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 <framework/mlt_tokeniser.h>
  26 #include <gdk-pixbuf/gdk-pixbuf.h>
  27
  28 #include "config.h"
  29
  30 #ifdef USE_EXIF
  31 #include <libexif/exif-data.h>
  32 #endif
  33
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <string.h>
  37 #include <pthread.h>
  38 #include <math.h>
  39 #include <sys/types.h>
  40 #include <sys/stat.h>
  41 #include <unistd.h>
  42 #include <dirent.h>
  43 #include <ctype.h>
  44
  45 // this protects concurrent access to gdk_pixbuf
  46 static pthread_mutex_t g_mutex = PTHREAD_MUTEX_INITIALIZER;
  47
  48 typedef struct producer_pixbuf_s *producer_pixbuf;
  49
  50 struct producer_pixbuf_s
  51 {
  52         struct mlt_producer_s parent;
  53
  54         // File name list
  55         mlt_properties filenames;
  56         int count;
  57         int image_idx;
  58         int pixbuf_idx;
  59         int width;
  60         int height;
  61         uint8_t *alpha;
  62         uint8_t *image;
  63         mlt_cache_item image_cache;
  64         mlt_cache_item alpha_cache;
  65         mlt_cache_item pixbuf_cache;
  66         GdkPixbuf *pixbuf;
  67         mlt_image_format format;
  68 };
  69
  70 static void load_filenames( producer_pixbuf self, mlt_properties producer_properties );
  71 static int refresh_pixbuf( producer_pixbuf self, mlt_frame frame );
  72 static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int index );
  73 static void producer_close( mlt_producer parent );
  74
  75 mlt_producer producer_pixbuf_init( char *filename )
  76 {
  77         producer_pixbuf self = calloc( 1, sizeof( struct producer_pixbuf_s ) );
  78         if ( self != NULL && mlt_producer_init( &self->parent, self ) == 0 )
  79         {
  80                 mlt_producer producer = &self->parent;
  81
  82                 // Get the properties interface
  83                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( &self->parent );
  84
  85                 // Callback registration
  86                 producer->get_frame = producer_get_frame;
  87                 producer->close = ( mlt_destructor )producer_close;
  88
  89                 // Set the default properties
  90                 mlt_properties_set( properties, "resource", filename );
  91                 mlt_properties_set_int( properties, "ttl", 25 );
  92                 mlt_properties_set_int( properties, "aspect_ratio", 1 );
  93                 mlt_properties_set_int( properties, "progressive", 1 );
  94                 mlt_properties_set_int( properties, "seekable", 1 );
  95                 mlt_properties_set_int( properties, "loop", 1 );
  96
  97                 // Validate the resource
  98                 if ( filename )
  99                         load_filenames( self, properties );
 100                 if ( self->count )
 101                 {
 102                         mlt_frame frame = mlt_frame_init( MLT_PRODUCER_SERVICE( producer ) );
 103                         if ( frame )
 104                         {
 105                                 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
 106                                 mlt_properties_set_data( frame_properties, "producer_pixbuf", self, 0, NULL, NULL );
 107                                 mlt_frame_set_position( frame, mlt_producer_position( producer ) );
 108                                 refresh_pixbuf( self, frame );
 109                                 mlt_cache_item_close( self->pixbuf_cache );
 110                                 mlt_frame_close( frame );
 111                         }
 112                 }
 113                 if ( self->width == 0 )
 114                 {
 115                         producer_close( producer );
 116                         producer = NULL;
 117                 }
 118                 return producer;
 119         }
 120         free( self );
 121         return NULL;
 122 }
 123
 124 static int load_svg( producer_pixbuf self, mlt_properties properties, const char *filename )
 125 {
 126         int result = 0;
 127
 128         // Read xml string
 129         if ( strstr( filename, "<svg" ) )
 130         {
 131                 // Generate a temporary file for the svg
 132                 char fullname[ 1024 ] = "/tmp/mlt.XXXXXX";
 133                 int fd = g_mkstemp( fullname );
 134
 135                 if ( fd > -1 )
 136                 {
 137                         // Write the svg into the temp file
 138                         ssize_t remaining_bytes;
 139                         const char *xml = filename;
 140
 141                         // Strip leading crap
 142                         while ( xml[0] != '<' )
 143                                 xml++;
 144
 145                         remaining_bytes = strlen( xml );
 146                         while ( remaining_bytes > 0 )
