mirror of
https://code.videolan.org/videolan/vlc
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511 lines
16 KiB
C
511 lines
16 KiB
C
/*****************************************************************************
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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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*
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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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#include <stdlib.h>
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#include <string.h>
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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 Demultiplexer
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* \ingroup input
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* Demultiplexers (file format parsers)
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* @{
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* \file
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* Demultiplexer modules interface
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*/
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/* pf_demux return values */
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#define VLC_DEMUXER_EOF 0
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#define VLC_DEMUXER_EGENERIC -1
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#define VLC_DEMUXER_SUCCESS 1
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/* DEMUX_TEST_AND_CLEAR flags */
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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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struct vlc_object_t obj;
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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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/**
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* Control query identifiers for use with demux_t.pf_control
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*
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* In the individual identifier description, the input stream refers to
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* demux_t.s if non-NULL, and the output refers to demux_t.out.
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*
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* A demuxer is synchronous if it only accesses its input stream and the
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* output from within its demux_t callbacks, i.e. demux.pf_demux and
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* demux_t.pf_control.
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*
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* A demuxer is threaded if it accesses either or both input and output
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* asynchronously.
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*
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* An access-demuxer is a demuxer without input, i.e. demux_t.s == NULL).
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*/
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enum demux_query_e
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{
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/** Checks whether the stream supports seeking.
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* Can fail if seeking is not supported (same as returning false).
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* \bug Failing should not be allowed.
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*
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* arg1 = bool * */
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DEMUX_CAN_SEEK,
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/** Checks whether (long) pause then stream resumption is supported.
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* Can fail only if synchronous and <b>not</b> an access-demuxer. The
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* underlying input stream then determines if pause is supported.
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* \bug Failing should not be allowed.
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*
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* arg1= bool * */
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DEMUX_CAN_PAUSE = 0x002,
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/** Whether the stream can be read at an arbitrary pace.
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* Cannot fail.
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*
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* arg1= bool * */
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DEMUX_CAN_CONTROL_PACE,
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/** Retrieves the PTS delay (roughly the default buffer duration).
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* Can fail only if synchronous and <b>not</b> an access-demuxer. The
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* underlying input stream then determines the PTS delay.
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*
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* arg1= vlc_tick_t * */
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DEMUX_GET_PTS_DELAY = 0x101,
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/** Retrieves stream meta-data.
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* Should fail if no meta-data were retrieved.
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*
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* arg1= vlc_meta_t * */
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DEMUX_GET_META = 0x105,
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/** Retrieves an estimate of signal quality and strength.
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* Can fail.
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*
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* arg1=double *quality, arg2=double *strength */
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DEMUX_GET_SIGNAL = 0x107,
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/** Sets the paused or playing/resumed state.
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*
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* Streams are initially in playing state. The control always specifies a
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* change from paused to playing (false) or from playing to paused (true)
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* and streams are initially playing; a no-op cannot be requested.
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*
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* The control is never used if DEMUX_CAN_PAUSE fails.
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* Can fail.
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*
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* arg1= bool */
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DEMUX_SET_PAUSE_STATE = 0x200,
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/** Seeks to the beginning of a title.
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*
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* The control is never used if DEMUX_GET_TITLE_INFO fails.
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* Can fail.
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*
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* arg1= int */
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DEMUX_SET_TITLE,
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/** Seeks to the beginning of a chapter of the current title.
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*
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* The control is never used if DEMUX_GET_TITLE_INFO fails.
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* Can fail.
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*
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* arg1= int */
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DEMUX_SET_SEEKPOINT, /* arg1= int can fail */
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/** Check which INPUT_UPDATE_XXX flag is set and reset the ones set.
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*
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* The unsigned* argument is set with the flags needed to be checked,
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* on return it contains the values that were reset during the call
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*
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* arg1= unsigned * */
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DEMUX_TEST_AND_CLEAR_FLAGS, /* arg1= unsigned* can fail */
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/** Read the title number currently playing
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*
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* Can fail.
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*
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* arg1= int * */
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DEMUX_GET_TITLE, /* arg1= int* can fail */
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/* Read the seekpoint/chapter currently playing
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*
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* Can fail.
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*
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* arg1= int * */
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DEMUX_GET_SEEKPOINT, /* arg1= int* can fail */
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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 = 0x300, /* 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= vlc_tick_t * res= */
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DEMUX_GET_TIME, /* arg1= vlc_tick_t * res= */
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DEMUX_SET_TIME, /* arg1= vlc_tick_t arg2= bool b_precise res=can fail */
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/**
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* \todo Document
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*
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* \warning The prototype is different from STREAM_GET_TITLE_INFO
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*
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* Can fail, meaning there is only one title and one chapter.
