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

   1 /*
   2  * filter_resize.c -- resizing filter
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include "filter_resize.h"
  22
  23 #include <framework/mlt_frame.h>
  24
  25 #include <stdio.h>
  26 #include <string.h>
  27 #include <stdlib.h>
  28
  29 /** Do it :-).
  30 */
  31
  32 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  33 {
  34         mlt_properties properties = mlt_frame_properties( this );
  35         int owidth = *width;
  36         int oheight = *height;
  37
  38         mlt_frame_get_image( this, image, format, &owidth, &oheight, writable );
  39
  40         if ( *width == 0 )
  41                 *width = 720;
  42         if ( *height == 0 )
  43                 *height = 576;
  44
  45         // Correct field order if needed
  46         if ( mlt_properties_get_int( properties, "top_field_first" ) == 1 )
  47         {
  48                 // Get the input image, width and height
  49                 int size;
  50                 uint8_t *image = mlt_properties_get_data( properties, "image", &size );
  51
  52                 // Keep the original image around to be destroyed on frame close
  53                 mlt_properties_rename( properties, "image", "original_image" );
  54
  55                 // Offset the image pointer by one line
  56                 image += owidth * 2;
  57                 size -= owidth * 2;
  58
  59                 // Set the new image pointer with no destructor
  60                 mlt_properties_set_data( properties, "image", image, size, NULL, NULL );
  61
  62                 // Set the normalised field order
  63                 mlt_properties_set_int( properties, "top_field_first", 0 );
  64         }
  65
  66         if ( !strcmp( mlt_properties_get( properties, "resize.scale" ), "affine" ) )
  67                 *image = mlt_frame_rescale_yuv422( this, *width, *height );
  68         else if ( strcmp( mlt_properties_get( properties, "resize.scale" ), "none" ) != 0 )
  69                 *image = mlt_frame_resize_yuv422( this, *width, *height );
  70         else
  71         {
  72                 *width = owidth;
  73                 *height = oheight;
  74         }
  75         return 0;
  76 }
  77
  78 /** Filter processing.
  79 */
  80
  81 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
  82 {
  83         mlt_frame_push_get_image( frame, filter_get_image );
  84         mlt_properties_set( mlt_frame_properties( frame ), "resize.scale", mlt_properties_get( mlt_filter_properties( this ), "scale" ) );
  85         return frame;
  86 }
  87
  88 /** Constructor for the filter.
  89 */
  90
  91 mlt_filter filter_resize_init( char *arg )
  92 {
  93         mlt_filter this = calloc( sizeof( struct mlt_filter_s ), 1 );
  94         if ( mlt_filter_init( this, this ) == 0 )
  95         {
  96                 this->process = filter_process;
  97                 if ( arg != NULL )
  98                         mlt_properties_set( mlt_filter_properties( this ), "scale", arg );
  99                 else
 100                         mlt_properties_set( mlt_filter_properties( this ), "scale", "off" );
 101         }
 102         return this;
 103 }
 104