2 * filter_watermark.c -- watermark 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_watermark.h"
23 #include <framework/mlt_factory.h>
24 #include <framework/mlt_frame.h>
25 #include <framework/mlt_producer.h>
26 #include <framework/mlt_transition.h>
34 static int filter_get_image( mlt_frame frame
, uint8_t **image
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
36 // Error we will return
39 // Get the watermark filter object
40 mlt_filter
this = mlt_frame_pop_service( frame
);
42 // Get the properties of the filter
43 mlt_properties properties
= mlt_filter_properties( this );
45 // Get the producer from the filter
46 mlt_producer producer
= mlt_properties_get_data( properties
, "producer", NULL
);
48 // Get the composite from the filter
49 mlt_transition composite
= mlt_properties_get_data( properties
, "composite", NULL
);
51 // Create a composite if we don't have one
52 if ( composite
== NULL
)
54 // Create composite via the factory
55 composite
= mlt_factory_transition( "composite", NULL
);
58 if ( composite
!= NULL
)
61 mlt_properties composite_properties
= mlt_transition_properties( composite
);
63 // Pass all the composite. properties on the filter down
64 mlt_properties_pass( composite_properties
, properties
, "composite." );
66 // Register the composite for reuse/destruction
67 mlt_properties_set_data( properties
, "composite", composite
, 0, ( mlt_destructor
)mlt_transition_close
, NULL
);
71 // Create a producer if don't have one
72 if ( producer
== NULL
)
74 // Get the resource to use
75 char *resource
= mlt_properties_get( properties
, "resource" );
77 // Get the factory producer service
78 char *factory
= mlt_properties_get( properties
, "factory" );
80 // Create the producer
81 producer
= mlt_factory_producer( factory
, resource
);
84 if ( producer
!= NULL
)
86 // Get the producer properties
87 mlt_properties producer_properties
= mlt_producer_properties( producer
);
89 // Ensure that we loop
90 mlt_properties_set( producer_properties
, "eof", "loop" );
92 // Now pass all producer. properties on the filter down
93 mlt_properties_pass( producer_properties
, properties
, "producer." );
95 // Register the producer for reuse/destruction
96 mlt_properties_set_data( properties
, "producer", producer
, 0, ( mlt_destructor
)mlt_producer_close
, NULL
);
100 // Only continue if we have both producer and composite
101 if ( composite
!= NULL
&& producer
!= NULL
)
103 // Get the service of the producer
104 mlt_service service
= mlt_producer_service( producer
);
106 // We will get the 'b frame' from the producer
107 mlt_frame b_frame
= NULL
;
109 // Get the unique id of the filter (used to reacquire the producer position)
110 char *name
= mlt_properties_get( properties
, "_unique_id" );
112 // Get the original producer position
113 mlt_position position
= mlt_properties_get_position( mlt_frame_properties( frame
), name
);
115 // Make sure the producer is in the correct position
116 mlt_producer_seek( producer
, position
);
118 // Resetting position to appease the composite transition
119 mlt_frame_set_position( frame
, position
);
121 // Get the b frame and process with composite if successful
122 if ( mlt_service_get_frame( service
, &b_frame
, 0 ) == 0 )
123 mlt_transition_process( composite
, frame
, b_frame
);
126 error
= mlt_frame_get_image( frame
, image
, format
, width
, height
, 1 );
129 mlt_frame_close( b_frame
);
133 // Get the image from the frame without running fx
134 error
= mlt_frame_get_image( frame
, image
, format
, width
, height
, 1 );
140 /** Filter processing.
143 static mlt_frame
filter_process( mlt_filter
this, mlt_frame frame
)
145 // Get the properties of the frame
146 mlt_properties properties
= mlt_frame_properties( frame
);
148 // Get a unique name to store the frame position
149 char *name
= mlt_properties_get( mlt_filter_properties( this ), "_unique_id" );
151 // Assign the current position to the name
152 mlt_properties_set_position( properties
, name
, mlt_frame_get_position( frame
) );
154 // Push the filter on to the stack
155 mlt_frame_push_service( frame
, this );
157 // Push the get_image on to the stack
158 mlt_frame_push_get_image( frame
, filter_get_image
);
163 /** Constructor for the filter.
166 mlt_filter
filter_watermark_init( void *arg
)
168 mlt_filter
this = mlt_filter_new( );
171 mlt_properties properties
= mlt_filter_properties( this );
172 this->process
= filter_process
;
173 mlt_properties_set( properties
, "factory", "fezzik" );
175 mlt_properties_set( properties
, "resource", arg
);