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

   1 /*
   2  * mlt_property.c -- property 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
  23 #include "mlt_property.h"
  24
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 /** Construct and uninitialised property.
  30 */
  31
  32 mlt_property mlt_property_init( )
  33 {
  34         return calloc( sizeof( struct mlt_property_s ), 1 );
  35 }
  36
  37 /** Clear a property.
  38 */
  39
  40 void mlt_property_clear( mlt_property this )
  41 {
  42         // Special case data handling
  43         if ( this->types & mlt_prop_data && this->destructor != NULL )
  44                 this->destructor( this->data );
  45
  46         // Special case string handling
  47         if ( this->types & mlt_prop_string )
  48                 free( this->prop_string );
  49
  50         // We can wipe it now.
  51         memset( this, 0, sizeof( struct mlt_property_s ) );
  52 }
  53
  54 /** Set an int on this property.
  55 */
  56
  57 int mlt_property_set_int( mlt_property this, int value )
  58 {
  59         mlt_property_clear( this );
  60         this->types = mlt_prop_int;
  61         this->prop_int = value;
  62         return 0;
  63 }
  64
  65 /** Set a double on this property.
  66 */
  67
  68 int mlt_property_set_double( mlt_property this, double value )
  69 {
  70         mlt_property_clear( this );
  71         this->types = mlt_prop_double;
  72         this->prop_double = value;
  73         return 0;
  74 }
  75
  76 /** Set a timecode on this property.
  77 */
  78
  79 int mlt_property_set_timecode( mlt_property this, mlt_timecode value )
  80 {
  81         mlt_property_clear( this );
  82         this->types = mlt_prop_timecode;
  83         this->prop_timecode = value;
  84         return 0;
  85 }
  86
  87 /** Set a string on this property.
  88 */
  89
  90 int mlt_property_set_string( mlt_property this, char *value )
  91 {
  92         mlt_property_clear( this );
  93         this->types = mlt_prop_string;
  94         if ( value != NULL )
  95                 this->prop_string = strdup( value );
  96         return this->prop_string != NULL;
  97 }
  98
  99 /** Set a data on this property.
 100 */
 101
 102 int mlt_property_set_data( mlt_property this, void *value, int length, mlt_destructor destructor, mlt_serialiser serialiser )
 103 {
 104         if ( this->data == value )
 105                 this->destructor = NULL;
 106         mlt_property_clear( this );
 107         this->types = mlt_prop_data;
 108         this->data = value;
 109         this->length = length;
 110         this->destructor = destructor;
 111         this->serialiser = serialiser;
 112         return 0;
 113 }
 114
 115 /** Get an int from this property.
 116 */
 117
 118 int mlt_property_get_int( mlt_property this )
 119 {
 120         if ( this->types & mlt_prop_int )
 121                 return this->prop_int;
 122         else if ( this->types & mlt_prop_double )
 123                 return ( int )this->prop_double;
 124         else if ( this->types & mlt_prop_timecode )
 125                 return ( int )this->prop_timecode;
 126         else if ( this->types & mlt_prop_string )
 127                 return atoi( this->prop_string );
 128         return 0;
 129 }
 130
 131 /** Get a double from this property.
 132 */
 133
 134 double mlt_property_get_double( mlt_property this )
 135 {
 136         if ( this->types & mlt_prop_double )
 137                 return this->prop_double;
 138         else if ( this->types & mlt_prop_int )
 139                 return ( double )this->prop_int;
 140         else if ( this->types & mlt_prop_timecode )
 141                 return ( double )this->prop_timecode;
 142         else if ( this->types & mlt_prop_string )
 143                 return atof( this->prop_string );
 144         return 0;
 145 }
 146
 147 /** Get a timecode from this property.
 148 */
 149
 150 mlt_timecode mlt_property_get_timecode( mlt_property this )
 151 {
 152         if ( this->types & mlt_prop_timecode )
 153                 return this->prop_timecode;
 154         else if ( this->types & mlt_prop_int )
 155                 return ( mlt_timecode )this->prop_int;
 156         else if ( this->types & mlt_prop_double )
 157                 return ( mlt_timecode )this->prop_double;
 158         else if ( this->types & mlt_prop_string )
 159                 return ( mlt_timecode )atof( this->prop_string );
 160         return 0;
 161 }
 162
 163 /** Get a string from this property.
 164 */
 165
 166 char *mlt_property_get_string( mlt_property this )
 167 {
 168         // Construct a string if need be
 169         if ( ! ( this->types & mlt_prop_string ) )
 170         {
 171                 if ( this->types & mlt_prop_int )
 172                 {
 173                         this->types |= mlt_prop_string;
 174                         this->prop_string = malloc( 32 );
 175                         sprintf( this->prop_string, "%d", this->prop_int );
 176                 }
 177                 else if ( this->types & mlt_prop_double )
 178                 {
 179                         this->types |= mlt_prop_string;
 180                         this->prop_string = malloc( 32 );
 181                         sprintf( this->prop_string, "%e", this->prop_double );
 182                 }
 183                 else if ( this->types & mlt_prop_timecode )
 184                 {
 185                         this->types |= mlt_prop_string;
 186                         this->prop_string = malloc( 32 );
 187                         sprintf( this->prop_string, "%e", this->prop_timecode );
 188                 }
 189                 else if ( this->types & mlt_prop_data && this->serialiser != NULL )
 190                 {
 191                         this->types |= mlt_prop_string;
 192                         this->prop_string = this->serialiser( this->data, this->length );
 193                 }
 194         }
 195
 196         // Return the string (may be NULL)
 197         return this->prop_string;
 198 }
 199
 200 /** Get a data and associated length.
 201 */
 202
 203 void *mlt_property_get_data( mlt_property this, int *length )
 204 {
 205         // Assign length if not NULL
 206         if ( length != NULL )
 207                 *length = this->length;
 208
 209         // Return the data (note: there is no conversion here)
 210         return this->data;
 211 }
 212
 213 /** Close this property.
 214 */
 215
 216 void mlt_property_close( mlt_property this )
 217 {
 218         mlt_property_clear( this );
 219         free( this );
 220 }
 221
 222