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 typedef struct vlc_spu_highlight_t vlc_spu_highlight_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     subpicture_region_t *p_next;                /**< next region in the list */
  78     subpicture_region_private_t *p_private;  /**< Private data for spu_t *only* */
  79 };
  80
  81 struct vlc_spu_highlight_t
  82 {
  83     int x_start;
  84     int x_end;
  85     int y_start;
  86     int y_end;
  87     video_palette_t palette;
  88 };
  89
  90 /* Subpicture region position flags */
  91 #define SUBPICTURE_ALIGN_LEFT       0x1
  92 #define SUBPICTURE_ALIGN_RIGHT      0x2
  93 #define SUBPICTURE_ALIGN_TOP        0x4
  94 #define SUBPICTURE_ALIGN_BOTTOM     0x8
  95 #define SUBPICTURE_ALIGN_MASK ( SUBPICTURE_ALIGN_LEFT|SUBPICTURE_ALIGN_RIGHT| \
  96                                 SUBPICTURE_ALIGN_TOP |SUBPICTURE_ALIGN_BOTTOM )
  97 /**
  98  * This function will create a new subpicture region.
  99  *
 100  * You must use subpicture_region_Delete to destroy it.
 101  */
 102 VLC_API subpicture_region_t * subpicture_region_New( const video_format_t *p_fmt );
 103
 104 /**
 105  * This function will destroy a subpicture region allocated by
 106  * subpicture_region_New.
 107  *
 108  * You may give it NULL.
 109  */
 110 VLC_API void subpicture_region_Delete( subpicture_region_t *p_region );
 111
 112 /**
 113  * This function will destroy a list of subpicture regions allocated by
 114  * subpicture_region_New.
 115  *
 116  * Provided for convenience.
 117  */
 118 VLC_API void subpicture_region_ChainDelete( subpicture_region_t *p_head );
 119
 120 /**
 121  * This function will copy a subpicture region to a new allocated one
 122  * and transfer all the properties
 123  *
 124  * Provided for convenience.
 125  */
 126 VLC_API subpicture_region_t *subpicture_region_Copy( subpicture_region_t *p_region );
 127
 128 /**
 129  *
 130  */
 131 typedef struct
 132 {
 133     /** Optional pre update callback, usually useful on video format change.
 134       * Will skip pf_update on VLC_SUCCESS, or will delete every region before
 135       * the call to pf_update */
 136     int  (*pf_validate)( subpicture_t *,
 137                          bool has_src_changed, const video_format_t *p_fmt_src,
 138                          bool has_dst_changed, const video_format_t *p_fmt_dst,
 139                          vlc_tick_t);
 140     /** Mandatory callback called after pf_validate and doing
 141       * the main job of creating the subpicture regions for the
 142       * current video_format */
 143     void (*pf_update)  ( subpicture_t *,
 144                          const video_format_t *p_fmt_src,
 145                          const video_format_t *p_fmt_dst,
 146                          vlc_tick_t );
 147     /** Optional callback for subpicture private data cleanup */
 148     void (*pf_destroy) ( subpicture_t * );
 149     void *p_sys;
 150 } subpicture_updater_t;
 151
 152 typedef struct subpicture_private_t subpicture_private_t;
 153
 154 /**
 155  * Video subtitle
 156  *
 157  * Any subtitle destined to be displayed by a video output thread should
 158  * be stored in this structure from it's creation to it's effective display.
 159  * Subtitle type and flags should only be modified by the output thread. Note
 160  * that an empty subtitle MUST have its flags set to 0.
 161  */
 162 struct subpicture_t
 163 {
 164     /** \name Channel ID */
 165     /**@{*/
 166     int             i_channel;                    /**< subpicture channel ID */
 167     /**@}*/
 168
 169     /** \name Type and flags
 170        Should NOT be modified except by the vout thread */
 171     /**@{*/
 172     int64_t         i_order;                 /** an increasing unique number */
 173     subpicture_t *  p_next;               /**< next subtitle to be displayed */
 174     /**@}*/
 175
 176     subpicture_region_t *p_region;  /**< region list composing this subtitle */
 177
 178     /** \name Date properties */
 179     /**@{*/
 180     vlc_tick_t      i_start;                  /**< beginning of display date */
 181     vlc_tick_t      i_stop;                         /**< end of display date */
 182     bool            b_ephemer;    /**< If this flag is set to true the subtitle
 183                                 will be displayed until the next one appear */
 184     bool            b_fade;                               /**< enable fading */
 185     /**@}*/
 186
 187     /** \name Display properties
 188      * These properties are only indicative and may be
 189      * changed by the video output thread, or simply ignored depending of the
 190      * subtitle type. */
 191     /**@{*/
 192     bool         b_subtitle;            /**< the picture is a movie subtitle */
 193     bool         b_absolute;                       /**< position is absolute */
 194     int          i_original_picture_width;  /**< original width of the movie */
 195     int          i_original_picture_height;/**< original height of the movie */
 196     int          i_alpha;                                  /**< transparency */
 197      /**@}*/
 198
 199     subpicture_updater_t updater;
 200
 201     subpicture_private_t *p_private;    /* Reserved to the core */
 202 };
 203
 204 /**
 205  * This function create a new empty subpicture.
 206  *
 207  * You must use subpicture_Delete to destroy it.
 208  */
 209 VLC_API subpicture_t * subpicture_New( const subpicture_updater_t * );
 210
 211 /**
 212  * This function delete a subpicture created by subpicture_New.
 213  * You may give it NULL.
 214  */
 215 VLC_API void subpicture_Delete( subpicture_t *p_subpic );
 216
 217 /**
 218  * This function will create a subpicture having one region in the requested
 219  * chroma showing the given picture.
 220  *
 221  * The picture_t given is not released nor used inside the
 222  * returned subpicture_t.
 223  */
 224 VLC_API subpicture_t * subpicture_NewFromPicture( vlc_object_t *, picture_t *, vlc_fourcc_t i_chroma );
 225
 226 /**
 227  * This function will update the content of a subpicture created with
 228  * a non NULL subpicture_updater_t.
 229  */
 230 VLC_API void subpicture_Update( subpicture_t *, const video_format_t *src, const video_format_t *, vlc_tick_t );
 231
 232 /**
 233  * This function will blend a given subpicture onto a picture.
 234  *
 235  * The subpicture and all its region must:
 236  *  - be absolute.
 237  *  - not be ephemere.
 238  *  - not have the fade flag.
 239  *  - contains only picture (no text rendering).
 240  * \return the number of region(s) successfully blent
 241  */
 242 VLC_API unsigned picture_BlendSubpicture( picture_t *, filter_t *p_blend, subpicture_t * );
 243
 244 /**@}*/
 245
 246 #endif /* _VLC_SUBPICTURE_H */