1 /*****************************************************************************
2 * vlc_demux.h: Demuxer descriptor, queries and methods
3 *****************************************************************************
4 * Copyright (C) 1999-2005 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 *****************************************************************************/
29 * This files defines functions and structures used by demux objects in vlc
33 #include <vlc_stream.h>
34 #include <vlc_es_out.h>
37 * \defgroup demux Demux
45 /* Module properties */
48 /* eg informative but needed (we can have access+demux) */
54 stream_t
*s
; /* NULL in case of a access+demux in one */
57 es_out_t
*out
; /* our p_es_out */
60 int (*pf_demux
) ( demux_t
* ); /* demux one frame only */
61 int (*pf_control
)( demux_t
*, int i_query
, va_list args
);
63 /* Demux has to maintain them uptodate
64 * when it is responsible of seekpoint/title */
67 unsigned int i_update
; /* Demux sets them on change,
68 Input removes them once take into account*/
69 /* Seekpoint/Title at demux level */
70 int i_title
; /* idem, start from 0 (could be menu) */
71 int i_seekpoint
; /* idem, start from 0 */
77 /* demux_meta_t is returned by "meta reader" module to the demuxer */
80 vlc_meta_t
*p_meta
; /**< meta data */
82 int i_attachments
; /**< number of attachments */
83 input_attachment_t
**attachments
; /**< array of attachments */
88 /* I. Common queries to access_demux and demux */
89 /* POSITION double between 0.0 and 1.0 */
90 DEMUX_GET_POSITION
, /* arg1= double * res= */
91 DEMUX_SET_POSITION
, /* arg1= double res=can fail */
93 /* LENGTH/TIME in microsecond, 0 if unknown */
94 DEMUX_GET_LENGTH
, /* arg1= int64_t * res= */
95 DEMUX_GET_TIME
, /* arg1= int64_t * res= */
96 DEMUX_SET_TIME
, /* arg1= int64_t res=can fail */
98 /* TITLE_INFO only if more than 1 title or 1 chapter */
99 DEMUX_GET_TITLE_INFO
, /* arg1=input_title_t*** arg2=int*
100 arg3=int*pi_title_offset(0), arg4=int*pi_seekpoint_offset(0) can fail */
101 /* TITLE/SEEKPOINT, only when TITLE_INFO succeed */
102 DEMUX_SET_TITLE
, /* arg1= int can fail */
103 DEMUX_SET_SEEKPOINT
, /* arg1= int can fail */
105 /* DEMUX_SET_GROUP only a hit for demuxer (mainly DVB) to allow not
106 * reading everything (you should not use this to call es_out_Control)
107 * if you don't know what to do with it, just IGNORE it, it is safe(r)
108 * -1 means all group, 0 default group (first es added) */
109 DEMUX_SET_GROUP
, /* arg1= int can fail */
111 /* Ask the demux to demux until the given date at the next pf_demux call
112 * but not more (and not less, at the precision available of course).
113 * XXX: not mandatory (except for subtitle demux) but I will help a lot
116 DEMUX_SET_NEXT_DEMUX_TIME
, /* arg1= int64_t * can fail */
117 /* FPS for correct subtitles handling */
118 DEMUX_GET_FPS
, /* arg1= double * res=can fail */
121 DEMUX_GET_META
, /* arg1= vlc_meta_t ** res=can fail */
122 DEMUX_HAS_UNSUPPORTED_META
, /* arg1= bool * res can fail */
125 DEMUX_GET_ATTACHMENTS
, /* arg1=input_attachment_t***, int* res=can fail */
127 /* II. Specific access_demux queries */
128 DEMUX_CAN_PAUSE
, /* arg1= bool* can fail (assume false)*/
129 DEMUX_SET_PAUSE_STATE
, /* arg1= bool can fail */
131 DEMUX_GET_PTS_DELAY
, /* arg1= int64_t* cannot fail */
133 /* DEMUX_CAN_CONTROL_PACE returns true (*pb_pace) if we can read the
134 * data at our pace */
135 DEMUX_CAN_CONTROL_PACE
, /* arg1= bool*pb_pace can fail (assume false) */
137 /* DEMUX_CAN_CONTROL_RATE is called only if DEMUX_CAN_CONTROL_PACE has returned false.
138 * *pb_rate should be true when the rate can be changed (using DEMUX_SET_RATE)
139 * *pb_ts_rescale should be true when the timestamps (pts/dts/pcr) have to be rescaled */
140 DEMUX_CAN_CONTROL_RATE
, /* arg1= bool*pb_rate arg2= bool*pb_ts_rescale can fail(assume false) */
141 /* DEMUX_SET_RATE is called only if DEMUX_CAN_CONTROL_RATE has returned true.