 147                                 remaining_bytes -= write( fd, xml + strlen( xml ) - remaining_bytes, remaining_bytes );
 148                         close( fd );
 149
 150                         mlt_properties_set( self->filenames, "0", fullname );
 151
 152                         // Teehe - when the producer closes, delete the temp file and the space allo
 153                         mlt_properties_set_data( properties, "__temporary_file__", fullname, 0, ( mlt_destructor )unlink, NULL );
 154                         result = 1;
 155                 }
 156         }
 157         return result;
 158 }
 159
 160 static int load_sequence_sprintf( producer_pixbuf self, mlt_properties properties, const char *filename )
 161 {
 162         int result = 0;
 163
 164         // Obtain filenames with pattern
 165         if ( strchr( filename, '%' ) != NULL )
 166         {
 167                 // handle picture sequences
 168                 int i = mlt_properties_get_int( properties, "begin" );
 169                 int gap = 0;
 170                 char full[1024];
 171                 int keyvalue = 0;
 172                 char key[ 50 ];
 173
 174                 while ( gap < 100 )
 175                 {
 176                         struct stat buf;
 177                         snprintf( full, 1023, filename, i ++ );
 178                         if ( stat( full, &buf ) == 0 )
 179                         {
 180                                 sprintf( key, "%d", keyvalue ++ );
 181                                 mlt_properties_set( self->filenames, key, full );
 182                                 gap = 0;
 183                         }
 184                         else
 185                         {
 186                                 gap ++;
 187                         }
 188                 }
 189                 if ( mlt_properties_count( self->filenames ) > 0 )
 190                 {
 191                         mlt_properties_set_int( properties, "ttl", 1 );
 192                         result = 1;
 193                 }
 194         }
 195         return result;
 196 }
 197
 198 static int load_sequence_deprecated( producer_pixbuf self, mlt_properties properties, const char *filename )
 199 {
 200         int result = 0;
 201         const char *start;
 202
 203         // This approach is deprecated in favor of the begin querystring parameter.
 204         // Obtain filenames with pattern containing a begin value, e.g. foo%1234d.png
 205         if ( ( start = strchr( filename, '%' ) ) )
 206         {
 207                 const char *end = ++start;
 208                 while ( isdigit( *end ) ) end++;
 209                 if ( end > start && ( end[0] == 'd' || end[0] == 'i' || end[0] == 'u' ) )
 210                 {
 211                         int n = end - start;
 212                         char *s = calloc( 1, n + 1 );
 213                         strncpy( s, start, n );
 214                         mlt_properties_set( properties, "begin", s );
 215                         free( s );
 216                         s = calloc( 1, strlen( filename ) + 2 );
 217                         strncpy( s, filename, start - filename );
 218                         sprintf( s + ( start - filename ), ".%d%s", n, end );
 219                         result = load_sequence_sprintf( self, properties, s );
 220                         free( s );
 221                 }
 222         }
 223         return result;
 224 }
 225
 226 static int load_sequence_querystring( producer_pixbuf self, mlt_properties properties, const char *filename )
 227 {
 228         int result = 0;
 229
 230         // Obtain filenames with pattern and begin value in query string
 231         if ( strchr( filename, '%' ) && strchr( filename, '?' ) )
 232         {
 233                 // Split filename into pattern and query string
 234                 char *s = strdup( filename );
 235                 char *querystring = strrchr( s, '?' );
 236                 *querystring++ = '\0';
 237                 if ( strstr( filename, "begin=" ) )
 238                         mlt_properties_set( properties, "begin", strstr( querystring, "begin=" ) + 6 );
 239                 else if ( strstr( filename, "begin:" ) )
 240                         mlt_properties_set( properties, "begin", strstr( querystring, "begin:" ) + 6 );
 241                 // Coerce to an int value so serialization does not have any extra query string cruft
 242                 mlt_properties_set_int( properties, "begin", mlt_properties_get_int( properties, "begin" ) );
 243                 result = load_sequence_sprintf( self, properties, s );
 244                 free( s );
 245         }
 246         return result;
 247 }
 248
 249 static int load_folder( producer_pixbuf self, mlt_properties properties, const char *filename )
 250 {
 251         int result = 0;
 252
 253         // Obtain filenames with folder
 254         if ( strstr( filename, "/.all." ) != NULL )
