research.m1stereo.tv/gitweb/ - melted/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 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 "producer_pixbuf.h"
  22 #include <framework/mlt_frame.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <gdk-pixbuf/gdk-pixbuf.h>
  27
  28 static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int index );
  29 static void producer_close( mlt_producer parent );
  30
  31 typedef enum
  32 {
  33         SIGNAL_FORMAT_PAL,
  34         SIGNAL_FORMAT_NTSC
  35 } mlt_signal_format;
  36
  37 mlt_producer producer_pixbuf_init( const char *filename )
  38 {
  39         producer_pixbuf this = calloc( sizeof( struct producer_pixbuf_s ), 1 );
  40         if ( this != NULL && mlt_producer_init( &this->parent, this ) == 0 )
  41         {
  42                 mlt_producer producer = &this->parent;
  43
  44                 producer->get_frame = producer_get_frame;
  45                 producer->close = producer_close;
  46
  47                 this->filename = strdup( filename );
  48                 this->counter = -1;
  49
  50                 // Get the properties interface
  51                 mlt_properties properties = mlt_producer_properties( &this->parent );
  52
  53                 // Set the default properties
  54                 mlt_properties_set_int( properties, "video_standard", mlt_video_standard_pal );
  55
  56                 g_type_init();
  57
  58                 return producer;
  59         }
  60         free( this );
  61         return NULL;
  62 }
  63
  64 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
  65 {
  66         // Obtain properties of frame
  67         mlt_properties properties = mlt_frame_properties( this );
  68
  69         // May need to know the size of the image to clone it
  70         int size = 0;
  71
  72         // Get the image
  73         uint8_t *image = mlt_properties_get_data( properties, "image", &size );
  74
  75         // Get width and height
  76         *width = mlt_properties_get_int( properties, "width" );
  77         *height = mlt_properties_get_int( properties, "height" );
  78
  79         // Clone if necessary
  80         if ( writable )
  81         {
  82                 // Clone our image
  83                 uint8_t *copy = malloc( size );
  84                 memcpy( copy, image, size );
  85
  86                 // We're going to pass the copy on
  87                 image = copy;
  88
  89                 // Now update properties so we free the copy after
  90                 mlt_properties_set_data( properties, "image", copy, size, free, NULL );
  91         }
  92
  93         // Pass on the image
  94         *buffer = image;
  95
  96         return 0;
  97 }
  98
  99 static uint8_t *producer_get_alpha_mask( mlt_frame this )
 100 {
 101         // Obtain properties of frame
 102         mlt_properties properties = mlt_frame_properties( this );
 103
 104         // Return the alpha mask
 105         return mlt_properties_get_data( properties, "alpha", NULL );
 106 }
 107
 108 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 109 {
 110         producer_pixbuf this = producer->child;
 111         GdkPixbuf *pixbuf = NULL;
 112         GError *error = NULL;
 113
 114         // Generate a frame
 115         *frame = mlt_frame_init( );
 116
 117         // Obtain properties of frame
 118         mlt_properties properties = mlt_frame_properties( *frame );
 119
 120     // optimization for subsequent iterations on single picture
 121         if ( this->image != NULL )
 122         {
 123                 // Set width/height
 124                 mlt_properties_set_int( properties, "width", this->width );
 125                 mlt_properties_set_int( properties, "height", this->height );
 126
 127                 // if picture sequence pass the image and alpha data without destructor
 128                 mlt_properties_set_data( properties, "image", this->image, 0, NULL, NULL );
 129                 mlt_properties_set_data( properties, "alpha", this->alpha, 0, NULL, NULL );
 130
 131                 // Set alpha mask call back
 132         ( *frame )->get_alpha_mask = producer_get_alpha_mask;
 133
 134                 // Stack the get image callback
 135                 mlt_frame_push_get_image( *frame, producer_get_image );
 136
 137         }
 138         else if ( strchr( this->filename, '%' ) != NULL )
 139         {
 140                 // handle picture sequences
 141                 char filename[1024];
 142                 filename[1023] = 0;
 143                 int current = this->counter;
 144                 do
 145                 {
 146                         ++this->counter;
 147                         snprintf( filename, 1023, this->filename, this->counter );
 148                         pixbuf = gdk_pixbuf_new_from_file( filename, &error );
 149                         // allow discontinuity in frame numbers up to 99
 150                         error = NULL;
 151                 } while ( pixbuf == NULL && ( this->counter - current ) < 100 );
 152         }
 153         else
 154         {
 155                 pixbuf = gdk_pixbuf_new_from_file( this->filename, &error );
 156         }
 157
 158         // If we have a pixbuf
