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