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"
23 #include <framework/mlt_frame.h>
29 typedef int ( *image_scaler
)( mlt_frame
this, uint8_t **image
, mlt_image_format iformat
, mlt_image_format oformat
, int iwidth
, int iheight
, int owidth
, int oheight
);
31 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
)
34 mlt_properties properties
= mlt_frame_properties( this );
36 // Get the rescaling interpolsation
37 char *interps
= mlt_properties_get( properties
, "rescale.interp" );
39 // Carry out the rescaling
40 if ( iformat
== mlt_image_yuv422
&& oformat
== mlt_image_yuv422
)
43 mlt_frame_rescale_yuv422( this, owidth
, oheight
);
46 *image
= mlt_properties_get_data( properties
, "image", NULL
);
48 else if ( iformat
== mlt_image_rgb24
|| iformat
== mlt_image_rgb24a
)
50 int bpp
= (iformat
== mlt_image_rgb24a ?
4 : 3 );
52 // Create the yuv image
53 uint8_t *output
= mlt_pool_alloc( iwidth
* ( iheight
+ 1 ) * 2 );
55 if ( strcmp( interps
, "none" ) && ( iwidth
!= owidth
|| iheight
!= oheight
) )
57 // Extract YUV422 and alpha
60 // Allocate the alpha mask
61 uint8_t *alpha
= mlt_pool_alloc( iwidth
* ( iheight
+ 1 ) );
63 // Convert the image and extract alpha
64 mlt_convert_rgb24a_to_yuv422( *image
, iwidth
, iheight
, iwidth
* 2, output
, alpha
);
66 mlt_properties_set_data( properties
, "alpha", alpha
, iwidth
* ( iheight
+ 1 ), ( mlt_destructor
)mlt_pool_release
, NULL
);
70 // No alpha to extract
71 mlt_convert_rgb24_to_yuv422( *image
, iwidth
, iheight
, iwidth
* 2, output
);
75 mlt_frame_rescale_yuv422( this, owidth
, oheight
);
78 *image
= mlt_properties_get_data( properties
, "image", NULL
);
82 // Extract YUV422 and alpha
85 // Allocate the alpha mask
86 uint8_t *alpha
= mlt_pool_alloc( owidth
* ( oheight
+ 1 ) );
88 // Convert the image and extract alpha
89 mlt_convert_rgb24a_to_yuv422( *image
, owidth
, oheight
, owidth
* 4, output
, alpha
);
91 mlt_properties_set_data( properties
, "alpha", alpha
, owidth
* ( oheight
+ 1 ), ( mlt_destructor
)mlt_pool_release
, NULL
);
95 // No alpha to extract
96 mlt_convert_rgb24_to_yuv422( *image
, owidth
, oheight
, owidth
* 3, output
);
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
);
114 static int filter_get_image( mlt_frame
this, uint8_t **image
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
116 // Get the frame properties
117 mlt_properties properties
= mlt_frame_properties( this );
119 // Get the filter from the stack
120 mlt_filter filter
= mlt_frame_pop_service( this );
122 // Get the filter properties
123 mlt_properties filter_properties
= mlt_filter_properties( filter
);
125 // Get the image scaler method
126 image_scaler scaler_method
= mlt_properties_get_data( filter_properties
, "method", NULL
);
128 // Correct Width/height if necessary
129 if ( *width
== 0 || *height
== 0 )
131 *width
= mlt_properties_get_int( properties
, "normalised_width" );
132 *height
= mlt_properties_get_int( properties
, "normalised_height" );
135 // There can be problems with small images - avoid them (by hacking - gah)
136 if ( *width
>= 2 && *height
>= 6 )
139 int iheight
= *height
;
141 int oheight
= *height
;
142 char *interps
= mlt_properties_get( properties
, "rescale.interp" );
144 // Default from the scaler if not specifed on the frame
145 if ( interps
== NULL
)
147 interps
= mlt_properties_get( mlt_filter_properties( filter
), "interpolation" );
148 mlt_properties_set( properties
, "rescale.interp", interps
);
151 // If real_width/height exist, we want that as minimum information
152 if ( mlt_properties_get_int( properties
, "real_width" ) )
154 iwidth
= mlt_properties_get_int( properties
, "real_width" );
155 iheight
= mlt_properties_get_int( properties
, "real_height" );
158 // Let the producer know what we are actually requested to obtain
159 if ( *format
== mlt_image_yuv422
&& strcmp( interps
, "none" ) )
161 mlt_properties_set_int( properties
, "rescale_width", *width
);
162 mlt_properties_set_int( properties
, "rescale_height", *height
);
166 // When no scaling is requested, revert the requested dimensions if possible
167 mlt_properties_set_int( properties
, "rescale_width", ( iwidth
/ 2 ) * 2 );
168 mlt_properties_set_int( properties
, "rescale_height", ( iheight
/ 2 ) * 2 );
171 // Get the image as requested
172 mlt_frame_get_image( this, image
, format
, &iwidth
, &iheight
, writable
);
174 // Get rescale interpretation again, in case the producer wishes to override scaling
175 interps
= mlt_properties_get( properties
, "rescale.interp" );
177 if ( *image
!= NULL
&& ( *format
!= mlt_image_yuv422
|| ( iwidth
!= owidth
|| iheight
!= oheight
) ) )
179 // If the colour space is correct and scaling is off, do nothing
180 if ( *format
== mlt_image_yuv422
&& !strcmp( interps
, "none" ) )
185 else if ( *format
== mlt_image_yuv422
)
187 // Call the local scaler
188 scaler_method( this, image
, *format
, mlt_image_yuv422
, iwidth
, iheight
, owidth
, oheight
);
192 else if ( *format
== mlt_image_rgb24
|| *format
== mlt_image_rgb24a
)
194 // Call the local scaler
195 scaler_method( this, image
, *format
, mlt_image_yuv422
, iwidth
, iheight
, owidth
, oheight
);
198 *format
= mlt_image_yuv422
;
216 // Store the requested width/height
218 int iheight
= *height
;
220 // Get the image as requested
221 mlt_frame_get_image( this, image
, format
, &iwidth
, &iheight
, writable
);
223 // Too small - for now just assign as though we got what we wanted
232 static uint8_t *producer_get_alpha_mask( mlt_frame
this )
234 // Obtain properties of frame
235 mlt_properties properties
= mlt_frame_properties( this );
237 // Return the alpha mask
238 return mlt_properties_get_data( properties
, "alpha", NULL
);
241 /** Filter processing.
244 static mlt_frame
filter_process( mlt_filter
this, mlt_frame frame
)
247 mlt_frame_push_service( frame
, this );
249 // Push the get image method
250 mlt_frame_push_service( frame
, filter_get_image
);
252 // Set alpha call back
253 frame
->get_alpha_mask
= producer_get_alpha_mask
;
258 /** Constructor for the filter.
261 mlt_filter
filter_rescale_init( char *arg
)
263 // Create a new scaler
264 mlt_filter
this = mlt_filter_new( );
266 // If successful, then initialise it
269 // Get the properties
270 mlt_properties properties
= mlt_filter_properties( this );
272 // Set the process method
273 this->process
= filter_process
;
275 // Set the inerpolation
276 mlt_properties_set( properties
, "interpolation", arg
== NULL ?
"bilinear" : arg
);
279 mlt_properties_set_data( properties
, "method", filter_scale
, 0, NULL
, NULL
);