 159         if ( pixbuf )
 160         {
 161                 // Scale to adjust for sample aspect ratio
 162                 if ( mlt_properties_get_int( properties, "video_stadnard" ) == mlt_video_standard_pal )
 163                 {
 164                         GdkPixbuf *temp = pixbuf;
 165                         GdkPixbuf *scaled = gdk_pixbuf_scale_simple( pixbuf,
 166                                 (gint) ( (float) gdk_pixbuf_get_width( pixbuf ) * 54.0/59.0),
 167                                 gdk_pixbuf_get_height( pixbuf ), GDK_INTERP_HYPER );
 168                         pixbuf = scaled;
 169                         g_object_unref( temp );
 170                 }
 171                 else
 172                 {
 173                         GdkPixbuf *temp = pixbuf;
 174                         GdkPixbuf *scaled = gdk_pixbuf_scale_simple( pixbuf,
 175                                 (gint) ( (float) gdk_pixbuf_get_width( pixbuf ) * 11.0/10.0 ),
 176                                 gdk_pixbuf_get_height( pixbuf ), GDK_INTERP_HYPER );
 177                         pixbuf = scaled;
 178                         g_object_unref( temp );
 179                 }
 180
 181                 // Store width and height
 182                 this->width = gdk_pixbuf_get_width( pixbuf );
 183                 this->height = gdk_pixbuf_get_height( pixbuf );
 184
 185                 // Allocate/define image and alpha
 186                 uint8_t *image = malloc( this->width * this->height * 2 );
 187                 uint8_t *alpha = NULL;
 188
 189                 // Extract YUV422 and alpha
 190                 if ( gdk_pixbuf_get_has_alpha( pixbuf ) )
 191                 {
 192                         // Allocate the alpha mask
 193                         alpha = malloc( this->width * this->height );
 194
 195                         // Convert the image
 196                         mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( pixbuf ),
 197                                                                                   this->width, this->height,
 198                                                                                   gdk_pixbuf_get_rowstride( pixbuf ),
 199                                                                                   image, alpha );
 200                 }
 201                 else
 202                 {
 203                         // No alpha to extract
 204                         mlt_convert_rgb24_to_yuv422( gdk_pixbuf_get_pixels( pixbuf ),
 205                                                                                  this->width, this->height,
 206                                                                                  gdk_pixbuf_get_rowstride( pixbuf ),
 207                                                                                  image );
 208                 }
 209
 210                 // Finished with pixbuf now
 211                 g_object_unref( pixbuf );
 212
 213                 // Set width/height of frame
 214                 mlt_properties_set_int( properties, "width", this->width );
 215                 mlt_properties_set_int( properties, "height", this->height );
 216
 217                 // Pass alpha and image on properties with or without destructor
 218                 if ( this->counter >= 0 )
 219                 {
 220                         // if picture sequence pass the image and alpha data with destructor
 221                         mlt_properties_set_data( properties, "image", image, 0, free, NULL );
 222                         mlt_properties_set_data( properties, "alpha", alpha, 0, free, NULL );
 223                 }
 224                 else
 225                 {
 226                         // if single picture, reference the image and alpha in the producer
 227                         this->image = image;
 228                         this->alpha = alpha;
 229
 230                         // pass the image and alpha data without destructor
 231                         mlt_properties_set_data( properties, "image", image, 0, NULL, NULL );
 232                         mlt_properties_set_data( properties, "alpha", alpha, 0, NULL, NULL );
 233                 }
 234
 235                 // Set alpha call back
 236                 ( *frame )->get_alpha_mask = producer_get_alpha_mask;
 237
 238                 // Push the get_image method
 239                 mlt_frame_push_get_image( *frame, producer_get_image );
 240         }
 241
 242         // Update timecode on the frame we're creating
 243         mlt_frame_set_timecode( *frame, mlt_producer_position( producer ) );
 244
 245         // Calculate the next timecode
 246         mlt_producer_prepare_next( producer );
 247
 248         return 0;
 249 }
 250
 251 static void producer_close( mlt_producer parent )
 252 {
 253         producer_pixbuf this = parent->child;
 254         if ( this->filename )
 255                 free( this->filename );
 256         if ( this->image )
 257                 free( this->image );
 258         if ( this->alpha )
 259                 free( this->alpha );
 260         parent->close = NULL;
 261         mlt_producer_close( parent );
 262         free( this );
 263 }
 264