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         int hash[ 199 ];
  37         char **name;
  38         mlt_property *value;
  39         int count;
  40         int size;
  41         mlt_properties mirror;
  42 }
  43 property_list;
  44
  45 /** Basic implementation.
  46 */
  47
  48 int mlt_properties_init( mlt_properties this, void *child )
  49 {
  50         // NULL all methods
  51         memset( this, 0, sizeof( struct mlt_properties_s ) );
  52
  53         // Assign the child of the object
  54         this->child = child;
  55
  56         // Allocate the private structure
  57         this->private = calloc( sizeof( property_list ), 1 );
  58
  59         return this->private == NULL;
  60 }
  61
  62 /** Constructor for stand alone object.
  63 */
  64
  65 mlt_properties mlt_properties_new( )
  66 {
  67         // Construct a standalone properties object
  68         mlt_properties this = calloc( sizeof( struct mlt_properties_s ), 1 );
  69
  70         // Initialise this
  71         mlt_properties_init( this, NULL );
  72
  73         // Return the pointer
  74         return this;
  75 }
  76
  77 static inline int generate_hash( char *name )
  78 {
  79         int hash = 0;
  80         int i = 1;
  81         while ( *name )
  82                 hash = ( hash + ( i ++ * ( *name ++ & 31 ) ) ) % 199;
  83         return hash;
  84 }
  85
  86 /** Special case - when a container (such as fezzik) is protecting another
  87         producer, we need to ensure that properties are passed through to the
  88         real producer.
  89 */
  90
  91 static inline void mlt_properties_do_mirror( mlt_properties this, char *name )
  92 {
  93         property_list *list = this->private;
  94         if ( list->mirror != NULL && strcmp( name, "in" ) && strcmp( name, "out" ) )
  95         {
  96                 char *value = mlt_properties_get( this, name );
  97                 if ( value != NULL )
  98                         mlt_properties_set( list->mirror, name, value );
  99         }
 100 }
 101
 102 /** Allow the specification of a mirror.
 103 */
 104
 105 void mlt_properties_mirror( mlt_properties this, mlt_properties that )
 106 {
 107         property_list *list = this->private;
 108         list->mirror = that;
 109 }
 110
 111 /** Inherit all serialisable properties from that into this.
 112 */
 113
 114 int mlt_properties_inherit( mlt_properties this, mlt_properties that )
 115 {
 116         int count = mlt_properties_count( that );
 117         int i = 0;
 118         for ( i = 0; i < count; i ++ )
 119         {
 120                 char *value = mlt_properties_get_value( that, i );
 121                 if ( value != NULL )
 122                 {
 123                         char *name = mlt_properties_get_name( that, i );
 124                         mlt_properties_set( this, name, value );
 125                 }
 126         }
 127         return 0;
 128 }
 129
 130 /** Pass all properties from 'that' that match the prefix to 'this' (excluding the prefix).
 131 */
 132
 133 int mlt_properties_pass( mlt_properties this, mlt_properties that, char *prefix )
 134 {
 135         int count = mlt_properties_count( that );
 136         int length = strlen( prefix );
 137         int i = 0;
 138         for ( i = 0; i < count; i ++ )
 139         {
 140                 char *name = mlt_properties_get_name( that, i );
 141                 if ( !strncmp( name, prefix, length ) )
 142                 {
 143                         char *value = mlt_properties_get_value( that, i );
 144                         if ( value != NULL )
 145                                 mlt_properties_set( this, name + length, value );
 146                 }
 147         }
 148         return 0;
 149 }
 150
 151 /** Locate a property by name
 152 */
 153
 154 static inline mlt_property mlt_properties_find( mlt_properties this, char *name )
 155 {
 156         property_list *list = this->private;
 157         mlt_property value = NULL;
 158         int key = generate_hash( name );
 159         int i = list->hash[ key ] - 1;
 160
 161         if ( i >= 0 )
 162         {
 163                 // Check if we're hashed
 164                 if ( list->count > 0 &&
 165                         name[ 0 ] == list->name[ i ][ 0 ] &&
 166                         !strcmp( list->name[ i ], name ) )
 167                         value = list->value[ i ];
 168
 169                 // Locate the item
 170                 for ( i = list->count - 1; value == NULL && i >= 0; i -- )
 171                         if ( name[ 0 ] == list->name[ i ][ 0 ] && !strcmp( list->name[ i ], name ) )
 172                                 value = list->value[ i ];
 173         }
 174
 175         return value;
 176 }
 177
 178 /** Add a new property.
