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628 lines
18 KiB
628 lines
18 KiB
/*****************************************************************************
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* ps.c: Program Stream demux module for VLC.
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*****************************************************************************
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* Copyright (C) 2004-2009 VLC authors and VideoLAN
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* $Id$
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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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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <vlc_common.h>
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#include <vlc_plugin.h>
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#include <vlc_demux.h>
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#include "ps.h"
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/* TODO:
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* - re-add pre-scanning.
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* - ...
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*/
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#define TIME_TEXT N_("Trust MPEG timestamps")
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#define TIME_LONGTEXT N_("Normally we use the timestamps of the MPEG files " \
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"to calculate position and duration. However sometimes this might not " \
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"be usable. Disable this option to calculate from the bitrate instead." )
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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static int OpenForce( vlc_object_t * );
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static int Open ( vlc_object_t * );
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static void Close ( vlc_object_t * );
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vlc_module_begin ()
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set_description( N_("MPEG-PS demuxer") )
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set_shortname( N_("PS") )
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set_category( CAT_INPUT )
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set_subcategory( SUBCAT_INPUT_DEMUX )
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set_capability( "demux", 1 )
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set_callbacks( OpenForce, Close )
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add_shortcut( "ps" )
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add_bool( "ps-trust-timestamps", true, TIME_TEXT,
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TIME_LONGTEXT, true )
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change_safe ()
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add_submodule ()
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set_description( N_("MPEG-PS demuxer") )
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set_capability( "demux", 8 )
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set_callbacks( Open, Close )
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add_shortcut( "ps" )
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vlc_module_end ()
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/*****************************************************************************
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* Local prototypes
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*****************************************************************************/
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struct demux_sys_t
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{
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ps_psm_t psm;
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ps_track_t tk[PS_TK_COUNT];
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int64_t i_scr;
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int64_t i_last_scr;
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int i_mux_rate;
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int64_t i_length;
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int i_time_track;
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int64_t i_current_pts;
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int i_aob_mlp_count;
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bool b_lost_sync;
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bool b_have_pack;
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bool b_seekable;
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};
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static int Demux ( demux_t *p_demux );
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static int Control( demux_t *p_demux, int i_query, va_list args );
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static int ps_pkt_resynch( stream_t *, uint32_t *pi_code );
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static block_t *ps_pkt_read ( stream_t *, uint32_t i_code );
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/*****************************************************************************
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* Open
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*****************************************************************************/
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static int OpenCommon( vlc_object_t *p_this, bool b_force )
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{
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demux_t *p_demux = (demux_t*)p_this;
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demux_sys_t *p_sys;
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const uint8_t *p_peek;
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if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 )
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{
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msg_Err( p_demux, "cannot peek" );
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return VLC_EGENERIC;
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}
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if( memcmp( p_peek, "\x00\x00\x01", 3 ) || ( p_peek[3] < 0xb9 ) )
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{
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if( !b_force )
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return VLC_EGENERIC;
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msg_Warn( p_demux, "this does not look like an MPEG PS stream, "
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"continuing anyway" );
