include/vlc_picture.h

   1 /*****************************************************************************
   2  * vlc_picture.h: picture definitions
   3  *****************************************************************************
   4  * Copyright (C) 1999 - 2009 the VideoLAN team
   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
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 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 General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, 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
  36 /** Description of a planar graphic field */
  37 typedef struct plane_t
  38 {
  39     uint8_t *p_pixels;                        /**< Start of the plane's data */
  40
  41     /* Variables used for fast memcpy operations */
  42     int i_lines;           /**< Number of lines, including margins */
  43     int i_pitch;           /**< Number of bytes in a line, including margins */
  44
  45     /** Size of a macropixel, defaults to 1 */
  46     int i_pixel_pitch;
  47
  48     /* Variables used for pictures with margins */
  49     int i_visible_lines;            /**< How many visible lines are there ? */
  50     int i_visible_pitch;            /**< How many visible pixels are there ? */
  51
  52 } plane_t;
  53
  54 /**
  55  * Maximum number of plane for a picture
  56  */
  57 #define PICTURE_PLANE_MAX (VOUT_MAX_PLANES)
  58
  59 /**
  60  * A private definition to help overloading picture release
  61  */
  62 typedef struct picture_release_sys_t picture_release_sys_t;
  63
  64 /**
  65  * Video picture
  66  */
  67 struct picture_t
  68 {
  69     /**
  70      * The properties of the picture
  71      */
  72     video_frame_format_t format;
  73
  74     void           *p_data_orig;                /**< pointer before memalign */
  75     plane_t         p[PICTURE_PLANE_MAX];     /**< description of the planes */
  76     int             i_planes;                /**< number of allocated planes */
  77
  78     /** \name Picture management properties
  79      * These properties can be modified using the video output thread API,
  80      * but should never be written directly */
  81     /**@{*/
  82     unsigned        i_refcount;                  /**< link reference counter */
  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     int8_t         *p_q;                           /**< quantification table */
  95     int             i_qstride;                    /**< quantification stride */
  96     int             i_qtype;                       /**< quantification style */
  97     /**@}*/
  98
  99     /** Private data - the video output plugin might want to put stuff here to
 100      * keep track of the picture */
 101     picture_sys_t * p_sys;
 102
 103     /** This way the picture_Release can be overloaded */
 104     void (*pf_release)( picture_t * );
 105     picture_release_sys_t *p_release_sys;
 106
 107     /** Next picture in a FIFO a pictures */
 108     struct picture_t *p_next;
 109 };
 110
 111 /**
 112  * This function will create a new picture.
 113  * The picture created will implement a default release management compatible
 114  * with picture_Hold and picture_Release. This default management will release
 115  * p_sys, p_q, p_data_orig fields if non NULL.
 116  */
 117 VLC_EXPORT( picture_t *, picture_New, ( vlc_fourcc_t i_chroma, int i_width, int i_height, int i_sar_num, int i_sar_den ) LIBVLC_USED );
 118
 119 /**
 120  * This function will create a new picture using the given format.
 121  *
 122  * When possible, it is preferred to use this function over picture_New
 123  * as more information about the format is kept.
 124  */
 125 VLC_EXPORT( picture_t *, picture_NewFromFormat, ( const video_format_t *p_fmt ) LIBVLC_USED );
 126
 127 /**
 128  * Resource for a picture.
 129  */
 130 typedef struct
 131 {
 132     picture_sys_t *p_sys;
 133
 134     /* Plane resources
 135      * XXX all fields MUST be set to the right value.
 136      */
 137     struct
 138     {
 139         uint8_t *p_pixels;  /**< Start of the plane's data */
 140         int i_lines;        /**< Number of lines, including margins */
 141         int i_pitch;        /**< Number of bytes in a line, including margins */
 142     } p[PICTURE_PLANE_MAX];
 143
 144 } picture_resource_t;
 145
 146 /**
 147  * This function will create a new picture using the provided resource.
 148  *
 149  * If the resource is NULL then a plain picture_NewFromFormat is returned.
 150  */
 151 VLC_EXPORT( picture_t *, picture_NewFromResource, ( const video_format_t *, const picture_resource_t * ) LIBVLC_USED );
 152
 153 /**
 154  * This function will force the destruction a picture.
 155  * The value of the picture reference count should be 0 before entering this
 156  * function.
 157  * Unless used for reimplementing pf_release, you should not use this
 158  * function but picture_Release.
 159  */
 160 VLC_EXPORT( void, picture_Delete, ( picture_t * ) );
 161
 162 /**
 163  * This function will increase the picture reference count.
 164  * It will not have any effect on picture obtained from vout
 165  *
 166  * It returns the given picture for convenience.
 167  */
 168 static inline picture_t *picture_Hold( picture_t *p_picture )
 169 {
 170     if( p_picture->pf_release )
 171         p_picture->i_refcount++;
 172     return p_picture;
 173 }
 174 /**
 175  * This function will release a picture.
 176  * It will not have any effect on picture obtained from vout
 177  */
 178 static inline void picture_Release( picture_t *p_picture )
 179 {
 180     /* FIXME why do we let pf_release handle the i_refcount ? */
 181     if( p_picture->pf_release )
 182         p_picture->pf_release( p_picture );
 183 }
 184
 185 /**
 186  * This function will return true if you are not the only owner of the
 187  * picture.
