git.sesse.net Git - mlt/blob - src/modules/gtk2/producer_pixbuf.c

   1 /*
   2  * producer_pixbuf.c -- raster image loader based upon gdk-pixbuf
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Dan Dennedy <dan@dennedy.org>
   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 <framework/mlt_producer.h>
  22 #include <framework/mlt_frame.h>
  23 #include <framework/mlt_cache.h>
  24 #include <framework/mlt_log.h>
  25 #include <gdk-pixbuf/gdk-pixbuf.h>
  26
  27 #include "config.h"
  28
  29 #ifdef USE_EXIF
  30 #include <libexif/exif-data.h>
  31 #endif
  32
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <string.h>
  36 #include <pthread.h>
  37 #include <math.h>
  38 #include <sys/types.h>
  39 #include <sys/stat.h>
  40 #include <unistd.h>
  41 #include <dirent.h>
  42 #include <ctype.h>
  43
  44 // this protects concurrent access to gdk_pixbuf
  45 static pthread_mutex_t g_mutex = PTHREAD_MUTEX_INITIALIZER;
  46
  47 typedef struct producer_pixbuf_s *producer_pixbuf;
  48
  49 struct producer_pixbuf_s
  50 {
  51         struct mlt_producer_s parent;
  52
  53         // File name list
  54         mlt_properties filenames;
  55         int count;
  56         int image_idx;
  57         int pixbuf_idx;
  58         int width;
  59         int height;
  60         uint8_t *alpha;
  61         uint8_t *image;
  62         mlt_cache_item image_cache;
  63         mlt_cache_item alpha_cache;
  64         mlt_cache_item pixbuf_cache;
  65         GdkPixbuf *pixbuf;
  66         mlt_image_format format;
  67 };
  68
  69 static void load_filenames( producer_pixbuf self, mlt_properties producer_properties );
  70 static int refresh_pixbuf( producer_pixbuf self, mlt_frame frame );
  71 static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int index );
  72 static void producer_close( mlt_producer parent );
  73
  74 mlt_producer producer_pixbuf_init( char *filename )
  75 {
  76         producer_pixbuf self = calloc( 1, sizeof( struct producer_pixbuf_s ) );
  77         if ( self != NULL && mlt_producer_init( &self->parent, self ) == 0 )
  78         {
  79                 mlt_producer producer = &self->parent;
  80
  81                 // Get the properties interface
  82                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( &self->parent );
  83
  84                 // Callback registration
  85                 producer->get_frame = producer_get_frame;
  86                 producer->close = ( mlt_destructor )producer_close;
  87
  88                 // Set the default properties
  89                 mlt_properties_set( properties, "resource", filename );
  90                 mlt_properties_set_int( properties, "ttl", 25 );
  91                 mlt_properties_set_int( properties, "aspect_ratio", 1 );
  92                 mlt_properties_set_int( properties, "progressive", 1 );
  93                 mlt_properties_set_int( properties, "seekable", 1 );
  94
  95                 // Validate the resource
  96                 if ( filename )
  97                         load_filenames( self, properties );
  98                 if ( self->count )
  99                 {
 100                         mlt_frame frame = mlt_frame_init( MLT_PRODUCER_SERVICE( producer ) );
 101                         if ( frame )
 102                         {
 103                                 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
 104                                 mlt_properties_set_data( frame_properties, "producer_pixbuf", self, 0, NULL, NULL );
 105                                 mlt_frame_set_position( frame, mlt_producer_position( producer ) );
 106                                 mlt_properties_set_position( frame_properties, "pixbuf_position", mlt_producer_position( producer ) );
 107                                 refresh_pixbuf( self, frame );
 108                                 mlt_cache_item_close( self->pixbuf_cache );
 109                                 mlt_frame_close( frame );
 110                         }
 111                 }
 112                 if ( self->width == 0 )
 113                 {
 114                         producer_close( producer );
 115                         producer = NULL;
 116                 }
 117                 return producer;
 118         }
 119         free( self );
 120         return NULL;
 121 }
 122
 123 static int load_svg( producer_pixbuf self, mlt_properties properties, const char *filename )
 124 {
 125         int result = 0;
 126
 127         // Read xml string
 128         if ( strstr( filename, "<svg" ) )
 129         {
 130                 // Generate a temporary file for the svg
 131                 char fullname[ 1024 ] = "/tmp/mlt.XXXXXX";
 132                 int fd = g_mkstemp( fullname );
 133
 134                 if ( fd > -1 )
 135                 {
 136                         // Write the svg into the temp file