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*
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* arg1= input_title_t ***, arg2=int *, arg3=int *pi_title_offset(0),
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* arg4= int *pi_seekpoint_offset(0) */
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DEMUX_GET_TITLE_INFO,
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/* DEMUX_SET_GROUP_* / DEMUX_SET_ES is only a hint for demuxer (mainly DVB)
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* to avoid parsing everything (you should not use this to call
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* 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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DEMUX_SET_GROUP_DEFAULT,
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DEMUX_SET_GROUP_ALL,
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DEMUX_SET_GROUP_LIST, /* arg1= size_t, arg2= const int *, 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= vlc_tick_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_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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/**
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* \todo Document
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*
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* \warning The prototype is different from STREAM_SET_RECORD_STATE
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*
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* The control is never used if DEMUX_CAN_RECORD fails or returns false.
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* Can fail.
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*
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* arg1= bool */
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DEMUX_SET_RECORD_STATE,
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/* II. Specific access_demux queries */
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/* DEMUX_CAN_CONTROL_RATE is called only if DEMUX_CAN_CONTROL_PACE has
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* returned false. *pb_rate should be true when the rate can be changed
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* (using DEMUX_SET_RATE). */
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DEMUX_CAN_CONTROL_RATE, /* arg1= bool*pb_rate */
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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 *p_rate */
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DEMUX_SET_RATE, /* arg1= float*p_rate res=can fail */
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/** Checks whether the stream is actually a playlist, rather than a real
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* stream.
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*
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* Can fail if the stream is not a playlist (same as returning false).
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*
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* arg1= bool * */
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DEMUX_IS_PLAYLIST,
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/* Menu (VCD/DVD/BD) Navigation */
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/** Activate the navigation item selected. Can fail */
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DEMUX_NAV_ACTIVATE,
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/** Use the up arrow to select a navigation item above. Can fail */
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DEMUX_NAV_UP,
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/** Use the down arrow to select a navigation item under. Can fail */
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DEMUX_NAV_DOWN,
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/** Use the left arrow to select a navigation item on the left. Can fail */
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DEMUX_NAV_LEFT,
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/** Use the right arrow to select a navigation item on the right. Can fail */
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DEMUX_NAV_RIGHT,
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/** Activate the popup Menu (for BD). Can fail */
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DEMUX_NAV_POPUP,
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/** Activate disc Root Menu. Can fail */
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DEMUX_NAV_MENU, /* res=can fail */
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/** Enable/Disable a demux filter
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* \warning This has limited support, and is likely to break if more than
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* a single demux_filter is present in the chain. This is not guaranteed to
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* work in future VLC versions, nor with all demux filters
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*/
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DEMUX_FILTER_ENABLE,
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DEMUX_FILTER_DISABLE
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};
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/*************************************************************************
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* Main Demux
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*************************************************************************/
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VLC_API demux_t *demux_New( vlc_object_t *p_obj, const char *psz_name,
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stream_t *s, es_out_t *out );
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static inline void demux_Delete(demux_t *demux)
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{
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vlc_stream_Delete(demux);
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}
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VLC_API int demux_vaControlHelper( stream_t *, int64_t i_start, int64_t i_end,
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int64_t i_bitrate, int i_align, int i_query, va_list args );
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VLC_USED static inline int demux_Demux( demux_t *p_demux )
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{
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if( !p_demux->pf_demux )
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return VLC_DEMUXER_SUCCESS;
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return p_demux->pf_demux( p_demux );
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}
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VLC_API int demux_vaControl( demux_t *p_demux, int i_query, va_list args );
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static inline int demux_Control( demux_t *p_demux, int i_query, ... )
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{
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va_list args;
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int i_result;
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va_start( args, i_query );
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i_result = demux_vaControl( p_demux, i_query, args );
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va_end( args );
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return i_result;
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}
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/*************************************************************************
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* Miscellaneous helpers for demuxers
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*************************************************************************/
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#ifndef __cplusplus
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static inline void demux_UpdateTitleFromStream( demux_t *demux,
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int *restrict titlep, int *restrict seekpointp,
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unsigned *restrict updatep )
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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( vlc_stream_Control( s, STREAM_GET_TITLE, &title ) == VLC_SUCCESS
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&& title != (unsigned)*titlep )
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{
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*titlep = title;
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*updatep |= INPUT_UPDATE_TITLE;
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}
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if( vlc_stream_Control( s, STREAM_GET_SEEKPOINT,
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&seekpoint ) == VLC_SUCCESS
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&& seekpoint != (unsigned)*seekpointp )
