include/vlc_video_splitter.h

   1 /*****************************************************************************
   2  * vlc_video_splitter.h: "video splitter" related structures and functions
   3  *****************************************************************************
   4  * Copyright (C) 2009 Laurent Aimar
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 #ifndef VLC_VIDEO_SPLITTER_H
  25 #define VLC_VIDEO_SPLITTER_H 1
  26
  27 #include <vlc_es.h>
  28 #include <vlc_picture.h>
  29 #include <vlc_mouse.h>
  30
  31 /**
  32  * \file
  33  * This file defines the structure and types used by video splitter filters.
  34  */
  35
  36 typedef struct video_splitter_t video_splitter_t;
  37 typedef struct video_splitter_sys_t video_splitter_sys_t;
  38 typedef struct video_splitter_owner_t video_splitter_owner_t;
  39
  40 /** Structure describing a video splitter output properties
  41  */
  42 typedef struct
  43 {
  44     /* Video format of the output */
  45     video_format_t fmt;
  46
  47     /* Window hints */
  48     struct
  49     {
  50         /* Relative position.
  51          * (0,0) is equal to the default position.
  52          */
  53         int i_x;
  54         int i_y;
  55
  56         /* Alignment inside the window
  57          */
  58         int i_align;
  59     } window;
  60
  61     /* Video output module
  62      * Use NULL for default
  63      */
  64     char *psz_module;
  65
  66 } video_splitter_output_t;
  67
  68 /** Structure describing a video splitter
  69  */
  70 struct video_splitter_t
  71 {
  72     VLC_COMMON_MEMBERS
  73
  74     /* Module properties */
  75     module_t        *p_module;
  76
  77     /* configuration */
  78     config_chain_t  *p_cfg;
  79
  80     /* Input format
  81      * It is filled by the creator and cannot be modified.
  82      */
  83     video_format_t  fmt;
  84
  85     /* Output formats
  86      *
  87      * It can only be set in the open() function and must remain
  88      * constant.
  89      * The module is responsible for the allocation and deallocation.
  90      */
  91     int                     i_output;
  92     video_splitter_output_t *p_output;
  93
  94     int             (*pf_filter)( video_splitter_t *, picture_t *pp_dst[],
  95                                   picture_t *p_src );
  96     int             (*pf_mouse) ( video_splitter_t *, vlc_mouse_t *,
  97                                   int i_index,
  98                                   const vlc_mouse_t *p_old, const vlc_mouse_t *p_new );
  99
 100     video_splitter_sys_t *p_sys;
 101
 102     /* Buffer allocation */
 103     int  (*pf_picture_new) ( video_splitter_t *, picture_t *pp_picture[] );
 104     void (*pf_picture_del) ( video_splitter_t *, picture_t *pp_picture[] );
 105     video_splitter_owner_t *p_owner;
 106 };
 107
 108 /**
 109  * It will create an array of pictures suitable as output.
 110  *
 111  * You must either returned them through pf_filter or by calling
 112  * video_splitter_DeletePicture.
 113  *
 114  * If VLC_SUCCESS is not returned, pp_picture values are undefined.
 115  */
 116 static inline int video_splitter_NewPicture( video_splitter_t *p_splitter,
 117                                              picture_t *pp_picture[] )
 118 {
 119     int i_ret = p_splitter->pf_picture_new( p_splitter, pp_picture );
 120     if( i_ret )
 121         msg_Warn( p_splitter, "can't get output pictures" );
 122     return i_ret;
 123 }
 124
 125 /**
 126  * It will release an array of pictures created by video_splitter_NewPicture.
 127  * Provided for convenience.
 128  */
 129 static inline void video_splitter_DeletePicture( video_splitter_t *p_splitter,
 130                                                  picture_t *pp_picture[] )
 131 {
 132     p_splitter->pf_picture_del( p_splitter, pp_picture );
 133 }
 134
 135 /* */
 136 VLC_EXPORT( video_splitter_t *, video_splitter_New, ( vlc_object_t *, const char *psz_name, const video_format_t * ) );
 137 VLC_EXPORT( void, video_splitter_Delete, ( video_splitter_t * ) );
 138
 139 static inline int video_splitter_Filter( video_splitter_t *p_splitter,
 140                                          picture_t *pp_dst[], picture_t *p_src )
 141 {
 142     return p_splitter->pf_filter( p_splitter, pp_dst, p_src );
 143 }
 144 static inline int video_splitter_Mouse( video_splitter_t *p_splitter,
 145                                         vlc_mouse_t *p_mouse,
 146                                         int i_index,
 147                                         const vlc_mouse_t *p_old, const vlc_mouse_t *p_new )
 148 {
 149     if( !p_splitter->pf_mouse )
 150     {
 151         *p_mouse = *p_new;
 152         return VLC_SUCCESS;
 153     }
 154     return p_splitter->pf_mouse( p_splitter, p_mouse, i_index, p_old, p_new );
 155 }
 156
 157 #endif /* VLC_VIDEO_SPLITTER_H */
 158