257 lines
9.6 KiB
C
257 lines
9.6 KiB
C
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/*****************************************************************************
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* vlc_demux.h: Demuxer descriptor, queries and methods
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*****************************************************************************
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* Copyright (C) 1999-2005 VLC authors and VideoLAN
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* $Id: 0dcee0dffe2ac9dafdc9fe8fd5fa363a64cb85e1 $
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*
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* Authors: Laurent Aimar <fenrir@via.ecp.fr>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifndef VLC_DEMUX_H
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#define VLC_DEMUX_H 1
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/**
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* \file
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* This files defines functions and structures used by demux objects in vlc
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*/
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#include <vlc_es.h>
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#include <vlc_stream.h>
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#include <vlc_es_out.h>
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/**
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* \defgroup demux Demux
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* @{
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*/
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struct demux_t
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{
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VLC_COMMON_MEMBERS
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/* Module properties */
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module_t *p_module;
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/* eg informative but needed (we can have access+demux) */
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char *psz_access;
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char *psz_demux;
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char *psz_location;
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char *psz_file;
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/* input stream */
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stream_t *s; /* NULL in case of a access+demux in one */
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/* es output */
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es_out_t *out; /* our p_es_out */
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/* set by demuxer */
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int (*pf_demux) ( demux_t * ); /* demux one frame only */
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int (*pf_control)( demux_t *, int i_query, va_list args);
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/* Demux has to maintain them uptodate
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* when it is responsible of seekpoint/title */
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struct
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{
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unsigned int i_update; /* Demux sets them on change,
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Input removes them once take into account*/
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/* Seekpoint/Title at demux level */
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int i_title; /* idem, start from 0 (could be menu) */
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int i_seekpoint; /* idem, start from 0 */
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} info;
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demux_sys_t *p_sys;
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/* Weak link to parent input */
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input_thread_t *p_input;
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};
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/* demux_t.info.i_update field */
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#define INPUT_UPDATE_TITLE 0x0010
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#define INPUT_UPDATE_SEEKPOINT 0x0020
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#define INPUT_UPDATE_META 0x0040
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#define INPUT_UPDATE_TITLE_LIST 0x0100
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/* demux_meta_t is returned by "meta reader" module to the demuxer */
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typedef struct demux_meta_t
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{
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VLC_COMMON_MEMBERS
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demux_t *p_demux; /** FIXME: use stream_t instead? */
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input_item_t *p_item; /***< the input item that is being read */
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vlc_meta_t *p_meta; /**< meta data */
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int i_attachments; /**< number of attachments */
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input_attachment_t **attachments; /**< array of attachments */
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} demux_meta_t;
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enum demux_query_e
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{
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/* I. Common queries to access_demux and demux */
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/* POSITION double between 0.0 and 1.0 */
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DEMUX_GET_POSITION, /* arg1= double * res= */
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DEMUX_SET_POSITION, /* arg1= double arg2= bool b_precise res=can fail */
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/* LENGTH/TIME in microsecond, 0 if unknown */
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DEMUX_GET_LENGTH, /* arg1= int64_t * res= */
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DEMUX_GET_TIME, /* arg1= int64_t * res= */
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DEMUX_SET_TIME, /* arg1= int64_t arg2= bool b_precise res=can fail */
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/* TITLE_INFO only if more than 1 title or 1 chapter */
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DEMUX_GET_TITLE_INFO, /* arg1=input_title_t*** arg2=int*
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arg3=int*pi_title_offset(0), arg4=int*pi_seekpoint_offset(0) can fail */
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/* TITLE/SEEKPOINT, only when TITLE_INFO succeed */
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DEMUX_SET_TITLE, /* arg1= int can fail */
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DEMUX_SET_SEEKPOINT, /* arg1= int can fail */
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/* DEMUX_SET_GROUP/SET_ES only a hint for demuxer (mainly DVB) to allow not
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* reading everything (you should not use this to call es_out_Control)
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* if you don't know what to do with it, just IGNORE it, it is safe(r)
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* -1 means all group, 0 default group (first es added) */
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DEMUX_SET_GROUP, /* arg1= int, arg2=const vlc_list_t * can fail */
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DEMUX_SET_ES, /* arg1= int can fail */
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/* Ask the demux to demux until the given date at the next pf_demux call
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* but not more (and not less, at the precision available of course).