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}
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/* Fill p_demux field */
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p_demux->pf_demux = Demux;
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p_demux->pf_control = Control;
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p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
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if( !p_sys ) return VLC_ENOMEM;
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/* Init p_sys */
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p_sys->i_mux_rate = 0;
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p_sys->i_scr = -1;
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p_sys->i_last_scr = -1;
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p_sys->i_length = -1;
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p_sys->i_current_pts = (mtime_t) 0;
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p_sys->i_time_track = -1;
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p_sys->i_aob_mlp_count = 0;
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p_sys->b_lost_sync = false;
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p_sys->b_have_pack = false;
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p_sys->b_seekable = false;
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stream_Control( p_demux->s, STREAM_CAN_SEEK, &p_sys->b_seekable );
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ps_psm_init( &p_sys->psm );
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ps_track_init( p_sys->tk );
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/* TODO prescanning of ES */
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return VLC_SUCCESS;
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}
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static int OpenForce( vlc_object_t *p_this )
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{
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return OpenCommon( p_this, true );
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}
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static int Open( vlc_object_t *p_this )
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{
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return OpenCommon( p_this, ((demux_t *)p_this)->b_force );
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}
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/*****************************************************************************
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* Close
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*****************************************************************************/
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static void Close( vlc_object_t *p_this )
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{
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demux_t *p_demux = (demux_t*)p_this;
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demux_sys_t *p_sys = p_demux->p_sys;
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int i;
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for( i = 0; i < PS_TK_COUNT; i++ )
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{
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ps_track_t *tk = &p_sys->tk[i];
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if( tk->b_seen )
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{
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es_format_Clean( &tk->fmt );
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if( tk->es ) es_out_Del( p_demux->out, tk->es );
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}
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}
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ps_psm_destroy( &p_sys->psm );
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free( p_sys );
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}
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static int Demux2( demux_t *p_demux, bool b_end )
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{
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demux_sys_t *p_sys = p_demux->p_sys;
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int i_ret, i_id;
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uint32_t i_code;
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block_t *p_pkt;
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i_ret = ps_pkt_resynch( p_demux->s, &i_code );
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if( i_ret < 0 )
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{
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return 0;
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}
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else if( i_ret == 0 )
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{
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if( !p_sys->b_lost_sync )
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msg_Warn( p_demux, "garbage at input, trying to resync..." );
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p_sys->b_lost_sync = true;
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return 1;
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}
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if( p_sys->b_lost_sync ) msg_Warn( p_demux, "found sync code" );
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p_sys->b_lost_sync = false;
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if( ( p_pkt = ps_pkt_read( p_demux->s, i_code ) ) == NULL )
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{
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return 0;
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}
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if( (i_id = ps_pkt_id( p_pkt )) >= 0xc0 )
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{
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ps_track_t *tk = &p_sys->tk[PS_ID_TO_TK(i_id)];
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if( !ps_pkt_parse_pes( p_pkt, tk->i_skip ) && p_pkt->i_pts > VLC_TS_INVALID )
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{
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if( b_end && p_pkt->i_pts > tk->i_last_pts )
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{
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tk->i_last_pts = p_pkt->i_pts;
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}
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else if ( tk->i_first_pts == -1 )
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{
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tk->i_first_pts = p_pkt->i_pts;
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}
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}
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}
