include/vlc_access.h

   1 /*****************************************************************************
   2  * vlc_access.h: Access descriptor, queries and methods
   3  *****************************************************************************
   4  * Copyright (C) 1999-2006 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 #ifndef VLC_ACCESS_H
  25 #define VLC_ACCESS_H 1
  26
  27 #include <vlc_stream.h>
  28
  29 /**
  30  * \defgroup access Access
  31  * \ingroup stream
  32  * Raw input byte streams
  33  * @{
  34  * \file
  35  * Input byte stream modules interface
  36  */
  37
  38 /**
  39  * Special redirection error code.
  40  *
  41  * In case of redirection, the access open function should clean up (as in
  42  * normal failure case), store the heap-allocated redirection URL in
  43  * stream_t.psz_url, and return this value.
  44  */
  45 #define VLC_ACCESS_REDIRECT VLC_ETIMEOUT
  46
  47 /**
  48  * Opens a new read-only byte stream.
  49  *
  50  * This function might block.
  51  * The initial offset is of course always zero.
  52  *
  53  * \param obj parent VLC object
  54  * \param mrl media resource location to read
  55  * \return a new access object on success, NULL on failure
  56  */
  57 VLC_API stream_t *vlc_access_NewMRL(vlc_object_t *obj, const char *mrl);
  58
  59 /**
  60  * \defgroup access_helper Access Helpers
  61  * @{
  62  */
  63
  64 /**
  65  * Default pf_control callback for directory accesses.
  66  */
  67 VLC_API int access_vaDirectoryControlHelper( stream_t *p_access, int i_query, va_list args );
  68
  69 #define ACCESS_SET_CALLBACKS( read, block, control, seek ) \
  70     do { \
  71         p_access->pf_read = (read); \
  72         p_access->pf_block = (block); \
  73         p_access->pf_control = (control); \
  74         p_access->pf_seek = (seek); \
  75     } while(0)
  76
  77 /**
  78  * @} @}
  79  */
  80
  81 #endif