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[mlt] / src / modules / kdenlive / filter_freeze.c
1 /*
2  * filter_freeze.c -- simple frame freezing filter
3  * Copyright (C) 2007 Jean-Baptiste Mardelle <jb@kdenlive.org>
4  *
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.
9  *
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.
14  *
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
18  */
19
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>
26
27 #include <stdio.h>
28 #include <string.h>
29
30 static int filter_get_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
31 {
32         // Get the image
33         mlt_filter filter = mlt_frame_pop_service( frame );
34         mlt_properties properties = MLT_FILTER_PROPERTIES( filter );
35         mlt_properties props = MLT_FRAME_PROPERTIES( frame );
36
37         mlt_frame freeze_frame = NULL;;
38         int freeze_before = mlt_properties_get_int( properties, "freeze_before" );
39         int freeze_after = mlt_properties_get_int( properties, "freeze_after" );
40         mlt_position pos = mlt_properties_get_position( properties, "frame" );
41         mlt_position currentpos = mlt_filter_get_position( filter, frame );
42
43         int do_freeze = 0;
44         if (freeze_before == 0 && freeze_after == 0) {
45                 do_freeze = 1;
46         } else if (freeze_before != 0 && pos > currentpos) {
47                 do_freeze = 1;
48         } else if (freeze_after != 0 && pos < currentpos) {
49                 do_freeze = 1;
50         }
51
52         if (do_freeze == 1) {
53                 mlt_service_lock( MLT_FILTER_SERVICE( filter ) );
54                 freeze_frame = mlt_properties_get_data( properties, "freeze_frame", NULL );
55                 if ( !freeze_frame || mlt_properties_get_position( properties, "_frame" ) != pos )
56                 {
57                         // freeze_frame has not been fetched yet or is not useful, so fetch it and cache it.
58                         mlt_producer producer = mlt_frame_get_original_producer(frame);
59
60                         // If requested freeze frame is out of the cutted producer, get parent
61                         if ( pos < mlt_producer_get_in( producer ) || pos > mlt_producer_get_out( producer ) )
62                         {
63                                 producer = mlt_producer_cut_parent( producer );
64                         }
65                         mlt_producer_seek( producer, pos );
66
67                         // Get the frame
68                         mlt_service_get_frame( mlt_producer_service(producer), &freeze_frame, 0 );
69
70                         mlt_properties freeze_properties = MLT_FRAME_PROPERTIES( freeze_frame );
71                         mlt_properties_set_double( freeze_properties, "consumer_aspect_ratio", mlt_properties_get_double( props, "consumer_aspect_ratio" ) );
72                         mlt_properties_set( freeze_properties, "rescale.interp", mlt_properties_get( props, "rescale.interp" ) );
73                         mlt_properties_set_double( freeze_properties, "aspect_ratio", mlt_frame_get_aspect_ratio( frame ) );
74                         mlt_properties_set_int( freeze_properties, "progressive", mlt_properties_get_int( props, "progressive" ) );
75                         mlt_properties_set_int( freeze_properties, "consumer_deinterlace", mlt_properties_get_int( props, "consumer_deinterlace" ) || mlt_properties_get_int( properties, "deinterlace" ) );
76                         mlt_properties_set_data( properties, "freeze_frame", freeze_frame, 0, ( mlt_destructor )mlt_frame_close, NULL );
77                         mlt_properties_set_position( properties, "_frame", pos );
78                 }
79                 mlt_service_unlock( MLT_FILTER_SERVICE( filter ) );
80
81                 // Get frozen image
82                 uint8_t *buffer = NULL;
83                 int error = mlt_frame_get_image( freeze_frame, &buffer, format, width, height, 1 );
84
85                 // Copy it to current frame
86                 int size = mlt_image_format_size( *format, *width, *height, NULL );
87                 uint8_t *image_copy = mlt_pool_alloc( size );
88                 memcpy( image_copy, buffer, size );
89                 *image = image_copy;
90                 mlt_frame_set_image( frame, *image, size, mlt_pool_release );
91
92                 uint8_t *alpha_buffer = mlt_frame_get_alpha_mask( freeze_frame );
93                 int alphasize = *width * *height;
94                 uint8_t *alpha_copy = mlt_pool_alloc( alphasize );
95                 memcpy( alpha_copy, alpha_buffer, alphasize );
96                 mlt_frame_set_alpha( frame, alpha_copy, alphasize, mlt_pool_release );
97
98                 return error;
99         }
100
101         int error = mlt_frame_get_image( frame, image, format, width, height, 1 );
102         return error;
103 }
104
105 /** Filter processing.
106 */
107
108 static mlt_frame filter_process( mlt_filter filter, mlt_frame frame )
109 {
110
111         // Push the filter on to the stack
112         mlt_frame_push_service( frame, filter );
113
114         // Push the frame filter
115         mlt_frame_push_get_image( frame, filter_get_image );
116
117         return frame;
118 }
119
120 /** Constructor for the filter.
121 */
122
123 mlt_filter filter_freeze_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
124 {
125         mlt_filter filter = mlt_filter_new( );
126         if ( filter != NULL )
127         {
128                 filter->process = filter_process;
129                 // Set the frame which will be chosen for freeze
130                 mlt_properties_set( MLT_FILTER_PROPERTIES( filter ), "frame", "0" );
131
132                 // If freeze_after = 1, only frames after the "frame" value will be frozen
133                 mlt_properties_set( MLT_FILTER_PROPERTIES( filter ), "freeze_after", "0" );
134
135                 // If freeze_before = 1, only frames before the "frame" value will be frozen
136                 mlt_properties_set( MLT_FILTER_PROPERTIES( filter ), "freeze_before", "0" );
137         }
138         return filter;
139 }
140
141
142