include/vlc_subpicture.h

   1 /*****************************************************************************
   2  * vlc_subpicture.h: subpicture definitions
   3  *****************************************************************************
   4  * Copyright (C) 1999 - 2009 VLC authors and VideoLAN
   5  *
   6  * Authors: Vincent Seguin <seguin@via.ecp.fr>
   7  *          Samuel Hocevar <sam@via.ecp.fr>
   8  *          Olivier Aubert <oaubert 47 videolan d07 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_SUBPICTURE_H
  26 #define VLC_SUBPICTURE_H 1
  27
  28 /**
  29  */
  30
  31 #include <vlc_picture.h>
  32 #include <vlc_text_style.h>
  33
  34 /**
  35  * \defgroup subpicture Video sub-pictures
  36  * \ingroup video_output
  37  * Subpictures are pictures that should be displayed on top of the video, like
  38  * subtitles and OSD
  39  * @{
  40  * \file
  41  * Subpictures functions
  42  */
  43
  44 /**
  45  * Video subtitle region spu core private
  46  */
  47 typedef struct subpicture_region_private_t subpicture_region_private_t;
  48 typedef struct vlc_spu_highlight_t vlc_spu_highlight_t;
  49 typedef struct filter_t vlc_blender_t;
  50
  51 /**
  52  * Video subtitle region
  53  *
  54  * A subtitle region is defined by a picture (graphic) and its rendering
  55  * coordinates.
  56  * Subtitles contain a list of regions.
  57  */
  58 struct subpicture_region_t
  59 {
  60     video_format_t  fmt;                          /**< format of the picture */
  61     picture_t       *p_picture;          /**< picture comprising this region */
  62
  63     int             i_x;      /**< position of region, relative to alignment */
  64     int             i_y;      /**< position of region, relative to alignment */
  65     int             i_align;                  /**< alignment flags of region */
  66     int             i_alpha;                               /**< transparency */
  67
  68     /* Parameters for text regions (p_picture to be rendered) */
  69     text_segment_t  *p_text;         /**< subtitle text, made of a list of segments */
  70     int             i_text_align;    /**< alignment flags of region content */
  71     bool            b_noregionbg;    /**< render background under text only */
  72     bool            b_gridmode;      /** if the decoder sends row/cols based output */
  73     bool            b_balanced_text; /** try to balance wrapped text lines */
  74     int             i_max_width;     /** horizontal rendering/cropping target/limit */
  75     int             i_max_height;    /** vertical rendering/cropping target/limit */
  76
  77     vlc_rational_t  zoom_h;
  78     vlc_rational_t  zoom_v;
  79
  80     subpicture_region_t *p_next;                /**< next region in the list */
  81     subpicture_region_private_t *p_private;  /**< Private data for spu_t *only* */
  82 };
  83
  84 struct vlc_spu_highlight_t
  85 {
  86     int x_start;
  87     int x_end;
  88     int y_start;
  89     int y_end;
  90     video_palette_t palette;
  91 };
  92
  93 /* Subpicture region position flags */
  94 #define SUBPICTURE_ALIGN_LEFT       0x1
  95 #define SUBPICTURE_ALIGN_RIGHT      0x2
  96 #define SUBPICTURE_ALIGN_TOP        0x4
  97 #define SUBPICTURE_ALIGN_BOTTOM     0x8
  98 #define SUBPICTURE_ALIGN_MASK ( SUBPICTURE_ALIGN_LEFT|SUBPICTURE_ALIGN_RIGHT| \
  99                                 SUBPICTURE_ALIGN_TOP |SUBPICTURE_ALIGN_BOTTOM )
 100 /**
 101  * This function will create a new subpicture region.
 102  *
 103  * You must use subpicture_region_Delete to destroy it.
 104  */
 105 VLC_API subpicture_region_t * subpicture_region_New( const video_format_t *p_fmt );
 106
 107 /**
 108  * This function will destroy a subpicture region allocated by
 109  * subpicture_region_New.
 110  *
 111  * You may give it NULL.
 112  */
 113 VLC_API void subpicture_region_Delete( subpicture_region_t *p_region );
 114
 115 /**
 116  * This function will destroy a list of subpicture regions allocated by
 117  * subpicture_region_New.
 118  *
 119  * Provided for convenience.
 120  */
 121 VLC_API void subpicture_region_ChainDelete( subpicture_region_t *p_head );
 122
 123 /**
 124  * This function will copy a subpicture region to a new allocated one
 125  * and transfer all the properties
 126  *
 127  * Provided for convenience.
 128  */
 129 VLC_API subpicture_region_t *subpicture_region_Copy( subpicture_region_t *p_region );
 130
 131 /**
 132  *
 133  */
 134 typedef struct
 135 {
 136     /** Optional pre update callback, usually useful on video format change.