142 * It should return the value really used in *pi_rate */
143 DEMUX_SET_RATE
, /* arg1= int*pi_rate can fail */
145 DEMUX_CAN_SEEK
, /* arg1= bool* can fail (assume false)*/
148 VLC_EXPORT( int, demux_vaControlHelper
, ( stream_t
*, int64_t i_start
, int64_t i_end
, int i_bitrate
, int i_align
, int i_query
, va_list args
) );
150 /*************************************************************************
151 * Miscellaneous helpers for demuxers
152 *************************************************************************/
154 static inline bool demux_IsPathExtension( demux_t
*p_demux
, const char *psz_extension
)
156 const char *psz_ext
= strrchr ( p_demux
->psz_path
, '.' );
157 if( !psz_ext
|| strcasecmp( psz_ext
, psz_extension
) )
162 static inline bool demux_IsForced( demux_t
*p_demux
, const char *psz_name
)
164 if( !p_demux
->psz_demux
|| strcmp( p_demux
->psz_demux
, psz_name
) )
169 #define DEMUX_INIT_COMMON() do { \
170 p_demux->pf_control = Control; \
171 p_demux->pf_demux = Demux; \
172 MALLOC_ERR( p_demux->p_sys, demux_sys_t ); \
173 memset( p_demux->p_sys, 0, sizeof( demux_sys_t ) ); } while(0)
175 #define STANDARD_DEMUX_INIT_MSG( msg ) do { \
176 DEMUX_INIT_COMMON(); \
177 msg_Dbg( p_demux, "%s", msg ); } while(0)
179 #define DEMUX_BY_EXTENSION( ext ) \
180 demux_t *p_demux = (demux_t *)p_this; \
181 if( !demux_IsPathExtension( p_demux, ext ) ) \
182 return VLC_EGENERIC; \
185 #define DEMUX_BY_EXTENSION_MSG( ext, msg ) \
186 demux_t *p_demux = (demux_t *)p_this; \
187 if( !demux_IsPathExtension( p_demux, ext ) ) \
188 return VLC_EGENERIC; \
189 STANDARD_DEMUX_INIT_MSG( msg );
191 #define DEMUX_BY_EXTENSION_OR_FORCED( ext, module ) \
192 demux_t *p_demux = (demux_t *)p_this; \
193 if( !demux_IsPathExtension( p_demux, ext ) && !demux_IsForced( p_demux, module ) ) \
194 return VLC_EGENERIC; \
197 #define DEMUX_BY_EXTENSION_OR_FORCED_MSG( ext, module, msg ) \
198 demux_t *p_demux = (demux_t *)p_this; \
199 if( !demux_IsPathExtension( p_demux, ext ) && !demux_IsForced( p_demux, module ) ) \
200 return VLC_EGENERIC; \
201 STANDARD_DEMUX_INIT_MSG( msg );
203 #define CHECK_PEEK( zepeek, size ) \
204 if( stream_Peek( p_demux->s , &zepeek, size ) < size ){ \
205 msg_Dbg( p_demux, "not enough data" ); return VLC_EGENERIC; }
207 #define CHECK_PEEK_GOTO( zepeek, size ) \
208 if( stream_Peek( p_demux->s , &zepeek, size ) < size ) { \
209 msg_Dbg( p_demux, "not enough data" ); goto error; }
211 #define POKE( peek, stuff, size ) (strncasecmp( (const char *)peek, stuff, size )==0)
213 #define COMMON_INIT_PACKETIZER( location ) \
214 location = vlc_object_create( p_demux, VLC_OBJECT_PACKETIZER ); \
215 location->pf_decode_audio = 0; \
216 location->pf_decode_video = 0; \
217 location->pf_decode_sub = 0; \
218 location->pf_packetize = 0; \
220 #define INIT_APACKETIZER( location, a,b,c,d ) \
221 COMMON_INIT_PACKETIZER(location ); \
222 es_format_Init( &location->fmt_in, AUDIO_ES, \
223 VLC_FOURCC( a, b, c, d ) );
225 #define INIT_VPACKETIZER( location, a,b,c,d ) \
226 COMMON_INIT_PACKETIZER(location ); \
227 es_format_Init( &location->fmt_in, VIDEO_ES, \
228 VLC_FOURCC( a, b, c, d ) );
230 /* BEWARE ! This can lead to memory leaks ! */
231 #define LOAD_PACKETIZER_OR_FAIL( location, msg ) \
232 location->p_module = \
233 module_Need( location, "packetizer", NULL, 0 ); \
234 if( location->p_module == NULL ) \
236 vlc_object_release( location ); \
237 msg_Err( p_demux, "cannot find packetizer for " # msg ); \
239 return VLC_EGENERIC; \
242 #define DESTROY_PACKETIZER( location ) \
243 if( location->p_module ) module_Unneed( location, location->p_module ); \
244 vlc_object_release( location );