include/vlc_picture.h

   1 /*****************************************************************************
   2  * vlc_picture.h: picture 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_PICTURE_H
  27 #define VLC_PICTURE_H 1
  28
  29 /**
  30  * \file
  31  * This file defines picture structures and functions in vlc
  32  */
  33
  34 #include <vlc_es.h>
  35 #include <vlc_atomic.h>
  36
  37 /** Description of a planar graphic field */
  38 typedef struct plane_t
  39 {
  40     uint8_t *p_pixels;                        /**< Start of the plane's data */
  41
  42     /* Variables used for fast memcpy operations */
  43     int i_lines;           /**< Number of lines, including margins */
  44     int i_pitch;           /**< Number of bytes in a line, including margins */
  45
  46     /** Size of a macropixel, defaults to 1 */
  47     int i_pixel_pitch;
  48
  49     /* Variables used for pictures with margins */
  50     int i_visible_lines;            /**< How many visible lines are there ? */
  51     int i_visible_pitch;            /**< How many visible pixels are there ? */
  52
  53 } plane_t;
  54
  55 /**
  56  * Maximum number of plane for a picture
  57  */
  58 #define PICTURE_PLANE_MAX (VOUT_MAX_PLANES)
  59
  60
  61 /**
  62  * A private definition to help overloading picture release
  63  */
  64 typedef struct picture_gc_sys_t picture_gc_sys_t;
  65
  66 /**
  67  * Video picture
  68  */
  69 struct picture_t
  70 {
  71     /**
  72      * The properties of the picture
  73      */
  74     video_frame_format_t format;
  75
  76     plane_t         p[PICTURE_PLANE_MAX];     /**< description of the planes */
  77     int             i_planes;                /**< number of allocated planes */
  78
  79     /** \name Picture management properties
  80      * These properties can be modified using the video output thread API,
  81      * but should never be written directly */
  82     /**@{*/
  83     mtime_t         date;                                  /**< display date */
  84     bool            b_force;
  85     /**@}*/
  86
  87     /** \name Picture dynamic properties
  88      * Those properties can be changed by the decoder
  89      * @{
  90      */
  91     bool            b_progressive;          /**< is it a progressive frame ? */
  92     bool            b_top_field_first;             /**< which field is first */
  93     unsigned int    i_nb_fields;                  /**< # of displayed fields */
  94     void          * context;          /**< video format-specific data pointer,
  95              * must point to a (void (*)(void*)) pointer to free the context */
  96     /**@}*/
  97
  98     /** Private data - the video output plugin might want to put stuff here to
  99      * keep track of the picture */
 100     picture_sys_t * p_sys;
 101
 102     /** This way the picture_Release can be overloaded */
 103     struct
 104     {
 105         atomic_uintptr_t refcount;
 106         void (*pf_destroy)( picture_t * );
 107         picture_gc_sys_t *p_sys;
 108     } gc;
 109
 110     /** Next picture in a FIFO a pictures */
 111     struct picture_t *p_next;
 112 };
 113
 114 /**
 115  * This function will create a new picture.
 116  * The picture created will implement a default release management compatible
 117  * with picture_Hold and picture_Release. This default management will release
 118  * p_sys, gc.p_sys fields if non NULL.
 119  */
 120 VLC_API picture_t * picture_New( vlc_fourcc_t i_chroma, int i_width, int i_height, int i_sar_num, int i_sar_den ) VLC_USED;
 121
 122 /**
 123  * This function will create a new picture using the given format.
 124  *
 125  * When possible, it is preferred to use this function over picture_New
 126  * as more information about the format is kept.
 127  */
 128 VLC_API picture_t * picture_NewFromFormat( const video_format_t *p_fmt ) VLC_USED;
 129
 130 /**
 131  * Resource for a picture.
 132  */
 133 typedef struct
 134 {
 135     picture_sys_t *p_sys;
 136     void (*pf_destroy)(picture_t *);
 137
 138     /* Plane resources
 139      * XXX all fields MUST be set to the right value.
 140      */
 141     struct
 142     {
 143         uint8_t *p_pixels;  /**< Start of the plane's data */
 144         int i_lines;        /**< Number of lines, including margins */
 145         int i_pitch;        /**< Number of bytes in a line, including margins */
 146     } p[PICTURE_PLANE_MAX];
 147
 148 } picture_resource_t;
 149
 150 /**
 151  * This function will create a new picture using the provided resource.
 152  *
 153  * If the resource is NULL then a plain picture_NewFromFormat is returned.
 154  */
 155 VLC_API picture_t * picture_NewFromResource( const video_format_t *, const picture_resource_t * ) VLC_USED;
 156
 157 /**
 158  * This function will increase the picture reference count.