 255         {
 256                 char wildcard[ 1024 ];
 257                 char *dir_name = strdup( filename );
 258                 char *extension = strrchr( dir_name, '.' );
 259
 260                 *( strstr( dir_name, "/.all." ) + 1 ) = '\0';
 261                 sprintf( wildcard, "*%s", extension );
 262
 263                 mlt_properties_dir_list( self->filenames, dir_name, wildcard, 1 );
 264
 265                 free( dir_name );
 266                 result = 1;
 267         }
 268         return result;
 269 }
 270
 271 static void load_filenames( producer_pixbuf self, mlt_properties properties )
 272 {
 273         char *filename = mlt_properties_get( properties, "resource" );
 274         self->filenames = mlt_properties_new( );
 275
 276         if (!load_svg( self, properties, filename ) &&
 277                 !load_sequence_querystring( self, properties, filename ) &&
 278                 !load_sequence_sprintf( self, properties, filename ) &&
 279                 !load_sequence_deprecated( self, properties, filename ) &&
 280                 !load_folder( self, properties, filename ) )
 281         {
 282                 mlt_properties_set( self->filenames, "0", filename );
 283         }
 284         self->count = mlt_properties_count( self->filenames );
 285 }
 286
 287 static GdkPixbuf* reorient_with_exif( producer_pixbuf self, int image_idx, GdkPixbuf *pixbuf )
 288 {
 289 #ifdef USE_EXIF
 290         mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( &self->parent );
 291         ExifData *d = exif_data_new_from_file( mlt_properties_get_value( self->filenames, image_idx ) );
 292         ExifEntry *entry;
 293         int exif_orientation = 0;
 294
 295         /* get orientation and rotate image accordingly if necessary */
 296         if (d)
 297         {
 298                 if ( ( entry = exif_content_get_entry ( d->ifd[EXIF_IFD_0], EXIF_TAG_ORIENTATION ) ) )
 299                         exif_orientation = exif_get_short (entry->data, exif_data_get_byte_order (d));
 300
 301                 /* Free the EXIF data */
 302                 exif_data_unref(d);
 303         }
 304
 305         // Remember EXIF value, might be useful for someone
 306         mlt_properties_set_int( producer_props, "_exif_orientation" , exif_orientation );
 307
 308         if ( exif_orientation > 1 )
 309         {
 310                 GdkPixbuf *processed = NULL;
 311                 GdkPixbufRotation matrix = GDK_PIXBUF_ROTATE_NONE;
 312
 313                 // Rotate image according to exif data
 314                 switch ( exif_orientation ) {
 315                   case 2:
 316                           processed = gdk_pixbuf_flip ( pixbuf, TRUE );
 317                           break;
 318                   case 3:
 319                           matrix = GDK_PIXBUF_ROTATE_UPSIDEDOWN;
 320                           processed = pixbuf;
 321                           break;
 322                   case 4:
 323                           processed = gdk_pixbuf_flip ( pixbuf, FALSE );
 324                           break;
 325                   case 5:
 326                           matrix = GDK_PIXBUF_ROTATE_COUNTERCLOCKWISE;
 327                           processed = gdk_pixbuf_flip ( pixbuf, TRUE );
 328                           break;
 329                   case 6:
 330                           matrix = GDK_PIXBUF_ROTATE_CLOCKWISE;
 331                           processed = pixbuf;
 332                           break;
 333                   case 7:
 334                           matrix = GDK_PIXBUF_ROTATE_CLOCKWISE;
 335                           processed = gdk_pixbuf_flip ( pixbuf, TRUE );
 336                           break;
 337                   case 8:
 338                           matrix = GDK_PIXBUF_ROTATE_COUNTERCLOCKWISE;
 339                           processed = pixbuf;
 340                           break;
 341                 }
 342                 if ( processed )
 343                 {
 344                         pixbuf = gdk_pixbuf_rotate_simple( processed, matrix );
 345                         g_object_unref( processed );
 346                 }
 347         }
 348 #endif
 349         return pixbuf;
 350 }
 351
 352 static int refresh_pixbuf( producer_pixbuf self, mlt_frame frame )
 353 {
 354         // Obtain properties of frame and producer
 355         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
 356         mlt_producer producer = &self->parent;
 357         mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );
 358
 359         // Check if user wants us to reload the image
 360         if ( mlt_properties_get_int( producer_props, "force_reload" ) )
 361         {
 362                 self->pixbuf = NULL;
 363                 self->image = NULL;
 364                 mlt_properties_set_int( producer_props, "force_reload", 0 );
 365         }
 366
 367         // Get the time to live for each frame
