1 /*****************************************************************************
2 * vlc_picture.h: picture definitions
3 *****************************************************************************
4 * Copyright (C) 1999 - 2009 VLC authors and VideoLAN
7 * Authors: Vincent Seguin <seguin@via.ecp.fr>
8 * Samuel Hocevar <sam@via.ecp.fr>
9 * Olivier Aubert <oaubert 47 videolan d07 org>
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.
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.
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 *****************************************************************************/
27 #define VLC_PICTURE_H 1
31 * This file defines picture structures and functions in vlc
35 #include <vlc_atomic.h>
37 /** Description of a planar graphic field */
38 typedef struct plane_t
40 uint8_t *p_pixels; /**< Start of the plane's data */
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 */
46 /** Size of a macropixel, defaults to 1 */
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 ? */
56 * Maximum number of plane for a picture
58 #define PICTURE_PLANE_MAX (VOUT_MAX_PLANES)
62 * A private definition to help overloading picture release
64 typedef struct picture_gc_sys_t picture_gc_sys_t;
72 * The properties of the picture
74 video_frame_format_t format;
76 plane_t p[PICTURE_PLANE_MAX]; /**< description of the planes */
77 int i_planes; /**< number of allocated planes */
79 /** \name Picture management properties
80 * These properties can be modified using the video output thread API,
81 * but should never be written directly */
83 mtime_t date; /**< display date */
87 /** \name Picture dynamic properties
88 * Those properties can be changed by the decoder
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 */
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;
102 /** This way the picture_Release can be overloaded */
105 atomic_uintptr_t refcount;
106 void (*pf_destroy)( picture_t * );
107 picture_gc_sys_t *p_sys;
110 /** Next picture in a FIFO a pictures */
111 struct picture_t *p_next;
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.
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;
123 * This function will create a new picture using the given format.
125 * When possible, it is preferred to use this function over picture_New
126 * as more information about the format is kept.
128 VLC_API picture_t * picture_NewFromFormat( const video_format_t *p_fmt ) VLC_USED;
131 * Resource for a picture.
135 picture_sys_t *p_sys;
136 void (*pf_destroy)(picture_t *);
139 * XXX all fields MUST be set to the right value.
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];
148 } picture_resource_t;
151 * This function will create a new picture using the provided resource.
153 * If the resource is NULL then a plain picture_NewFromFormat is returned.
155 VLC_API picture_t * picture_NewFromResource( const video_format_t *, const picture_resource_t * ) VLC_USED;
158 * This function will increase the picture reference count.
159 * It will not have any effect on picture obtained from vout
161 * It returns the given picture for convenience.
163 VLC_API picture_t *picture_Hold( picture_t *p_picture );
166 * This function will release a picture.
167 * It will not have any effect on picture obtained from vout
169 VLC_API void picture_Release( picture_t *p_picture );
172 * This function will return true if you are not the only owner of the
175 * It is only valid if it is created using picture_New.
177 VLC_API bool picture_IsReferenced( picture_t *p_picture );
180 * This function will copy all picture dynamic properties.
182 VLC_API void picture_CopyProperties( picture_t *p_dst, const picture_t *p_src );
185 * This function will reset a picture information (properties and quantizers).
186 * It is sometimes useful for reusing pictures (like from a pool).
188 VLC_API void picture_Reset( picture_t * );
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.
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 );
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.
204 * \param p_dst pointer to the destination picture.
205 * \param p_src pointer to the source picture.
207 VLC_API void picture_Copy( picture_t *p_dst, const picture_t *p_src );
210 * This function will export a picture to an encoded bitstream.
212 * pp_image will contain the encoded bitstream in psz_format format.
214 * p_fmt can be NULL otherwise it will be set with the format used for the
215 * picture before encoding.
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
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.
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 );
228 * This function will setup all fields of a picture_t without allocating any
230 * XXX The memory must already be initialized.
231 * It does not need to be released.
233 * It will return VLC_EGENERIC if the core does not understand the requested
236 * It can be useful to get the properties of planes.
238 VLC_API int picture_Setup( picture_t *, const video_format_t * );
242 * This function will blend a given subpicture onto a picture.
244 * The subpicture and all its region must:
247 * - not have the fade flag.
248 * - contains only picture (no text rendering).
249 * \return the number of region(s) succesfully blent
251 VLC_API unsigned picture_BlendSubpicture( picture_t *, filter_t *p_blend, subpicture_t * );
254 /*****************************************************************************
255 * Shortcuts to access image components
256 *****************************************************************************/
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
279 #endif /* VLC_PICTURE_H */