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 *****************************************************************************/
25 #define VLC_STREAM_H 1
27 #include <vlc_block.h>
31 * This file defines structures and functions for stream (between access and demux) descriptor in vlc
39 * \defgroup stream Stream
41 * This will allow you to easily handle read/seek in demuxer modules.
45 /* Opaque definition for text reader context */
46 typedef struct stream_text_t stream_text_t;
56 /* Module properties for stream filter */
59 /* Real or virtual path (it can only be changed during stream_t opening) */
62 /* Stream source for stream filter */
66 int (*pf_read) ( stream_t *, void *p_read, unsigned int i_read );
67 int (*pf_peek) ( stream_t *, const uint8_t **pp_peek, unsigned int i_peek );
68 int (*pf_control)( stream_t *, int i_query, va_list );
71 void (*pf_destroy)( stream_t *);
73 /* Private data for module */
76 /* Text reader state */
77 stream_text_t *p_text;
79 /* Weak link to parent input */
80 input_thread_t *p_input;
84 * Possible commands to send to stream_Control() and stream_vaControl()
89 STREAM_CAN_SEEK, /**< arg1= bool * res=cannot fail*/
90 STREAM_CAN_FASTSEEK, /**< arg1= bool * res=cannot fail*/
93 STREAM_SET_POSITION, /**< arg1= uint64_t res=can fail */
94 STREAM_GET_POSITION, /**< arg1= uint64_t * res=cannot fail*/
96 STREAM_GET_SIZE, /**< arg1= uint64_t * res=cannot fail (0 if no sense)*/
98 /* Special for direct access control from demuxer.
99 * XXX: avoid using it by all means */
100 STREAM_CONTROL_ACCESS, /* arg1= int i_access_query, args res: can fail
101 if access unreachable or access control answer */
103 /* You should update size of source if any and then update size
104 * FIXME find a way to avoid it */
108 STREAM_GET_CONTENT_TYPE, /**< arg1= char ** res=can fail */
110 /* XXX only data read through stream_Read/Block will be recorded */
111 STREAM_SET_RECORD_STATE, /**< arg1=bool, arg2=const char *psz_ext (if arg1 is true) res=can fail */
114 VLC_EXPORT( int, stream_Read, ( stream_t *s, void *p_read, int i_read ) );
115 VLC_EXPORT( int, stream_Peek, ( stream_t *s, const uint8_t **pp_peek, int i_peek ) );
116 VLC_EXPORT( int, stream_vaControl, ( stream_t *s, int i_query, va_list args ) );
117 VLC_EXPORT( void, stream_Delete, ( stream_t *s ) );
118 VLC_EXPORT( int, stream_Control, ( stream_t *s, int i_query, ... ) );
119 VLC_EXPORT( block_t *, stream_Block, ( stream_t *s, int i_size ) );
120 VLC_EXPORT( char *, stream_ReadLine, ( stream_t * ) );
123 * Get the current position in a stream
125 static inline int64_t stream_Tell( stream_t *s )
128 stream_Control( s, STREAM_GET_POSITION, &i_pos );
130 return (int64_t)1 << 62;
135 * Get the size of the stream.
137 static inline int64_t stream_Size( stream_t *s )
140 stream_Control( s, STREAM_GET_SIZE, &i_pos );
142 return (int64_t)1 << 62;
146 static inline int stream_Seek( stream_t *s, uint64_t i_pos )
148 return stream_Control( s, STREAM_SET_POSITION, i_pos );
152 * Get the Content-Type of a stream, or NULL if unknown.
153 * Result must be free()'d.
155 static inline char *stream_ContentType( stream_t *s )
158 if( stream_Control( s, STREAM_GET_CONTENT_TYPE, &res ) )
164 * Create a special stream and a demuxer, this allows chaining demuxers
165 * You must delete it using stream_Delete.
167 VLC_EXPORT( stream_t *, stream_DemuxNew, ( demux_t *p_demux, const char *psz_demux, es_out_t *out ) );
170 * Send data to a stream_t handle created by stream_DemuxNew.
172 VLC_EXPORT( void, stream_DemuxSend, ( stream_t *s, block_t *p_block ) );
175 * Create a stream_t reading from memory.
176 * You must delete it using stream_Delete.
178 #define stream_MemoryNew( a, b, c, d ) __stream_MemoryNew( VLC_OBJECT(a), b, c, d )
179 VLC_EXPORT( stream_t *,__stream_MemoryNew, (vlc_object_t *p_obj, uint8_t *p_buffer, uint64_t i_size, bool b_preserve_memory ) );
182 * Create a stream_t reading from an URL.
183 * You must delete it using stream_Delete.
185 #define stream_UrlNew( a, b ) __stream_UrlNew( VLC_OBJECT(a), b )
186 VLC_EXPORT( stream_t *,__stream_UrlNew, (vlc_object_t *p_this, const char *psz_url ) );
189 * Try to add a stream filter to an open stream.
190 * @return New stream to use, or NULL if the filter could not be added.
192 VLC_EXPORT( stream_t*, stream_FilterNew, ( stream_t *p_source, const char *psz_stream_filter ) );