1 /*****************************************************************************
2 * vlc_filter.h: filter related structures and functions
3 *****************************************************************************
4 * Copyright (C) 1999-2008 the VideoLAN team
7 * Authors: Gildas Bazin <gbazin@videolan.org>
8 * Antoine Cellerier <dionoea at videolan dot org>
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.
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.
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 *****************************************************************************/
26 #define VLC_FILTER_H 1
29 #include <vlc_picture.h>
30 #include <vlc_subpicture.h>
31 #include <vlc_mouse.h>
35 * This file defines the structure and types used by video and audio filters
38 typedef struct filter_owner_sys_t filter_owner_sys_t;
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.
49 /* Module properties */
56 /* Output format of filter */
58 bool b_allow_fmt_out_change;
60 /* Filter configuration */
61 config_chain_t * p_cfg;
63 picture_t * ( * pf_video_filter ) ( filter_t *, picture_t * );
64 block_t * ( * pf_audio_filter ) ( filter_t *, block_t * );
65 void ( * pf_video_blend ) ( filter_t *,
66 picture_t *, const picture_t *,
69 subpicture_t * ( *pf_sub_filter ) ( filter_t *, mtime_t );
70 int ( *pf_render_text ) ( filter_t *, subpicture_region_t *,
71 subpicture_region_t * );
72 int ( *pf_render_html ) ( filter_t *, subpicture_region_t *,
73 subpicture_region_t * );
75 /* Filter mouse state.
77 * If non NULL, you must convert from output format to input format,
78 * if VLC_SUCCESS is returned, the mouse state is then propagated.
79 * If NULL, the mouse state is considered unchanged and will be
82 * If VLC_SUCCESS is not returned, the mouse changes are not propagated.
84 int ( *pf_mouse )( filter_t *, vlc_mouse_t *,
85 const vlc_mouse_t *p_old,
86 const vlc_mouse_t *p_new );
91 /* Audio output callbacks */
92 block_t * ( * pf_audio_buffer_new) ( filter_t *, int );
94 /* Video output callbacks */
95 picture_t * ( * pf_vout_buffer_new) ( filter_t * );
96 void ( * pf_vout_buffer_del) ( filter_t *, picture_t * );
97 /* void ( * pf_picture_link) ( picture_t * );
98 void ( * pf_picture_unlink) ( picture_t * ); */
100 /* SPU output callbacks */
101 subpicture_t * ( * pf_sub_buffer_new) ( filter_t * );
102 void ( * pf_sub_buffer_del) ( filter_t *, subpicture_t * );
104 /* Private structure for the owner of the decoder */
105 filter_owner_sys_t *p_owner;
109 * This function will return a new picture usable by p_filter as an output
110 * buffer. You have to release it using filter_DeletePicture or by returning
111 * it to the caller as a pf_video_filter return value.
112 * Provided for convenience.
114 * \param p_filter filter_t object
115 * \return new picture on success or NULL on failure
117 static inline picture_t *filter_NewPicture( filter_t *p_filter )
119 picture_t *p_picture = p_filter->pf_vout_buffer_new( p_filter );
121 msg_Warn( p_filter, "can't get output picture" );
126 * This function will release a picture create by filter_NewPicture.
127 * Provided for convenience.
129 * \param p_filter filter_t object
130 * \param p_picture picture to be deleted
132 static inline void filter_DeletePicture( filter_t *p_filter, picture_t *p_picture )
134 p_filter->pf_vout_buffer_del( p_filter, p_picture );
138 * This function will return a new subpicture usable by p_filter as an output
139 * buffer. You have to release it using filter_DeleteSubpicture or by returning
140 * it to the caller as a pf_sub_filter return value.
141 * Provided for convenience.
143 * \param p_filter filter_t object
144 * \return new subpicture
146 static inline subpicture_t *filter_NewSubpicture( filter_t *p_filter )
148 subpicture_t *p_subpicture = p_filter->pf_sub_buffer_new( p_filter );
150 msg_Warn( p_filter, "can't get output subpicture" );
155 * This function will release a subpicture create by filter_NewSubicture.
156 * Provided for convenience.
158 * \param p_filter filter_t object
159 * \param p_subpicture to be released
161 static inline void filter_DeleteSubpicture( filter_t *p_filter, subpicture_t *p_subpicture )
163 p_filter->pf_sub_buffer_del( p_filter, p_subpicture );
167 * This function will return a new audio buffer usable by p_filter as an
168 * output buffer. You have to release it using block_Release or by returning
169 * it to the caller as a pf_audio_filter return value.
170 * Provided for convenience.
172 * \param p_filter filter_t object
173 * \param i_size size of audio buffer requested
174 * \return block to be used as audio output buffer
176 static inline block_t *filter_NewAudioBuffer( filter_t *p_filter, int i_size )
178 block_t *p_block = p_filter->pf_audio_buffer_new( p_filter, i_size );
180 msg_Warn( p_filter, "can't get output block" );
185 * It creates a blend filter.
187 * Only the chroma properties of the dest format is used (chroma
188 * type, rgb masks and shifts)
190 VLC_EXPORT( filter_t *, filter_NewBlend, ( vlc_object_t *, const video_format_t *p_dst_chroma ) );
193 * It configures blend filter parameters that are allowed to changed
194 * after the creation.
196 VLC_EXPORT( int, filter_ConfigureBlend, ( filter_t *, int i_dst_width, int i_dst_height, const video_format_t *p_src ) );
199 * It blends a picture into another one.
