research.m1stereo.tv/gitweb/ - melted/blob - src/modules/core/filter_data_show.c

   1 /*
   2  * filter_data_show.c -- data feed filter
   3  * Copyright (C) 2004-2005 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 "filter_data.h"
  22 #include <framework/mlt.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25
  26 /** Handle the profile.
  27 */
  28
  29 static mlt_filter obtain_filter( mlt_filter filter, char *type )
  30 {
  31         // Result to return
  32         mlt_filter result = NULL;
  33
  34         // Miscelaneous variable
  35         int i = 0;
  36         int type_len = strlen( type );
  37
  38         // Get the properties of the data show filter
  39         mlt_properties filter_properties = MLT_FILTER_PROPERTIES( filter );
  40
  41         // Get the profile properties
  42         mlt_properties profile_properties = mlt_properties_get_data( filter_properties, "profile_properties", NULL );
  43
  44         // Obtain the profile_properties if we haven't already
  45         if ( profile_properties == NULL )
  46         {
  47                 char temp[ 512 ];
  48
  49                 // Get the profile requested
  50                 char *profile = mlt_properties_get( filter_properties, "resource" );
  51
  52                 // If none is specified, pick up the default for this normalisation
  53                 if ( profile == NULL )
  54                         sprintf( temp, "%s/feeds/%s/data_fx.properties", mlt_factory_prefix( ), mlt_environment( "MLT_NORMALISATION" ) );
  55                 else if ( strchr( profile, '%' ) )
  56                         sprintf( temp, "%s/feeds/%s/%s", mlt_factory_prefix( ), mlt_environment( "MLT_NORMALISATION" ), strchr( profile, '%' ) + 1 );
  57                 else
  58                         strcpy( temp, profile );
  59
  60                 // Load the specified profile or use the default
  61                 profile_properties = mlt_properties_load( temp );
  62
  63                 // Store for later retrieval
  64                 mlt_properties_set_data( filter_properties, "profile_properties", profile_properties, 0, ( mlt_destructor )mlt_properties_close, NULL );
  65         }
  66
  67         if ( profile_properties != NULL )
  68         {
  69                 for ( i = 0; i < mlt_properties_count( profile_properties ); i ++ )
  70                 {
  71                         char *name = mlt_properties_get_name( profile_properties, i );
  72                         char *value = mlt_properties_get_value( profile_properties, i );
  73
  74                         if ( result == NULL && !strcmp( name, type ) && result == NULL )
  75                                 result = mlt_factory_filter( value, NULL );
  76                         else if ( result != NULL && !strncmp( name, type, type_len ) && name[ type_len ] == '.' )
  77                                 mlt_properties_set( MLT_FILTER_PROPERTIES( result ), name + type_len + 1, value );
  78                         else if ( result != NULL )
  79                                 break;
  80                 }
  81         }
  82
  83         return result;
  84 }
  85
  86 /** Process the frame for the requested type
  87 */
  88
  89 static int process_feed( mlt_properties feed, mlt_filter filter, mlt_frame frame )
  90 {
  91         // Error return
  92         int error = 1;
  93
  94         // Get the properties of the data show filter
  95         mlt_properties filter_properties = MLT_FILTER_PROPERTIES( filter );
  96
  97         // Get the type requested by the feeding filter
  98         char *type = mlt_properties_get( feed, "type" );
  99
 100         // Fetch the filter associated to this type
 101         mlt_filter requested = mlt_properties_get_data( filter_properties, type, NULL );
 102
 103         // Calculate the length of the feed
 104         int length = mlt_properties_get_int( feed, "out" ) - mlt_properties_get_int( feed, "in" ) + 1;
 105
 106         // If it doesn't exist, then create it now
 107         if ( requested == NULL )
 108         {
 109                 // Source filter from profile
 110                 requested = obtain_filter( filter, type );
 111
 112                 // Store it on the properties for subsequent retrieval/destruction
 113                 mlt_properties_set_data( filter_properties, type, requested, 0, ( mlt_destructor )mlt_filter_close, NULL );
 114         }
 115
 116         // If we have one, then process it now...