 137                         ssize_t remaining_bytes;
 138                         const char *xml = filename;
 139
 140                         // Strip leading crap
 141                         while ( xml[0] != '<' )
 142                                 xml++;
 143
 144                         remaining_bytes = strlen( xml );
 145                         while ( remaining_bytes > 0 )
 146                                 remaining_bytes -= write( fd, xml + strlen( xml ) - remaining_bytes, remaining_bytes );
 147                         close( fd );
 148
 149                         mlt_properties_set( self->filenames, "0", fullname );
 150
 151                         // Teehe - when the producer closes, delete the temp file and the space allo
 152                         mlt_properties_set_data( properties, "__temporary_file__", fullname, 0, ( mlt_destructor )unlink, NULL );
 153                         result = 1;
 154                 }
 155         }
 156         return result;
 157 }
 158
 159 static int load_sequence( producer_pixbuf self, mlt_properties properties, const char *filename )
 160 {
 161         int result = 0;
 162
 163         // Obtain filenames with pattern
 164         if ( strchr( filename, '%' ) != NULL )
 165         {
 166                 // handle picture sequences
 167                 int i = mlt_properties_get_int( properties, "begin" );
 168                 int gap = 0;
 169                 char full[1024];
 170                 int keyvalue = 0;
 171                 char key[ 50 ];
 172
 173                 while ( gap < 100 )
 174                 {
 175                         struct stat buf;
 176                         snprintf( full, 1023, filename, i ++ );
 177                         if ( stat( full, &buf ) == 0 )
 178                         {
 179                                 sprintf( key, "%d", keyvalue ++ );
 180                                 mlt_properties_set( self->filenames, key, full );
 181                                 gap = 0;
 182                         }
 183                         else
 184                         {
 185                                 gap ++;
 186                         }
 187                 }
 188                 if ( mlt_properties_count( self->filenames ) > 0 )
 189                 {
 190                         mlt_properties_set_int( properties, "ttl", 1 );
 191                         result = 1;
 192                 }
 193         }
 194         return result;
 195 }
 196
 197 static int load_sequence2( producer_pixbuf self, mlt_properties properties, const char *filename )
 198 {
 199         int result = 0;
 200         const char *start;
 201
 202         // Obtain filenames with pattern containing a begin value, e.g. foo%1234d.png
 203         if ( ( start = strchr( filename, '%' ) ) )
 204         {
 205                 const char *end = ++start;
 206                 while ( isdigit( *end ) ) end++;
 207                 if ( end > start && ( end[0] == 'd' || end[0] == 'i' || end[0] == 'u' ) )
 208                 {
 209                         int n = end - start;
 210                         char *s = calloc( 1, n + 1 );
 211                         strncpy( s, start, n );
 212                         mlt_properties_set( properties, "begin", s );
 213                         free( s );
 214                         s = calloc( 1, strlen( filename ) );
 215                         strncpy( s, filename, start - filename );
 216                         sprintf( s + ( start - filename ), ".%d%s", n, end );
 217                         result = load_sequence( self, properties, s );
 218                         free( s );
 219                 }
 220         }
 221         return result;
 222 }
 223
 224 static int load_folder( producer_pixbuf self, mlt_properties properties, const char *filename )
 225 {
 226         int result = 0;
 227
 228         // Obtain filenames with folder
 229         if ( strstr( filename, "/.all." ) != NULL )
 230         {
 231                 char wildcard[ 1024 ];
 232                 char *dir_name = strdup( filename );
 233                 char *extension = strrchr( dir_name, '.' );
 234
 235                 *( strstr( dir_name, "/.all." ) + 1 ) = '\0';
 236                 sprintf( wildcard, "*%s", extension );
 237
 238                 mlt_properties_dir_list( self->filenames, dir_name, wildcard, 1 );
 239
 240                 free( dir_name );
 241                 result = 1;
 242         }
 243         return result;
 244 }
 245
 246 static void load_filenames( producer_pixbuf self, mlt_properties properties )
 247 {
 248         char *filename = mlt_properties_get( properties, "resource" );
 249         self->filenames = mlt_properties_new( );
 250
 251         if (!load_svg( self, properties, filename ) &&
 252                 !load_sequence( self, properties, filename ) &&
