2 * filter_rescale.c -- scale the producer video frame size to match the consumer
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Dan Dennedy <dan@dennedy.org>
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_rescale.h"
24 #include <framework/mlt_frame.h>
29 #include <gdk-pixbuf/gdk-pixbuf.h>
35 static int filter_get_image( mlt_frame
this, uint8_t **image
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
42 mlt_properties properties
= mlt_frame_properties( this );
44 int iheight
= *height
;
46 int oheight
= *height
;
47 uint8_t *input
= NULL
;
48 char *interps
= mlt_properties_get( properties
, "rescale.interp" );
49 int interp
= PIXOPS_INTERP_BILINEAR
;
51 if ( strcmp( interps
, "nearest" ) == 0 )
52 interp
= PIXOPS_INTERP_NEAREST
;
53 else if ( strcmp( interps
, "tiles" ) == 0 )
54 interp
= PIXOPS_INTERP_TILES
;
55 else if ( strcmp( interps
, "hyper" ) == 0 )
56 interp
= PIXOPS_INTERP_HYPER
;
58 // If real_width/height exist, we want that as minimum information
59 if ( mlt_properties_get_int( properties
, "real_width" ) )
61 iwidth
= mlt_properties_get_int( properties
, "real_width" );
62 iheight
= mlt_properties_get_int( properties
, "real_height" );
65 // Let the producer know what we are actually requested to obtain
66 mlt_properties_set_int( properties
, "rescale_width", *width
);
67 mlt_properties_set_int( properties
, "rescale_height", *height
);
69 // Get the image as requested
70 mlt_frame_get_image( this, &input
, format
, &iwidth
, &iheight
, writable
);
74 // If width and height are correct, don't do anything
75 if ( *format
== mlt_image_yuv422
&& strcmp( interps
, "none" ) && ( iwidth
!= owidth
|| iheight
!= oheight
) )
77 // Create the output image
79 uint8_t *output
= malloc( owidth
* ( oheight
+ 1 ) * 2 );
82 int istride
= iwidth
* 2;
83 int ostride
= owidth
* 2;
85 yuv422_scale_simple( output
, owidth
, oheight
, ostride
, input
, iwidth
, iheight
, istride
, interp
);
87 // Now update the frame
88 mlt_properties_set_data( properties
, "image", output
, owidth
* ( oheight
+ 1 ) * 2, free
, NULL
);
89 mlt_properties_set_int( properties
, "width", owidth
);
90 mlt_properties_set_int( properties
, "height", oheight
);
95 else if ( *format
== mlt_image_rgb24
|| *format
== mlt_image_rgb24a
)
97 int bpp
= (*format
== mlt_image_rgb24a ?
4 : 3 );
99 // Create the yuv image
101 uint8_t *output
= malloc( owidth
* ( oheight
+ 1 ) * 2 );
103 if ( strcmp( interps
, "none" ) && ( iwidth
!= owidth
|| iheight
!= oheight
) )
105 GdkPixbuf
*pixbuf
= gdk_pixbuf_new_from_data( input
, GDK_COLORSPACE_RGB
,
106 ( *format
== mlt_image_rgb24a
), 8, iwidth
, iheight
,
107 iwidth
* bpp
, NULL
, NULL
);
109 GdkPixbuf
*scaled
= gdk_pixbuf_scale_simple( pixbuf
, owidth
, oheight
, interp
);
110 g_object_unref( pixbuf
);
112 // Extract YUV422 and alpha
115 // Allocate the alpha mask
117 uint8_t *alpha
= malloc( owidth
* ( oheight
+ 1 ) );
119 // Convert the image and extract alpha
120 mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( scaled
),
122 gdk_pixbuf_get_rowstride( scaled
),
125 mlt_properties_set_data( properties
, "alpha", alpha
, owidth
* ( oheight
+ 1 ), free
, NULL
);
129 // No alpha to extract
130 mlt_convert_rgb24_to_yuv422( gdk_pixbuf_get_pixels( scaled
),
132 gdk_pixbuf_get_rowstride( scaled
),
135 g_object_unref( scaled
);
139 // Extract YUV422 and alpha
142 // Allocate the alpha mask
144 uint8_t *alpha
= malloc( owidth
* ( oheight
+ 1 ) );
146 // Convert the image and extract alpha
147 mlt_convert_rgb24a_to_yuv422( input
,
152 mlt_properties_set_data( properties
, "alpha", alpha
, owidth
* ( oheight
+ 1 ), free
, NULL
);
156 // No alpha to extract
157 mlt_convert_rgb24_to_yuv422( input
,
164 // Now update the frame
165 mlt_properties_set_data( properties
, "image", output
, owidth
* ( oheight
+ 1 ) * 2, free
, NULL
);
166 mlt_properties_set_int( properties
, "width", owidth
);
167 mlt_properties_set_int( properties
, "height", oheight
);
170 *format
= mlt_image_yuv422
;
184 static uint8_t *producer_get_alpha_mask( mlt_frame
this )
186 // Obtain properties of frame
187 mlt_properties properties
= mlt_frame_properties( this );
189 // Return the alpha mask
190 return mlt_properties_get_data( properties
, "alpha", NULL
);
193 /** Filter processing.
196 static mlt_frame
filter_process( mlt_filter
this, mlt_frame frame
)
198 mlt_frame_push_get_image( frame
, filter_get_image
);
199 mlt_properties_set( mlt_frame_properties( frame
), "rescale.interp",
200 mlt_properties_get( mlt_filter_properties( this ), "interpolation" ) );
202 // Set alpha call back
203 frame
->get_alpha_mask
= producer_get_alpha_mask
;
207 /** Constructor for the filter.
210 mlt_filter
filter_rescale_init( char *arg
)
212 mlt_filter
this = calloc( sizeof( struct mlt_filter_s
), 1 );
213 if ( mlt_filter_init( this, this ) == 0 )
215 this->process
= filter_process
;
217 mlt_properties_set( mlt_filter_properties( this ), "interpolation", arg
);
219 mlt_properties_set( mlt_filter_properties( this ), "interpolation", "bilinear" );