2 * filter_resize.c -- resizing filter
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@pandora.be>
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.
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.
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.
21 #include "filter_resize.h"
23 #include <framework/mlt_frame.h>
32 static int filter_get_image( mlt_frame
this, uint8_t **image
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
34 mlt_properties properties
= mlt_frame_properties( this );
36 int oheight
= *height
;
38 mlt_frame_get_image( this, image
, format
, &owidth
, &oheight
, writable
);
45 // Correct field order if needed
46 if ( mlt_properties_get_int( properties
, "top_field_first" ) == 1 )
48 // Get the input image, width and height
50 uint8_t *image
= mlt_properties_get_data( properties
, "image", &size
);
52 // Keep the original image around to be destroyed on frame close
53 mlt_properties_rename( properties
, "image", "original_image" );
55 // Offset the image pointer by one line
59 // Set the new image pointer with no destructor
60 mlt_properties_set_data( properties
, "image", image
, size
, NULL
, NULL
);
62 // Set the normalised field order
63 mlt_properties_set_int( properties
, "top_field_first", 0 );
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
);
78 /** Filter processing.
81 static mlt_frame
filter_process( mlt_filter
this, mlt_frame frame
)
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" ) );
88 /** Constructor for the filter.
91 mlt_filter
filter_resize_init( char *arg
)
93 mlt_filter
this = calloc( sizeof( struct mlt_filter_s
), 1 );
94 if ( mlt_filter_init( this, this ) == 0 )
96 this->process
= filter_process
;
98 mlt_properties_set( mlt_filter_properties( this ), "scale", arg
);
100 mlt_properties_set( mlt_filter_properties( this ), "scale", "off" );