VLC  4.0.0-dev
vlc_access.h
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1 /*****************************************************************************
2  * vlc_access.h: Access descriptor, queries and methods
3  *****************************************************************************
4  * Copyright (C) 1999-2006 VLC authors and VideoLAN
5  *
6  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
7  *
8  * This program is free software; you can redistribute it and/or modify it
9  * under the terms of the GNU Lesser General Public License as published by
10  * the Free Software Foundation; either version 2.1 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16  * GNU Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public License
19  * along with this program; if not, write to the Free Software Foundation,
20  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
21  *****************************************************************************/
22 
23 #ifndef VLC_ACCESS_H
24 #define VLC_ACCESS_H 1
25 
26 #include <vlc_stream.h>
27 
28 /**
29  * \defgroup access Access
30  * \ingroup stream
31  * Raw input byte streams
32  * @{
33  * \file
34  * Input byte stream modules interface
35  */
36 
37 /**
38  * Special redirection error code.
39  *
40  * In case of redirection, the access open function should clean up (as in
41  * normal failure case), store the heap-allocated redirection URL in
42  * stream_t.psz_url, and return this value.
43  */
44 #define VLC_ACCESS_REDIRECT VLC_ETIMEOUT
45 
46 /**
47  * Opens a new read-only byte stream.
48  *
49  * This function might block.
50  * The initial offset is of course always zero.
51  *
52  * \param obj parent VLC object
53  * \param mrl media resource location to read
54  * \return a new access object on success, NULL on failure
55  */
56 VLC_API stream_t *vlc_access_NewMRL(vlc_object_t *obj, const char *mrl);
57 
58 /**
59  * \defgroup access_helper Access Helpers
60  * @{
61  */
62 
63 /**
64  * Default pf_control callback for directory accesses.
65  */
66 VLC_API int access_vaDirectoryControlHelper( stream_t *p_access, int i_query, va_list args );
67 
68 #define ACCESS_SET_CALLBACKS( read, block, control, seek ) \
69  do { \
70  p_access->pf_read = (read); \
71  p_access->pf_block = (block); \
72  p_access->pf_control = (control); \
73  p_access->pf_seek = (seek); \
74  } while(0)
75 
76 /**
77  * @} @}
78  */
79 
80 #endif
#define VLC_API
Definition: fourcc_gen.c:31
int access_vaDirectoryControlHelper(stream_t *p_access, int i_query, va_list args)
Default pf_control callback for directory accesses.
Definition: access.c:189
stream_t * vlc_access_NewMRL(vlc_object_t *obj, const char *mrl)
Opens a new read-only byte stream.
Definition: access.c:181
stream_t definition
Definition: vlc_stream.h:47
VLC object common members.
Definition: vlc_objects.h:45
Byte streams and byte stream filter modules interface.