include/vlc_subpicture.h

   1 /*****************************************************************************
   2  * vlc_subpicture.h: subpicture definitions
   3  *****************************************************************************
   4  * Copyright (C) 1999 - 2009 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Vincent Seguin <seguin@via.ecp.fr>
   8  *          Samuel Hocevar <sam@via.ecp.fr>
   9  *          Olivier Aubert <oaubert 47 videolan d07 org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify it
  12  * under the terms of the GNU Lesser General Public License as published by
  13  * the Free Software Foundation; either version 2.1 of the License, or
  14  * (at your option) any later version.
  15  *
  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 Lesser General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU Lesser General Public License
  22  * along with this program; if not, write to the Free Software Foundation,
  23  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  24  *****************************************************************************/
  25
  26 #ifndef VLC_SUBPICTURE_H
  27 #define VLC_SUBPICTURE_H 1
  28
  29 /**
  30  */
  31
  32 #include <vlc_picture.h>
  33 #include <vlc_text_style.h>
  34
  35 /**
  36  * \defgroup subpicture Video sub-pictures
  37  * \ingroup video_output
  38  * Subpictures are pictures that should be displayed on top of the video, like
  39  * subtitles and OSD
  40  * @{
  41  * \file
  42  * Subpictures functions
  43  */
  44
  45 /**
  46  * Video subtitle region spu core private
  47  */
  48 typedef struct subpicture_region_private_t subpicture_region_private_t;
  49
  50 /**
  51  * Video subtitle region
  52  *
  53  * A subtitle region is defined by a picture (graphic) and its rendering
  54  * coordinates.
  55  * Subtitles contain a list of regions.
  56  */
  57 struct subpicture_region_t
  58 {
  59     video_format_t  fmt;                          /**< format of the picture */
  60     picture_t       *p_picture;          /**< picture comprising this region */
  61
  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 */
  66
  67     text_segment_t  *p_text;         /**< subtitle text, made of a list of segments */
  68     bool            b_noregionbg;    /**< render background under text only */
  69     bool            b_gridmode;      /** if the decoder sends row/cols based output */
  70
  71     subpicture_region_t *p_next;                /**< next region in the list */
  72     subpicture_region_private_t *p_private;  /**< Private data for spu_t *only* */
  73 };
  74
  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_LEAVETEXT  0x10 /**< Align the subpicture, but not the text inside */
  81 #define SUBPICTURE_ALIGN_MASK ( SUBPICTURE_ALIGN_LEFT|SUBPICTURE_ALIGN_RIGHT| \
  82                                 SUBPICTURE_ALIGN_TOP |SUBPICTURE_ALIGN_BOTTOM| \
  83                                 SUBPICTURE_ALIGN_LEAVETEXT )
  84 /**
  85  * This function will create a new subpicture region.
  86  *
  87  * You must use subpicture_region_Delete to destroy it.
  88  */
  89 VLC_API subpicture_region_t * subpicture_region_New( const video_format_t *p_fmt );
  90
  91 /**
  92  * This function will destroy a subpicture region allocated by
  93  * subpicture_region_New.
  94  *
  95  * You may give it NULL.
  96  */
  97 VLC_API void subpicture_region_Delete( subpicture_region_t *p_region );
  98
  99 /**
 100  * This function will destroy a list of subpicture regions allocated by
 101  * subpicture_region_New.
 102  *
 103  * Provided for convenience.
 104  */
 105 VLC_API void subpicture_region_ChainDelete( subpicture_region_t *p_head );
 106
 107 /**
 108  * This function will copy a subpicture region to a new allocated one
 109  * and transfer all the properties
 110  *
 111  * Provided for convenience.
 112  */
 113 VLC_API subpicture_region_t *subpicture_region_Copy( subpicture_region_t *p_region );
 114
 115 /**
 116  *
 117  */
 118 typedef struct subpicture_updater_sys_t subpicture_updater_sys_t;
 119 typedef struct
 120 {
 121     /** Optional pre update callback, usually useful on video format change.