 368         double ttl = mlt_properties_get_int( producer_props, "ttl" );
 369
 370         // Get the original position of this frame
 371         mlt_position position = mlt_frame_original_position( frame );
 372         position += mlt_producer_get_in( producer );
 373
 374         // Image index
 375         int loop = mlt_properties_get_int( producer_props, "loop" );
 376         int current_idx;
 377         if (loop) {
 378                 current_idx = ( int )floor( ( double )position / ttl ) % self->count;
 379         } else {
 380                 current_idx = MIN(( double )position / ttl, self->count - 1);
 381         }
 382
 383         // Key for the cache
 384         char image_key[ 10 ];
 385         sprintf( image_key, "%d", current_idx );
 386
 387         int disable_exif = mlt_properties_get_int( producer_props, "disable_exif" );
 388
 389         if ( current_idx != self->pixbuf_idx )
 390                 self->pixbuf = NULL;
 391         if ( !self->pixbuf || mlt_properties_get_int( producer_props, "_disable_exif" ) != disable_exif )
 392         {
 393                 GError *error = NULL;
 394
 395                 self->image = NULL;
 396                 pthread_mutex_lock( &g_mutex );
 397                 self->pixbuf = gdk_pixbuf_new_from_file( mlt_properties_get_value( self->filenames, current_idx ), &error );
 398                 if ( self->pixbuf )
 399                 {
 400                         // Read the exif value for this file
 401                         if ( !disable_exif )
 402                                 self->pixbuf = reorient_with_exif( self, current_idx, self->pixbuf );
 403
 404                         // Register this pixbuf for destruction and reuse
 405                         mlt_cache_item_close( self->pixbuf_cache );
 406                         mlt_service_cache_put( MLT_PRODUCER_SERVICE( producer ), "pixbuf.pixbuf", self->pixbuf, 0, ( mlt_destructor )g_object_unref );
 407                         self->pixbuf_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "pixbuf.pixbuf" );
 408                         self->pixbuf_idx = current_idx;
 409
 410                         // Store the width/height of the pixbuf temporarily
 411                         self->width = gdk_pixbuf_get_width( self->pixbuf );
 412                         self->height = gdk_pixbuf_get_height( self->pixbuf );
 413
 414                         mlt_events_block( producer_props, NULL );
 415                         mlt_properties_set_int( producer_props, "meta.media.width", self->width );
 416                         mlt_properties_set_int( producer_props, "meta.media.height", self->height );
 417                         mlt_properties_set_int( producer_props, "_disable_exif", disable_exif );
 418                         mlt_events_unblock( producer_props, NULL );
 419
 420                 }
 421                 pthread_mutex_unlock( &g_mutex );
 422         }
 423
 424         // Set width/height of frame
 425         mlt_properties_set_int( properties, "width", self->width );
 426         mlt_properties_set_int( properties, "height", self->height );
 427
 428         return current_idx;
 429 }
 430
 431 static void refresh_image( producer_pixbuf self, mlt_frame frame, mlt_image_format format, int width, int height )
 432 {
 433         // Obtain properties of frame and producer
 434         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
 435         mlt_producer producer = &self->parent;
 436
 437         // Get index and pixbuf
 438         int current_idx = refresh_pixbuf( self, frame );
 439
 440         // optimization for subsequent iterations on single picture
 441         if ( current_idx != self->image_idx || width != self->width || height != self->height )
 442                 self->image = NULL;
 443         mlt_log_debug( MLT_PRODUCER_SERVICE( producer ), "image %p pixbuf %p idx %d current_idx %d pixbuf_idx %d width %d\n",
 444                 self->image, self->pixbuf, current_idx, self->image_idx, self->pixbuf_idx, width );
 445
 446         // If we have a pixbuf and we need an image
 447         if ( self->pixbuf && ( !self->image || ( format != mlt_image_none && format != self->format ) ) )
 448         {
 449                 char *interps = mlt_properties_get( properties, "rescale.interp" );
 450                 int interp = GDK_INTERP_BILINEAR;
 451
 452                 if ( !interps ) {
 453                         // Keep bilinear by default
 454                 }
 455                 else if ( strcmp( interps, "nearest" ) == 0 )
 456                         interp = GDK_INTERP_NEAREST;
 457                 else if ( strcmp( interps, "tiles" ) == 0 )
 458                         interp = GDK_INTERP_TILES;
 459                 else if ( strcmp( interps, "hyper" ) == 0 || strcmp( interps, "bicubic" ) == 0 )
 460                         interp = GDK_INTERP_HYPER;
 461
