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1 /*****************************************************************************
2  * vlc_filter.h: filter related structures and functions
3  *****************************************************************************
4  * Copyright (C) 1999-2008 the VideoLAN team
5  * $Id$
6  *
7  * Authors: Gildas Bazin <gbazin@videolan.org>
8  *          Antoine Cellerier <dionoea at videolan dot org>
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2 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 General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, 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 /** Structure describing a filter
41  * @warning BIG FAT WARNING : the code relies on the first 4 members of
42  * filter_t and decoder_t to be the same, so if you have anything to add,
43  * do it at the end of the structure.
44  */
45 struct filter_t
46 {
47     VLC_COMMON_MEMBERS
48
49     /* Module properties */
50     module_t *          p_module;
51     filter_sys_t *      p_sys;
52
53     /* Input format */
54     es_format_t         fmt_in;
55
56     /* Output format of filter */
57     es_format_t         fmt_out;
58     bool                b_allow_fmt_out_change;
59
60     /* Filter configuration */
61     config_chain_t *    p_cfg;
62
63     union
64     {
65         struct
66         {
67             picture_t * (*pf_filter) ( filter_t *, picture_t * );
68             void        (*pf_flush)( filter_t * );
69             picture_t * (*pf_buffer_new) ( filter_t * );
70             void        (*pf_buffer_del) ( filter_t *, picture_t * );
71             /* Filter mouse state.
72              *
73              * If non-NULL, you must convert from output to input formats:
74              * - If VLC_SUCCESS is returned, the mouse state is propagated.
75              * - Otherwise, the mouse change is not propagated.
76              * If NULL, the mouse state is considered unchanged and will be
77              * propagated.
78              */
79             int         (*pf_mouse)( filter_t *, vlc_mouse_t *,
80                                      const vlc_mouse_t *p_old,
81                                      const vlc_mouse_t *p_new );
82         } video;
83 #define pf_video_filter     u.video.pf_filter
84 #define pf_video_flush      u.video.pf_flush
85 #define pf_video_mouse      u.video.pf_mouse
86 #define pf_video_buffer_new u.video.pf_buffer_new
87 #define pf_video_buffer_del u.video.pf_buffer_del
88
89         struct
90         {
91             block_t *   (*pf_filter) ( filter_t *, block_t * );
92         } audio;
93 #define pf_audio_filter     u.audio.pf_filter
94
95         struct
96         {
97             void        (*pf_blend) ( filter_t *,  picture_t *,
98                                       const picture_t *, int, int, int );
99         } blend;
100 #define pf_video_blend     u.blend.pf_blend
101
102         struct
103         {
104             subpicture_t * (*pf_source)    ( filter_t *, mtime_t );
105             subpicture_t * (*pf_buffer_new)( filter_t * );
106             void           (*pf_buffer_del)( filter_t *, subpicture_t * );
107             int            (*pf_mouse)     ( filter_t *,
108                                              const vlc_mouse_t *p_old,
109                                              const vlc_mouse_t *p_new,
110                                              const video_format_t * );
111         } sub;
112 #define pf_sub_source      u.sub.pf_source
113 #define pf_sub_buffer_new  u.sub.pf_buffer_new
114 #define pf_sub_buffer_del  u.sub.pf_buffer_del
115 #define pf_sub_mouse       u.sub.pf_mouse
116
117         struct
118         {
119             subpicture_t * (*pf_filter) ( filter_t *, subpicture_t * );
120         } subf;
121 #define pf_sub_filter      u.subf.pf_filter
122
123         struct
124         {
125             int         (*pf_text) ( filter_t *, subpicture_region_t *,
126                                      subpicture_region_t *,
127                                      const vlc_fourcc_t * );
128             int         (*pf_html) ( filter_t *, subpicture_region_t *,
129                                      subpicture_region_t *,
130                                      const vlc_fourcc_t * );
131         } render;
132 #define pf_render_text     u.render.pf_text
133 #define pf_render_html     u.render.pf_html
134
135     } u;
136
137     /* Input attachments
138      * XXX use filter_GetInputAttachments */
139     int (*pf_get_attachments)( filter_t *, input_attachment_t ***, int * );
140
141     /* Private structure for the owner of the decoder */
142     filter_owner_sys_t *p_owner;
143 };
144
145 /**
146  * This function will return a new picture usable by p_filter as an output
147  * buffer. You have to release it using filter_DeletePicture or by returning
148  * it to the caller as a pf_video_filter return value.
149  * Provided for convenience.
150  *
151  * \param p_filter filter_t object
152  * \return new picture on success or NULL on failure
153  */
154 static inline picture_t *filter_NewPicture( filter_t *p_filter )
155 {
156     picture_t *p_picture = p_filter->pf_video_buffer_new( p_filter );
157     if( !p_picture )
158         msg_Warn( p_filter, "can't get output picture" );
159     return p_picture;
160 }
161
162 /**
163  * This function will release a picture create by filter_NewPicture.
