2 /*****************************************************************************
3 * EbmlParser for the matroska demuxer
4 *****************************************************************************
5 * Copyright (C) 2003-2004 the VideoLAN team
8 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
9 * Steve Lhomme <steve.lhomme@free.fr>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
24 *****************************************************************************/
26 #include "Ebml_parser.hpp"
28 /*****************************************************************************
30 *****************************************************************************/
31 EbmlParser::EbmlParser( EbmlStream *es, EbmlElement *el_start, demux_t *p_demux )
36 mi_remain_size[0] = el_start->GetSize();
38 for( int i = 1; i < 6; i++ )
45 mb_dummy = var_InheritInteger( p_demux, "mkv-use-dummy" );
48 EbmlParser::~EbmlParser( void )
50 for( int i = 1; i < mi_level; i++ )
60 EbmlElement* EbmlParser::UnGet( uint64 i_block_pos, uint64 i_cluster_pos )
62 if ( mi_user_level > mi_level )
64 while ( mi_user_level != mi_level )
66 delete m_el[mi_user_level];
67 m_el[mi_user_level] = NULL;
73 if ( m_el[1]->GetElementPosition() == i_cluster_pos )
75 m_es->I_O().setFilePointer( i_block_pos, seek_beginning );
76 return (EbmlMaster*) m_el[1];
80 // seek to the previous Cluster
81 m_es->I_O().setFilePointer( i_cluster_pos, seek_beginning );
84 delete m_el[mi_level];
85 m_el[mi_level] = NULL;
90 void EbmlParser::Up( void )
92 if( mi_user_level == mi_level )
94 fprintf( stderr,"MKV/Ebml Parser: Up cannot escape itself\n" );
100 void EbmlParser::Down( void )
106 void EbmlParser::Keep( void )
111 int EbmlParser::GetLevel( void )
113 return mi_user_level;
116 void EbmlParser::Reset( demux_t *p_demux )
118 while ( mi_level > 0)
120 delete m_el[mi_level];
121 m_el[mi_level] = NULL;
124 mi_user_level = mi_level = 1;
125 // a little faster and cleaner
126 m_es->I_O().setFilePointer( static_cast<KaxSegment*>(m_el[0])->GetGlobalPosition(0) );
127 mb_dummy = var_InheritInteger( p_demux, "mkv-use-dummy" );
130 EbmlElement *EbmlParser::Get( void )
134 if( mi_user_level != mi_level )
140 EbmlElement *ret = m_got;
148 m_el[mi_level]->SkipData( *m_es, m_el[mi_level]->Generic().Context );
151 if( MKV_IS_ID( m_el[mi_level], KaxBlockVirtual ) )
152 static_cast<KaxBlockVirtualWorkaround*>(m_el[mi_level])->Fix();
153 delete m_el[mi_level];
158 m_el[mi_level] = m_es->FindNextElement( m_el[mi_level - 1]->Generic().Context, i_ulev, 0xFFFFFFFFL, mb_dummy != 0, 1 );
159 // mi_remain_size[mi_level] = m_el[mi_level]->GetSize();
170 delete m_el[mi_level - 1];
171 m_got = m_el[mi_level -1] = m_el[mi_level];
172 m_el[mi_level] = NULL;
179 else if( m_el[mi_level] == NULL )
181 fprintf( stderr,"MKV/Ebml Parser: m_el[mi_level] == NULL\n" );
184 return m_el[mi_level];
187 bool EbmlParser::IsTopPresent( EbmlElement *el )
189 for( int i = 0; i < mi_level; i++ )
191 if( m_el[i] && m_el[i] == el )