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vlc_filter.h
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1 /*****************************************************************************
2  * vlc_filter.h: filter related structures and functions
3  *****************************************************************************
4  * Copyright (C) 1999-2008 VLC authors and VideoLAN
5  * $Id: 320cbac3a4a5b8461ec41eabd77f323bbbc509dd $
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 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 /** 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 /**
213  * This function gives all input attachments at once.
214  *
215  * You MUST release the returned values
216  */
217 static inline int filter_GetInputAttachments( filter_t *p_filter,
218  input_attachment_t ***ppp_attachment,
219  int *pi_attachment )
220 {
221  if( !p_filter->pf_get_attachments )
222  return VLC_EGENERIC;
223  return p_filter->pf_get_attachments( p_filter,
224  ppp_attachment, pi_attachment );
225 }
226 
227 /**
228  * It creates a blend filter.
229  *
230  * Only the chroma properties of the dest format is used (chroma
231  * type, rgb masks and shifts)
232  */
233 VLC_API filter_t * filter_NewBlend( vlc_object_t *, const video_format_t *p_dst_chroma ) VLC_USED;
234 
235 /**
236  * It configures blend filter parameters that are allowed to changed
237  * after the creation.
238  */
239 VLC_API int filter_ConfigureBlend( filter_t *, int i_dst_width, int i_dst_height, const video_format_t *p_src );
240 
241 /**
242  * It blends a picture into another one.
243  *
244  * The input picture is not modified and not released.
245  */
246 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 );
247 
248 /**
249  * It destroys a blend filter created by filter_NewBlend.
250  */
251 VLC_API void filter_DeleteBlend( filter_t * );
252 
253 /**
254  * Create a picture_t *(*)( filter_t *, picture_t * ) compatible wrapper
255  * using a void (*)( filter_t *, picture_t *, picture_t * ) function
256  *
257  * Currently used by the chroma video filters
258  */
259 #define VIDEO_FILTER_WRAPPER( name ) \
260  static picture_t *name ## _Filter ( filter_t *p_filter, \
261  picture_t *p_pic ) \
262  { \
263  picture_t *p_outpic = filter_NewPicture( p_filter ); \
264  if( p_outpic ) \
265  { \
266  name( p_filter, p_pic, p_outpic ); \
267  picture_CopyProperties( p_outpic, p_pic ); \
268  } \
269  picture_Release( p_pic ); \
270  return p_outpic; \
271  }
272 
273 /**
274  * Filter chain management API
275  * The filter chain management API is used to dynamically construct filters
276  * and add them in a chain.
277  */
278 
279 typedef struct filter_chain_t filter_chain_t;
280 
281 /**
282  * Create new filter chain
283  *
284  * \param p_object pointer to a vlc object
285  * \param psz_capability vlc capability of filters in filter chain
286  * \param b_allow_format_fmt_change allow changing of fmt
287  * \param pf_buffer_allocation_init callback function to initialize buffer allocations
288  * \param pf_buffer_allocation_clear callback function to clear buffer allocation initialization
289  * \param p_buffer_allocation_data pointer to private allocation data
290  * \return pointer to a filter chain
291  */
292 VLC_API filter_chain_t * filter_chain_New( vlc_object_t *, const char *, bool, int (*)( filter_t *, void * ), void (*)( filter_t * ), void * ) VLC_USED;
293 #define filter_chain_New( a, b, c, d, e, f ) filter_chain_New( VLC_OBJECT( a ), b, c, d, e, f )
294 
295 /**
296  * Delete filter chain will delete all filters in the chain and free all
297  * allocated data. The pointer to the filter chain is then no longer valid.
298  *
299  * \param p_chain pointer to filter chain
300  */
301 VLC_API void filter_chain_Delete( filter_chain_t * );
302 
303 /**
304  * Reset filter chain will delete all filters in the chain and
305  * reset p_fmt_in and p_fmt_out to the new values.