 462                 // Note - the original pixbuf is already safe and ready for destruction
 463                 pthread_mutex_lock( &g_mutex );
 464                 GdkPixbuf* pixbuf = gdk_pixbuf_scale_simple( self->pixbuf, width, height, interp );
 465
 466                 // Store width and height
 467                 self->width = width;
 468                 self->height = height;
 469
 470                 // Allocate/define image
 471                 int has_alpha = gdk_pixbuf_get_has_alpha( pixbuf );
 472                 int src_stride = gdk_pixbuf_get_rowstride( pixbuf );
 473                 int dst_stride = self->width * ( has_alpha ? 4 : 3 );
 474                 int image_size = dst_stride * ( height + 1 );
 475                 self->image = mlt_pool_alloc( image_size );
 476                 self->alpha = NULL;
 477                 self->format = has_alpha ? mlt_image_rgb24a : mlt_image_rgb24;
 478
 479                 if ( src_stride != dst_stride )
 480                 {
 481                         int y = self->height;
 482                         uint8_t *src = gdk_pixbuf_get_pixels( pixbuf );
 483                         uint8_t *dst = self->image;
 484                         while ( y-- )
 485                         {
 486                                 memcpy( dst, src, dst_stride );
 487                                 dst += dst_stride;
 488                                 src += src_stride;
 489                         }
 490                 }
 491                 else
 492                 {
 493                         memcpy( self->image, gdk_pixbuf_get_pixels( pixbuf ), src_stride * height );
 494                 }
 495                 pthread_mutex_unlock( &g_mutex );
 496
 497                 // Convert image to requested format
 498                 if ( format != mlt_image_none && format != self->format )
 499                 {
 500                         uint8_t *buffer = NULL;
 501
 502                         // First, set the image so it can be converted when we get it
 503                         mlt_frame_replace_image( frame, self->image, self->format, width, height );
 504                         mlt_frame_set_image( frame, self->image, image_size, mlt_pool_release );
 505                         self->format = format;
 506
 507                         // get_image will do the format conversion
 508                         mlt_frame_get_image( frame, &buffer, &format, &width, &height, 0 );
 509
 510                         // cache copies of the image and alpha buffers
 511                         if ( buffer )
 512                         {
 513                                 image_size = mlt_image_format_size( format, width, height, NULL );
 514                                 self->image = mlt_pool_alloc( image_size );
 515                                 memcpy( self->image, buffer, image_size );
 516                         }
 517                         if ( ( buffer = mlt_frame_get_alpha_mask( frame ) ) )
 518                         {
 519                                 self->alpha = mlt_pool_alloc( width * height );
 520                                 memcpy( self->alpha, buffer, width * height );
 521                         }
 522                 }
 523
 524                 // Update the cache
 525                 mlt_cache_item_close( self->image_cache );
 526                 mlt_service_cache_put( MLT_PRODUCER_SERVICE( producer ), "pixbuf.image", self->image, image_size, mlt_pool_release );
 527                 self->image_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "pixbuf.image" );
 528                 self->image_idx = current_idx;
 529                 mlt_cache_item_close( self->alpha_cache );
 530                 self->alpha_cache = NULL;
 531                 if ( self->alpha )
 532                 {
 533                         mlt_service_cache_put( MLT_PRODUCER_SERVICE( producer ), "pixbuf.alpha", self->alpha, width * height, mlt_pool_release );
 534                         self->alpha_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "pixbuf.alpha" );
 535                 }
 536
 537                 // Finished with pixbuf now
 538                 g_object_unref( pixbuf );
 539         }
 540
 541         // Set width/height of frame
 542         mlt_properties_set_int( properties, "width", self->width );
 543         mlt_properties_set_int( properties, "height", self->height );
 544 }
 545
 546 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 547 {
 548         int error = 0;
 549
 550         // Obtain properties of frame and producer
 551         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
 552         producer_pixbuf self = mlt_properties_get_data( properties, "producer_pixbuf", NULL );
 553         mlt_producer producer = &self->parent;
 554
 555         // Use the width and height suggested by the rescale filter because we can do our own scaling.
