/***************************************************************************** * vlc_demux.h: Demuxer descriptor, queries and methods ***************************************************************************** * Copyright (C) 1999-2005 the VideoLAN team * $Id: bc6caff60f29aec8388908175a44a71bd65d7979 $ * * 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, 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 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 */    /* RECORD 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 */    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)*/};VLC_EXPORT( 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 *************************************************************************/LIBVLC_USEDstatic 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;}LIBVLC_USEDstatic 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_EXPORT( decoder_t *,demux_PacketizerNew, ( demux_t *p_demux, es_format_t *p_fmt, const char *psz_msg ) );/** * This function will destroy a packetizer create by demux_PacketizerNew. */VLC_EXPORT( void, demux_PacketizerDestroy, ( decoder_t *p_packetizer ) );/* */#define DEMUX_INIT_COMMON() do {            \    p_demux->pf_control = Control;          \    p_demux->pf_demux = Demux;              \    p_demux->p_sys = malloc( sizeof( demux_sys_t ) ); \    if( !p_demux->p_sys ) return VLC_ENOMEM;\    memset( p_demux->p_sys, 0, sizeof( demux_sys_t ) ); } while(0)/** * @} */#endif