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, relative to alignment */
  63     int             i_y;      /**< position of region, relative to alignment */
  64     int             i_align;                  /**< alignment flags of region */
  65     int             i_alpha;                               /**< transparency */
  66
  67     /* Parameters for text regions (p_picture to be rendered) */
  68     text_segment_t  *p_text;         /**< subtitle text, made of a list of segments */
  69     int             i_text_align;    /**< alignment flags of region content */
  70     bool            b_noregionbg;    /**< render background under text only */
  71     bool            b_gridmode;      /** if the decoder sends row/cols based output */
  72     bool            b_balanced_text; /** try to balance wrapped text lines */
  73     int             i_max_width;     /** horizontal rendering/cropping target/limit */
  74     int             i_max_height;    /** vertical rendering/cropping target/limit */
  75
  76     subpicture_region_t *p_next;                /**< next region in the list */
  77     subpicture_region_private_t *p_private;  /**< Private data for spu_t *only* */
  78 };
  79
  80 /* Subpicture region position flags */
  81 #define SUBPICTURE_ALIGN_LEFT       0x1
  82 #define SUBPICTURE_ALIGN_RIGHT      0x2
  83 #define SUBPICTURE_ALIGN_TOP        0x4
  84 #define SUBPICTURE_ALIGN_BOTTOM     0x8
  85 #define SUBPICTURE_ALIGN_MASK ( SUBPICTURE_ALIGN_LEFT|SUBPICTURE_ALIGN_RIGHT| \
  86                                 SUBPICTURE_ALIGN_TOP |SUBPICTURE_ALIGN_BOTTOM )
  87 /**
  88  * This function will create a new subpicture region.
  89  *
  90  * You must use subpicture_region_Delete to destroy it.
  91  */
  92 VLC_API subpicture_region_t * subpicture_region_New( const video_format_t *p_fmt );
  93
  94 /**
  95  * This function will destroy a subpicture region allocated by
  96  * subpicture_region_New.
  97  *
  98  * You may give it NULL.
  99  */
 100 VLC_API void subpicture_region_Delete( subpicture_region_t *p_region );
 101
 102 /**
 103  * This function will destroy a list of subpicture regions allocated by
 104  * subpicture_region_New.
 105  *
 106  * Provided for convenience.
 107  */
 108 VLC_API void subpicture_region_ChainDelete( subpicture_region_t *p_head );
 109
 110 /**
 111  * This function will copy a subpicture region to a new allocated one
 112  * and transfer all the properties
 113  *
 114  * Provided for convenience.
 115  */
 116 VLC_API subpicture_region_t *subpicture_region_Copy( subpicture_region_t *p_region );
 117
 118 /**
 119  *
 120  */
 121 typedef struct subpicture_updater_sys_t subpicture_updater_sys_t;
 122 typedef struct
 123 {
 124     /** Optional pre update callback, usually useful on video format change.
 125       * Will skip pf_update on VLC_SUCCESS, or will delete every region before
 126       * the call to pf_update */
 127     int  (*pf_validate)( subpicture_t *,
 128                          bool has_src_changed, const video_format_t *p_fmt_src,
 129                          bool has_dst_changed, const video_format_t *p_fmt_dst,
 130                          mtime_t);
 131     /** Mandatory callback called after pf_validate and doing
 132       * the main job of creating the subpicture regions for the
 133       * current video_format */
 134     void (*pf_update)  ( subpicture_t *,
 135                          const video_format_t *p_fmt_src,
 136                          const video_format_t *p_fmt_dst,
 137                          mtime_t );
 138     /** Optional callback for subpicture private data cleanup */
 139     void (*pf_destroy) ( subpicture_t * );
 140     subpicture_updater_sys_t *p_sys;
 141 } subpicture_updater_t;
 142
 143 typedef struct subpicture_private_t subpicture_private_t;
 144
 145 /**
 146  * Video subtitle
 147  *
 148  * Any subtitle destined to be displayed by a video output thread should
 149  * be stored in this structure from it's creation to it's effective display.
 150  * Subtitle type and flags should only be modified by the output thread. Note
 151  * that an empty subtitle MUST have its flags set to 0.
 152  */
 153 struct subpicture_t
 154 {
 155     /** \name Channel ID */
 156     /**@{*/
 157     int             i_channel;                    /**< subpicture channel ID */
 158     /**@}*/
 159
 160     /** \name Type and flags
 161        Should NOT be modified except by the vout thread */
 162     /**@{*/
 163     int64_t         i_order;                 /** an increasing unique number */
 164     subpicture_t *  p_next;               /**< next subtitle to be displayed */
 165     /**@}*/
 166
 167     subpicture_region_t *p_region;  /**< region list composing this subtitle */
 168
 169     /** \name Date properties */
 170     /**@{*/
 171     mtime_t         i_start;                  /**< beginning of display date */
 172     mtime_t         i_stop;                         /**< end of display date */
 173     bool            b_ephemer;    /**< If this flag is set to true the subtitle
 174                                 will be displayed until the next one appear */
 175     bool            b_fade;                               /**< enable fading */
 176     /**@}*/
 177
 178     /** \name Display properties
 179      * These properties are only indicative and may be
 180      * changed by the video output thread, or simply ignored depending of the
 181      * subtitle type. */
 182     /**@{*/
 183     bool         b_subtitle;            /**< the picture is a movie subtitle */
 184     bool         b_absolute;                       /**< position is absolute */
 185     int          i_original_picture_width;  /**< original width of the movie */
 186     int          i_original_picture_height;/**< original height of the movie */
 187     int          i_alpha;                                  /**< transparency */
 188      /**@}*/
 189
 190     subpicture_updater_t updater;
 191
 192     subpicture_private_t *p_private;    /* Reserved to the core */
 193 };
 194
 195 /**
 196  * This function create a new empty subpicture.
 197  *
 198  * You must use subpicture_Delete to destroy it.
 199  */
 200 VLC_API subpicture_t * subpicture_New( const subpicture_updater_t * );
 201
 202 /**
 203  * This function delete a subpicture created by subpicture_New.
 204  * You may give it NULL.
 205  */
 206 VLC_API void subpicture_Delete( subpicture_t *p_subpic );
 207
 208 /**
 209  * This function will create a subpicture having one region in the requested
 210  * chroma showing the given picture.
 211  *
 212  * The picture_t given is not released nor used inside the
 213  * returned subpicture_t.
 214  */
 215 VLC_API subpicture_t * subpicture_NewFromPicture( vlc_object_t *, picture_t *, vlc_fourcc_t i_chroma );
 216
 217 /**
 218  * This function will update the content of a subpicture created with
 219  * a non NULL subpicture_updater_t.
 220  */
 221 VLC_API void subpicture_Update( subpicture_t *, const video_format_t *src, const video_format_t *, mtime_t );
 222
 223 /**
 224  * This function will blend a given subpicture onto a picture.
 225  *
 226  * The subpicture and all its region must:
 227  *  - be absolute.
 228  *  - not be ephemere.
 229  *  - not have the fade flag.
 230  *  - contains only picture (no text rendering).
 231  * \return the number of region(s) successfully blent
 232  */
 233 VLC_API unsigned picture_BlendSubpicture( picture_t *, filter_t *p_blend, subpicture_t * );
 234
 235 /**@}*/
 236
 237 #endif /* _VLC_VIDEO_H */