1 /*****************************************************************************
2 * vlc_access.h: Access descriptor, queries and methods
3 *****************************************************************************
4 * Copyright (C) 1999-2006 the VideoLAN team
7 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
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 General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 #if !defined( __LIBVLC__ )
25 #error You are not libvlc or one of its plugins. You cannot include this file
29 #define _VLC_ACCESS_H 1
31 #include <vlc_block.h>
34 * \defgroup access Access
41 ACCESS_CAN_SEEK, /* arg1= vlc_bool_t* cannot fail */
42 ACCESS_CAN_FASTSEEK, /* arg1= vlc_bool_t* cannot fail */
43 ACCESS_CAN_PAUSE, /* arg1= vlc_bool_t* cannot fail */
44 ACCESS_CAN_CONTROL_PACE,/* arg1= vlc_bool_t* cannot fail */
47 ACCESS_GET_MTU, /* arg1= int* cannot fail(0 if no sense)*/
48 ACCESS_GET_PTS_DELAY, /* arg1= int64_t* cannot fail */
50 ACCESS_GET_TITLE_INFO, /* arg1=input_title_t*** arg2=int* can fail */
52 ACCESS_GET_META, /* arg1= vlc_meta_t ** res=can fail */
55 ACCESS_SET_PAUSE_STATE, /* arg1= vlc_bool_t can fail */
58 ACCESS_SET_TITLE, /* arg1= int can fail */
59 ACCESS_SET_SEEKPOINT, /* arg1= int can fail */
61 /* Special mode for access/demux communication
62 * XXX: avoid to use it unless you can't */
63 ACCESS_SET_PRIVATE_ID_STATE, /* arg1= int i_private_data, vlc_bool_t b_selected can fail */
64 ACCESS_SET_PRIVATE_ID_CA, /* arg1= int i_program_number, uint16_t i_vpid, uint16_t i_apid1, uint16_t i_apid2, uint16_t i_apid3, uint8_t i_length, uint8_t *p_data */
65 ACCESS_GET_PRIVATE_ID_STATE, /* arg1=int i_private_data arg2=vlc_bool_t * res=can fail */
67 ACCESS_GET_CONTENT_TYPE, /* arg1=char **ppsz_content_type */
74 /* Module properties */
77 /* Access name (empty if non forced) */
79 /* Access path/url/filename/.... */
81 /* Access source for access_filter (NULL for regular access) */
84 /* Access can fill this entry to force a demuxer
85 * XXX: fill it once you know for sure you will succeed
86 * (if you fail, this value won't be reseted */
89 /* pf_read/pf_block is used to read data.
90 * XXX A access should set one and only one of them */
91 ssize_t (*pf_read) ( access_t *, uint8_t *, size_t ); /* Return -1 if no data yet, 0 if no more data, else real data read */
92 block_t *(*pf_block)( access_t * ); /* return a block of data in his 'natural' size, NULL if not yet data or eof */
94 /* Called for each seek.
96 int (*pf_seek) ( access_t *, int64_t ); /* can be null if can't seek */
98 /* Used to retreive and configure the access
99 * XXX mandatory. look at access_query_e to know what query you *have to* support */
100 int (*pf_control)( access_t *, int i_query, va_list args);
102 /* Access has to maintain them uptodate */
105 unsigned int i_update; /* Access sets them on change,
106 Input removes them once take into account*/
108 int64_t i_size; /* Write only for access, read only for input */
109 int64_t i_pos; /* idem */
110 vlc_bool_t b_eof; /* idem */
112 int i_title; /* idem, start from 0 (could be menu) */
113 int i_seekpoint;/* idem, start from 0 */
115 vlc_bool_t b_prebuffered; /* Read only for input */
120 static inline int access2_vaControl( access_t *p_access, int i_query, va_list args )
122 if( !p_access ) return VLC_EGENERIC;
123 return p_access->pf_control( p_access, i_query, args );
126 static inline int access2_Control( access_t *p_access, int i_query, ... )
131 va_start( args, i_query );
132 i_result = access2_vaControl( p_access, i_query, args );
137 static inline char *access_GetContentType( access_t *p_access )
140 if( access2_Control( p_access, ACCESS_GET_CONTENT_TYPE, &res ) )
145 static inline void access_InitFields( access_t *p_a )
147 p_a->info.i_update = 0;
148 p_a->info.i_size = 0;
150 p_a->info.b_eof = VLC_FALSE;
151 p_a->info.i_title = 0;
152 p_a->info.i_seekpoint = 0;
155 #define ACCESS_SET_CALLBACKS( read, block, control, seek ) \
156 p_access->pf_read = read; \
157 p_access->pf_block = block; \
158 p_access->pf_control = control; \
159 p_access->pf_seek = seek; \
161 #define STANDARD_READ_ACCESS_INIT \
162 access_InitFields( p_access ); \
163 ACCESS_SET_CALLBACKS( Read, NULL, Control, Seek ); \
164 MALLOC_ERR( p_access->p_sys, access_sys_t ); \
165 p_sys = p_access->p_sys; memset( p_sys, 0, sizeof( access_sys_t ) );
167 #define STANDARD_BLOCK_ACCESS_INIT \
168 access_InitFields( p_access ); \
169 ACCESS_SET_CALLBACKS( NULL, Block, Control, Seek ); \
170 MALLOC_ERR( p_access->p_sys, access_sys_t ); \
171 p_sys = p_access->p_sys; memset( p_sys, 0, sizeof( access_sys_t ) );