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 library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library 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 GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include <framework/mlt_filter.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 *format, 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 || strcmp( interps, "bicubic" ) == 0 )
48 interp = PIXOPS_INTERP_HYPER;
50 // Carry out the rescaling
53 case mlt_image_yuv422:
55 // Create the output image
56 uint8_t *output = mlt_pool_alloc( owidth * ( oheight + 1 ) * 2 );
59 int istride = iwidth * 2;
60 int ostride = owidth * 2;
62 yuv422_scale_simple( output, owidth, oheight, ostride, *image, iwidth, iheight, istride, interp );
64 // Now update the frame
65 mlt_frame_set_image( this, output, owidth * ( oheight + 1 ) * 2, mlt_pool_release );
72 case mlt_image_rgb24a:
73 case mlt_image_opengl:
75 int bpp = ( *format == mlt_image_rgb24 ? 3 : 4 );
77 // Create the output image
78 uint8_t *output = mlt_pool_alloc( owidth * ( oheight + 1 ) * bpp );
80 if ( strcmp( interps, "none" ) && ( iwidth != owidth || iheight != oheight ) )
82 GdkPixbuf *pixbuf = gdk_pixbuf_new_from_data( *image, GDK_COLORSPACE_RGB,
83 ( *format == mlt_image_rgb24a || *format == mlt_image_opengl ), 8, iwidth, iheight,
84 iwidth * bpp, NULL, NULL );
85 GdkPixbuf *scaled = gdk_pixbuf_scale_simple( pixbuf, owidth, oheight, interp );
86 g_object_unref( pixbuf );
88 int src_stride = gdk_pixbuf_get_rowstride( scaled );
89 int dst_stride = owidth * bpp;
90 if ( src_stride != dst_stride )
93 uint8_t *src = gdk_pixbuf_get_pixels( scaled );
94 uint8_t *dst = output;
97 memcpy( dst, src, dst_stride );
104 memcpy( output, gdk_pixbuf_get_pixels( scaled ), owidth * oheight * bpp );
107 g_object_unref( scaled );
109 // Now update the frame
110 mlt_frame_set_image( this, output, owidth * ( oheight + 1 ) * bpp, mlt_pool_release );
124 /** Constructor for the filter.
127 mlt_filter filter_rescale_init( mlt_profile profile, char *arg )
129 // Create a new scaler
130 mlt_filter this = mlt_factory_filter( profile, "rescale", arg );
132 // If successful, then initialise it
135 // Get the properties
136 mlt_properties properties = MLT_FILTER_PROPERTIES( this );
138 // Set the inerpolation
139 mlt_properties_set( properties, "interpolation", arg == NULL ? "bilinear" : arg );
142 mlt_properties_set_data( properties, "method", filter_scale, 0, NULL, NULL );