research.m1stereo.tv/gitweb/ - melted/blob - src/framework/mlt_parser.c

   1 /**
   2  * \file mlt_parser.c
   3  * \brief service parsing functionality
   4  * \see mlt_parser_s
   5  *
   6  * Copyright (C) 2003-2009 Ushodaya Enterprises Limited
   7  * \author Charles Yates <charles.yates@pandora.be>
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23
  24 #include "mlt.h"
  25 #include <stdlib.h>
  26
  27 static int on_invalid( mlt_parser this, mlt_service object )
  28 {
  29         return 0;
  30 }
  31
  32 static int on_unknown( mlt_parser this, mlt_service object )
  33 {
  34         return 0;
  35 }
  36
  37 static int on_start_producer( mlt_parser this, mlt_producer object )
  38 {
  39         return 0;
  40 }
  41
  42 static int on_end_producer( mlt_parser this, mlt_producer object )
  43 {
  44         return 0;
  45 }
  46
  47 static int on_start_playlist( mlt_parser this, mlt_playlist object )
  48 {
  49         return 0;
  50 }
  51
  52 static int on_end_playlist( mlt_parser this, mlt_playlist object )
  53 {
  54         return 0;
  55 }
  56
  57 static int on_start_tractor( mlt_parser this, mlt_tractor object )
  58 {
  59         return 0;
  60 }
  61
  62 static int on_end_tractor( mlt_parser this, mlt_tractor object )
  63 {
  64         return 0;
  65 }
  66
  67 static int on_start_multitrack( mlt_parser this, mlt_multitrack object )
  68 {
  69         return 0;
  70 }
  71
  72 static int on_end_multitrack( mlt_parser this, mlt_multitrack object )
  73 {
  74         return 0;
  75 }
  76
  77 static int on_start_track( mlt_parser this )
  78 {
  79         return 0;
  80 }
  81
  82 static int on_end_track( mlt_parser this )
  83 {
  84         return 0;
  85 }
  86
  87 static int on_start_filter( mlt_parser this, mlt_filter object )
  88 {
  89         return 0;
  90 }
  91
  92 static int on_end_filter( mlt_parser this, mlt_filter object )
  93 {
  94         return 0;
  95 }
  96
  97 static int on_start_transition( mlt_parser this, mlt_transition object )
  98 {
  99         return 0;
 100 }
 101
 102 static int on_end_transition( mlt_parser this, mlt_transition object )
 103 {
 104         return 0;
 105 }
 106
 107 mlt_parser mlt_parser_new( )
 108 {
 109         mlt_parser this = calloc( 1, sizeof( struct mlt_parser_s ) );
 110         if ( this != NULL && mlt_properties_init( &this->parent, this ) == 0 )
 111         {
 112                 this->on_invalid = on_invalid;
 113                 this->on_unknown = on_unknown;
 114                 this->on_start_producer = on_start_producer;
 115                 this->on_end_producer = on_end_producer;
 116                 this->on_start_playlist = on_start_playlist;
 117                 this->on_end_playlist = on_end_playlist;
 118                 this->on_start_tractor = on_start_tractor;
 119                 this->on_end_tractor = on_end_tractor;
 120                 this->on_start_multitrack = on_start_multitrack;
 121                 this->on_end_multitrack = on_end_multitrack;
 122                 this->on_start_track = on_start_track;
 123                 this->on_end_track = on_end_track;
 124                 this->on_start_filter = on_start_filter;
 125                 this->on_end_filter = on_end_filter;
 126                 this->on_start_transition = on_start_transition;
 127                 this->on_end_transition = on_end_transition;
 128         }
 129         return this;
 130 }
 131
 132 mlt_properties mlt_parser_properties( mlt_parser this )
 133 {
 134         return &this->parent;
 135 }
 136
 137 int mlt_parser_start( mlt_parser this, mlt_service object )
 138 {
 139         int error = 0;
 140         mlt_service_type type = mlt_service_identify( object );
 141         switch( type )
 142         {
 143                 case invalid_type:
 144                         error = this->on_invalid( this, object );
 145                         break;
 146                 case unknown_type:
 147                         error = this->on_unknown( this, object );
 148                         break;
 149                 case producer_type:
 150                         if ( mlt_producer_is_cut( ( mlt_producer )object ) )
 151                                 error = mlt_parser_start( this, ( mlt_service )mlt_producer_cut_parent( ( mlt_producer )object ) );
 152                         error = this->on_start_producer( this, ( mlt_producer )object );
 153                         if ( error == 0 )
 154                         {
 155                                 int i = 0;
 156                                 while ( error == 0 && mlt_producer_filter( ( mlt_producer )object, i ) != NULL )
 157                                         error = mlt_parser_start( this, ( mlt_service )mlt_producer_filter( ( mlt_producer )object, i ++ ) );
 158                         }
 159                         error = this->on_end_producer( this, ( mlt_producer )object );
 160                         break;
 161                 case playlist_type:
 162                         error = this->on_start_playlist( this, ( mlt_playlist )object );