 253                 !load_sequence2( self, properties, filename ) &&
 254                 !load_folder( self, properties, filename ) )
 255         {
 256                 mlt_properties_set( self->filenames, "0", filename );
 257         }
 258         self->count = mlt_properties_count( self->filenames );
 259 }
 260
 261 static GdkPixbuf* reorient_with_exif( producer_pixbuf self, int image_idx, GdkPixbuf *pixbuf )
 262 {
 263 #ifdef USE_EXIF
 264         mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( &self->parent );
 265         ExifData *d = exif_data_new_from_file( mlt_properties_get_value( self->filenames, image_idx ) );
 266         ExifEntry *entry;
 267         int exif_orientation = 0;
 268
 269         /* get orientation and rotate image accordingly if necessary */
 270         if (d)
 271         {
 272                 if ( ( entry = exif_content_get_entry ( d->ifd[EXIF_IFD_0], EXIF_TAG_ORIENTATION ) ) )
 273                         exif_orientation = exif_get_short (entry->data, exif_data_get_byte_order (d));
 274
 275                 /* Free the EXIF data */
 276                 exif_data_unref(d);
 277         }
 278
 279         // Remember EXIF value, might be useful for someone
 280         mlt_properties_set_int( producer_props, "_exif_orientation" , exif_orientation );
 281
 282         if ( exif_orientation > 1 )
 283         {
 284                 GdkPixbuf *processed = NULL;
 285                 GdkPixbufRotation matrix = GDK_PIXBUF_ROTATE_NONE;
 286
 287                 // Rotate image according to exif data
 288                 switch ( exif_orientation ) {
 289                   case 2:
 290                           processed = gdk_pixbuf_flip ( pixbuf, TRUE );
 291                           break;
 292                   case 3:
 293                           matrix = GDK_PIXBUF_ROTATE_UPSIDEDOWN;
 294                           processed = pixbuf;
 295                           break;
 296                   case 4:
 297                           processed = gdk_pixbuf_flip ( pixbuf, FALSE );
 298                           break;
 299                   case 5:
 300                           matrix = GDK_PIXBUF_ROTATE_COUNTERCLOCKWISE;
 301                           processed = gdk_pixbuf_flip ( pixbuf, TRUE );
 302                           break;
 303                   case 6:
 304                           matrix = GDK_PIXBUF_ROTATE_CLOCKWISE;
 305                           processed = pixbuf;
 306                           break;
 307                   case 7:
 308                           matrix = GDK_PIXBUF_ROTATE_CLOCKWISE;
 309                           processed = gdk_pixbuf_flip ( pixbuf, TRUE );
 310                           break;
 311                   case 8:
 312                           matrix = GDK_PIXBUF_ROTATE_COUNTERCLOCKWISE;
 313                           processed = pixbuf;
 314                           break;
 315                 }
 316                 if ( processed )
 317                 {
 318                         pixbuf = gdk_pixbuf_rotate_simple( processed, matrix );
 319                         g_object_unref( processed );
 320                 }
 321         }
 322 #endif
 323         return pixbuf;
 324 }
 325
 326 static int refresh_pixbuf( producer_pixbuf self, mlt_frame frame )
 327 {
 328         // Obtain properties of frame and producer
 329         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
 330         mlt_producer producer = &self->parent;
 331         mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );
 332
 333         // Check if user wants us to reload the image
 334         if ( mlt_properties_get_int( producer_props, "force_reload" ) )
 335         {
 336                 self->pixbuf = NULL;
 337                 self->image = NULL;
 338                 mlt_properties_set_int( producer_props, "force_reload", 0 );
 339         }
 340
 341         // Get the time to live for each frame
 342         double ttl = mlt_properties_get_int( producer_props, "ttl" );
 343
 344         // Get the original position of this frame
 345         mlt_position position = mlt_properties_get_position( properties, "pixbuf_position" );
 346         position += mlt_producer_get_in( producer );
 347
 348         // Image index
 349         int current_idx = ( int )floor( ( double )position / ttl ) % self->count;
 350
 351         // Key for the cache
 352         char image_key[ 10 ];
 353         sprintf( image_key, "%d", current_idx );
 354
 355         int disable_exif = mlt_properties_get_int( producer_props, "disable_exif" );
 356
 357         if ( current_idx != self->pixbuf_idx )
 358                 self->pixbuf = NULL;
 359         if ( !self->pixbuf || mlt_properties_get_int( producer_props, "_disable_exif" ) != disable_exif )
 360         {
 361                 GError *error = NULL;
 362
 363                 self->image = NULL;
 364                 pthread_mutex_lock( &g_mutex );