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block_Release( p_pkt );
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return 1;
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}
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static void FindLength( demux_t *p_demux )
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{
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demux_sys_t *p_sys = p_demux->p_sys;
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int64_t i_current_pos = -1, i_size = 0, i_end = 0;
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if( !var_CreateGetBool( p_demux, "ps-trust-timestamps" ) )
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return;
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if( p_sys->i_length == -1 ) /* First time */
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{
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p_sys->i_length = 0;
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/* Check beginning */
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int i = 0;
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i_current_pos = stream_Tell( p_demux->s );
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while( vlc_object_alive (p_demux) && i < 40 && Demux2( p_demux, false ) > 0 ) i++;
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/* Check end */
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i_size = stream_Size( p_demux->s );
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i_end = VLC_CLIP( i_size, 0, 200000 );
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stream_Seek( p_demux->s, i_size - i_end );
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i = 0;
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while( vlc_object_alive (p_demux) && i < 40 && Demux2( p_demux, true ) > 0 ) i++;
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if( i_current_pos >= 0 ) stream_Seek( p_demux->s, i_current_pos );
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}
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/* Find the longest track */
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for( int i = 0; i < PS_TK_COUNT; i++ )
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{
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ps_track_t *tk = &p_sys->tk[i];
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if( tk->i_first_pts >= 0 && tk->i_last_pts > 0 &&
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tk->i_last_pts > tk->i_first_pts )
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{
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int64_t i_length = (int64_t)tk->i_last_pts - tk->i_first_pts;
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if( i_length > p_sys->i_length )
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{
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p_sys->i_length = i_length;
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p_sys->i_time_track = i;
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msg_Dbg( p_demux, "we found a length of: %"PRId64, p_sys->i_length );
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}
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}
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}
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}
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/*****************************************************************************
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* Demux:
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*****************************************************************************/
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static int Demux( demux_t *p_demux )
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{
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demux_sys_t *p_sys = p_demux->p_sys;
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int i_ret, i_id, i_mux_rate;
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uint32_t i_code;
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block_t *p_pkt;
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i_ret = ps_pkt_resynch( p_demux->s, &i_code );
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if( i_ret < 0 )
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{
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return 0;
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}
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else if( i_ret == 0 )
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{
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if( !p_sys->b_lost_sync )
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msg_Warn( p_demux, "garbage at input, trying to resync..." );
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p_sys->b_lost_sync = true;
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return 1;
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}
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if( p_sys->b_lost_sync ) msg_Warn( p_demux, "found sync code" );
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p_sys->b_lost_sync = false;
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if( p_sys->i_length < 0 && p_sys->b_seekable )
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FindLength( p_demux );
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if( ( p_pkt = ps_pkt_read( p_demux->s, i_code ) ) == NULL )
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{
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return 0;
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}
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switch( i_code )
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{
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case 0x1b9:
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block_Release( p_pkt );
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break;
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case 0x1ba:
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if( !ps_pkt_parse_pack( p_pkt, &p_sys->i_scr, &i_mux_rate ) )
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{
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p_sys->i_last_scr = p_sys->i_scr;
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if( !p_sys->b_have_pack ) p_sys->b_have_pack = true;
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/* done later on to work around bad vcd/svcd streams */
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/* es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_scr ); */
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if( i_mux_rate > 0 ) p_sys->i_mux_rate = i_mux_rate;
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}
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block_Release( p_pkt );