 163                         if ( error == 0 )
 164                         {
 165                                 int i = 0;
 166                                 while ( error == 0 && i < mlt_playlist_count( ( mlt_playlist )object ) )
 167                                         mlt_parser_start( this, ( mlt_service )mlt_playlist_get_clip( ( mlt_playlist )object, i ++ ) );
 168                                 i = 0;
 169                                 while ( error == 0 && mlt_producer_filter( ( mlt_producer )object, i ) != NULL )
 170                                         error = mlt_parser_start( this, ( mlt_service )mlt_producer_filter( ( mlt_producer )object, i ++ ) );
 171                         }
 172                         error = this->on_end_playlist( this, ( mlt_playlist )object );
 173                         break;
 174                 case tractor_type:
 175                         error = this->on_start_tractor( this, ( mlt_tractor )object );
 176                         if ( error == 0 )
 177                         {
 178                                 int i = 0;
 179                                 mlt_service next = mlt_service_producer( object );
 180                                 mlt_parser_start( this, ( mlt_service )mlt_tractor_multitrack( ( mlt_tractor )object ) );
 181                                 while ( next != ( mlt_service )mlt_tractor_multitrack( ( mlt_tractor )object ) )
 182                                 {
 183                                         mlt_parser_start( this, next );
 184                                         next = mlt_service_producer( next );
 185                                 }
 186                                 while ( error == 0 && mlt_producer_filter( ( mlt_producer )object, i ) != NULL )
 187                                         error = mlt_parser_start( this, ( mlt_service )mlt_producer_filter( ( mlt_producer )object, i ++ ) );
 188                         }
 189                         error = this->on_end_tractor( this, ( mlt_tractor )object );
 190                         break;
 191                 case multitrack_type:
 192                         error = this->on_start_multitrack( this, ( mlt_multitrack )object );
 193                         if ( error == 0 )
 194                         {
 195                                 int i = 0;
 196                                 while ( i < mlt_multitrack_count( ( mlt_multitrack )object ) )
 197                                 {
 198                                         this->on_start_track( this );
 199                                         mlt_parser_start( this, ( mlt_service )mlt_multitrack_track( ( mlt_multitrack )object , i ++ ) );
 200                                         this->on_end_track( this );
 201                                 }
 202                                 i = 0;
 203                                 while ( error == 0 && mlt_producer_filter( ( mlt_producer )object, i ) != NULL )
 204                                         error = mlt_parser_start( this, ( mlt_service )mlt_producer_filter( ( mlt_producer )object, i ++ ) );
 205                         }
 206                         error = this->on_end_multitrack( this, ( mlt_multitrack )object );
 207                         break;
 208                 case filter_type:
 209                         error = this->on_start_filter( this, ( mlt_filter )object );
 210                         if ( error == 0 )
 211                         {
 212                                 int i = 0;
 213                                 while ( error == 0 && mlt_producer_filter( ( mlt_producer )object, i ) != NULL )
 214                                         error = mlt_parser_start( this, ( mlt_service )mlt_producer_filter( ( mlt_producer )object, i ++ ) );
 215                         }
 216                         error = this->on_end_filter( this, ( mlt_filter )object );
 217                         break;
 218                 case transition_type:
 219                         error = this->on_start_transition( this, ( mlt_transition )object );
 220                         if ( error == 0 )
 221                         {
 222                                 int i = 0;
 223                                 while ( error == 0 && mlt_producer_filter( ( mlt_producer )object, i ) != NULL )
 224                                         error = mlt_parser_start( this, ( mlt_service )mlt_producer_filter( ( mlt_producer )object, i ++ ) );
 225                         }
 226                         error = this->on_end_transition( this, ( mlt_transition )object );
 227                         break;
 228                 case field_type:
 229                         break;
 230                 case consumer_type:
 231                         break;
 232         }
 233         return error;
 234 }
 235
 236 void mlt_parser_close( mlt_parser this )
 237 {
 238         if ( this != NULL )
 239         {
 240                 mlt_properties_close( &this->parent );
 241                 free( this );
 242         }
 243 }
 244
 245