 365                 self->pixbuf = gdk_pixbuf_new_from_file( mlt_properties_get_value( self->filenames, current_idx ), &error );
 366                 if ( self->pixbuf )
 367                 {
 368                         // Read the exif value for this file
 369                         if ( !disable_exif )
 370                                 self->pixbuf = reorient_with_exif( self, current_idx, self->pixbuf );
 371
 372                         // Register this pixbuf for destruction and reuse
 373                         mlt_cache_item_close( self->pixbuf_cache );
 374                         mlt_service_cache_put( MLT_PRODUCER_SERVICE( producer ), "pixbuf.pixbuf", self->pixbuf, 0, ( mlt_destructor )g_object_unref );
 375                         self->pixbuf_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "pixbuf.pixbuf" );
 376                         self->pixbuf_idx = current_idx;
 377
 378                         // Store the width/height of the pixbuf temporarily
 379                         self->width = gdk_pixbuf_get_width( self->pixbuf );
 380                         self->height = gdk_pixbuf_get_height( self->pixbuf );
 381
 382                         mlt_events_block( producer_props, NULL );
 383                         mlt_properties_set_int( producer_props, "meta.media.width", self->width );
 384                         mlt_properties_set_int( producer_props, "meta.media.height", self->height );
 385                         mlt_properties_set_int( producer_props, "_disable_exif", disable_exif );
 386                         mlt_events_unblock( producer_props, NULL );
 387
 388                 }
 389                 pthread_mutex_unlock( &g_mutex );
 390         }
 391
 392         // Set width/height of frame
 393         mlt_properties_set_int( properties, "width", self->width );
 394         mlt_properties_set_int( properties, "height", self->height );
 395
 396         return current_idx;
 397 }
 398
 399 static void refresh_image( producer_pixbuf self, mlt_frame frame, mlt_image_format format, int width, int height )
 400 {
 401         // Obtain properties of frame and producer
 402         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
 403         mlt_producer producer = &self->parent;
 404
 405         // Get index and pixbuf
 406         int current_idx = refresh_pixbuf( self, frame );
 407
 408         // optimization for subsequent iterations on single picture
 409         if ( current_idx != self->image_idx || width != self->width || height != self->height )
 410                 self->image = NULL;
 411         mlt_log_debug( MLT_PRODUCER_SERVICE( producer ), "image %p pixbuf %p idx %d current_idx %d pixbuf_idx %d width %d\n",
 412                 self->image, self->pixbuf, current_idx, self->image_idx, self->pixbuf_idx, width );
 413
 414         // If we have a pixbuf and we need an image
 415         if ( self->pixbuf && ( !self->image || ( format != mlt_image_none && format != self->format ) ) )
 416         {
 417                 char *interps = mlt_properties_get( properties, "rescale.interp" );
 418                 int interp = GDK_INTERP_BILINEAR;
 419
 420                 if ( strcmp( interps, "nearest" ) == 0 )
 421                         interp = GDK_INTERP_NEAREST;
 422                 else if ( strcmp( interps, "tiles" ) == 0 )
 423                         interp = GDK_INTERP_TILES;
 424                 else if ( strcmp( interps, "hyper" ) == 0 || strcmp( interps, "bicubic" ) == 0 )
 425                         interp = GDK_INTERP_HYPER;
 426
 427                 // Note - the original pixbuf is already safe and ready for destruction
 428                 pthread_mutex_lock( &g_mutex );
 429                 GdkPixbuf* pixbuf = gdk_pixbuf_scale_simple( self->pixbuf, width, height, interp );
 430
 431                 // Store width and height
 432                 self->width = width;
 433                 self->height = height;
 434
 435                 // Allocate/define image
 436                 int has_alpha = gdk_pixbuf_get_has_alpha( pixbuf );
 437                 int src_stride = gdk_pixbuf_get_rowstride( pixbuf );
 438                 int dst_stride = self->width * ( has_alpha ? 4 : 3 );
 439                 int image_size = dst_stride * ( height + 1 );
 440                 self->image = mlt_pool_alloc( image_size );
 441                 self->alpha = NULL;
 442                 self->format = has_alpha ? mlt_image_rgb24a : mlt_image_rgb24;
 443
 444                 if ( src_stride != dst_stride )
 445                 {
 446                         int y = self->height;
 447                         uint8_t *src = gdk_pixbuf_get_pixels( pixbuf );
 448                         uint8_t *dst = self->image;
 449                         while ( y-- )
 450                         {
 451                                 memcpy( dst, src, dst_stride );
