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vlc/include/vlc_demux.h
Rémi Denis-Courmont 7a15955acd Add SNR and signal level for access_demux 
In particular, V4L is (usually) an access_demux rather than an access.
2012-05-11 00:01:53 +03:00

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/*****************************************************************************
* vlc_demux.h: Demuxer descriptor, queries and methods
*****************************************************************************
* Copyright (C) 1999-2005 VLC authors and VideoLAN
* $Id$
*
* 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 Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
*
* 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.
*****************************************************************************/
#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_location;
char *psz_file;
/* 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;
/* Weak link to parent input */
input_thread_t *p_input;
};
/* demux_meta_t is returned by "meta reader" module to the demuxer */
typedef struct demux_meta_t
{
VLC_COMMON_MEMBERS
demux_t *p_demux; /** FIXME: use stream_t instead? */
input_item_t *p_item; /***< the input item that is being read */
vlc_meta_t *p_meta; /**< meta data */
int i_attachments; /**< number of attachments */
input_attachment_t **attachments; /**< array of attachments */
} demux_meta_t;
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 arg2= bool b_precise 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 arg2= bool b_precise 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 hint 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, arg2=const vlc_list_t * 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 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 */
/* RECORD you are ensured that it is never called twice with the same state
* you should accept it only if the stream can be recorded without
* any modification or header addition. */
DEMUX_CAN_RECORD, /* arg1=bool* res=can fail(assume false) */
DEMUX_SET_RECORD_STATE, /* arg1=bool res=can fail */
/* II. Specific access_demux queries */
/* PAUSE you are ensured that it is never called twice with the same state */
DEMUX_CAN_PAUSE = 0x1000, /* 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)*/
DEMUX_GET_SIGNAL, /* arg1= double * arg2= double * can fail */
};
VLC_API int demux_vaControlHelper( stream_t *, int64_t i_start, int64_t i_end, int64_t i_bitrate, int i_align, int i_query, va_list args );
/*************************************************************************
* Miscellaneous helpers for demuxers
*************************************************************************/
VLC_USED
static inline bool demux_IsPathExtension( demux_t *p_demux, const char *psz_extension )
{
if( !p_demux->psz_file )
return false;
const char *psz_ext = strrchr ( p_demux->psz_file, '.' );
if( !psz_ext || strcasecmp( psz_ext, psz_extension ) )
return false;
return true;
}
VLC_USED
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;
}
/**
* This function will create a packetizer suitable for a demuxer that parses
* elementary stream.
*
* The provided es_format_t will be cleaned on error or by
* demux_PacketizerDestroy.
*/
VLC_API decoder_t * demux_PacketizerNew( demux_t *p_demux, es_format_t *p_fmt, const char *psz_msg ) VLC_USED;
/**
* This function will destroy a packetizer create by demux_PacketizerNew.
*/
VLC_API void demux_PacketizerDestroy( decoder_t *p_packetizer );
/**
* This function will return the parent input of this demux.
* It is retained. Can return NULL.
*/
VLC_API input_thread_t * demux_GetParentInput( demux_t *p_demux ) VLC_USED;
/* */
#define DEMUX_INIT_COMMON() do { \
p_demux->pf_control = Control; \
p_demux->pf_demux = Demux; \
p_demux->p_sys = calloc( 1, sizeof( demux_sys_t ) ); \
if( !p_demux->p_sys ) return VLC_ENOMEM;\
} while(0)
/**
* @}
*/
#endif
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