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* XXX: not mandatory (except for subtitle demux) but will help a lot
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* for multi-input
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*/
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DEMUX_SET_NEXT_DEMUX_TIME, /* arg1= int64_t can fail */
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/* FPS for correct subtitles handling */
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DEMUX_GET_FPS, /* arg1= double * res=can fail */
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/* Meta data */
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DEMUX_GET_META, /* arg1= vlc_meta_t ** res=can fail */
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DEMUX_HAS_UNSUPPORTED_META, /* arg1= bool * res can fail */
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/* Attachments */
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DEMUX_GET_ATTACHMENTS, /* arg1=input_attachment_t***, int* res=can fail */
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/* RECORD you are ensured that it is never called twice with the same state
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* you should accept it only if the stream can be recorded without
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* any modification or header addition. */
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DEMUX_CAN_RECORD, /* arg1=bool* res=can fail(assume false) */
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DEMUX_SET_RECORD_STATE, /* arg1=bool res=can fail */
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DEMUX_GET_SIGNAL, /* arg1=double *pf_quality, arg2=double *pf_strength
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res=can fail */
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/* II. Specific access_demux queries */
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/* PAUSE you are ensured that it is never called twice with the same state */
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DEMUX_CAN_PAUSE = 0x1000, /* arg1= bool* can fail (assume false)*/
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DEMUX_SET_PAUSE_STATE, /* arg1= bool can fail */
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DEMUX_GET_PTS_DELAY, /* arg1= int64_t* cannot fail */
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/* DEMUX_CAN_CONTROL_PACE returns true (*pb_pace) if we can read the
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* data at our pace */
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DEMUX_CAN_CONTROL_PACE, /* arg1= bool*pb_pace can fail (assume false) */
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/* DEMUX_CAN_CONTROL_RATE is called only if DEMUX_CAN_CONTROL_PACE has returned false.
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* *pb_rate should be true when the rate can be changed (using DEMUX_SET_RATE)
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* *pb_ts_rescale should be true when the timestamps (pts/dts/pcr) have to be rescaled */
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DEMUX_CAN_CONTROL_RATE, /* arg1= bool*pb_rate arg2= bool*pb_ts_rescale can fail(assume false) */
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/* DEMUX_SET_RATE is called only if DEMUX_CAN_CONTROL_RATE has returned true.
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* It should return the value really used in *pi_rate */
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DEMUX_SET_RATE, /* arg1= int*pi_rate can fail */
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DEMUX_CAN_SEEK, /* arg1= bool* can fail (assume false)*/
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/* Navigation */
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DEMUX_NAV_ACTIVATE, /* res=can fail */
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DEMUX_NAV_UP, /* res=can fail */
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DEMUX_NAV_DOWN, /* res=can fail */
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DEMUX_NAV_LEFT, /* res=can fail */
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DEMUX_NAV_RIGHT, /* res=can fail */
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};
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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 );
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static inline void demux_UpdateTitleFromStream( demux_t *demux )
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{
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stream_t *s = demux->s;
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unsigned title, seekpoint;
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if( stream_Control( s, STREAM_GET_TITLE, &title ) == VLC_SUCCESS
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&& title != (unsigned)demux->info.i_title )
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{
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demux->info.i_title = title;
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demux->info.i_update |= INPUT_UPDATE_TITLE;
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}
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if( stream_Control( s, STREAM_GET_SEEKPOINT, &seekpoint ) == VLC_SUCCESS
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&& seekpoint != (unsigned)demux->info.i_seekpoint )
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{
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demux->info.i_seekpoint = seekpoint;
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demux->info.i_update |= INPUT_UPDATE_SEEKPOINT;
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}
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}
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/*************************************************************************
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* Miscellaneous helpers for demuxers
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*************************************************************************/
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VLC_USED
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static inline bool demux_IsPathExtension( demux_t *p_demux, const char *psz_extension )
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{
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const char *name = (p_demux->psz_file != NULL) ? p_demux->psz_file
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: p_demux->psz_location;
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const char *psz_ext = strrchr ( name, '.' );
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if( !psz_ext || strcasecmp( psz_ext, psz_extension ) )
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return false;
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return true;
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}
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VLC_USED
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static inline bool demux_IsForced( demux_t *p_demux, const char *psz_name )
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{
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if( !p_demux->psz_demux || strcmp( p_demux->psz_demux, psz_name ) )
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return false;
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return true;
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}
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/**
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* This function will create a packetizer suitable for a demuxer that parses
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* elementary stream.
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*
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* The provided es_format_t will be cleaned on error or by
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* demux_PacketizerDestroy.
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*/
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VLC_API decoder_t * demux_PacketizerNew( demux_t *p_demux, es_format_t *p_fmt, const char *psz_msg ) VLC_USED;
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/**
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* This function will destroy a packetizer create by demux_PacketizerNew.
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*/
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VLC_API void demux_PacketizerDestroy( decoder_t *p_packetizer );
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/**
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* This function will return the parent input of this demux.
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* It is retained. Can return NULL.
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*/
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VLC_API input_thread_t * demux_GetParentInput( demux_t *p_demux ) VLC_USED;
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/* */
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#define DEMUX_INIT_COMMON() do { \
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p_demux->pf_control = Control; \
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p_demux->pf_demux = Demux; \
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p_demux->p_sys = calloc( 1, sizeof( demux_sys_t ) ); \
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if( !p_demux->p_sys ) return VLC_ENOMEM;\
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} while(0)
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/**
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* @}
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*/
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#endif
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