164  * Provided for convenience.
165  *
166  * \param p_filter filter_t object
167  * \param p_picture picture to be deleted
168  */
169 static inline void filter_DeletePicture( filter_t *p_filter, picture_t *p_picture )
170 {
171     p_filter->pf_video_buffer_del( p_filter, p_picture );
172 }
173
174 /**
175  * This function will flush the state of a video filter.
176  */
177 static inline void filter_FlushPictures( filter_t *p_filter )
178 {
179     if( p_filter->pf_video_flush )
180         p_filter->pf_video_flush( p_filter );
181 }
182
183 /**
184  * This function will return a new subpicture usable by p_filter as an output
185  * buffer. You have to release it using filter_DeleteSubpicture or by returning
186  * it to the caller as a pf_sub_source return value.
187  * Provided for convenience.
188  *
189  * \param p_filter filter_t object
190  * \return new subpicture
191  */
192 static inline subpicture_t *filter_NewSubpicture( filter_t *p_filter )
193 {
194     subpicture_t *p_subpicture = p_filter->pf_sub_buffer_new( p_filter );
195     if( !p_subpicture )
196         msg_Warn( p_filter, "can't get output subpicture" );
197     return p_subpicture;
198 }
199
200 /**
201  * This function will release a subpicture create by filter_NewSubicture.
202  * Provided for convenience.
203  *
204  * \param p_filter filter_t object
205  * \param p_subpicture to be released
206  */
207 static inline void filter_DeleteSubpicture( filter_t *p_filter, subpicture_t *p_subpicture )
208 {
209     p_filter->pf_sub_buffer_del( p_filter, p_subpicture );
210 }
211
212 #define filter_NewAudioBuffer block_New
213
214 /**
215  * This function gives all input attachments at once.
216  *
217  * You MUST release the returned values
218  */
219 static inline int filter_GetInputAttachments( filter_t *p_filter,
220                                               input_attachment_t ***ppp_attachment,
221                                               int *pi_attachment )
222 {
223     if( !p_filter->pf_get_attachments )
224         return VLC_EGENERIC;
225     return p_filter->pf_get_attachments( p_filter,
226                                          ppp_attachment, pi_attachment );
227 }
228
229 /**
230  * It creates a blend filter.
231  *
232  * Only the chroma properties of the dest format is used (chroma
233  * type, rgb masks and shifts)
234  */
235 VLC_API filter_t * filter_NewBlend( vlc_object_t *, const video_format_t *p_dst_chroma ) VLC_USED;
236
237 /**
238  * It configures blend filter parameters that are allowed to changed
239  * after the creation.
240  */
241 VLC_API int filter_ConfigureBlend( filter_t *, int i_dst_width, int i_dst_height, const video_format_t *p_src );
242
243 /**
244  * It blends a picture into another one.
245  *
246  * The input picture is not modified and not released.
247  */
248 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 );
249
250 /**
251  * It destroys a blend filter created by filter_NewBlend.
252  */
253 VLC_API void filter_DeleteBlend( filter_t * );
254
255 /**
256  * Create a picture_t *(*)( filter_t *, picture_t * ) compatible wrapper
257  * using a void (*)( filter_t *, picture_t *, picture_t * ) function
258  *
259  * Currently used by the chroma video filters
260  */
261 #define VIDEO_FILTER_WRAPPER( name )                                    \
262     static picture_t *name ## _Filter ( filter_t *p_filter,             \
263                                         picture_t *p_pic )              \
264     {                                                                   \
265         picture_t *p_outpic = filter_NewPicture( p_filter );            \
266         if( p_outpic )                                                  \
267         {                                                               \
268             name( p_filter, p_pic, p_outpic );                          \
269             picture_CopyProperties( p_outpic, p_pic );                  \
270         }                                                               \
271         picture_Release( p_pic );                                       \
272         return p_outpic;                                                \
273     }
274
275 /**
276  * Filter chain management API
277  * The filter chain management API is used to dynamically construct filters
278  * and add them in a chain.
279  */
280
281 typedef struct filter_chain_t filter_chain_t;
282
283 /**
284  * Create new filter chain
285  *
286  * \param p_object pointer to a vlc object
287  * \param psz_capability vlc capability of filters in filter chain
288  * \param b_allow_format_fmt_change allow changing of fmt
289  * \param pf_buffer_allocation_init callback function to initialize buffer allocations
290  * \param pf_buffer_allocation_clear callback function to clear buffer allocation initialization
291  * \param p_buffer_allocation_data pointer to private allocation data
292  * \return pointer to a filter chain
293  */
294 VLC_API filter_chain_t * filter_chain_New( vlc_object_t *, const char *, bool, int (*)( filter_t *, void * ), void (*)( filter_t * ), void *  ) VLC_USED;
295 #define filter_chain_New( a, b, c, d, e, f ) filter_chain_New( VLC_OBJECT( a ), b, c, d, e, f )
296
297 /**
298  * Delete filter chain will delete all filters in the chain and free all
299  * allocated data. The pointer to the filter chain is then no longer valid.