 117         if ( requested != NULL )
 118         {
 119                 int i = 0;
 120                 mlt_properties properties = MLT_FILTER_PROPERTIES( requested );
 121                 static char *prefix = "properties.";
 122                 int len = strlen( prefix );
 123
 124                 // Pass properties from feed into requested
 125                 for ( i = 0; i < mlt_properties_count( properties ); i ++ )
 126                 {
 127                         char *name = mlt_properties_get_name( properties, i );
 128                         char *key = mlt_properties_get_value( properties, i );
 129                         if ( !strncmp( name, prefix, len ) )
 130                         {
 131                                 if ( !strncmp( name + len, "length[", 7 ) )
 132                                 {
 133                                         int period = mlt_properties_get_int( properties, "period" );
 134                                         period = period == 0 ? 1 : period;
 135                                         mlt_properties_set_position( properties, key, length / period );
 136                                 }
 137                                 else
 138                                 {
 139                                         char *value = mlt_properties_get( feed, name + len );
 140                                         if ( value != NULL )
 141                                                 mlt_properties_set( properties, key, value );
 142                                 }
 143                         }
 144                 }
 145
 146                 // Set the original position on the frame
 147                 mlt_frame_set_position( frame, mlt_properties_get_int( feed, "position" ) - mlt_properties_get_int( feed, "in" ) );
 148
 149                 // Process the filter
 150                 mlt_filter_process( requested, frame );
 151
 152                 // Should be ok...
 153                 error = 0;
 154         }
 155
 156         return error;
 157 }
 158
 159 /** Get the image.
 160 */
 161
 162 static int filter_get_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
 163 {
 164         // Pop the service
 165         mlt_filter filter = mlt_frame_pop_service( frame );
 166
 167         // Get the frame properties
 168         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
 169
 170         // Fetch the data queue
 171         mlt_deque data_queue = mlt_properties_get_data( frame_properties, "data_queue", NULL );
 172
 173         // Create a new queue for those that we can't handle
 174         mlt_deque temp_queue = mlt_deque_init( );
 175
 176         // Iterate through each entry on the queue
 177         while ( data_queue != NULL && mlt_deque_peek_front( data_queue ) != NULL )
 178         {
 179                 // Get the data feed
 180                 mlt_properties feed = mlt_deque_pop_front( data_queue );
 181
 182                 // Process the data feed...
 183                 if ( process_feed( feed, filter, frame ) == 0 )
 184                         mlt_properties_close( feed );
 185                 else
 186                         mlt_deque_push_back( temp_queue, feed );
 187         }
 188
 189         // Now put the unprocessed feeds back on the stack
 190         while ( data_queue != NULL && mlt_deque_peek_front( temp_queue ) )
 191         {
 192                 // Get the data feed
 193                 mlt_properties feed = mlt_deque_pop_front( temp_queue );
 194
 195                 // Put it back on the data queue
 196                 mlt_deque_push_back( data_queue, feed );
 197         }
 198
 199         // Close the temporary queue
 200         mlt_deque_close( temp_queue );
 201
 202         // Need to get the image
 203         return mlt_frame_get_image( frame, image, format, width, height, 1 );
 204 }
 205
 206
 207 /** Filter processing.
 208 */
 209
 210 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 211 {
 212         // Push the filter
 213         mlt_frame_push_service( frame, this );
 214
 215         // Register the get image method
 216         mlt_frame_push_get_image( frame, filter_get_image );
 217
 218         // Return the frame
 219         return frame;
 220 }
 221
 222 /** Constructor for the filter.
 223 */
 224
 225 mlt_filter filter_data_show_init( char *arg )
 226 {
 227         // Create the filter
 228         mlt_filter this = mlt_filter_new( );
 229
 230         // Initialise it
 231         if ( this != NULL )
 232         {
 233                 // Get the properties
 234                 mlt_properties properties = MLT_FILTER_PROPERTIES( this );
 235
 236                 // Assign the argument (default to titles)
 237                 mlt_properties_set( properties, "resource", arg == NULL ? NULL : arg );
 238
 239                 // Specify the processing method
 240                 this->process = filter_process;
 241         }
 242
 243         return this;
 244 }
 245