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
78 uint8_t *output
= mlt_pool_alloc( owidth
* ( oheight
+ 1 ) * 2 );
81 int istride
= iwidth
* 2;
82 int ostride
= owidth
* 2;
84 yuv422_scale_simple( output
, owidth
, oheight
, ostride
, input
, iwidth
, iheight
, istride
, interp
);
86 // Now update the frame
87 mlt_properties_set_data( properties
, "image", output
, owidth
* ( oheight
+ 1 ) * 2, ( mlt_destructor
)mlt_pool_release
, NULL
);
88 mlt_properties_set_int( properties
, "width", owidth
);
89 mlt_properties_set_int( properties
, "height", oheight
);
94 else if ( *format
== mlt_image_rgb24
|| *format
== mlt_image_rgb24a
)
96 int bpp
= (*format
== mlt_image_rgb24a ?
4 : 3 );
98 // Create the yuv image
99 uint8_t *output
= mlt_pool_alloc( owidth
* ( oheight
+ 1 ) * 2 );
101 if ( strcmp( interps
, "none" ) && ( iwidth
!= owidth
|| iheight
!= oheight
) )
103 GdkPixbuf
*pixbuf
= gdk_pixbuf_new_from_data( input
, GDK_COLORSPACE_RGB
,
104 ( *format
== mlt_image_rgb24a
), 8, iwidth
, iheight
,
105 iwidth
* bpp
, NULL
, NULL
);
107 GdkPixbuf
*scaled
= gdk_pixbuf_scale_simple( pixbuf
, owidth
, oheight
, interp
);
108 g_object_unref( pixbuf
);
110 // Extract YUV422 and alpha
113 // Allocate the alpha mask
114 uint8_t *alpha
= mlt_pool_alloc( owidth
* ( oheight
+ 1 ) );
116 // Convert the image and extract alpha
117 mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( scaled
),
119 gdk_pixbuf_get_rowstride( scaled
),
122 mlt_properties_set_data( properties
, "alpha", alpha
, owidth
* ( oheight
+ 1 ), ( mlt_destructor
)mlt_pool_release
, NULL
);
126 // No alpha to extract
127 mlt_convert_rgb24_to_yuv422( gdk_pixbuf_get_pixels( scaled
),
129 gdk_pixbuf_get_rowstride( scaled
),
132 g_object_unref( scaled
);
136 // Extract YUV422 and alpha
139 // Allocate the alpha mask
140 uint8_t *alpha
= mlt_pool_alloc( owidth
* ( oheight
+ 1 ) );
142 // Convert the image and extract alpha
143 mlt_convert_rgb24a_to_yuv422( input
,
148 mlt_properties_set_data( properties
, "alpha", alpha
, owidth
* ( oheight
+ 1 ), ( mlt_destructor
)mlt_pool_release
, NULL
);
152 // No alpha to extract
153 mlt_convert_rgb24_to_yuv422( input
,
160 // Now update the frame
161 mlt_properties_set_data( properties
, "image", output
, owidth
* ( oheight
+ 1 ) * 2, ( mlt_destructor
)mlt_pool_release
, NULL
);
162 mlt_properties_set_int( properties
, "width", owidth
);
163 mlt_properties_set_int( properties
, "height", oheight
);
166 *format
= mlt_image_yuv422
;
180 static uint8_t *producer_get_alpha_mask( mlt_frame
this )
182 // Obtain properties of frame
183 mlt_properties properties
= mlt_frame_properties( this );
185 // Return the alpha mask
186 return mlt_properties_get_data( properties
, "alpha", NULL
);
189 /** Filter processing.
192 static mlt_frame
filter_process( mlt_filter
this, mlt_frame frame
)
194 mlt_frame_push_get_image( frame
, filter_get_image
);
195 mlt_properties_set( mlt_frame_properties( frame
), "rescale.interp",
196 mlt_properties_get( mlt_filter_properties( this ), "interpolation" ) );
198 // Set alpha call back
199 frame
->get_alpha_mask
= producer_get_alpha_mask
;
203 /** Constructor for the filter.
206 mlt_filter
filter_rescale_init( char *arg
)
208 mlt_filter
this = mlt_filter_new( );
211 this->process
= filter_process
;
212 mlt_properties_set( mlt_filter_properties( this ), "interpolation", arg
== NULL ?
"bilinear" : arg
);