 179 */
 180
 181 static mlt_property mlt_properties_add( mlt_properties this, char *name )
 182 {
 183         property_list *list = this->private;
 184         int key = generate_hash( name );
 185
 186         // Check that we have space and resize if necessary
 187         if ( list->count == list->size )
 188         {
 189                 list->size += 50;
 190                 list->name = realloc( list->name, list->size * sizeof( char * ) );
 191                 list->value = realloc( list->value, list->size * sizeof( mlt_property ) );
 192         }
 193
 194         // Assign name/value pair
 195         list->name[ list->count ] = strdup( name );
 196         list->value[ list->count ] = mlt_property_init( );
 197
 198         // Assign to hash table
 199         if ( list->hash[ key ] == 0 )
 200                 list->hash[ key ] = list->count + 1;
 201
 202         // Return and increment count accordingly
 203         return list->value[ list->count ++ ];
 204 }
 205
 206 /** Fetch a property by name - this includes add if not found.
 207 */
 208
 209 static mlt_property mlt_properties_fetch( mlt_properties this, char *name )
 210 {
 211         // Try to find an existing property first
 212         mlt_property property = mlt_properties_find( this, name );
 213
 214         // If it wasn't found, create one
 215         if ( property == NULL )
 216                 property = mlt_properties_add( this, name );
 217
 218         // Return the property
 219         return property;
 220 }
 221
 222 /** Set the property.
 223 */
 224
 225 int mlt_properties_set( mlt_properties this, char *name, char *value )
 226 {
 227         int error = 1;
 228
 229         // Fetch the property to work with
 230         mlt_property property = mlt_properties_fetch( this, name );
 231
 232         // Set it if not NULL
 233         if ( property != NULL )
 234         {
 235                 error = mlt_property_set_string( property, value );
 236                 mlt_properties_do_mirror( this, name );
 237         }
 238
 239         return error;
 240 }
 241
 242 /** Get a string value by name.
 243 */
 244
 245 char *mlt_properties_get( mlt_properties this, char *name )
 246 {
 247         mlt_property value = mlt_properties_find( this, name );
 248         return value == NULL ? NULL : mlt_property_get_string( value );
 249 }
 250
 251 /** Get a name by index.
 252 */
 253
 254 char *mlt_properties_get_name( mlt_properties this, int index )
 255 {
 256         property_list *list = this->private;
 257         if ( index >= 0 && index < list->count )
 258                 return list->name[ index ];
 259         return NULL;
 260 }
 261
 262 /** Get a string value by index.
 263 */
 264
 265 char *mlt_properties_get_value( mlt_properties this, int index )
 266 {
 267         property_list *list = this->private;
 268         if ( index >= 0 && index < list->count )
 269                 return mlt_property_get_string( list->value[ index ] );
 270         return NULL;
 271 }
 272
 273 /** Get a data value by index.
 274 */
 275
 276 void *mlt_properties_get_data_at( mlt_properties this, int index, int *size )
 277 {
 278         property_list *list = this->private;
 279         if ( index >= 0 && index < list->count )
 280                 return mlt_property_get_data( list->value[ index ], size );
 281         return NULL;
 282 }
 283
 284 /** Return the number of items in the list.
 285 */
 286
 287 int mlt_properties_count( mlt_properties this )
 288 {
 289         property_list *list = this->private;
 290         return list->count;
 291 }
 292
 293 /** Set a value by parsing a name=value string
 294 */
 295
 296 int mlt_properties_parse( mlt_properties this, char *namevalue )
 297 {
 298         char *name = strdup( namevalue );
 299         char *value = strdup( namevalue );
 300         int error = 0;
 301
 302         if ( strchr( name, '=' ) )
 303         {
 304                 *( strchr( name, '=' ) ) = '\0';
 305                 strcpy( value, strchr( value, '=' ) + 1 );
 306         }
 307         else
 308         {
 309                 strcpy( value, "" );
 310         }
 311
 312         if ( strlen( value ) > 1 && value[ 0 ] == '\"' )
 313         {
 314                 strcpy( value, value + 1 );
 315                 if ( value[ strlen( value ) - 1 ] == '\"' )
 316                         value[ strlen( value ) - 1 ] = '\0';
 317         }
 318
 319         error = mlt_properties_set( this, name, value );
 320
 321         free( name );
 322         free( value );
 323
 324         return error;
 325 }
 326
 327 /** Get a value associated to the name.
 328 */
 329
 330 int mlt_properties_get_int( mlt_properties this, char *name )
 331 {
 332         mlt_property value = mlt_properties_find( this, name );
 333         return value == NULL ? 0 : mlt_property_get_int( value );
 334 }
 335
 336 /** Set a value associated to the name.