300  *
301  * \param p_chain pointer to filter chain
302  */
303 VLC_API void filter_chain_Delete( filter_chain_t * );
304
305 /**
306  * Reset filter chain will delete all filters in the chain and
307  * reset p_fmt_in and p_fmt_out to the new values.
308  *
309  * \param p_chain pointer to filter chain
310  * \param p_fmt_in new fmt_in params
311  * \param p_fmt_out new fmt_out params
312  */
313 VLC_API void filter_chain_Reset( filter_chain_t *, const es_format_t *, const es_format_t * );
314
315 /**
316  * Append filter to the end of the chain.
317  *
318  * \param p_chain pointer to filter chain
319  * \param psz_name name of filter
320  * \param p_cfg
321  * \param p_fmt_in input es_format_t
322  * \param p_fmt_out output es_format_t
323  * \return pointer to filter chain
324  */
325 VLC_API filter_t * filter_chain_AppendFilter( filter_chain_t *, const char *, config_chain_t *, const es_format_t *, const es_format_t * );
326
327 /**
328  * Append new filter to filter chain from string.
329  *
330  * \param p_chain pointer to filter chain
331  * \param psz_string string of filters
332  * \return 0 for success
333  */
334 VLC_API int filter_chain_AppendFromString( filter_chain_t *, const char * );
335
336 /**
337  * Delete filter from filter chain. This function also releases the filter
338  * object and unloads the filter modules. The pointer to p_filter is no
339  * longer valid after this function successfully returns.
340  *
341  * \param p_chain pointer to filter chain
342  * \param p_filter pointer to filter object
343  * \return VLC_SUCCESS on succes, else VLC_EGENERIC
344  */
345 VLC_API int filter_chain_DeleteFilter( filter_chain_t *, filter_t * );
346
347 /**
348  * Get the number of filters in the filter chain.
349  *
350  * \param p_chain pointer to filter chain
351  * \return number of filters in this filter chain
352  */
353 VLC_API int filter_chain_GetLength( filter_chain_t * );
354
355 /**
356  * Get last p_fmt_out in the chain.
357  *
358  * \param p_chain pointer to filter chain
359  * \return last p_fmt (es_format_t) of this filter chain
360  */
361 VLC_API const es_format_t * filter_chain_GetFmtOut( filter_chain_t * );
362
363 /**
364  * Apply the filter chain to a video picture.
365  *
366  * \param p_chain pointer to filter chain
367  * \param p_picture picture to apply filters on
368  * \return modified picture after applying all video filters
369  */
370 VLC_API picture_t * filter_chain_VideoFilter( filter_chain_t *, picture_t * );
371
372 /**
373  * Flush a video filter chain.
374  */
375 VLC_API void filter_chain_VideoFlush( filter_chain_t * );
376
377 /**
378  * Apply the filter chain to a audio block.
379  *
380  * \param p_chain pointer to filter chain
381  * \param p_block audio frame to apply filters on
382  * \return modified audio frame after applying all audio filters
383  */
384 VLC_API block_t * filter_chain_AudioFilter( filter_chain_t *, block_t * );
385
386 /**
387  * Apply filter chain to subpictures.
388  *
389  * \param p_chain pointer to filter chain
390  * \param display_date of subpictures
391  */
392 VLC_API void filter_chain_SubSource( filter_chain_t *, mtime_t );
393
394 /**
395  * Apply filter chain to subpictures.
396  *
397  * \param p_chain pointer to filter chain
398  * \param p_subpicture subpicture to apply filters on
399  * \return modified subpicture after applying all subpicture filters
400  */
401 VLC_API subpicture_t * filter_chain_SubFilter( filter_chain_t *, subpicture_t * );
402
403 /**
404  * Apply the filter chain to a mouse state.
405  *
406  * It will be applied from the output to the input. It makes sense only
407  * for a video filter chain.
408  *
409  * The vlc_mouse_t* pointers may be the same.
410  */
411 VLC_API int filter_chain_MouseFilter( filter_chain_t *, vlc_mouse_t *, const vlc_mouse_t * );
412
413 /**
414  * Inform the filter chain of mouse state.
415  *
416  * It makes sense only for a sub source chain.
417  */
418 VLC_API int filter_chain_MouseEvent( filter_chain_t *, const vlc_mouse_t *, const video_format_t * );
419
420 #endif /* _VLC_FILTER_H */
421