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

   1 /**
   2  * \file mlt_parser.c
   3  * \brief service parsing functionality
   4  *
   5  * Copyright (C) 2003-2008 Ushodaya Enterprises Limited
   6  * \author Charles Yates <charles.yates@pandora.be>
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include "mlt.h"
  24 #include <stdlib.h>
  25
  26 static int on_invalid( mlt_parser this, mlt_service object )
  27 {
  28         return 0;
  29 }
  30
  31 static int on_unknown( mlt_parser this, mlt_service object )
  32 {
  33         return 0;
  34 }
  35
  36 static int on_start_producer( mlt_parser this, mlt_producer object )
  37 {
  38         return 0;
  39 }
  40
  41 static int on_end_producer( mlt_parser this, mlt_producer object )
  42 {
  43         return 0;
  44 }
  45
  46 static int on_start_playlist( mlt_parser this, mlt_playlist object )
  47 {
  48         return 0;
  49 }
  50
  51 static int on_end_playlist( mlt_parser this, mlt_playlist object )
  52 {
  53         return 0;
  54 }
  55
  56 static int on_start_tractor( mlt_parser this, mlt_tractor object )
  57 {
  58         return 0;
  59 }
  60
  61 static int on_end_tractor( mlt_parser this, mlt_tractor object )
  62 {
  63         return 0;
  64 }
  65
  66 static int on_start_multitrack( mlt_parser this, mlt_multitrack object )
  67 {
  68         return 0;
  69 }
  70
  71 static int on_end_multitrack( mlt_parser this, mlt_multitrack object )
  72 {
  73         return 0;
  74 }
  75
  76 static int on_start_track( mlt_parser this )
  77 {
  78         return 0;
  79 }
  80
  81 static int on_end_track( mlt_parser this )
  82 {
  83         return 0;
  84 }
  85
  86 static int on_start_filter( mlt_parser this, mlt_filter object )
  87 {
  88         return 0;
  89 }
  90
  91 static int on_end_filter( mlt_parser this, mlt_filter object )
  92 {
  93         return 0;
  94 }
  95
  96 static int on_start_transition( mlt_parser this, mlt_transition object )
  97 {
  98         return 0;
  99 }
 100
 101 static int on_end_transition( mlt_parser this, mlt_transition object )
 102 {
 103         return 0;
 104 }
 105
 106 mlt_parser mlt_parser_new( )
 107 {
 108         mlt_parser this = calloc( 1, sizeof( struct mlt_parser_s ) );
 109         if ( this != NULL && mlt_properties_init( &this->parent, this ) == 0 )
 110         {
 111                 this->on_invalid = on_invalid;
 112                 this->on_unknown = on_unknown;
 113                 this->on_start_producer = on_start_producer;
 114                 this->on_end_producer = on_end_producer;
 115                 this->on_start_playlist = on_start_playlist;
 116                 this->on_end_playlist = on_end_playlist;
 117                 this->on_start_tractor = on_start_tractor;
 118                 this->on_end_tractor = on_end_tractor;
 119                 this->on_start_multitrack = on_start_multitrack;
 120                 this->on_end_multitrack = on_end_multitrack;
 121                 this->on_start_track = on_start_track;
 122                 this->on_end_track = on_end_track;
 123                 this->on_start_filter = on_start_filter;
 124                 this->on_end_filter = on_end_filter;
 125                 this->on_start_transition = on_start_transition;
 126                 this->on_end_transition = on_end_transition;
 127         }
 128         return this;
 129 }
 130
 131 mlt_properties mlt_parser_properties( mlt_parser this )
 132 {
 133         return &this->parent;
 134 }
 135
 136 int mlt_parser_start( mlt_parser this, mlt_service object )
 137 {
 138         int error = 0;
 139         mlt_service_type type = mlt_service_identify( object );
 140         switch( type )
 141         {
 142                 case invalid_type:
 143                         error = this->on_invalid( this, object );
 144                         break;
 145                 case unknown_type:
 146                         error = this->on_unknown( this, object );
 147                         break;
 148                 case producer_type:
 149                         if ( mlt_producer_is_cut( ( mlt_producer )object ) )
 150                                 error = mlt_parser_start( this, ( mlt_service )mlt_producer_cut_parent( ( mlt_producer )object ) );
 151                         error = this->on_start_producer( this, ( mlt_producer )object );
 152                         if ( error == 0 )
 153                         {
 154                                 int i = 0;
 155                                 while ( error == 0 && mlt_producer_filter( ( mlt_producer )object, i ) != NULL )
 156                                         error = mlt_parser_start( this, ( mlt_service )mlt_producer_filter( ( mlt_producer )object, i ++ ) );
 157                         }
 158                         error = this->on_end_producer( this, ( mlt_producer )object );
 159                         break;
 160                 case playlist_type:
 161                         error = this->on_start_playlist( this, ( mlt_playlist )object );