 452                                 dst += dst_stride;
 453                                 src += src_stride;
 454                         }
 455                 }
 456                 else
 457                 {
 458                         memcpy( self->image, gdk_pixbuf_get_pixels( pixbuf ), src_stride * height );
 459                 }
 460                 pthread_mutex_unlock( &g_mutex );
 461
 462                 // Convert image to requested format
 463                 if ( format != mlt_image_none && format != self->format )
 464                 {
 465                         uint8_t *buffer = NULL;
 466
 467                         // First, set the image so it can be converted when we get it
 468                         mlt_frame_replace_image( frame, self->image, self->format, width, height );
 469                         mlt_frame_set_image( frame, self->image, image_size, mlt_pool_release );
 470                         self->format = format;
 471
 472                         // get_image will do the format conversion
 473                         mlt_frame_get_image( frame, &buffer, &format, &width, &height, 0 );
 474
 475                         // cache copies of the image and alpha buffers
 476                         if ( buffer )
 477                         {
 478                                 image_size = mlt_image_format_size( format, width, height, NULL );
 479                                 self->image = mlt_pool_alloc( image_size );
 480                                 memcpy( self->image, buffer, image_size );
 481                         }
 482                         if ( ( buffer = mlt_frame_get_alpha_mask( frame ) ) )
 483                         {
 484                                 self->alpha = mlt_pool_alloc( width * height );
 485                                 memcpy( self->alpha, buffer, width * height );
 486                         }
 487                 }
 488
 489                 // Update the cache
 490                 mlt_cache_item_close( self->image_cache );
 491                 mlt_service_cache_put( MLT_PRODUCER_SERVICE( producer ), "pixbuf.image", self->image, image_size, mlt_pool_release );
 492                 self->image_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "pixbuf.image" );
 493                 self->image_idx = current_idx;
 494                 mlt_cache_item_close( self->alpha_cache );
 495                 self->alpha_cache = NULL;
 496                 if ( self->alpha )
 497                 {
 498                         mlt_service_cache_put( MLT_PRODUCER_SERVICE( producer ), "pixbuf.alpha", self->alpha, width * height, mlt_pool_release );
 499                         self->alpha_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "pixbuf.alpha" );
 500                 }
 501
 502                 // Finished with pixbuf now
 503                 g_object_unref( pixbuf );
 504         }
 505
 506         // Set width/height of frame
 507         mlt_properties_set_int( properties, "width", self->width );
 508         mlt_properties_set_int( properties, "height", self->height );
 509 }
 510
 511 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 512 {
 513         int error = 0;
 514
 515         // Obtain properties of frame and producer
 516         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
 517         producer_pixbuf self = mlt_properties_get_data( properties, "producer_pixbuf", NULL );
 518         mlt_producer producer = &self->parent;
 519
 520         // Use the width and height suggested by the rescale filter because we can do our own scaling.
 521         *width = mlt_properties_get_int( properties, "rescale_width" );
 522         *height = mlt_properties_get_int( properties, "rescale_height" );
 523
 524         // Restore pixbuf and image
 525         mlt_service_lock( MLT_PRODUCER_SERVICE( producer ) );
 526         self->pixbuf_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "pixbuf.pixbuf" );
 527         self->pixbuf = mlt_cache_item_data( self->pixbuf_cache, NULL );
 528         self->image_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "pixbuf.image" );
 529         self->image = mlt_cache_item_data( self->image_cache, NULL );
 530         self->alpha_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "pixbuf.alpha" );
 531         self->alpha = mlt_cache_item_data( self->alpha_cache, NULL );
 532
 533         // Refresh the image
 534         refresh_image( self, frame, *format, *width, *height );
 535
 536         // Get width and height (may have changed during the refresh)
 537         *width = self->width;
 538         *height = self->height;
 539         *format = self->format;
 540
 541         // NB: Cloning is necessary with this producer (due to processing of images ahead of use)
 542         // The fault is not in the design of mlt, but in the implementation of the pixbuf producer...
