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>
33 static int filter_get_image( mlt_frame
this, uint8_t **image
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
37 // Get the properties from the frame
38 mlt_properties properties
= MLT_FRAME_PROPERTIES( this );
40 // Pop the top of stack now
41 mlt_filter filter
= mlt_frame_pop_service( this );
43 // Retrieve the aspect ratio
44 double aspect_ratio
= mlt_deque_pop_back_double( MLT_FRAME_IMAGE_STACK( this ) );
46 // Assign requested width/height from our subordinate
48 int oheight
= *height
;
50 // Check for the special case - no aspect ratio means no problem :-)
51 if ( aspect_ratio
== 0.0 )
52 aspect_ratio
= mlt_properties_get_double( properties
, "consumer_aspect_ratio" );
54 // Reset the aspect ratio
55 mlt_properties_set_double( properties
, "aspect_ratio", aspect_ratio
);
58 char *rescale
= mlt_properties_get( properties
, "rescale.interp" );
59 if ( rescale
!= NULL
&& !strcmp( rescale
, "none" ) )
60 return mlt_frame_get_image( this, image
, format
, width
, height
, writable
);
62 if ( mlt_properties_get_int( properties
, "distort" ) == 0 )
64 // Normalise the input and out display aspect
65 int normalised_width
= mlt_properties_get_int( properties
, "normalised_width" );
66 int normalised_height
= mlt_properties_get_int( properties
, "normalised_height" );
67 int real_width
= mlt_properties_get_int( properties
, "real_width" );
68 int real_height
= mlt_properties_get_int( properties
, "real_height" );
69 if ( real_width
== 0 )
70 real_width
= mlt_properties_get_int( properties
, "width" );
71 if ( real_height
== 0 )
72 real_height
= mlt_properties_get_int( properties
, "height" );
73 double input_ar
= aspect_ratio
* real_width
/ real_height
;
74 double output_ar
= mlt_properties_get_double( properties
, "consumer_aspect_ratio" ) * owidth
/ oheight
;
76 //fprintf( stderr, "normalised %dx%d output %dx%d %f %f\n", normalised_width, normalised_height, owidth, oheight, ( float )output_ar, ( float )mlt_properties_get_double( properties, "consumer_aspect_ratio" ) * owidth / oheight );
78 // Optimised for the input_ar > output_ar case (e.g. widescreen on standard)
79 int scaled_width
= rint( 0.5 + ( input_ar
* normalised_width
) / output_ar
);
80 int scaled_height
= normalised_height
;
82 // Now ensure that our images fit in the output frame
83 if ( scaled_width
> normalised_width
)
85 scaled_width
= normalised_width
;
86 scaled_height
= rint( 0.5 + ( output_ar
* normalised_height
) / input_ar
);
89 // Now calculate the actual image size that we want
90 owidth
= rint( 0.5 + scaled_width
* owidth
/ normalised_width
);
91 oheight
= rint( 0.5 + scaled_height
* oheight
/ normalised_height
);
93 // Tell frame we have conformed the aspect to the consumer
94 mlt_frame_set_aspect_ratio( this, mlt_properties_get_double( properties
, "consumer_aspect_ratio" ) );
97 mlt_properties_set_int( properties
, "distort", 0 );
99 // Now pass on the calculations down the line
100 mlt_properties_set_int( properties
, "resize_width", *width
);
101 mlt_properties_set_int( properties
, "resize_height", *height
);
104 error
= mlt_frame_get_image( this, image
, format
, &owidth
, &oheight
, writable
);
106 // We only know how to process yuv422 at the moment
107 if ( error
== 0 && *format
== mlt_image_yuv422
&& *image
!= NULL
)
109 // Get the requested scale operation
110 char *op
= mlt_properties_get( MLT_FILTER_PROPERTIES( filter
), "scale" );
112 // Correct field order if needed
113 if ( mlt_properties_get_int( properties
, "top_field_first" ) == 1 )
115 // Get the input image, width and height
117 uint8_t *image
= mlt_properties_get_data( properties
, "image", &size
);
119 // Keep the original image around to be destroyed on frame close
120 mlt_properties_rename( properties
, "image", "original_image" );
122 // Duplicate the last line in the field to avoid artifact
123 memcpy( image
+ oheight
* owidth
* 2, image
+ oheight
* owidth
* 2 - owidth
* 4, owidth
* 2 );
125 // Offset the image pointer by one line
129 // Set the new image pointer with no destructor
130 mlt_properties_set_data( properties
, "image", image
, size
, NULL
, NULL
);
132 // Set the normalised field order
133 mlt_properties_set_int( properties
, "top_field_first", 0 );
136 if ( !strcmp( op
, "affine" ) )
138 *image
= mlt_frame_rescale_yuv422( this, *width
, *height
);
140 else if ( strcmp( op
, "none" ) != 0 )
142 *image
= mlt_frame_resize_yuv422( this, *width
, *height
);
154 /** Filter processing.
157 static mlt_frame
filter_process( mlt_filter
this, mlt_frame frame
)
159 // Store the aspect ratio reported by the source
160 mlt_deque_push_back_double( MLT_FRAME_IMAGE_STACK( frame
), mlt_frame_get_aspect_ratio( frame
) );
162 // Push this on to the service stack
163 mlt_frame_push_service( frame
, this );
165 // Push the get_image method on to the stack
166 mlt_frame_push_get_image( frame
, filter_get_image
);
171 /** Constructor for the filter.
174 mlt_filter
filter_resize_init( char *arg
)
176 mlt_filter
this = calloc( sizeof( struct mlt_filter_s
), 1 );
177 if ( mlt_filter_init( this, this ) == 0 )
179 this->process
= filter_process
;
180 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "scale", arg
== NULL ?
"off" : arg
);