1 /*****************************************************************************
2 * vlc_subpicture.h: subpicture definitions
3 *****************************************************************************
4 * Copyright (C) 1999 - 2009 the VideoLAN team
7 * Authors: Vincent Seguin <seguin@via.ecp.fr>
8 * Samuel Hocevar <sam@via.ecp.fr>
9 * Olivier Aubert <oaubert 47 videolan d07 org>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
24 *****************************************************************************/
26 #ifndef VLC_SUBPICTURE_H
27 #define VLC_SUBPICTURE_H 1
31 * This file defines subpicture structures and functions in vlc
34 #include <vlc_picture.h>
35 #include <vlc_text_style.h>
38 * \defgroup subpicture Video Subpictures
39 * Subpictures are pictures that should be displayed on top of the video, like
41 * \ingroup video_output
46 * Video subtitle region spu core private
48 typedef struct subpicture_region_private_t subpicture_region_private_t;
51 * Video subtitle region
53 * A subtitle region is defined by a picture (graphic) and its rendering
55 * Subtitles contain a list of regions.
57 struct subpicture_region_t
59 video_format_t fmt; /**< format of the picture */
60 picture_t *p_picture; /**< picture comprising this region */
62 int i_x; /**< position of region */
63 int i_y; /**< position of region */
64 int i_align; /**< alignment within a region */
65 int i_alpha; /**< transparency */
67 char *psz_text; /**< text string comprising this region */
68 char *psz_html; /**< HTML version of subtitle (NULL = use psz_text) */
69 text_style_t *p_style; /**< a description of the text style formatting */
71 subpicture_region_t *p_next; /**< next region in the list */
72 subpicture_region_private_t *p_private; /**< Private data for spu_t *only* */
75 /* Subpicture region position flags */
76 #define SUBPICTURE_ALIGN_LEFT 0x1
77 #define SUBPICTURE_ALIGN_RIGHT 0x2
78 #define SUBPICTURE_ALIGN_TOP 0x4
79 #define SUBPICTURE_ALIGN_BOTTOM 0x8
80 #define SUBPICTURE_ALIGN_MASK ( SUBPICTURE_ALIGN_LEFT|SUBPICTURE_ALIGN_RIGHT| \
81 SUBPICTURE_ALIGN_TOP |SUBPICTURE_ALIGN_BOTTOM )
84 * This function will create a new subpicture region.
86 * You must use subpicture_region_Delete to destroy it.
88 VLC_EXPORT( subpicture_region_t *, subpicture_region_New, ( const video_format_t *p_fmt ) );
91 * This function will destroy a subpicture region allocated by
92 * subpicture_region_New.
94 * You may give it NULL.
96 VLC_EXPORT( void, subpicture_region_Delete, ( subpicture_region_t *p_region ) );
99 * This function will destroy a list of subpicture regions allocated by
100 * subpicture_region_New.
102 * Provided for convenience.
104 VLC_EXPORT( void, subpicture_region_ChainDelete, ( subpicture_region_t *p_head ) );
109 typedef struct subpicture_updater_sys_t subpicture_updater_sys_t;
112 int (*pf_validate)( subpicture_t *,
113 bool has_src_changed, const video_format_t *p_fmt_src,
114 bool has_dst_changed, const video_format_t *p_fmt_dst,
116 void (*pf_update) ( subpicture_t *,
117 const video_format_t *p_fmt_src,
118 const video_format_t *p_fmt_dst,
120 void (*pf_destroy) ( subpicture_t * );
121 subpicture_updater_sys_t *p_sys;
122 } subpicture_updater_t;
124 typedef struct subpicture_private_t subpicture_private_t;
129 * Any subtitle destined to be displayed by a video output thread should
130 * be stored in this structure from it's creation to it's effective display.
131 * Subtitle type and flags should only be modified by the output thread. Note
132 * that an empty subtitle MUST have its flags set to 0.
136 /** \name Channel ID */
138 int i_channel; /**< subpicture channel ID */
141 /** \name Type and flags
142 Should NOT be modified except by the vout thread */
144 int64_t i_order; /** an increasing unique number */
145 subpicture_t * p_next; /**< next subtitle to be displayed */
148 subpicture_region_t *p_region; /**< region list composing this subtitle */
150 /** \name Date properties */
152 mtime_t i_start; /**< beginning of display date */
153 mtime_t i_stop; /**< end of display date */
154 bool b_ephemer; /**< If this flag is set to true the subtitle
155 will be displayed untill the next one appear */
156 bool b_fade; /**< enable fading */
159 /** \name Display properties
160 * These properties are only indicative and may be
161 * changed by the video output thread, or simply ignored depending of the
164 bool b_subtitle; /**< the picture is a movie subtitle */
165 bool b_absolute; /**< position is absolute */
166 int i_original_picture_width; /**< original width of the movie */
167 int i_original_picture_height;/**< original height of the movie */
168 int i_alpha; /**< transparency */
171 subpicture_updater_t updater;
173 subpicture_private_t *p_private; /* Reserved to the core */
177 * This function create a new empty subpicture.
179 * You must use subpicture_Delete to destroy it.
181 VLC_EXPORT( subpicture_t *, subpicture_New, ( const subpicture_updater_t * ) );
184 * This function delete a subpicture created by subpicture_New.
185 * You may give it NULL.
187 VLC_EXPORT( void, subpicture_Delete, ( subpicture_t *p_subpic ) );
190 * This function will create a subpicture having one region in the requested
191 * chroma showing the given picture.
193 * The picture_t given is not released nor used inside the
194 * returned subpicture_t.
196 VLC_EXPORT( subpicture_t *, subpicture_NewFromPicture, ( vlc_object_t *, picture_t *, vlc_fourcc_t i_chroma ) );
199 * This function will update the content of a subpicture created with
200 * a non NULL subpicture_updater_t.
202 VLC_EXPORT( void, subpicture_Update, ( subpicture_t *, const video_format_t *src, const video_format_t *, mtime_t ) );
206 #endif /* _VLC_VIDEO_H */