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 "mlt.h"
  22 #include <stdlib.h>
  23
  24 static int on_invalid( mlt_parser this, mlt_service object )
  25 {
  26         return 0;
  27 }
  28
  29 static int on_unknown( mlt_parser this, mlt_service object )
  30 {
  31         return 0;
  32 }
  33
  34 static int on_start_producer( mlt_parser this, mlt_producer object )
  35 {
  36         return 0;
  37 }
  38
  39 static int on_end_producer( mlt_parser this, mlt_producer object )
  40 {
  41         return 0;
  42 }
  43
  44 static int on_start_playlist( mlt_parser this, mlt_playlist object )
  45 {
  46         return 0;
  47 }
  48
  49 static int on_end_playlist( mlt_parser this, mlt_playlist object )
  50 {
  51         return 0;
  52 }
  53
  54 static int on_start_tractor( mlt_parser this, mlt_tractor object )
  55 {
  56         return 0;
  57 }
  58
  59 static int on_end_tractor( mlt_parser this, mlt_tractor object )
  60 {
  61         return 0;
  62 }
  63
  64 static int on_start_multitrack( mlt_parser this, mlt_multitrack object )
  65 {
  66         return 0;
  67 }
  68
  69 static int on_end_multitrack( mlt_parser this, mlt_multitrack object )
  70 {
  71         return 0;
  72 }
  73
  74 static int on_start_track( mlt_parser this )
  75 {
  76         return 0;
  77 }
  78
  79 static int on_end_track( mlt_parser this )
  80 {
  81         return 0;
  82 }
  83
  84 static int on_start_filter( mlt_parser this, mlt_filter object )
  85 {
  86         return 0;
  87 }
  88
  89 static int on_end_filter( mlt_parser this, mlt_filter object )
  90 {
  91         return 0;
  92 }
  93
  94 static int on_start_transition( mlt_parser this, mlt_transition object )
  95 {
  96         return 0;
  97 }
  98
  99 static int on_end_transition( mlt_parser this, mlt_transition object )
 100 {
 101         return 0;
 102 }
 103
 104 mlt_parser mlt_parser_new( )
 105 {
 106         mlt_parser this = calloc( 1, sizeof( struct mlt_parser_s ) );
 107         if ( this != NULL && mlt_properties_init( &this->parent, this ) == 0 )
 108         {
 109                 this->on_invalid = on_invalid;
 110                 this->on_unknown = on_unknown;
 111                 this->on_start_producer = on_start_producer;
 112                 this->on_end_producer = on_end_producer;
 113                 this->on_start_playlist = on_start_playlist;
 114                 this->on_end_playlist = on_end_playlist;
 115                 this->on_start_tractor = on_start_tractor;
 116                 this->on_end_tractor = on_end_tractor;
 117                 this->on_start_multitrack = on_start_multitrack;
 118                 this->on_end_multitrack = on_end_multitrack;
 119                 this->on_start_track = on_start_track;
 120                 this->on_end_track = on_end_track;
 121                 this->on_start_filter = on_start_filter;
 122                 this->on_end_filter = on_end_filter;
 123                 this->on_start_transition = on_start_transition;
 124                 this->on_end_transition = on_end_transition;
 125         }
 126         return this;
 127 }
 128
 129 mlt_properties mlt_parser_properties( mlt_parser this )
 130 {
 131         return &this->parent;
 132 }
 133
 134 int mlt_parser_start( mlt_parser this, mlt_service object )
 135 {
 136         int error = 0;
 137         mlt_service_type type = mlt_service_identify( object );
 138         switch( type )
 139         {
 140                 case invalid_type:
 141                         error = this->on_invalid( this, object );
 142                         break;
 143                 case unknown_type:
 144                         error = this->on_unknown( this, object );
 145                         break;
 146                 case producer_type:
 147                         if ( mlt_producer_is_cut( ( mlt_producer )object ) )
 148                                 error = mlt_parser_start( this, ( mlt_service )mlt_producer_cut_parent( ( mlt_producer )object ) );
 149                         error = this->on_start_producer( this, ( mlt_producer )object );
 150                         if ( error == 0 )
 151                         {
 152                                 int i = 0;
 153                                 while ( error == 0 && mlt_producer_filter( ( mlt_producer )object, i ) != NULL )
 154                                         error = mlt_parser_start( this, ( mlt_service )mlt_producer_filter( ( mlt_producer )object, i ++ ) );
 155                         }
 156                         error = this->on_end_producer( this, ( mlt_producer )object );
 157                         break;
 158                 case playlist_type:
 159                         error = this->on_start_playlist( this, ( mlt_playlist )object );
 160                         if ( error == 0 )
 161                         {
 162                                 int i = 0;
