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

   1 /*
   2  * mlt_properties.c -- base properties class
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program 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
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include "config.h"
  22 #include "mlt_properties.h"
  23 #include "mlt_property.h"
  24
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 /* ---------------- // Private Implementation // ---------------- */
  30
  31 /** Private implementation of the property list.
  32 */
  33
  34 typedef struct
  35 {
  36         char **name;
  37         mlt_property *value;
  38         int count;
  39         int size;
  40 }
  41 property_list;
  42
  43 /** Basic implementation.
  44 */
  45
  46 int mlt_properties_init( mlt_properties this, void *child )
  47 {
  48         // NULL all methods
  49         memset( this, 0, sizeof( struct mlt_properties_s ) );
  50
  51         // Assign the child of the object
  52         this->child = child;
  53
  54         // Allocate the private structure
  55         this->private = calloc( sizeof( property_list ), 1 );
  56
  57         return this->private == NULL;
  58 }
  59
  60 /** Constructor for stand alone object.
  61 */
  62
  63 mlt_properties mlt_properties_new( )
  64 {
  65         // Construct a standalone properties object
  66         mlt_properties this = calloc( sizeof( struct mlt_properties_s ), 1 );
  67
  68         // Initialise this
  69         mlt_properties_init( this, NULL );
  70
  71         // Return the pointer
  72         return this;
  73 }
  74
  75 /** Special case - when a container (such as fezzik) is protecting another
  76         producer, we need to ensure that properties are passed through to the
  77         real producer.
  78 */
  79
  80 static void mlt_properties_do_mirror( mlt_properties this, char *name )
  81 {
  82         if ( strcmp( name, "in" ) && strcmp( name, "out" ) )
  83         {
  84                 mlt_properties mirror = mlt_properties_get_data( this, "mlt_mirror", NULL );
  85                 if ( mirror != NULL )
  86                 {
  87                         char *value = mlt_properties_get( this, name );
  88                         if ( value != NULL )
  89                                 mlt_properties_set( mirror, name, value );
  90                 }
  91         }
  92 }
  93
  94 /** Allow the specification of a mirror.
  95 */
  96
  97 void mlt_properties_mirror( mlt_properties this, mlt_properties that )
  98 {
  99         mlt_properties_set_data( this, "mlt_mirror", that, 0, NULL, NULL );
 100 }
 101
 102 /** Inherit all serialisable properties from that into this.
 103 */
 104
 105 int mlt_properties_inherit( mlt_properties this, mlt_properties that )
 106 {
 107         int count = mlt_properties_count( that );
 108         while ( count -- )
 109         {
 110                 char *value = mlt_properties_get_value( that, count );
 111                 if ( value != NULL )
 112                 {
 113                         char *name = mlt_properties_get_name( that, count );
 114                         mlt_properties_set( this, name, value );
 115                 }
 116         }
 117         return 0;
 118 }
 119
 120 /** Locate a property by name
 121 */
 122
 123 static mlt_property mlt_properties_find( mlt_properties this, char *name )
 124 {
 125         mlt_property value = NULL;
 126         property_list *list = this->private;
 127         int i = 0;
 128
 129         // Locate the item
 130         for ( i = 0; value == NULL && i < list->count; i ++ )
 131                 if ( !strcmp( list->name[ i ], name ) )
 132                         value = list->value[ i ];
 133
 134         return value;
 135 }
 136
 137 /** Add a new property.
 138 */
 139
 140 static mlt_property mlt_properties_add( mlt_properties this, char *name )
 141 {
 142         property_list *list = this->private;
 143
 144         // Check that we have space and resize if necessary
 145         if ( list->count == list->size )
 146         {
 147                 list->size += 10;
 148                 list->name = realloc( list->name, list->size * sizeof( char * ) );
 149                 list->value = realloc( list->value, list->size * sizeof( mlt_property ) );
 150         }
 151
 152         // Assign name/value pair
 153         list->name[ list->count ] = strdup( name );
 154         list->value[ list->count ] = mlt_property_init( );
 155
 156         // Return and increment count accordingly
 157         return list->value[ list->count ++ ];
 158 }
 159
 160 /** Fetch a property by name - this includes add if not found.
 161 */
 162
 163 static mlt_property mlt_properties_fetch( mlt_properties this, char *name )
 164 {
 165         // Try to find an existing property first
 166         mlt_property property = mlt_properties_find( this, name );
 167
 168         // If it wasn't found, create one
 169         if ( property == NULL )
 170                 property = mlt_properties_add( this, name );
 171
 172         // Return the property
 173         return property;
 174 }
 175
 176 /** Set the property.
 177 */
 178
 179 int mlt_properties_set( mlt_properties this, char *name, char *value )
 180 {
 181         int error = 1;
 182
 183         // Fetch the property to work with
 184         mlt_property property = mlt_properties_fetch( this, name );
 185
 186         // Set it if not NULL
 187         if ( property != NULL )
 188         {
 189                 error = mlt_property_set_string( property, value );
 190                 mlt_properties_do_mirror( this, name );
 191         }
 192
 193         return error;
 194 }
 195
 196 /** Get a string value by name.
 197 */
 198
 199 char *mlt_properties_get( mlt_properties this, char *name )
 200 {
 201         mlt_property value = mlt_properties_find( this, name );
 202         return value == NULL ? NULL : mlt_property_get_string( value );
 203 }
 204
 205 /** Get a name by index.
