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- /*****************************************************************************
- * vlc_demux.h: Demuxer descriptor, queries and methods
- *****************************************************************************
- * Copyright (C) 1999-2005 the VideoLAN team
- * $Id: 5b5c5829c2d2ca261961a0315d6e58994157e41f $
- *
- * Authors: Laurent Aimar <fenrir@via.ecp.fr>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (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
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU 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.
- *****************************************************************************/
-
- #ifndef VLC_DEMUX_H
- #define VLC_DEMUX_H 1
-
- /**
- * \file
- * This files defines functions and structures used by demux objects in vlc
- */
-
- #include <vlc_es.h>
- #include <vlc_stream.h>
- #include <vlc_es_out.h>
-
- /**
- * \defgroup demux Demux
- * @{
- */
-
- struct demux_t
- {
- VLC_COMMON_MEMBERS
-
- /* Module properties */
- module_t *p_module;
-
- /* eg informative but needed (we can have access+demux) */
- char *psz_access;
- char *psz_demux;
- char *psz_path;
-
- /* input stream */
- stream_t *s; /* NULL in case of a access+demux in one */
-
- /* es output */
- es_out_t *out; /* our p_es_out */
-
- /* set by demuxer */
- int (*pf_demux) ( demux_t * ); /* demux one frame only */
- int (*pf_control)( demux_t *, int i_query, va_list args);
-
- /* Demux has to maintain them uptodate
- * when it is responsible of seekpoint/title */
- struct
- {
- unsigned int i_update; /* Demux sets them on change,
- Input removes them once take into account*/
- /* Seekpoint/Title at demux level */
- int i_title; /* idem, start from 0 (could be menu) */
- int i_seekpoint; /* idem, start from 0 */
- } info;
- demux_sys_t *p_sys;
- };
-
-
- /* demux_meta_t is returned by "meta reader" module to the demuxer */
- struct demux_meta_t
- {
- vlc_meta_t *p_meta; /**< meta data */
-
- int i_attachments; /**< number of attachments */
- input_attachment_t **attachments; /**< array of attachments */
- };
-
- enum demux_query_e
- {
- /* I. Common queries to access_demux and demux */
- /* POSITION double between 0.0 and 1.0 */
- DEMUX_GET_POSITION, /* arg1= double * res= */
- DEMUX_SET_POSITION, /* arg1= double res=can fail */
-
- /* LENGTH/TIME in microsecond, 0 if unknown */
- DEMUX_GET_LENGTH, /* arg1= int64_t * res= */
- DEMUX_GET_TIME, /* arg1= int64_t * res= */
- DEMUX_SET_TIME, /* arg1= int64_t res=can fail */
-
- /* TITLE_INFO only if more than 1 title or 1 chapter */
- DEMUX_GET_TITLE_INFO, /* arg1=input_title_t*** arg2=int*
- arg3=int*pi_title_offset(0), arg4=int*pi_seekpoint_offset(0) can fail */
- /* TITLE/SEEKPOINT, only when TITLE_INFO succeed */
- DEMUX_SET_TITLE, /* arg1= int can fail */
- DEMUX_SET_SEEKPOINT, /* arg1= int can fail */
-
- /* DEMUX_SET_GROUP only a hit for demuxer (mainly DVB) to allow not
- * reading everything (you should not use this to call es_out_Control)
- * if you don't know what to do with it, just IGNORE it, it is safe(r)
- * -1 means all group, 0 default group (first es added) */
- DEMUX_SET_GROUP, /* arg1= int can fail */
-
- /* Ask the demux to demux until the given date at the next pf_demux call
- * but not more (and not less, at the precision available of course).
- * XXX: not mandatory (except for subtitle demux) but I will help a lot
- * for multi-input
- */
- DEMUX_SET_NEXT_DEMUX_TIME, /* arg1= int64_t * can fail */
- /* FPS for correct subtitles handling */
- DEMUX_GET_FPS, /* arg1= double * res=can fail */
-
- /* Meta data */
- DEMUX_GET_META, /* arg1= vlc_meta_t ** res=can fail */
- DEMUX_HAS_UNSUPPORTED_META, /* arg1= bool * res can fail */
-
- /* Attachments */
- DEMUX_GET_ATTACHMENTS, /* arg1=input_attachment_t***, int* res=can fail */
-
- /* II. Specific access_demux queries */
- DEMUX_CAN_PAUSE, /* arg1= bool* can fail (assume false)*/
- DEMUX_SET_PAUSE_STATE, /* arg1= bool can fail */
-
- DEMUX_GET_PTS_DELAY, /* arg1= int64_t* cannot fail */
-
- /* DEMUX_CAN_CONTROL_PACE returns true (*pb_pace) if we can read the
- * data at our pace */
- DEMUX_CAN_CONTROL_PACE, /* arg1= bool*pb_pace can fail (assume false) */
-
- /* DEMUX_CAN_CONTROL_RATE is called only if DEMUX_CAN_CONTROL_PACE has returned false.