306  *
307  * \param p_chain pointer to filter chain
308  * \param p_fmt_in new fmt_in params
309  * \param p_fmt_out new fmt_out params
310  */
311 VLC_API void filter_chain_Reset( filter_chain_t *, const es_format_t *, const es_format_t * );
312 
313 /**
314  * Append filter to the end of the chain.
315  *
316  * \param p_chain pointer to filter chain
317  * \param psz_name name of filter
318  * \param p_cfg
319  * \param p_fmt_in input es_format_t
320  * \param p_fmt_out output es_format_t
321  * \return pointer to filter chain
322  */
323 VLC_API filter_t * filter_chain_AppendFilter( filter_chain_t *, const char *, config_chain_t *, const es_format_t *, const es_format_t * );
324 
325 /**
326  * Append new filter to filter chain from string.
327  *
328  * \param p_chain pointer to filter chain
329  * \param psz_string string of filters
330  * \return 0 for success
331  */
332 VLC_API int filter_chain_AppendFromString( filter_chain_t *, const char * );
333 
334 /**
335  * Delete filter from filter chain. This function also releases the filter
336  * object and unloads the filter modules. The pointer to p_filter is no
337  * longer valid after this function successfully returns.
338  *
339  * \param p_chain pointer to filter chain
340  * \param p_filter pointer to filter object
341  * \return VLC_SUCCESS on succes, else VLC_EGENERIC
342  */
343 VLC_API int filter_chain_DeleteFilter( filter_chain_t *, filter_t * );
344 
345 /**
346  * Get the number of filters in the filter chain.
347  *
348  * \param p_chain pointer to filter chain
349  * \return number of filters in this filter chain
350  */
351 VLC_API int filter_chain_GetLength( filter_chain_t * );
352 
353 /**
354  * Get last p_fmt_out in the chain.
355  *
356  * \param p_chain pointer to filter chain
357  * \return last p_fmt (es_format_t) of this filter chain
358  */
359 VLC_API const es_format_t * filter_chain_GetFmtOut( filter_chain_t * );
360 
361 /**
362  * Apply the filter chain to a video picture.
363  *
364  * \param p_chain pointer to filter chain
365  * \param p_picture picture to apply filters on
366  * \return modified picture after applying all video filters
367  */
368 VLC_API picture_t * filter_chain_VideoFilter( filter_chain_t *, picture_t * );
369 
370 /**
371  * Flush a video filter chain.
372  */
373 VLC_API void filter_chain_VideoFlush( filter_chain_t * );
374 
375 /**
376  * Apply the filter chain to a audio block.
377  *
378  * \param p_chain pointer to filter chain
379  * \param p_block audio frame to apply filters on
380  * \return modified audio frame after applying all audio filters
381  */
382 VLC_API block_t * filter_chain_AudioFilter( filter_chain_t *, block_t * );
383 
384 /**
385  * Apply filter chain to subpictures.
386  *
387  * \param p_chain pointer to filter chain
388  * \param display_date of subpictures
389  */
390 VLC_API void filter_chain_SubSource( filter_chain_t *, mtime_t );
391 
392 /**
393  * Apply filter chain to subpictures.
394  *
395  * \param p_chain pointer to filter chain
396  * \param p_subpicture subpicture to apply filters on
397  * \return modified subpicture after applying all subpicture filters
398  */
399 VLC_API subpicture_t * filter_chain_SubFilter( filter_chain_t *, subpicture_t * );
400 
401 /**
402  * Apply the filter chain to a mouse state.
403  *
404  * It will be applied from the output to the input. It makes sense only
405  * for a video filter chain.
406  *
407  * The vlc_mouse_t* pointers may be the same.
408  */
409 VLC_API int filter_chain_MouseFilter( filter_chain_t *, vlc_mouse_t *, const vlc_mouse_t * );
410 
411 /**
412  * Inform the filter chain of mouse state.
413  *
414  * It makes sense only for a sub source chain.
415  */
416 VLC_API int filter_chain_MouseEvent( filter_chain_t *, const vlc_mouse_t *, const video_format_t * );
417 
418 #endif /* _VLC_FILTER_H */
419 
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