 159  * It will not have any effect on picture obtained from vout
 160  *
 161  * It returns the given picture for convenience.
 162  */
 163 VLC_API picture_t *picture_Hold( picture_t *p_picture );
 164
 165 /**
 166  * This function will release a picture.
 167  * It will not have any effect on picture obtained from vout
 168  */
 169 VLC_API void picture_Release( picture_t *p_picture );
 170
 171 /**
 172  * This function will return true if you are not the only owner of the
 173  * picture.
 174  *
 175  * It is only valid if it is created using picture_New.
 176  */
 177 VLC_API bool picture_IsReferenced( picture_t *p_picture );
 178
 179 /**
 180  * This function will copy all picture dynamic properties.
 181  */
 182 VLC_API void picture_CopyProperties( picture_t *p_dst, const picture_t *p_src );
 183
 184 /**
 185  * This function will reset a picture information (properties and quantizers).
 186  * It is sometimes useful for reusing pictures (like from a pool).
 187  */
 188 VLC_API void picture_Reset( picture_t * );
 189
 190 /**
 191  * This function will copy the picture pixels.
 192  * You can safely copy between pictures that do not have the same size,
 193  * only the compatible(smaller) part will be copied.
 194  */
 195 VLC_API void picture_CopyPixels( picture_t *p_dst, const picture_t *p_src );
 196 VLC_API void plane_CopyPixels( plane_t *p_dst, const plane_t *p_src );
 197
 198 /**
 199  * This function will copy both picture dynamic properties and pixels.
 200  * You have to notice that sometime a simple picture_Hold may do what
 201  * you want without the copy overhead.
 202  * Provided for convenience.
 203  *
 204  * \param p_dst pointer to the destination picture.
 205  * \param p_src pointer to the source picture.
 206  */
 207 VLC_API void picture_Copy( picture_t *p_dst, const picture_t *p_src );
 208
 209 /**
 210  * This function will export a picture to an encoded bitstream.
 211  *
 212  * pp_image will contain the encoded bitstream in psz_format format.
 213  *
 214  * p_fmt can be NULL otherwise it will be set with the format used for the
 215  * picture before encoding.
 216  *
 217  * i_override_width/height allow to override the width and/or the height of the
 218  * picture to be encoded:
 219  *  - if strictly lower than 0, the original dimension will be used.
 220  *  - if equal to 0, it will be deduced from the other dimension which must be
 221  *  different to 0.
 222  *  - if strictly higher than 0, it will override the dimension.
 223  * If at most one of them is > 0 then the picture aspect ratio will be kept.
 224  */
 225 VLC_API int picture_Export( vlc_object_t *p_obj, block_t **pp_image, video_format_t *p_fmt, picture_t *p_picture, vlc_fourcc_t i_format, int i_override_width, int i_override_height );
 226
 227 /**
 228  * This function will setup all fields of a picture_t without allocating any
 229  * memory.
 230  * XXX The memory must already be initialized.
 231  * It does not need to be released.
 232  *
 233  * It will return VLC_EGENERIC if the core does not understand the requested
 234  * format.
 235  *
 236  * It can be useful to get the properties of planes.
 237  */
 238 VLC_API int picture_Setup( picture_t *, const video_format_t * );
 239
 240
 241 /**
 242  * This function will blend a given subpicture onto a picture.
 243  *
 244  * The subpicture and all its region must:
 245  *  - be absolute.
 246  *  - not be ephemere.
 247  *  - not have the fade flag.
 248  *  - contains only picture (no text rendering).
 249  * \return the number of region(s) succesfully blent
 250  */
 251 VLC_API unsigned picture_BlendSubpicture( picture_t *, filter_t *p_blend, subpicture_t * );
 252
 253
 254 /*****************************************************************************
 255  * Shortcuts to access image components
 256  *****************************************************************************/
 257
 258 /* Plane indices */
 259 enum
 260 {
 261     Y_PLANE = 0,
 262     U_PLANE = 1,
 263     V_PLANE = 2,
 264     A_PLANE = 3,
 265 };
 266
 267 /* Shortcuts */
 268 #define Y_PIXELS     p[Y_PLANE].p_pixels
 269 #define Y_PITCH      p[Y_PLANE].i_pitch
 270 #define U_PIXELS     p[U_PLANE].p_pixels
 271 #define U_PITCH      p[U_PLANE].i_pitch
 272 #define V_PIXELS     p[V_PLANE].p_pixels
 273 #define V_PITCH      p[V_PLANE].i_pitch
 274 #define A_PIXELS     p[A_PLANE].p_pixels
 275 #define A_PITCH      p[A_PLANE].i_pitch
 276
 277 /**@}*/
 278
 279 #endif /* VLC_PICTURE_H */