- * *pb_rate should be true when the rate can be changed (using DEMUX_SET_RATE)
- * *pb_ts_rescale should be true when the timestamps (pts/dts/pcr) have to be rescaled */
- DEMUX_CAN_CONTROL_RATE, /* arg1= bool*pb_rate arg2= bool*pb_ts_rescale can fail(assume false) */
- /* DEMUX_SET_RATE is called only if DEMUX_CAN_CONTROL_RATE has returned true.
- * It should return the value really used in *pi_rate */
- DEMUX_SET_RATE, /* arg1= int*pi_rate can fail */
-
- DEMUX_CAN_SEEK, /* arg1= bool* can fail (assume false)*/
- };
-
- 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 ) );
-
- /*************************************************************************
- * Miscellaneous helpers for demuxers
- *************************************************************************/
-
- static inline bool demux_IsPathExtension( demux_t *p_demux, const char *psz_extension )
- {
- const char *psz_ext = strrchr ( p_demux->psz_path, '.' );
- if( !psz_ext || strcasecmp( psz_ext, psz_extension ) )
- return false;
- return true;
- }
-
- static inline bool demux_IsForced( demux_t *p_demux, const char *psz_name )
- {
- if( !p_demux->psz_demux || strcmp( p_demux->psz_demux, psz_name ) )
- return false;
- return true;
- }
-
- #define DEMUX_INIT_COMMON() do { \
- p_demux->pf_control = Control; \
- p_demux->pf_demux = Demux; \
- MALLOC_ERR( p_demux->p_sys, demux_sys_t ); \
- memset( p_demux->p_sys, 0, sizeof( demux_sys_t ) ); } while(0)
-
- #define STANDARD_DEMUX_INIT_MSG( msg ) do { \
- DEMUX_INIT_COMMON(); \
- msg_Dbg( p_demux, "%s", msg ); } while(0)
-
- #define DEMUX_BY_EXTENSION( ext ) \
- demux_t *p_demux = (demux_t *)p_this; \
- if( !demux_IsPathExtension( p_demux, ext ) ) \
- return VLC_EGENERIC; \
- DEMUX_INIT_COMMON();
-
- #define DEMUX_BY_EXTENSION_MSG( ext, msg ) \
- demux_t *p_demux = (demux_t *)p_this; \
- if( !demux_IsPathExtension( p_demux, ext ) ) \
- return VLC_EGENERIC; \
- STANDARD_DEMUX_INIT_MSG( msg );
-
- #define DEMUX_BY_EXTENSION_OR_FORCED( ext, module ) \
- demux_t *p_demux = (demux_t *)p_this; \
- if( !demux_IsPathExtension( p_demux, ext ) && !demux_IsForced( p_demux, module ) ) \
- return VLC_EGENERIC; \
- DEMUX_INIT_COMMON();
-
- #define DEMUX_BY_EXTENSION_OR_FORCED_MSG( ext, module, msg ) \
- demux_t *p_demux = (demux_t *)p_this; \
- if( !demux_IsPathExtension( p_demux, ext ) && !demux_IsForced( p_demux, module ) ) \
- return VLC_EGENERIC; \
- STANDARD_DEMUX_INIT_MSG( msg );
-
- #define CHECK_PEEK( zepeek, size ) \
- if( stream_Peek( p_demux->s , &zepeek, size ) < size ){ \
- msg_Dbg( p_demux, "not enough data" ); return VLC_EGENERIC; }
-
- #define CHECK_PEEK_GOTO( zepeek, size ) \
- if( stream_Peek( p_demux->s , &zepeek, size ) < size ) { \
- msg_Dbg( p_demux, "not enough data" ); goto error; }
-
- #define POKE( peek, stuff, size ) (strncasecmp( (const char *)peek, stuff, size )==0)
-
- #define COMMON_INIT_PACKETIZER( location ) \
- location = vlc_object_create( p_demux, VLC_OBJECT_PACKETIZER ); \
- location->pf_decode_audio = 0; \
- location->pf_decode_video = 0; \
- location->pf_decode_sub = 0; \
- location->pf_packetize = 0; \
-
- #define INIT_APACKETIZER( location, a,b,c,d ) \
- COMMON_INIT_PACKETIZER(location ); \
- es_format_Init( &location->fmt_in, AUDIO_ES, \
- VLC_FOURCC( a, b, c, d ) );
-
- #define INIT_VPACKETIZER( location, a,b,c,d ) \
- COMMON_INIT_PACKETIZER(location ); \
- es_format_Init( &location->fmt_in, VIDEO_ES, \
- VLC_FOURCC( a, b, c, d ) );
-
- /* BEWARE ! This can lead to memory leaks ! */
- #define LOAD_PACKETIZER_OR_FAIL( location, msg ) \
- location->p_module = \
- module_Need( location, "packetizer", NULL, 0 ); \
- if( location->p_module == NULL ) \
- { \
- vlc_object_release( location ); \
- msg_Err( p_demux, "cannot find packetizer for " # msg ); \
- free( p_sys ); \
- return VLC_EGENERIC; \
- }
-
- #define DESTROY_PACKETIZER( location ) \
- if( location->p_module ) module_Unneed( location, location->p_module ); \
- vlc_object_release( location );
-
- /**
- * @}
- */
-
- #endif
-