include/vlc_vout.h

   1 /*****************************************************************************
   2  * vlc_vout.h: common video definitions
   3  *****************************************************************************
   4  * Copyright (C) 1999 - 2008 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_VOUT_H_
  27 #define VLC_VOUT_H_ 1
  28
  29 #include <vlc_es.h>
  30 #include <vlc_picture.h>
  31 #include <vlc_subpicture.h>
  32
  33 /**
  34  * \defgroup output Output
  35  * \defgroup video_output Video output
  36  * \ingroup output
  37  * Video rendering, output and window management
  38  *
  39  * This module describes the programming interface for video output threads.
  40  * It includes functions allowing to open a new thread, send pictures to a
  41  * thread, and destroy a previously opened video output thread.
  42  * @{
  43  * \file
  44  * Video output thread interface
  45  */
  46
  47 /**
  48  * Vout configuration
  49  */
  50 typedef struct {
  51     vout_thread_t        *vout;
  52     vlc_object_t         *input;
  53     bool                 change_fmt;
  54     const video_format_t *fmt;
  55     unsigned             dpb_size;
  56 } vout_configuration_t;
  57
  58 /**
  59  * Video output thread private structure
  60  */
  61 typedef struct vout_thread_sys_t vout_thread_sys_t;
  62
  63 /**
  64  * Video output thread descriptor
  65  *
  66  * Any independent video output device, such as an X11 window or a GGI device,
  67  * is represented by a video output thread, and described using the following
  68  * structure.
  69  */
  70 struct vout_thread_t {
  71     VLC_COMMON_MEMBERS
  72
  73     /* Private vout_thread data */
  74     vout_thread_sys_t *p;
  75 };
  76
  77 /* Alignment flags */
  78 #define VOUT_ALIGN_LEFT         0x0001
  79 #define VOUT_ALIGN_RIGHT        0x0002
  80 #define VOUT_ALIGN_HMASK        0x0003
  81 #define VOUT_ALIGN_TOP          0x0004
  82 #define VOUT_ALIGN_BOTTOM       0x0008
  83 #define VOUT_ALIGN_VMASK        0x000C
  84
  85 /**
  86  * Viewpoints
  87  */
  88 struct vlc_viewpoint_t {
  89     float yaw;   /* yaw in degrees */
  90     float pitch; /* pitch in degrees */
  91     float roll;  /* roll in degrees */
  92     float fov;   /* field of view in degrees */
  93 };
  94
  95 static inline void vlc_viewpoint_init( vlc_viewpoint_t *p_vp )
  96 {
  97     p_vp->yaw = p_vp->pitch = p_vp->roll = 0.0f;
  98     p_vp->fov = FIELD_OF_VIEW_DEGREES_DEFAULT;
  99 }
 100
 101 /*****************************************************************************
 102  * Prototypes
 103  *****************************************************************************/
 104
 105 /**
 106  * Returns a suitable vout or release the given one.
 107  *
 108  * If cfg->fmt is non NULL and valid, a vout will be returned, reusing cfg->vout
 109  * is possible, otherwise it returns NULL.
 110  * If cfg->vout is not used, it will be closed and released.
 111  *
 112  * You can release the returned value either by vout_Request or vout_Close()
 113  * followed by a vlc_object_release() or shorter vout_CloseAndRelease()
 114  *
 115  * \param object a vlc object
 116  * \param cfg the video configuration requested.
 117  * \return a vout
 118  */
 119 VLC_API vout_thread_t * vout_Request( vlc_object_t *object, const vout_configuration_t *cfg );
 120 #define vout_Request(a,b) vout_Request(VLC_OBJECT(a),b)
 121
 122 /**
 123  * This function will close a vout created by vout_Request.
 124  * The associated vout module is closed.
 125  * Note: It is not released yet, you'll have to call vlc_object_release()
 126  * or use the convenient vout_CloseAndRelease().
 127  *
 128  * \param p_vout the vout to close
 129  */
 130 VLC_API void vout_Close( vout_thread_t *p_vout );
 131
 132 /**
 133  * This function will close a vout created by vout_Create
 134  * and then release it.
 135  *
 136  * \param p_vout the vout to close and release
 137  */
 138 static inline void vout_CloseAndRelease( vout_thread_t *p_vout )
 139 {
 140     vout_Close( p_vout );
 141     vlc_object_release( p_vout );
 142 }
 143
 144 /**
 145  * This function will handle a snapshot request.
 146  *
 147  * pp_image, pp_picture and p_fmt can be NULL otherwise they will be
 148  * set with returned value in case of success.
 149  *
 150  * pp_image will hold an encoded picture in psz_format format.
 151  *
 152  * i_timeout specifies the time the function will wait for a snapshot to be
 153  * available.
 154  *
 155  */
 156 VLC_API int vout_GetSnapshot( vout_thread_t *p_vout,
 157                               block_t **pp_image, picture_t **pp_picture,
 158                               video_format_t *p_fmt,
 159                               const char *psz_format, mtime_t i_timeout );
 160
 161 VLC_API void vout_ChangeAspectRatio( vout_thread_t *p_vout,
 162                                      unsigned int i_num, unsigned int i_den );
 163
 164 /* */
 165 VLC_API picture_t * vout_GetPicture( vout_thread_t * );
 166 VLC_API void vout_PutPicture( vout_thread_t *, picture_t * );
 167
 168 /* Subpictures channels ID */
 169 #define VOUT_SPU_CHANNEL_OSD            1 /* OSD channel is automatically cleared */
 170 #define VOUT_SPU_CHANNEL_AVAIL_FIRST    8 /* Registerable channels from this offset */
 171
 172 /* */
 173 VLC_API void vout_PutSubpicture( vout_thread_t *, subpicture_t * );
 174 VLC_API int vout_RegisterSubpictureChannel( vout_thread_t * );
 175 VLC_API void vout_FlushSubpictureChannel( vout_thread_t *, int );
 176
 177 /**@}*/
 178
 179 #endif /* _VLC_VIDEO_H */