 556         *width = mlt_properties_get_int( properties, "rescale_width" );
 557         *height = mlt_properties_get_int( properties, "rescale_height" );
 558
 559         // Restore pixbuf and image
 560         mlt_service_lock( MLT_PRODUCER_SERVICE( producer ) );
 561         self->pixbuf_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "pixbuf.pixbuf" );
 562         self->pixbuf = mlt_cache_item_data( self->pixbuf_cache, NULL );
 563         self->image_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "pixbuf.image" );
 564         self->image = mlt_cache_item_data( self->image_cache, NULL );
 565         self->alpha_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "pixbuf.alpha" );
 566         self->alpha = mlt_cache_item_data( self->alpha_cache, NULL );
 567
 568         // Refresh the image
 569         refresh_image( self, frame, *format, *width, *height );
 570
 571         // Get width and height (may have changed during the refresh)
 572         *width = self->width;
 573         *height = self->height;
 574         *format = self->format;
 575
 576         // NB: Cloning is necessary with this producer (due to processing of images ahead of use)
 577         // The fault is not in the design of mlt, but in the implementation of the pixbuf producer...
 578         if ( self->image )
 579         {
 580                 // Clone the image
 581                 int image_size = mlt_image_format_size( self->format, self->width, self->height, NULL );
 582                 uint8_t *image_copy = mlt_pool_alloc( image_size );
 583                 memcpy( image_copy, self->image, image_size );
 584                 // Now update properties so we free the copy after
 585                 mlt_frame_set_image( frame, image_copy, image_size, mlt_pool_release );
 586                 // We're going to pass the copy on
 587                 *buffer = image_copy;
 588                 mlt_log_debug( MLT_PRODUCER_SERVICE( &self->parent ), "%dx%d (%s)\n",
 589                         self->width, self->height, mlt_image_format_name( *format ) );
 590                 // Clone the alpha channel
 591                 if ( self->alpha )
 592                 {
 593                         image_copy = mlt_pool_alloc( self->width * self->height );
 594                         memcpy( image_copy, self->alpha, self->width * self->height );
 595                         mlt_frame_set_alpha( frame, image_copy, self->width * self->height, mlt_pool_release );
 596                 }
 597         }
 598         else
 599         {
 600                 error = 1;
 601         }
 602
 603         // Release references and locks
 604         mlt_cache_item_close( self->pixbuf_cache );
 605         mlt_cache_item_close( self->image_cache );
 606         mlt_cache_item_close( self->alpha_cache );
 607         mlt_service_unlock( MLT_PRODUCER_SERVICE( &self->parent ) );
 608
 609         return error;
 610 }
 611
 612 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 613 {
 614         // Get the real structure for this producer
 615         producer_pixbuf self = producer->child;
 616
 617         // Fetch the producers properties
 618         mlt_properties producer_properties = MLT_PRODUCER_PROPERTIES( producer );
 619
 620         if ( self->filenames == NULL && mlt_properties_get( producer_properties, "resource" ) != NULL )
 621                 load_filenames( self, producer_properties );
 622
 623         // Generate a frame
 624         *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( producer ) );
 625
 626         if ( *frame != NULL && self->count > 0 )
 627         {
 628                 // Obtain properties of frame and producer
 629                 mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );
 630
 631                 // Set the producer on the frame properties
 632                 mlt_properties_set_data( properties, "producer_pixbuf", self, 0, NULL, NULL );
 633
 634                 // Update timecode on the frame we're creating
 635                 mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
 636
 637                 // Refresh the pixbuf
 638                 self->pixbuf_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "pixbuf.pixbuf" );
 639                 self->pixbuf = mlt_cache_item_data( self->pixbuf_cache, NULL );
 640                 refresh_pixbuf( self, *frame );
 641                 mlt_cache_item_close( self->pixbuf_cache );
 642
 643                 // Set producer-specific frame properties
 644                 mlt_properties_set_int( properties, "progressive", mlt_properties_get_int( producer_properties, "progressive" ) );
 645
 646                 double force_ratio = mlt_properties_get_double( producer_properties, "force_aspect_ratio" );
 647                 if ( force_ratio > 0.0 )
 648                         mlt_properties_set_double( properties, "aspect_ratio", force_ratio );
 649                 else
 650                         mlt_properties_set_double( properties, "aspect_ratio", mlt_properties_get_double( producer_properties, "aspect_ratio" ) );
 651
 652                 // Push the get_image method
 653                 mlt_frame_push_get_image( *frame, producer_get_image );
 654         }
 655
 656         // Calculate the next timecode
 657         mlt_producer_prepare_next( producer );
 658
 659         return 0;
 660 }
 661
 662 static void producer_close( mlt_producer parent )
 663 {
 664         producer_pixbuf self = parent->child;
 665         parent->close = NULL;
 666         mlt_service_cache_purge( MLT_PRODUCER_SERVICE(parent) );
 667         mlt_producer_close( parent );
 668         mlt_properties_close( self->filenames );
 669         free( self );
 670 }