2 * filter_region.c -- region filter
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@pandora.be>
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_region.h"
22 #include "transition_composite.h"
24 #include <framework/mlt.h>
30 static int create_instance( mlt_filter
this, char *name
, char *value
, int count
)
32 // Return from this function
35 // Duplicate the value
36 char *type
= strdup( value
);
38 // Pointer to filter argument
39 char *arg
= type
== NULL ? NULL
: strchr( type
, ':' );
41 // New filter being created
42 mlt_filter filter
= NULL
;
44 // Cleanup type and arg
49 filter
= mlt_factory_filter( type
, arg
);
51 // If we have a filter, then initialise and store it
55 mlt_properties properties
= mlt_filter_properties( this );
57 // String to hold the property name
60 // String to hold the passdown key
64 sprintf( id
, "_filter_%d", count
);
67 sprintf( key
, "%s.", name
);
69 // Just in case, let's assume that the filter here has a composite
70 mlt_properties_set( mlt_filter_properties( filter
), "composite.start", "0%,0%:100%x100%" );
71 mlt_properties_set( mlt_filter_properties( filter
), "composite.fill", "true" );
73 // Pass all the key properties on the filter down
74 mlt_properties_pass( mlt_filter_properties( filter
), properties
, key
);
76 // Ensure that filter is assigned
77 mlt_properties_set_data( properties
, id
, filter
, 0, ( mlt_destructor
)mlt_filter_close
, NULL
);
81 // Indicate that an error has occurred
88 // Return error condition
92 static uint8_t *filter_get_alpha_mask( mlt_frame
this )
94 // Obtain properties of frame
95 mlt_properties properties
= mlt_frame_properties( this );
97 // Return the alpha mask
98 return mlt_properties_get_data( properties
, "alpha", NULL
);
104 static int filter_get_image( mlt_frame frame
, uint8_t **image
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
106 // Error we will return
109 // Get the watermark filter object
110 mlt_filter
this = mlt_frame_pop_service( frame
);
112 // Get the properties of the filter
113 mlt_properties properties
= mlt_filter_properties( this );
115 // Get the composite from the filter
116 mlt_transition composite
= mlt_properties_get_data( properties
, "composite", NULL
);
118 // Look for the first filter
119 mlt_filter filter
= mlt_properties_get_data( properties
, "_filter_0", NULL
);
121 // Get the unique id of the filter (used to reacquire the producer position)
122 char *name
= mlt_properties_get( properties
, "_unique_id" );
124 // Get the original producer position
125 mlt_position position
= mlt_properties_get_position( mlt_frame_properties( frame
), name
);
127 // Create a composite if we don't have one
128 if ( composite
== NULL
)
130 // Create composite via the factory
131 composite
= mlt_factory_transition( "composite", NULL
);
134 if ( composite
!= NULL
)
136 // Get the properties
137 mlt_properties composite_properties
= mlt_transition_properties( composite
);
139 // We want to ensure that we don't get a wobble...
140 mlt_properties_set( composite_properties
, "distort", "true" );
141 mlt_properties_set( composite_properties
, "progressive", "1" );
143 // Pass all the composite. properties on the filter down
144 mlt_properties_pass( composite_properties
, properties
, "composite." );
146 // Register the composite for reuse/destruction
147 mlt_properties_set_data( properties
, "composite", composite
, 0, ( mlt_destructor
)mlt_transition_close
, NULL
);
152 if ( filter
== NULL
)
157 // Number of filters created
160 // Loop for all properties
161 for ( i
= 0; i
< mlt_properties_count( properties
); i
++ )
163 // Get the name of this property
164 char *name
= mlt_properties_get_name( properties
, i
);
166 // If the name does not contain a . and matches filter
167 if ( strchr( name
, '.' ) == NULL
&& !strncmp( name
, "filter", 6 ) )
169 // Get the filter constructor
170 char *value
= mlt_properties_get_value( properties
, i
);
172 // Create an instance
173 if ( create_instance( this, name
, value
, count
) == 0 )
180 error
= mlt_frame_get_image( frame
, image
, format
, width
, height
, 1 );
182 // Only continue if we have both filter and composite
183 if ( composite
!= NULL
&& filter
!= NULL
)
185 // Get the resource of this filter (could be a shape [rectangle/circle] or an alpha provider of choice
186 char *resource
= mlt_properties_get( properties
, "resource" );
188 // String to hold the filter to query on
191 // Index to hold the count
194 // We will get the 'b frame' from the composite
195 mlt_frame b_frame
= composite_copy_region( composite
, frame
, position
);
197 // Make sure the filter is in the correct position
198 while ( filter
!= NULL
)
201 mlt_filter_process( filter
, b_frame
);
203 // Generate the key for the next
204 sprintf( id
, "_filter_%d", ++ i
);
206 // Get the next filter
207 filter
= mlt_properties_get_data( properties
, id
, NULL
);
210 // Hmm - this is probably going to go wrong....