 122       * Will skip pf_update on VLC_SUCCESS, or will delete every region before
 123       * the call to pf_update */
 124     int  (*pf_validate)( subpicture_t *,
 125                          bool has_src_changed, const video_format_t *p_fmt_src,
 126                          bool has_dst_changed, const video_format_t *p_fmt_dst,
 127                          mtime_t);
 128     /** Mandatory callback called after pf_validate and doing
 129       * the main job of creating the subpicture regions for the
 130       * current video_format */
 131     void (*pf_update)  ( subpicture_t *,
 132                          const video_format_t *p_fmt_src,
 133                          const video_format_t *p_fmt_dst,
 134                          mtime_t );
 135     /** Optional callback for subpicture private data cleanup */
 136     void (*pf_destroy) ( subpicture_t * );
 137     subpicture_updater_sys_t *p_sys;
 138 } subpicture_updater_t;
 139
 140 typedef struct subpicture_private_t subpicture_private_t;
 141
 142 /**
 143  * Video subtitle
 144  *
 145  * Any subtitle destined to be displayed by a video output thread should
 146  * be stored in this structure from it's creation to it's effective display.
 147  * Subtitle type and flags should only be modified by the output thread. Note
 148  * that an empty subtitle MUST have its flags set to 0.
 149  */
 150 struct subpicture_t
 151 {
 152     /** \name Channel ID */
 153     /**@{*/
 154     int             i_channel;                    /**< subpicture channel ID */
 155     /**@}*/
 156
 157     /** \name Type and flags
 158        Should NOT be modified except by the vout thread */
 159     /**@{*/
 160     int64_t         i_order;                 /** an increasing unique number */
 161     subpicture_t *  p_next;               /**< next subtitle to be displayed */
 162     /**@}*/
 163
 164     subpicture_region_t *p_region;  /**< region list composing this subtitle */
 165
 166     /** \name Date properties */
 167     /**@{*/
 168     mtime_t         i_start;                  /**< beginning of display date */
 169     mtime_t         i_stop;                         /**< end of display date */
 170     bool            b_ephemer;    /**< If this flag is set to true the subtitle
 171                                 will be displayed until the next one appear */
 172     bool            b_fade;                               /**< enable fading */
 173     /**@}*/
 174
 175     /** \name Display properties
 176      * These properties are only indicative and may be
 177      * changed by the video output thread, or simply ignored depending of the
 178      * subtitle type. */
 179     /**@{*/
 180     bool         b_subtitle;            /**< the picture is a movie subtitle */
 181     bool         b_absolute;                       /**< position is absolute */
 182     int          i_original_picture_width;  /**< original width of the movie */
 183     int          i_original_picture_height;/**< original height of the movie */
 184     int          i_alpha;                                  /**< transparency */
 185      /**@}*/
 186
 187     subpicture_updater_t updater;
 188
 189     subpicture_private_t *p_private;    /* Reserved to the core */
 190 };
 191
 192 /**
 193  * This function create a new empty subpicture.
 194  *
 195  * You must use subpicture_Delete to destroy it.
 196  */
 197 VLC_API subpicture_t * subpicture_New( const subpicture_updater_t * );
 198
 199 /**
 200  * This function delete a subpicture created by subpicture_New.
 201  * You may give it NULL.
 202  */
 203 VLC_API void subpicture_Delete( subpicture_t *p_subpic );
 204
 205 /**
 206  * This function will create a subpicture having one region in the requested
 207  * chroma showing the given picture.
 208  *
 209  * The picture_t given is not released nor used inside the
 210  * returned subpicture_t.
 211  */
 212 VLC_API subpicture_t * subpicture_NewFromPicture( vlc_object_t *, picture_t *, vlc_fourcc_t i_chroma );
 213
 214 /**
 215  * This function will update the content of a subpicture created with
 216  * a non NULL subpicture_updater_t.
 217  */
 218 VLC_API void subpicture_Update( subpicture_t *, const video_format_t *src, const video_format_t *, mtime_t );
 219
 220 /**
 221  * This function will blend a given subpicture onto a picture.
 222  *
 223  * The subpicture and all its region must:
 224  *  - be absolute.
 225  *  - not be ephemere.
 226  *  - not have the fade flag.
 227  *  - contains only picture (no text rendering).
 228  * \return the number of region(s) successfully blent
 229  */
 230 VLC_API unsigned picture_BlendSubpicture( picture_t *, filter_t *p_blend, subpicture_t * );
 231
 232 /**@}*/
 233
 234 #endif /* _VLC_VIDEO_H */