2 * filter_luma.c -- luma filter
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@pandora.be>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library 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 GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #include <framework/mlt_filter.h>
22 #include <framework/mlt_factory.h>
23 #include <framework/mlt_frame.h>
24 #include <framework/mlt_producer.h>
25 #include <framework/mlt_transition.h>
26 #include <framework/mlt_log.h>
35 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
38 mlt_filter filter = mlt_frame_pop_service( this );
39 mlt_properties properties = MLT_FILTER_PROPERTIES( filter );
41 mlt_service_lock( MLT_FILTER_SERVICE( filter ) );
43 mlt_transition luma = mlt_properties_get_data( properties, "luma", NULL );
44 mlt_frame b_frame = mlt_properties_get_data( properties, "frame", NULL );
45 mlt_properties b_frame_props = b_frame ? MLT_FRAME_PROPERTIES( b_frame ) : NULL;
46 int out = mlt_properties_get_int( properties, "period" );
47 int cycle = mlt_properties_get_int( properties, "cycle" );
48 int duration = mlt_properties_get_int( properties, "duration" );
49 mlt_position position = mlt_filter_get_position( filter, this );
51 out = out? out + 1 : 25;
54 if ( duration < 1 || duration > out )
56 *format = mlt_image_yuv422;
58 if ( b_frame == NULL || mlt_properties_get_int( b_frame_props, "width" ) != *width || mlt_properties_get_int( b_frame_props, "height" ) != *height )
60 b_frame = mlt_frame_init( MLT_FILTER_SERVICE( filter ) );
61 mlt_properties_set_data( properties, "frame", b_frame, 0, ( mlt_destructor )mlt_frame_close, NULL );
66 char *resource = mlt_properties_get( properties, "resource" );
67 mlt_profile profile = mlt_service_profile( MLT_FILTER_SERVICE( filter ) );
68 luma = mlt_factory_transition( profile, "luma", resource );
71 mlt_properties luma_properties = MLT_TRANSITION_PROPERTIES( luma );
72 mlt_properties_set_int( luma_properties, "in", 0 );
73 mlt_properties_set_int( luma_properties, "out", duration - 1 );
74 mlt_properties_set_int( luma_properties, "reverse", 1 );
75 mlt_properties_set_data( properties, "luma", luma, 0, ( mlt_destructor )mlt_transition_close, NULL );
79 mlt_position modulo_pos = position % out;
80 mlt_log_debug( MLT_FILTER_SERVICE(filter), "pos %d mod period %d\n", position, modulo_pos );
82 ( mlt_properties_get( properties, "blur" ) != NULL ||
83 ( position >= duration && modulo_pos < duration - 1 ) ) )
85 mlt_properties luma_properties = MLT_TRANSITION_PROPERTIES( luma );
86 mlt_properties_pass( luma_properties, properties, "luma." );
87 int in = position / out * out + mlt_frame_get_position( this ) - position;
88 mlt_properties_set_int( luma_properties, "in", in );
89 mlt_properties_set_int( luma_properties, "out", in + duration - 1 );
90 mlt_transition_process( luma, this, b_frame );
93 error = mlt_frame_get_image( this, image, format, width, height, 1 );
95 // We only need a copy of the last frame in the cycle, but we could miss it
96 // with realtime frame-dropping, so we copy the last several frames of the cycle.
97 if ( error == 0 && modulo_pos > out - duration )
99 mlt_properties a_props = MLT_FRAME_PROPERTIES( this );
101 uint8_t *src = mlt_properties_get_data( a_props, "image", &size );
102 uint8_t *dst = mlt_pool_alloc( size );
106 mlt_log_debug( MLT_FILTER_SERVICE(filter), "copying frame %d\n", modulo_pos );
107 mlt_properties b_props = MLT_FRAME_PROPERTIES( b_frame );
108 memcpy( dst, src, size );
109 mlt_frame_set_image( b_frame, dst, size, mlt_pool_release );
110 mlt_properties_set_int( b_props, "width", *width );
111 mlt_properties_set_int( b_props, "height", *height );
112 mlt_properties_set_int( b_props, "format", *format );
116 mlt_service_unlock( MLT_FILTER_SERVICE( filter ) );
121 /** Filter processing.
124 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
126 // Push the filter on to the stack
127 mlt_frame_push_service( frame, this );
129 // Push the get_image on to the stack
130 mlt_frame_push_get_image( frame, filter_get_image );
135 /** Constructor for the filter.
138 mlt_filter filter_luma_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
140 mlt_filter this = mlt_filter_new( );
143 mlt_properties properties = MLT_FILTER_PROPERTIES( this );
144 this->process = filter_process;
146 mlt_properties_set( properties, "resource", arg );