vlc_stream.h 7.85 KB
Newer Older
1
/*****************************************************************************
2
 * vlc_stream.h: Stream (between access and demux) descriptor and methods
3
 *****************************************************************************
Jean-Baptiste Kempf's avatar
LGPL  
Jean-Baptiste Kempf committed
4
 * Copyright (C) 1999-2004 VLC authors and VideoLAN
5
 * $Id$
6 7 8
 *
 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
 *
Jean-Baptiste Kempf's avatar
LGPL  
Jean-Baptiste Kempf committed
9 10 11
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
12 13 14 15
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
Jean-Baptiste Kempf's avatar
LGPL  
Jean-Baptiste Kempf committed
16 17
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
18
 *
Jean-Baptiste Kempf's avatar
LGPL  
Jean-Baptiste Kempf committed
19 20 21
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 23
 *****************************************************************************/

24 25
#ifndef VLC_STREAM_H
#define VLC_STREAM_H 1
26

Clément Stenac's avatar
Clément Stenac committed
27 28
#include <vlc_block.h>

29 30 31 32
# ifdef __cplusplus
extern "C" {
# endif

33 34
/**
 * \defgroup stream Stream
35 36 37 38
 * \ingroup input
 * Buffered input byte streams
 * \file
 * Byte streams and byte stream filter modules interface
39 40
 */

Laurent Aimar's avatar
Laurent Aimar committed
41 42 43 44 45 46 47 48 49 50
/* Opaque definition for text reader context */
typedef struct stream_text_t stream_text_t;

/**
 * stream_t definition
 */

struct stream_t
{
    VLC_COMMON_MEMBERS
51
    bool        b_error;
Laurent Aimar's avatar
Laurent Aimar committed
52

53
    /* Module properties for stream filter */
Laurent Aimar's avatar
Laurent Aimar committed
54 55
    module_t    *p_module;

56
    char        *psz_access;
57 58 59
    /* Real or virtual path (it can only be changed during stream_t opening) */
    char        *psz_path;

60 61
    /* Stream source for stream filter */
    stream_t *p_source;
Laurent Aimar's avatar
Laurent Aimar committed
62 63

    /* */
64 65
    int         (*pf_read)   ( stream_t *, void *p_read, unsigned int i_read );
    int         (*pf_peek)   ( stream_t *, const uint8_t **pp_peek, unsigned int i_peek );
Thomas Guillem's avatar
Thomas Guillem committed
66
    input_item_t *(*pf_readdir)( stream_t * );
67
    int         (*pf_control)( stream_t *, int i_query, va_list );
68 69

    /* */
Laurent Aimar's avatar
Laurent Aimar committed
70 71 72 73 74 75 76
    void     (*pf_destroy)( stream_t *);

    /* Private data for module */
    stream_sys_t *p_sys;

    /* Text reader state */
    stream_text_t *p_text;
77 78 79

    /* Weak link to parent input */
    input_thread_t *p_input;
Laurent Aimar's avatar
Laurent Aimar committed
80 81
};

82 83 84 85 86 87
/**
 * Possible commands to send to stream_Control() and stream_vaControl()
 */
enum stream_query_e
{
    /* capabilities */
88 89
    STREAM_CAN_SEEK,            /**< arg1= bool *   res=cannot fail*/
    STREAM_CAN_FASTSEEK,        /**< arg1= bool *   res=cannot fail*/
90 91
    STREAM_CAN_PAUSE,           /**< arg1= bool *   res=cannot fail*/
    STREAM_CAN_CONTROL_PACE,    /**< arg1= bool *   res=cannot fail*/
92
    STREAM_IS_DIRECTORY,        /**< arg1= bool *, arg2= bool *, arg3=bool *, res=cannot fail*/
93 94

    /* */
95 96
    STREAM_SET_POSITION,        /**< arg1= uint64_t       res=can fail  */
    STREAM_GET_POSITION,        /**< arg1= uint64_t *     res=cannot fail*/
97

98
    STREAM_GET_SIZE,            /**< arg1= uint64_t *     res=cannot fail (0 if no sense)*/
99

100
    /* You should update size of source if any and then update size
101 102 103 104
     * FIXME find a way to avoid it */
    STREAM_UPDATE_SIZE,

    /* */
105 106
    STREAM_GET_PTS_DELAY = 0x101,/**< arg1= int64_t* res=cannot fail */
    STREAM_GET_TITLE_INFO, /**< arg1=input_title_t*** arg2=int* res=can fail */
107 108
    STREAM_GET_TITLE,       /**< arg1=unsigned * res=can fail */
    STREAM_GET_SEEKPOINT,   /**< arg1=unsigned * res=can fail */
109
    STREAM_GET_META,        /**< arg1= vlc_meta_t **       res=can fail */
110
    STREAM_GET_CONTENT_TYPE,    /**< arg1= char **         res=can fail */
111
    STREAM_GET_SIGNAL,      /**< arg1=double *pf_quality, arg2=double *pf_strength   res=can fail */
112

113
    STREAM_SET_PAUSE_STATE = 0x200, /**< arg1= bool        res=can fail */
114 115
    STREAM_SET_TITLE,       /**< arg1= int          res=can fail */
    STREAM_SET_SEEKPOINT,   /**< arg1= int          res=can fail */
116