 337 */
 338
 339 int mlt_properties_set_int( mlt_properties this, char *name, int value )
 340 {
 341         int error = 1;
 342
 343         // Fetch the property to work with
 344         mlt_property property = mlt_properties_fetch( this, name );
 345
 346         // Set it if not NULL
 347         if ( property != NULL )
 348         {
 349                 error = mlt_property_set_int( property, value );
 350                 mlt_properties_do_mirror( this, name );
 351         }
 352
 353         return error;
 354 }
 355
 356 /** Get a value associated to the name.
 357 */
 358
 359 double mlt_properties_get_double( mlt_properties this, char *name )
 360 {
 361         mlt_property value = mlt_properties_find( this, name );
 362         return value == NULL ? 0 : mlt_property_get_double( value );
 363 }
 364
 365 /** Set a value associated to the name.
 366 */
 367
 368 int mlt_properties_set_double( mlt_properties this, char *name, double value )
 369 {
 370         int error = 1;
 371
 372         // Fetch the property to work with
 373         mlt_property property = mlt_properties_fetch( this, name );
 374
 375         // Set it if not NULL
 376         if ( property != NULL )
 377         {
 378                 error = mlt_property_set_double( property, value );
 379                 mlt_properties_do_mirror( this, name );
 380         }
 381
 382         return error;
 383 }
 384
 385 /** Get a value associated to the name.
 386 */
 387
 388 mlt_position mlt_properties_get_position( mlt_properties this, char *name )
 389 {
 390         mlt_property value = mlt_properties_find( this, name );
 391         return value == NULL ? 0 : mlt_property_get_position( value );
 392 }
 393
 394 /** Set a value associated to the name.
 395 */
 396
 397 int mlt_properties_set_position( mlt_properties this, char *name, mlt_position value )
 398 {
 399         int error = 1;
 400
 401         // Fetch the property to work with
 402         mlt_property property = mlt_properties_fetch( this, name );
 403
 404         // Set it if not NULL
 405         if ( property != NULL )
 406         {
 407                 error = mlt_property_set_position( property, value );
 408                 mlt_properties_do_mirror( this, name );
 409         }
 410
 411         return error;
 412 }
 413
 414 /** Get a value associated to the name.
 415 */
 416
 417 void *mlt_properties_get_data( mlt_properties this, char *name, int *length )
 418 {
 419         mlt_property value = mlt_properties_find( this, name );
 420         return value == NULL ? NULL : mlt_property_get_data( value, length );
 421 }
 422
 423 /** Set a value associated to the name.
 424 */
 425
 426 int mlt_properties_set_data( mlt_properties this, char *name, void *value, int length, mlt_destructor destroy, mlt_serialiser serialise )
 427 {
 428         int error = 1;
 429
 430         // Fetch the property to work with
 431         mlt_property property = mlt_properties_fetch( this, name );
 432
 433         // Set it if not NULL
 434         if ( property != NULL )
 435                 error = mlt_property_set_data( property, value, length, destroy, serialise );
 436
 437         return error;
 438 }
 439
 440 /** Rename a property.
 441 */
 442
 443 int mlt_properties_rename( mlt_properties this, char *source, char *dest )
 444 {
 445         mlt_property value = mlt_properties_find( this, dest );
 446
 447         if ( value == NULL )
 448         {
 449                 property_list *list = this->private;
 450                 int i = 0;
 451
 452                 // Locate the item
 453                 for ( i = 0; i < list->count; i ++ )
 454                 {
 455                         if ( !strcmp( list->name[ i ], source ) )
 456                         {
 457                                 free( list->name[ i ] );
 458                                 list->name[ i ] = strdup( dest );
 459                                 list->hash[ generate_hash( dest ) ] = i + 1;
 460                                 break;
 461                         }
 462                 }
 463         }
 464
 465         return value != NULL;
 466 }
 467
 468 /** Dump the properties.
 469 */
 470
 471 void mlt_properties_dump( mlt_properties this, FILE *output )
 472 {
 473         property_list *list = this->private;
 474         int i = 0;
 475         for ( i = 0; i < list->count; i ++ )
 476                 fprintf( stderr, "%s = %s\n", list->name[ i ], mlt_properties_get( this, list->name[ i ] ) );
 477 }
 478
 479 /** Close the list.
 480 */
 481
 482 void mlt_properties_close( mlt_properties this )
 483 {
 484         property_list *list = this->private;
 485         int index = 0;
 486
 487         // Clean up names and values
 488         for ( index = list->count - 1; index >= 0; index -- )
 489         {
 490                 free( list->name[ index ] );
 491                 mlt_property_close( list->value[ index ] );
 492         }
 493
 494         // Clear up the list
 495         free( list->name );
 496         free( list->value );
 497         free( list );
 498
 499         // Free this now if this has no child
 500         if ( this->child == NULL )
 501                 free( this );
 502 }
 503