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 // Get the b frame and process with composite if successful
119 if ( mlt_service_get_frame( service, &b_frame, 0 ) == 0 )
120 mlt_transition_process( composite, frame, b_frame );
123 error = mlt_frame_get_image( frame, image, format, width, height, 1 );
126 mlt_frame_close( b_frame );
130 // Get the image from the frame without running fx
131 error = mlt_frame_get_image( frame, image, format, width, height, 1 );
137 /** Filter processing.
140 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
142 // Get the properties of the frame
143 mlt_properties properties = mlt_frame_properties( frame );
145 // Get a unique name to store the frame position
146 char *name = mlt_properties_get( mlt_filter_properties( this ), "_unique_id" );
148 // Assign the current position to the name
149 mlt_properties_set_position( properties, name, mlt_frame_get_position( frame ) );
151 // Push the filter on to the stack
152 mlt_frame_push_service( frame, this );
154 // Push the get_image on to the stack
155 mlt_frame_push_get_image( frame, filter_get_image );
160 /** Constructor for the filter.
163 mlt_filter filter_watermark_init( void *arg )
165 mlt_filter this = mlt_filter_new( );
168 mlt_properties properties = mlt_filter_properties( this );
169 this->process = filter_process;
170 mlt_properties_set( properties, "factory", "fezzik" );
172 mlt_properties_set( properties, "resource", arg );