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

   1 /*
   2  * mlt_parser.c -- service parsing functionality
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22 #include "mlt.h"
  23 #include <stdlib.h>
  24
  25 static int on_invalid( mlt_parser this, mlt_service object )
  26 {
  27         return 0;
  28 }
  29
  30 static int on_unknown( mlt_parser this, mlt_service object )
  31 {
  32         return 0;
  33 }
  34
  35 static int on_start_producer( mlt_parser this, mlt_producer object )
  36 {
  37         return 0;
  38 }
  39
  40 static int on_end_producer( mlt_parser this, mlt_producer object )
  41 {
  42         return 0;
  43 }
  44
  45 static int on_start_playlist( mlt_parser this, mlt_playlist object )
  46 {
  47         return 0;
  48 }
  49
  50 static int on_end_playlist( mlt_parser this, mlt_playlist object )
  51 {
  52         return 0;
  53 }
  54
  55 static int on_start_tractor( mlt_parser this, mlt_tractor object )
  56 {
  57         return 0;
  58 }
  59
  60 static int on_end_tractor( mlt_parser this, mlt_tractor object )
  61 {
  62         return 0;
  63 }
  64
  65 static int on_start_multitrack( mlt_parser this, mlt_multitrack object )
  66 {
  67         return 0;
  68 }
  69
  70 static int on_end_multitrack( mlt_parser this, mlt_multitrack object )
  71 {
  72         return 0;
  73 }
  74
  75 static int on_start_track( mlt_parser this )
  76 {
  77         return 0;
  78 }
  79
  80 static int on_end_track( mlt_parser this )
  81 {
  82         return 0;
  83 }
  84
  85 static int on_start_filter( mlt_parser this, mlt_filter object )
  86 {
  87         return 0;
  88 }
  89
  90 static int on_end_filter( mlt_parser this, mlt_filter object )
  91 {
  92         return 0;
  93 }
  94
  95 static int on_start_transition( mlt_parser this, mlt_transition object )
  96 {
  97         return 0;
  98 }
  99
 100 static int on_end_transition( mlt_parser this, mlt_transition object )
 101 {
 102         return 0;
 103 }
 104
 105 mlt_parser mlt_parser_new( )
 106 {
 107         mlt_parser this = calloc( 1, sizeof( struct mlt_parser_s ) );
 108         if ( this != NULL && mlt_properties_init( &this->parent, this ) == 0 )
 109         {
 110                 this->on_invalid = on_invalid;
 111                 this->on_unknown = on_unknown;
 112                 this->on_start_producer = on_start_producer;
 113                 this->on_end_producer = on_end_producer;
 114                 this->on_start_playlist = on_start_playlist;
 115                 this->on_end_playlist = on_end_playlist;
 116                 this->on_start_tractor = on_start_tractor;
 117                 this->on_end_tractor = on_end_tractor;
 118                 this->on_start_multitrack = on_start_multitrack;
 119                 this->on_end_multitrack = on_end_multitrack;
 120                 this->on_start_track = on_start_track;
 121                 this->on_end_track = on_end_track;
 122                 this->on_start_filter = on_start_filter;
 123                 this->on_end_filter = on_end_filter;
 124                 this->on_start_transition = on_start_transition;
 125                 this->on_end_transition = on_end_transition;
 126         }
 127         return this;
 128 }
 129
 130 mlt_properties mlt_parser_properties( mlt_parser this )
 131 {
 132         return &this->parent;
 133 }
 134
 135 int mlt_parser_start( mlt_parser this, mlt_service object )
 136 {
 137         int error = 0;
 138         mlt_service_type type = mlt_service_identify( object );
 139         switch( type )
 140         {
 141                 case invalid_type:
 142                         error = this->on_invalid( this, object );
 143                         break;
 144                 case unknown_type:
 145                         error = this->on_unknown( this, object );
 146                         break;
 147                 case producer_type:
 148                         if ( mlt_producer_is_cut( ( mlt_producer )object ) )
 149                                 error = mlt_parser_start( this, ( mlt_service )mlt_producer_cut_parent( ( mlt_producer )object ) );
 150                         error = this->on_start_producer( this, ( mlt_producer )object );
 151                         if ( error == 0 )
 152                         {
 153                                 int i = 0;
 154                                 while ( error == 0 && mlt_producer_filter( ( mlt_producer )object, i ) != NULL )
 155                                         error = mlt_parser_start( this, ( mlt_service )mlt_producer_filter( ( mlt_producer )object, i ++ ) );
 156                         }
 157                         error = this->on_end_producer( this, ( mlt_producer )object );
 158                         break;
 159                 case playlist_type:
 160                         error = this->on_start_playlist( this, ( mlt_playlist )object );
 161                         if ( error == 0 )
 162                         {
