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>
30 static int filter_get_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
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 );
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 );
44 if (freeze_before == 0 && freeze_after == 0) {
46 } else if (freeze_before != 0 && pos > currentpos) {
48 } else if (freeze_after != 0 && pos < currentpos) {
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 )
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);
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 ) )
63 producer = mlt_producer_cut_parent( producer );
65 mlt_producer_seek( producer, pos );
68 mlt_service_get_frame( mlt_producer_service(producer), &freeze_frame, 0 );
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 );
79 mlt_service_unlock( MLT_FILTER_SERVICE( filter ) );
82 uint8_t *buffer = NULL;
83 int error = mlt_frame_get_image( freeze_frame, &buffer, format, width, height, 1 );
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 );
90 mlt_frame_set_image( frame, *image, size, mlt_pool_release );
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 );
101 int error = mlt_frame_get_image( frame, image, format, width, height, 1 );
105 /** Filter processing.
108 static mlt_frame filter_process( mlt_filter filter, mlt_frame frame )
111 // Push the filter on to the stack
112 mlt_frame_push_service( frame, filter );
114 // Push the frame filter
115 mlt_frame_push_get_image( frame, filter_get_image );
120 /** Constructor for the filter.
123 mlt_filter filter_freeze_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
125 mlt_filter filter = mlt_filter_new( );
126 if ( filter != NULL )
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" );
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" );
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" );