2 * mlt_filter.c -- abstraction for all filter services
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.
23 #include "mlt_filter.h"
24 #include "mlt_frame.h"
30 static int filter_get_frame( mlt_service
this, mlt_frame_ptr frame
, int index
);
32 /** Constructor method.
35 int mlt_filter_init( mlt_filter
this, void *child
)
37 mlt_service service
= &this->parent
;
38 memset( this, 0, sizeof( struct mlt_filter_s
) );
40 if ( mlt_service_init( service
, this ) == 0 )
42 mlt_properties properties
= MLT_SERVICE_PROPERTIES( service
);
44 // Override the get_frame method
45 service
->get_frame
= filter_get_frame
;
47 // Define the destructor
48 service
->close
= ( mlt_destructor
)mlt_filter_close
;
49 service
->close_object
= this;
51 // Default in, out, track properties
52 mlt_properties_set_position( properties
, "in", 0 );
53 mlt_properties_set_position( properties
, "out", 0 );
54 mlt_properties_set_int( properties
, "track", 0 );
61 /** Create a new filter.
64 mlt_filter
mlt_filter_new( )
66 mlt_filter
this = calloc( 1, sizeof( struct mlt_filter_s
) );
68 mlt_filter_init( this, NULL
);
72 /** Get the service associated to this filter
75 mlt_service
mlt_filter_service( mlt_filter
this )
77 return this != NULL ?
&this->parent
: NULL
;
80 /** Get the properties associated to this filter.
83 mlt_properties
mlt_filter_properties( mlt_filter
this )
85 return MLT_SERVICE_PROPERTIES( MLT_FILTER_SERVICE( this ) );
88 /** Connect this filter to a producers track. Note that a filter only operates
89 on a single track, and by default it operates on the entirety of that track.
92 int mlt_filter_connect( mlt_filter
this, mlt_service producer
, int index
)
94 int ret
= mlt_service_connect_producer( &this->parent
, producer
, index
);
96 // If the connection was successful, grab the producer, track and reset in/out
99 mlt_properties properties
= MLT_SERVICE_PROPERTIES( &this->parent
);
100 mlt_properties_set_position( properties
, "in", 0 );
101 mlt_properties_set_position( properties
, "out", 0 );
102 mlt_properties_set_int( properties
, "track", index
);
108 /** Tune the in/out points.
111 void mlt_filter_set_in_and_out( mlt_filter
this, mlt_position in
, mlt_position out
)
113 mlt_properties properties
= MLT_SERVICE_PROPERTIES( &this->parent
);
114 mlt_properties_set_position( properties
, "in", in
);
115 mlt_properties_set_position( properties
, "out", out
);
118 /** Return the track that this filter is operating on.
121 int mlt_filter_get_track( mlt_filter
this )
123 mlt_properties properties
= MLT_SERVICE_PROPERTIES( &this->parent
);
124 return mlt_properties_get_int( properties
, "track" );
127 /** Get the in point.
130 mlt_position
mlt_filter_get_in( mlt_filter
this )
132 mlt_properties properties
= MLT_SERVICE_PROPERTIES( &this->parent
);
133 return mlt_properties_get_position( properties
, "in" );
136 /** Get the out point.
139 mlt_position
mlt_filter_get_out( mlt_filter
this )
141 mlt_properties properties
= MLT_SERVICE_PROPERTIES( &this->parent
);
142 return mlt_properties_get_position( properties
, "out" );
145 /** Process the frame.
148 mlt_frame
mlt_filter_process( mlt_filter
this, mlt_frame frame
)
150 int disable
= mlt_properties_get_int( MLT_FILTER_PROPERTIES( this ), "disable" );
151 if ( disable
|| this->process
== NULL
)
154 return this->process( this, frame
);
157 /** Get a frame from this filter.
160 static int filter_get_frame( mlt_service service
, mlt_frame_ptr frame
, int index
)
162 mlt_filter
this = service
->child
;
164 // Get coords in/out/track
165 int track
= mlt_filter_get_track( this );
166 int in
= mlt_filter_get_in( this );
167 int out
= mlt_filter_get_out( this );
169 // Get the producer this is connected to
170 mlt_service producer
= mlt_service_producer( &this->parent
);
172 // If the frame request is for this filters track, we need to process it
173 if ( index
== track
|| track
== -1 )
175 int ret
= mlt_service_get_frame( producer
, frame
, index
);
178 mlt_position position
= mlt_frame_get_position( *frame
);
179 if ( position
>= in
&& ( out
== 0 || position
<= out
) )
180 *frame
= mlt_filter_process( this, *frame
);
185 *frame
= mlt_frame_init( );
191 return mlt_service_get_frame( producer
, frame
, index
);
195 /** Close the filter.
198 void mlt_filter_close( mlt_filter
this )
200 if ( this != NULL
&& mlt_properties_dec_ref( MLT_FILTER_PROPERTIES( this ) ) <= 0 )
202 if ( this->close
!= NULL
)
208 this->parent
.close
= NULL
;
209 mlt_service_close( &this->parent
);