
 194
 195 /**
 196  * This function will return a new subpicture usable by p_filter as an output
 197  * buffer. You have to release it using filter_DeleteSubpicture or by returning
 198  * it to the caller as a pf_sub_source return value.
 199  * Provided for convenience.
 200  *
 201  * \param p_filter filter_t object
 202  * \return new subpicture
 203  */
 204 static inline subpicture_t *filter_NewSubpicture( filter_t *p_filter )
 205 {
 206     subpicture_t *subpic = p_filter->owner.sub.buffer_new( p_filter );
 207     if( subpic == NULL )
 208         msg_Warn( p_filter, "can't get output subpicture" );
 209     return subpic;
 210 }
 211
 212 /**
 213  * This function will release a subpicture create by filter_NewSubicture.
 214  * Provided for convenience.
 215  *
 216  * \param p_filter filter_t object
 217  * \param p_subpicture to be released
 218  */
 219 static inline void filter_DeleteSubpicture( filter_t *p_filter,
 220                                             subpicture_t *subpic )
 221 {
 222     p_filter->owner.sub.buffer_del( p_filter, subpic );
 223 }
 224
 225 /**
 226  * This function gives all input attachments at once.
 227  *
 228  * You MUST release the returned values
 229  */
 230 static inline int filter_GetInputAttachments( filter_t *p_filter,
 231                                               input_attachment_t ***ppp_attachment,
 232                                               int *pi_attachment )
 233 {
 234     if( !p_filter->pf_get_attachments )
 235         return VLC_EGENERIC;
 236     return p_filter->pf_get_attachments( p_filter,
 237                                          ppp_attachment, pi_attachment );
 238 }
 239
 240 /**
 241  * It creates a blend filter.
 242  *
 243  * Only the chroma properties of the dest format is used (chroma
 244  * type, rgb masks and shifts)
 245  */
 246 VLC_API filter_t * filter_NewBlend( vlc_object_t *, const video_format_t *p_dst_chroma ) VLC_USED;
 247
 248 /**
 249  * It configures blend filter parameters that are allowed to changed
 250  * after the creation.
 251  */
 252 VLC_API int filter_ConfigureBlend( filter_t *, int i_dst_width, int i_dst_height, const video_format_t *p_src );
 253
 254 /**
 255  * It blends a picture into another one.
 256  *
 257  * The input picture is not modified and not released.
 258  */
 259 VLC_API int filter_Blend( filter_t *, picture_t *p_dst, int i_dst_x, int i_dst_y, const picture_t *p_src, int i_alpha );
 260
 261 /**
 262  * It destroys a blend filter created by filter_NewBlend.
 263  */
 264 VLC_API void filter_DeleteBlend( filter_t * );
 265
 266 /**
 267  * Create a picture_t *(*)( filter_t *, picture_t * ) compatible wrapper
 268  * using a void (*)( filter_t *, picture_t *, picture_t * ) function
 269  *
 270  * Currently used by the chroma video filters
 271  */
 272 #define VIDEO_FILTER_WRAPPER( name )                                    \
 273     static picture_t *name ## _Filter ( filter_t *p_filter,             \
 274                                         picture_t *p_pic )              \
 275     {                                                                   \
 276         picture_t *p_outpic = filter_NewPicture( p_filter );            \
 277         if( p_outpic )                                                  \
 278         {                                                               \
 279             name( p_filter, p_pic, p_outpic );                          \
 280             picture_CopyProperties( p_outpic, p_pic );                  \
 281         }                                                               \
 282         picture_Release( p_pic );                                       \
 283         return p_outpic;                                                \
 284     }
 285
 286 /**
 287  * Filter chain management API
 288  * The filter chain management API is used to dynamically construct filters
 289  * and add them in a chain.
 290  */
 291
 292 typedef struct filter_chain_t filter_chain_t;
 293
 294 /**
 295  * Create new filter chain
 296  *
 297  * \param p_object pointer to a vlc object
 298  * \param psz_capability vlc capability of filters in filter chain
 299  * \param b_allow_format_fmt_change allow changing of fmt
 300  * \return pointer to a filter chain
 301  */
 302 VLC_API filter_chain_t * filter_chain_New( vlc_object_t *, const char *, bool )
 303 VLC_USED;
 304 #define filter_chain_New( a, b, c ) filter_chain_New( VLC_OBJECT( a ), b, c )
 305
 306 /**
 307  * Creates a new video filter chain.
 308  *
 309  * \param obj pointer to parent VLC object
 310  * \param change whether to allow changing the output format
 311  * \param owner owner video buffer callbacks
 312  * \return new filter chain, or NULL on error
 313  */
 314 VLC_API filter_chain_t * filter_chain_NewVideo( vlc_object_t *obj, bool change,
 315                                                 const filter_owner_t *owner )
 316 VLC_USED;
 317 #define filter_chain_NewVideo( a, b, c ) \
 318         filter_chain_NewVideo( VLC_OBJECT( a ), b, c )
 319
 320 /**
 321  * Delete filter chain will delete all filters in the chain and free all
 322  * allocated data. The pointer to the filter chain is then no longer valid.
