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Rescaler and fezzik rework (to allow inclusion of mc scaler)
[mlt] / src / modules / gtk2 / filter_rescale.c
1 /*
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>
5  *
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.
10  *
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.
15  *
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.
19  */
20
21 #include "filter_rescale.h"
22 #include "pixops.h"
23
24 #include <framework/mlt_frame.h>
25 #include <framework/mlt_factory.h>
26
27 #include <stdio.h>
28 #include <string.h>
29 #include <stdlib.h>
30 #include <gdk-pixbuf/gdk-pixbuf.h>
31
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 )
33 {
34         // Get the properties
35         mlt_properties properties = mlt_frame_properties( this );
36
37         // Get the requested interpolation method
38         char *interps = mlt_properties_get( properties, "rescale.interp" );
39
40         // Convert to the GTK flag
41         int interp = PIXOPS_INTERP_BILINEAR;
42
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;
49
50         // Carry out the rescaling
51         if ( iformat == mlt_image_yuv422 && oformat == mlt_image_yuv422 )
52         {
53                 // Create the output image
54                 uint8_t *output = mlt_pool_alloc( owidth * ( oheight + 1 ) * 2 );
55
56                 // Calculate strides
57                 int istride = iwidth * 2;
58                 int ostride = owidth * 2;
59
60                 yuv422_scale_simple( output, owidth, oheight, ostride, *image, iwidth, iheight, istride, interp );
61                 
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 );
66
67                 // Return the output
68                 *image = output;
69         }
70         else if ( iformat == mlt_image_rgb24 || iformat == mlt_image_rgb24a )
71         {
72                 int bpp = (iformat == mlt_image_rgb24a ? 4 : 3 );
73                         
74                 // Create the yuv image
75                 uint8_t *output = mlt_pool_alloc( owidth * ( oheight + 1 ) * 2 );
76
77                 if ( strcmp( interps, "none" ) && ( iwidth != owidth || iheight != oheight ) )
78                 {
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 );
82
83                         GdkPixbuf *scaled = gdk_pixbuf_scale_simple( pixbuf, owidth, oheight, interp );
84                         g_object_unref( pixbuf );
85                         
86                         // Extract YUV422 and alpha
87                         if ( bpp == 4 )
88                         {
89                                 // Allocate the alpha mask
90                                 uint8_t *alpha = mlt_pool_alloc( owidth * ( oheight + 1 ) );
91
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 );
94
95                                 mlt_properties_set_data( properties, "alpha", alpha, owidth * ( oheight + 1 ), ( mlt_destructor )mlt_pool_release, NULL );
96                         }
97                         else
98                         {
99                                 // No alpha to extract
100                                 mlt_convert_rgb24_to_yuv422( gdk_pixbuf_get_pixels( scaled ), owidth, oheight, gdk_pixbuf_get_rowstride( scaled ), output );
101                         }
102                         g_object_unref( scaled );
103                 }
104                 else
105                 {
106                         // Extract YUV422 and alpha
107                         if ( bpp == 4 )
108                         {
109                                 // Allocate the alpha mask
110                                 uint8_t *alpha = mlt_pool_alloc( owidth * ( oheight + 1 ) );
111
112                                 // Convert the image and extract alpha
113                                 mlt_convert_rgb24a_to_yuv422( *image, owidth, oheight, owidth * 4, output, alpha );
114
115                                 mlt_properties_set_data( properties, "alpha", alpha, owidth * ( oheight + 1 ), ( mlt_destructor )mlt_pool_release, NULL );
116                         }
117                         else
118                         {
119                                 // No alpha to extract
120                                 mlt_convert_rgb24_to_yuv422( *image, owidth, oheight, owidth * 3, output );
121                         }
122                 }
123
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 );
128
129                 *image = output;
130         }
131
132         return 0;
133 }
134
135 /** Constructor for the filter.
136 */
137
138 mlt_filter filter_rescale_init( char *arg )
139 {
140         // Create a new scaler
141         mlt_filter this = mlt_factory_filter( "rescale", arg );
142
143         // If successful, then initialise it
144         if ( this != NULL )
145         {
146                 // Get the properties
147                 mlt_properties properties = mlt_filter_properties( this );
148
149                 // Set the inerpolation
150                 mlt_properties_set( properties, "interpolation", arg == NULL ? "bilinear" : arg );
151
152                 // Set the method
153                 mlt_properties_set_data( properties, "method", filter_scale, 0, NULL, NULL );
154         }
155
156         return this;
157 }
158