2 /*****************************************************************************
3 * mkv.cpp : 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 *****************************************************************************/
25 #include "Ebml_parser.hpp"
27 /*****************************************************************************
29 *****************************************************************************/
30 EbmlParser::EbmlParser( EbmlStream *es, EbmlElement *el_start, demux_t *p_demux )
37 mi_remain_size[0] = el_start->GetSize();
39 for( i = 1; i < 6; i++ )
46 mb_dummy = var_InheritInteger( p_demux, "mkv-use-dummy" );
49 EbmlParser::~EbmlParser( void )
53 for( i = 1; i < mi_level; i++ )
63 EbmlElement* EbmlParser::UnGet( uint64 i_block_pos, uint64 i_cluster_pos )
65 if ( mi_user_level > mi_level )
67 while ( mi_user_level != mi_level )
69 delete m_el[mi_user_level];
70 m_el[mi_user_level] = NULL;
76 if ( m_el[1]->GetElementPosition() == i_cluster_pos )
78 m_es->I_O().setFilePointer( i_block_pos, seek_beginning );
79 return (EbmlMaster*) m_el[1];
83 // seek to the previous Cluster
84 m_es->I_O().setFilePointer( i_cluster_pos, seek_beginning );
87 delete m_el[mi_level];
88 m_el[mi_level] = NULL;
93 void EbmlParser::Up( void )
95 if( mi_user_level == mi_level )
97 fprintf( stderr," arrrrrrrrrrrrrg Up cannot escape itself\n" );
103 void EbmlParser::Down( void )
109 void EbmlParser::Keep( void )
114 int EbmlParser::GetLevel( void )
116 return mi_user_level;
119 void EbmlParser::Reset( demux_t *p_demux )
121 while ( mi_level > 0)
123 delete m_el[mi_level];
124 m_el[mi_level] = NULL;
127 mi_user_level = mi_level = 1;
128 // a little faster and cleaner
129 m_es->I_O().setFilePointer( static_cast<KaxSegment*>(m_el[0])->GetGlobalPosition(0) );
130 mb_dummy = var_InheritInteger( p_demux, "mkv-use-dummy" );
134 /* This function workarounds a bug in KaxBlockVirtual implementation */
135 class KaxBlockVirtualWorkaround : public KaxBlockVirtual
140 if( Data == DataBlock )
141 SetBuffer( NULL, 0 );
145 EbmlElement *EbmlParser::Get( void )
149 if( mi_user_level != mi_level )
155 EbmlElement *ret = m_got;
163 m_el[mi_level]->SkipData( *m_es, m_el[mi_level]->Generic().Context );
166 if( MKV_IS_ID( m_el[mi_level], KaxBlockVirtual ) )
167 static_cast<KaxBlockVirtualWorkaround*>(m_el[mi_level])->Fix();
168 delete m_el[mi_level];
173 m_el[mi_level] = m_es->FindNextElement( m_el[mi_level - 1]->Generic().Context, i_ulev, 0xFFFFFFFFL, mb_dummy != 0, 1 );
174 // mi_remain_size[mi_level] = m_el[mi_level]->GetSize();
185 delete m_el[mi_level - 1];
186 m_got = m_el[mi_level -1] = m_el[mi_level];
187 m_el[mi_level] = NULL;
194 else if( m_el[mi_level] == NULL )
196 fprintf( stderr," m_el[mi_level] == NULL\n" );
199 return m_el[mi_level];
202 bool EbmlParser::IsTopPresent( EbmlElement *el )
204 for( int i = 0; i < mi_level; i++ )
206 if( m_el[i] && m_el[i] == el )