 206 */
 207
 208 char *mlt_properties_get_name( mlt_properties this, int index )
 209 {
 210         property_list *list = this->private;
 211         if ( index >= 0 && index < list->count )
 212                 return list->name[ index ];
 213         return NULL;
 214 }
 215
 216 /** Get a string value by index.
 217 */
 218
 219 char *mlt_properties_get_value( mlt_properties this, int index )
 220 {
 221         property_list *list = this->private;
 222         if ( index >= 0 && index < list->count )
 223                 return mlt_property_get_string( list->value[ index ] );
 224         return NULL;
 225 }
 226
 227 /** Return the number of items in the list.
 228 */
 229
 230 int mlt_properties_count( mlt_properties this )
 231 {
 232         property_list *list = this->private;
 233         return list->count;
 234 }
 235
 236 /** Set a value by parsing a name=value string
 237 */
 238
 239 int mlt_properties_parse( mlt_properties this, char *namevalue )
 240 {
 241         char *name = strdup( namevalue );
 242         char *value = strdup( namevalue );
 243         int error = 0;
 244
 245         if ( strchr( name, '=' ) )
 246         {
 247                 *( strchr( name, '=' ) ) = '\0';
 248                 strcpy( value, strchr( value, '=' ) + 1 );
 249         }
 250         else
 251         {
 252                 strcpy( value, "" );
 253         }
 254
 255         error = mlt_properties_set( this, name, value );
 256
 257         free( name );
 258         free( value );
 259
 260         return error;
 261 }
 262
 263 /** Get a value associated to the name.
 264 */
 265
 266 int mlt_properties_get_int( mlt_properties this, char *name )
 267 {
 268         mlt_property value = mlt_properties_find( this, name );
 269         return value == NULL ? 0 : mlt_property_get_int( value );
 270 }
 271
 272 /** Set a value associated to the name.
 273 */
 274
 275 int mlt_properties_set_int( mlt_properties this, char *name, int value )
 276 {
 277         int error = 1;
 278
 279         // Fetch the property to work with
 280         mlt_property property = mlt_properties_fetch( this, name );
 281
 282         // Set it if not NULL
 283         if ( property != NULL )
 284         {
 285                 error = mlt_property_set_int( property, value );
 286                 mlt_properties_do_mirror( this, name );
 287         }
 288
 289         return error;
 290 }
 291
 292 /** Get a value associated to the name.
 293 */
 294
 295 double mlt_properties_get_double( mlt_properties this, char *name )
 296 {
 297         mlt_property value = mlt_properties_find( this, name );
 298         return value == NULL ? 0 : mlt_property_get_double( value );
 299 }
 300
 301 /** Set a value associated to the name.
 302 */
 303
 304 int mlt_properties_set_double( mlt_properties this, char *name, double value )
 305 {
 306         int error = 1;
 307
 308         // Fetch the property to work with
 309         mlt_property property = mlt_properties_fetch( this, name );
 310
 311         // Set it if not NULL
 312         if ( property != NULL )
 313         {
 314                 error = mlt_property_set_double( property, value );
 315                 mlt_properties_do_mirror( this, name );
 316         }
 317
 318         return error;
 319 }
 320
 321 /** Get a value associated to the name.
 322 */
 323
 324 mlt_position mlt_properties_get_position( mlt_properties this, char *name )
 325 {
 326         mlt_property value = mlt_properties_find( this, name );
 327         return value == NULL ? 0 : mlt_property_get_position( value );
 328 }
 329
 330 /** Set a value associated to the name.
 331 */
 332
 333 int mlt_properties_set_position( mlt_properties this, char *name, mlt_position value )
 334 {
 335         int error = 1;
 336
 337         // Fetch the property to work with
 338         mlt_property property = mlt_properties_fetch( this, name );
 339
 340         // Set it if not NULL
 341         if ( property != NULL )
 342         {
 343                 error = mlt_property_set_position( property, value );
 344                 mlt_properties_do_mirror( this, name );
 345         }
 346
 347         return error;
 348 }
 349
 350 /** Get a value associated to the name.
 351 */
 352
 353 void *mlt_properties_get_data( mlt_properties this, char *name, int *length )
 354 {
 355         mlt_property value = mlt_properties_find( this, name );
 356         return value == NULL ? NULL : mlt_property_get_data( value, length );
 357 }
 358
 359 /** Set a value associated to the name.
 360 */
 361
 362 int mlt_properties_set_data( mlt_properties this, char *name, void *value, int length, mlt_destructor destroy, mlt_serialiser serialise )
 363 {
 364         int error = 1;
 365
 366         // Fetch the property to work with
 367         mlt_property property = mlt_properties_fetch( this, name );
 368
 369         // Set it if not NULL
 370         if ( property != NULL )
 371                 error = mlt_property_set_data( property, value, length, destroy, serialise );
 372
 373         return error;
 374 }
 375
 376 /** Close the list.
 377 */
 378
 379 void mlt_properties_close( mlt_properties this )
 380 {
 381         property_list *list = this->private;
 382         int index = 0;
 383
 384         // Clean up names and values
 385         for ( index = list->count - 1; index >= 0; index -- )
 386         {
 387                 free( list->name[ index ] );
 388                 mlt_property_close( list->value[ index ] );
 389         }
 390
 391         // Clear up the list
 392         free( list->name );
 393         free( list->value );
 394         free( list );
 395
 396         // Free this now if this has no child
 397         if ( this->child == NULL )
 398                 free( this );
 399 }
 400