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{
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*seekpointp = seekpoint;
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*updatep |= INPUT_UPDATE_SEEKPOINT;
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}
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}
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# define demux_UpdateTitleFromStream(demux) \
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demux_UpdateTitleFromStream(demux, \
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&((demux_sys_t *)((demux)->p_sys))->current_title, \
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&((demux_sys_t *)((demux)->p_sys))->current_seekpoint, \
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&((demux_sys_t *)((demux)->p_sys))->updates)
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#endif
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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_filepath != NULL) ? p_demux->psz_filepath
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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_IsContentType(demux_t *demux, const char *type)
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{
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return stream_IsMimeType(demux->s, type);
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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_name == NULL || strcmp( p_demux->psz_name, psz_name ) )
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return false;
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return true;
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}
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static inline int demux_SetPosition( demux_t *p_demux, double pos, bool precise,
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bool absolute)
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{
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if( !absolute )
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{
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double current_pos;
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int ret = demux_Control( p_demux, DEMUX_GET_POSITION, ¤t_pos );
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if( ret != VLC_SUCCESS )
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return ret;
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pos += current_pos;
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}
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if( pos < 0.f )
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pos = 0.f;
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else if( pos > 1.f )
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pos = 1.f;
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return demux_Control( p_demux, DEMUX_SET_POSITION, pos, precise );
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}
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static inline int demux_SetTime( demux_t *p_demux, vlc_tick_t time, bool precise,
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bool absolute )
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{
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if( !absolute )
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{
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vlc_tick_t current_time;
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int ret = demux_Control( p_demux, DEMUX_GET_TIME, ¤t_time );
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if( ret != VLC_SUCCESS )
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return ret;
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time += current_time;
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}
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if( time < 0 )
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time = 0;
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return demux_Control( p_demux, DEMUX_SET_TIME, time, precise );
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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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#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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* \defgroup chained_demux Chained demultiplexer
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* Demultiplexers wrapped by another demultiplexer
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* @{
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*/
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typedef struct vlc_demux_chained_t vlc_demux_chained_t;
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/**
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* Creates a chained demuxer.
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*
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* This creates a thread running a demuxer whose input stream is generated
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* directly by the caller. This typically handles some sort of stream within a
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* stream, e.g. MPEG-TS within something else.
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*
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* \note There are a number of limitations to this approach. The chained
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* demuxer is run asynchronously in a separate thread. Most demuxer controls
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* are synchronous and therefore unavailable in this case. Also the input
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* stream is a simple FIFO, so the chained demuxer cannot perform seeks.
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* Lastly, most errors cannot be detected.
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*
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* \param parent parent VLC object
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* \param name chained demux module name (e.g. "ts")
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* \param out elementary stream output for the chained demux
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* \return a non-NULL pointer on success, NULL on failure.
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*/
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VLC_API vlc_demux_chained_t *vlc_demux_chained_New(vlc_object_t *parent,
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const char *name,
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es_out_t *out);
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/**
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* Destroys a chained demuxer.
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*
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* Sends an end-of-stream to the chained demuxer, and releases all underlying
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* allocated resources.
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*/
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VLC_API void vlc_demux_chained_Delete(vlc_demux_chained_t *);
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/**
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* Sends data to a chained demuxer.
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*
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* This queues data for a chained demuxer to consume.
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*
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* \param block data block to queue
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*/
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VLC_API void vlc_demux_chained_Send(vlc_demux_chained_t *, block_t *block);
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/**
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* Controls a chained demuxer.
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*
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* This performs a <b>demux</b> (i.e. DEMUX_...) control request on a chained
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* demux.
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*
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* \note In most cases, vlc_demux_chained_Control() should be used instead.
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* \warning As per vlc_demux_chained_New(), most demux controls are not, and
|
|
* cannot be, supported; VLC_EGENERIC is returned.
|
|
*
|
|
* \param query demux control (see \ref demux_query_e)
|
|
* \param args variable arguments (depending on the query)
|
|
*/
|
|
VLC_API int vlc_demux_chained_ControlVa(vlc_demux_chained_t *, int query,
|
|
va_list args);
|
|
|
|
static inline int vlc_demux_chained_Control(vlc_demux_chained_t *dc, int query,
|
|
...)
|
|
{
|
|
va_list ap;
|
|
int ret;
|
|
|
|
va_start(ap, query);
|
|
ret = vlc_demux_chained_ControlVa(dc, query, ap);
|
|
va_end(ap);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
#endif
|