 137       * Will skip pf_update on VLC_SUCCESS, or will delete every region before
 138       * the call to pf_update */
 139     int  (*pf_validate)( subpicture_t *,
 140                          bool has_src_changed, const video_format_t *p_fmt_src,
 141                          bool has_dst_changed, const video_format_t *p_fmt_dst,
 142                          vlc_tick_t);
 143     /** Mandatory callback called after pf_validate and doing
 144       * the main job of creating the subpicture regions for the
 145       * current video_format */
 146     void (*pf_update)  ( subpicture_t *,
 147                          const video_format_t *p_fmt_src,
 148                          const video_format_t *p_fmt_dst,
 149                          vlc_tick_t );
 150     /** Optional callback for subpicture private data cleanup */
 151     void (*pf_destroy) ( subpicture_t * );
 152     void *p_sys;
 153 } subpicture_updater_t;
 154
 155 typedef struct subpicture_private_t subpicture_private_t;
 156
 157 /**
 158  * Video subtitle
 159  *
 160  * Any subtitle destined to be displayed by a video output thread should
 161  * be stored in this structure from it's creation to it's effective display.
 162  * Subtitle type and flags should only be modified by the output thread. Note
 163  * that an empty subtitle MUST have its flags set to 0.
 164  */
 165 struct subpicture_t
 166 {
 167     /** \name Channel ID */
 168     /**@{*/
 169     ssize_t         i_channel;                    /**< subpicture channel ID */
 170     /**@}*/
 171
 172     /** \name Type and flags
 173        Should NOT be modified except by the vout thread */
 174     /**@{*/
 175     int64_t         i_order;                 /** an increasing unique number */
 176     subpicture_t *  p_next;               /**< next subtitle to be displayed */
 177     /**@}*/
 178
 179     subpicture_region_t *p_region;  /**< region list composing this subtitle */
 180
 181     /** \name Date properties */
 182     /**@{*/
 183     vlc_tick_t      i_start;                  /**< beginning of display date */
 184     vlc_tick_t      i_stop;                         /**< end of display date */
 185     bool            b_ephemer;    /**< If this flag is set to true the subtitle
 186                                 will be displayed until the next one appear */
 187     bool            b_fade;                               /**< enable fading */
 188     /**@}*/
 189
 190     /** \name Display properties
 191      * These properties are only indicative and may be
 192      * changed by the video output thread, or simply ignored depending of the
 193      * subtitle type. */
 194     /**@{*/
 195     bool         b_subtitle;            /**< the picture is a movie subtitle */
 196     bool         b_absolute;                       /**< position is absolute */
 197     int          i_original_picture_width;  /**< original width of the movie */
 198     int          i_original_picture_height;/**< original height of the movie */
 199     int          i_alpha;                                  /**< transparency */
 200      /**@}*/
 201
 202     subpicture_updater_t updater;
 203
 204     subpicture_private_t *p_private;    /* Reserved to the core */
 205 };
 206
 207 /**
 208  * This function create a new empty subpicture.
 209  *
 210  * You must use subpicture_Delete to destroy it.
 211  */
 212 VLC_API subpicture_t * subpicture_New( const subpicture_updater_t * );
 213
 214 /**
 215  * This function delete a subpicture created by subpicture_New.
 216  * You may give it NULL.
 217  */
 218 VLC_API void subpicture_Delete( subpicture_t *p_subpic );
 219
 220 /**
 221  * This function will create a subpicture having one region in the requested
 222  * chroma showing the given picture.
 223  *
 224  * The picture_t given is not released nor used inside the
 225  * returned subpicture_t.
 226  */
 227 VLC_API subpicture_t * subpicture_NewFromPicture( vlc_object_t *, picture_t *, vlc_fourcc_t i_chroma );
 228
 229 /**
 230  * This function will update the content of a subpicture created with
 231  * a non NULL subpicture_updater_t.
 232  */
 233 VLC_API void subpicture_Update( subpicture_t *, const video_format_t *src, const video_format_t *, vlc_tick_t );
 234
 235 /**
 236  * This function will blend a given subpicture onto a picture.
 237  *
 238  * The subpicture and all its region must:
 239  *  - be absolute.
 240  *  - not be ephemere.
 241  *  - not have the fade flag.
 242  *  - contains only picture (no text rendering).
 243  * \return the number of region(s) successfully blent
 244  */
 245 VLC_API unsigned picture_BlendSubpicture( picture_t *, vlc_blender_t *, subpicture_t * );
 246
 247 /**@}*/
 248
 249 #endif /* _VLC_SUBPICTURE_H */