211 mlt_frame_set_position( frame
, position
);
213 // Get the b frame and process with composite if successful
214 mlt_transition_process( composite
, frame
, b_frame
);
216 // If we have a shape producer copy the alpha mask from the shape frame to the b_frame
217 if ( strcmp( resource
, "rectangle" ) != 0 )
219 // Get the producer from the filter
220 mlt_producer producer
= mlt_properties_get_data( properties
, "producer", NULL
);
222 // If We have no producer then create one
223 if ( producer
== NULL
)
225 // Get the factory producer service
226 char *factory
= mlt_properties_get( properties
, "factory" );
228 // Special case circle resource
229 if ( strcmp( resource
, "circle" ) == 0 )
231 // Special case to ensure that fezzik produces a pixbuf with a NULL constructor
234 // Specify the svg circle
235 mlt_properties_set( properties
, "producer.resource", "<svg width='100' height='100'><circle cx='50' cy='50' r='50' fill='black'/></svg>" );
238 // Create the producer
239 producer
= mlt_factory_producer( factory
, resource
);
242 if ( producer
!= NULL
)
244 // Get the producer properties
245 mlt_properties producer_properties
= mlt_producer_properties( producer
);
247 // Ensure that we loop
248 mlt_properties_set( producer_properties
, "eof", "loop" );
250 // Now pass all producer. properties on the filter down
251 mlt_properties_pass( producer_properties
, properties
, "producer." );
253 // Register the producer for reuse/destruction
254 mlt_properties_set_data( properties
, "producer", producer
, 0, ( mlt_destructor
)mlt_producer_close
, NULL
);
258 // Now use the shape producer
259 if ( producer
!= NULL
)
261 // We will get the alpha frame from the producer
262 mlt_frame shape_frame
= NULL
;
264 // Make sure the producer is in the correct position
265 mlt_producer_seek( producer
, position
);
267 // Get the shape frame
268 if ( mlt_service_get_frame( mlt_producer_service( producer
), &shape_frame
, 0 ) == 0 )
270 int region_width
= mlt_properties_get_int( mlt_frame_properties( b_frame
), "width" );
271 int region_height
= mlt_properties_get_int( mlt_frame_properties( b_frame
), "height" );
273 // Get the shape image to trigger alpha creation
274 mlt_properties_set( mlt_frame_properties( shape_frame
), "distort", "true" );
275 error
= mlt_frame_get_image( shape_frame
, image
, format
, ®ion_width
, ®ion_height
, 1 );
277 // Only override any existing b_frame alpha if the shape has an alpha
278 if ( mlt_frame_get_alpha_mask( shape_frame
) != NULL
)
280 // Set the b_frame alpha from the shape frame
281 mlt_properties_set_data( mlt_frame_properties( b_frame
), "alpha", mlt_frame_get_alpha_mask( shape_frame
), 0 , NULL
, NULL
);
282 b_frame
->get_alpha_mask
= filter_get_alpha_mask
;
285 // Ensure that the shape frame will be closed
286 mlt_properties_set_data( mlt_frame_properties( b_frame
), "shape_frame", shape_frame
, 0, ( mlt_destructor
)mlt_frame_close
, NULL
);
292 error
= mlt_frame_get_image( frame
, image
, format
, width
, height
, 0 );
295 mlt_frame_close( b_frame
);
301 /** Filter processing.
304 static mlt_frame
filter_process( mlt_filter
this, mlt_frame frame
)
306 // Get the properties of the frame
307 mlt_properties properties
= mlt_frame_properties( frame
);
309 // Get a unique name to store the frame position
310 char *name
= mlt_properties_get( mlt_filter_properties( this ), "_unique_id" );
312 // Assign the current position to the name
313 mlt_properties_set_position( properties
, name
, mlt_frame_get_position( frame
) );
315 // Push the filter on to the frame
316 mlt_frame_push_service( frame
, this );
318 // Push the filter method
319 mlt_frame_push_get_image( frame
, filter_get_image
);
325 /** Constructor for the filter.
328 mlt_filter
filter_region_init( void *arg
)
330 // Create a new filter
331 mlt_filter
this = mlt_filter_new( );
333 // Further initialisation
336 // Get the properties from the filter
337 mlt_properties properties
= mlt_filter_properties( this );
339 // Assign the filter process method
340 this->process
= filter_process
;
342 mlt_properties_set( properties
, "factory", "fezzik" );
344 // Resource defines the shape of the region
345 mlt_properties_set( properties
, "resource", arg
== NULL ?
"rectangle" : arg
);