 543         if ( self->image )
 544         {
 545                 // Clone the image
 546                 int image_size = mlt_image_format_size( self->format, self->width, self->height, NULL );
 547                 uint8_t *image_copy = mlt_pool_alloc( image_size );
 548                 memcpy( image_copy, self->image, image_size );
 549                 // Now update properties so we free the copy after
 550                 mlt_frame_set_image( frame, image_copy, image_size, mlt_pool_release );
 551                 // We're going to pass the copy on
 552                 *buffer = image_copy;
 553                 mlt_log_debug( MLT_PRODUCER_SERVICE( &self->parent ), "%dx%d (%s)\n",
 554                         self->width, self->height, mlt_image_format_name( *format ) );
 555                 // Clone the alpha channel
 556                 if ( self->alpha )
 557                 {
 558                         image_copy = mlt_pool_alloc( self->width * self->height );
 559                         memcpy( image_copy, self->alpha, self->width * self->height );
 560                         mlt_frame_set_alpha( frame, image_copy, self->width * self->height, mlt_pool_release );
 561                 }
 562         }
 563         else
 564         {
 565                 error = 1;
 566         }
 567
 568         // Release references and locks
 569         mlt_cache_item_close( self->pixbuf_cache );
 570         mlt_cache_item_close( self->image_cache );
 571         mlt_cache_item_close( self->alpha_cache );
 572         mlt_service_unlock( MLT_PRODUCER_SERVICE( &self->parent ) );
 573
 574         return error;
 575 }
 576
 577 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 578 {
 579         // Get the real structure for this producer
 580         producer_pixbuf self = producer->child;
 581
 582         // Fetch the producers properties
 583         mlt_properties producer_properties = MLT_PRODUCER_PROPERTIES( producer );
 584
 585         if ( self->filenames == NULL && mlt_properties_get( producer_properties, "resource" ) != NULL )
 586                 load_filenames( self, producer_properties );
 587
 588         // Generate a frame
 589         *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( producer ) );
 590
 591         if ( *frame != NULL && self->count > 0 )
 592         {
 593                 // Obtain properties of frame and producer
 594                 mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );
 595
 596                 // Set the producer on the frame properties
 597                 mlt_properties_set_data( properties, "producer_pixbuf", self, 0, NULL, NULL );
 598
 599                 // Update timecode on the frame we're creating
 600                 mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
 601
 602                 // Ensure that we have a way to obtain the position in the get_image
 603                 mlt_properties_set_position( properties, "pixbuf_position", mlt_producer_position( producer ) );
 604
 605                 // Refresh the pixbuf
 606                 self->pixbuf_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "pixbuf.pixbuf" );
 607                 self->pixbuf = mlt_cache_item_data( self->pixbuf_cache, NULL );
 608                 refresh_pixbuf( self, *frame );
 609                 mlt_cache_item_close( self->pixbuf_cache );
 610
 611                 // Set producer-specific frame properties
 612                 mlt_properties_set_int( properties, "progressive", mlt_properties_get_int( producer_properties, "progressive" ) );
 613
 614                 double force_ratio = mlt_properties_get_double( producer_properties, "force_aspect_ratio" );
 615                 if ( force_ratio > 0.0 )
 616                         mlt_properties_set_double( properties, "aspect_ratio", force_ratio );
 617                 else
 618                         mlt_properties_set_double( properties, "aspect_ratio", mlt_properties_get_double( producer_properties, "aspect_ratio" ) );
 619
 620                 // Push the get_image method
 621                 mlt_frame_push_get_image( *frame, producer_get_image );
 622         }
 623
 624         // Calculate the next timecode
 625         mlt_producer_prepare_next( producer );
 626
 627         return 0;
 628 }
 629
 630 static void producer_close( mlt_producer parent )
 631 {
 632         producer_pixbuf self = parent->child;
 633         parent->close = NULL;
 634         mlt_service_cache_purge( MLT_PRODUCER_SERVICE(parent) );
 635         mlt_producer_close( parent );
 636         mlt_properties_close( self->filenames );
 637         free( self );
 638 }