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>
25 #include <framework/mlt_factory.h>
30 #include <gdk-pixbuf/gdk-pixbuf.h>
32 static int filter_scale( mlt_frame
this, uint8_t **image
, mlt_image_format iformat
, mlt_image_format oformat
, int iwidth
, int iheight
, int owidth
, int oheight
)
35 mlt_properties properties
= MLT_FRAME_PROPERTIES( this );
37 // Get the requested interpolation method
38 char *interps
= mlt_properties_get( properties
, "rescale.interp" );
40 // Convert to the GTK flag
41 int interp
= PIXOPS_INTERP_BILINEAR
;
43 if ( strcmp( interps
, "nearest" ) == 0 )
44 interp
= PIXOPS_INTERP_NEAREST
;
45 else if ( strcmp( interps
, "tiles" ) == 0 )
46 interp
= PIXOPS_INTERP_TILES
;
47 else if ( strcmp( interps
, "hyper" ) == 0 )
48 interp
= PIXOPS_INTERP_HYPER
;
50 // Carry out the rescaling
51 if ( iformat
== mlt_image_yuv422
&& oformat
== mlt_image_yuv422
)
53 // Create the output image
54 uint8_t *output
= mlt_pool_alloc( owidth
* ( oheight
+ 1 ) * 2 );
57 int istride
= iwidth
* 2;
58 int ostride
= owidth
* 2;
60 yuv422_scale_simple( output
, owidth
, oheight
, ostride
, *image
, iwidth
, iheight
, istride
, interp
);
62 // Now update the frame
63 mlt_properties_set_data( properties
, "image", output
, owidth
* ( oheight
+ 1 ) * 2, ( mlt_destructor
)mlt_pool_release
, NULL
);
64 mlt_properties_set_int( properties
, "width", owidth
);
65 mlt_properties_set_int( properties
, "height", oheight
);
70 else if ( iformat
== mlt_image_rgb24
|| iformat
== mlt_image_rgb24a
)
72 int bpp
= (iformat
== mlt_image_rgb24a ?
4 : 3 );
74 // Create the yuv image
75 uint8_t *output
= mlt_pool_alloc( owidth
* ( oheight
+ 1 ) * 2 );
77 if ( strcmp( interps
, "none" ) && ( iwidth
!= owidth
|| iheight
!= oheight
) )
79 GdkPixbuf
*pixbuf
= gdk_pixbuf_new_from_data( *image
, GDK_COLORSPACE_RGB
,
80 ( iformat
== mlt_image_rgb24a
), 8, iwidth
, iheight
,
81 iwidth
* bpp
, NULL
, NULL
);
83 GdkPixbuf
*scaled
= gdk_pixbuf_scale_simple( pixbuf
, owidth
, oheight
, interp
);
84 g_object_unref( pixbuf
);
86 // Extract YUV422 and alpha
89 // Allocate the alpha mask
90 uint8_t *alpha
= mlt_pool_alloc( owidth
* ( oheight
+ 1 ) );
92 // Convert the image and extract alpha
93 mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( scaled
), owidth
, oheight
, gdk_pixbuf_get_rowstride( scaled
), output
, alpha
);
95 mlt_properties_set_data( properties
, "alpha", alpha
, owidth
* ( oheight
+ 1 ), ( mlt_destructor
)mlt_pool_release
, NULL
);
99 // No alpha to extract
100 mlt_convert_rgb24_to_yuv422( gdk_pixbuf_get_pixels( scaled
), owidth
, oheight
, gdk_pixbuf_get_rowstride( scaled
), output
);
102 g_object_unref( scaled
);
106 // Extract YUV422 and alpha
109 // Allocate the alpha mask
110 uint8_t *alpha
= mlt_pool_alloc( owidth
* ( oheight
+ 1 ) );
112 // Convert the image and extract alpha
113 mlt_convert_rgb24a_to_yuv422( *image
, owidth
, oheight
, owidth
* 4, output
, alpha
);
115 mlt_properties_set_data( properties
, "alpha", alpha
, owidth
* ( oheight
+ 1 ), ( mlt_destructor
)mlt_pool_release
, NULL
);
119 // No alpha to extract
120 mlt_convert_rgb24_to_yuv422( *image
, owidth
, oheight
, owidth
* 3, output
);
124 // Now update the frame
125 mlt_properties_set_data( properties
, "image", output
, owidth
* ( oheight
+ 1 ) * 2, ( mlt_destructor
)mlt_pool_release
, NULL
);
126 mlt_properties_set_int( properties
, "width", owidth
);
127 mlt_properties_set_int( properties
, "height", oheight
);
135 /** Constructor for the filter.
138 mlt_filter
filter_rescale_init( char *arg
)
140 // Create a new scaler
141 mlt_filter
this = mlt_factory_filter( "rescale", arg
);
143 // If successful, then initialise it
146 // Get the properties
147 mlt_properties properties
= MLT_FILTER_PROPERTIES( this );
149 // Set the inerpolation
150 mlt_properties_set( properties
, "interpolation", arg
== NULL ?
"bilinear" : arg
);
153 mlt_properties_set_data( properties
, "method", filter_scale
, 0, NULL
, NULL
);