 163                                 int i = 0;
 164                                 while ( error == 0 && i < mlt_playlist_count( ( mlt_playlist )object ) )
 165                                         mlt_parser_start( this, ( mlt_service )mlt_playlist_get_clip( ( mlt_playlist )object, i ++ ) );
 166                                 i = 0;
 167                                 while ( error == 0 && mlt_producer_filter( ( mlt_producer )object, i ) != NULL )
 168                                         error = mlt_parser_start( this, ( mlt_service )mlt_producer_filter( ( mlt_producer )object, i ++ ) );
 169                         }
 170                         error = this->on_end_playlist( this, ( mlt_playlist )object );
 171                         break;
 172                 case tractor_type:
 173                         error = this->on_start_tractor( this, ( mlt_tractor )object );
 174                         if ( error == 0 )
 175                         {
 176                                 int i = 0;
 177                                 mlt_service next = mlt_service_producer( object );
 178                                 mlt_parser_start( this, ( mlt_service )mlt_tractor_multitrack( ( mlt_tractor )object ) );
 179                                 while ( next != ( mlt_service )mlt_tractor_multitrack( ( mlt_tractor )object ) )
 180                                 {
 181                                         mlt_parser_start( this, next );
 182                                         next = mlt_service_producer( next );
 183                                 }
 184                                 while ( error == 0 && mlt_producer_filter( ( mlt_producer )object, i ) != NULL )
 185                                         error = mlt_parser_start( this, ( mlt_service )mlt_producer_filter( ( mlt_producer )object, i ++ ) );
 186                         }
 187                         error = this->on_end_tractor( this, ( mlt_tractor )object );
 188                         break;
 189                 case multitrack_type:
 190                         error = this->on_start_multitrack( this, ( mlt_multitrack )object );
 191                         if ( error == 0 )
 192                         {
 193                                 int i = 0;
 194                                 while ( i < mlt_multitrack_count( ( mlt_multitrack )object ) )
 195                                 {
 196                                         this->on_start_track( this );
 197                                         mlt_parser_start( this, ( mlt_service )mlt_multitrack_track( ( mlt_multitrack )object , i ++ ) );
 198                                         this->on_end_track( this );
 199                                 }
 200                                 i = 0;
 201                                 while ( error == 0 && mlt_producer_filter( ( mlt_producer )object, i ) != NULL )
 202                                         error = mlt_parser_start( this, ( mlt_service )mlt_producer_filter( ( mlt_producer )object, i ++ ) );
 203                         }
 204                         error = this->on_end_multitrack( this, ( mlt_multitrack )object );
 205                         break;
 206                 case filter_type:
 207                         error = this->on_start_filter( this, ( mlt_filter )object );
 208                         if ( error == 0 )
 209                         {
 210                                 int i = 0;
 211                                 while ( error == 0 && mlt_producer_filter( ( mlt_producer )object, i ) != NULL )
 212                                         error = mlt_parser_start( this, ( mlt_service )mlt_producer_filter( ( mlt_producer )object, i ++ ) );
 213                         }
 214                         error = this->on_end_filter( this, ( mlt_filter )object );
 215                         break;
 216                 case transition_type:
 217                         error = this->on_start_transition( this, ( mlt_transition )object );
 218                         if ( error == 0 )
 219                         {
 220                                 int i = 0;
 221                                 while ( error == 0 && mlt_producer_filter( ( mlt_producer )object, i ) != NULL )
 222                                         error = mlt_parser_start( this, ( mlt_service )mlt_producer_filter( ( mlt_producer )object, i ++ ) );
 223                         }
 224                         error = this->on_end_transition( this, ( mlt_transition )object );
 225                         break;
 226                 case field_type:
 227                         break;
 228                 case consumer_type:
 229                         break;
 230         }
 231         return error;
 232 }
 233
 234 void mlt_parser_close( mlt_parser this )
 235 {
 236         if ( this != NULL )
 237         {
 238                 mlt_properties_close( &this->parent );
 239                 free( this );
 240         }
 241 }
 242
 243