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 )
41 if ( *width < 2 || *height < 6 )
44 mlt_properties properties = mlt_frame_properties( this );
46 int iheight = *height;
48 int oheight = *height;
49 uint8_t *input = NULL;
50 char *interps = mlt_properties_get( properties, "rescale.interp" );
51 int interp = PIXOPS_INTERP_BILINEAR;
53 // If real_width/height exist, we want that as minimum information
54 if ( mlt_properties_get_int( properties, "real_width" ) )
56 iwidth = mlt_properties_get_int( properties, "real_width" );
57 iheight = mlt_properties_get_int( properties, "real_height" );
60 // Let the producer know what we are actually requested to obtain
61 if ( *format == mlt_image_yuv422 && strcmp( interps, "none" ) )
63 mlt_properties_set_int( properties, "rescale_width", *width );
64 mlt_properties_set_int( properties, "rescale_height", *height );
68 // When no scaling is requested, revert the requested dimensions if possible
69 mlt_properties_set_int( properties, "rescale_width", ( iwidth / 2 ) * 2 );
70 mlt_properties_set_int( properties, "rescale_height", ( iheight / 2 ) * 2 );
73 // Get the image as requested
74 mlt_frame_get_image( this, &input, format, &iwidth, &iheight, writable );
76 // Get rescale interpretation again, in case the producer wishes to override scaling
77 interps = mlt_properties_get( properties, "rescale.interp" );
79 if ( strcmp( interps, "nearest" ) == 0 )
80 interp = PIXOPS_INTERP_NEAREST;
81 else if ( strcmp( interps, "tiles" ) == 0 )
82 interp = PIXOPS_INTERP_TILES;
83 else if ( strcmp( interps, "hyper" ) == 0 )
84 interp = PIXOPS_INTERP_HYPER;
88 // If width and height are correct, don't do anything
89 if ( *format == mlt_image_yuv422 && strcmp( interps, "none" ) && ( iwidth != owidth || iheight != oheight ) )
91 // Create the output image
92 uint8_t *output = mlt_pool_alloc( owidth * ( oheight + 1 ) * 2 );
95 int istride = iwidth * 2;
96 int ostride = owidth * 2;
98 yuv422_scale_simple( output, owidth, oheight, ostride, input, iwidth, iheight, istride, interp );
100 // Now update the frame
101 mlt_properties_set_data( properties, "image", output, owidth * ( oheight + 1 ) * 2, ( mlt_destructor )mlt_pool_release, NULL );
102 mlt_properties_set_int( properties, "width", owidth );
103 mlt_properties_set_int( properties, "height", oheight );
108 else if ( *format == mlt_image_yuv422 && !strcmp( interps, "none" ) )
115 else if ( *format == mlt_image_rgb24 || *format == mlt_image_rgb24a )
117 int bpp = (*format == mlt_image_rgb24a ? 4 : 3 );
119 // Create the yuv image
120 uint8_t *output = mlt_pool_alloc( owidth * ( oheight + 1 ) * 2 );
122 if ( strcmp( interps, "none" ) && ( iwidth != owidth || iheight != oheight ) )
124 GdkPixbuf *pixbuf = gdk_pixbuf_new_from_data( input, GDK_COLORSPACE_RGB,
125 ( *format == mlt_image_rgb24a ), 8, iwidth, iheight,
126 iwidth * bpp, NULL, NULL );
128 GdkPixbuf *scaled = gdk_pixbuf_scale_simple( pixbuf, owidth, oheight, interp );
129 g_object_unref( pixbuf );
131 // Extract YUV422 and alpha
134 // Allocate the alpha mask
135 uint8_t *alpha = mlt_pool_alloc( owidth * ( oheight + 1 ) );
137 // Convert the image and extract alpha
138 mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( scaled ),
140 gdk_pixbuf_get_rowstride( scaled ),
143 mlt_properties_set_data( properties, "alpha", alpha, owidth * ( oheight + 1 ), ( mlt_destructor )mlt_pool_release, NULL );
147 // No alpha to extract
148 mlt_convert_rgb24_to_yuv422( gdk_pixbuf_get_pixels( scaled ),
150 gdk_pixbuf_get_rowstride( scaled ),
153 g_object_unref( scaled );
157 // Extract YUV422 and alpha
160 // Allocate the alpha mask
161 uint8_t *alpha = mlt_pool_alloc( owidth * ( oheight + 1 ) );
163 // Convert the image and extract alpha
164 mlt_convert_rgb24a_to_yuv422( input,
169 mlt_properties_set_data( properties, "alpha", alpha, owidth * ( oheight + 1 ), ( mlt_destructor )mlt_pool_release, NULL );
173 // No alpha to extract
174 mlt_convert_rgb24_to_yuv422( input,
181 // Now update the frame
182 mlt_properties_set_data( properties, "image", output, owidth * ( oheight + 1 ) * 2, ( mlt_destructor )mlt_pool_release, NULL );
183 mlt_properties_set_int( properties, "width", owidth );
184 mlt_properties_set_int( properties, "height", oheight );
187 *format = mlt_image_yuv422;
201 static uint8_t *producer_get_alpha_mask( mlt_frame this )
203 // Obtain properties of frame
204 mlt_properties properties = mlt_frame_properties( this );
206 // Return the alpha mask
207 return mlt_properties_get_data( properties, "alpha", NULL );
210 /** Filter processing.
213 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
215 mlt_frame_push_get_image( frame, filter_get_image );
216 mlt_properties_set( mlt_frame_properties( frame ), "rescale.interp",
217 mlt_properties_get( mlt_filter_properties( this ), "interpolation" ) );
219 // Set alpha call back
220 frame->get_alpha_mask = producer_get_alpha_mask;
224 /** Constructor for the filter.
227 mlt_filter filter_rescale_init( char *arg )
229 mlt_filter this = mlt_filter_new( );
232 this->process = filter_process;
233 mlt_properties_set( mlt_filter_properties( this ), "interpolation", arg == NULL ? "bilinear" : arg );