 162                         if ( error == 0 )
 163                         {
 164                                 int i = 0;
 165                                 while ( error == 0 && i < mlt_playlist_count( ( mlt_playlist )object ) )
 166                                         mlt_parser_start( this, ( mlt_service )mlt_playlist_get_clip( ( mlt_playlist )object, i ++ ) );
 167                                 i = 0;
 168                                 while ( error == 0 && mlt_producer_filter( ( mlt_producer )object, i ) != NULL )
 169                                         error = mlt_parser_start( this, ( mlt_service )mlt_producer_filter( ( mlt_producer )object, i ++ ) );
 170                         }
 171                         error = this->on_end_playlist( this, ( mlt_playlist )object );
 172                         break;
 173                 case tractor_type:
 174                         error = this->on_start_tractor( this, ( mlt_tractor )object );
 175                         if ( error == 0 )
 176                         {
 177                                 int i = 0;
 178                                 mlt_service next = mlt_service_producer( object );
 179                                 mlt_parser_start( this, ( mlt_service )mlt_tractor_multitrack( ( mlt_tractor )object ) );
 180                                 while ( next != ( mlt_service )mlt_tractor_multitrack( ( mlt_tractor )object ) )
 181                                 {
 182                                         mlt_parser_start( this, next );
 183                                         next = mlt_service_producer( next );
 184                                 }
 185                                 while ( error == 0 && mlt_producer_filter( ( mlt_producer )object, i ) != NULL )
 186                                         error = mlt_parser_start( this, ( mlt_service )mlt_producer_filter( ( mlt_producer )object, i ++ ) );
 187                         }
 188                         error = this->on_end_tractor( this, ( mlt_tractor )object );
 189                         break;
 190                 case multitrack_type:
 191                         error = this->on_start_multitrack( this, ( mlt_multitrack )object );
 192                         if ( error == 0 )
 193                         {
 194                                 int i = 0;
 195                                 while ( i < mlt_multitrack_count( ( mlt_multitrack )object ) )
 196                                 {
 197                                         this->on_start_track( this );
 198                                         mlt_parser_start( this, ( mlt_service )mlt_multitrack_track( ( mlt_multitrack )object , i ++ ) );
 199                                         this->on_end_track( this );
 200                                 }
 201                                 i = 0;
 202                                 while ( error == 0 && mlt_producer_filter( ( mlt_producer )object, i ) != NULL )
 203                                         error = mlt_parser_start( this, ( mlt_service )mlt_producer_filter( ( mlt_producer )object, i ++ ) );
 204                         }
 205                         error = this->on_end_multitrack( this, ( mlt_multitrack )object );
 206                         break;
 207                 case filter_type:
 208                         error = this->on_start_filter( this, ( mlt_filter )object );
 209                         if ( error == 0 )
 210                         {
 211                                 int i = 0;
 212                                 while ( error == 0 && mlt_producer_filter( ( mlt_producer )object, i ) != NULL )
 213                                         error = mlt_parser_start( this, ( mlt_service )mlt_producer_filter( ( mlt_producer )object, i ++ ) );
 214                         }
 215                         error = this->on_end_filter( this, ( mlt_filter )object );
 216                         break;
 217                 case transition_type:
 218                         error = this->on_start_transition( this, ( mlt_transition )object );
 219                         if ( error == 0 )
 220                         {
 221                                 int i = 0;
 222                                 while ( error == 0 && mlt_producer_filter( ( mlt_producer )object, i ) != NULL )
 223                                         error = mlt_parser_start( this, ( mlt_service )mlt_producer_filter( ( mlt_producer )object, i ++ ) );
 224                         }
 225                         error = this->on_end_transition( this, ( mlt_transition )object );
 226                         break;
 227                 case field_type:
 228                         break;
 229                 case consumer_type:
 230                         break;
 231         }
 232         return error;
 233 }
 234
 235 void mlt_parser_close( mlt_parser this )
 236 {
 237         if ( this != NULL )
 238         {
 239                 mlt_properties_close( &this->parent );
 240                 free( this );
 241         }
 242 }
 243
 244