117
    /* XXX only data read through stream_Read/Block will be recorded */
118
    STREAM_SET_RECORD_STATE,     /**< arg1=bool, arg2=const char *psz_ext (if arg1 is true)  res=can fail */
119 120 121 122

    STREAM_SET_PRIVATE_ID_STATE = 0x1000, /* arg1= int i_private_data, bool b_selected    res=can fail */
    STREAM_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 */
    STREAM_GET_PRIVATE_ID_STATE,          /* arg1=int i_private_data arg2=bool *          res=can fail */
123 124
};

125 126 127 128 129 130
VLC_API int stream_Read( stream_t *s, void *p_read, int i_read );
VLC_API int stream_Peek( stream_t *s, const uint8_t **pp_peek, int i_peek );
VLC_API int stream_vaControl( stream_t *s, int i_query, va_list args );
VLC_API void stream_Delete( stream_t *s );
VLC_API int stream_Control( stream_t *s, int i_query, ... );
VLC_API block_t * stream_Block( stream_t *s, int i_size );
131
VLC_API block_t * stream_BlockRemaining( stream_t *s, int i_max_size );
132
VLC_API char * stream_ReadLine( stream_t * );
Thomas Guillem's avatar
Thomas Guillem committed
133
VLC_API input_item_t *stream_ReadDir( stream_t * );
134 135 136 137

/**
 * Get the current position in a stream
 */
138 139
static inline int64_t stream_Tell( stream_t *s )
{
140
    uint64_t i_pos;
141
    stream_Control( s, STREAM_GET_POSITION, &i_pos );
142 143
    if( i_pos >> 62 )
        return (int64_t)1 << 62;
144 145
    return i_pos;
}
146 147 148 149

/**
 * Get the size of the stream.
 */
150 151
static inline int64_t stream_Size( stream_t *s )
{
152
    uint64_t i_pos;
153
    stream_Control( s, STREAM_GET_SIZE, &i_pos );
154 155
    if( i_pos >> 62 )
        return (int64_t)1 << 62;
156 157
    return i_pos;
}
158

159
static inline int stream_Seek( stream_t *s, uint64_t i_pos )
160 161 162 163
{
    return stream_Control( s, STREAM_SET_POSITION, i_pos );
}

164 165 166 167 168 169 170 171 172 173 174 175
/**
 * Get the Content-Type of a stream, or NULL if unknown.
 * Result must be free()'d.
 */
static inline char *stream_ContentType( stream_t *s )
{
    char *res;
    if( stream_Control( s, STREAM_GET_CONTENT_TYPE, &res ) )
        return NULL;
    return res;
}

176 177
/**
 * Create a special stream and a demuxer, this allows chaining demuxers
178
 * You must delete it using stream_Delete.
179
 */
180
VLC_API stream_t * stream_DemuxNew( demux_t *p_demux, const char *psz_demux, es_out_t *out );
Antoine Cellerier's avatar
Antoine Cellerier committed
181

182
/**
183
 * Send data to a stream handle created by stream_DemuxNew().
184
 */
185
VLC_API void stream_DemuxSend( stream_t *s, block_t *p_block );
186

187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203
/**
 * Perform a <b>demux</b> (i.e. DEMUX_...) control request on a stream handle
 * created by stream_DemuxNew().
 */
VLC_API int stream_DemuxControlVa( stream_t *s, int, va_list );

static inline int stream_DemuxControl( stream_t *s, int query, ... )
{
    va_list ap;
    int ret;

    va_start( ap, query );
    ret = stream_DemuxControlVa( s, query, ap );
    va_end( ap );
    return ret;
}

204 205 206 207
/**
 * Create a stream_t reading from memory.
 * You must delete it using stream_Delete.
 */
208
VLC_API stream_t * stream_MemoryNew(vlc_object_t *p_obj, uint8_t *p_buffer, uint64_t i_size, bool b_preserve_memory );
209
#define stream_MemoryNew( a, b, c, d ) stream_MemoryNew( VLC_OBJECT(a), b, c, d )
210 211

/**
Pierre Ynard's avatar
Pierre Ynard committed
212
 * Create a stream_t reading from a URL.
213 214
 * You must delete it using stream_Delete.
 */
215
VLC_API stream_t * stream_UrlNew(vlc_object_t *p_this, const char *psz_url );
216 217
#define stream_UrlNew( a, b ) stream_UrlNew( VLC_OBJECT(a), b )

218

219 220 221 222
/**
 * Try to add a stream filter to an open stream.
 * @return New stream to use, or NULL if the filter could not be added.
 **/
223
VLC_API stream_t* stream_FilterNew( stream_t *p_source, const char *psz_stream_filter );
224 225 226 227 228

/**
 * Default ReadDir implementation for stream Filter. This implementation just
 * forward the pf_readdir call to the p_source stream.
 */
Thomas Guillem's avatar
Thomas Guillem committed
229
VLC_API input_item_t *stream_FilterDefaultReadDir( stream_t *s );
230 231 232 233 234 235 236

/**
 * Sets stream_FilterDefaultReadDir as the pf_readdir callback for this stream filter
 */
#define stream_FilterSetDefaultReadDir(p_stream) \
    p_stream->pf_readdir = stream_FilterDefaultReadDir;

237 238 239 240
/**
 * @}
 */

241 242 243 244
# ifdef __cplusplus
}
# endif

245
#endif