2 * filter_freeze.c -- simple frame freezing filter
3 * Copyright (C) 2007 Jean-Baptiste Mardelle <jb@kdenlive.org>
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2.1 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 #include <framework/mlt_filter.h>
21 #include <framework/mlt_frame.h>
22 #include <framework/mlt_producer.h>
23 #include <framework/mlt_service.h>
24 #include <framework/mlt_factory.h>
25 #include <framework/mlt_property.h>
27 static int filter_get_image( mlt_frame
this, uint8_t **image
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
30 mlt_filter filter
= mlt_frame_pop_service( this );
31 mlt_properties properties
= MLT_FILTER_PROPERTIES( filter
);
33 mlt_frame freeze_frame
= NULL
;;
34 int freeze_before
= mlt_properties_get_int( properties
, "freeze_before" );
35 int freeze_after
= mlt_properties_get_int( properties
, "freeze_after" );
36 mlt_position pos
= mlt_properties_get_position( properties
, "frame" );
37 mlt_position currentpos
= mlt_properties_get_position( properties
, "_seek_frame" );
40 if (freeze_before
== 0 && freeze_after
== 0) {
42 } else if (freeze_before
!= 0 && pos
> currentpos
) {
44 } else if (freeze_after
!= 0 && pos
< currentpos
) {
49 freeze_frame
= mlt_properties_get_data( properties
, "freeze_frame", NULL
);
51 if( freeze_frame
== NULL
|| mlt_properties_get_position( properties
, "_frame" ) != pos
)
53 // freeze_frame has not been fetched yet, so fetch it and cache it.
54 mlt_producer producer
= mlt_frame_get_original_producer(this);
55 mlt_producer_seek( producer
, pos
);
58 mlt_service_get_frame( mlt_producer_service(producer
), &freeze_frame
, 0 );
60 mlt_properties props
= MLT_FRAME_PROPERTIES( this );
61 mlt_properties freeze_properties
= MLT_FRAME_PROPERTIES( freeze_frame
);
62 mlt_properties_set_double( freeze_properties
, "consumer_aspect_ratio", mlt_properties_get_double( props
, "consumer_aspect_ratio" ) );
63 mlt_properties_set( freeze_properties
, "rescale.interp", mlt_properties_get( props
, "rescale.interp" ) );
64 mlt_properties_set_double( freeze_properties
, "aspect_ratio", mlt_frame_get_aspect_ratio( this ) );
65 mlt_properties_set_int( freeze_properties
, "progressive", mlt_properties_get_int( props
, "progressive" ) );
67 mlt_properties_set_data( properties
, "freeze_frame", freeze_frame
, 0, NULL
, NULL
);
68 mlt_properties_set_position( properties
, "_frame", pos
);
70 int error
= mlt_frame_get_image( freeze_frame
, image
, format
, width
, height
, 1 );
74 int error
= mlt_frame_get_image( this, image
, format
, width
, height
, 1 );
78 /** Filter processing.
81 static mlt_frame
filter_process( mlt_filter
this, mlt_frame frame
)
84 // Push the filter on to the stack
85 mlt_frame_push_service( frame
, this );
87 // Determine the time position of this frame
88 mlt_properties_set_position( MLT_FILTER_PROPERTIES( this ), "_seek_frame", mlt_frame_get_position( frame
) - mlt_filter_get_in( this ) );
90 // Push the frame filter
91 mlt_frame_push_get_image( frame
, filter_get_image
);
96 /** Constructor for the filter.
99 mlt_filter
filter_freeze_init( mlt_profile profile
, mlt_service_type type
, const char *id
, char *arg
)
101 mlt_filter
this = mlt_filter_new( );
104 this->process
= filter_process
;
105 // Set the frame which will be chosen for freeze
106 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "frame", "0" );
108 // If freeze_after = 1, only frames after the "frame" value will be frozen
109 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "freeze_after", "0" );
111 // If freeze_before = 1, only frames after the "frame" value will be frozen
112 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "freeze_before", "0" );