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break;
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case 0x1bb:
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if( !ps_pkt_parse_system( p_pkt, &p_sys->psm, p_sys->tk ) )
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{
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int i;
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for( i = 0; i < PS_TK_COUNT; i++ )
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{
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ps_track_t *tk = &p_sys->tk[i];
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if( tk->b_seen && !tk->es && tk->fmt.i_cat != UNKNOWN_ES )
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{
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tk->es = es_out_Add( p_demux->out, &tk->fmt );
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}
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}
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}
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block_Release( p_pkt );
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break;
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case 0x1bc:
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if( p_sys->psm.i_version == 0xFFFF )
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msg_Dbg( p_demux, "contains a PSM");
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ps_psm_fill( &p_sys->psm, p_pkt, p_sys->tk, p_demux->out );
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block_Release( p_pkt );
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break;
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default:
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if( (i_id = ps_pkt_id( p_pkt )) >= 0xc0 )
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{
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/* Small heuristic to improve MLP detection from AOB */
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if( i_id == 0xa001 &&
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p_sys->i_aob_mlp_count < 500 )
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{
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p_sys->i_aob_mlp_count++;
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}
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else if( i_id == 0xbda1 &&
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p_sys->i_aob_mlp_count > 0 )
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{
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p_sys->i_aob_mlp_count--;
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i_id = 0xa001;
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}
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bool b_new = false;
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ps_track_t *tk = &p_sys->tk[PS_ID_TO_TK(i_id)];
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if( !tk->b_seen )
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{
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if( !ps_track_fill( tk, &p_sys->psm, i_id ) )
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{
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tk->es = es_out_Add( p_demux->out, &tk->fmt );
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b_new = true;
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}
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else
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{
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msg_Dbg( p_demux, "es id=0x%x format unknown", i_id );
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}
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tk->b_seen = true;
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}
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/* The popular VCD/SVCD subtitling WinSubMux does not
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* renumber the SCRs when merging subtitles into the PES */
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if( tk->b_seen &&
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( tk->fmt.i_codec == VLC_CODEC_OGT ||
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tk->fmt.i_codec == VLC_CODEC_CVD ) )
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{
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p_sys->i_scr = -1;
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p_sys->i_last_scr = -1;
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}
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if( p_sys->i_scr >= 0 )
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es_out_Control( p_demux->out, ES_OUT_SET_PCR, VLC_TS_0 + p_sys->i_scr );
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p_sys->i_scr = -1;
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if( tk->b_seen && tk->es &&
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!ps_pkt_parse_pes( p_pkt, tk->i_skip ) )
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{
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if( !b_new && !p_sys->b_have_pack &&
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(tk->fmt.i_cat == AUDIO_ES) &&
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(p_pkt->i_pts > VLC_TS_INVALID) )
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{
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/* A hack to sync the A/V on PES files. */
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msg_Dbg( p_demux, "force SCR: %"PRId64, p_pkt->i_pts );
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es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_pkt->i_pts );
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}
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if( tk->fmt.i_codec == VLC_CODEC_TELETEXT &&
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p_pkt->i_pts <= VLC_TS_INVALID && p_sys->i_last_scr >= 0 )
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{
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/* Teletext may have missing PTS (ETSI EN 300 472 Annexe A)
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* In this case use the last SCR + 40ms */
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p_pkt->i_pts = VLC_TS_0 + p_sys->i_last_scr + 40000;
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}
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if( (int64_t)p_pkt->i_pts > p_sys->i_current_pts )
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{
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p_sys->i_current_pts = (int64_t)p_pkt->i_pts;
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}
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es_out_Send( p_demux->out, tk->es, p_pkt );
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}
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else
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{