 188  *
 189  * It is only valid if it is created using picture_New.
 190  */
 191 static inline bool picture_IsReferenced( picture_t *p_picture )
 192 {
 193     return p_picture->i_refcount > 1;
 194 }
 195
 196 /**
 197  * Cleanup quantization matrix data and set to 0
 198  */
 199 static inline void picture_CleanupQuant( picture_t *p_pic )
 200 {
 201     free( p_pic->p_q );
 202     p_pic->p_q = NULL;
 203     p_pic->i_qstride = 0;
 204     p_pic->i_qtype = 0;
 205 }
 206
 207 /**
 208  * This function will copy all picture dynamic properties.
 209  */
 210 static inline void picture_CopyProperties( picture_t *p_dst, const picture_t *p_src )
 211 {
 212     p_dst->date = p_src->date;
 213     p_dst->b_force = p_src->b_force;
 214
 215     p_dst->b_progressive = p_src->b_progressive;
 216     p_dst->i_nb_fields = p_src->i_nb_fields;
 217     p_dst->b_top_field_first = p_src->b_top_field_first;
 218
 219     /* FIXME: copy ->p_q and ->p_qstride */
 220 }
 221
 222 /**
 223  * This function will reset a picture information (properties and quantizers).
 224  * It is sometimes useful for reusing pictures (like from a pool).
 225  */
 226 VLC_EXPORT( void, picture_Reset, ( picture_t * ) );
 227
 228 /**
 229  * This function will copy the picture pixels.
 230  * You can safely copy between pictures that do not have the same size,
 231  * only the compatible(smaller) part will be copied.
 232  */
 233 VLC_EXPORT( void, picture_CopyPixels, ( picture_t *p_dst, const picture_t *p_src ) );
 234 VLC_EXPORT( void, plane_CopyPixels, ( plane_t *p_dst, const plane_t *p_src ) );
 235
 236 /**
 237  * This function will copy both picture dynamic properties and pixels.
 238  * You have to notice that sometime a simple picture_Hold may do what
 239  * you want without the copy overhead.
 240  * Provided for convenience.
 241  *
 242  * \param p_dst pointer to the destination picture.
 243  * \param p_src pointer to the source picture.
 244  */
 245 static inline void picture_Copy( picture_t *p_dst, const picture_t *p_src )
 246 {
 247     picture_CopyPixels( p_dst, p_src );
 248     picture_CopyProperties( p_dst, p_src );
 249 }
 250
 251 /**
 252  * This function will export a picture to an encoded bitstream.
 253  *
 254  * pp_image will contain the encoded bitstream in psz_format format.
 255  *
 256  * p_fmt can be NULL otherwise it will be set with the format used for the
 257  * picture before encoding.
 258  *
 259  * i_override_width/height allow to override the width and/or the height of the
 260  * picture to be encoded:
 261  *  - if strictly lower than 0, the original dimension will be used.
 262  *  - if equal to 0, it will be deduced from the other dimension which must be
 263  *  different to 0.
 264  *  - if strictly higher than 0, it will override the dimension.
 265  * If at most one of them is > 0 then the picture aspect ratio will be kept.
 266  */
 267 VLC_EXPORT( 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 ) );
 268
 269 /**
 270  * This function will setup all fields of a picture_t without allocating any
 271  * memory.
 272  * XXX The memory must already be initialized.
 273  * It does not need to be released.
 274  *
 275  * It will return VLC_EGENERIC if the core does not understand the requested
 276  * format.
 277  *
 278  * It can be useful to get the properties of planes.
 279  */
 280 VLC_EXPORT( int, picture_Setup, ( picture_t *, vlc_fourcc_t i_chroma, int i_width, int i_height, int i_sar_num, int i_sar_den ) );
 281
 282 /*****************************************************************************
 283  * Flags used to describe the status of a picture
 284  *****************************************************************************/
 285
 286 /* Quantification type */
 287 enum
 288 {
 289     QTYPE_NONE,
 290
 291     QTYPE_MPEG1,
 292     QTYPE_MPEG2,
 293     QTYPE_H264,
 294 };
 295
 296 /*****************************************************************************
 297  * Shortcuts to access image components
 298  *****************************************************************************/
 299
 300 /* Plane indices */
 301 enum
 302 {
 303     Y_PLANE = 0,
 304     U_PLANE = 1,
 305     V_PLANE = 2,
 306     A_PLANE = 3,
 307 };
 308
 309 /* Shortcuts */
 310 #define Y_PIXELS     p[Y_PLANE].p_pixels
 311 #define Y_PITCH      p[Y_PLANE].i_pitch
 312 #define U_PIXELS     p[U_PLANE].p_pixels
 313 #define U_PITCH      p[U_PLANE].i_pitch
 314 #define V_PIXELS     p[V_PLANE].p_pixels
 315 #define V_PITCH      p[V_PLANE].i_pitch
 316 #define A_PIXELS     p[A_PLANE].p_pixels
 317 #define A_PITCH      p[A_PLANE].i_pitch
 318
 319 /**@}*/
 320
 321 #endif /* VLC_PICTURE_H */