201 * The input picture is not modified and not released.
203 VLC_EXPORT( 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 ) );
206 * It destroys a blend filter created by filter_NewBlend.
208 VLC_EXPORT( void, filter_DeleteBlend, ( filter_t * ) );
211 * Create a picture_t *(*)( filter_t *, picture_t * ) compatible wrapper
212 * using a void (*)( filter_t *, picture_t *, picture_t * ) function
214 * Currently used by the chroma video filters
216 #define VIDEO_FILTER_WRAPPER( name ) \
217 static picture_t *name ## _Filter ( filter_t *p_filter, \
220 picture_t *p_outpic = filter_NewPicture( p_filter ); \
223 name( p_filter, p_pic, p_outpic ); \
224 picture_CopyProperties( p_outpic, p_pic ); \
226 picture_Release( p_pic ); \
231 * Filter chain management API
232 * The filter chain management API is used to dynamically construct filters
233 * and add them in a chain.
236 typedef struct filter_chain_t filter_chain_t;
239 * Create new filter chain
241 * \param p_object pointer to a vlc object
242 * \param psz_capability vlc capability of filters in filter chain
243 * \param b_allow_format_fmt_change allow changing of fmt
244 * \param pf_buffer_allocation_init callback function to initialize buffer allocations
245 * \param pf_buffer_allocation_clear callback function to clear buffer allocation initialization
246 * \param p_buffer_allocation_data pointer to private allocation data
247 * \return pointer to a filter chain
249 VLC_EXPORT( filter_chain_t *, __filter_chain_New, ( vlc_object_t *, const char *, bool, int (*)( filter_t *, void * ), void (*)( filter_t * ), void * ) );
250 #define filter_chain_New( a, b, c, d, e, f ) __filter_chain_New( VLC_OBJECT( a ), b, c, d, e, f )
253 * Delete filter chain will delete all filters in the chain and free all
254 * allocated data. The pointer to the filter chain is then no longer valid.
256 * \param p_chain pointer to filter chain
258 VLC_EXPORT( void, filter_chain_Delete, ( filter_chain_t * ) );
261 * Reset filter chain will delete all filters in the chain and
262 * reset p_fmt_in and p_fmt_out to the new values.
264 * \param p_chain pointer to filter chain
265 * \param p_fmt_in new fmt_in params
266 * \param p_fmt_out new fmt_out params
268 VLC_EXPORT( void, filter_chain_Reset, ( filter_chain_t *, const es_format_t *, const es_format_t * ) );
271 * Append filter to the end of the chain.
273 * \param p_chain pointer to filter chain
274 * \param psz_name name of filter
276 * \param p_fmt_in input es_format_t
277 * \param p_fmt_out output es_format_t
278 * \return pointer to filter chain
280 VLC_EXPORT( filter_t *, filter_chain_AppendFilter, ( filter_chain_t *, const char *, config_chain_t *, const es_format_t *, const es_format_t * ) );
283 * Append new filter to filter chain from string.
285 * \param p_chain pointer to filter chain
286 * \param psz_string string of filters
287 * \return 0 for success
289 VLC_EXPORT( int, filter_chain_AppendFromString, ( filter_chain_t *, const char * ) );
292 * Delete filter from filter chain. This function also releases the filter
293 * object and unloads the filter modules. The pointer to p_filter is no
294 * longer valid after this function successfully returns.
296 * \param p_chain pointer to filter chain
297 * \param p_filter pointer to filter object
298 * \return VLC_SUCCESS on succes, else VLC_EGENERIC
300 VLC_EXPORT( int, filter_chain_DeleteFilter, ( filter_chain_t *, filter_t * ) );
303 * Get the number of filters in the filter chain.
305 * \param p_chain pointer to filter chain
306 * \return number of filters in this filter chain
308 VLC_EXPORT( int, filter_chain_GetLength, ( filter_chain_t * ) );
311 * Get last p_fmt_out in the chain.
313 * \param p_chain pointer to filter chain
314 * \return last p_fmt (es_format_t) of this filter chain
316 VLC_EXPORT( const es_format_t *, filter_chain_GetFmtOut, ( filter_chain_t * ) );
319 * Apply the filter chain to a video picture.
321 * \param p_chain pointer to filter chain
322 * \param p_picture picture to apply filters on
323 * \return modified picture after applying all video filters
325 VLC_EXPORT( picture_t *, filter_chain_VideoFilter, ( filter_chain_t *, picture_t * ) );
328 * Apply the filter chain to a audio block.
330 * \param p_chain pointer to filter chain
331 * \param p_block audio frame to apply filters on
332 * \return modified audio frame after applying all audio filters
334 VLC_EXPORT( block_t *, filter_chain_AudioFilter, ( filter_chain_t *, block_t * ) );
337 * Apply filter chain to subpictures.
339 * \param p_chain pointer to filter chain
340 * \param display_date of subpictures
342 VLC_EXPORT( void, filter_chain_SubFilter, ( filter_chain_t *, mtime_t ) );
345 * Apply the filter chain to a mouse state.
347 * It will be applied from the output to the input. It makes sense only
348 * for a video filter chain.
350 * The vlc_mouse_t* pointers may be the same.
352 VLC_EXPORT( int, filter_chain_MouseFilter, ( filter_chain_t *, vlc_mouse_t *, const vlc_mouse_t * ) );
354 #endif /* _VLC_FILTER_H */