 163                                 while ( error == 0 && i < mlt_playlist_count( ( mlt_playlist )object ) )
 164                                         mlt_parser_start( this, ( mlt_service )mlt_playlist_get_clip( ( mlt_playlist )object, i ++ ) );
 165                                 i = 0;
 166                                 while ( error == 0 && mlt_producer_filter( ( mlt_producer )object, i ) != NULL )
 167                                         error = mlt_parser_start( this, ( mlt_service )mlt_producer_filter( ( mlt_producer )object, i ++ ) );
 168                         }
 169                         error = this->on_end_playlist( this, ( mlt_playlist )object );
 170                         break;
 171                 case tractor_type:
 172                         error = this->on_start_tractor( this, ( mlt_tractor )object );
 173                         if ( error == 0 )
 174                         {
 175                                 int i = 0;
 176                                 mlt_service next = mlt_service_producer( object );
 177                                 mlt_parser_start( this, ( mlt_service )mlt_tractor_multitrack( ( mlt_tractor )object ) );
 178                                 while ( next != ( mlt_service )mlt_tractor_multitrack( ( mlt_tractor )object ) )
 179                                 {
 180                                         mlt_parser_start( this, next );
 181                                         next = mlt_service_producer( next );
 182                                 }
 183                                 while ( error == 0 && mlt_producer_filter( ( mlt_producer )object, i ) != NULL )
 184                                         error = mlt_parser_start( this, ( mlt_service )mlt_producer_filter( ( mlt_producer )object, i ++ ) );
 185                         }
 186                         error = this->on_end_tractor( this, ( mlt_tractor )object );
 187                         break;
 188                 case multitrack_type:
 189                         error = this->on_start_multitrack( this, ( mlt_multitrack )object );
 190                         if ( error == 0 )
 191                         {
 192                                 int i = 0;
 193                                 while ( i < mlt_multitrack_count( ( mlt_multitrack )object ) )
 194                                 {
 195                                         this->on_start_track( this );
 196                                         mlt_parser_start( this, ( mlt_service )mlt_multitrack_track( ( mlt_multitrack )object , i ++ ) );
 197                                         this->on_end_track( this );
 198                                 }
 199                                 i = 0;
 200                                 while ( error == 0 && mlt_producer_filter( ( mlt_producer )object, i ) != NULL )
 201                                         error = mlt_parser_start( this, ( mlt_service )mlt_producer_filter( ( mlt_producer )object, i ++ ) );
 202                         }
 203                         error = this->on_end_multitrack( this, ( mlt_multitrack )object );
 204                         break;
 205                 case filter_type:
 206                         error = this->on_start_filter( this, ( mlt_filter )object );
 207                         if ( error == 0 )
 208                         {
 209                                 int i = 0;
 210                                 while ( error == 0 && mlt_producer_filter( ( mlt_producer )object, i ) != NULL )
 211                                         error = mlt_parser_start( this, ( mlt_service )mlt_producer_filter( ( mlt_producer )object, i ++ ) );
 212                         }
 213                         error = this->on_end_filter( this, ( mlt_filter )object );
 214                         break;
 215                 case transition_type:
 216                         error = this->on_start_transition( this, ( mlt_transition )object );
 217                         if ( error == 0 )
 218                         {
 219                                 int i = 0;
 220                                 while ( error == 0 && mlt_producer_filter( ( mlt_producer )object, i ) != NULL )
 221                                         error = mlt_parser_start( this, ( mlt_service )mlt_producer_filter( ( mlt_producer )object, i ++ ) );
 222                         }
 223                         error = this->on_end_transition( this, ( mlt_transition )object );
 224                         break;
 225                 case field_type:
 226                         break;
 227                 case consumer_type:
 228                         break;
 229         }
 230         return error;
 231 }
 232
 233 void mlt_parser_close( mlt_parser this )
 234 {
 235         if ( this != NULL )
 236         {
 237                 mlt_properties_close( &this->parent );
 238                 free( this );
 239         }
 240 }
 241
 242