1 /*****************************************************************************
2 * vlc_stream.h: Stream (between access and demux) descriptor and methods
3 *****************************************************************************
4 * Copyright (C) 1999-2004 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_STREAM_H 1
31 #include <vlc_block.h>
38 * \defgroup stream Stream
40 * This will allow you to easily handle read/seek in demuxer modules.
45 * Possible commands to send to stream_Control() and stream_vaControl()
50 STREAM_CAN_SEEK, /**< arg1= vlc_bool_t * res=cannot fail*/
51 STREAM_CAN_FASTSEEK, /**< arg1= vlc_bool_t * res=cannot fail*/
54 STREAM_SET_POSITION, /**< arg1= int64_t res=can fail */
55 STREAM_GET_POSITION, /**< arg1= int64_t * res=cannot fail*/
57 STREAM_GET_SIZE, /**< arg1= int64_t * res=cannot fail (0 if no sense)*/
59 STREAM_GET_MTU, /**< arg1= int * res=cannot fail (0 if no sense)*/
61 /* Special for direct access control from demuxer.
62 * XXX: avoid using it by all means */
63 STREAM_CONTROL_ACCESS /* arg1= int i_access_query, args res: can fail
64 if access unreachable or access control answer */
67 VLC_EXPORT( int, stream_Read, ( stream_t *s, void *p_read, int i_read ) );
68 VLC_EXPORT( int, stream_Peek, ( stream_t *s, const uint8_t **pp_peek, int i_peek ) );
69 VLC_EXPORT( int, stream_vaControl, ( stream_t *s, int i_query, va_list args ) );
70 VLC_EXPORT( void, stream_Delete, ( stream_t *s ) );
71 VLC_EXPORT( int, stream_Control, ( stream_t *s, int i_query, ... ) );
72 VLC_EXPORT( block_t *, stream_Block, ( stream_t *s, int i_size ) );
73 VLC_EXPORT( char *, stream_ReadLine, ( stream_t * ) );
76 * Get the current position in a stream
78 static inline int64_t stream_Tell( stream_t *s )
81 stream_Control( s, STREAM_GET_POSITION, &i_pos );
86 * Get the size of the stream.
88 static inline int64_t stream_Size( stream_t *s )
91 stream_Control( s, STREAM_GET_SIZE, &i_pos );
94 static inline int stream_MTU( stream_t *s )
97 stream_Control( s, STREAM_GET_MTU, &i_mtu );
100 static inline int stream_Seek( stream_t *s, int64_t i_pos )
102 return stream_Control( s, STREAM_SET_POSITION, i_pos );
106 * Create a special stream and a demuxer, this allows chaining demuxers
108 #define stream_DemuxNew( a, b, c ) __stream_DemuxNew( VLC_OBJECT(a), b, c)
109 VLC_EXPORT( stream_t *,__stream_DemuxNew, ( vlc_object_t *p_obj, const char *psz_demux, es_out_t *out ) );
110 VLC_EXPORT( void, stream_DemuxSend, ( stream_t *s, block_t *p_block ) );
111 VLC_EXPORT( void, stream_DemuxDelete,( stream_t *s ) );
114 #define stream_MemoryNew( a, b, c, d ) __stream_MemoryNew( VLC_OBJECT(a), b, c, d )
115 VLC_EXPORT( stream_t *,__stream_MemoryNew, (vlc_object_t *p_obj, uint8_t *p_buffer, int64_t i_size, vlc_bool_t i_preserve_memory ) );
116 #define stream_UrlNew( a, b ) __stream_UrlNew( VLC_OBJECT(a), b )
117 VLC_EXPORT( stream_t *,__stream_UrlNew, (vlc_object_t *p_this, const char *psz_url ) );
127 # if defined (__PLUGIN__) || defined (__BUILTIN__)
128 /* FIXME UGLY HACK to keep VLC_OBJECT working */
129 /* Maybe we should make VLC_OBJECT a simple cast noawadays... */