 323  *
 324  * \param p_chain pointer to filter chain
 325  */
 326 VLC_API void filter_chain_Delete( filter_chain_t * );
 327
 328 /**
 329  * Reset filter chain will delete all filters in the chain and
 330  * reset p_fmt_in and p_fmt_out to the new values.
 331  *
 332  * \param p_chain pointer to filter chain
 333  * \param p_fmt_in new fmt_in params
 334  * \param p_fmt_out new fmt_out params
 335  */
 336 VLC_API void filter_chain_Reset( filter_chain_t *, const es_format_t *, const es_format_t * );
 337
 338 /**
 339  * Append filter to the end of the chain.
 340  *
 341  * \param p_chain pointer to filter chain
 342  * \param psz_name name of filter
 343  * \param p_cfg
 344  * \param p_fmt_in input es_format_t
 345  * \param p_fmt_out output es_format_t
 346  * \return pointer to filter chain
 347  */
 348 VLC_API filter_t * filter_chain_AppendFilter( filter_chain_t *, const char *, config_chain_t *, const es_format_t *, const es_format_t * );
 349
 350 /**
 351  * Append new filter to filter chain from string.
 352  *
 353  * \param p_chain pointer to filter chain
 354  * \param psz_string string of filters
 355  * \return 0 for success
 356  */
 357 VLC_API int filter_chain_AppendFromString( filter_chain_t *, const char * );
 358
 359 /**
 360  * Delete filter from filter chain. This function also releases the filter
 361  * object and unloads the filter modules. The pointer to p_filter is no
 362  * longer valid after this function successfully returns.
 363  *
 364  * \param p_chain pointer to filter chain
 365  * \param p_filter pointer to filter object
 366  * \return VLC_SUCCESS on succes, else VLC_EGENERIC
 367  */
 368 VLC_API int filter_chain_DeleteFilter( filter_chain_t *, filter_t * );
 369
 370 /**
 371  * Get the number of filters in the filter chain.
 372  *
 373  * \param p_chain pointer to filter chain
 374  * \return number of filters in this filter chain
 375  */
 376 VLC_API int filter_chain_GetLength( filter_chain_t * );
 377
 378 /**
 379  * Get last p_fmt_out in the chain.
 380  *
 381  * \param p_chain pointer to filter chain
 382  * \return last p_fmt (es_format_t) of this filter chain
 383  */
 384 VLC_API const es_format_t * filter_chain_GetFmtOut( filter_chain_t * );
 385
 386 /**
 387  * Apply the filter chain to a video picture.
 388  *
 389  * \param p_chain pointer to filter chain
 390  * \param p_picture picture to apply filters on
 391  * \return modified picture after applying all video filters
 392  */
 393 VLC_API picture_t * filter_chain_VideoFilter( filter_chain_t *, picture_t * );
 394
 395 /**
 396  * Flush a video filter chain.
 397  */
 398 VLC_API void filter_chain_VideoFlush( filter_chain_t * );
 399
 400 /**
 401  * Apply the filter chain to a audio block.
 402  *
 403  * \param p_chain pointer to filter chain
 404  * \param p_block audio frame to apply filters on
 405  * \return modified audio frame after applying all audio filters
 406  */
 407 VLC_API block_t * filter_chain_AudioFilter( filter_chain_t *, block_t * );
 408
 409 /**
 410  * Apply filter chain to subpictures.
 411  *
 412  * \param p_chain pointer to filter chain
 413  * \param display_date of subpictures
 414  */
 415 void filter_chain_SubSource( filter_chain_t *, spu_t *, mtime_t );
 416
 417 /**
 418  * Apply filter chain to subpictures.
 419  *
 420  * \param p_chain pointer to filter chain
 421  * \param p_subpicture subpicture to apply filters on
 422  * \return modified subpicture after applying all subpicture filters
 423  */
 424 VLC_API subpicture_t * filter_chain_SubFilter( filter_chain_t *, subpicture_t * );
 425
 426 /**
 427  * Apply the filter chain to a mouse state.
 428  *
 429  * It will be applied from the output to the input. It makes sense only
 430  * for a video filter chain.
 431  *
 432  * The vlc_mouse_t* pointers may be the same.
 433  */
 434 VLC_API int filter_chain_MouseFilter( filter_chain_t *, vlc_mouse_t *, const vlc_mouse_t * );
 435
 436 /**
 437  * Inform the filter chain of mouse state.
 438  *
 439  * It makes sense only for a sub source chain.
 440  */
 441 VLC_API int filter_chain_MouseEvent( filter_chain_t *, const vlc_mouse_t *, const video_format_t * );
 442
 443 int filter_chain_ForEach( filter_chain_t *chain,
 444                           int (*cb)( filter_t *, void * ), void *opaque );
 445
 446 #endif /* _VLC_FILTER_H */
 447