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block_Release( p_pkt );
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}
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}
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else
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{
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block_Release( p_pkt );
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}
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break;
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}
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return 1;
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}
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/*****************************************************************************
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* Control:
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*****************************************************************************/
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static int Control( demux_t *p_demux, int i_query, va_list args )
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{
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demux_sys_t *p_sys = p_demux->p_sys;
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double f, *pf;
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int64_t i64, *pi64;
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switch( i_query )
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{
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case DEMUX_GET_POSITION:
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pf = (double*) va_arg( args, double* );
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i64 = stream_Size( p_demux->s );
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if( i64 > 0 )
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{
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double current = stream_Tell( p_demux->s );
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*pf = current / (double)i64;
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}
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else
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{
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*pf = 0.0;
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}
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return VLC_SUCCESS;
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case DEMUX_SET_POSITION:
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f = (double) va_arg( args, double );
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i64 = stream_Size( p_demux->s );
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p_sys->i_current_pts = 0;
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p_sys->i_last_scr = -1;
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return stream_Seek( p_demux->s, (int64_t)(i64 * f) );
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case DEMUX_GET_TIME:
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pi64 = (int64_t*)va_arg( args, int64_t * );
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if( p_sys->i_time_track >= 0 && p_sys->i_current_pts > 0 )
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{
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*pi64 = p_sys->i_current_pts - p_sys->tk[p_sys->i_time_track].i_first_pts;
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return VLC_SUCCESS;
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}
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if( p_sys->i_mux_rate > 0 )
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{
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|
*pi64 = (int64_t)1000000 * ( stream_Tell( p_demux->s ) / 50 ) /
|
|
p_sys->i_mux_rate;
|
|
return VLC_SUCCESS;
|
|
}
|
|
*pi64 = 0;
|
|
return VLC_EGENERIC;
|
|
|
|
case DEMUX_GET_LENGTH:
|
|
pi64 = (int64_t*)va_arg( args, int64_t * );
|
|
if( p_sys->i_length > 0 )
|
|
{
|
|
*pi64 = p_sys->i_length;
|
|
return VLC_SUCCESS;
|
|
}
|
|
else if( p_sys->i_mux_rate > 0 )
|
|
{
|
|
*pi64 = (int64_t)1000000 * ( stream_Size( p_demux->s ) / 50 ) /
|
|
p_sys->i_mux_rate;
|
|
return VLC_SUCCESS;
|
|
}
|
|
*pi64 = 0;
|
|
return VLC_EGENERIC;
|
|
|
|
case DEMUX_SET_TIME:
|
|
i64 = (int64_t)va_arg( args, int64_t );
|
|
if( p_sys->i_time_track >= 0 && p_sys->i_current_pts > 0 )
|
|
{
|
|
int64_t i_now = p_sys->i_current_pts - p_sys->tk[p_sys->i_time_track].i_first_pts;
|
|
int64_t i_pos = stream_Tell( p_demux->s );
|
|
|
|
if( !i_now )
|
|
return i64 ? VLC_EGENERIC : VLC_SUCCESS;
|
|
|
|
p_sys->i_current_pts = 0;
|
|
p_sys->i_last_scr = -1;
|
|
i_pos *= (float)i64 / (float)i_now;
|
|
stream_Seek( p_demux->s, i_pos );
|
|
return VLC_SUCCESS;
|
|
}
|
|
return VLC_EGENERIC;
|
|
|
|
case DEMUX_GET_FPS:
|
|
default:
|
|
return VLC_EGENERIC;
|
|
}
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* Divers:
|
|
*****************************************************************************/
|
|
|
|
/* PSResynch: resynch on a system startcode
|
|
* It doesn't skip more than 512 bytes
|
|
* -1 -> error, 0 -> not synch, 1 -> ok
|
|
*/
|
|
static int ps_pkt_resynch( stream_t *s, uint32_t *pi_code )
|
|
{
|
|
const uint8_t *p_peek;
|
|
int i_peek;
|
|
int i_skip;
|
|
|
|
if( stream_Peek( s, &p_peek, 4 ) < 4 )
|
|
{
|
|
return -1;
|
|
}
|
|
if( p_peek[0] == 0 && p_peek[1] == 0 && p_peek[2] == 1 &&
|
|
p_peek[3] >= 0xb9 )
|
|
{
|
|
*pi_code = 0x100 | p_peek[3];
|
|
return 1;
|
|
}
|
|
|
|
if( ( i_peek = stream_Peek( s, &p_peek, 512 ) ) < 4 )
|
|
{
|
|
return -1;
|
|
}
|
|
i_skip = 0;
|
|
|
|
for( ;; )
|
|
{
|
|
if( i_peek < 4 )
|
|
{
|
|
break;
|
|
}
|
|
if( p_peek[0] == 0 && p_peek[1] == 0 && p_peek[2] == 1 &&
|
|
p_peek[3] >= 0xb9 )
|
|
{
|
|
*pi_code = 0x100 | p_peek[3];
|
|
return stream_Read( s, NULL, i_skip ) == i_skip ? 1 : -1;
|
|
}
|
|
|
|
p_peek++;
|
|
i_peek--;
|
|
i_skip++;
|
|
}
|
|
return stream_Read( s, NULL, i_skip ) == i_skip ? 0 : -1;
|
|
}
|
|
|
|
static block_t *ps_pkt_read( stream_t *s, uint32_t i_code )
|
|
{
|
|
const uint8_t *p_peek;
|
|
int i_peek = stream_Peek( s, &p_peek, 14 );
|
|
if( i_peek < 4 )
|
|
return NULL;
|
|
|
|
int i_size = ps_pkt_size( p_peek, i_peek );
|
|
if( i_size <= 6 && p_peek[3] > 0xba )
|
|
{
|
|
/* Special case, search the next start code */
|
|
i_size = 6;
|
|
for( ;; )
|
|
{
|
|
i_peek = stream_Peek( s, &p_peek, i_size + 1024 );
|
|
if( i_peek <= i_size + 4 )
|
|
{
|
|
return NULL;
|
|
}
|
|
while( i_size <= i_peek - 4 )
|
|
{
|
|
if( p_peek[i_size] == 0x00 && p_peek[i_size+1] == 0x00 &&
|
|
p_peek[i_size+2] == 0x01 && p_peek[i_size+3] >= 0xb9 )
|
|
{
|
|
return stream_Block( s, i_size );
|
|
}
|
|
i_size++;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Normal case */
|
|
return stream_Block( s, i_size );
|
|
}
|
|
|
|
VLC_UNUSED(i_code);
|
|
return NULL;
|
|
}
|
|
|